38 results about "Cyanide leaching" 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 method for quantitatively testing the content of organic carbon and disseminated particle size in gold ore, and belongs to the technical field of gold ore detection. The method comprises the steps of sample preparation and quantitative testing, wherein palm wax serves as a cementing agent, barite serves as a standard sample, and a to-be-tested sample is prepared through melting, mixing, consolidation, polishing and carbon spraying; the quantitative test is based on an automatic process mineralogy test system, palm wax backgrounds are removed through backgrounds deduction, an energy spectrum library is established to recognize organic carbon and barite particles, the area ratio of the organic carbon and the barite particles is measured, the mass ratio is converted by combining the density ratio, the organic carbon content of raw ore is inversely calculated, and meanwhile, the particle size distribution of the organic carbon is counted. The method solves the problem that the content and granularity of organic carbon cannot be accurately quantified at the same time in the prior art, has the advantages of high test precision, high efficiency, comprehensive parameters and simplicity and convenience in operation, and can provide key data for optimization of a gold ore cyanidation leaching process.

The invention relates to a gold oxide ore carbon slurry cyaniding smelting extraction method which comprises the following steps: 1) pretreating ore pulp: adding lime milk into gold oxide ore powder, adjusting the pH value to be greater than 10.5 to obtain ore pulp, then adding a pretreating agent, and fully and uniformly mixing to obtain pretreated ore pulp; (2) synchronous cyaniding leaching and adsorption are conducted, specifically, the pretreated ore pulp is subjected to synchronous leaching and adsorption, in the process, the concentration of free cyanogen is controlled to be 0.04%-0.06%, the PH value is controlled to be larger than 10.5, the concentration of a carbon adsorbent is controlled to be 18-22 g / L, and a gold loading material is obtained; the gold loading material is desorbed till the gold concentration in a desorption solution is smaller than or equal to 0.2 mg / L, desorption is stopped, a pregnant solution is obtained and then electrolyzed, when the gold concentration is smaller than or equal to 0.2 mg / L, electrolysis is stopped, scraping is conducted, and gold mud is obtained, and (4) smelting and aftertreatment are conducted, the gold mud is smelted and subjected to aftertreatment, and gold is obtained.The process has the advantages of being small in cyanide consumption and the like.

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 provides a chemical oxidation pretreatment agent system and a method for treating low-grade high-sulfur gold ore through the chemical oxidation pretreatment agent system, and belongs to the technical field of metal hydrometallurgy. According to the method, a pretreatment agent system is designed, and low-grade resources are economically and efficiently recycled by optimizing the whole technological process of sulfur separation enrichment, targeted pretreatment and concentrated leaching and key operation parameters. According to the method, firstly, high-sulfur ore is artificially divided into high-sulfur first-section gold concentrate and low-sulfur second-section gold concentrate through ore grinding and flotation, and most sulfide wrapping gold is concentrated in the high-sulfur first-section gold concentrate; and then, the high-sulfur first-stage gold concentrate is subjected to a pretreatment process, and the wrapping structure of sulfide on gold is deeply destroyed selectively through superfine grinding and a pretreatment agent, so that the subsequent cyanidation leaching rate is effectively increased. Through fine grinding, flotation and step-by-step pretreatment, the pretreatment amount and the total treatment amount in follow-up cyanidation leaching are reduced, and the overall energy consumption and cost of cyanidation leaching of the low-grade high-sulfur-content gold ore are reduced from the source.

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 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 relates to a gradient treatment and multi-metal collaborative recovery process for micro-fine particle coated sulfur concentrate. The gradient treatment and multi-metal collaborative recovery process comprises the following steps: (1) carrying out acidic complexing reinforced desilicication pretreatment; (2) two-stage temperature-controlled and atmosphere-controlled roasting: vulcanizing and volatilizing in a first-stage low-temperature reducing atmosphere to remove arsenic, and pore-forming and desulfurizing in a second-stage medium-temperature oxidizing atmosphere; (3) selectively extracting copper by reducing ammonia leaching; and (4) gold and silver are leached in a non-cyanide mode. According to the cascade treatment and multi-metal collaborative recovery process, a complete technical chain from'blocking secondary wrapping from the source 'to'recycling arsenic and sulfur in the process' to'multi-metal cascade recovery 'is constructed, the gold recovery rate and the silver recovery rate are stabilized to be 90% or above and 80% or above respectively, the copper recovery rate reaches 88% or above, and the iron ore concentrate grade is gt; arsenic is smaller than or equal to 0.10%, sulfur is smaller than or equal to 1.0%, and the resource recovery rate gt of arsenic and sulfur is achieved; the comprehensive utilization rate of resources is increased by more than 35%, and comprehensive breakthrough in four dimensions of recovery rate of valuable elements in the sulfur concentrate difficult to treat, product quality, environmental protection benefit and economical efficiency is realized.

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.

The utility model provides an activated carbon adding device and cyanidation leaching equipment. The activated carbon adding device comprises a container and a first filter screen, the container is provided with an inlet, a water outlet and a carbon outlet, the inlet is higher than the water outlet and the carbon outlet and used for receiving a mixture of water and activated carbon, the water outlet and the carbon outlet are located at the bottom of the container, the water outlet is provided with the first filter screen, and the first filter screen is used for intercepting activated carbon in the container. The water outlet is used for discharging water in the container, and the carbon outlet is used for discharging activated carbon or a mixture of the activated carbon and the water in the container. The activated carbon adding device disclosed by the embodiment of the utility model can be used for realizing dehydration separation and storing activated carbon so as to add the activated carbon, and is small in occupied space and cost and convenient to manufacture and install.

The invention relates to a treatment method for high-mud-content secondary oxidation gold-containing iron ore. The treatment method comprises the steps of abrasive washing-gravity separation and tailing pre-discarding; performing two-stage magnetic separation and secondary enrichment; finely grinding and grading the pre-enriched high-grade minerals; cyanidation leaching; and recovering iron through two-stage magnetic separation. According to the method, two times of pre-enrichment and one time of cyanide-free tailing pre-discarding are achieved through the synergistic effect of abrasive washing-reselection tailing pre-discarding and weak magnetic-strong magnetic secondary enrichment, a large amount of soil, decomposed rocks and gangue are removed in advance at the front end of the grading process to serve as cyanide-free tailings, fine-grained and micro-fine-grained iron minerals in the pre-discarded tailings are fully recycled, and the purpose of recycling the iron minerals in the pre-discarded tailings is achieved. And loss of gold, silver and iron is reduced to the greatest extent. And then, the pre-enriched high-grade minerals are finely ground and graded, so that gold, silver and iron mineral monomers are fully dissociated, and a foundation is laid for subsequent cyanidation leaching and efficient separation of magnets and limonite. And finally, efficient gradient recovery of gold, silver and iron is achieved through the cyanidation leaching-two-stage magnetic separation technology, and the cyanide-containing tailings are lightened while the resource utilization rate is maximized.

The invention relates to a device and method for continuously measuring the concentration of carbon particles in ore pulp in the gold cyanidation leaching process, the device comprises an ore pulp barrel, a flushing system, a carbon measuring pipe, a screen and a control system, one end of the ore pulp barrel is provided with an ore pulp inlet, the other end of the ore pulp barrel is connected with a first branch of the flushing system, and the outlet end of the ore pulp barrel is connected with the carbon measuring pipe; the carbon measuring pipe is provided with a screen, one side of the screen is connected with a visual sensor installation branch used for installing a visual sensor, the other side of the screen is provided with an ore pulp discharging branch, the visual sensor is used for detecting the stacking height of carbon particles in the carbon measuring pipe, and a liquid level sensor is arranged in the ore pulp barrel. The liquid level sensor is used for detecting the total liquid level height of ore pulp, and the control system is used for controlling the action condition of the flushing system and calculating the volume of carbon particles according to liquid level height data obtained by the liquid level sensor and carbon particle height data obtained by the visual sensor.

The invention relates to the technical field of tailing slag treatment, and discloses a resourceful treatment device and method.The resourceful treatment device for precious metal extraction tailing slag comprises a treatment tank, a filter cartridge is rotationally connected into the treatment tank, a feeding hopper is fixedly connected to the top of the treatment tank, and the feeding hopper communicates with the filter cartridge; two groups of stirring rods are arranged and are symmetrically fixed on the two sides of the filter cartridge, and a driving part for driving the filter cartridge to rotate is arranged on the treatment tank; through synchronous rotation of the filter cartridge and the stirring rod, tailing slag and water are mixed to form ore pulp, and a leaching solution and the ore pulp can be uniformly mixed, so that the leaching efficiency is improved, meanwhile, the acid-base property of the ore pulp solution is regulated and controlled in real time, the ore pulp is always kept in an alkaline state, and the safety of cyanidation leaching treatment is ensured.

The present application relates to a kind of copper cyanide complex wastewater high-efficiency copper removal and recycling process, comprising the following steps: (1) copper cyanide complex wastewater critical acidification-selective crystallization: by accurately controlling wastewater pH value, make copper cyanide complex directional recombination generate insoluble CuCN crystal;(2) cyclone enhanced crystallization: by water cyclone, CuCN crystal and overflow liquid are separated;(3) composite sulphidizing agent gradient activation deep copper removal: by adjusting pH value and adding composite sulphidizing agent, make micro CuCN particle and dissolved low coordination copper cyanide complex reaction generate insoluble CuS crystal;(4) magnetic seed enhanced separation: using modified magnetic seed and weak magnetic separator magnetic separation, CuS magnetic flocculation is separated from wastewater, and finally purified tail liquid is obtained.The closed-loop process of the present application can efficiently remove and recover copper in copper cyanide complex wastewater, and the purified tail liquid can be used for cyanide leaching operation, significantly reduce the consumption of sodium cyanide and improve gold and silver leaching rate, truly realize wastewater zero discharge and copper resource full recovery.

The present application provides an environmentally friendly cyanide-free gold leaching agent and a process for extracting gold from electronic waste, which belongs to the field of hydrometallurgy technology. The present invention designs an environmentally friendly cyanide-free gold leaching agent, uses non-toxic and renewable biomass resources as raw materials, optimizes its molecular structure through a series of derivatization methods, introduces specific functionalized molecular groups, and prepares a series of environmentally friendly cyanide-free gold leaching agents to solve the problem that existing cyanide-free leaching agents are difficult to process electronic waste. Under the premise of meeting technical feasibility, the balance between economy and environment is achieved to the greatest extent, and the gold leaching process is simple, easy to operate, and conforms to the original facilities of existing enterprises, without the need for additional investment in equipment upgrade costs.

The application discloses a kind of refractory gold concentrate biological oxidation carbon-in-pulp gold extraction process pollutant processing method, by biological oxidation residue filter pressing washing, reduce the impurity ions such as iron, arsenic, polysulfide into carbon-in-pulp cyanidation process from source, source reduces the generation amount of pollutants such as ferricyanide, arsenic, thiocyanate;Biological oxidation residue is treated with hydrogen peroxide before carbon-in-pulp cyanidation, oxidize low-valence sulfur to sulfate ion, can reduce the generation amount of thiocyanate from source, reduce the amount of gold leaching agent.Carbon-in-pulp cyanidation is carried out with low-cyanide reagent, reduce the cyanide content in carbon-in-pulp tailings;Carbon-in-pulp tailings are filter pressed and washed, filter pressing liquid is returned to be used for oxidation residue slurry, re-enter cyanide leaching, make full use of the residual gold leaching agent in filter pressing liquid, and valuable elements such as gold and silver in filter liquid are recycled.The application uses biological oxidation liquid to treat carbon-in-pulp tailings washing liquid, reduces the cost of cyanide breaking treatment of carbon-in-pulp tailings washing liquid.

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 invention discloses a smelting process for roasting gold concentrate in a two-stage fluidized bed furnace, which comprises the following steps: sequentially carrying out first-stage arsenic removal roasting and second-stage desulfurization roasting on the gold concentrate to obtain roasted sand, then carrying out cyanidation leaching on the roasted sand to obtain gold-containing leachate, adsorbing the gold-containing leachate by adopting activated carbon to obtain gold-loaded carbon, and desorbing the gold-loaded carbon to obtain gold-containing pregnant solution. Electrolyzing the pregnant solution to obtain gold mud, and casting the gold mud to obtain a gold ingot; according to the method, efficient utilization of the low-grade arsenic-containing gold concentrate is achieved through segmented temperature control arsenic removal and desulfurization, sulfur acid making cooperation and whole-process recovery rate optimization, and the recovery rate of gold reaches up to 91.6%.

This invention discloses a room-temperature and atmospheric-pressure alkaline leaching pre-oxidation-calcium chloride synergistic arsenic removal system and process for high-arsenic-sulfur gold concentrate. The process includes: fine grinding, alkaline pre-oxidation, calcium chloride synergistic arsenic and sulfur removal, solid-liquid separation, and cyanide leaching. In the alkaline pre-oxidation stage, NaOH is added and oxygen is introduced to achieve efficient oxidation of arsenic-sulfur minerals under room-temperature and atmospheric-pressure conditions. Subsequently, calcium chloride is added to rapidly precipitate arsenate and sulfate ions, forming stable calcium salt precipitates. This process effectively solves the problems of low cyanide leaching rate in high-arsenic-sulfur gold concentrate, equipment blockage caused by arsenic and sulfur accumulation in closed-loop circulation, and decreased leaching rate. Experimental results show that this invention can significantly improve the gold leaching rate and reduce cyanide consumption, demonstrating good industrial application value and economic efficiency.

The present invention relates to the field of metallurgy technology and relates to a method for improving the recovery rate of silver and copper by utilizing high-salt wastewater from wet antimony leaching, comprising the following steps: (1) first-stage silver-copper-gold concentrate blending; (2) second-stage high-salt wastewater output; (3) third-stage wet slurry mixing; (4) fourth-stage sulfuric acid roasting; (5) fifth-stage acid leaching of copper; and (6) sixth-stage cyanide leaching of gold and silver. The present invention achieves comprehensive recovery of silver-copper-gold concentrate and high-value utilization of high-salt wastewater by mixing silver-copper-gold concentrate with high-salt wastewater from wet antimony leaching at high temperature and sulfuric acid roasting, without generating wastewater or hazardous solid waste, thus meeting environmental protection requirements. The equipment of the present invention has a simple structure, stable operation, and strong adaptability, effectively solving the impact of circulating high-salt wastewater on the system during wet antimony leaching, and providing convenience for subsequent production. The process has low production costs and requires fewer personnel, effectively reducing costs.

The invention provides a method and a device for reinforced separation of carbon-containing and arsenic-containing micro-fine particle gold ore with segmented precise regulation and control, and belongs to the technical field of mineral processing. The device comprises a feeding system, a heating system, a suspension roasting furnace, a gas supply system, a detection system and an ore grinding and leaching system. The method comprises the following steps: firstly, crushing and grinding the carbon-containing and arsenic-containing micro-fine particle gold ore, and then drying; conveying the mineral powder into a pre-oxidation chamber of a suspension oxidation roasting furnace, and carrying out pre-oxidation arsenic removal roasting in a suspension state; then feeding into a suspension roasting furnace oxidation chamber, and carrying out decarburization roasting in a suspension state; and after the arsenic-removed calcine is naturally cooled, water is added for ore grinding, ore pulp is subjected to cyanidation leaching, and a gold-containing pregnant solution is obtained. According to the method, the carbon-containing and arsenic-containing micro-fine particle gold ore can be accurately regulated and controlled to be desulfurized and decarbonized under the proper condition, the mass transfer and heat transfer efficiency is high, the arsenic-carbon impurity removal rate is high, the energy consumption and cost of unit treatment capacity are low, the product property is easy to control and stable, and large-scale equipment is easy to realize.

The application provides a flotation pretreatment reagent system and a method for recovering gold from gold-containing waste soot, and belongs to the technical field of hydrometallurgy. The application designs a reagent system with multiple reagents in cooperation, constructs a gold recovery system of "catalytic oxidation-bridging anchoring-hydrophobic flotation", and successfully realizes the strategy change from passive inhibition of carbon adsorption to active separation of carbon carrier. Unlike the traditional method which only tries to passivate the adsorption activity of carbon, the present scheme converts the "gold-robber carbon" which interferes with gold recovery into a flotation carrier which is easy to separate through precise reagent cooperation, and fundamentally solves the problem of interference of carbon with cyanide gold extraction. The modified carbon clusters are efficiently separated by flotation due to their excellent hydrophobic properties, and gold is enriched in the tailings because it is not hydrophobized. This not only significantly improves the gold recovery rate of subsequent cyanide leaching, greatly reduces the reagent consumption, but also shows the important technical value of realizing process innovation through molecular level cooperative design.

The cyanide tailings roasting and resource utilization process includes cyanide tailings pretreatment and roasting, flue gas cascade separation and utilization, sodium sulfite preparation, fine grinding of roasting slag and secondary cyanide leaching of gold, SO2 de-cyanation treatment of secondary cyanide tailings, preparation of de-cyanation tailings for non-burning bricks and full-process closed-loop control, specifically including six process steps and conditions, which can realize harmless disposal of cyanide tailings, cascade high-value utilization of flue gas SO2, secondary efficient recovery of gold resources and full resource utilization of solid waste, forming a closed loop of "roasting-gold extraction-de-cyanation-resource utilization", thereby reducing the processing cost, improving the environmental protection and economic benefits and the like.

The invention belongs to the technical field of cyanidation leaching tanks, and particularly discloses an environment-friendly cyanidation leaching tank with a circulating system, which comprises a base, and a leaching mechanism, a preprocessing mechanism and a circulating mechanism which are fixedly mounted on the outer wall of the top of the base through bolts, an interlayer plate and a heat conduction inner layer are integrally formed in the leaching tank, and a main shaft is rotationally connected to the inner wall of the top of the leaching tank through a bearing; the problems that after cyanide and ore are added into a cyanidation leaching tank at a time, air is inflated slowly, so that the reaction of the cyanide and base metal in the ore is accelerated, a large amount of cyanide is consumed, and a solution is polluted are solved; the circulating mechanism can pump out a solution in the leaching mechanism, the pH value of the solution is detected through the pH value sensor so as to judge the content of cyanide in the solution, and then cyanide in the circulating tank is added into the solution through the dosing pipe according to needs and sent back into the leaching mechanism.

The present application relates to a kind of valuable metals and cyanide in cyanide leaching gold lean solution are recovered in alkaline conditions step by step, by calcium precipitation, zinc precipitation, aluminum reduction, aluminum precipitation and iron precipitation etc. To cyanide leaching gold lean solution is handled, the removal and recovery of calcium, zinc, copper, aluminum and ferrocyanide in lean solution are realized step by step.This application realizes the removal of calcium, zinc, copper, aluminum and ferrocyanide in lean solution step by step by the coupling of ferrous precipitation and aluminum reduction in alkaline conditions, effectively recycles high-grade zinc mud, copper mud and iron mud.The method solves the problem of producing toxic hydrogen cyanide and copper needs to be refined in the treatment of cyanide leaching gold lean solution by acidification-volatilization-neutralization method and sulfidation-acidification-recycling-concentration method, and completes the resource utilization of lean solution.This method of recovering valuable metals and cyanide in cyanide leaching gold lean solution step by step in alkaline conditions has important significance and value for the resource utilization, green production and environmental protection of cyanide leaching gold lean solution.

The invention discloses an alkaline pre-oxidation treatment method for tellurium-containing gold ore, and belongs to the technical field of hydrometallurgy. The method comprises the following steps: firstly, crushing and grinding the tellurium-gold ore to fully dissociate the tellurium-gold ore; then water is added to adjust the concentration of the ore pulp, NaOH is adopted to adjust the pH value of the ore pulp, and dithiooxamide and an oxidizing agent are added to adjust the potential of the ore pulp for alkaline leaching pretreatment; and after pretreatment is finished, residual oxidizing agents are removed through reducing substances, and then sodium cyanide is added for a conventional cyanidation leaching gold extraction process. Compared with an existing common tellurium-gold ore pretreatment process, the method has the advantages that the leaching potential of tellurium-containing minerals is reduced by adding the dithio-oxamide, so that the consumption of NaOH and an oxidizing agent in the alkaline leaching process is greatly reduced, the tellurium-gold ore treatment cost is reduced, and the economic benefit is improved.

This invention discloses a simultaneous arsenic removal aid for gold stockpiles, comprising a core arsenic removal aid component and functional auxiliary components. The core arsenic removal aid component is sodium cyanate. The functional auxiliary components are selected from at least one of sodium cyanate, sodium hydroxide, sodium chloride, barium chloride, ferric chloride, sulfamic acid, disodium hydrogen phosphate, trisodium citrate, ferrous sulfate, and sulfuric acid. Sodium cyanate and the functional auxiliary components work synergistically to simultaneously remove arsenic and aid leaching of arsenic-containing materials in gold stockpiles during the cyanide leaching process. The advantages are high efficiency in arsenic removal, low toxicity and safety, compatibility with cyanide leaching processes, and controllable cost.

The present invention discloses a method for reducing the consumption of sodium cyanide in copper-containing gold ore, and belongs to the technical field of hydrometallurgy. The copper-containing gold ore and the gold concentrate cyanide slag are mixed in a certain proportion and then pretreated. The acid generated in the pretreatment process reacts with the carbonate in the copper mineral to expose the copper mineral. After the ammonium salt is added, the copper in the copper mineral is complexed with ammonia. By solid-liquid separation, copper no longer enters the cyanide leaching system, thereby achieving the purpose of reducing the consumption of sodium cyanide. The process flow of the present invention is simple, the production cost is low, and it can effectively solve the problem of high sodium cyanide consumption in the cyanide leaching process of copper-containing gold ore. After treatment with the method of the present invention, the sodium cyanide consumption is reduced by more than 75%.

The invention discloses a method for recycling sodium cyanide tail liquid, which comprises the following steps: feeding cyanide-containing tail liquid into a stock solution pool, adjusting the pH value, filtering through a multi-medium filter and a self-cleaning filter, and removing suspended matters; switching to a standby adsorption tower through the adsorption tower; introducing a NaOH solution into the saturated resin, and circularly desorbing to obtain a desorption solution; removing organic impurities and heavy metal complexes from the desorption liquid through an activated carbon adsorption tower; concentrating the purified solution through an MVR (mechanical vapor recompression) evaporator; and the concentrated solution is directly reused in an electroplating or metallurgy main production process. According to the method, the recovery rate of sodium cyanide in the tail liquid is increased to 95% or above, and particularly for the industrial tail liquid with the cyanide ion concentration being 0.5-5 g / L, secondary utilization of resources is achieved; through deep purification and concentration, the purity of the recovered sodium cyanide solution reaches 99.5% or above, the concentration is stabilized at 200-300 g / L, the requirements of main production processes such as gold cyanidation leaching and electroplating are met, and degradation use is not needed.