367 results about "Gold extraction" patented technology

The invention relates to a method of complex utilization of the waste residue that from gold extraction with cyanidation. This invention belongs to the field of metallurgy and chemical technology. Firstly, the waste residue that from gold extraction with cyanidation is pretreated with acid. The floatation process is adopted here. The first step is to concentrate cuprum, plumbum, zincum and argentum; Secondly, collect 47%-52% of the high-grade sulfur and concentrate gold and argentums; Then roast the high-grade sulfur concentrate, the gas is utilized to produce acid, and the waste heat is utilized to produce electricity, and the waste residue is utilized to extract gold with cvanidation. After washing by water, the leavings which contains 62%-68% iron can be used as iron concentrate. Finally, produce slag brick with the refuse. The technology which could reclaim the elements, such as Fe, S, Cu, Pb, Zn, Au, Ag, complex utilizes the waste residue that from gold extraction with cyanidation. The invention takes full advantage of resource. The effect of integrated utilization of resource and the economic benefit are enhanced and the environmental pollution is lessened by this way.

The invention relates to a process for extracting gold from low-grade difficultly-treatable gold ore containing arsenic and carbon. The process is characterized in that: the gold ore has the characteristics of high clay mineral content, large fine ore amount after grinding, and the like. The process comprises the following steps of: grinding raw ore to 10 to -30 millimeters; sieving ore through a sample sieve of 1 to -2 millimeters or washing the ore with water so as to separate fine ore from the ore; floating gold concentrate by using the obtained fine ore; performing direct heap leaching on ore of +2 millimeter and performing biological oxidation; performing medium transformation such as acid washing, water washing, alkali washing and the like on the biologically-oxidized ore and cyaniding directly so as to extract gold, wherein gold is extracted from the floated gold concentrate by biological oxidation-cyaniding and carbon soaking-pressure oxidation-cyaniding and gold extraction or baking, oxidation and cyaniding. Due to the adoption of the process, the problem of permeability of gold ore is solved and the gold extracting rate is effectively increased from 2 to 5 percent during direct heap leaching and cyaniding to 55 to 65 percent. The process has the advantages of simple process, high gold extracting rate, low pollution, high benefit and the like.

The invention relates to a method for extracting copper, lead and zinc concentrates through flotation from tailings from gold extraction of direct cyanidation, belonging to the technical field of methods for extracting copper, lead and zinc concentrates through flotation in industries of gold smelting and chemical engineering. The invention is applicable to tailings from gold extraction of sulfide ores, which is characterized in that: copper, lead and zinc in the tailings from gold extraction are blended adopting the floatation technology; the mixed concentrates of copper, lead and zinc as well as gangue containing sulfur are obtained, and copper concentrate, lead concentrate and zinc concentrate are obtained after separating the mixed concentrates of copper, lead and zinc through floatation. The invention has the advantages of improved integrated resources utilization, reduced environmental pollution and improved economic benefit of the enterprise.

One kind of cyanidation gangue distilling gold technique method including the primary sulfide wrapped gold, first, separate the primary sulfide wrapped gold from concentrated cyanidation gangue by using flotation process method, then grind fine will contain wrapped gold sulfide ore in tower system dipping machine, after grinding, it enter strengthened alkali agitated vessel to do alkalinity normal temperature atmospheric pressure to strengthen pre-oxidation, after the pre-oxidation, add CaO breast to pulp, after pulp, enter cyaniding leaching work, and distill gold high effectively.

The invention discloses a reclaiming method of valency element from acidic rocan biological oxidation extract gold waste liquid, which comprises the following steps: adding acidic rocan biological oxidation extract gold waste liquid and precipitant into autoclave at the same time; depositing selectively; realizing arsenic iron separation; adopting filtering technology; realizing solid and liquid separation; leading solid phase into iron-oxide red preparing process; leading liquid into process of reclaiming rocan; adjusting the solution to neutral with solid-liquid; condensing at 0-4 deg.c; crystallizing to Na2SO4.10H2O; returning the tail liquid to the first process; using to formulating queous alkali. The good effect of this invention can realize effective segregation of rocan and iron of acidic rocan biological oxidation extract gold waste liquid.

The invention discloses a method for extracting gold and silver from acid making high-iron cinder and removing impurities. The method comprises the following steps of flotation of enriched high-sulfur ore from cyaniding-based gold extraction tailings, high-sulfur ore roasting acid production for gold-sliver-enriched high-iron cinder production, high-strength grinding impurity removal of the gold-sliver-enriched high-iron cinder, cyaniding on the high-iron cinder without impurities for gold and sliver extraction, and two-step high-efficiency dehydration. The method prolongs a product resource integrated utilization chain, improves a resource integrated recovery value and product grade quality, realizes thorough utilization of value resources, and has large economic, environmental protection and social benefits.

The invention discloses a selective heap leaching gold extraction process for gold mine containing copper, belonging to the field of hydrometallurgy. The process comprises the steps of: smashing and heaping gold mine containing copper; carrying out alkali treatment on the mine; then adding ammonium salt and sodium cyanide according to a certain proportion to realize the selective leaching of the gold and the restriction to the leaching of the copper; and finally absorbing and extracting the gold from leaching solution by conventional active carbon. The invention has the advantages of simple process method, short procedure, simple equipment, easy implementation, high gold leaching efficiency, low consumption of sodium cyanide, low energy consumption, little investment and low cost, and is the gold extraction method with easy realization of industrialized production and favorable economical benefit.

The invention relates to a method for manufacturing haydite from tailings obtained after gold extraction. The haydite comprises the following specific chemical components: 60-65% of SiO2, 10-20% of Al2O3, 4-8% of Fe2O3 and FeO, 3-6% of K2O and Na2O and 3-5% of CaO and MgO, wherein the ignition loss is 3-5%. The method comprises the following specific steps: dewatering and concentrating the tailings obtained after gold extraction until the water content is 20-40%; then introducing 50-80 parts by dry weight of tailings, 20-50 parts by dry weight of clay (or mud) and 3-6 parts of pore-forming agent, and mulling evenly; and then processing the mixed mud to obtain cylindrical or spherical mud particles with a diameter of 5-20 mm, drying, calcining at 800-1200 DEG C, puffing, then cooling, and grading to obtain the haydite with the required size and bulk density.

The invention relates to a gradient separation and comprehensive recovery method for multiple metallic elements in gold concentrate. According to the process, the first-grade technology is utilizing an efficient mixed activator and a flotation reagent for carrying out pre-flotation on the low-sulfur gold concentrate, the second-grade technology is carrying out alkali leaching cyanide gold extraction on high-sulfur concentrate, the third-grade technology is leaching gold and silver out of low-sulfur tailings through an environment-friendly medicament and a wet method, the fourth-grade technology is giving priority to lead and zinc concentrating for high-sulfur gold concentrate cyanide tailings namely first low-gold high-sulfur concentrate, the fifth-grade technology is selecting copper fromlead and zinc tailings in an activation manner, the sixth-grade technology is roasting acid making and enriching gold, silver and iron to produce iron ore concentrate through copper tailings namely second low-gold high-sulfur concentrate, and the seventh-grade technology is leaching gold and silver out of the iron ore concentrate through an environment-friendly medicament and a wet method. According to the process, the chain for comprehensively utilizing a low-sulfur gold concentrate resource is prolonged, the comprehensive recovery value of the resource and the grade quality of the productsare improved, the complete utilizing of the gold concentrate resource is achieved, and relatively high economic benefits, environment benefits and social benefits are achieved.

The present invention is floating process for enriching Cu, Ag, Au, etc from gold sulfide ore cyanizing gold extraction tailing, and belongs to the field of metallurgical chemical technology. The floating process includes the following steps: 1. setting the tailing into a conditioning tank and regulating the ore slurry density to 40-60 % via stirring at normal temperature; 2. setting into an acidifying tank, regulating the acidity with sulfuric acid to pH 5; 3. adding water to regulate the ore slurry density to 20-30 % and pH to 6 in the conditioning tank while continuous feeding and discharging; 4. adding floating reagent and foamer in a floating tank via stirring; and 5. closed path floating in the floating tank to enrich Cu, Ag, Au, etc. The present invention has simple technological process, high metal recovering rate and other advantages.

The invention disclose a refractory gold concentrate's biological oxidation---an gold extracting technique by thionura-resin ore pulp method, including the following steps: making biological oxidation of gold concentrate, using thionura to extract gold and using resin to absorb the gold, processing the tail solution and then returning it to the mixing pulp work before extraction for circular use; the gold extraction can reach above 90%, the tail solution is circularly used so as to be able to reduce consumption of thionura, sulphuric acid and water, thus reducing production cost and beneficial to environmental protection.

The invention relates to a gold extracting method by thiosulfate using a polyamine compound as an additive, which comprises the steps: after ores are crushed and wet-ground until the fineness is over 90 percent of -200 meshes, 0.03-3mol/dm3 thiosulfate is added to be used as a leaching agent, and then 0.0015-0.09mol/dm3 polyamine compound and 0.0015-0.03mol/dm3 copper (II) ion are added to form a complex ion to be used as an additive to be stirred and leached; and after gold ores are leached, gold from a leaching solution is recovered. The leaching solution is used to extract gold from the ores, so that the gold leaching rate is high, the process operation is simple, the control is easy, the consumption of thiosulfate is extremely low, and the compositions of the gold leaching solution are simple and are favorable for the recovery of the gold; and the application range is wide, the leaching effect is good when the pH value is between 10 and 12, the leaching speed is quick for copper-containing, carbon-containing and other refractory gold ores, quite high gold leaching rate can be maintained, and sodium cyanide and other toxic substances are not used and toxic waste is not discharged in the whole gold extraction process, so the environment is protected.

The invention discloses a method for strengthening gold extraction of an iron gold concentrate roasted product containing sulphur and arsenic. The high-iron gold concentrate containing sulphur and arsenic, especially high sulphur and high arsenic, hinders the subsequent chemical gold leaching process after being subjected to oxidation roasting pretreatment because of the problem that iron oxide is inevitably generated to wrap gold in a high-temperature reaction process. The invention proposes a new method for strengthening gold extraction of the iron gold concentrate roasted product containing sulphur and arsenic by a flow of 'metallized reduction roasting-acid leaching-gold leaching', namely a method for strengthening gold extraction of the iron gold concentrate roasted product containing sulphur and arsenic aiming at the problem. The method comprises the steps of firstly, carrying out metallized reduction roasting on the iron gold concentrate roasted product containing sulphur and arsenic with a reducing agent, carrying out acid leaching on the metalized roasted product, and finally carrying out chemical leaching with an acid slag. By adopting the method disclosed by the invention, the leaching rate of the iron gold concentrate roasted product containing sulphur and arsenic is higher than 95%; and important theory and technical guidance are provided for effective gold extraction of the gold roasted product.

The invention provides a gold extracting agent and a preparation method thereof, and belongs to the technical field of gold extraction. The gold extracting agent comprises the raw material components in parts by weight: 12-12.4 parts of sodium hexametaphosphate, 7-7.4 parts of sodium cyanate, 9.4-9.8 parts of sodium ferrocyanide, 10.3-10.7 of sodium sulfide, 13.3-13.7 parts of sulphur, 10.4-10.8 parts of sodium bromide, 6.3-6.7 parts of sodium chloride, 8.2-8.6 parts of manganese dioxide, 11.8-12.2 parts of urea, and 9.3-9.7 parts of industrial sodium carbonate. The gold extracting agent is alkaline, and has the advantages of low toxicity, environmental protection, short leaching time and convenient transportation and keeping and the like; in addition, the gold extracting rate is high; and the gold extracting agent is quite suitable for use as a novel gold extracting agent for heap leaching, pond leaching and carbon paste production processes of micro-fine particle gold-containing oxidized ores.

The invention discloses a method for extracting gold from copper-containing gold oxide ore, belonging to a wet metallurgy technology. The method comprises the steps of: firstly, crushing, grinding and classifying copper-containing gold oxide ore; then carrying out alkali treatment on the copper-containing gold oxide ore; adding a certain proportion of chelant and sodium cyanide for realizing the purposes of inhibiting copper extraction and selective extraction of gold; and finally, extracting gold from the extract solution through adsorption by using conventional active carbon. The method has the advantages of simple process, simple equipment, easy implementation, high gold extraction rate, less chemical consumption, less investment of capital construction, and low cost, easily realizes industrialized production and has better economic benefit.

The invention relates to a liquid membrane gold extraction-diaphragm electrolysis gold extraction process, which belongs to the metallurgy and chemical industry. The process comprises two parts, namely emulsion liquid membrane gold extraction and gold-contained enrichment diaphragm electrolysis gold extraction, wherein the emulsion liquid membrane gold extraction comprises the preparation of an emulsion liquid membrane, the extraction process of the emulsion liquid membrane, and the emulsion breaking process of a gold-contained emulsion liquid membrane. The process has the advantages that the process has a large driving force of mass transfer, few separation stages needed, and little agent consumption; the process improves the production efficiency and greatly simplifies the gold extraction technical flow; useful materials are reclaimed so as to produce no secondary pollution and achieve the more effective energy utilization; and the process is taken as unit operation, and has flexible use, convenient operation and easy realization of automatic control.

The invention relates to a gold extraction method employing gold cyanided tailing roasting, ultrasonic intensification thiourea gold leaching and activated carbon enrichment, and belongs to the field of wet method metallurgy. According to the gold extraction method, gold-containing cyanided tailing is subjected to roasting treatment, then thiourea is used for leaching gold, meanwhile the ultrasonic intensification treatment is carried out, solid-liquid separation is performed after the gold leaching, gold contained in the liquid phase is gathered by the activated carbon through enrichment, solid-liquid separation is performed after the enrichment, the activated carbon is used for extracting and resolving gold, after resolving, the activated carbon is activated to be recycled repeatedly, a large quantity of thiourea exits in the tail liquid, and the thiourea can be circularly used for the leaching process after being simply treated. The gold extraction method is used for extracting gold in the cyanided tailing through leaching, the leaching speed is high, the extraction rate can be more than 90%, the cycle is short, and the activated carbon and the tail liquid can be recycled, so the production cost is greatly reduced, the economical benefit on the utilization of gold cyanided tailing is improved, and meanwhile, the environmental protection is facilitated.

The invention discloses a method for recovering lost gold-loaded carbon from tailings obtained in a carbon leaching gold extraction process, which is a flotation recovery technology of powder gold-loaded carbon and belongs to the technical field of mineral processing engineering. According to the invention, kerosene is used as a collecting agent to carry out flotation on carbon matter; and after the tailings produced in the carbon leaching gold extraction process is subjected to size mixing, the kerosene is used for carrying out flotation and enrichment on the powder gold-loaded carbon. The method is utilized to recover the gold-loaded carbon lost in the tailings. The method has simple process and high recovery rate and is easy to operate. The loss of gold can be greatly reduced.

The invention relates to a method of collecting iron concentrate from residue of gold extraction with cvanidation. This invention belongs to the field of metallurgy and chemical technology. It is characterized in that : 1. putting the residue of gold extraction into mix-slurry trough 1, adjusting the concentration of the ore slurry with water, mixing round and then putting it into acidification trough 2; 2. adjusting the acidity of ore slurry with industrial vitriol, mixing round continuously, putting it into mix-slurry trough 3; 3. adjusting the concentration of the ore slurry with water, charging and discharging continuously, putting the mixture into mix-slurry trough 4; 4. adding flotation agent and foaming agent, agitating; 5. carrying out closed circuit flotation process after the ore slurry going into the flotation trough, sulfur is concentrated by one step of rougher flotation, two steps of closed circuit scavenging and four steps of closed circuit picking; 6. lifting the sulfur concentration to filter press 9, dehydrating and separating, high grade sulfur is concentrated; 7. lifting the gangue to filter press 7, dehydrating and separating; 8. feeding the high grade sulfur concentrate to acid producing system 10, roasting, the residue is iron concentrate. The invention makes the content of iron in the residue of roasting to 60%-66%, reach the standard of puddling material.

The invention provides a method for recovering iron from a gold concentrate, comprising the following steps: dividing the gold concentrate into a high sulfur part (the sulfur content is more than 47%) and a low sulfur part (the sulfur content is lower than 7%) by a floatation method, wherein the yield of each part is 50%; through separation and flotation, separating the high sulfur part with 47% of sulfur content to obtain the gold concentrate with high contents of gold, copper, lead and zinc and yield of 5% and obtain the gold concentrate in which the part with more than 48.5% of sulfur content accounts for 45%; and performing gold extraction on the part by cyaniding, calcinating cyanided dreg to obtain above 60% iron powder. By using the technology, more than 80% of iron from the cyanided dreg can be recovered; pyrite in the gold concentrate can be firstly purified to enable the purity of the pyrite to be above 90%, and then the pyrite is calcinated to prepare aid and wast heat is used for generating power; and the calcinated dreg has iron content above 60% so as to be served as a raw material for ironmaking in a steel mill, thus realizing comprehensive reclamation.

The invention provides a treatment method of roasting arsenium-containing gold ore concentrate, which relates to gold concentration in a technological process of smelting and extracting gold from gold ore, particularly a treatment method of carrying out pre-oxidizing roasting on arsenium-containing gold ore concentrate. The roasting process adopts a two-stage circulating dust-returning roasting technological process. The method is characterized in that first-stage roasting furnace fume and second-stage roasting furnace fume are respectively and independently subjected to dust collection, and the collected smoke dust is pneumatically delivered back to the second-stage roasting furnace for roasting, and part of the smoke dust is discharged into a water quenching tank to be subjected to water quenching, and is cyanated for gold extraction, wherein the smoke dust, which is pneumatically delivered back for re-roasting, accounts for 90-50% of all the collected smoke dust. The method provided by the invention effectively solves the technical problems of high grade of gold in leaching slag and low recovery rate of gold in the technique for extracting arsenium-containing unmanageable gold ore concentrate, so that the leaching rate of gold in the arsenium-containing gold ore concentrate is increased by 5% or so, and slag gold is reduced from above 4g/t to below 2.5g/t. The invention is widely applicable to the field of gold extraction by roasting and smelting gold ore concentrate.