6 results about "Cyanide leaching" patented technology

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 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 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.

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 utility model relates to a system of valuable component recovery from high copper iron complex gold extraction carbon calcination slag, including ball mill, the discharge outlet of ball mill is connected with the feed inlet of hydrocyclone through the ore pulp pump, the sand trap of hydrocyclone is connected with the feed inlet of ball mill, the overflow of hydrocyclone is connected with the feed inlet of flotation system, the concentrate of flotation system is connected with calcination ash system, the tailing of flotation system and the slag outlet of calcination ash system are connected with copper leaching tank, and copper leaching tank is connected with copper recovery system and 1# cyanide leaching tank respectively through 1# filter, and 1# cyanide leaching tank outlet is connected with 2# filter, 2# cyanide leaching tank and 3# filter in proper order. The utility model is cleverly combined with the equipment such as grinding classification closed circuit system, flotation system, copper leaching tank, two stage cyanide leaching and copper recovery system, and the efficient comprehensive recovery of gold, silver and copper in high copper iron complex gold extraction carbon calcination slag is realized.

The application discloses a method for quantitatively testing the content and embedded granularity of organic carbon in gold ore, and belongs to the technical field of gold ore detection. The method comprises sample preparation and quantitative testing. The sample preparation uses palm wax as a cementing agent and barite as a standard sample, and the sample to be tested is prepared through melting, mixing, solidification, polishing and carbon spraying. The quantitative testing is based on an automatic process mineralogy testing system, the palm wax background is removed through background deduction, a spectrum library is established to identify organic carbon and barite particles, the area ratio of the two is measured, the mass ratio is converted in combination with the density ratio, the content of organic carbon in the raw ore is inversely calculated, and the granularity distribution of the organic carbon is counted. The application solves the problem that the prior art cannot simultaneously accurately quantify the content and granularity of organic carbon, has the advantages of high testing precision, high efficiency, comprehensive parameters and simple operation, and can provide key data for optimizing the cyanide leaching process of gold ore.