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Gold Ore Beneficiation Process-flotation,amalgamation,gravity separation,Cyanide & Leaching Process

Source: website    AddTime: 2014/9/3    Hits:     Label:

Single flotation is suitable for processing of coarse, medium grain of natural gold ore. The crushed ore into the ball mill, grinding is entered after the flotation pulp. In flotation, sodium carbonate is used as the modifying agent, make gold. At the same time with butyl xanthate and aerofloat as reinforcing agent amine, gold separation powder and slag, output of gold concentrate powder.

Amalgamate flotation is suitable for the treatment of natural gold inlay granularity is coarse, stored in pyrite and other sulfide ores. Unlike the single flotation is mercury plate on the grinding for gold recovery, the recovery rate of up to 30-45%. Amalgamation after flotation pulp, through the classifier overflow. In order to better generation of mercury and gold, grinding add certain concentration of sodium carbonate, sodium hydroxide and so on, can make the mercury gold recovery rate to 70%.

Gravity separation of gold and other minerals flotation using comparable differences. Specific gravity difference is bigger, easy separation. The gold sand into the cylinder screen, flow ore by high pressure water, larger than the screen gravel sand by slipped worse, conveyor belt into the tail mine; less than sieve mineral sands by the male adapter input 1-3 circle jig, through 3 jig concentrate flowing into table, coarse, fine, scavenging, produce fine sand mine. This method is used to mine the ore fine sand, but also can be used.

CIP process this dare is 80's the world's most advanced extraction method, used in the treatment of gold-bearing limonite ore oxidized ore choose don't effect. In 1983, the dressing process for gold deposits in Tongguan China gold company decided to change the reference to the United States, CIP David Mcgee's gold extraction process. At the same time that the CIP process in oxidation leaching, active carbon adsorption, increase gold leaching rate. The process includes: two closed-circuit crushing, two stage grinding, in ballast overflow products - 200 accounted for 95%, and then into the thickener, the slurry concentration by 18-20% concentration is about 42-45%, and then by the buffer tank into the leaching tank, leaching operation, active carbon adsorption and made of coconut shell, the final product of gold loaded carbon. Tailings with high frequency sieve recovery completely broken activated carbon in gold, while the treatment of cyanide containing effluent by liquid chlorine. The gold recovery by analytical, electrolysis, pickling method. Analysis of high concentration of cyanide, high alkalinity, high temperature and high pressure will be carrying gold gold carbon down, then the solution of the electrolytic recovery. Electrolytic cell with steel wool as cathode, stainless steel as the anode, so that the gold adsorption on activated carbon in the steel wool, analytical down with hydrochloric acid washing, attached to calcium carbonate and other impurities, finally regenerated in rotary kiln back in 600 ℃. This process through the implementation of 1986 - 1987 1987 analysis, the leaching rate than in 1986 5 months average index low 5.73 percentage points, to 81.36%. And the leaching rate fluctuations, the most you 33%, up to 98.4%. The reason is the sulfide contents and copper mine in January and May than 1984 respectively by domestic, foreign test results are increased, silver, aluminum, copper also increased significantly, affect the leaching effect of CIP process. It was rebuilt in 1987 a flotation process, the processing part containing high content of copper sulfide mine flotation method, both the use of flotation series of idle equipment, and ensure that the leaching rate of carbon slurry method.

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