141 results about "Gold extraction" patented technology

The invention provides a treatment method for low-grade multi-metal gold concentrate, and relates to the technical field of comprehensive utilization of minerals. According to the treatment method of the low-grade multi-metal gold concentrate, most of iron and copper form iron-copper matte through pyrogenic smelting, meanwhile, gold is captured into the iron-copper matte, then iron-copper matte powder is obtained after water quenching and ball milling, the iron-copper matte powder is subjected to oxidation ammonia leaching, copper in the iron-copper matte is extracted, and the iron-copper matte powder is subjected to oxidation ammonia leaching to obtain the low-grade multi-metal gold concentrate. The obtained copper-containing ammonia leaching liquid is subjected to a traditional extraction-reverse extraction-electrodeposition process to obtain an electrodeposited copper product, ammonia leaching residues obtained after copper extraction are subjected to cyanidation leaching, gold in the ammonia leaching residues is extracted, cyanidation liquid is subjected to a traditional gold extraction process to obtain a gold product, the cyanidation tailings mainly comprise iron sulfide, the content of iron and sulfur in the tailings is high, and the content of sulfur in the tailings is high. And the subsequent cinder can be directly sold as an iron-making raw material. The amount of iron-silicon slag generated by the method is extremely low, and compared with a traditional molten pool smelting method, the comprehensive utilization rate of iron in the multi-metal gold concentrate is greatly increased.

The invention discloses a carlin type gold concentrate in-situ self-excitation and enhanced gold leaching method which comprises the following steps: adding an oxidizing agent and an alkaline reagent into a carlin type gold concentrate ore pulp system in a continuous, slow and proper adding manner at normal temperature and normal pressure, maintaining the oxidation potential of the ore pulp system to be-600 to-15.3 mV and the pH value to be 7 to 11, and carrying out in-situ self-excitation and enhanced gold leaching on the carlin type gold concentrate; and gold-loaded sulfide minerals in the gold concentrate are subjected to in-situ oxidation in a leaching system to generate stable thiosulfate as a gold leaching agent, so that in-situ self-excitation and enhanced gold leaching of the Carlin type gold concentrate are realized. According to the method, thiosulfate is formed through in-situ self-excitation, meanwhile, gold is extracted through in-situ complexing, consumption of external thiosulfate is reduced, pretreatment is not needed in the gold leaching process, the technology is simpler, the production cost is lower, the good gold extraction rate is guaranteed, meanwhile, no special requirement for equipment is needed, and the system is more controllable.

The invention discloses a method for removing thiocyanate radicals in cyanide-containing wastewater, and belongs to the technical field of metal refining. The method comprises the following steps: adding concentrated sulfuric acid to adjust the pH value of cyanogen-containing wastewater to 2-3, carrying out a stirring reaction, filtering, adding sodium hydrosulfite into a filtrate, simultaneously adding concentrated sulfuric acid to maintain the pH value to 3-5, carrying out a stirring reaction, firstly introducing a sodium sulfite acidic solution into overflowed H2S and HCN gas to absorb H2S gas, and then introducing a sodium hydroxide strong alkaline solution to absorb HCN gas. Aiming at cyanide-containing wastewater subjected to acidification treatment, firstly, a strong reducing agent sodium hydrosulfite is added to reduce SCN <-> into H2S and HCN with recycling value, then H2S is absorbed, elemental sulfur is recovered, finally HCN is absorbed, CN <-> is recovered, and the method is used for cyaniding gold extraction of a gold leaching system. The absorption and separation of H2S and HCN gas are realized, the recovery of elemental sulfur and CN <-> is further realized, and other ions are not introduced into a water supply system.

The invention discloses a device and a method for controlling activated carbon in an all-mud cyanided carbon slurry gold extraction process, and relates to the technical field of all-mud cyanided carbon slurry gold extraction processes. The device comprises a plurality of groups of dipping and absorbing tanks, a water pipe and a carbon powder pipe, the water pipe is communicated with the dipping and absorbing tanks through a water supplementing pipe, a second flow control valve is fixedly mounted in the water supplementing pipe, the carbon powder pipe is communicated with the dipping and absorbing tanks through a carbon supplementing pipe, a third flow control valve is fixedly mounted in the carbon supplementing pipe, and a carbon lifting device is fixedly mounted in each dipping and absorbing tank. And a discharge hole of the charcoal lifting device is communicated with the next group of immersion and suction tanks through a connecting pipe. Through the arrangement of the carbon supplementing pipe and the third flow control valve, the multiple sets of leaching and absorbing tanks can be controlled to add different kinds of carbon powder at the same time, and therefore under the condition that flowing of ore pulp is not stopped, the carbon density of the next set of leaching and absorbing tanks cannot be affected while the carbon density of the corresponding leaching and absorbing tanks can be adjusted, the carbon sealing control precision is high, flowing of the ore pulp does not need to be stopped, and the service life is long. And the gold extraction efficiency is greatly improved.

The invention belongs to the technical field of gold smelting wastewater treatment and resource utilization, and relates to a method for recycling gold by cooperatively treating tailings with acid wastewater, which comprises the following steps of: (1) concentrating the acid wastewater; (2) controlling the fineness of the roasting cyanidation gold extraction tailings; (3) removing impurities by acid; (4) adsorbing and recovering gold and silver by using thiourea leaching carbon; and (5) vulcanizing the acidolysis solution to recover copper and arsenic in a targeted manner. According to the method, efficient treatment is carried out through a five-stage treatment process, so that sulfuric acid in the acid wastewater is efficiently recycled, the roasting and cyaniding gold extraction tailings are comprehensively and efficiently utilized, resource high-value utilization and clean production of the acid wastewater and the roasting and cyaniding gold extraction tailings are achieved, and harm of the acid wastewater and the roasting and cyaniding gold extraction tailings to the environment is eliminated; the technological process is smooth, operability is high, the environment is excellent, and remarkable economic benefits, social benefits and environmental benefits are achieved.

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 provides a gold leaching agent of a compound leaching aid system and a dump leaching process, and belongs to the field of hydrometallurgy, the gold leaching agent comprises an agent main body and the leaching aid system, the agent main body is sodium cyanide, the leaching aid system comprises an oxidizing agent, an oxidation synergist and a chelating gain agent, the chelating gain agent is a furan ring-shaped hydroxamic acid compound. According to the method, the high-selectivity leaching auxiliary is designed, the components of the dump leaching agent system are regulated and controlled, and efficient gold extraction of the dump leaching process is achieved through the synergistic effect of all the components in the system. Wherein the chelating gaining agent can form a stable chelate with metal ions in a solution through a special annular structure and chelating capacity, so that the metal ions are prevented from precipitating again, gold ions in the solution are kept in a free state, further reaction of sodium cyanide is facilitated, and the leaching rate of gold is increased. Meanwhile, the aromaticity of furan rings and oxygen heteroatoms enhance the solubility and stability of the furan rings in water, and the effect of the whole leaching process is improved.

The invention discloses a selective gold extraction process by a thiosulfate method, which comprises the following steps of: adding gold ore and anion exchange resin into an aqueous solution of a leaching agent, and stirring and leaching to obtain ore pulp containing gold-loaded resin; the leaching agent comprises thiosulfate, copper salt and ammonia water; separating the gold-loaded resin from the ore pulp, and desorbing the gold-loaded resin by adopting a desorption agent to obtain a gold-rich desorption solution; and adding dithionite into the gold-rich desorption solution for reduction to obtain an elemental gold product. According to the process disclosed by the invention, resin adsorption and recovery are synchronously realized during gold leaching, and coadsorption of copper is avoided, so that gold can be enriched by adopting the gold-loaded resin through one-section desorption, and the gold extraction process flow is greatly simplified. In addition, the process is high in gold leaching rate, short in leaching time, low in agent consumption and low in leaching cost. In addition, the resin can be directly and circularly used for gold leaching without regeneration, the reduction barren solution can be circularly used for desorption of the gold-loaded resin by supplementing a small amount of desorption agent, and the recovery cost is low.

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 gold extraction method for carbon-containing refractory gold ore, and belongs to the technical field of hydrometallurgy. The carbon-containing refractory gold ore is placed in an electrolytic bath containing electrolyte, the pH of ore pulp is adjusted to be larger than 2 and smaller than or equal to 7, voltage is applied to an electrode, and electrochemical oxidation pretreatment is carried out. And then, the pH value of the ore pulp is adjusted to be larger than or equal to 1 and smaller than or equal to 2, anion resin is added, stirring and gold leaching are conducted, and efficient recovery of gold is achieved. According to the method, through electrochemical oxidation pretreatment, oxidation removal of carbon can be effectively achieved, and the gold robbing performance of carbon on gold is eliminated. And meanwhile, acid leaching and recycling of gold in the pretreated gold ore are successfully achieved, the acid-base transformation step of oxidizing slag is reduced, and non-cyanide leaching of gold is achieved. According to the method, gold in the carbon-containing refractory gold ore can be efficiently recycled, the technological process is short, operation is easy and convenient, environment friendliness is achieved, and a valuable technical scheme is provided for the field of precious metal hydrometallurgy.

The invention discloses a short-process low-cost continuous and stable gold extraction process adopting a thiosulfate method, and belongs to the field of hydrometallurgy. In a closed reactor, by adjusting the concentration of dissolved O2, thiosulfate and a catalyst to be at a low level, the potential of ore pulp is reduced to a suitable range to leach gold ore, and leaching residues and a leaching pregnant solution are obtained through filtering. And pure nitrogen is introduced into the leaching pregnant solution to completely discharge oxygen in the solution, copper powder is added for replacement, and gold-rich crude copper and a replacement barren solution are obtained through filtering. Crude copper rich in gold is treated through electrolytic refining, pure copper is obtained from a cathode, and gold mud is obtained from an anode. And washing the gold mud with dilute acid to obtain a copper-containing pickling solution and pure gold. After the pH of the copper-containing pickling solution is adjusted, the copper-containing pickling solution and the replacement barren solution supplemented with the leaching agent are combined and used for leaching of fresh ore in the next circulation. The method provided by the invention solves the problems of long technological process, high circulation cost and high environmental protection pressure of a copper ammonia catalysis thiosulfate method, and is suitable for being used in a natural environment.

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 invention provides a biological extraction agent and a method for extracting gold in cyaniding waste water, and belongs to the field of waste water purification. Histidine is used as a raw material, a total sulfur ester group is introduced into a histidine molecule main chain through a chemical reaction, the total sulfur ester group is combined with gold ions through the dissociation characteristic of sulfydryl under the alkaline condition, and the total sulfur ester group is separated from the total sulfur ester group. The stable multi-element annular gold chelate is formed. The special structure of the imidazole ring side chain is beneficial to the reaction, other metal ions are masked, and selective chelation of gold ions is ensured. The biomass extraction agent provided by the invention can effectively extract gold in cyaniding wastewater, gradient recovery of gold and other metal ions is realized through a reverse extraction process, and the influence of impurity ions on the gold extraction effect is avoided. By regulating and controlling the types, the number and the molecular structures of the functional groups, efficient chelation of activation sites of molecules of the extraction agent and gold ions is guaranteed, and efficient selective extraction of low-concentration gold in the cyanide-containing wastewater is achieved.

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.

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 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.

The invention provides a method for extracting gold resources in urban mineral products based on a TEMPO electro-catalysis-histidine gold leaching agent system, and belongs to the technical field of precious metal recycling. According to the method, original copper / iron impurities in the waste printed circuit board are utilized, and a Cu < 2 + > / Fe < 3 + >-TEMPO redox coupling concerted catalysis system is constructed. A stepped electron transport chain is formed by Cu < 2 + > (E < degree > = 0.34 V vs SHE) and Fe < 3 + > (E < degree > = 0.77 V) which are generated in situ and TEMPO < + > (E < degree > = 0.75 V). The electron transfer efficiency of TEMPO < + > / TEMPO redox on SHE (E degree is equal to 0.75 V vs. SHE) is precisely regulated and controlled through an electric field, the dissolution rate of gold is remarkably increased, meanwhile, energy consumption is reduced, the impurity co-dissolution rate is low, and efficient selective recovery of gold resources in electronic waste is achieved. By means of the TEMPO electro-catalysis-histidine chelation synergistic system, efficient selective extraction of gold in urban mineral products is achieved, and the key problems that in a traditional cyanide-free gold extraction process, the consumption of an oxidizing agent is large, selectivity is poor, and efficiency is low are fundamentally solved.

The invention discloses a step-by-step impurity removal method for impurity-containing gold-loaded resin, and belongs to the technical field of mineral processing. The method specifically comprises the following steps: mixing the impurity-containing gold-loaded resin into slurry, putting the slurry into a small-sized thickener, stirring, standing, and removing fine light flocculent impurities on the upper layer; the impurity-removed gold-loaded resin is subjected to size mixing and placed in a vibrating spiral chute, large-specific-gravity coarse-particle colloidal impurities are removed, then the impurity-removed gold-loaded resin is placed in a multi-layer wet-type vibrating screening machine, pine needles, wood chips and other impurities with large particle sizes are removed through an upper-layer large-aperture vibrating screen, fine-crushed humus impurities are removed from an upper-layer undersize material through a lower-layer small-aperture vibrating screen, and the gold-loaded resin is subjected to impurity removal; the undersize is impurity-removed gold-loaded resin; all the obtained impurities are combined and checked and screened through a suspended vibration conical surface sorting machine, coarse particle products are impurities, and a small amount of fine particle products are resin. Aiming at the characteristics of different impurities in the gold-carrying resin, the invention develops a unique step-by-step impurity removal process, and high-quality gold extraction raw materials can be provided for resin ore pulp process enterprises.

The invention belongs to the technical field of metallurgy, and relates to a multi-stage circulation gold extraction method for high-carbon-arsenic-sulfur gold and silver concentrate, which comprises the following steps: (1) grinding and oxidizing; (2) direct cyanidation; (3) roasting and oxidizing; (4) leaching gold with acid; and (5) cyaniding and gold leaching. The direct cyanidation-roasting oxidation-cyanidation gold extraction process is provided for the micro-dip dyeing type carbon-containing, high-arsenic and high-sulfur difficult-to-treat gold and silver concentrate, gold and silver dissociated from monomers are recycled through the first-stage direct cyanidation process, sulfide wrapping gold and carbonaceous matter wrapping gold are thoroughly oxidized through the second-stage roasting oxidation process, and gold and silver are separated from the gold and silver through the first-stage direct cyanidation process. And in the third stage, high-acid acid leaching-cyaniding is adopted to extract gold and silver, the problem of gold extraction of carbon-containing, high-arsenic and high-sulfur triple difficult-to-treat gold and silver concentrate is solved, and the method has the advantages of being high in gold and silver recovery rate, high in production efficiency, low in comprehensive cost, easy to industrialize, short in production period, environmentally friendly and the like.

The invention belongs to the technical field of gold smelting comprehensive treatment and resource utilization, and relates to a method for comprehensively recovering sulfur and iron by treating acidic wastewater with alkaline waste residues, which comprises the following steps: (1) neutralizing primary acidic wastewater; (2) preparing pellets from the secondary neutralization slag filter cake and cyanidation tailings; (3) roasting the third-stage pellets at high temperature to collect sulfur; and (4) iron ore concentrate is recycled through four-stage magnetic separation. The technological method is simple and easy to implement, sulfur elements and iron elements in the acid wastewater and the cyaniding gold extraction tailings are efficiently recycled, the alkaline waste residues are comprehensively and efficiently utilized, resource high-value utilization and clean production of the acid wastewater and the alkaline waste residues are achieved, meanwhile, the cyaniding gold extraction tailings are cooperatively treated, and the environmental pollution is reduced. The harm of acid wastewater, alkaline waste residues and cyaniding gold extraction tailings to the environment is eliminated, the technological process is smooth, operability is high, the environment is excellent, and remarkable economic benefits, social benefits and environmental benefits are achieved.

The invention relates to a method for regenerating an invalid gold extraction agent. The method comprises the following steps: (1) sodium sulfite pretreatment; (2) reducing the extracting agent: firstly adding sodium hydroxide into the gold extracting agent pretreated in the step (1) to adjust the pH value, then adding a hydrazine hydrate reducing agent, reacting for 1-1.5 hours, and filtering to obtain the reduced gold extracting agent; and (3) hydrogen is supplemented through hydrochloric acid, and finally the regenerated gold extraction agent is obtained. Through the process route of sodium sulfite pretreatment, extraction agent reduction and hydrochloric acid hydrogen supplementation, impurities in the invalid gold extraction agent can be effectively removed, and the extraction capacity of the invalid gold extraction agent is recovered. After the regenerated gold extraction agent and the new gold extraction agent are mixed according to the ratio of 1: 1, the extraction rate of gold in the gold-containing solution reaches 99% or above, the service life of the extraction agent is remarkably prolonged, the production cost is reduced, the use amount of the new extraction agent and the output of the waste extraction agent are reduced, and the environmental risk caused by treatment of the waste extraction agent is avoided.

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.