301 results about "Heap leaching" patented technology

The invention discloses a method for reducing acid consumption during heap leaching and high-pressure leaching of nickel laterite ore, which combines the heap leaching technology with the high-pressure leaching technology to reduce acid consumption during the treatment of nickel laterite ore; residual sulfuric acid in coarse particle immersion of limonite heap is sufficiently utilized and sodium sulfate is added during the stage of high-pressure leaching so that sulfuric acid is generated while yellow natrojarosite is formed, thereby further reducing the consumption of sulfuric acid during the stage of high-pressure leaching.

A process is provided for the leaching of copper from chalcopyrite using ferric sulfate in which acceptable rates of leaching are achieved by controlling the surface potential of the chalcopyrite to an empirically determined "window" within the broad range of 350 to 450 mV. The most effective process conditions involve the selection of the said surface potential; the leach temperature; the pH of the leach solution; and the fineness of the grind of the chalcopyrite. The invention may be applied to both tank leaching and heap leaching processes.

The invention relates to a process for extracting gold from low-grade difficultly-treatable gold ore containing arsenic and carbon. The process is characterized in that: the gold ore has the characteristics of high clay mineral content, large fine ore amount after grinding, and the like. The process comprises the following steps of: grinding raw ore to 10 to -30 millimeters; sieving ore through a sample sieve of 1 to -2 millimeters or washing the ore with water so as to separate fine ore from the ore; floating gold concentrate by using the obtained fine ore; performing direct heap leaching on ore of +2 millimeter and performing biological oxidation; performing medium transformation such as acid washing, water washing, alkali washing and the like on the biologically-oxidized ore and cyaniding directly so as to extract gold, wherein gold is extracted from the floated gold concentrate by biological oxidation-cyaniding and carbon soaking-pressure oxidation-cyaniding and gold extraction or baking, oxidation and cyaniding. Due to the adoption of the process, the problem of permeability of gold ore is solved and the gold extracting rate is effectively increased from 2 to 5 percent during direct heap leaching and cyaniding to 55 to 65 percent. The process has the advantages of simple process, high gold extracting rate, low pollution, high benefit and the like.

The invention provides a heap-leaching method for separating copper and tin from tin-plated copper wires, belonging to the recovery processing of waste tin-plated copper wires. The method adopting thecopper sulfate replacement/heap-leaching method comprises the following steps: washing and stacking peeled waste tin-plated copper wires on an acid-proof and alkali-proof heap-leaching platform for heap-leaching; pickling the heap-leaching residue with recycling heap-leaching solution, and further washing the pickled heap-leaching residue to obtain detinned copper wires; adding hydrogen peroxideto the heap-leaching solution until no white precipitation is generated, heating the reaction solution until the reaction solution is boiling, standing, filtering, and drying to obtain original stannic acid, and further calcining the original stannic acid to obtain stannic oxide; adding a proper amount of copper powder and blowing air to the filtrate, wherein the addition amount of the copper power is the copper amount required by copper sulfate in the recycling heap-leaching solution; and controlling the temperature and time of the reaction and adjusting the concentrations of copper sulfate and sulfuric acid of the solution by sulfuric acid and water. The method has the advantages that the process is simple and easy-to-operate, the materials and devices are common and cheap, the tin-plated copper wires dispense with stirring in the heap-leaching process, the heap-leaching solution is recyclable and pollution-free, the removal rate of tin is higher than 95%, and the recovery rate of hydrogen peroxide immersion tin is higher than 98%.

The invention provides a wet copper extraction process used in high mud-content copper oxide ores of cold areas. The process comprises the following steps: crude ores are crushed and sieved, coarse fraction ores are sent to a storage yard for piling, fine fraction ores are sent to an ore washing system for washing and grading; placer ores are sent to the storage yard for the piling after washing the ores, and mud ores are sent to an agitation tank for agitation leaching; leaching solution which is obtained from heap leaching and agitation leaching processes is sent for extraction and stripping; stripping concentration solution is sent to an electrodeposition process, and a qualified cathode copper product is obtained; leached slag from the agitation leaching is neutralized and sent to a tailings reservoir for piling. The process has good permeability, fast copper leaching rate, and greatly improved copper leaching rate and leached copper yield per day by the grading and the heap leaching of the coarse fraction ores; and the copper leaching rate is improved and the ore utilization rate is greatly improved by the agitation leaching of minus 0.074mm size fraction ores. The method is applicable to the development and the application in the wet copper extraction process used in the high mud-content copper oxide ores of the cold areas, solves the difficult technical problems of poor bing permeability and slow copper leaching rate, widens the use range of copper ore resources and improves the comprehensive utilization rate of the copper.

The invention provides a new technique of acid heap leaching of copper oxide ore. The copper oxide ore is crushed and screened, then materials on a screen are carried out conventional acid heap leaching operation and the materials under the screen carry out concentration, size mixing and granulation and then are piled and leached; and leachate rich in copper ions is treated by the procedures of extraction, electrodeposition and the like so as to obtain cathode copper sold on the market. After the materials under the screen are concentrated, a binding agent needs to be added for size mixing; after size mixing, ore pulp and prepared acid-proof gravel with the granularity of 5mm to 25mm are mixed for granulation; in the granulation and heap leaching process, the pile height is 3 to 5m, in the heap leaching process, the concentration of dilute sulphuric acid is 0.1 to 2mol/L, the spraying strength is 0.2 to 0.5L/(min.m<2>) and the leaching period is 1 to 2 months. The technique can fully utilize copper oxide ore resource which is hard to be utilized in the past time, contains a large amount of clay mineral and is easy to argillization, improves the level of comprehensive utilization of mines, saves cost and increases profit. The invention is particularly suitable for being applied to the development of copper ore resources, mainly the copper oxide ore, which are hard to treat in all regions of China, in particular to remote regions of the western highlands.

The invention discloses a chemical and biological combining push soak craft of middle grade thermophile and low-grade primary cupric sulfide ore, which comprises the following steps: utilizing diluted sulfate liquor with Fe2+ ion; pre-processing low-grade primary cupric sulfide ore; choosing domestic middle grade thermophile (Sulfobacillus thermosulfidooxidans Retech-MTC-1) with reinforced sulfur oxidability; leaching primary cupric sulfide ore; reclaiming the copper; extracting leachate in pretreating step; entering organic phase into downstream back extraction process; extracting eligible leachate in middle grade thermophile step; backing the water phase to soaking pile; merging organic phase and the organic phase in pretreating step; entering into downstream back extraction process. This craft possesses short flow process, simple device, low coat and high reclaiming ratio, which can increase the reclaiming ratio of copper.

The invention discloses a selective heap leaching gold extraction process for gold mine containing copper, belonging to the field of hydrometallurgy. The process comprises the steps of: smashing and heaping gold mine containing copper; carrying out alkali treatment on the mine; then adding ammonium salt and sodium cyanide according to a certain proportion to realize the selective leaching of the gold and the restriction to the leaching of the copper; and finally absorbing and extracting the gold from leaching solution by conventional active carbon. The invention has the advantages of simple process method, short procedure, simple equipment, easy implementation, high gold leaching efficiency, low consumption of sodium cyanide, low energy consumption, little investment and low cost, and is the gold extraction method with easy realization of industrialized production and favorable economical benefit.

The invention discloses a method for wet-leaching lateritic-nickel ore at a transition layer. The method comprises the following steps: firstly washing lateritic-nickel ore at a transition layer so as to separate out limonite type lateritic-nickel ore and garnierite type lateritic-nickel ore; crushing and grading garnierite, sorting out ore with size fraction of 1-10mm for heap leaching to lixiviate metallic nickel, and mechanically grinding ore with particle size of less than 1mm into garnierite pulp with particle size of -100 meshes; adding concentrated sulfuric acid to limonite pulp for high-acid leaching under normal pressure; adding the garnierite pulp and nickel-containing solution subjected to heap leaching to the high-acid leaching pulp so as to neutralize residual acid; adding lime milk or limestone slurry for removing iron; and carrying out preliminary solid-liquid separation on the slurry without iron by utilizing a thickener, then finely filtering the slurry by utilizing apress filter, and further treating the obtained nickel-containing solution. The method has the advantages of simple flow, no need of ore pretreatment, the adoption of conventional leaching equipment,low acid consumption, good impurity removal effect, high nickel recovery rate and the like.

The present invention resides in a process of recovering nickel and cobalt, regenerating the main raw materials, said process including the steps of: granulometric separation; leaching; neutralization; MHP production in only one stage and the pressure crystallization of magnesium sulphite.

The process proposes a way to recovery nickel and cobalt from laterite ores through the atmospheric and heap leaching with staged addition of ore—by size separation—and H₂SO₄, decreasing the nickel losses and simplifying the neutralization circuit and producing a more purified MHP.

The present process route is employed for nickel extraction, including the one from high magnesium containing lateritic ores.

The ore separating method for raising the recovering rate of low-grade oxide gold and with high mud content and containnig coarse gold grain has the three kinds of technological process of heap leaching, gravitational separation and charcoal leaching combined. After crushing, washing ore, sieving, secondary crushing and twice grading, the coarse one grains enter heap leaching system directly white the fine ore grains enter the charcoal leaching system; preliminary vibration chute is set before the grading machine to retain coarse gold grains via gravitational separation. The said method has gold core recovering rate obviously higher than that of single heap leaching method and can utilize the precious resource fully.

A heap leaching method to recover copper from a primary copper sulphide mineral wherein the mineral is leached in an acidic chloride/sulphate solution in the presence of oxygen with the surface potential of the mineral below 600 mV (vs. SHE) to cause dissolution of the copper sulphide.

The invention relates to a method for producing tough cathode with cupric sludge. The method comprises the following processing steps: step 1, squeezing and dewatering: squeezing and dewatering cupric sewage; step 2, heap leaching or pickling: sprinkling acid solution on a columnar heap and feeding obtained heap leaching pregnant solution to an extraction system, or feeding squeezed and dewatered lump sludge to a pickling pool to pickle the squeezed and dewatered lump sludge with acid solution and feeding obtained pickling pregnant solution to the extraction system; step 3, extraction-reverse extraction: performing extraction on the heap leaching pregnant solution or the pickling pregnant solution obtained in the step 2, and performing reverse extraction on obtained loaded organic phase to obtain copper pregnant solution; step 4, electro-deposition: performing electro-deposition on the copper pregnant solution obtained in the step 3 under a copper condition to obtain tough cathode. The method has the advantages of low energy consumption, environmental friendliness, applicability to sludge with a low copper content, easiness in solid-liquid separation, high washing rate, high total recovery rate of copper, mature technology and the like and is applicable to industrial fields such as heavy mineral mining, non-ferrous metal smelting, machining and electroplating.

The invention provides a biological heap leaching technology for stripmining copper sulfide mines. The technology comprises the following steps: the copper sulfide mines with a low copper grade and high oxidizability are crushed, sieved and heaped, water and dilute sulphuric acids are dripped and sprinkled successively, a pH value is adjusted, then normal-temperature acidophile and middle-temperature acidophile are dripped and sprinkled successively according to temperature changes, and copper in leach liquor is displaced. The technology has the advantages that the technology is simple, the technological process is short, the pollution is small, the copper sulfide mines with a lower grade can be processed, and the like. Mineral leaching bacteria which are adopted are widely distributed, so that the mineral leaching bacteria are easy to obtain.

The invention discloses a multifunctional automatic control column leaching experimental facility, belonging to the field of leaching mining. The experimental facility mainly comprises a liquid circulation system, a water circulation system, an air circulation system, an automatic control system and a data collection system. The liquid circulation system is composed of a reaction column, a high-level tank and a liquid receiving tank; the water circulation system is composed of a hot water tank, a solenoid valve, a liquid receiving tank jacket, a reaction column jacket and a high-level tank jacket; the air circulation system is composed of an air compressor, an air flowmeter and a control valve; the automatic control system is used for automatically regulating and controlling the temperature of the leaching system, oxygen solubility and solution flowing; the data collection system can be used for automatically collecting and storing the solution pH value, the oxygen solubility, electric potential, the temperature and other parameters in real time. The experimental facility can be used for performing indoor simulation experiments and semi-industrial scale pilot plant experiments according to heap-leaching field conditions and actual size of mineral particles, effectively simulating the multiphase and multilevel seepage state of ore bulk and a microbiological leaching and biochemical process, and providing basic data for heap-leaching production practice and technological parameter optimization.

The invention provides a biological pre-oxidation treatment process of low-grade refractory gold ores or ore concentrate, which is a new process comprising the following steps: wrapping low-grade refractory ore concentrate on the surface of supporting ore particles, performing biological heap leaching preoxidation, washing and screening the slag, returning large particles to supplement supporting materials, and extracting gold from the gold ore concentrate-wrapped and pre-oxidized slag by cyanation. Bacteria are mixed bacteria mainly comprising Thiobacillus ferrooxidans, Thiobacillus thioxidans and Leptospirillum ferrooxidans, and the temperature is 30-45 DEG C; the particle sizes of the ore concentrate and the supporting ore are respectively 80-400 meshes and 10-30mm, and the wrapping thickness of the ore concentrate is less than 2mm; and the preoxidation period is 30-90 days, the preoxidation rate is increased to 50-70%, and the recovery rate of gold is up to 80-95%. Compared with biological stirring preoxidation and complete heap leaching preoxidation, the preoxidation treatment process provided by the invention solves the problems of long preoxidation period and low gold recovery rate, and has remarkable economic benefits. The process of the invention is especially suitable for gold ores with high content of pyrite, is environment-friendly, and is in line with the development of low-carbon economy in nonferrous metallurgy industry.

The invention provides an acid washed ore leaching process for low-grade copper oxide ores with high mud content, which comprises the following steps: after the raw ores are crushed and sieved, conveying the ores of +50mm size fraction to a storage yard for stacking, and carrying out acid washed ore treatment on the ores of -50mm size fraction; by adding sulfuric acid into the washing liquid, rewashing the ores to remove partial basic gangue; after the washing liquid is separated and deposited, recycling the acid liquid; after the ores are treated by an acid washed ore system, conveying the sand ores of +0.074mm size fraction to the storage yard for stacking, and stirring and leaching the mud ores of -0.074mm size fraction; after the leaching liquid generated by stirring and the leaching liquid generated by heap leaching are mixed, carrying out extracting and electrodepositing processes; and finally, obtaining cathode copper products. The process of the invention has the advantages of short procedures, simple equipment, small investment, low cost and little pollution to the environment, further solves the problems of poor heap leaching penetrability, low copper leaching rate and the like caused by existence of mud ores and dissolution and deposition of basic gangue, improves the recovery rate of copper, and comprehensively utilizes the mineral resources of the low-grade copper oxide with high mud content.

The invention relates to a method for leaching earthy oxide copper ores, in particular to a method for microorganism-pelleting heap leaching, and belongs to the technical field of hydrometallurgy. The method is characterized in that: the earthy ores are directly screened, and fine ores with the granularity of 1.5mm are added with strain acid water and cement to prepare ore pellets with the diameter between 10 and 20 mm for heap leaching, wherein the mass concentration of sulphuric acid in the strain acid water is 3 to 10 percent, strains are mixed strains of Thiobacillus ferrooxidans, Thiobacillus thiooxidans and Leptospirillum ferrooxidans, the mass ratio of the three is 4.0-5.5:2.5-3.5:1.5-2.5, the bacterial load ratio is 105 and 108/ml, the cement amount is 15 to 30kg/ton of ores; and leachate in the leaching is sprayed for closed cycle production. The method has the advantages of low investment, low energy consumption, good leaching effect, and no discharge of closed cycle, solves the problem of leaching the low-grade earthy oxide copper ores (including sulphide and oxide blend ores) by microorganism heap leaching, and overcomes the defects of long flow and high cost of agitation leaching.

An extraction method of Nickel and/or Cobalt comprises a heap leaching technology and a technology of atmospheric heating, mixing and leaching, which is characterized in that limonite type ore is leached by using the atmospheric heating and mixing, and serpentine type ore is leached by heap leaching technology. According to the invention, different leaching technology are adopted for the serpentine type ore and the limonite type ore in laterite-nickel ore, the serpentine type ore is leached by using the heap leaching technology to obtain the faster leaching speed, and the limonite type ore is leached by using the atmospheric heating and mixing technology for avoiding the problem of the extreme low leaching speed and the long leaching period.

The invention relates to mesophilic acidophilic bacteria and a biological heap leaching technology for low-grade cobaltiferous sulfide ore concentrates. The mesophilic acidophilic bacteria have a name of Thiobacillus ferrooxidans Retech V and a collection registration number of CCTCC NO: M202039, and has been stored and collected in China Center for Type Culture Collection (in Wuhan University). The biological heap leaching technology is that: mineral grains which are suitable for biological heap leaching are obtained after coating of crushed stones and solidification of the mineral grains of the low-grade cobaltiferous sulfur-bearing ore concentrates. Cobalt sulphates are obtained through procedures of embankment, heap leaching and trickling by adoption of bacteria with two different growth temperatures, lixivium circulation, purification and deferrization of cobalt pregnant solution, cobalt settlement and so on of the mineral grains. The temperature of 10 to 55 DEG C, the PH value of 1.2 to 1.8 and the adequate Fe concentration of a storage yard in a heap leaching system during the leaching out process are favorable for activity of leaching bacteria. The invention has the advantages of capability of fully utilizing low-grade cobaltiferous sulfide ore resources in old mines, improvement of comprehensive utilization level of mines, conservation of cost, and improvement of profit. The invention is applied in developing cobaltiferous sulfide ore resources in remote areas.

The invention provides a method for extracting vanadium by heap leaching and adding concentrated sulfuric acid and an additive in vanadium-containing stone coal. The method comprises the following specific steps: smashing stone coal ore; proportioning based on weight part, evenly mixing proportioned stone coal ore powder, concentrated sulfuric acid and an additive aqueous solution through mechanical stirring until small pellets are generated and piled to be in a cone shape, and reacting for 2-5 days; feeding the stone coal ore powder subjected to complete heap leaching reaction to an agitation leaching reaction kettle, adding water in a solid-liquid ratio of 1: (0.8-1.2) for mechanical agitation leaching; adding a reducer sodium thiosulfate for reduction, adding calcium carbonate to regulate the PH value, and carrying out solid-liquid separation in a belt filter or a plate-and-frame filter press so as to obtain a blue mother liquid containing vanadium; and extracting the mother liquidwith a solvent or carrying out ion exchange, vanadium precipitation, drying and forging on the mother liquid so as to obtain vanadium pentoxide. By using the method, the grinding cost of the ore is saved and reduced, and grinding equipment and capital construction installation investments are reduced.

The present invention provides a high intensity leaching method in initial heap leaching. The method comprises the steps of: first crushing uranium ore, separating fine fraction and transferring to a leaching field for heap construction; (2) leaching an ore heap by spray leaching agents; employing a leaching agent with high acidity in the initial leaching agent stage namely acidification stage, and spraying continuously 24 hours a day by high spray intensity; (3) adsorbing the leaching liquid obtained in step (2) to recover uranium, adding acid in the absorption tail liquid and returning to be reused as the leaching agent, and sending the saturated resin into a posttreatment process; (4) when the uranium concentration in the leaching liquid is less than 50mg / L or liquid metered leaching rate reaches 85%, conducting quasi tailings acid curing for a few days, washing the heap, returning the washing liquid to be used as leaching agent for the next heap, neutralizing the tailings and discharged the into a tailings storage. The heap leaching method provided by the invention can prevent the phenomena of ore wrapping by precipitates and leaching channel clogging in the acidification stage of ore heap, shorten leaching time and reduce tailings grade.