79 results about "Heap leaching" patented technology

The invention provides a method for detecting the porosity of ores in a dump leaching process, and belongs to the technical field of detection of the porosity of the ores. The method comprises the following steps: taking a dump leaching ore body, screening, uniformly mixing, splitting, putting into a dump leaching column to obtain the volume of a sample subjected to splitting in the dump leaching column, then performing fine grinding, putting into the dump leaching column to obtain the volume of the sample subjected to fine grinding in the dump leaching column, and then performing image analysis on the sample subjected to fine grinding to obtain the pore volume among sample particles subjected to fine grinding. And finally, converting the three volumes to obtain the porosity of the heap-leached ore. Through screening treatment, the sample representativeness is effectively improved; the ore before superfine grinding and after superfine grinding is introduced into a dump leaching column, the sampling uniformity is controlled, and the accuracy and stability of data are improved through the in-pile process under the same test column; an image analysis algorithm is introduced, and meanwhile, a correction coefficient is introduced, so that small pores among particles are precisely measured and calculated. The method is simple in process and convenient to operate, and the ore porosity can be rapidly and accurately measured and calculated.

The invention provides a dump leaching method for improving the leaching rate of gold ore, and belongs to the technical field of mineral processing. The method comprises the following steps: firstly, separating minerals into oversize products and undersize products; mixing sodium carboxymethyl cellulose, bentonite and ferrous sulfate to obtain a mixture, and granulating the undersize product by using the mixture as a binder; and mixing the undersize product particles with the oversize product, and carrying out cyanide-free dump leaching. According to the method, through graded granulation and heap building, the problem that heap building permeability is poor due to the fact that the gold ore contains many clay minerals is solved. In the granulation stage, ferrous hydroxide colloid generated by hydrolysis of ferrous sulfate in the binder can assist ore particle agglomeration, and particle stability is enhanced; during subsequent cyanide-free dump leaching, ferrous sulfate can be used as an auxiliary reducing agent and a catalyst in a thiourea gold leaching system to promote oxidation and dissolution of gold; meanwhile, ferrous ions can adjust the oxidation-reduction potential of a system, so that the thiourea gold leaching reaction is in a more favorable potential interval, the oxidation efficiency of thiourea is improved, invalid decomposition of thiourea is reduced, and therefore the use amount of thiourea and the use amount of agents are reduced.

The invention provides a low-cyanide gold leaching agent system and a dump leaching process thereof, and belongs to the technical field of hydrometallurgy. According to the method, a synergistic process of'interface activation, cyanide etching and iron precipitation inhibition 'is constructed by designing a low-cyanide gold leaching agent system. The amino acid auxiliary leaching agent adsorbs the gold surface to weaken lattice energy, so that the etching efficiency of trace cyanide ions is improved; mercapto-containing malic acid is used as a chelating agent, specific mercapto in molecules of the mercapto-containing malic acid and iron ions form an ultrahigh-stability water-soluble complex, generation of ferric hydroxide precipitates is thoroughly blocked, ferrous ions stabilized by the chelating agent are subjected to in-situ oxidation through dissolved oxygen and efficiently regenerated into potassium ferricyanide, and accumulation of free cyanogens in a solution system is eliminated; meanwhile, a chelating agent-iron complex forms a self-buffering pair, the pH of the dump leaching solution is accurately controlled, and secondary precipitation caused by local alkalization is prevented. According to the process, under the synergistic effect that the core chelating agent guarantees permeation stability and the leaching aid accelerates gold dissolution, the heap leaching period is compressed to 45 days.

The invention relates to the field of metallurgy and chemical engineering, in particular to a heap leaching gold extraction method for low-grade gold sulfide ore. Comprising the following steps that an anti-seepage bottom mat is laid on a dump leaching site; pre-treating the sulfide gold ore by using quick lime; ore crushing; ore is poured and piled on the upper portion of the bottom pad; spraying is conducted on the top of the ore heap and a side slope frame pipe, the gold-containing pregnant solution is collected, and the spraying solution is a sodium cyanide solution; and recovering gold from the gold-containing pregnant solution. According to the heap leaching gold extraction method provided by the invention, the quicklime is adopted to carry out pretreatment (iron removal, desulfurization and arsenic removal) on the sulfide gold ore, and then processes of subsequent ore crushing, heap building, spraying, adsorption and the like are carried out, so that the difficult problems of heap leaching utilization and popularization of low-grade sulfide ore resources are solved.

The invention discloses a method for analyzing the gold occurrence state of a dump leaching sample, and relates to the technical field of mineral processing and process mineralogy analysis. According to the analysis method, through the steps of sample preparation, gold grade calculation and representativeness verification, size grading and enrichment, stepped chemical leaching diagnosis, roasting dissociation and secondary leaching diagnosis, reselection enrichment and precise analysis, occurrence state calculation and the like, the means of reselection, leaching, roasting and the like are systematically combined with a mass balance mathematical model; accurate quantitative analysis of four critical occurrence states of coarse grain gold, leachable gold, wrapped gold and adsorbed gold in the heap leaching process is realized initiatively. The industrial problem that different occurrence states cannot be accurately quantified through a traditional method is solved, and direct and reliable data support is provided for accurate optimization and recovery rate improvement of the dump leaching process.

The invention relates to a method for regulating and deacidifying in a bioleaching process of low-grade copper sulphide ore, aiming at the problem of excessive acid caused by excessive oxidation of pyrite in a dump leaching system, a thiocyanate bactericide is added into the bioleaching system of the low-grade copper sulphide ore, and the thiocyanate bactericide is dissolved in a spray liquid of the bioleaching system, and is added into the spray liquid of the bioleaching system; under the catalytic action of mineral leaching microorganisms, oxidation of ferrous ions is enhanced, so that the oxidation-reduction potential of a solution is increased, oxidation of pyrite is intensified, acid accumulation is excessive, the thiocyanate bactericide can remarkably inhibit the activity of part of sulfur-oxidizing bacteria and even kill part of sulfur-oxidizing bacteria, and therefore the activity of ferrous oxide is reduced; compared with the prior art, the method has the advantages that the sulfur oxidation activity of microorganisms is greatly influenced, but the oxidation influence on iron is relatively small, so that the acid leaching is reduced under the condition that the copper leaching of the copper sulfide ore is not influenced, the copper leaching is not influenced, the acid leaching is reduced, the production cost is reduced, the environmental influence is reduced, and the like.

A system for dynamic oxidation of a heap of copper ore includes a “process island” for formulating and dispensing oxidizing reactive mixtures having predetermined compositions, and irrigating the heap with the mixtures to progressively transform the ore and maintain conditions for enhanced recovery of metal by heap leaching, solvent-extraction and electrowinning. In embodiments, the system is adapted to obtain copper metal from the refractory copper mineral chalcopyrite.

The application provides a heap leaching ore porosity analysis method and relates to the technical field of mineral processing and geological analysis. The analysis method associates material particle size composition, target element occurrence state and pore structure, can significantly improve the practicability of porosity evaluation, and thus overcomes the technical problem that the traditional method cannot reveal that the occurrence state and content distribution of target valuable elements in different particle sizes are significantly different, and then leads to the problem that different particle sizes do not contribute equally to the overall porosity.

This application relates to the field of heap leaching simulation devices, and more particularly to a heap leaching simulation device for efficient separation of impurities in phosphogypsum. The technical solution includes a modular heap leaching column, multi-layer independently controlled spray support components, a liquid supply system, a liquid return system, and a control unit. Each layer within the heap leaching column is equipped with independently operable spray components. The control unit can sequentially activate different spray levels from top to bottom or bottom to top, and return the leachate collected at the bottom to the top for re-rinsing. By having each layer of phosphogypsum sequentially act as the top, middle, and bottom layers in the circulation, the leachate repeatedly passes through multiple layers of phosphogypsum in various sequences, effectively eliminating the concentration gradient formed by the consumption of effective components and the accumulation of impurities during traditional drip leaching, achieving balanced impurity removal from each layer of phosphogypsum. This invention has advantages such as uniform impurity removal, high reagent utilization, and flexible operation, and is suitable for simulation research of phosphogypsum heap leaching impurity removal processes.

The present invention discloses a microbial remediation method for soil in rare earth heap leaching mines. The method comprises the following steps: mixing a composite microbial agent, distilled water, sucrose, potassium dihydrogen phosphate, magnesium sulfate, and sodium chloride to obtain a mixed solution A; adding modified zeolite to the mixed solution A and stirring to obtain a mixed solution B; adding chitosan to an acetic acid aqueous solution, followed by adding polyvinyl alcohol and stirring to obtain a mixed solution C; mixing Span 80 and liquid paraffin uniformly and heating to 40-50°C; then adding the mixed solution C under stirring; and then sequentially adding the mixed solution B and glutaraldehyde to the mixture and continuing to stir to obtain slow-release microspheres; mixing calcium hydroxide, water, polyethylene glycol, and the slow-release microspheres to obtain a soil conditioner; rinsing the mine soil with water for 1-2 days, turning the soil when the weather is clear, then drying it for 1-2 days and leveling the land, and then spraying the soil conditioner onto the soil. The present invention is suitable for the improvement and remediation of soil in rare earth heap leaching mines and has the characteristics of high applicability and good improvement and remediation effect.

This invention relates to a dynamic circulating gradient adsorption process and system for gold extraction from precious metal solutions, comprising: separating the precious metal solution into high, medium, and low grades; targeted calcium ion inhibition and synergistic scale inhibition treatment, which involves adding a composite agent of polyaspartic acid, sodium citrate, and carboxymethyl chitosan to the different grades of precious metal solutions to form soluble and stable complexes of free calcium ions in each solution, preventing scaling; and cross-group dynamic carbon circulating gradient adsorption, in which different grades of precious metal solutions are transferred to corresponding adsorption tower groups at different flow rates for activated carbon adsorption, and gold-loaded carbon is circulated across groups during adsorption to improve adsorption efficiency and shorten the adsorption cycle. The system includes multiple heap leaching fields, each connected to a No. 1, No. 2, and No. 3 precious metal solution pipe. This invention significantly improves the gold recovery rate from precious metal solutions, optimizes adsorption efficiency, and provides an efficient, economical, and environmentally friendly solution for heap leaching gold extraction.

The application discloses a method for recovering zinc and lead metals from lead-rich slag generated in a zinc smelting process, which comprises low-temperature acid leaching, magnetic separation, oxidation heap leaching, stirring leaching and the like processes, so that the lead-rich slag is subjected to low-temperature acid leaching and magnetic separation first, zinc compounds which are easily soluble are leached out sufficiently, and the content of iron ions entering the liquid phase is effectively reduced, thereby reducing the interference of iron ions in the zinc liquid, then the processes of oxidation heap leaching and stirring leaching are combined, and zinc ferrite and zinc sulfide minerals which are difficult to be acid-dissolved can be further dissolved, the zinc-containing substances basically enter the liquid phase, the target of separating lead and zinc is achieved, and finally, combined with dilute hydrochloric acid washing, part of calcium and silicon compounds can be dissolved, so that the lead grade in the final slag is improved, and comprehensive utilization is realized.

The low-grade nickel ore circulating heap leaching equipment provided in this invention includes: atmospheric pressure heap leaching pool, a number of acid pools corresponding one-to-one with the atmospheric pressure heap leaching pool, and an acid circulation structure. The discharge outlet of the atmospheric pressure heap leaching pool is connected to the acid pool, and the acid circulation structure is connected to the atmospheric pressure heap leaching pool and the acid pool. It is used to detect the nickel content in the acid pool and guide the liquid from a certain acid pool to a certain atmospheric pressure heap leaching pool based on the detection results. In this way, the circulating drip irrigation of acid solution can be realized to realize circulating leaching of nickel ore, so that the nickel in the acid solution can be gradually enriched, and the leaching of nickel can be realized without increasing the amount of acid solution, effectively reducing the treatment cost of low-grade nickel ore.

The application discloses a low grade nickel ore cycle leaching method and system, the method includes the following steps: the raw ore is divided into mud type ore and particle ore; The mud type ore is sent to several atmospheric pressure heap leaching pools, and the grain type ore is sent to atmospheric pressure stirring leaching pools. Drip irrigation of acid solution to multiple atmospheric pressure heap leaching pools and recovery of the leaching solution of each atmospheric pressure heap leaching pool; The nickel content concentration in the leaching solution of each atmospheric pressure heap leaching pool was detected. According to the nickel content concentration in the leaching solution of each atmospheric pressure heap leaching pool, the leaching solution of a certain atmospheric pressure heap leaching pool was drip-irrigated into another certain atmospheric pressure heap leaching pool. This application provides a low grade nickel ore cycle leaching system, including a ore washing module, a gravity beneficiation module, a churn leaching module and a heap leaching module. The low grade nickel ore cycle leaching method and system provided in this application can realize the cycle leaching of nickel ore and gradually enrich nickel in the acid solution. On the premise of not increasing the amount of acid solution, the nickel leaching can be realized and the processing cost of low grade nickel ore can be effectively reduced.

The invention belongs to the field of hydrometallurgy, and particularly relates to a weathering crust illuviation type rare earth ore screening system and a layered and graded rare earth heap leaching method. The system comprises a feeding device, a screening device, a conveying device, an ore heap, a liquid preparing pool and a liquid collecting pool which are sequentially arranged, and a cofferdam is arranged at the top of the ore heap. The method comprises the following steps: 1) after an ore heap is arranged by using weathering crust elution-deposited rare earth ore, spraying a composite ammonium solution in a solution preparation pool to the top of the ore heap through a spraying pipeline, and maintaining the liquid level height in a cofferdam at 5-10cm; (2) after the composite ammonium solution is sprayed, clear water is sprayed to the top of the ore heap through a spraying pipeline, water-soluble ammonium in the ore heap is flushed out, and the rare earth dump leaching process.By means of the method, the dump leaching efficiency of the weathering crust elution-deposited rare earth ore can be effectively improved, the ore leaching period is shortened, the rare earth leaching rate is increased, and the consumption of a leaching agent in the dump leaching process is reduced.

The invention provides a laboratory column leaching method, and belongs to the technical field of hydrometallurgy. According to the method, interference of fine-grained materials and coarse-grained gold on leaching is effectively eliminated through rigorous particle size separation and pretreatment steps, and the effect that the fine-grained materials are stacked and covered on the surface of deep leached ore along with a leaching agent in the simulated dump leaching process and the pressure borne by the deep ore are combined, so that the leaching efficiency of the deep leached ore is improved. The physical and chemical conditions of the deep ore in the dump leaching process are further simulated, the industrial dump leaching conditions are more truly reduced, the actual leaching rate of elements to be recycled in the ore in the actual dump leaching process is accurately evaluated, production is guided, and scientific data support is provided.

A method for heap leaching metals from ROM material containing metal sulfide-bearing materials, such as copper sulfide-bearing minerals. The method includes forming a heap of ROM material or expanding an existing heap by adding ROM material to the heap. The method also includes leaching metals from the ROM material in the heap using an acidic leach solution to produce a pregnant leach solution containing the metals in solution, and recovering the metals from the pregnant leach solution. Pyrite already present in the ROM material generates acid and heat to facilitate the leaching of metals from the ROM material. The ROM material may be transported directly from the mine to a stockpile without changing the size of the material particles in the ROM material. The method may also include adding additional pyrite and other additives to facilitate the leaching of metals.

The application provides a heap leaching process ore porosity detection method, and belongs to the technical field of ore porosity detection. The application takes heap leaching ore bodies, screens, mixes, divides, and then enters a heap leaching column to obtain the volume of the sample after division in the heap leaching column, then performs fine grinding, enters the heap leaching column again to obtain the volume of the sample after fine grinding in the heap leaching column, then performs image analysis on the sample after fine grinding to obtain the pore volume between the sample particles after fine grinding, and finally performs conversion through the three volumes to obtain the porosity of the heap leaching ore. Through screening treatment, the sample representativeness is effectively improved; the ore before and after superfine grinding is introduced into the heap leaching column, and the uniformity of sampling and the heap flow under the same test column are controlled, so that the accuracy and stability of data are improved; the image analysis algorithm is introduced, and a correction coefficient is introduced at the same time, so that the small pores between the particles are accurately calculated. The method has a simple process and convenient operation, and can quickly and accurately calculate the ore porosity.

The invention discloses a dripping liquid distribution method for uranium ore dump leaching in an arid region, and belongs to the technical field of uranium mining and metallurgy. The dripping liquid distribution method comprises the following steps: determining the row spacing and the spacing of drippers through an indoor experiment; a drop-leaching network comprising a main pipeline, a branch pipeline, drop-leaching branch pipes and an anti-blocking tail pipe is arranged on the top and the side slope of the ore heap; a variable-frequency pump is used for conveying leaching liquid and cooperates with a butterfly valve and a pressure control valve to regulate and control pressure; sediment is discharged through the anti-blocking tail pipe regularly, and back flushing is carried out to prevent blocking; and monitoring the liquid distribution uniformity and adjusting parameters by using infrared thermal imaging of the unmanned aerial vehicle. The method has the advantages of uniform liquid distribution, water loss as low as 4.7%, water saving, high efficiency, stable system operation, low dripper blockage risk and uranium leaching rate of over 80%, and is suitable for large-scale uranium ore dump leaching operation in drought, high-temperature and intense evaporation regions.

This application provides a bioleaching method for low-grade copper ore, comprising the following steps: crushing copper-bearing ore and pyrite separately, screening to obtain copper ore powder and iron ore powder, mixing the copper ore powder and iron ore powder and piling them in a heap leaching column, and burying vertical pipes in the heap to obtain a heap; spraying the heap with acid, then inoculating with leaching bacteria solution to carry out the heap leaching process; the leaching process uses raffinate for circulating leaching. The method of this application uses bioleaching to treat low-grade copper ore, which has the advantages of high leaching rate, low pollution, water conservation, and ease of operation. It overcomes the disadvantages of traditional flotation methods for separating low-grade copper ore, which are not only difficult to process but also have extremely low flotation yields, making it difficult to obtain high-grade copper concentrate.

The application provides a heap leaching method for improving leaching rate of gold ore, and belongs to the technical field of mineral processing. First, the mineral is separated into oversize and undersize; then the undersize is granulated by mixing sodium carboxymethyl cellulose, bentonite and ferrous sulfate as a binder; and then the undersize granules are mixed with the oversize and subjected to cyanide-free heap leaching. The method solves the problem of poor heap permeability of gold ore due to a large amount of clay minerals through staged granulation and stacking. In the granulation stage, the ferrous hydroxide colloid produced by the hydrolysis of ferrous sulfate in the binder can assist the agglomeration of ore granules and enhance the stability of the granules; in the subsequent cyanide-free heap leaching, in the thiourea gold leaching system, ferrous sulfate can act as an auxiliary reducing agent and a catalyst to promote the oxidation and dissolution of gold; at the same time, the ferrous ions can adjust the redox potential of the system, so that the thiourea gold leaching reaction is in a more favorable potential interval, the oxidation efficiency of thiourea is improved, the invalid decomposition of thiourea is reduced, and thus the dosage of thiourea and reagents is reduced.

This application provides a gold leaching reagent system and its heap leaching process for treating low-grade gold ore, belonging to the field of hydrometallurgy. The gold leaching reagent system includes a main leaching agent, a catalytic leaching agent, and a stabilizer; wherein the main leaching agent is glycine, the catalytic leaching agent is anhydrous sodium thiosulfate, and the stabilizer is an organic ammonium salt. This application constructs a ternary stable and synergistic system of sodium thiosulfate-glycine-organic ammonium salt by introducing an organic ammonium salt with a specific structure. This optimizes the traditional thiosulfate gold leaching process from both thermodynamic and kinetic perspectives. The organic ammonium salt cations can dynamically adsorb around the thiosulfate ions in solution through intermolecular interactions, forming an effective shielding layer. This significantly inhibits the side reaction of sodium thiosulfate being oxidized and decomposed into sulfate and other ineffective products by dissolved oxygen, maintaining the long-term stability of the effective components in the leachate. This gold leaching reagent system has comprehensive advantages such as high leaching efficiency, good reagent stability, environmental friendliness, and low operating costs.

A method for extracting copper from sulphide mineral ore, comprising the following steps: stacking the ore to form a pile (heap), a leaching step, irrigating the pile with a first irrigating solution containing an acidic nitrate solution and nitrite, thereby causing the oxidation of sulfide minerals inside the pile, oxidation of gaseous nitrogen oxide released during the oxidation of sulfide minerals inside the pile with oxygen to form nitrogen dioxide, and hydrolysis of nitrogen dioxide to form nitric acid and / or nitrous acid in the first irrigating solution inside the pile, to continue the leaching stage and reduce nitrogen oxide losses from the pile.

Microbial-assisted heap leaching of fragments or agglomerates of fragments of copper-containing sulfidic ores, such as chalcopyrite ores, and copper-containing sulfidic waste materials is disclosed. A heap leaching method includes controlling the sulfate concentration in a leach liquor. When heap leaching includes using agglomerates, a method of forming agglomerates includes adding the feed materials at, or close to, the inlet end, typically no more than 40%, typically no more than 30%, more typically no more than 20%, of the length from the inlet end of the agglomeration unit.

The application discloses a gold extraction process and device for low-grade gold ore and belongs to the technical field of gold extraction. The process comprises the following steps: S1, crushing and grinding and micro-granulation; S2, microwave-ultrasonic-steam blasting cooperative pretreatment; S3, cyanide-free composite leaching; S4, three-stage particle size grading countercurrent adsorption; S5, desorption electrolysis and carbon regeneration; S6, magnetic separation deep recovery; and S7, tailing treatment and water circulation. The gold extraction process and device have the advantages that the gold leaching rate is high, the gold leaching rate is 15-20 percent points higher than that of traditional heap leaching, the ton ore treatment cost is effectively reduced, cyanide is completely abandoned, the process is green and environment-friendly, the process is suitable for various ore types such as oxidized ore, sulfide ore and high-sulfur high-arsenic ore, the industrial feasibility is high, and remarkable economic and environmental benefits are achieved.

The utility model relates to the field of hydrometallurgy, in particular to methods for processing uranium-containing ores, and can be used in the extraction of scandium as a valuable by-product in the processes of underground and heap leaching of uranium, as well as in the processing of process solutions from uranium production. The proposed method can be used at mining and metallurgical enterprises specializing in the extraction and processing of uranium raw materials, as well as in the complex processing of mineral raw materials with the extraction of rare and rare earth elements. The objective of the utility model is to develop a method for extracting scandium from uranium-containing ores, ensuring an increase in the degree of scandium extraction due to a more complete involvement of both readily soluble (epigenetic) and poorly soluble (syngenetic) forms of scandium, as well as the intensification of the leaching process while maintaining technological simplicity and the possibility of using circulating solutions. The technical result of the utility model is to increase the degree of scandium extraction from uranium-containing ores by carrying out the leaching process in two successive stages with different concentrations of sulfuric acid, which ensures the selective extraction of first readily soluble and then poorly soluble forms of scandium, as well as increasing the efficiency of using the leaching reagent by using the mother uranium sorption solution with its additional strengthening with sulfuric acid and conducting the process in a cyclic mode. The technical result is achieved by a method for extracting scandium from uranium-containing ores, including sulfuric acid leaching with mixing in a cyclic mode with the return of the solution, in which the leaching reagent is a mother solution of uranium sorption, further strengthened with sulfuric acid, followed by filtration of the pulp after the completion of the leaching process. According to the utility model, leaching is carried out in two successive stages at a solid:liquid ratio of 1:2-1:3, wherein at the first stage leaching is carried out at a sulfuric acid concentration of 16-20 g / dm3 for 3.5-4 hours to extract predominantly readily soluble forms of scandium, after which the resulting solid residue is separated and subjected to a second stage of leaching, which is carried out at an increased sulfuric acid concentration of 20-50 g / dm3 also for 3.5-4 hours.

The utility model belongs to the technical field of laterite nickel ore atmospheric pressure leaching, and discloses a low-quality nickel ore circulation leaching system which comprises a dump leaching module and a stirring leaching module. The heap leaching module comprises a plurality of normal-pressure heap leaching pools, a plurality of acid liquor pools and a plurality of acid liquor circulating structures, heap leaching mineral aggregates are arranged in the plurality of normal-pressure heap leaching pools, and the plurality of acid liquor pools are communicated with the plurality of normal-pressure heap leaching pools in a one-to-one correspondence manner, so that acid liquor in the normal-pressure heap leaching pools can flow back into the corresponding acid liquor pools; the acid liquor circulating structure is used for connecting the plurality of normal-pressure dump leaching pools and the plurality of acid liquor pools, and the acid liquor circulating structure can be used for detecting the nickel content in the acid liquor in the plurality of acid liquor pools and guiding the acid liquor in the acid liquor pools into the corresponding plurality of normal-pressure dump leaching pools according to a detection result. According to the heap leaching module, circulating drip irrigation of the acid liquor is achieved, circulating leaching of the nickel ore is achieved, nickel in the acid liquor is gradually enriched, on the premise that the usage amount of the acid liquor is not increased, leaching of the nickel is effectively achieved, and the treatment cost of the low-quality nickel ore is reduced.

The invention relates to a low-grade gold ore heap leaching method. The method comprises the following steps: crushing and grading ores into four particle sizes of coarse, medium, fine and fine silt; respectively adding a compound additive containing ferrous sulfate, potassium citrate, citric acid and sodium citrate into the fine particle grade and the fine silt grade, and granulating to realize iron pre-activation and potassium source presetting; adopting a three-layer reversed-order gradient heap building with a coarse fraction as a bottom layer, a medium fraction and a part of granulation particles as a middle layer and the rest granulation particles as an upper layer; a potassium ferricyanide circulating system with concentrated spraying on the upper layer, targeted liquid supplementing on the middle layer and aeration regeneration on the bottom layer is established, and pre-activated Fe < 2 + > on the upper layer is utilized to generate part of potassium ferricyanide in situ to selectively oxidize arsenopyrite. According to the method, iron sources of ores and ferrous sulfate are used for supplementing iron in a low-price mode, cyclic regeneration is combined with potassium ferricyanide, agent consumption and cost are greatly reduced, harm reduction of arsenic is achieved, and the method has the advantages of being high in gold leaching rate, short in leaching period, environmentally friendly, low in comprehensive cost and the like.

The invention relates to a pregnant solution quality-dividing and flow-dividing dynamic circulation cascade adsorption gold extraction process and a system thereof, and the process comprises the following steps: carrying out quality-dividing and flow-dividing on a pregnant solution, and dividing the pregnant solution into three grades of high grade, medium grade and low grade; calcium ion targeted inhibition synergistic scale inhibition treatment is carried out, and a polyaspartic acid, sodium citrate and carboxymethyl chitosan composite reagent is added into different grades of pregnant solutions, so that free calcium ions in the pregnant solutions form a soluble stable complex, and scaling is prevented; according to cross-group dynamic carbon circulation gradient adsorption, pregnant solutions of different grades are transferred into corresponding adsorption tower groups at different flow speeds to be subjected to activated carbon adsorption, cross-group scheduling circulation of gold-loaded carbon is performed in the adsorption process, the adsorption efficiency is improved, and the adsorption period is shortened. The system comprises a plurality of heap leaching fields, and each heap leaching field is connected with a first pregnant solution pipe, a second pregnant solution pipe and a third pregnant solution pipe. According to the method, the recovery rate of gold in the pregnant solution is remarkably increased, the adsorption efficiency is optimized, and an efficient, economical and environment-friendly solution is provided for the heap leaching gold extraction process.