169 results about "Cyanide leaching" patented technology

A method for the recovery of metal values from a metal value-bearing material containing arsenic and/or antimony and a source of sulphate ions such as sulphide ore or concentrate is disclosed. In one form the method comprises the steps of: (a) providing a feed stream comprising a metal value-bearing material containing arsenic and/or antimony and a source of sulphate ions; (b) subjecting the feed stream to oxidative conditions under elevated temperature and pressure conditions in the presence of at least one component selected to decrease the effective concentration of free acid generated during the pressure oxidation step and promote the formation of pH-stable iron (III) sulphate products, thereby forming a slurry comprising a metal value-containing leach solution and a solid leach residue containing pH-stable iron (III) sulphate products and environmentally stable iron-arsenic and/or iron-antimony products; (c) separating the metal value-containing leach solution from the solid leach residue; (d) recovering the metal value (s) from the metal value-containing leach solution; and (e) recovering precious metal values, if present, in the solid leach residue by cyanide leaching.

The invention discloses a method for producing insulating bricks by utilizing aluminum-electrolyzed waste refractory materials, relating to a recovery technology of waste refractory materials during the aluminum electrolysis production, wherein the aluminum-electrolyzed waste refractory materials are mainly various refractory material mixture in which waste cathode carbon blocks and side silicon carbide are removed. The method adopts the following raw materials in percentage by weight: 5-30% of the aluminum-electrolyzed waste refractory materials, 10-50% of fly ash or fly ash drift beads, 15-30% of a cementing agent, 1-5% of additives, 3-8% of a pore-forming agent and 10-20% of water, and the method comprises the following steps of: preparing the raw materials, mixing the raw materials, extruding the mixture to mold, drying and sintering to produce the insulating bricks; and by utilizing innocuous treatment measures, the extraction contents of fluoride and cyanide of the produced insulating bricks are lower than 50mg/l and 1.0mg/l, the smoke gas is adsorbed by an aluminum oxide, and the solvable injurant and the smoke gas of the insulating bricks both meet the national environment protection emission standard; and the produced insulating bricks can be applied to the heat insulation of various pipelines and walls at a temperature lower than 1000 DEG C.

The invention discloses a method for recycling gold and micro-fine particle antimony minerals in antimony-containing gold ore flotation tailings. By the adoption of the method, the technical problem that if the antimony-containing gold ore flotation tailings are subjected to cyanide leaching directly, the cost is high, and the gold recovery rate is low is solved. Meanwhile, efficient recovery of associated antimony minerals can also be achieved. The method is characterized by comprising the steps that the tailings are rated, the tailings with the particle size being larger than 0.038 mm are subjected to regrinding and size mixing, copper sulfate, lead nitrate and ammonia carbonate are added sequentially as a mixed activating agent, sodium n-butylxanthate and ammonium butyl aerofloat serve as a collecting agent, No.2 oil serves as a foaming agent, and gold and the antimony minerals are recycled through flotation; and water is directly added into the tailings with the particle size being smaller than 0.038 mm for size mixing, grinding is not needed, sodium hexametaphosphate, copper sulfate, lead nitrate, ammonia carbonate, sodium n-butylxanthate, No.25 aerofloat, kerosene (or diesel oil) and No.2 oil are added in sequence, wherein the sodium hexametaphosphate serves a dispersing agent, the copper sulfate, lead nitrate and ammonia carbonate serve as an activating agent, the n-butylxanthate and No.25 aerofloat serve as a collecting agent, the kerosene (or diesel oil) serves an emulsifying agent, and the No.2 oil serves as a foaming agent, and gold and the micro-fine particle antimony minerals are recycled through flotation. The technique is reasonable, procedures are simple, the gold and antimony recovery rate is high, and industrialized implementation is easy.

The invention discloses a hydrometallurgical gold cyanide leaching optimization method. By using the traditional hydrometallurgical gold cyanide leaching process and based on stable production and production index, the production cost is minimized. The method comprises the following process steps of: (1), data collection; (2), selection and data processing of auxiliary variables; (3), establishment of an optimization model; (4), solution of the optimization model; and (5), determining of operation guidance of the leaching process optimization. According to production requirements and production site conditions, additive amount of raw materials in the guidance production process is optimized, a reasonable production plan is developed, problems of insufficient additive amount of the raw materials and excessive additive amount in the production process are solved, the production requirements are ensured, and waste of the raw materials is avoided.

The invention particularly discloses a technology for the secondary recovery of gold from flotation tailings, which comprises the following steps: conducting cyclone classification on ore pulp of the flotation tailings, grinding the cyclone-classified grit as crude ore, conducting ore pulp mixing on the ground ore powder, conducting cyanide leaching of gold, absorbing the leached gold by active carbon, desorbing gold-loaded carbon after saturated adsorption, and electrolyzing the desorption solution after desorption, thus obtaining gold powder. Unlike conventional processes, the technology only needs investment on the power cost of equipment and material cost instead of implementing pit discharging and pit loading by staff and vehicles, therefore, compared with the conventional treatment method, the technology has the characteristics of low cost, large treatment quantity, continuous operation and the capability of enhancing the ore dressing recovery rate by floatation technology to the maximum extent.

The invention relates to a wet metallurgy leaching process optimization method with interval uncertainty. The ore pulp concentration is described by adopting an interval number; and according to the analysis on a reaction mechanism in a gold cyaniding leaching process, a mechanism model of the gold cyaniding leaching process is built by utilizing a material conservation equation and an interval analysis theory. On the basis of the mechanism model, an optimization model taking the maximum economic benefit of the two-stage gold cyaniding leaching process as a target and based on the interval number is built. For the uncertainty optimization model, a two-layer nested improved differential evolution and sequence quadratic programming hybrid optimization algorithm is adopted for performing solving. Finally the influence of the uncertainty level of the ore pulp concentration on the economic benefits of the leaching process is verified through simulation. The model can reflect actual situations of a production process more objectively compared with a traditional model; the adaptability of the model is improved; and therefore, the method has relatively good actual engineering significance.

The invention discloses a method for processing copper-contained gold mud, relating to a comprehensive recovering and processing method of copper-contained gold (silver or gold and silver) mud, in particular to copper-contained gold (silver or gold and silver) mud obtained by zinc powder replacement in the gold production process. The method is characterized by comprising the following steps in the processing process: (1) after the copper-contained gold mud is dried, smelting to obtain copper and gold copper and smelting slag; (2) casting the copper alloy obtained by smelting into an anode for electrolysis, and electrolyzing to obtain cathode copper; (3) after smelting to obtain smelted slag ore grinding, carrying out cyaniding leaching to recover gold and silver; (4) drying the anode mudobtained in step (2); adding slagging constituent to smelt to obtain a gold ingot and smelting slag; and (5) after carrying out ore grinding to the smelting slag obtained by smelting, recovering goldand silver by cyaniding leaching. With the method, the step of dissolving and removing copper by acid in the high copper-contained gold mud processing process is omitted by integrated innovation. Meanwhile, a link of electrolytic copper removal is added to realize zero wastewater emission and consume no medicines, such as sulfuric acid and the like, and meanwhile the electrolytic copper and the gold ingot can be obtained.

The invention relates to a two-stage biological pre-oxidation gold extraction process for Carlin-type gold deposit by two exclusive ore-leaching bacteria. The process comprises the steps of: (1) subjecting the Carlin-type gold deposit to crushing, fine grinding and flotation to obtain flotation gold concentrate, and conducting drug removal treatment on the flotation gold concentrate; (2) employing an exclusive bacterium I to perform first-stage oxidation on the flotation gold concentrate obtained in step (1); (3) employing an exclusive bacterium II to perform second-stage oxidation on the gold concentrate oxidizing slag obtained in step (2); and (4) subjecting the oxidizing slag obtained in step (3) to cyaniding leaching. The exclusive bacterium I is Leptospirillum ferriphilum MJ-CL, and the exclusive bacterium II is Thermoanaerobacteriumsp. L-D. Being able to improve the gold recovery rate, the process provided by the invention has the advantages of small investment, low production cost, and no generation of exhaust gas, is especially suitable for the Carlin-type gold deposit, and can obtain greater economic, social and environmental benefits.

The invention relates to a method for comprehensively utilizing vanadium slag, belongs to the field of resource reclamation, and aims to solve the technical problem of providing the method for comprehensively utilizing the vanadium slag. The method comprises the following steps: a, acid leaching at oxygen pressure, namely at oxygen pressure, adding sulfuric acid into the vanadium slag, stirring and filtering to obtain leaching liquid and leaching slag; b, leaching liquid extraction, namely regulating the pH value of the leaching liquid, and extracting to obtain extraction liquid and raffinate; c, vanadium-containing solution preparation, namely carrying out back extracting on the extraction liquid to obtain subnatant which is the vanadium-containing solution; d, electrolytic manganese preparation, namely regulating the pH value of the raffinate, adding ammonium sulfate and selenium dioxide, and electrolyzing to obtain the electrolytic manganese; and e, titanium dioxide preparation, namely adding sulfuric acid into the leaching slag which is obtained in the step a to perform secondary acid leaching, heating, reducing, freezing, crystallizing, filtering, hydrolyzing, filtering, washing, evaporatively crystallizing and calcining to obtain the titanium dioxide. The method can be used for comprehensively reclaiming and recycling vanadium slag.

The invention relates to a method for recovering zinc from liquid obtained by calcining, acid leaching and copper extraction of gold concentrate containing zinc and copper, and belongs to the technical field of production processes for recovering zinc from the liquid obtained by calcining, acid leaching and copper extraction in metallurgical chemical industries. The method comprises the following steps of: performing acid leaching, extracting, extracting the copper by electrodeposition and adding sodium sulfide into zinc-containing filtrate to precipitate zinc. The method is simple and practicable; and the zinc serving as a valuable metal is recovered while valuable metals such as gold, silver, the copper and sulfur are recovered fully in a process for calcining gold concentrates, so multielement gold-containing gold concentrate resources are utilized effectively, wastes are turned into wealth, the utilization rate of the resources is improved further and the economic benefits of enterprises are increased.

The invention relates to the technical field of mineral dressing and discloses a method for recovering low-grade precious metals from mineral dressing tailings. The method comprises a tailing raw material floating step, a Knelson concentrator gravity concentration step, a Knelson tailing oxidizing roasting pretreatment step, a cinder cyanide leaching step and the like; golds are is enriched in flotation concentrate by tailing flotation; coarse grained golds in the flotation concentrate are recycled by adopting a Knelson concentrator gravity concentration method; Knelson tailings are subjected to oxidizing roasting pretreatment; treated cinder is processed by adopting a cyanide leaching technique to recover fine-grained golds lost in the Knelson tailings. According to the method disclosed by the invention, the recovery of the golds is realized by stages, so that the recovery rate of the golds is improved; the problem that as the flotation tailings are treated by adopting a traditional technique, the recovery rate of the precious metals is low is solved, and the recovery rate of the precious metals is improved; meanwhile, gold concentrate and iron concentrate are produced, so that the comprehensive utilization rate of the tailing is improved; zero discharge of solid waste is realized, the influence of a tailing pond on the surrounding environment is thoroughly avoided, and a pollution source and potential safety hazards are eliminated.

The invention relates to a pressurization, water immersion and oxidation preprocessing cyaniding gold extraction method for difficult-processing gold concentrates, which aims at the gold concentrates with higher sulfur-containing, mainly containing iron pyrite, concomitant with copper pyrite, zinc blende and the like, and comprises the following steps: performing ball-milling on the raw material gold concentrates, performing size mixing, cyaniding for gold extraction after pressurization, water immersion and oxidation preprocessing to obtain a pregnant solution with gold-containing of 0.010 g/L-0.040 g/L, and the gold cyanide leaching rate reaches 96% of a smelting indicator. In the invention, the initial media are neutral, an acid or alkali reagent is not needed, and only the neutral additive lignosulphonate is needed, so that the process cost is reduced, and the extremely high gold recovery rate is realized at the same time.

The invention relates to a method for producing high-purity gold and copper sulphate from gold-bearing copper sludge. The method comprises the process steps of gold-copper separation, high-purity gold production and feed-grade copper sulphate production; in the gold-copper separation, cyanided pregnant solution generated through cyanide leaching of copper-bearing gold ores or carbon adsorption barren solution is fed to a carbon absorption system by virtue of gold-bearing and copper-bearing sludge which has a water content of 90-98% and is generated during an oxidative cyanogen removal process, gold is absorbed by active carbon and finally gold and copper are separated; in the high-purity gold production, a finished gold ingot is mainly prepared by the steps of gold-bearing carbon desorption-electrodeposition, electrodeposition gold sludge purification and ingot casting; and in the feed-grade copper sulphate production, feed-grade copper sulphate and washing solution are prepared by the working procedures of stirring and acid-leaching, evaporation and concentration and crystallization, and copper sulphate impurity removal. The method has the advantages of low treatment cost, strong adaptability, environmental friendliness, capability of realizing reduced, resourceful and harmless treatment on the gold-bearing and copper-bearing sludge, and the like, and is applicable to process of copper-bearing gold ores of which the cyanide soluble copper content is 0.04-0.1%.

The invention relates to a process of comprehensively recovering various metals from limonite and belongs to the technical field of comprehensively recovering various metals. The process comprises the following steps: crushing, ore grinding, classifying, concentrating, cyanide leaching, carbon-in-pulp adsorption, pressure filtration, flash magnetization roasting, magnetic separation and flotation, wherein in the magnetic separation phase, an iron concentrate is obtained; and in the flotation phase, a mixed concentrate of gold, silver and copper is obtained. According to the process disclosed by the invention, by adopting the combined concentration and smelting process flow, concomitant gold, silver, copper and iron in the limonite can be recovered, the recovery rates of the gold and the silver are above 75 percent, the recovery rate of the copper is above 40 percent, and the recovery rate of the iron is above 98 percent, so that the mineral resources are fully utilized, and the economical benefit of an enterprise is also increased.

The invention provides a method for realizing short-process and green cyclic utilization of a cyanogen-containing barren solution. Firstly, reduction precipitation is carried out on the cyanogen-containing barren solution so as to enable SCN <-> and Cu<+> to precipitate to be enriched in residues; the purified barren solution is returned to be subjected to cyaniding leaching or follow-up oxidationtreatment to meet the standard to be discharged; then precipitated residues are transferred to be dissolved in alkali liquor through the alkali liquor so that the SCN<-> can be transferred into the alkali liquor to be used for leaching gold extracting from gold ore or cyaniding tailings, preparing thiocyanate and the like, and the dissolving-transferred residues are returned to the reduction precipitation step so as to reduce the consumption of precipitant, namely, copper salt. The method for realizing short-process and green cyclic utilization of the cyanogen-containing barren solution is high in economic benefit, small in pollution, and capable of protecting the environment.

The invention discloses a cyanide leaching device for gold ore. For overcoming the defects of small aeration quantity, dead zone existence, low leaching rate and high energy consumption in the currently-used agitation leaching groove, a leaching column is novel leaching equipment for combining cyclone separation with pipe flow strengthened leaching and achieving dual goals of grading and leaching in one equipment. According to the cyanide leaching device disclosed by the invention, the inspiratory capacity is increased and the turbulence level of gas, liquid and solid phases is improved by a bubble generator adopting a jet principle, so that the full air amount can be ensured and enough stirring strength is ensured. According to the pipe flow cycle intensifying leaching mode for a coarse fraction refractory leaching gold grain intergrowth body, strong pertinence is realized, the leaching rate of gold ore can be effectively increased and the cyanide leaching process of the gold ore is intensified.

A method for increasing the gold leaching rate through suspension roasting of a carbon-containing gold ore includes the following steps of firstly, breaking and grinding the carbon-containing gold oreto obtain a fine ore; secondly, conveying the fine ore to a pre-oxidizing and suspension roasting furnace, making the fine ore at a suspension state under the action of gas flow and negative pressure, and heating the fine ore to 650-700 DEG C for dearsenification roasting to obtain pre-oxidized and roasted powder; thirdly, introducing the pre-oxidized and roasted powder into a strong-oxidizing and suspension roasting furnace, making the pre-oxidized and roasted powder at a suspension state under the action of gas flow, and performing strong-oxidizing and roasting at 550-600 DEG C to obtain strong-oxidized slag powder; fourthly, grinding the ore after cooling to obtain a secondary fine ore; and fifthly, adding water to prepare ore slurry, then adding sodium cyanide to be evenly stirred forcyanide leaching, and filtering a material subjected to leaching to obtain a liquid-phase gold-containing cyanide leaching solution. The method is high in production continuity and high in adaptability to different ores and equipment can be easily upsized and industrialized.

Disclosed is a non-cyanide leaching agent. The non-cyanide leaching agent comprises thiocyanate, thiourea, thiocyanogen and cyanate. The molar ratio of each component is 4-8:0.5-1:0.5-3:1-2. The non-cyanide leaching agent has the advantages of being high in leaching rate, high in leaching speed, stable in performance, wide in applicable range, low in cost, high in adaptive capacity to environment and simple and convenient in technology, and the leaching rate of gold in sulfuration gold mine with high sulfur and high arsenic and difficult to process is improved to above 96%.

The invention discloses a leaching rate real-time prediction method for a gold cyaniding leaching process on the basis of a serial mixed model, that is, a method for realizing online predication for a leaching rate. The prediction method has the following characteristics that: in the prediction method disclosed by the invention, a dynamic mechanism model for the complete gold cyaniding leaching process, that is, a gold and cyanide ion material conservation equation is established, and the mechanism model is taken as the core of the serial mixed predication model, in this way, the accuracy of a model trend can be ensured; in the prediction method disclosed by the invention, the dynamic reaction speed of the gold cyaniding leaching process is estimated on the basis of a Tikhonov regularization method, and the method is capable of effectively suppressing the influence of a measurement data noise on the estimation result. Unknown parameters in the mechanism model are estimated in a serial form by virtue of a BP neural network data model, thus improving the accuracy and popularization capacity of the model. The prediction method disclosed by the invention has the following advantages that: a serial fixed modelling method combining the mechanism model with a data model is adopted, the existing process priori knowledge is adequately utilized, the prediction accuracy and generalization capacity of the dynamic mechanism model are improved, and the prediction method has the advantages of being simple in structure, high in reliability, high in interpretability, good in popularization capacity, and the like.

The invention discloses a method for treating cyanide gold-extraction wastewater, which comprises the following steps: a shell compound additive is directly added to alkaline cyanide gold-extraction waste liquid so as to remove various harmful impurities affecting the cyanide leaching of gold through a precipitation form; all filtrate is returned to a cyanide gold-extraction system for application through solid-liquid separation; and a filter cake is used for sale as copper concentrate. The method has the advantage of overcoming the defects that the prior acidification method for treating wastewater is long in process, high in cost and incapable of returning all wastewater for application.