85 results about "Gold extraction" patented technology

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 provides a flotation pretreatment reagent system and a method for treating gold-bearing waste soot and recycling gold through the flotation pretreatment reagent system, and belongs to the technical field of hydrometallurgy. According to the invention, a multi-agent synergistic agent system is designed, a gold recovery system of'catalytic oxidation-bridging anchoring-hydrophobic flotation 'is constructed, and strategy transformation from passive inhibition of carbon adsorption to active separation of a carbon carrier is successfully realized. Compared with a traditional method which only tries to passivate the adsorption activity of carbon, the method has the advantages that gold-robbing carbon interfering with gold recovery is converted into a flotation carrier easy to separate through accurate reagent matching, and the problem that carbonaceous interferes with cyaniding gold extraction is fundamentally solved. The modified carbon agglomerates are subjected to efficient flotation separation due to the excellent hydrophobic characteristic, and the gold is enriched in the tailings due to the fact that the gold is not hydrophobized. According to the method, the gold recovery rate of follow-up cyanidation leaching is remarkably increased, the agent consumption is greatly reduced, and the important technical value of achieving technological process innovation through molecular-level collaborative design is shown.

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 relates to a method for recovering valuable components from high-copper and high-iron complex gold extraction broken carbon roasting slag. The method comprises the following steps: grinding and grading: grinding and grading a material to be treated into a fine material with the particle size of-0.074 mm accounting for 70%-80%; flotation decarburization is conducted, specifically, primary roughing is conducted on the fine material slurry, carbon-containing concentrate and tailings are obtained, and the carbon-containing concentrate is returned to an original roasting ashing system to be roasted again to obtain concentrate roasting slag; selective leaching of copper: feeding the tailings and the concentrate roasting slag into an ammonia-chlorine solution for pre-leaching to obtain copper-containing leaching liquid and leaching slag; first-stage preferential leaching is conducted, specifically, the leaching residues are fed into a cyaniding system to be subjected to first-stage preferential leaching, and a gold and silver pregnant solution and first-stage leaching residues are obtained; second-stage intensified leaching is conducted, specifically, the first-stage leaching residues are subjected to second-stage intensified leaching, and gold and silver pregnant solution and second-stage leaching residues are obtained; and recovery of element copper: conveying the copper-containing immersion liquid to a copper recovery system for distillation to obtain ammonia water and a copper hydroxide precipitate. According to the method, efficient comprehensive recovery of gold, silver and copper in the high-copper-iron complex gold extraction broken carbon roasting slag is achieved.

The invention provides a green gold extraction system adopting a microorganism air synergistic oxidation method, and relates to the technical field of microorganism gold extraction. The system is mainly composed of a photovoltaic power generation and energy storage power station, an oxidation air compressor, an air conditioner, a stirring air compressor, a multi-stage gas oxidizer, a tail gas absorption mechanism and the like. Under the condition that the requirement for the gold extraction effect of microbial oxidation pretreatment is met, the whole system abandons a complex mechanical structure of a heat exchanger and a turbulent flow plate arranged in a traditional mechanical stirring tank, air oxidation, air heat exchange and multi-stage air replacement stirring are adopted, and the problems of dissolved oxygen amount, temperature and homogenization which need to be controlled by microbial oxidation are solved. In addition, due to the large-diameter design of the closed normal-pressure oxidation tower body, the oxygen utilization rate is high, and heat dissipation of the tower body is good; no complex heat exchanger system and mechanical transmission are arranged inside, so that mechanical faults and maintenance difficulty are reduced, energy consumption is reduced, the structure is simple, and investment is reduced.

The invention provides a preparation method and application of a modified PVC adsorbent for gold extraction of carbonaceous gold ore, and belongs to the technical field of organic polymer materials and resource utilization. Based on construction of a hydroxylation-xanthate esterification reaction and bifunctional adsorption sites, a series of chemical modification paths of acetate nucleophilic substitution-hydrolysis-carbon disulfide alkali treatment are established, and xanthate functional groups with high reaction activity are accurately constructed on an inert PVC framework. Sulfur atoms in xanthate groups of the modified PVC are excellent electron donors and can generate strong chemical adsorption with metal impurities or polar sites on the surface of carbon, meanwhile, Van der Waals interaction between a main chain of the modified PVC and the carbon is reserved, and unmodified PVC or single hydroxylated PVC does not have the synergism of chemical adsorption and physical adsorption, so that the modified PVC can be used for preparing the carbon-modified PVC composite material, and the carbon-modified PVC composite material can be used for preparing the carbon-modified PVC composite material. And leap-type improvement of the adsorption capacity and selectivity of organic carbonaceous in minerals is realized.

The invention discloses a non-aqua regia gold extraction agent and method for recovering precious metal from waste containing precious metal. The non-aqua regia gold extraction agent is composed of nitrate, metal chloride and weak acid, by precisely regulating and controlling the concentrations of nitrate, chloride ions and hydrogen ions in the non-aqua regia gold extraction agent, the precious metal in the waste containing the precious metal can be subjected to green, efficient and selective oxidation leaching under the normal temperature condition, the precious metal ions in the leaching solution are subjected to reduction operation, and therefore the recovery rate of the precious metal in the waste containing the precious metal is improved. And a pure noble metal product can be obtained. Compared with a traditional aqua regia method, the method has the advantages that strong acid reagents such as concentrated nitric acid and concentrated hydrochloric acid are not used, corrosion to equipment and operation risks are remarkably reduced, and secondary emission of harmful gas is avoided. The method has the remarkable advantages of being environmentally friendly, easy and convenient to operate, mild in reaction condition, low in equipment requirement, high in leaching rate and the like, is suitable for large-scale and industrial production, and has wide application prospects and commercial value in the field of precious metal recovery.

The invention belongs to the technical field of gold extraction, and provides a method for rapidly extracting elemental gold by using'hydrocarbon-water 'interface microdroplets. The method comprises the following steps: preparing a quartz capillary reaction tube; injecting a sample; sequentially inserting fine capillary syringes filled with a HAuCl4 aqueous solution and a hydrocarbon liquid into the quartz capillary reaction tube, injecting the HAuCl4 aqueous solution and the hydrocarbon liquid, fixing the quartz capillary reaction tube, and extracting the elemental gold. According to the method, a large number of liquid drops formed in the high-temperature and high-pressure capillary tube are used for reducing the gold-containing fluid to form gold precipitates, by adjusting the temperature and pressure conditions of a hydrocarbon-water interface in the quartz capillary tube, generation of a large number of micro-liquid drops near the interface and micro-liquid drops in hydrocarbon is promoted, and the gold precipitates in the gold-containing fluid are reduced by means of the property of the water micro-liquid drops; the problems that an existing gold extraction technology is low in efficiency, poor in selectivity, high in cost, environment-friendly and the like are solved.

The invention relates to the technical field of resource recovery, and provides a novel method for efficiently extracting gold. The method provided by the invention comprises the following steps: mixing tridecane and a gold-containing solution, forming micro-droplets under the ultrasonic action, and extracting Au (III) in the gold-containing solution. Au (III) in water is reduced through superoxide free radicals and electrons generated on the micro-liquid drop-oil interface under the ultrasonic action to generate Au (0) precipitates, and therefore efficient extraction of Au (III) is achieved. The method provided by the invention only needs to use commercially available tridecane and ultrasound as unique energy sources, and has the remarkable advantages of simplicity and convenience in operation, low cost and no secondary pollution. Results of the embodiment show that the method provided by the invention has a good removal effect on gold-containing solutions with the concentration of 0.01-1 mM and the pH value of 1-10, and the removal rate of gold can reach 95% or above.

The invention discloses a method for recovering fine-crushed gold-loaded resin from gold ore leaching residues, and belongs to the technical field of mineral processing. The invention provides an efficient recovery method aiming at the problem of resource waste caused by loss of fine-crushed gold-loaded resin along with leaching residues in the gold extraction process of a resin ore pulp method. The gold ore tailings mainly comprise silicate minerals such as quartz, feldspar and mica, the granularity is fine, and the viscosity of ore pulp is high. The method comprises the following steps: carrying out size mixing and dispersion pretreatment on the tailings containing the fine-crushed gold-loaded resin; gold-bearing resin rough concentrate is obtained through screening and grading; the rough concentrate is subjected to desliming pretreatment; the deslimed materials are subjected to dense medium separation and concentration, and efficient separation is achieved through the density difference between resin and gangue minerals; and finally, the obtained gold-bearing resin concentrate is subjected to medium drainage washing. The sorting technology adopted by the invention has the advantages of high separation precision, strong adaptability and the like, can realize efficient recovery of fine-crushed gold-loaded resin from a complex tailing system, and has remarkable economic benefits and environmental benefits.

The application discloses a kind of short process gold extraction devices of waste printed circuit board.It includes separation module, collection module and electrodeposition part.Separation module contains leaching tank, and leaching liquid and cleaning liquid are alternately introduced, and leaching process is strengthened using micro-bubble generator and heater, so that gold foil is stripped from the surface of circuit board;Collection module contains filter and temporary storage tank, for intercepting and collecting gold foil and classifying temporary storage liquid;Electrodeposition part is connected to temporary storage tank, and copper in leaching solution is recovered through electrodeposition tank, and tail liquid flows back to leaching tank to realize closed circuit circulation.The application adopts integrated design, and combines selective leaching and physical interception by micro-bubble strengthening, without complex high-temperature or cyanide equipment, and one step realizes efficient stripping of gold and electrolytic recovery of copper;At the same time, leaching solution is closed circuit, and cleaning liquid is recovered in stages, which significantly shortens the process flow, reduces equipment investment and environmental pollution.

The invention relates to the technical field of mineral processing and environment-friendly chemical agents, in particular to a novel environment-friendly gold extraction agent and a preparation method thereof. The method aims at solving the problems that in existing gold hydrometallurgy, a traditional cyanide gold extraction agent is highly toxic and pollutes the environment, and the environment-friendly gold extraction agent is insufficient in the aspects of leaching efficiency, preparation and application convenience, energy consumption and universality. The method is characterized by comprising the following steps: mixing a bio-based organic complexing agent aqueous solution with the weight-average molecular weight of 500-2000 with an oxidizing agent, adjusting the pH value, adding an inorganic salt auxiliary agent, heating for reaction, and finally carrying out spray drying to obtain the powdery gold extraction agent. By the adoption of the technical scheme, the effects of being environmentally friendly, low in toxicity, high in leaching efficiency, high in universality to complex ore, low in preparation energy consumption, rapid in product dissolution, convenient and fast to apply and the like can be achieved.

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.

This research focuses on the preparation and application of guanidine-based ionic porous organic polymers for gold extraction from water, belonging to the field of porous organic polymer materials. Four guanidine-based ionic covalent organic framework materials (Ionic-COF-X, X:Cl) with different counterions were synthesized by reacting ionic guanidine hydrochloride monomers as organic linkers with aromatic ring-substituted triazine derivative ligands (TFBT), followed by anion exchange. ‑ ,Br ‑ AcO ‑ and SO4 2‑ A guanidine-based porous ionic polymer material (PiP-1) was obtained by reacting an ionic guanidine hydrochloride monomer as an organic linker with an aromatic ring-substituted benzimidazole derivative ligand (BDBI). PiP-1 was then applied to the adsorption and removal of gold ions in solution. It exhibited extremely high saturation adsorption capacity, rapid adsorption kinetics, high selectivity, and recyclability, showing potential for gold adsorption in practical applications.

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 application discloses a device and method for extracting gold from gold concentrate by non-cyanide leaching, and the device comprises a tank body, a detachable end cover is arranged on the upper end of the tank body, a driving motor is fixedly arranged on the upper end of the end cover, a stirring shaft is fixedly connected to the output end of the driving motor and penetrates through the end cover, the stirring shaft is provided with a stirring paddle, a pressure adjusting plate which is threadedly connected with the stirring shaft is further sleeved on the stirring shaft, the adjusting plate is in interference fit with the inner wall of the tank body, the stirring shaft is provided with a reversing thread matched with the adjusting plate, and the adjusting plate is reciprocally displaced along the stirring shaft to adjust the pressure in the tank body by rotating the stirring shaft. The application not only reduces the harm of leaching reagents to human bodies, but also improves the gold extraction rate.

The application discloses a modified activated carbon for gold extraction, and relates to the technical field of gold extraction, which comprises the following raw material components and weight parts: acid-washed wood charcoal powder 55-65 parts; waste plastic particles 15-25 parts; sulfonated asphalt 10-18 parts; sodium mercapto-modified humic acid 5-10 parts; sulfur-containing silane coupling agent 1-2 parts; nano alumina 1-3 parts; pore-forming agent 2-4 parts; and extrusion aid 0.5-1 part. Compared with traditional coconut shells, the modified activated carbon reduces the cost, realizes waste recycling, improves the gold adsorption capacity, greatly reduces the residual gold desorption, effectively improves the abrasion rate, and improves the copper interference resistance.

The utility model discloses a suction and spray type gold extraction device, and relates to the technical field of gold extraction devices. Comprising a six-layer crushing sand making machine, a leaching pool and an adsorption pool, the six-layer crushing sand making machine is connected with a pump body, the input end of the pump body is connected with the output end of the six-layer crushing sand making machine, the output end of the pump body is connected with a first connecting pipe, the first connecting pipe is connected with a first connecting opening, and the first connecting opening is connected with a second connecting opening. The first connecting port is positioned at the upper part in the side wall surface of the leaching pool, and three slurry pumps are arranged on the inner bottom surface of the leaching pool. According to the utility model, a structure for quickly separating out gold particles is designed, ore pulp is sprayed out or pushed out towards one direction or a back-and-forth direction by utilizing all thick pulp suction type pumps, gold elements in the mortar are quickly dissolved to form the gold particles under strong pushing, and the gold dissolving speed is two to three times higher than that of common stirring gold dissolving speed. The gold dissolving speed for treating the tailing slag is especially high, the recovery rate is very high and ranges from 60% to 90%, and the method is environmentally friendly, free of pollution and low in cost.

The invention discloses a method for extracting gold through leaching after preoxidation of sulfide gold ore, and aims to solve the problems of low recovery rate, serious environmental pollution and the like of a traditional gold extraction method. The method comprises the following steps: firstly, mixing and finely grinding the gold sulfide ore and caustic soda flakes to 325 meshes, and adjusting the concentration of ore pulp to 33%; then, oxygen-enriched air is introduced into the reaction kettle and heated to 90 DEG C, pre-oxidation treatment is carried out for 18 hours, sulfide minerals are oxidized and decomposed, and gold particles are exposed; then, adding a golden cicada environment-friendly gold extraction agent and activated carbon for leaching, continuously reacting for 18 hours to form a thiosulfate complex of gold, and adsorbing the thiosulfate complex by the activated carbon; and finally, recovering gold by filtering and analyzing electrolytic activated carbon, and performing dry discharge on tailings to prepare bricks. By implementing the method, the leaching recovery rate of gold can be remarkably increased to 97%, meanwhile, cyanide is prevented from being used, environmental pollution is reduced, comprehensive utilization of resources is achieved, and the method has the multiple advantages of being efficient, environmentally friendly, economical and the like.

This invention belongs to the field of wastewater treatment technology, and specifically relates to a device and method for treating wastewater from potassium gold cyanide production. The device includes a high-concentration wastewater treatment line, a low-concentration wastewater treatment line, and a PLC controller. The high-concentration wastewater treatment line includes a high-concentration wastewater pipeline, on which a high-concentration wastewater equalization tank and a filtration pretreatment component are sequentially installed. This invention provides dual-line separation treatment for high-concentration and low-concentration potassium gold cyanide production wastewater. The high-concentration wastewater undergoes electrolytic gold extraction to achieve efficient recovery of elemental gold and in-situ pre-cyanide removal. The low-concentration wastewater and the high-concentration wastewater after gold extraction undergo resin adsorption for specific recovery of trace amounts of gold and breaking down the gold-cyanide complexation barrier. Subsequent unified oxidation removes cyanide, thus accurately recovering gold resources, preventing precious metal loss, significantly reducing reagent energy consumption and treatment costs, and ensuring more thorough staged cyanide removal and detoxification. This also strictly controls the risk of highly toxic HCN leakage, ensures safe disposal, achieves stable effluent compliance, and reduces hazardous waste production.

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 application provides a kind of cyanide leaching of immersion aid and leaching method, belongs to cyanide leaching gold field, wherein, the immersion aid is composed of the following mass percentage components: ammonium persulfate 50~80%, potassium citrate 10~30%, calcium peroxide 5~10%, ergothioneine 5~10%. The immersion aid provided by the application is added to the cyanide leaching process, which can improve the leaching efficiency, shorten the leaching time and reduce the amount of sodium cyanide. Compared with traditional immersion aid, the formula does not contain heavy metals, reduces the risk of environmental pollution, and the combination of ammonium persulfate and calcium peroxide is more stable than single oxidizing agent and is not easy to decompose and fail. The immersion aid has the advantages of oxidation strengthening, impurity inhibition and environmental friendliness, and can be widely used in cyanide gold extraction process, and has significant industrial application value.

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 application provides a sulfide ore alkaline desulfurization cyanide leaching gold reagent system and a gold extraction method thereof, and belongs to the technical field of hydrometallurgy. The method constructs a ternary reagent system composed of potassium ferricyanide, low-concentration sodium cyanide and thioguanosine. An efficient "oxidation-inhibition" synergistic system is formed between the auxiliary desulfurization reagent potassium ferricyanide and thioguanosine. The rapid and selective oxidation of potassium ferricyanide is smoothly carried out under the synergistic action of thioguanosine, the mineral is completely decomposed, and the surface remains high activity; at the same time, the presence of thioguanosine can more directly eliminate the risk of local micro-area passivation and catalyze electron transfer. The two complement each other, and together guarantee that the subsequent low-concentration sodium cyanide can smoothly and unobstructedly leach the exposed gold with high efficiency, finally realizing the high recovery rate extraction of gold in the refractory sulfide ore while reducing the total consumption of reagents and environmental pollution.

This invention belongs to the field of hydrometallurgical technology, specifically relating to a method for enhanced gold extraction from cyanide tailings based on magnetically controlled hydrothermal magnetization activation and manganese doping treatment. The method includes: providing cyanide tailings particles; adding the cyanide tailings particles and a biomass reducing donor to an aqueous medium to form a slurry; adjusting the pH of the slurry to obtain an alkaline reaction system; adding a magnetothermal medium of ferric oxide or ferric chloride to the slurry and stirring with MnSO4 to obtain a reaction slurry; placing the reaction slurry in a closed magnetically controlled hydrothermal reactor and conducting a hydrothermal reaction under an external magnetic field; after cooling the reaction product, performing solid-liquid separation; performing graded magnetic separation on the solid phase; leaching the non-magnetic product using a thiosulfate-ammonia system to allow gold to enter the leaching solution; adding a recyclable magnetic gold-capturing carrier to the leaching solution for adsorption and enrichment; recovering the carrier through magnetic separation and regenerating it through analysis to obtain a gold-rich solution; and recovering gold from the gold-rich solution. The above method can stably achieve a synergistic gain in gold extraction and harm reduction under low-temperature hydrometallurgical conditions.

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 application provides a kind of microbial air synergic oxidation method green gold extraction system, and relates to the technical field of microbial gold extraction.The system is mainly composed of photovoltaic power generation and energy storage power station, oxidation air compressor, air conditioner, stirring air compressor, multistage gas oxidizer, tail gas absorption mechanism and the like.Under the guarantee of the effect of microbial oxidation pretreatment gold extraction, the whole system discards the complex mechanical structure of the built-in heat exchanger and turbulence plate in the traditional mechanical stirring tank, adopts air oxidation, air heat exchange and multistage air replacement stirring, solves the problems of dissolved oxygen content, temperature and homogeneity required to control microbial oxidation.In addition, the large height-diameter design of the closed normal pressure oxidation tower body makes the oxygen utilization rate high and the tower body heat dissipation good;there is no complex heat exchanger system and mechanical transmission inside, so that the mechanical failure and maintenance difficulty are reduced, the energy consumption is reduced, and the structure is simple and the investment is reduced.

This invention relates to the field of valuable metal recovery technology, and particularly to a method for recovering valuable metals from cyanide-extracted gold-bearing carbon sludge. The steps are as follows: S1, mix carbon sludge, lime, quartz, and borax evenly, and put them into a smelting device. Place an extractant on top of the mixture and perform high-temperature smelting. After cooling, separate the slag and copper-iron alloy; S2, add the copper-iron alloy obtained in S1 to the extractant and put it into the smelting device for high-temperature melting and extraction. After extraction, cool until the iron phase precipitates. Before the extractant solidifies, remove the iron-rich phase and allow the remaining molten metal to continue cooling; S3, perform vacuum distillation on the valuable metal alloy obtained in S2. After cooling, remove the volatile extractant and the gold-silver-copper alloy. The method for recovering valuable metals from cyanide-extracted gold-bearing carbon sludge provided by this invention can simply and efficiently recover valuable metals from carbon sludge and has good application value.

The invention provides a method and system for removing high-concentration complex cyanogen in gold extraction wastewater, and relates to the technical field of sewage treatment.The method comprises the steps that the pH of the gold extraction wastewater is adjusted to 8-10, and pretreated wastewater is obtained; adding a cobalt ferrite particle catalyst into the pretreated wastewater, and introducing ozone to obtain oxidized effluent; dividing the oxidized effluent into a solution A and a solution B according to a volume ratio, oxidizing the solution A by using anaerobic ammonium oxidation bacteria under the condition of low dissolved oxygen, and mixing the oxidized solution A with the untreated solution B to obtain a mixed solution; enabling the mixed solution to react with anaerobic ammonium oxidation bacteria through a porous adsorption material, and recovering the cobalt ferrite particle catalyst for recycling. According to the method, the removal rate of the high-concentration complex cyanogen can be effectively increased, thorough mineralization of the complex cyanogen is achieved, and the core problem that the complex cyanogen is difficult to degrade is solved; and the method and the system have relatively high load resistance, are simple and convenient to operate and have good adaptability.

The utility model discloses a tail gas purification treatment device of biological oxidation gold extraction relates to tail gas purification treatment device technical field, the utility model discloses a main frame mechanism, the main frame mechanism includes the purification tower, the left side fixedly connected with the air inlet pipeline of purification tower outer surface, the top fixedly connected with the exhaust pipe of purification tower, the bottom fixedly connected with the deflector of purification tower inside, the utility model discloses a purification subassembly is set up, specifically is through setting up multilayer carbon filling layer, and carbon filling layer adopts the mixture of active carbon and modified molecular sieve, can increase the contact area and contact time of tail gas and absorption liquid and adsorbent, improve the removal efficiency to harmful gas, simultaneously, sodium hydroxide and hydrogen peroxide in absorption liquid can carry out chemical reaction and oxidation decomposition to different properties harmful gas, thereby realize the efficient purification to multiple harmful gas, effectively reduced the emission concentration of harmful substance in tail gas, and the environmental protection emission standard has been greatly improved.