50 results about "Heap leaching" patented technology

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.

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.

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 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.

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.

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 application provides a quantitative analysis method for ore pore and fissure structure, and relates to the technical fields of mineral processing, metallurgical engineering and geological analysis. The method realizes accurate prediction of effective porosity of heap leaching ore by coupling on-site particle size investigation, laboratory "quasi on-site" heap construction, ore block fissure microscopic measurement and mass-volume conservation calculation. The method effectively overcomes the technical problems that the traditional method depends on single scale measurement, and is difficult to comprehensively reflect the complex structure from nanoscale pore to centimeter scale fissure, especially for the mixed ore of coarse and fine particle grades. The existing technology often processes different particle grades respectively, lacks systematic integration and mutual correction, and causes deviation of the calculation results of porosity and fissure rate.

This invention discloses a method and its application for regulating the oxidation and arsenic speciation transformation of arsenopyrite. The method involves sequentially adding arsenopyrite and pyrrhotite to an acidic, iron-free medium with an initial pH of 2.0 to form a protective galvanic cell coupling, followed by inoculation with *Thiobacillus ferrooxidans* and a shaking reaction. By adjusting the ratio of arsenopyrite to pyrrhotite and the addition of *Thiobacillus ferrooxidans*, the method achieves precise regulation of the oxidation of arsenopyrite and the arsenic speciation transformation through phased changes in arsenic release behavior and the As(III) / As(V) ratio. This method possesses dual application value in resource utilization and environmental remediation, and can be applied to the optimization of pretreatment processes for the biological oxidation of gold-bearing arsenic ores or the control of arsenic pollution migration and transformation in acidic mine wastewater, tailings heap leaching, and arsenic-containing sulfide ore coexisting scenarios.

The invention provides a quantitative analysis method for pore and fracture structures of ores, and relates to the technical field of mineral processing, metallurgical engineering and geological analysis. According to the method, accurate prediction of the effective porosity of the dump leaching ore is achieved by coupling on-site particle size investigation, laboratory'quasi-on-site 'pile body construction, ore block fracture microscopic measurement and mass-volume conservation calculation. The method effectively overcomes the defects that traditional methods mostly depend on single-scale measurement, complex structures from nano-scale pores to centimeter-scale cracks are difficult to comprehensively reflect, especially for ores with mixed coarse and fine particle fractions, different particle fractions are often treated in the prior art, system integration and mutual correction are lacked, and the measurement accuracy is poor. And the calculation results of the porosity and the fracture rate are deviated.

According to the ammonia-process dump leaching method for the copper oxide ore, ore is subjected to alkalization treatment in advance, so that metal ions such as calcium and magnesium are directly deposited in an ore heap, generation of precipitates in leachate is reduced, and the precipitates are prevented from blocking a pipeline. Ammonium salt and alkali slowly act in the ore heap, free ammonia molecules are released, continuous leaching of copper can be guaranteed, and ammonia volatilization loss is controlled. The surface of the ore heap is sealed, the ore heap with the ore particle size smaller than 10 mm is directly covered with a film, and the ore heap with the ore particle size larger than 10 mm is covered with river sand or river pebbles and then covered with a sealing film. A dripping liquid container, an intermediate liquid container, a qualified liquid container and a mixing and clarifying tank of an extraction device are arranged to be in a sealed state, raffinate returns to the dripping liquid container, and ammonia is recycled. By means of the method, economical and efficient development and utilization of the low-grade copper oxide ore can be achieved.

The invention provides a method and device for in-situ investigation of ore behaviors and indexes in the whole heap leaching process, and relates to the technical field of hydrometallurgy. The method comprises the steps that ore samples are selected from heap ores to prepare comprehensive ore samples; in the heap building process, column leaching devices are arranged in different areas in a heap body; sub-packaging the comprehensive ore sample into a plurality of column leaching devices to obtain a plurality of column leaching test units; spraying the heap body containing a plurality of column leaching test units so as to synchronously carry out a column leaching test in the heap leaching process; taking out the column leaching test units one by one in different periods in the heap leaching process; and analyzing the ore leaching residues in each column leaching test unit completing the leaching reaction in different stages to obtain technical indexes of ore samples, and representing the leaching behavior of the heaped ore. According to the method provided by the invention, the problem that the real reaction behavior and the physicochemical property change process of the ore material in the dump leaching process are difficult to comprehensively, continuously and in-situ reflect in the current investigation and analysis process is solved.

The invention discloses a method for heap leaching extraction of uranium and vanadium from organic matter-rich low-grade uranium-iron-vanadium polymetallic ore, and belongs to the technical field of hydrometallurgy. The method for heap leaching extraction of uranium and vanadium from the low-grade uranium-iron-vanadium polymetallic ore rich in organic matter comprises the steps that the low-grade uranium-iron-vanadium polymetallic ore is crushed, concentrated sulfuric acid is added for mixing, and an ore acid mixture is obtained; atomizing water, spraying the atomized water into the mineral acid mixture, and carrying out a pre-leaching reaction to obtain a primary treatment mixture; carrying out granulation treatment on the primary treatment mixture to obtain spherical ore grains; the spherical ore grains are subjected to film coating treatment and then subjected to constant-temperature curing, and a secondary treatment mixture is obtained; and heap building is conducted on the secondary treatment mixture, leaching treatment is conducted on the heap through a sulfuric acid solution, leaching liquid is collected, and uranium and vanadium in the leaching liquid are extracted and recycled. According to the method, all links are continuously connected, the technological process is shortened, the operation cost is reduced, and efficient leaching of uranium and vanadium in the low-grade uranium-iron-vanadium polymetallic ore is achieved.

The application provides a method and device for in-situ investigation of ore behavior and indexes in the whole heap leaching process, and relates to the technical field of hydrometallurgy. The method comprises the following steps: selecting ore samples from the ore to be stacked to obtain a comprehensive ore sample; setting column leaching devices in different regions of the heap during the stacking process; dividing the comprehensive ore sample into multiple column leaching devices to obtain multiple column leaching test units; spraying the heap containing the multiple column leaching test units to simultaneously carry out column leaching tests during the heap leaching process; taking out the column leaching test units one by one at different stages of the heap leaching process; analyzing the ore residues in each column leaching test unit that has completed leaching reaction at different stages to obtain technical indexes of the ore samples, which represent the leaching behavior of the ore to be stacked. Through the method provided by the application, the problem that the real reaction behavior of the ore material and the change process of the physical and chemical properties thereof in the heap leaching process cannot be comprehensively, continuously and in-situ reflected during the current investigation and analysis process is solved.

The invention discloses a method for measuring the porosity of ore, which belongs to the technical field of mineral processing and metallurgical engineering, and comprises the following steps: adopting a crushing process consistent with the industry, combining with multi-stage screening, and controlling samples of various size fractions to synchronously and naturally fall to the same point for coning at the same time length, so as to simulate the particle size distribution and natural repose angle state of real dump leaching; enabling the measured environment to fit an industrial ore stacking state; the method comprises the following steps: measuring a mineral composition mass fraction mi by combining automatic mineralogical analysis, and calculating a theoretical density rho theory through weighted summation, thereby avoiding deviation of a porosity calculation basis caused by estimating a theoretical volume by using an average density; a dense ore grinding sample is prepared, the pore correction coefficient K is calculated through epoxy resin impregnation for correction, the problem that the measurement accuracy is influenced due to the fact that a primary pore structure is damaged in the fine grinding sample grinding process is avoided, and then more accurate ore porosity measurement data are obtained.

The invention provides a biological pre-oxidation method for ore dump leaching and a method for leaching gold after biological pre-oxidation of gold-containing ore, which comprises the step of adopting heating and heat preservation measures in the biological pre-oxidation process, and particularly comprises the following steps of: heating a solution containing microorganisms and / or carrying out film coating and heat preservation on an ore heap, the temperature of biological pre-oxidation is controlled to be greater than or equal to 15 DEG C; the method has the advantages that microorganisms can keep high-efficiency oxidation activity, pyrite can be promoted to be quickly oxidized, the temperature of an ore heap can be increased by heat release in the pyrite oxidation process, accordingly, mutual promotion is formed to form forward circulation, the leaching rate of metal resources in the ore is increased, and efficient utilization of the metal resources in the low-grade difficult-to-treat ore is achieved; for the gold-bearing ore, the processes of secondary crushing, alkalifying and gold leaching are carried out after biological pre-oxidation, the problem of secondary wrapping of the gold-bearing ore in the biological pre-oxidation process is avoided, and the gold leaching rate is increased by 40% or above compared with a traditional direct gold leaching method.