82 results about "Gold leaching" patented technology

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 relates to the technical field of precious metal recovery, in particular to a process for separating precious metal from copper-nickel smelting waste, which comprises the following steps: crushing and grading the waste, adding a sulfuric acid solution containing etidronic acid, leaching, and washing, drying and crushing filter residues to obtain a pretreated material; mixing the pretreated material with a sodium peroxide-sodium carbonate composite flux, roasting, leaching with water, and filtering to obtain a filter residue B; adding a leaching agent containing hydrochloric acid, sodium chlorate and 1, 2-cyclohexanediamine tetraacetic acid into the filter residue B according to the ratio of 1: 3-1: 5, and filtering to obtain filtrate C and filter residue C; adjusting the pH value of the filtrate C to 1.5-2.5, adding an ethanol solution of sodium N, N-diethyldithiocarbamate, precipitating, washing and calcining to obtain sponge palladium; adding ammonium chloride into the filtrate D, precipitating and calcining to obtain sponge platinum; and leaching the filter residue C by using a hydrochloric acid-chloroauric acid mixed solution containing diphenylthiourea, and replacing and calcining zinc powder to obtain crude gold. According to the process, the leaching rates of platinum, palladium and gold and the product purity are greatly improved; flux and reagent systems are optimized, consumption and energy consumption are reduced, waste liquid treatment is matched for up-to-standard discharge, and efficient resource recovery and environment-friendly cooperation are achieved.

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a pretreatment method for improving the leaching rate and the carbon adsorption rate of high-sulfur-arsenic gold ore. Comprising the following steps that the high-sulfur-arsenic gold ore is ground and then prepared into ore pulp; a green oxygen activating agent and hydrogen peroxide are sequentially added into the ore pulp, oxidation pretreatment is conducted on the high-sulfur-arsenic gold ore, ore pulp activating liquid is formed, and the green oxygen activating agent is a mixture of calcium oxide, sodium persulfate and soluble bivalent iron salt; and adding a gold leaching agent into the ore pulp activation solution, adjusting the pH value of the ore pulp to 9-12, carrying out stirring gold leaching treatment, filtering to obtain a leaching solution, and then adding activated carbon to adsorb and extract gold. According to the method, a stronger oxidation environment is provided, meanwhile, the residual concentration of arsenate radicals in the solution is effectively reduced, the leaching rate of gold and the adsorption rate of activated carbon are greatly increased, excellent oxidation performance and environment friendliness are shown, and a more sustainable high-sulfur-arsenic gold ore pretreatment process is provided.

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 belongs to the technical field of hydrometallurgy, and particularly relates to a pretreatment method for enhancing peroxide to improve the leaching rate of high-sulfur-arsenic gold ore. Comprising the following steps that the high-sulfur-arsenic gold ore is ground and then prepared into ore pulp; an oxidizing agent is added into the ore pulp, oxidation pretreatment is conducted on the high-sulfur-arsenic gold ore under the catalytic action of ultraviolet light, and ore pulp activation liquid is formed; and the pH of the ore pulp activating solution is adjusted to 9-12, a gold leaching agent is added into the ore pulp complexing solution, and stirring gold leaching treatment is conducted. According to the method, efficient oxidation of sulfide and arsenide is achieved under the mild condition through the synergistic effect of photocatalysis and chemical oxidation, the leaching rate of gold is remarkably increased, compared with a conventional peroxide oxidation method for pretreatment, the leaching rate can be increased by 10%-35%, and meanwhile the agent use amount and environmental pollution are reduced.

The invention provides a sulphide ore alkaline desulfurization and cyanidation gold leaching agent system and a method for extracting gold through the sulphide ore alkaline desulfurization and cyanidation gold leaching agent system, and belongs to the technical field of hydrometallurgy. According to the method, a ternary agent system consisting of potassium ferricyanide, low-concentration sodium cyanide and thioguanosine is constructed. An efficient'oxidation-inhibition 'synergistic system is formed between the auxiliary desulfurization agent potassium ferricyanide and the thioguanosine. The rapid and selective oxidation of potassium ferricyanide is smoothly carried out under the synergistic effect of thioguanosine, minerals are thoroughly decomposed, and the surface keeps high activity; meanwhile, due to the existence of the thioguanosine, the local microcell passivation risk and catalytic electron transfer can be eliminated more directionally. The sodium cyanide and the sodium cyanide complement each other, it is jointly guaranteed that the exposed gold can be smoothly and efficiently leached through follow-up low-concentration sodium cyanide, finally, the total consumption of reagents is reduced, environmental pollution is reduced, and meanwhile high-recovery-rate extraction of the gold in the sulfide ore difficult to treat is achieved.

The invention discloses a micro-fine particle gold ore normal-pressure alkaline leaching pretreatment method based on sodium percarbonate reinforcement, and belongs to the field of precious metal metallurgy. The method comprises the following steps: adding an oxidizing agent sodium percarbonate in batches under the condition that air is filled into ore pulp, starting to monitor the oxidation potential and the pH value of a reaction system after adding, judging that the reaction reaches the end point when the sudden drop amplitude of the oxidation potential of the ore pulp within one hour is greater than or equal to 30mV and the pH value is increased by 0.3-0.5 unit, and stopping aeration to finish pretreatment; in the segmented oxidation process, the oxidation potential is controlled within the range of + 520 mV to + 550 mV by dynamically adjusting the air charging rate. According to the basic technical scheme, the gold leaching rate reaches 86.01%, the gold leaching rate reaches up to 88.92% through the optimized technical scheme, and the utilization rate of gold ore resources is remarkably increased.

The invention relates to an environment-friendly gold leaching agent and a gold leaching method, and belongs to the technical field of gold leaching. The environment-friendly gold leaching agent comprises sodium cyanurate and guanidine salt. The gold leaching agent provided by the invention has a good gold leaching effect, is high in gold selectivity, does not contain traditional highly toxic sodium cyanide, is small in environmental pollution, and is green and environment-friendly.

The application discloses a method for improving recovery rate of extremely fine-grained gold ore by multi-process cooperation and belongs to the field of gold leaching by a wet method.According to different occurrence states of the extremely fine-grained gold ore, the application sequentially carries out phased and targeted recovery in the order of flotation, magnetic separation, alkali leaching pretreatment and cyanide leaching, or sequentially carries out phased and targeted recovery in the order of alkali leaching pretreatment, cyanide leaching, cyanide breaking, flotation and magnetic separation.Through the multi-process cooperative process, the application realizes phased and accurate recovery of gold in different occurrence states in the extremely fine-grained gold ore, significantly improves the total recovery rate of gold, and has the advantages of mild process, controllable cost and good environmental protection, thereby providing a new technical scheme for efficient recovery of extremely fine-grained refractory gold ore and having a wide industrial application prospect.

The invention discloses a method for green and efficient recovery of gold from refractory gold ore. The green and efficient gold recovery method for the refractory gold ore comprises the following steps that biological oxidation pretreatment is conducted on the refractory gold ore, and biological oxidation ore pulp is obtained; adjusting the pH value of the biological oxidation ore pulp, standing for 1-3 days to carry out bacterial inactivation on the biological oxidation ore pulp, then adding a proper amount of iron-based ligand to adjust the potential of the biological oxidation ore pulp to a proper range, and then adding a proper amount of thiosulfate to carry out in-situ leaching to obtain leached ore pulp; and the leaching ore pulp is filtered and separated, and gold leaching liquid and leaching residues are obtained. According to the method for green and efficient gold recovery from the refractory gold ore, a biological oxidation pretreatment method and a weakly acidic iron-based thiosulfate in-situ leaching process are combined, acid-base conversion of ore pulp is not needed, and green and efficient leaching of gold in the refractory gold ore can be achieved with the low production cost and the short process.

The application discloses a gold leaching method for pyrite-containing gold ore, and comprises the following steps: after the pyrite-containing gold ore is finely ground, water is added to obtain a slurry; a gold leaching reagent solution is added into the slurry to obtain a mixed leaching solution; the pH value of the mixed leaching solution is adjusted to alkaline, and leaching treatment is performed; and after filtration, a gold-containing leaching solution is obtained; the gold leaching reagent solution comprises polyphosphate, copper salt and thiosulfate; in the gold leaching reagent, polyphosphate is added; under alkaline conditions, polyphosphate ions can be selectively adsorbed or complexed on the surface active sites of pyrite to form a physical or chemical masking layer, thereby effectively blocking the direct contact of pyrite with dissolved oxygen and thiosulfate in the solution, inhibiting the catalytic decomposition of pyrite, significantly reducing the invalid consumption of thiosulfate, stabilizing the pH value and potential of the leaching system, and guaranteeing the efficient leaching of gold.

This application provides a method for extracting gold resources from urban minerals based on TEMPO electrocatalysis-histidine gold leaching reagent system, which belongs to the technical field of precious metal recycling. This method utilizes the original copper / iron impurities in discarded printed circuit boards to construct a Cu 2+ / Fe 3+ TEMPO redox coupled synergistic catalytic system. 2+ (E°=0.34 V vs SHE) and Fe 3+ (E°=0.77 V) with TEMPO + (E°=0.75 V) forms a step-by-step electron transport chain. TEMPO is precisely controlled by electric field + The electron transfer efficiency of the TEMPO redox couple (E° = 0.75 V vs. SHE) significantly increases the gold dissolution rate while reducing energy consumption and achieving a low impurity co-dissolution rate, enabling efficient and selective recovery of gold resources from electronic waste. This invention, through the TEMPO electrocatalytic-histidine chelation synergistic system, achieves efficient and selective extraction of gold from urban minerals, fundamentally addressing the key challenges of traditional cyanide-free gold extraction processes, such as high oxidant consumption, poor selectivity, and low efficiency.

The present invention discloses a method for eliminating the influence of associated calcium iron pyroxene in thiosulfate leaching process, and belongs to the field of hydrometallurgy. The specific process of the present invention is to first place the associated calcium iron pyroxene gold mine in a pretreatment solution containing sodium hydroxide, ammonium bifluoride or a mixture of the two and a mixture of sodium fluoride and acid for stirring pretreatment. Then, the treated mineral is placed in a copper ammonia thiosulfate solution for leaching, so as to reduce the consumption of thiosulfate and improve the leaching rate of gold in the associated calcium iron pyroxene gold mine; the present invention effectively solves the problem that thiosulfate leaching of the associated calcium iron pyroxene contained in the gold mine causes high thiosulfate consumption and low leaching rate of gold; it has the advantages of simple process, easy control, efficient gold leaching, etc.

In embodiments herein, a surface finish (SF) is formed on conductive contacts of a package substrate for connection to an embedded interconnect bridge circuit module die. In some embodiments, the SF may be electroless nickel plating and electroless palladium immersion gold (ENEPIG). In other embodiments, SF may be gold leaching electroless palladium leaching (IGEPIG). In other embodiments, the SF may include an electrolytic palladium gold layer on the indium layer or on the ferrocobalt layer.

The invention discloses a method for improving the recovery rate of ultra-micro-fine particle disseminated gold ore through multi-process cooperation, and belongs to the field of wet gold leaching. According to different occurrence states of the ultra-fine particle gold ore, staged and targeted recovery is sequentially carried out according to flotation, magnetic separation, alkaline leaching pretreatment and cyanidation leaching. Or sequentially performing staged and targeted recovery according to alkaline leaching pretreatment, cyanidation leaching, cyanide breaking, flotation and magnetic separation. According to the method, by means of a multi-process collaborative process, staged accurate recovery of gold in different occurrence states in the ultra-fine particle gold ore is achieved, the total recovery rate of gold is remarkably increased, the process is mild, the cost is controllable, the environmental protection property is good, a new technical scheme is provided for efficient recovery of the ultra-fine particle gold ore difficult to treat, and the method has wide industrial application prospects.

The invention relates to an environment-friendly gold leaching agent and an application method of the environment-friendly gold leaching agent in arsenic-containing refractory gold ore, and belongs to the technical field of hydrometallurgy. Preparing an auxiliary mixing agent from sodium carbonate and sodium sulfate according to a molar ratio of 4: 1 to 6: 1, and reacting for 2-4 hours at 200-300 DEG C under the action of excessive nitrogen to prepare a thiocyanogen complex; and cooling and crushing to obtain thiocyanogen complex powder. The effective cyanide concentration is 3%-5%, and cyanide volatilization and environmental pollution are remarkably reduced. According to the method, under the synergistic effect of biological pre-oxidation, the gold leaching efficiency is guaranteed, meanwhile, the unit dosage of sodium cyanide is remarkably reduced, the problems that a traditional cyanide method is high in toxicity and low in recovery rate of wrapped gold in the refractory gold ore are solved, and the method has high efficiency, environmental protection property and industrial feasibility and is suitable for green gold extraction of the high-arsenic and high-sulfur gold ore.

The application provides a method for gold leaching by means of a deep eutectic solvent system diaphragm electrolysis, and belongs to the field of electrochemical metallurgy. The method comprises the following steps: mixing and stirring choline chloride and ethylene glycol, adding halide and water to obtain a deep eutectic solvent electrolyte; mixing gold-containing materials with the deep eutectic solvent electrolyte, placing the mixture in an anode chamber of a diaphragm electrolytic cell, adding the deep eutectic solvent electrolyte in a cathode chamber of the diaphragm electrolytic cell, and applying direct current electrolysis; after the electrolysis is completed, performing solid-liquid separation on the materials in the anode chamber to obtain a gold-containing leaching solution. The deep eutectic solvent formed by choline chloride and ethylene glycol is used as a basic electrolyte, halide is added to provide active halogen ions for coordination, the viscosity is reduced and mass transfer is optimized by adjusting the water content, halogen oxidants are generated by anodic electrochemical oxidation in the diaphragm electrolytic cell, efficient leaching of gold in the gold-containing materials is realized, and effective isolation of anodic leaching and cathodic recovery is realized through the diaphragm.

The invention provides an amino acid co-enhanced gold leaching agent and a preparation method and application thereof, and belongs to the technical field of hydrometallurgy. The amino acid co-enhanced gold leaching agent provided by the invention comprises the following components in percentage by mass: 10-80% of amino acid, 1-50% of a sulfur-containing activator, 1-30% of a stabilizer, 1-30% of an oxidant, 1-10% of a complexing agent, 0.1-30% of a surfactant and 0.1-10% of a carrier. The gold leaching agent provided by the invention contains amino acid which can act together with the sulfur-containing activating agent to form a co-strengthening system, so that the gold leaching effect is improved. Results of the embodiment show that the gold leaching rate of the amino acid co-enhanced gold leaching agent is larger than or equal to 93%.

The application provides a high-sulfur arsenic carbon refractory gold concentrate boiling roasting system and method, and belongs to the technical field of mineral processing and metallurgy. The system comprises a four-furnace boiling roasting device and a flue gas recovery device. The four-furnace boiling roasting device comprises four furnaces connected in sequence and with decreasing horizontal heights. The bottoms of the four furnaces are respectively provided with four air chambers in communication with the furnaces. The first and fourth air chambers only pass in air, the second air chamber only passes in flue gas generated in the first furnace, and the third air chamber only passes in flue gas generated in the fourth furnace. The flue gas of the second and third furnaces is passed into the flue gas recovery device, which comprises a high-temperature carbon bed reactor, a realgar recovery device, a medium-temperature carbon bed reactor and a sulfur recovery device connected in sequence. The application reasonably designs the process and the equipment to recover sulfur and arsenic in the ore in the form of sulfur and realgar, has a small amount of flue gas emission, is beneficial to environmental protection, and is beneficial to improving the gold leaching rate of the refractory gold concentrate.

The invention discloses a technology for improving the leaching rate of micro-fine particle wrapped gold based on microwave and oxidizing agent combined pretreatment, and belongs to the technical field of gold extraction metallurgy. The process comprises the steps of ore pulp pretreatment, concentration and pulp mixing, composite oxidizing agent adding, microwave pretreatment, cyanidation leaching and the like. According to the method, the microwaves and the composite oxidizing agent are utilized, a microfine particle gold wrapping carrier is efficiently destroyed, the leaching rate of gold is increased to 85-92% from 45-55% of a traditional method, meanwhile, energy consumption is reduced by 40% or above, sulfur dioxide emission is avoided, and the method has the advantages of being efficient, low in consumption, environmentally friendly and the like and is particularly suitable for extraction of arsenic-containing, sulfur-containing, carbon-containing and other microfine particle wrapping type refractory gold ores.

The invention provides an ashing waste precious metal powder recovery device and a recovery method thereof, and relates to the technical field of precious metal powder industrial recovery. The recovery device comprises a waste conveying and feeding system, an air blower, a two-section type combustion ashing furnace, a tail gas absorption system, acid leaching gold dissolving equipment, a solid-liquid separator, powder reduction equipment and the like. According to the recovery method, a two-section ashing oxygen-controlled combustion strategy is adopted, efficient recovery of gold, silver, platinum and other precious metal products in wiping cloth, fiber filter materials, gloves and other ashing waste generated in the production process of precious metal powder and slurry is achieved, and meanwhile the industrial solid waste treatment problem is solved.

The present application relates to the technical field of rare and precious metal extraction, and particularly relates to a full-wet treatment process for silver anode slime without chlorine and without gold separation residue, which comprises the following steps: mixing silver anode slime with chlorine-free leaching agent, liquid-solid ratio is 8-12:1, leaching at 75-85 DEG C for 3-5h, after filtration separation, obtaining gold-containing leaching residue and silver-palladium-containing leaching solution; adding palladium precipitation reagent to the silver-palladium-containing leaching solution, adjusting pH value to 1.5-2.5, reacting at 55-65 DEG C for 1.5-2.5h, filtering to obtain palladium precipitate and palladium precipitation post-solution; adding silver precipitation reagent to the palladium precipitation post-solution, adjusting pH value to 2-3, reacting at 40-50 DEG C for 1-2h, reducing silver ions in the solution into silver element precipitate, filtering to obtain silver precipitate and silver precipitation post-solution; after dissolving the silver precipitate, adding it into silver electrolysis system to supplement electrolyte silver ions; at the same time, purifying the silver precipitation post-solution, removing impurity ions and recycling it as leaching agent; carrying out gold separation treatment on the gold-containing leaching residue, obtaining high-purity gold product. The present application completely avoids gold separation residue by abandoning chlorine-containing reagent throughout the whole process.

The invention relates to a method for enhancing the biological pre-oxidation gold extraction effect of high-arsenic low-sulfur gold concentrate in a high-altitude area. A method for enhancing the biological pre-oxidation gold extraction effect of high-arsenic low-sulfur gold concentrate in a high-altitude area comprises the following steps that (1) the high-arsenic low-sulfur gold concentrate is sequentially subjected to biological pre-oxidation and countercurrent washing treatment, and ore pulp is obtained; (2) adding an oxidizing agent into the ore pulp, and carrying out enhanced oxidation; and (3) lime is added into the ore pulp subjected to enhanced oxidation, after the ore pulp is adjusted to be alkaline, a golden cicada environment-friendly gold extraction agent and activated carbon are added, and the mixture is used for leaching gold. According to the method for strengthening the biological pre-oxidation gold extraction effect of the high-arsenic low-sulfur gold concentrate in the high-altitude area, the oxidizing agent matched with the technology is selected after the biological pre-oxidation technology, the oxidation effect of the gold-bearing minerals such as arsenopyrite and pyrite is further strengthened, wrapped gold in the gold-bearing minerals is fully opened, and the gold recovery rate is increased.

The invention discloses a method for increasing the leaching rate of refractory gold, and belongs to the technical field of hydrometallurgy. The method comprises the following steps: adding sodium persulfate, sodium percarbonate and ferrous chloride into ore pulp during alkali pretreatment; a gold leaching agent is introduced, the pH value of the ore pulp is adjusted to be within 9-12, gold leaching is conducted, and leaching of refractory gold is completed; the adding concentration of sodium persulfate is 0.01 mol / L-1 mol / L, the adding concentration of sodium percarbonate is 0.01 mol / L-0. 5 mol / L, and the adding amount of ferrous chloride is 50% of the adding amount of sodium persulfate. According to the method, high-activity free radicals are generated through sodium persulfate and sodium percarbonate under the alkaline condition, deep oxidation damage is conducted on an ore inclusion structure, and the leaching efficiency of gold is remarkably improved. Meanwhile, sodium carbonate generated by sodium percarbonate can stabilize the alkaline environment of the solution, the flowability of ore pulp and the contact efficiency of an oxidizing agent and mineral particles are improved, and the leaching efficiency of gold is improved.

The invention provides a leaching aid for cyanidation leaching and a leaching method, and belongs to the field of cyanidation gold leaching, the leaching aid is composed of the following components by the mass percentage: 50-80% of ammonium persulfate, 10-30% of potassium citrate, 5-10% of calcium peroxide, and 5-10% of ergothioneine. The leaching aid provided by the invention is added into a cyanidation leaching process, so that the leaching efficiency can be improved, the leaching time can be shortened, and the dosage of sodium cyanide can be reduced. Compared with a traditional leaching aid, the formula does not contain heavy metal, the risk of environmental pollution is reduced, and meanwhile, the combination of ammonium persulfate and calcium peroxide is more stable than a single oxidant and is not prone to decomposition and failure. The leaching aid has the advantages of oxidation enhancement, impurity inhibition, environmental friendliness and the like, can be widely applied to a cyaniding gold extraction process, and has a remarkable industrial application value.

The invention discloses a high-efficiency gold extraction method of low-gold pyrite, which comprises the following steps of: independently oxidizing and smelting the low-grade gold-containing pyrite by utilizing the metalloid property of molten ferrous sulfide, enriching valuable elements such as gold in the ore in a molten ferrous sulfide phase through selective slagging, and realizing the enrichment and recovery of valuable metals such as gold in the ore. The method is not limited by other auxiliary materials such as copper, lead and antimony, can be used for large-scale independent smelting treatment, and solves the problem that low-grade gold-containing pyrite in remote areas is difficult to dispose. After the low-gold pyrite is subjected to smelting pretreatment, flue gas can be used for preparing acid, the produced gold-rich ferrous sulfide phase is fed into a hot-pressing oxidation-cyaniding gold extraction system, pre-acidification treatment is not needed before hot-pressing oxidation, and the neutralization cost is greatly reduced. And after the oxidation liquid is neutralized by lime, neutralized slag can be returned to the smelting process for recycling, so that the smelting cost is reduced. The cyanidation gold leaching residues mainly comprise high-purity iron oxide, the iron grade is higher than 65%, the cyanidation gold leaching residues can be fed into an iron and steel plant to be treated, and efficient utilization of the iron element in the gold-containing pyrite is achieved.

The invention discloses a method for obtaining a sodium antimonate product based on two-stage circulating leaching, which comprises the following steps: primary sulfuration leaching: adding a sulfurizing agent into an antimony-containing material I under an alkaline condition, and carrying out primary sulfuration leaching to obtain antimony leaching liquid I and antimony leaching slag I; the antimony-containing material II is mixed with the antimony leaching liquid I under the alkaline condition, double-stage leaching is conducted, and double-stage antimony leaching liquid and double-stage antimony leaching slag are obtained; a vulcanizing agent is added into the double-stage antimony leaching slag under the alkaline condition, circulating vulcanization leaching is carried out, antimony leaching slag II and antimony leaching liquid II are obtained, and the antimony leaching liquid II is returned to double-stage leaching for double-stage leaching; oxidation antimony precipitation: mixing the two-stage antimony leaching liquid with an oxidizing agent, and carrying out oxidation reaction to obtain a sodium antimonate product. According to the method, gold leaching can be effectively inhibited without adding a complex inhibitor, meanwhile, gold is enriched in the antimony leaching slag to be recycled, the gold recovery rate can reach 99.6% or above, and the gold content in the sodium antimonate product can be reduced to 0.5 g / t or below.

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 invention relates to the field of mineral processing technology, specifically to a polymetallic ore beneficiation separation reagent, its preparation method, and its application. The preparation method of the polymetallic ore beneficiation separation reagent includes: mixing a nitrogen-containing compound, sodium hydroxide, and sodium carbonate, and heating the mixture to carry out a first catalytic reaction to obtain a first intermediate; the nitrogen-containing compound includes at least one selected from urea, biuret, and ammonium carbamate; mixing a cyanamide compound and sodium hydroxide, and carrying out a second catalytic reaction under a chlorine atmosphere to obtain a second intermediate; the cyanamide compound includes at least one selected from cyanamide, sodium dicyandiamide, and calcium cyanamide; mixing the first and second intermediates to obtain the polymetallic ore beneficiation separation reagent. The beneficiation separation reagent prepared by the method of this invention can achieve low-alkali separation of copper, sulfur, lead, and zinc, and gold leaching, possessing the advantages of being green, low-toxicity, and environmentally friendly, and also exhibiting better separation and leaching effects and higher concentrate quality.

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.