Commonly used beneficiation methods include gravity separation, flotation, magnetic separation, electrical separation and chemical beneficiation. Even the same type of copper ore, it is necessary to design the most appropriate process according to local conditions, and cannot be copied completely.
The gravity separation method sorts minerals according to their relative density (usually called specific gravity). Mineral particles with different densities are subjected to the action of fluid power and mechanical force of various mineral processing equipment in the moving medium (water, air and heavy liquid), resulting in suitable loose stratification and separation conditions, so that the mineral particles of different densities are separated.Currently, gravity separation is only used to select copper ores with coarser inlays, and is especially suitable for copper oxide ores with higher density. Commonly used gravity separation equipment includes heavy medium beneficiation, jig and shaker.
The flotation method is based on the difference in the physical and chemical properties of the mineral surface, processed by the flotation agent, and the mineral is selectively attached to the bubbles to achieve the purpose of separation. The beneficiation of non-ferrous metal ores, such as copper, lead, zinc, sulfur, molybdenum, etc., is mainly treated by flotation; some ferrous metals, rare metals, and some non-metallic ores, such as graphite ore, apatite, etc. are also used for flotation Law selection.
The magnetic separation method is based on the different magnetic properties of minerals. Different minerals are subjected to different forces in the magnetic field of the magnetic separator, so as to be sorted. It is mainly used for sorting ferrous metal ores (iron, manganese, chromium), but also for sorting non-ferrous and rare metal ores.
The electrical separation method is based on the difference in mineral conductivity. When the mineral passes through the high-voltage electric field of the electric separator, due to the different conductivity of the mineral, the electrostatic force acting on the mineral is also different, so that the mineral can be separated. The electrical separation method is used for the separation of rare metals, non-ferrous metals and non-metallic ores. At present, it is mainly used for separation and beneficiation of mixed coarse concentrates, such as separation of scheelite and cassiterite, beneficiation of zircon, and beneficiation of tantalum and niobium ore.
Chemical beneficiation is a mineral processing process based on the difference in the chemical properties of minerals and mineral components, using chemical methods to change the mineral composition, and then enriching the target components by other methods. For example, leaching copper ore containing malachite with dilute sulfuric acid changes the mineral composition, that is, malachite becomes a copper sulfate solution, and then replaces copper ions in the solution with iron filings to obtain metallic copper.
Copper beneficiation technology basically includes crushing, grinding, grading, sieving, sorting, drying and other processes. Each process is connected by a conveyor to ensure the integrity of the connection between the various processes.1. Copper smeltingCopper concentrate is the primary mineral material for copper smelting, and its smelting methods include fire method and wet method. At present, the fire method is the main method, and the wet method is in the experimental discussion period.
2. Washing and screeningOre washing equipment uses water flushing and mechanical scrubbing to separate the ore from the mud. Commonly used ore washing equipment include ore washing screen, cylinder trommel scrubber washing machine and trough type washing machine.Ore washing work is often accompanied by sieving, such as flushing directly on the vibrating screen for cleaning or sending the ore (net ore) obtained by the ore washing machine to the vibrating screen for sieving. The sieving can be used as an independent work, separating the different sizes and grades of copper concentrate commodity supply with different uses.
The working condition of a processing plant is constant and choosing the best processing solutions is related to the ore nature. Taking Jiangxi Dexingcopper mineral processingas an example. Firstly, look at the copper mine process, the porphyry coppers is surrounding rock, mainly acidic porphyry, and metal minerals of this type of deposit are mainly chalcopyrite. According to copper ore process,copper ore processalso adopts the best process to develop according to the ore properties.
Thecopper mine processis three stages with closed-circuit and washing (with spiral classifier shaker) process, now the amount of mud becomes less, and it changed to three closed-circuit process, thiscopper mine processcan be finally crushing the ore to less than 15mm. The equipment used here including lattice screen, vibration screen,jaw crusher, cone crusher, classifier and other equipment. The size distribution of pyrite is 0.003~0.4mm, and most is grain. When the particle size reaches 0.14mm, the degree of dissociation of single body can reach more than 80%. However, due to the need of fine grinding, the ore is not uniform, only fine grinding can achieve better selection index.
Copper, due to the present world demand and price, is of foremost interest to the mining industry. Many new properties are either in the process of being brought into production or are being given consideration. Copper minerals usually occur in low grade deposits and require concentration prior to smelting. The method and degree of concentration depends on smelter location and schedules, together with the nature of the ore deposit. Sulphide copper ores generally occur with pyrite, pyrrhotite, arsenopyrite and molybdenite, and with gold and silver. A complete copper-iron separation may not always be essential for the maximum economic recovery and often is tied to the distribution of the gold and silver values.
The above flowsheet is designed for the treatment by flotation of copper as chalcopyrite with gold and silver values. The ore, ranging from 60-65% silica, with pyrite, arsenopyrite, and calcite with 3 to 4% copper. This flowsheet, though simple, is adequate for tonnages of 100 to 500 tons or more per day, depending on the size of equipment selected. It can be readily expanded by duplicating units for increased tonnages. By minor circuit changes, it provides the flexibility to treat a range of ore conditions which are often encountered in any mining operation. Generally in these small plants the recovery of molybdenum is disregarded unless it is present in considerable amounts. Larger plants generally will incorporate a circuit for molybdenum recovery from the copper concentrate by flotation. Sub- A Flotation is standard for this service.
Crushing Section. The crushing section with two-stage reduction is suitable for smaller tonnages, depending on the ore characteristics. Three-stage reduction in either an open or closed circuit, with screens for the removal of fines can be employed where conditions warrant. The fines are removed by a grizzly or screen ahead of each reduction stage for higher efficiency and for reduced wear on crushing surfaces.
Feed control is essential to efficient grinding and helps reduce surges and fluctuations throughout the entire plant. The Ball Mill in closed circuit with a Spiral Classifier discharges the pulp at about 60% minus 200 mesh. The Ball Mill is equipped with a Spiral Screen on the discharge for removal of any tramp oversize, worn grinding balls, and wood chips from the circuit.
The pulp from the Conditioner is treated in a 10-cell Sub-A Flotation Machine and a 4-cell Sub-A Flotation machine. Sometimes conditioners are not provided; however, their use insures that reagents are thoroughly mixed into the pulp ahead of flotation. This gives a more uniform feed and effective use of reagents plus improved flotation conditions. The 10-cell Sub-A Flotation Machine is of the free-flow type. Weirs for the control of pulp level through the machine are provided at the fourth, eighth and tenth cells. This free-flow type provides ample volume for normal fluctuations in the feed rate without cell level adjustment. Sand relief ports help extend the long life of the molded rubber wearing parts.
The first eight cells produce a rougher concentrate while the last two cells act as scavengers. The concentrate or middling product from these two cells is returned by gravity back to the fifth cell. The rougher concentrate from the first eight cells is cleaned in two stages in the four-cell standard Sub-A Flotation Machine, of the cell-to-cell type. No pumps are needed for the return of these flotation products for cleaning. This feature in Sub-A Flotation Machines gives added flexibility by enabling the operator to change cleaning circuits readily, should conditions require. The tailings from the cleaner flotation section are pumped back to the ball mill for regrind. To control dilution a cone classifier is placed in this circuit with the coarse solids going to regrind and the overflow used as dilution in the mill and classifier. It is possible to eliminate this classification in some cases but control is less positive. A separate regrind section could be provided if the quantity of middling products were enough to make this section feasible.
The final cleaned flotation concentrate flows or is pumped to a Spiral Rake Thickener. A Adjustable Stroke Diaphragm Pump, mounted on the thickener superstructure, meters the thickened concentrate to the Disc Filter. The Thickeners are often used to store concentrates for filtration at fixed intervals. These units have heavy duty construction throughout, overload indicators and positive rake lifting features. The Diaphragm Pump is used for concentrate recirculation purposes during such periods.
Lime is added to the Ball Mill by a Cone Type Dry Reagent Feeder. Other reagents, such as cyanide, xanthate, and a frother are fed and controlled by No. 12A Wet Reagent Feeders to the classifier and to the conditioner ahead of flotation.
This flowsheet stresses simplicity without sacrifice of efficiency. The factors of flexibility are essential to meet changing ore and market conditions. The unit arrangement which can be expanded by sections for increased capacity is an important feature. The equipment indicated has been proven for long life and low maintenance, and to give superior results. The Sub-A Flotation Machines are designed for high capacity and with features of flexibility to handle fluctuating conditions with a minimum of operating attention. Low final tailings and high grade concentrate are assured through the selective action of the Sub-A in the roughing, cleaning, and recleaning circuits.
Large scale mining operations, of which the porphyry coppers are typical, must resort to concentration. This is necessary as the ores are generally low grade and require flotation to produce a concentrate acceptable to the smelters.
These large scale milling operations handling low grade ore must provide very careful planning in the design of their plant flowsheet and selection of equipment. Milling circuits must be as simple as possible and for large tonnages, as few as possible. It is for this reason grinding mills and flotation circuits arenow designed to handle these large tonnages at low cost.
Sub-A Flotation Machines are a basic part of large tonnage operations and their use assures maximum economic recovery. Particular emphasis has been placed on the design and operation of these machines for roughing, scavenging and cleaning. Mechanisms have been greatly simplified and molded rubber wearing parts are standard for maximum abrasion resistance.
Three stage crushing is illustrated in the flowsheet; however, it is possible and practical to eliminate the third stage by incorporating a rod mill in the grinding section. This is a very practical arrangement and often a necessity when handling wet, sticky ore. There is evidence that this combination of crushing and grinding results in lower costs for reducing large tonnages of ore to flotation size.
The flowsheet illustrates a typical grinding circuit with a rod mill in open circuit. Its discharge, usually all 14 mesh, goes to a classifier for removal of finished material. The classifier sands are ground in a ball mill in closed circuit with the same classifier. High speed rod milling with speeds up to 80% of critical has shown definite improvement in efficiency and grinding capacity. Proper selection of mill density and grinding charges are also factors of importance. Usually the rod mill is operated at lower density so it acts partially as its own classifier for retaining oversize for further size reduction.
Some conditioning of the pulp ahead of flotation is usually very beneficial and will result in more uniform and rapid flotation of a selective high grade concentrate. For this service the (patented) Super Agitator and Conditioner is standard. Reagents added at this point are thoroughly mixed and reacted with the pulp. Any tendency of the pulp to froth prematurely is readily overcome by the patented standpipe arrangement which also assures positive pulp circulation.
For large tonnage circuits normally encountered in many of the copper operations the open or free flow type Sub-A Super Rougher Flotation Machine is recommended. Intermediate cell weirs are eliminated and circulation of pulp through the impeller is fixed to provide the desired agitation and aeration for rougher flotation conditions. Machines are usually arranged with up to six cells being open or free-flow without intermediate weirs. Two or more machines are always provided in series. This allows adequate volume for absorbing surges and fluctuation in feed without cell adjustment. Mineral and middlings in the teeter or quiescent zone of the cell are gradually forced upward to the froth removal zone. Only the coarser material in the agitation zone passes through the impeller for further conditioning and bubble attachment.
In the flowsheet each circuit consists of 16 or 18 cells in 4 or 6 cell units. These Sub-A Super Rougher Flotation Free-Flow Machines are in series. All of the mechanisms are of the single impeller type and are completely supported from the superstructure to facilitate maintenance. All heavy hoods and castings are eliminated and the impeller-diffuser clearance is pre-set and accurately maintained throughout the long life of the heavy duty moulded rubber wearing parts. The last two cells are the super scavenger type giving veryintense agitation and aeration to float the last trace of recoverable mineral or middling for re-treatment.
Rougher flotation concentrates are cleaned in a standard Sub-A Flotation Machine with cell to cell pulp level control. This arrangement for upgrading concentrates is universal in its acceptance by the ore dressing industry. Two or more stages of cleaning in the same machine are accomplished without auxiliary pumps and ideal flotation conditions for producing high-grade concentrates are easily maintained.
Cleaner flotation tailings are returned to the head of the rougher flotation circuit for retreatment. In many milling circuits, particularly if coarse grinding is used, the cleaner tailings will contain middlings or mineral with attached particles of gangue. In these cases it is necessary to thicken or classify and regrind this fraction. Centrifugal classifiers are being very successfully applied for the classification step although they do take considerable power and require more maintenance than a thickener with its underflow going to a regrind circuit.
The flowsheet incorporates thickening for both the concentrates and tailings for water reclamation and tailings disposal purposes. A Adjustable Stroke Diaphragm Pump on the concentrate thickener assures absolute control of the volumes delivered to the Disc Filter. When the filter is down temporarily for bag changes the concentrates may be recirculated to the thickener by this same pulp.
Flexibility and simplicity are the two most important points to design into any large tonnage flotation operation. The arrangement shown is flexible and will permit addition of extra milling sections up to the limit of the designed capacity of the crushing plant. Sub-A Flotation Machines are designed specifically for high tonnage installations and have been proven for all types of applications. Rugged construction will give years of service at lowest possible cost. This flowsheet is readily adaptable for the treatment of other ores. Note particularly the location and use of Automatic Sampler.
Copper, one of our most important minerals, is found in many parts of the world. One of the major sources of Copper is the so-called porphyry ores such as the large deposits in the west and southwestern United States, Mexico, South America and Europe.
Porphyry ores, with copper occurring in the form of Chalcocite and Chalcopyrite are normally low in grade and the copper minerals must be concentrated before smelting. In this flowsheet using Sub-A Cells the emphasis is on maximum economic recoveryhigh concentrating efficiency together with a premium smelter feed with a low alumina and magnesia content in the flotation concentrate.
To obtain lowest tailings from this ore usually requires scavenging of rougher flotation tails. This is performed ideally by the Sub-A Super Rougher Flotation Machine which was specially developed for this duty. This machine has a double impeller and gives tremendous aeration. The flowsheet in this study is designed to get the maximum recovery from a large tonnage of porphyry copper ore.
The crushing section consists of three-stage ore reduction with either a grizzly or vibrating screen between each crushing stage. Removing fines before putting the ore through a crusher increases the efficiency of the crusher as it is then only working on material that must be reduced, and is not hampered by fines already reduced in size. Electromagnets and magnetic pulleys are used to remove tramp iron from the ore, the former to remove the iron near the surface and the magnetic pulley to remove the tramp iron close to the conveyor belt.
Porphyry copper ores usually are medium to medium hard and require grinding to about 65 mesh to economically liberate the copper minerals from the siliceous gangue. Sometimes a regrinding circuit is advantageous on the rougher concentrate and on the scavenger concentrate. This will liberate the mineral from the middling products and increase the recovery by putting those mineral particles into the concentrate. Rougher flotation may be accomplished at a relatively coarse grind and the subsequent regrind performed on a comparatively small tonnage.
Lime is usually added to the ball mill feed by a Dry Reagent Feeder. The frother and promoter are added in the classifier prior to flotation to realize the full effect of the reagent. Reagents can also be stage- added to the cells in the flotation circuit.
Standard Sub-A Flotation Machines are used for both the rougher and cleaner circuits, where their cell-to-cell principle gives both high recovery and a good grade of concentrate. The rougher concentration is accomplished in 6 or 8-cell flotation machines, with the concentrate from each goingto a separate bank for cleaning and re-cleaning. No. 30 Sub-A Flotation Machines are ideal for large tonnage operations, as each bank will handle from 1000 tons upward per day. Tails from the rougher circuit go to a scavenger circuit. Roughing, scavenging, cleaning and recleaning can be carried out in one bank of Sub-As. This is possible because of the distinctive gravity return of a product from any cell to any other cell of a bank without using pumps. In large installations, however, these steps are usually carried out in separate banks of cells. The scavenger flotation circuit consists of a 4-cell, Sub-A Super Rougher Flotation Machine with its super aeration. The concentrate from scavenger cells is returned to the head of the rougher cells and tails are sent to tailing pond. The new Sub-A Super Rougher Machine is designed especially to produce the lowest possible tailings in the mill circuit by scavenging off the last bit of recoverable and often difficult to float mineral. The Automatic Sampler is used on the flotation feed, concentrates and tailings to establish close mill control.
The flowsheet incorporates a thickener on the copper concentrates to thicken for optimum filtering. This also serves as a temporary storage space to accommodate operating requirements. The Adjustable-Stroke Diaphragm Pump on the thickener gives absolute control of volumes pumped to the filter. When the filter is shut down concentrates may be recirculated to the thickener by this same pump.
It is essential to have flexibility in any mill circuit, but particularly in large-tonnage operations such as this. Changing ore, changing market conditions and many other factors make this flexibility absolutely necessary. A slight change, easily made, in a flexible flowsheet may increase tonnage, improve recovery and lower grinding and reagent costs.
The Ookiep Copper Company Was Floated On The New York Stock Exchange During The 1940S In The 1960S, Ookiep Copper Company Paid The Highest Dividend Ever On The NYSE For That Period Ookiepmine Ore Dressing Floors, 1890 A Cornish Beam Engine House On The Site Of Okiepmine
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The impeller is rotated by V-belt of motor and produces negative pressure by centrifugal function. Enough air is sucked to mix slurry, and slurry mixes drug at the same time. Mineral sticks on bubble completely and floats on the surface of slurry to form mineralized bubble. Useful bubble is scraped out by adjusting flash-board height and controlling liquid surface.Get in Touch with Mechanic