51 results about "Gold leaching" patented technology

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 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.

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 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 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.

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.

The application provides a low-grade wrapped gold heavy medium enrichment, roasting and leaching process, and belongs to the field of mineral resources processing. The process comprises the following steps: S1, in a continuous suspension roasting system, under the conditions of a roasting temperature of 480-520 DEG C and an oxygen concentration of 8-12%, fine particle wrapped gold ore is subjected to suspension roasting to obtain roasted concentrate; S2, the roasted concentrate is subjected to two-stage ball milling to obtain ball mill slurry; S3, under the conditions of a ball mill slurry concentration of 40-50%, a temperature of 20-30 DEG C and a pH of 10.5-11.5, the ball mill slurry is subjected to leaching treatment by using a composite gold leaching agent to obtain leaching slurry. By constructing a whole-process collaborative system of "roasting pretreatment-milling connection-leaching adaptation", the process barriers between roasting and leaching are broken, a continuous optimal recovery environment is created for various types of fine particle wrapped gold, and the leaching rate, stability and economy of wrapped gold are simultaneously improved.

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 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 discloses a metal-based isocyanate gold leaching agent and a high-temperature catalytic synthesis method thereof. The high-temperature catalytic synthesis method of the metal-based isocyanate gold leaching agent comprises the following steps: grinding and uniformly mixing a proper amount of cyanate and a metal catalyst to obtain a mixture; carrying out high-temperature roasting on the mixture to obtain a roasted product; and the roasted product is naturally cooled and crushed, and the metal-based isocyanate gold leaching agent is obtained. According to the metal-based isocyanate gold leaching agent and the high-temperature catalytic synthesis method thereof, the synthesis raw materials are simple and easy to obtain, the cost is low, the synthesis process is simple and easy to control, the production efficiency is high, the energy consumption is low, and the metal-based isocyanate gold leaching agent has excellent gold leaching performance; the method can replace sodium cyanide to realize efficient gold leaching under the original cyaniding gold leaching process and equipment.

The invention provides a cyaniding gold leaching auxiliary and a gold leaching method, and belongs to the technical field of cyaniding gold leaching, and the cyaniding gold leaching auxiliary is composed of the following components of, by mass, 40-45% of ferric ammonium citrate, 40-50% of potassium ferrocyanide and 5-20% of sodium bicarbonate. According to the cyaniding gold leaching auxiliary, efficient gold leaching is achieved through the synergistic effect of the sodium bicarbonate, the ammonium ferric citrate and the potassium ferrocyanide, wherein the sodium bicarbonate stabilizes the pH and improves mass transfer; ferric ammonium citrate is complexed with impurity ions, and oxidation circulation is accelerated; potassium ferrocyanide doubly inhibits pyrite to reduce cyanide consumption; the three components form a closed-loop synergistic system which has the advantages of high efficiency, economy and environmental protection. Through the synergistic effect of the cyaniding gold leaching auxiliary agent and sodium cyanide, gold can be more effectively extracted from ore, and the leaching efficiency is improved.

The application provides a kind of gold-containing material gold extraction performance test method, and relates to gold resource dressing technical field.The method comprises the following steps: grinding the gold-containing material to be tested to a specified fineness, and obtaining parallel samples with uniform gold grade by size reduction;an oxygen-free ore pulp system is constructed;the initial concentration of exogenous gold is calculated according to the material grade and the preset leaching rate, and an oxygen-free exogenous gold cyanide solution matching the industrial conditions is prepared;two groups of parallel tests, pure adsorption group and activated carbon synchronous competition group, are set up, and the reaction is carried out synchronously under the same oxygen-free condition until adsorption equilibrium;the gold grade of the original ore sample and the two groups of test ore samples are measured respectively;the total adsorbed gold amount, irreversible gold extraction amount, reversible adsorbed gold amount and irreversible gold extraction rate are calculated according to the test analysis results, and the gold extraction performance test is completed.The systematic interference of gold leaching from the ore itself is eliminated from the root, and the method is suitable for accurate evaluation of gold extraction performance of various gold-containing materials such as gold ore, gold concentrate, roasted slag and oxidized slag.

The invention discloses a leaching method for iron oxide coated gold in calcine, which comprises the following steps: adding water into the calcine to obtain ore pulp, adding an iron leaching agent to adjust the system to be weakly acidic, leaching, carrying out solid-liquid separation to obtain iron-removed slag, adding water into the iron-removed slag to prepare the ore pulp, adding the iron leaching agent into the ore pulp, and carrying out solid-liquid separation on the ore pulp to obtain the iron oxide coated gold in the calcine, and adjusting the pH value of the ore pulp to be neutral or alkalescent, adding a gold leaching agent, and performing solid-liquid separation after leaching to obtain gold leaching residues and a gold-containing pregnant solution. According to the leaching method for the iron oxide wrapped gold in the calcine, the wrapped gold in the iron oxide phase can be fully opened, and the gold recovery rate is increased by 15%-20%.

The application discloses a low-toxicity and environment-friendly gold beneficiation method, which comprises the following steps: mixing gold ore with water to obtain slurry A, adding sodium citrate into the slurry A to obtain slurry B, grinding the slurry B to obtain slurry C, wherein the particle size of more than 90% of the ore powder particles in the slurry C is 50-100 mu m; adding a flotation agent into the slurry C to obtain rough selected ore, mixing the rough selected ore with water to obtain slurry D, adding ammonia water into the slurry D to adjust the pH value, adding a pretreatment agent into the slurry D to obtain fine selected ore after stirring and filtering, wherein the pretreatment agent comprises sodium persulfate, methyl isobutyl carbinol, low alcohol, sodium dodecyl sulfate and water; mixing the fine selected ore with water to obtain slurry E, adding a composite leaching agent into the slurry E to obtain leaching liquid, and obtaining gold mud from the leaching liquid by using a displacement method. The application solves the problem of difficult exposure of gold particles in the refractory gold ore, and improves the gold extraction efficiency by using the composite environment-friendly gold extraction agent for gold leaching.

The present application relates to a kind of gold leaching high-salt wastewater zero discharge treatment process and system, gold leaching high-salt wastewater zero discharge treatment process includes wastewater pretreatment, multistage filtration, membrane concentration and evaporation crystallization process;Wherein, wastewater pretreatment is used to remove most of suspended solids, hardness substance and heavy metal ions in gold leaching high-salt wastewater;Multistage filtration is used to remove small particles and organic pollutants in gold leaching high-salt wastewater;Membrane concentration is used to concentrate treatment to gold leaching high-salt wastewater;Evaporation crystallization is used to evaporate crystallization to the concentrated gold leaching high-salt wastewater, make the chloridion and sulphate in it into solid miscellaneous salt;The wastewater quality after evaporation crystallization reaches gold leaching process system reuse standard.The present application can effectively solve the problem that existing gold leaching high-salt wastewater treatment process pollutant is not completely removed, energy utilization rate is low, economic benefit and environmental protection are poor.

The application provides a gold ore cascade treatment method and relates to the technical field of non-ferrous metallurgy. The gold ore cascade treatment method comprises the following steps: carrying out one-stage roasting and two-stage roasting on antimony-containing gold ore to obtain two-stage roasting sand; carrying out selective alkali leaching treatment on the two-stage roasting sand, and obtaining antimony-containing leaching liquor and alkali leaching residue after solid-liquid separation; carrying out acid leaching treatment on the alkali leaching residue after vibration and grinding mechanical activation, and obtaining acid leaching residue and iron-containing solution after solid-liquid separation; and obtaining gold-containing leaching liquor after cyanide leaching treatment. The cascade treatment method highly couples two-stage roasting, selective alkali leaching, vibration and grinding activation and acid leaching. The mixed alkali liquor is used to realize efficient leaching and separation of antimony, and the problems of low antimony recovery rate and gold extraction interference are overcome. Through vibration and grinding mechanical activation and sulfuric acid leaching, the dense secondary coating layer of iron oxides caused by roasting is completely broken, and fine gold particles are fully exposed. The process significantly improves the reaction conditions of subsequent cyanidation, and greatly improves the final leaching rate and comprehensive recovery level of gold and antimony.

The application discloses application of guanidine functionalized microspheres to recovery of gold (I) in a thiosulfate solution and belongs to the technical field of precious metal recovery. In the application, a compound containing a guanidine functional group ((NH2)2C(=NH)) is used as a modifying reagent, chloromethylated polystyrene microspheres are used as a carrier, anhydrous sodium carbonate is used as an acid-binding agent, and dimethylformamide is used as a solvent, and an adsorbent containing the guanidine functional group is prepared through a nucleophilic substitution reaction. The guanidine functionalized microspheres prepared by the method can efficiently recover [Au(S2O3)2] 3‑ complex ions in a thiosulfate gold leaching solution and is not easy to be pulverized; the preparation of the adsorbent is simple and easy to implement and has low cost. In general, the material prepared in the application is an excellent adsorbent for recovery of gold (I) in a thiosulfate solution.