electromagnetic separation

electromagnetic separation

Starting with a mixture of any of the above minerals it may be determined whether or not they can be separated byhigh tension, magnetic, or gravity methods and whether any one, or a combination of Electromagnetic Separation methods is required. If the minerals appear in different columns they may be separated by high tension and/or magnetic methods alone. Two or more minerals appearing in the same column can be separated by gravity concentration if they have sufficient difference in gravity (usually a difference of approximately I.O).

It should be noted that grain shape and/or size may alter separation characteristics. This is sometimes a detriment and other times useful. As an example, mica and quartz may in many cases be separated by high tension due to their grain shape.

Minerals behaviour characteristics shown are from tests made in our laboratories rather than theoretical. Mineral characteristics and behaviours sometimes vary from different deposits. The behaviour of minerals not shown can usually be predicted by the behaviour of similar minerals in the belowtable.

Magnets of the suspended or magnetic pulley type are often advisable for use with continuous pilot test plants as the occurrence of such foreign materials as tramp iron are not unusual in ore being testedon a large scale. The use of magnets will frequently prevent otherwise expensive and troublesome breakage in the crusher or damage to crushing rolls, with resultant shutdown and loss of testing time.

The (Suspended Type) Laboratory Magnet is usuallyplaced above the ore conveyor preceding the jaw crusher. Width of conveyor belt, depth of ore being conveyed and average percent of foreign material to be eliminated determine the size of magnet required. This type magnet isfurnished either circular or rectangular.

The high intensity (Pulley Type) Laboratory Magnet is one of the most practical, satisfactory, and economical magnets in use today. Used as the head pulley of a conveyor, the shaft of the magnetic pulley can very often be made to correspond with the shaft of the original pulley. It is only necessary then to place the magnetic pulley into the existing bearings. Magnetic pulleys are wound for either 110 or 220 volts and are furnished for direct current only. Rectifiers are available to enable use of alternating current. Let us make recommendations for your continuous laboratory or pilot test plant.

The Alnico Horseshoe Laboratory Magnet is a small extremely powerful hand magnet. It is an alloy of aluminum, nickel and cobalt, and is many times stronger than the ordinary horseshoe magnet. It is extremely resistant to demagnetization and is affected only slightly by shock or temperatures as high as 1200F. This magnet provides an invaluable tool for the assayer, mineralogist, andtest plant operator. Minerals that are even moderately magnetic may be separated from non-magnetic material with this magnet and it is small and light enough to carry about in your pocket.

The Dings (Rowand-Wether- ill)Magnet Separator (CrossBelt Type) is a super-highintensity machine for feebly magnetic materials. It finds its principal application onfinely divided materials which have a tendency to adhere to rolls and on minerals of similar magnetic susceptibilitywhere clean cut separations of a series of magnetic products are desired. Results obtained with the laboratory model determine the application of the commercial unit to a particular problem. The main belt travels between the poles of two horseshoe magnets wherethe magnetic particles are attracted upward to cross belts which carry them to the side beyond the magnetic influence at which point they discharge. The intensities of the magnets may be varied by rheostat control and the gaps betweenmagnets and main belt are adjustable to requirements.

The Dings-Crockett (Wet Type) Submerged Belt Separator is designed for wet separation and is widely used in the concentration of magnetite and other strongly magnetic materials. It gives an amazingly clean cut separation of tailings, middlings and concentrates, effecting magnetic recoveries averaging over 99%. Standard accessory equipment consists of a wide range rheostat and corresponding ammeter for adjusting magnet field intensities.

The Dings-Davis Laboratory Magnetic Tube Tester Separator has been accepted as standard for determinations ofmagnetic content of ores and for checking efficiencies of wet separators. It is applicable to highly magnetic material such as magnetite, powdered iron, flue dust and ferro-silicon. The grade of concentrate that can be produced at any mesh size is quickly determined with this apparatus.

The tube tester consists of an electro-magnet, between the poles of which a glass tube is set at an angle of approximately 45. The tube is supported by an agitating mechanism which is agitated by a small universal electric motor. The tube is simultaneously rotated and agitated between the magnetic poles when the apparatus is in operation. Let our engineers make recommendations for the type and size magnetic separator units best suited to your problems.

The Stearns (Ring Type) Laboratory Magnetic Separator differs materially from the cross belt type; a steel take-off ring is employed in place of belts, to carry the magnetic material beyond the conveyor belt to final delivery. The laboratory unit is popular in many types of ore testing for treating small quantities of material for the recovery of feebly magnetic minerals. Standard accessories include rheostat, ammeter and switch, all mounted on a switch panel.

how to concentrate the alluvial gold with much magnetic mineral - gravity separation & concentration methods - metallurgist & mineral processing engineer

how to concentrate the alluvial gold with much magnetic mineral - gravity separation & concentration methods - metallurgist & mineral processing engineer

And their alluvial gold is with some magnetic mineral,so some magnetic would stay with after gold centrifugal or jig separator . below is the flow offer by some suppliers.Could you give us some suggestion about the flow :

My doubt: is the jig separator necessary in the flow ? is it better ,if we put the magnetic separator after trommel prior to centrifugal ? can we separate the magnetic material without magnetic separator ,because we don't need magnetic as concentrate .

You would not put a centrifugalconcentrate into a jig. See attached. You mightput a jig before a centrifugal separatorin some instances, to reduce the centrifugal mass feed. Remember centrifugal separators are batch devices with a high concentration ratio. They are expensive per unit throughput.

I think a Jig is not necessary in the flowsheet. Theseparation can involve centrifugal concentrators, spiral concentrators, and shaking tables. Centrifugal concentrators can preconcentrate the material. If you include a spiral concentrator, it is possible to get a better concentrate to feed the shaking table. Other point to keep in mind is the specific gravity of the magnetic minerals, usually they range from 4.5 to 6.5, these values are much lower than the specific gravity of gold, 19.3.The shaking table can be used to clean the concentrate from the spiral concentrator.

Apparently you work in a lab. You need to include a mineralogical study to determine the presence of native gold, gold bearing minerals, gold particle size, mineralogical associations, particle size distribution, and gold distribution size by size.

The process may be LIMS to remove magnetite followed by WHIMS to recover hematite and ilmenite . For recovery of pyrite , you may use flotation. There may not be necessaity to go for jigs and instead may use spirals/tables in stages to recover gold. However it is advisable to make a characterisation studies on a sample and undertake beneficiation studies in diffeterent process route to finalise the process.

The post magnetic treatment may be a solution, but the troubles begin when there is no magnetic-gold liberation, This may be analysed following the Holland Batt criteria utilising perfomance curves and a Mineralogist too!!

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roller electrostatic mineral separation - jxsc machine

roller electrostatic mineral separation - jxsc machine

Application Principle: The Electrostatic Mineral Separation is used for recycling of various minerals, waste metals and non-metal materials with conductivity difference such as selected white tungsten, tinstone, zirconite, andalusite, rutile, and gold placer. The High tension Separator is to electrify wire electrodes with a very small diameter with high-voltage direct current to produce corona electric field in the space between the corona electrode and grounding electrode. The entire space close to the grounding electrode carries a negative charge (positive grounding) at the time and the mineral aggregates have the same chance to obtain electrics while passing through the corona electric field. However, due to different conductivity of minerals, they receive different electricity in the electric field and carry away different electric charges so that ore sands fall along different tracks in the electric field. In this way, good separation conditions are created for minerals with good, medium and no conductivity.

1202201651500 Electrostatic Mineral Separation is one of the major magnetic separation equipment in electricity mineral separation. It is widely used in sorting titanium, zirconium, rutile, monazite, iron, tungsten, tantalum, niobium, tin and other precious minerals. Electrostatic Mineral Separation can separate material whichs particle size is from 0.1 to 2 mm and surface temperature is less than 1% of itself. It often works well with the single-disc magnetic separator and permanent magnetic sorting machine in the process of sorting ilmenite, zircon ore and other minerals. The machine has a small size, simple structure, convenient operation and maintenance, safe, effective separation and so on. It has a big amount of users in China, and they are mainly exported to Vietnam, Korea, Indonesia and so on.

Roller Electrostatic Separator High Tension Separator high voltage electrostatic separator mining electrostatic separator mining electric separator rutile refining machine rutile separator rutile separating equipment zircon separating machine zircon refining machine zircon concentrating equipment tin refining machine tin upgrading machine.

american gold miner | magnetic separation

american gold miner | magnetic separation

** The magnetic sands are removed by two separate magnetic fields located inside the magnetic wheel. This field is to the side of the feed so as the feed drops through the water the magnets pull the magnetic sands out while the gold continues to freely fall down into the gold recovery side.

** To avoid any mixing, the trapped magnetic sands are then transported VERTICALLY out of the water medium and into the magnetic sands side.** Fine gold has a tendency to both float and move within a water flow. To stop this potential loss, each Separator uses two separate water systems and pumps.one for the magnetic sands and one for the gold sands.

Other brands have their feed in contact with a solid surface, such as a belt or drum. This causes the gold mixed in the magnetic sands to be trapped against the solid surface and thrown away. In fact 1/3 of the feed removed by such separators is not even magnetic including lots of fine gold.

separation of gold and other rare materials from an ensemble of heterogeneous particles using a ndfeb magnetic circuit | scientific reports

separation of gold and other rare materials from an ensemble of heterogeneous particles using a ndfeb magnetic circuit | scientific reports

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Most solid particles, composed of diamagnetic or weak paramagnetic materials, cannot be extracted by a conventional magnetic separator. Here we report that an ensemble of heterogeneous particles, composed of bismuth, gold, graphite and rock forming minerals are separated into fractions of different materials by small NdFeB magnetic plates. It is based on a recent finding that acceleration of a translating particle, induced by magnetic volume force in an area of field gradient, is uniquely determined by intrinsic susceptibility of material; the acceleration is independent to particle mass. The setup will serve as an effective technique of pre-treatment in analysing mixture of heterogeneous particles; such a technique is desired in various research fields of science, and the magnetic separation may play a role of a chromatography technique conventionally used in the analysis of organic molecules. The portable and low-cost system could provide a breakthrough for on-site research in industrial and medical fields as well as in resource explorations in nature. Extraction of rare materials such as gold or platinum becomes possible in a hazardless manner.

In a conventional magnetic separator, the translation of a particle is induced by an attractive magnetic force caused by a magnetic field gradient; here, the force is generally believed to act only on particles that bear a strong positive magnetization. The induction of a strong magnetic force was realized in a diamagnetic particle by binding a small magnetic bead to the particle; the technique was extended to develop in vivo drug delivery systems1. A separation using- a field gradient force was realized as well in magnetized DNA samples2. Levitation was realized on a human fingertip using a field gradient produced by a small NdFeB magnetic block3. It is seen from these attempts that the demand for inducing effective magnetic forces on weak magnetic (i.e. diamagnetic and paramagnetic) particles is potentially large, because the technique can dynamically translate magnetically inert particles by a relatively simple machine. Accordingly, various attempts were made to dynamically control weak magnetic materials by introducing strong field generators4,5,6,7.

In a recent study, a mixture of particles composed of various weak magnetic materials was magnetically separated into groups of different materials with no magnetic attachments on the particles8; here, the separation was caused by a field gradient produced by a NdFeB magnetic circuit, and the particles were able to translate through a diffused area by applying a microgravity (g) condition. The mechanism of the above separation was expected based on an energy conservation rule recently proposed in a particle that translated by a magnetic volume force9,10. It was experimentally confirmed that acceleration of the particle induced by volume force in an area of field gradient is determined by intrinsic magnetic susceptibility of material, and was independent to its mass. The results were in contrast to the common convention that weak magnetic particles are magnetically inert, especially in the low field intensity produced by a permanent magnet. However, the efficiency of the material separation of the reported system was not high enough for practical use because the quantity of sample that could be separated in a single turn of a g experiment was less than 0.001g, and it took more than 15minutes to complete a single g experiment8. It was also necessary to introduce a drop-shaft system (5050180cm) to apply the g condition8,9,10, which was not useful for practical applications.

In the present report, the separation of weak magnetic particles was performed for the first time in terrestrial gravity conditions using a facile NdFeB circuit; the system is simple and inexpensive compared to the previous setup using the g condition8. The possibility of improving the resolution of the separation using the present apparatus is discussed. The final goal of the improvement is to separate and identify most materials that appear in investigating mixtures of solid particles, which is often necessary in a pre-treatment process of a refined material analysis.

As shown in Fig.1, the size of the apparatus developed to separate the weak magnetic particles was less than 10cm in length, and its weight was below 1000g. Two NdFeB plates (441cm) were used to compose a magnetic circuit that produced a monotonically decreasing field along the x-axis located in a gap (0.4cm in width) between the two plates. The mixture of the particles was maintained in a sample holder with a half-piped scape (0.4cm in diameter and 0.2cm in depth). Before the experiment, the orifice ( 0.07cm) at the bottom of the sample holder was set just below the top level of the gap. A collecting plate was set parallel to the xy-plane at the bottom of the translating area. A section paper was attached to the plate to measure the horizontal separation, xT, of the individual particles with respect to the position of the orifice; the positions were measured after they were collected on the plate.

Sectional view of an apparatus used to conduct the magnetic separation of various diamagnetic and paramagnetic particles by a pair of FeNdB permanent magnets. The field intensity monotonically decreases in the x-direction, and the maximum field at the centre is 9.6kG, which was measured by a gaussmeter. The locus observed in the translating particles recorded by the hi-vision camera is shown in Fig.2 and the particles recovered on the collecting plate are shown in Fig.3. The magnetic susceptibility of the particles ranged between 50107 to +340107emu/g (see Table1), which means that the apparatus is capable of separating most existing materials when the separation resolution is improved.

The numerical data for the five materials observed in the present study are listed in Table1. The paramagnetic olivine sample was a product from San Carlos, New Mexico8,9,10, while the pyroxene sample was a product of Tanzania. The paramagnetic susceptibility, PARA, of the above samples was measured by the vibrating sample magnetometer (VSM), and the results are listed in Table1. The values were consistent with their Fe concentrations determined by a chemical analysis. In most of the materials that exist in nature, the concentration of magnetic ions is below the level of San Carlos olivine. The three diamagnetic samples, namely, bismuth, graphite and gold, were cut from synthetic blocks with high purities (>99.99%) by using a titanium knife to avoid contaminations of small ferromagnetic particles. Among the popular solid materials, graphite is known to have the largest |DIA| value11; accordingly, most of the values reported for the existing weak magnetic materials in nature overlap with the values of the five materials. The diamagnetic susceptibilities of the three materials measured by the VSM method were consistent with the published values. The particles were manually pushed towards the orifice position one by one using a thin copper wire and were dropped from the orifice with small initial velocity; it took approximately 20seconds to complete the translation of the particles set in the sample-holder (~30 particles). The time-dependent photographs of the particle motions were recorded by a high-speed camera8,9,10 from the y-axis direction.

Figure2 shows the locus of five particles observed by the high-speed camera during their translation. The particles are composed of five different materials that have different values, as shown in Table1. It can be seen from the locus that the material separation proceeds due to the variance in the horizontal velocity induced in the individual materials. As mentioned before, the range of values of the five materials overlaps with the range of all the values reported for the existing materials, and it may be concluded that the compact NdFeB circuit used in the present study has the potential to separate an ensemble of heterogeneous particles existing in nature. The published values of some popular materials11 are listed in Table2 for comparison; the variances of these values are derived from the variances in the electron distributions that exist between the materials8, indicating that an intrinsic DIA value is assigned to a solid material.

As seen in Fig.3, the particles released from the orifice are generally preserved on the collecting plate as different groups of materials which were separated during the translation. The length of the horizontal translation xT of each material with respect to the position of the orifice is shown in Table1; here, the values show the average of the separations observed for several particles of a single material. The sequence of the xT value is consistent with that of the published values listed in Table1, confirming the efficiency of the separating system.

Photograph of the collecting plate after the translation definitely showing the material separation of all the particles. The scale in the lower portion show the approximate values that are expected in the particles collected at individual positions. As described in the text, horizontal acceleration of a particle is induced by a field-gradient force during its translation though the gap of magnetic circuit, which is followed by another translation between the gap and the plate. The approximate xT value can be calculated as a sum of the horizontal translations in the above two areas. Numerical relationship between and xT were calculated to obtain the scale; detail of the calculation is described in Supplementary NoteB.

In previous studies on field-induced translation observed in weak magnetic particles8,9,10, the DIA value per unit mass of the particle was obtained from their translating velocity, and it was proposed that the material of the particle could be identified by comparing the observed value with the list of published DIA data11. Here, the value was obtained from an energy conservation rule assuming that the magnetic potential of the particle at the initial position [mDIAB02] was completely converted to kinetic energy [mv T2] in the area of B~0. Here, B0 describes the field intensity at the initial position, whereas vT is the terminal velocity of the particle in the area of B~0; m denotes the mass of the particle. Accordingly, DIA should satisfy the relation,

In the abovementioned conservation rule, the velocity of the particle at the initial position, denoted v0, is assumed to be negligibly small. By inserting in Eq.(1) the values of B0 and vT observed in the present experiment, the DIA values of graphite and bismuth are calculated as (3910)107emu/g and (115.0)107 emu/g, respectively. Here, the field intensity at the orifice was observed as 5.31kG and used as the B0 value in the above calculation; here temperature T was 298K. The time-dependent velocities of the graphite and bismuth particles in the x- and z-directions were obtained from the locus data as shown in Fig.2, and the numerical values in the x-direction were used to obtain the vT values (Supplementary NoteA). The DIA values obtained in the above manner agreed fairly well with the published values listed in Table1, and it may be concluded that the observed translations followed the energy conservation rule (Supplementary NoteB). The above consistency of DIA values show that level of ferromagnetic contamination of the sample particles that may happen during the experimental process is negligible. In the case of paramagnetic materials, the particles translated towards the field-centre area by an attractive field gradient force (see Figs2 and 3), and it was difficult to quantitatively examine the efficiency of the energy conservation rule, because the profile of the field distribution inside the small area of the circuit gap was difficult to obtain by a standard gaussmeter (Supplementary NoteC).

Approximate values that are expected in the particles collected at individual positions on the collecting plate are shown by a linier scale in Fig.3. The values are estimated from a field-gradient force, mB(dB/dx), that is applied on the particle as it translates through the gap of the circuit; detail of calculation is described in Fig.3 (Supplementary NoteB). It is seen that the ranges of particle position observed in individual materials are consistent with the positions expected from the values assigned to the material in a semi-quantitative manner. The deviations between the expected and actual positions derive from the rough assumption of field distribution inside the gap that was made in the calculation; as mentioned before, it was difficult to obtain a precise field distribution inside the narrow gap. By minimizing the above deviations (Supplementary NoteC), material of an unidentified particle can be estimated by comparing the value on the scale with a list of published values (i.e. Table2); the estimation is easily performed without consuming sample.

The separating rate (i.e. sample weight per second) is considerably improved in the present apparatus compared to the experiment recently operated in g conditions8, because it can continuously separate the particles in open air under normal gravity conditions. The portable size of the setup is useful in various on-site activities, such as geological, biological or industrial field research. Furthermore, the machine is applicable in performing the above activities at the surfaces of various solid bodies in the solar system, because the compact size and rigid structure of the setup is suitable for a remote sensing mission8. The results described in Figs2 and 3 provide a firm proof that the simple principle of separation deduced from eq.(1) is effective for existing materials. In the case of separating micron-size particles, the dimensions of the machine can be decreased even more because the separation is realized in a field area with a reduced size. It is noted that temperature may vary from about 200K to 380K when the system is operated in various field activities on the earth; this variance of temperature would considerably alter the field intensity produced by a neodymium magnet to change the B0 value of the experiment. Therefore it is necessary to calibrate the B0 value according to the experimental temperature in the individual experiments to obtain the precise values assigned to the individual particle.

It is seen in Table1 and in Fig.3 that the standard deviation of the measured xT values for the same material, denoted xT, is considerably large, which directly disturbs the efficiency in separating two materials with different DIA values. In the actual experiments, the v0 value of the particle at the time of release was not negligible because collisions between the particles may occur as they pass through the orifice. The Coulomb forces caused between the static electricity on the particles surface (as well as those between the particles and the sample stage) could also induce a finite amount of v0; note that xT was reduced to a certain level in the present study by discharging the particles and the sample stage using an ionizer, however xT was not reduced to a negligible level. The above two factors directly induce xT, because xT correlates with v0 following a relationship xT~v0Tf; here Tf denote the duration of free fall.

As shown in Table2, an intrinsic DIA value is assigned to a solid material, and the numerical values indicate that the materials of two different particles are generally distinguished if the variance of their measured DIA values (denoted ) is above the level of ~108emu/g11. In contrast, the dispersions observed in Fig.3 for bismuth graphite and gold particles indicate that the separation of the two materials by their positions is difficult when is at the level of 107emu/g. To improve the separation efficiency, the above-mentioned disturbances caused by particle collision and/or Coulomb forces should be diminished to minimize v0 of individual particles. Specifically, xT values of two materials in Fig.3 should be reduced to a level that is smaller than the variance of xT between the two materials, defined hereafter as xT.

It is noted that the efficiency of the separation (& material identification) is also improved by increasing the variance of horizontal velocity, vT, between the two materials, which directly increases the xT between the materials. A direct way to increase vT is to enhance the magnetic force produced in the magnetic circuit. Such circuits with enhanced field gradients were previously introduced to detect the DIA values of small particles from their field-induced translations9, and the field gradient produced by the circuit was as large as 6250G/cm. The above experiment was conducted in a g facility that required a limited pay load size, and the circuit with an edge length of ~10cm (weight: ~1.5103g) suited this condition; it is noted that this circuit is suitable for on-site transportation in a material separation project in normal gravity condition (Supplementary NoteD).

The extraction & identification of new solid phases from a heterogeneous particle ensemble may lead to important discoveries in various researches based on material analysis. Although it is possible to perform refined survey on a mixture of the heterogeneous particle using various microprobe devices, it is difficult to conclude by these devices whether or not the minor particles included in the sample are thoroughly identified without omission, and new categories of minor material phases may remain undiscovered in the mixture8. In such cases, it is desirable to separate the particles into groups of different materials before performing the refined analyses. In this sense, the proposed method can be used as a new type of chromatography technique12 specialized for particle mixture samples.

Resource exploration of rare metallic materials such as alluvial gold is a possible eligible application using this NdFeB magnet separation. So far, mercury amalgamation has been used for gold/silver extraction from parent rocks, and pure gold/silver is collected by evaporating the mercury in chemical plants, causing various hazards (e.g. health hazards, pollution in the atmosphere, and mercurial toxic waste). As seen in Table2, the -value of Au is 1.42107emu/g, which is distinct from that of silver (1.9107emu/g), paramagnetic pyrite and other major minerals in the parent rocks that possess paramagnetic susceptibility. Hence, gold particles can be collected after a physical crashing without any chemical treatment that may cause the various hazard problems, as mentioned above. Moreover, the extraction of gold particles from urban mining resources is also applicable because the || values of the resin11 materials used as the electronic circuit boards are much larger (>3107emu/g) than that of gold. Extraction is also possible for other rare materials such as indium (x=1.1107emu/g), platinum (=+9.8107emu/g) or niobium bearing particles in a hazardless manner from both natural and urban resources.

Attempts have been recently made to decontaminate the soils polluted with radioactivity using the strong field-gradient force produced by a superconducting magnet after the Tohoku earthquake13. Here the magnetic force that acts on the soil particles is considerably enhanced by coating paramagnetic ions on the particle surface. Previous studies were efficient, but a facile magnetic-separation system has been desirable for on-site examination and decontamination over a wide area. Hence, the proposed method is also expected to promote the on-site separation of polluted soil dusts.

Another advantage of the proposed separation system is that the sample particles are preserved in the course of separation & identification. The present study proved that this facile NdFeB magnet circuit is applicable for precious samples, such as the asteroid regoliths collected by the Hayabusa214,15 and OSIRIS-Rex sample return mission16,17, which are mixtures of various minerals and organics. By improving the efficiency of the proposed method, even micron-order grains can be thoroughly separated by the proposed principle, and their material can be identified without sample loss. Using a conventional analyser, such as a mass spectrometer, it is difficult to precisely identify the material of a solid particle without consuming sample.

In conclusion, we have established a new process to separate and/or identify most existing solid materials from =52107emu/g (diamagnetic graphite) up to+340107emu/g (paramagnetic olivine) by a rigid pocket-size system operated in open air, which is assembled and operated at a low cost (<105 JPY). Further improvements to optimize the parameters of xT and vT, which directly contribute to the resolution of separation and identification, would result in a breakthrough in various research fields of science, both in on-site field activities as well as in pre-treatment processes of refined analyses in laboratory. Finally, the mass independent property observed in a translated particle, which is presently recognized only in gravitational motions, will be easily induced by the cause of magnetic volume forces in outer space; it may be commonly observed in nature as well because both solid particles and magnetic field co-exist in various regions of the galaxy8. The mass independent property of field-induced translation has been recently confirmed in particles that bear ferro- (feri-) magnetic moment18 and the proposed separation is effective in all categories of magnetic material that exist in outer space.

Hisayoshi, K., Uyeda, C., Kuwada, K., Mamiya, M. & Nagai, H. Magnetic ejection of diamagnetic sub-millimeter grains observed by a chamber-type G generator orientated to identify material of a single particle. Earth Planets Space 65, 199202 (2013).

Lauretta, D. S. et al. The OSIRIS-REx target asteroid (101955) Bennu: Constraints on its physical, geological, and dynamical nature from astronomical observations. Meteoritics & Planetary Science 50, 834 (2015).

Kuwada, K., Uyeda, C. & Hisayoshi, K. Attempt to detect magnetization of a single magnetic grain by observing its field-induced translation in G condition. J. Jpn. Soc. Powder & Powder Metallurgy 61, S78 (2014).

C.U. newly developed the core hypotheses of magnetic separation that is operational in normal gravity, designed the apparatus to examine separation, constructed the apparatus and conducted the experiment; he wrote 50% of the main text. K.H. obtained the numerical results by analyzing the experimental data, prepared all the Figures and Tables, and wrote 25% of the main text. K.T. indicated the broader significance of the obtained results in various research fields, improved the overall design and structure of the manuscript, and wrote 25% of the main text; he proposed to add a scale bar in Fig. 3. All authors discussed the data and reviewed the manuscript.

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the articles Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the articles Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

Uyeda, C., Hisayoshi, K. & Terada, K. Separation of gold and other rare materials from an ensemble of heterogeneous particles using a NdFeB magnetic circuit. Sci Rep 9, 3971 (2019). https://doi.org/10.1038/s41598-019-40618-2

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