Heap leaching is a process that grinds gold mine with low grade to certain particles , heap upon the leakage-proof bottom mat that concreted by pitch , concrete or plastic cloth , spray the low concentration cyanide solution, alkaline solution nontoxic solvent dilute sulphuric acid on the stock heap, make the gold dissolve the solution with gold heap up, then use active carbon to absorb or use zinc cementation to recover the gold .
Heap Leaching is a process that used to treat the gold mine with low grade, cause its processed simple, easy operation, low energy consumption, investment saving, effective . Scale can be chosen, the maximum scale can be million tons /day.
Technology process Heap leaching process composes of concrete of the site, pre-process of the ore (crush or produce), concrete heap, spray leaching, disinfect and discharge the recovery of gold from pregnant solution.
Raw ore processing After the raw ore ground by jaw crusher and cone crusher, the particles become (30-50mm), put them to concrete directly; fine particles need to be produced (make the fine particles become the rough particles ) then transport the mineral by forklift truck to the concrete heap.
Spray system : put a spray system above the heap. After cyanide solution and heap reacted, the pregnant solution exudes from the heap and flow into the pregnant tank, then infiltrate into absorption column by the pregnant solution pump, the solution rest is the barren solution, barren solution return to spray system for recycling. Desorption and electrowinning : with high temperature and high pressure in the desorption and electrowinning, the gold pulp come out, after smelting, come out the gold bullion. The main equipment in heap leaching that including jaw crusher, cone crusher, spray device desorption and electrowinning, smelting device etc.
The main equipment in heap leaching thatincluding jaw crusher, cone crusher, spray device desorption and electrowinning, smelting device etc. Heap leaching is an industrial mining process used to extract precious metals, copper, uranium and other compounds from ores, using a series of chemical reactions to absorb specific minerals and separate them from other soil materials.
Gravity beneficiation is refers to separating gold ore according to mineral density and plays an important role in contemporary mineral processing methods. The main gravity separator equipment are chute, shaker table, mineral jig, hydrocyclones, etc.
Whatre the limitations of the flotation method? For the ores with particle size greater than 0.2mm, and the quartz gold-bearing ore containing no sulfide, it is not suitable to use the flotation method.
The amalgamation process is an old gold extraction process, simple and economical, suitable for the recovery of coarse-grained monomer gold, but it has pollution to the environment and is was gradually replaced by gravity separation, flotation and cyanidation process.
Among the gold resources, the amount of low-grade oxidized ore occupies a certain proportion. It is not economical to use the cyanide method to extract gold, and the heap leaching process has economic benefits.
The heap leaching method actually deposits gold-bearing ore on an impervious site and is immersed and leached with a cyanide solution. After dissolving the gold and silver in the ore, the pre-designed grooves along the site flow into the storage tank. The gold-silver-containing liquid is carbon-adsorbed with activated carbon and then desorbed to recover gold and silver.
Gold Leaching( carbon in leach) processis widely used in the newly built gold leaching plants in recent years, and a lot of plants are changing into CIL as well. GoldLeaching CIL process is suitable for the treatment of oxidized gold ore with low sulfur content and mud content. It is unsuitable for the gold ore with high-grade silver. Generally, the proportion of gold and silver should not exceed 1:5. The best conditions for CIL process in China: PH=10-12, sodium cyanide concentration is not less than 0.015%, the particle size of activated carbon is 1.0-3.35mm, the type of carbon is coconut shell activated carbon, and the slurry concentration is 40-45%. Gold Leaching Methods: flotation, carbon pulp adsorption, gravity beneficiation, and so on. These three methods of the leaching process and gold mining equipment manufacturing can be completed independently. Gravity separation and flotation are the common beneficiation methods used in gold ores, and great improvements have been made in the beneficiation technology and equipment. The mainstream gold extraction methods is generally by crusher, then comminuted by the ball mill, and then through gravity separation and flotation technology, the concentrate and tailings are extracted, chemically refined, and refined to produce gold.
Gold Leaching( carbon in leach) was developed from CIP( Carbon In Pulp), is characterized by less process flow, timesaver in the leaching process, thus reducing the production expenditure. Besides, advanced extraction technology improving the efficiency of gold extraction. The CIL production line is wider use than CIP in the mineral industry. Gold Processing Steps, Introduction of gold CIL production line: A. RAW MATERIAL PREPARATION: vibration feeder- conveyor belt- crusher -Crushing- grinding- leaching- desorption electrolysis- tailings dehydration B. LEACHING and elimination: The thickened material is leached from eight agitators; a qualified reagent is added to the first set of agitators, and the activated carbon is lifted from the last set of agitators to the second set of agitators via an airlift to resist electric currents The activated carbon from the second set of agitators is raised to a carbon screen to obtain gold-loaded carbon, and the remaining slurry is returned to the first set of agitators And then into the tailwater treatment phase. C. Tail Water Treatment: The tailings will be raised to pressure filter, filter cake known as tailings, through the belt conveyor and truck transport to the yard, filtrate into the circulating water tank for reuse. D. AURIFEROUS CARBON TREATMENT: Gold powder is obtained by batch treatment of gold-containing carbon by desorption and electrolysis equipment. The dust enters the furnace and turns to the bar. The gold-containing carbon after electrolysis can be returned to the final stage of the reprocessing flowchart.
Vein gold, is also known as lode gold, there are many types of vein gold ore, which can be summarized as gold-bearing quartz vein or gold-bearing pyrite quartz vein gold ore; gold-bearing pyrite granite type; gold-bearing polymetallic sulfide ore quartz vein type; gold-containing oxidized ore quartz vein type and gold-containing tungsten-arsenic ore quartz vein type. According to the characteristics of each type of ore, vein gold beneficiation processing methods include gravity separation, amalgamation, flotation, cyanide, the carbon in pulp and resin adsorption.
Gravity separation is one of the oldest and most common gold extraction methods. In the placer gold deposits, the density of gold is generally greater than 6t/m3, which is different from the density of gangue. Therefore, the gravity separation method is the most important, effective and economical method for gold mining. However, it is rarely used alone in the vein gold processing plants, more often combines the jigging machine, shaker table or spiral chute to recover the coarse gold. That is beneficial to improve the flotation and cyanide effect.
The amalgamation method can be divided into internally mixed mercury and externally mixed mercury according to its production mode. In the alluvial gold deposit mining, mercury is widely used to separate gold and heavy sand minerals. In the vein gold mine, amalgam is usually used as part of the combined process with flotation, gravity separation, cyanidation, etc., for the capture of coarse monomers gold.
The main equipment for external amalgamation is a mercury-mixing plate, which consists of a bracket, a bed surface and a mercury plate. The mercury plate material various in copper plate, silver-plated copper plate, sterling silver plate, etc., and the silver-plated copper plate has the best mercury-mixing effect. In order to facilitate silver plating and easy replacement in production, the electrolytic copper plate is often cut into small pieces of 400-600 mm in width and 800-1200 mm in length, and after silver plating, the blocks are laid on the bed surface in the oblique direction of the bracket.
Flotation is one of the most widely used methods for processing lode gold ore. In most cases, the gold flotation method has the best effect in the sulfide mineral ore containing gold. Flotation can not only maximize gold enrich into sulfide mineral concentrates, but also treat tailings. The flotation process is also used to treat polymetallic gold-bearing ores such as gold-copper, gold-lead, gold-bismuth, gold-copper-lead-zinc-sulfur ore. For this type of ore, the flotation process can effectively select various gold-bearing sulfide concentrates, which is conducive to the comprehensive recovery of mineral resources. In addition, the refractory ores that cannot be directly treated by amalgamation or cyanidation are also required to be treated by a combined process including flotation. Of course, the flotation method also has limitations; for coarse-grained inlays, ores with a gold particle size greater than 0.2 mm, and for quartz-bearing gold-bearing ores without sulfides, it is difficult to obtain a stable flotation foam after slurrying, thus not suit for using flotation.
In recent years, the flotation process of gold ore has made great progress, mainly in the innovation of process, the development of new agents, and the improvement of design. The use of stage grinding and stage selection process is the current development trend of flotation gold selection. Most foreign gold selection plants use two or even three sections, and the recovery rate of gold is increased by 2% to 6%.
Because the flotation method can only maximize the concentration of gold into various sulfide mineral concentrates, and can not finally obtain the finished gold, therefore, there are only a few gold selection plants using a single flotation process, generally the flotation is used as a joint. A process of the process is adopted. At present, Chinas gold selection plants using a single flotation process include gold mines such as Suichang and Xiuyan, as well as small gold mines in some local groups.
Since the cyanidation process was applied to the gold and silver mines in 1887, it has a history of nearly one hundred years. Because of its high recovery rate and strong adaptability, it is still one of the main methods of gold production.
The cyanidation process can be divided into agitating cyanidation and diafiltration cyanidation. Stirring cyanidation for treatment of re-election, mercury-mixed tailings and flotation of gold-bearing concentrates, or for full mud cyanidation; and diafiltration cyanidation for treatment of flotation tailings and low grade gold Heap leaching of ore. The conventional cyanidation process is a very mature process, which includes preparation of leaching raw materials; stirring cyanide leaching; countercurrent washing solid-liquid separation; leaching liquid purification and deoxidation; zinc powder replacement and pickling; and smelting ingots and the like.
The CIP process is a new technique for recovering gold and silver after developing based on conventional cyanide leaching and zinc powder replacement. It is mainly composed of leaching raw material preparation, stirring leaching and countercurrent carbon adsorption, gold loaded carbon desorption, electrowinning or deoxidizing zinc powder replacement, smelting ingots and regeneration of activated carbon.
Heap leaching is the transfer of the mined ore to a pre-prepared yard to pile up, or directly on the stored waste rock or low-grade ore, using cyanide leaching solution for spraying or diafiltration, so that the solution passes through the ore. The percolation leaching action is generated, the cyanide leaching solution is circulated several times, the ore heap is repeatedly sprayed, and then the leachate is collected, and then treated by activated carbon adsorption method or metal zinc replacement method. The gold grade of the ore treated by the heap leaching method in foreign countries is generally 1~3g/t, the recovery rate of gold is 50%-80%, and the recovery rate of silver is 30%-50%.
Xinhai mineral processing equipment mainly include: grinding equipment, flotation equipment, dewatering equipment, magnetic separation equipment, and so on. Some of the equipment is Xinhai independent research and development, and has been awarded national patent. View details
Gold CIP Production Line adsorbs gold from cyaniding pulp by active carbon including 7 steps: leaching pulp preparation, cyaniding leaching, carbon adsorption, gold loaded carbon desorption, pregnant solution electrodeposit, carbon acid regeneration, leaching pulp. View details
Gravity separation process is the earliest method that applied in mineral processing. According to the density difference among mines and the difference of gravity, fluid power and mechanical force in moving medium, mines realizes mineral grains separation through density difference, it still occupies an important position in the contemporary mineral processing methods.
Gravity separation process is widely applied in gold ore, tungsten ore, tin ore, manganese ore, mercury ore, titanium ore, lead ore, tantalum-niobium ores, galena, barite, fluorite ore, pyrite, limonite, hematite, antimony, chromium ore and ferrous metal.
Xinhai gravity separation process simplify the production process and avoid over-cycles; Tailings has less environmental pollution; Xinhai gravity separation equipment have simple manufacture, better stability, which saves energy and reduces cost.
The crushing and screening stage in the industry is mainly composed of three-stage and a closed-circuit process. Gold ores need to go through coarse, medium, and fine crushing processes to be minimized into smaller pieces. The screening equipment is used to sieving the smaller gold ores into the proper size for the next steps.
The grinding operation usually adopts one or two ball mills with types of lattice and overflow. The second stage grinding operation forms a closed circuit with a spiral classifier or a hydro cyclone to ensure the grinding fineness.
Since traditional ball milling equipment appears some shortcomings such as fast wear and large energy consumption, many manufacturers adopt new wear-resisting rubber lining boards, sliding bearing to improve a mill operation efficiency and prolong a machine's service life.
The beneficiation stage is a crucial part of gold extraction during the whole gold ore processing plant. Placer gold mine and rock gold mine are most widely processed to extract gold concentration.
The gold slurry process of the carbon slurry method (CIP and CIL) is to put activated carbon into cyanide ore slurry, adsorb dissolved gold on activated carbon, and finally to extract gold from activated carbon.
Equipment required for carbon slurry gold mining process: Leaching mixing tank, activated carbon screen, Two-layer (three-layer) washing and thickening machine, fast desorption electrolysis system with high-efficiency and low-consumption, high-frequency dewatering screen.
It means that by ion exchange resin, gold also can be extracted from ore pulp. Like carbon, the process makes gold absorbed onto solid spherical polystyrene resin beads instead of activated carbon grains.
According to different physical and chemical properties of different types of gold ores, flotation separation utilizes various reagents to make the gold attached to the bubbles then scraping these gold particles from blades to get the concentrate.
A jigger is one of the main pieces of equipment in the gravity separation process. The jigging process mixes gold ore particles of different specific gravity together, then stratifying these particles. The minerals with small specific gravity will be on the upper layer while the minerals with large specific gravity will be on the lower layer.
A shaking table is used to process gold ores in the horizontal medium flow. The motor drives the surface of the shaker to perform the longitudinal reciprocating motion, as well as the differential motion of the washing stream and the surface of the bed. Gold ore particles are stratified perpendicular to the surface of the bed, then being separated parallel to the surface of the bed in reciprocating motion which allows gold ores with different particle sizes to be discharged from different parts to achieve separation.
It adopts lope water flow to achieve separation. With the effect of the combined force of water flow, mineral gravity, the friction created by the bottom of the tank, and ore particles, the gold ore particles will settle in different areas of the tank. The ore particles with small specific gravity will flow away with the water, while ore particles with larger specific gravity would stay.
Metso company is a world-leading industrial company offering equipment and services for the sustainable processing and flow of natural resources in the mining, aggregates, recycling, and process industries.
SGS Company is a multinational company headquartered in Geneva, Switzerland, providing inspection, verification, testing, and certification services. It's ranked by Forbes as one of 2017 Top Multinational Performers.
Henan Fote Heavy Machinery Co., Ltd. (FTM) has more than 40-year experience in the design of gold mining equipment processes. Its beneficiation equipment and plants sales to many countries including Tanzania, India, South Africa, the United Kingdom and other regions. According to the actual needs of customers, all machines can be customized here.
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Based on the high quality and complete after-sales service, our products have been exported to more than 120 countries and regions. Fote Machinery has been the choice of more than 200,000 customers.
Our Enhanced Gravity Separator systems can be found inapplications ranging from the recovery ofprecious metals and base metalminerals, to upgrading industrial minerals. In addition previously untreatable coalfines & waste materials are able to be upgraded and cleaned without the use of chemicals. ThisMulti Gravity Separator will enhanced mineral separation for:
We are proud to build THE BIG MOZLEY Multi Gravity Separator, a machine that gives you the ability to subtly enhance gravity and thereby separate mineral grains with a 1 SG (Specific Gravity) unit difference down to 5 microns size. Because of our proven track record we work in partnership with some of the best laboratories in 98 countries to tailor our machines to your requirements.
Multi-Gravity or Enhanced Gravity Separation gives unrivalled efficiency in the continuous recovery and upgrading of mineral values contained in fine and ultra-fine particles. It is unique in enabling the production of high-grade concentrates at high recovery from low-grade tailings and middling streams. The operating principle may be likened to powerful, compact shaking tables. However, in the MGS the horizontal separating surface of a shaking table is wrapped into a conical drum which, when rapidly rotated, develops an enhanced gravitational field ideal for the recovery of ultra-fine heavy particles. Slurry is fed into the MGS towards the centre of each drum. Wash water is added close to the outer end. Heavy particles are separated from lighter particles within a dynamic thin film of water under a force many times greater than gravity alone, assisted by the shake motion.The heavy particles are pinned to the drum surface whilst the light, lower density, particles are carried away by the wash water to discharge at the tail outlet. The heavy particles are carried towards the outer end of the drum by a unique scraper system and discharge at the concentrate outlet. The wash water gives the concentrate a final wash before discharge.
Recovery of valuable fine mineral particles minerals is a difficult problem in mineral processing and particularly in gravity separation. With decreasing particle size (<100 ), the force associated with the water flow becomes dominant over that associated with gravity.
The MGS is effectively an enhanced gravity-shaking table. The table surface is folded forming a drum which on rotation creates variable centrifugal force or enhanced gravity. A sinusoidal shake is applied to this drum along its axis of variable amplitude and frequency. Under the effect of the centrifugal force, the heaviest particles penetrate the pulp film and are pinned against the inner surface of the drum where a series of scrapers drag these heavy minerals to the concentrate outlet.
Because the centrifugal force applied to the particles is far greater than the force of gravity exercised on a conventional shaking table, the separation between heavy and light minerals is in principle easier with the MGS Multi-Gravity Separator than with conventional equipment. Separation is effective where there is a 1 SG unit difference between the target mineral and gangue material.
The operating principle of the Multi-Gravity Separator is similar to that of a conventional shaking table, exceptthat centrifugal forces are used to enhance the separation of fine particles. In this system,feed slurry is distributed along the inner surface of a slightly tapered rotating drum. Light particles arecarried by the flowing film to the far end of the drum, while heavy particles pinned against the wall bythe centrifugal field are carried by rotating scrapers to the opposite end of the drum. A small amountof wash water is added to the heavies discharge end of the drum to wash out entrained low-densityparticles. Successful applications of the MGS technology include the concentration of cassiterite,chromite, wolfamite, graphite, mixed sulfides and gold.
Testing of a pilot-scale MGS unitwas recently completed for applicationsinvolving the desulfurization of fine coal. The results of thiswork showed that the pyritic sulfur rejection obtained by the MGS was nearly twice that achievedusing conventional fine particles processing techniques.
If you are unfamiliar with our gravity concentrators, our first recommendation is always laboratory test work. There is an excellent correlation between lab results and the industrial performance of our Concentrators.
There is no the same mine in the world, and every mine should choose its suitable technology scheme and equipment configuration. Xinhai Mining insists on the open-minded thoughts for every mine, customized its suitable technology and equipment, to create the ideal mine efficiency.
Currently, with the depletion of high-grade gold deposits, it is the global mainstream trend in researching the extraction technology of medium and low grade, refractory gold ore and strengthening traditional gold processing technology. At this point, Xinhai Mining has a long-term commitment to the research and revolution on gold processing method, technology, and equipment. Now Xinhai Mining has 28 kinds of innovative processing technologies for only gold.
2.Xinhai Mining separates according to the embeddedness, specific gravity difference, particle size, degree of mineral wealth, and degree of difficulty in mineral separation, improving the composite recovery rate of target mineral.3.Xinhai has digested and absorbed advanced and innovative ore dressing equipment at home and abroad, improved the processing capacity and effect of single equipment, and greatly reduced the equipment's floor area.02II.The ore processing process containing a large amount of high grade granular goldXinhai Innovation points:1.According to the basic principle of "recycle as soon as possible", Xinhai Mining adopts jigger + shaking table separation for coarse gold and spiral chute (or centrifugal concentrator) + shaking table separation for fine gold according to the results of original ore sieve analysis. All recoverable gold particles are basically recovered before the second stage grinding.2.Insisting on more crushing and less grinding principle, Xinhai Mining adopts the high-efficiency crushing equipment (cone crusher, high-pressure grinding roller, etc.) to reduce the grain size of crushing product as possible, and sets screen before the first stage grinding. The qualified grade products are screened to the gravity separation, reducing the load of grinding and avoid the over-grinding at the same time, which is harmful to the coarse gold gravity separation. At the same time, Xinhai Mining sets hydrocyclone before the second grinding, make sure the qualified particles separating in time and entering separation operation as soon as possible.03III.Laterite type gold mine/gold mine without chemicals(single gravity separation)Xinhai Innovation points:1.Till now, Xinhai Mining already completes several such projects in Africa. This kind of ore is similar in characteristic. All are laterite type gold deposits, the surface ore body weathering is serious, basically do not need to be broken, if the conventional mixing tank slurry, heavy wear impeller. For this, Xinhai Mining apples small size grinding equipment, and adding small size grinding steel balls, 2.In gravity separation, Xinhai Mining uses method of grading, separating coarse grain gold with jig and shaking table, fine grain gold with Nelson centrifugal separator and shaking table.3. To improve the composite recovery, Xinhai Mining scraping the shaking table concentrate with Nelson centrifugal separator and felt chute.
3.Xinhai has digested and absorbed advanced and innovative ore dressing equipment at home and abroad, improved the processing capacity and effect of single equipment, and greatly reduced the equipment's floor area.
1.According to the basic principle of "recycle as soon as possible", Xinhai Mining adopts jigger + shaking table separation for coarse gold and spiral chute (or centrifugal concentrator) + shaking table separation for fine gold according to the results of original ore sieve analysis. All recoverable gold particles are basically recovered before the second stage grinding.
2.Insisting on more crushing and less grinding principle, Xinhai Mining adopts the high-efficiency crushing equipment (cone crusher, high-pressure grinding roller, etc.) to reduce the grain size of crushing product as possible, and sets screen before the first stage grinding. The qualified grade products are screened to the gravity separation, reducing the load of grinding and avoid the over-grinding at the same time, which is harmful to the coarse gold gravity separation. At the same time, Xinhai Mining sets hydrocyclone before the second grinding, make sure the qualified particles separating in time and entering separation operation as soon as possible.
1.Till now, Xinhai Mining already completes several such projects in Africa. This kind of ore is similar in characteristic. All are laterite type gold deposits, the surface ore body weathering is serious, basically do not need to be broken, if the conventional mixing tank slurry, heavy wear impeller. For this, Xinhai Mining apples small size grinding equipment, and adding small size grinding steel balls,
1.On the basis of above advantages, Xinhai Mining insists on the principle, adding flash flotation unit after the first stage grinding. The high grade gold concentrate of flash flotation as product with the gold concentrate from the flotation after the second grinding.
In allusion to the ore different to separate, Xinhai Mining applies ultrafine grinding + multi-stage sorting to increase the recovery rate. Xinhai Mining applies the technology of fine grinding and flotation, and the middlings regrinding and reprocessing for the first concentrating middlings and the first scavenging concentrates. Thus, it is no need for all ores to grind to -325 mesh. Most concentrates can be recovered in the grain size -200 mesh. The regrinding and reprocessing of fine grain in high grade medium ore greatly reduced the regrinding cost and improved the comprehensive recovery rate.
The ore of this project is mainly oxidized ore, 80% of which is powdery clay ore, containing granular gold. The average grade of ore is 1.0g/t, with few impurities and gold as the only recoverable element.
The 80% of ore is powdery clay ore, with water content 25-30%. Xinhai Mining resolves the problems of easy plugging and feeding, on the other hand, applied the processing flow of gravity separation and cyanidation, strengthening the gravity separation and grinding flow. A part of particles of gold are recovered in gravity separation first, reducing the gold grade in leaching operation. The agent consumption is reduced and so is the processing production cost.
The ore mineral composition of this project is relatively simple, and the metal mineral is mainly pyrite. Non-metallic minerals are mainly quartz, calcite, mica, etc. The ore contains 4.70g/t gold, 4.63g/t silver, 20.10% iron and 20.55% sulfur. The recoverable element is only gold.
The grinding stage applies two stages closed grinding and classification. The grinding product screened by trash screen, and the undersize product flows to the thickener for thickening. The bottom flow of thickener pumps to the leaching operation. After leaching, adsorption and carbon extraction, the gold-bearing carbon products are obtained and transported to the original gold extraction plant for treatment. The leaching tailings are dehydrated by a press filter, recycled by the return water, and the dry tailings are transported to the tailings pond for stockpiling.
Considering that the gold grade of raw ore is as high as 6g/t, in order to avoid the loss of granular gold in the leaching system, a gravity separation system is added to the grinding grading circuit to recover granular gold as soon as possible, which provides a guarantee for the ideal gold recovery rate.
Two stage and one closed circuit crushing and screening - two stage closed circuit grinding - CIL and high-temperature high-pressure electrolysis desorption - high frequency furnace melting gold - tailing press filtering and dry stacking
Due to the change of ore properties in this project, the single gravity separation process adopted by the original weight separation plant is difficult to effectively recover the gold mine, and the technical indexes and economic benefits of the plant are quite unsatisfactory, so we decided to entrust xinhai Mining to build and transform it. On the basis of the original weight dressing plant, xinhai Mining adopts CIL process of gold mine, and the final gold leaching rate reaches 91.64% and carbon adsorption rate reaches 99.00%. The tailings dry drainage process makes the water content of tailings filter cake only 20%.
Prominer maintains a team of senior gold processing engineers with expertise and global experience. These gold professionals are specifically in gold processing through various beneficiation technologies, for gold ore of different characteristics, such as flotation, cyanide leaching, gravity separation, etc., to achieve the processing plant of optimal and cost-efficient process designs.
Based on abundant experiences on gold mining project, Prominer helps clients to get higher yield & recovery rate with lower running cost and pays more attention on environmental protection. Prominer supplies customized solution for different types of gold ore. General processing technologies for gold ore are summarized as below:
For alluvial gold, also called sand gold, gravel gold, placer gold or river gold, gravity separation is suitable. This type of gold contains mainly free gold blended with the sand. Under this circumstance, the technology is to wash away the mud and sieve out the big size stone first with the trommel screen, and then using centrifugal concentrator, shaking table as well as gold carpet to separate the free gold from the stone sands.
CIL is mainly for processing the oxide type gold ore if the recovery rate is not high or much gold is still left by using otation and/ or gravity circuits. Slurry, containing uncovered gold from primary circuits, is pumped directly to the thickener to adjust the slurry density. Then it is pumped to leaching plant and dissolved in aerated sodium cyanide solution. The solubilized gold is simultaneously adsorbed directly into coarse granules of activated carbon, and it is called Carbon-In-Leaching process (CIL).
Heap leaching is always the first choice to process low grade ore easy to leaching. Based on the leaching test, the gold ore will be crushed to the determined particle size and then sent to the dump area. If the content of clay and solid is high, to improve the leaching efficiency, the agglomeration shall be considered. By using the cement, lime and cyanide solution, the small particles would be stuck to big lumps. It makes the cyanide solution much easier penetrating and heap more stable. After sufficient leaching, the pregnant solution will be pumped to the carbon adsorption column for catching the free gold. The barren liquid will be pumped to the cyanide solution pond for recycle usage.
The loaded carbon is treated at high temperature to elute the adsorbed gold into the solution once again. The gold-rich eluate is fed into an electrowinning circuit where gold and other metals are plated onto cathodes of steel wool. The loaded steel wool is pretreated by calcination before mixing with uxes and melting. Finally, the melt is poured into a cascade of molds where gold is separated from the slag to gold bullion.
Prominer has been devoted to mineral processing industry for decades and specializes in mineral upgrading and deep processing. With expertise in the fields of mineral project development, mining, test study, engineering, technological processing.
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