Process for extracting gold from gold ore containing copper by using ammonia, cyanide and carbon

Abstract

The invention relates to a process for extracting gold from gold ore containing copper by using ammonia, cyanide and carbon. The process sequentially comprises the following steps: smashing, grinding and thickening, i.e. smashing and grinding the gold ore containing copper until the ground gold ore containing copper with grain size of -0.075 mm accounts for 80-95% and then thickening to obtain thickened ore slurry, wherein the concentration is controlled at 35-48%; extracting while inhibiting copper extraction, i.e. adding lime milk, ammonium salt and sodium cyanide in the thickened ore slurry and extracting while inhibiting copper extraction for 12-36 hours while controlling the pH value at 7-11, the total ammonia concentration at 200-1000 ppm and the total cyanide concentration at 20-500 ppm to obtain extraction ore slurry; carrying out carbon extraction on the extraction core slurry for 24-48 hours while controlling the carbon density at 10-30 g/L to obtain gold loaded carbon with high copper content and tailings; and decoppering and extracting gold, i.e. adding sodium cyanide with the concentration of 3-20% to the gold loaded carbon with high copper content according to the liquid-carbon ratio of (3-10) to 1, decoppering for 10-48 hours to obtain decoppered gold loaded carbon and decoppered cyanide solution, carrying out high-temperature non-cyanide desorption and electro winning, purification and ingot making on the decoppered gold loaded carbon to produce gold ingots, and recycling tailing water and decoppered cyanide solution. The process for extracting gold from gold ore containing copper by using ammonia, cyanide and carbon disclosed by the invention has the advantages of short process flow, small investment, low operation and control difficulty, small consumption of reagents, low production cost and the like, and is suitably applied to difficultly-beneficiated-and-smelted gold ore containing copper, and the influence of copper on gold extraction procedures is thoroughly overcome.

Description

technical field [0001] The invention relates to a hydrometallurgical gold extraction process, in particular to an ammonium cyanide carbon leaching process for copper-containing gold ores, which is suitable for the application of copper-containing gold ores that are refractory to separation and smelting. Background technique [0002] With the in-depth development of the mining industry, the gold ore resources that are easy to be smelted are increasingly exhausted, and the complex and difficult-to-handle polymetallic gold ore will become the main object of development in the future. Among them, copper-bearing gold ore is a typical refractory ore, and it is also an important gold resource in my country. China's gold production bases Shandong, Fujian, Henan and other provinces store a large amount of copper-bearing gold ores, and copper ores in Jiangxi, Anhui, Hunan and other copper bases in the middle and lower reaches of the Yangtze River are also commonly associated with gold...

AI Technical Summary

Problems solved by technology

[0003] Today, there are still many problems in the treatment of copper-bearing refractory metallurgical ores, mainly in the following aspects: First, the direct cyanidation process will cause a large amount of copper to be dissolved and produce high-copper-loaded gold charcoal, which will increase the difficulty of the subsequent gold extraction process. Also lead to high consumption of sodium cyanide, higher process costs and other issues; the second is the use of acid leaching to remove copper and then cyanide to extract gold, the process is long, and it is difficult to extract all the copper, and there is still a problem with the follow-up process. Adverse effects and higher process costs

[0004] In order to solve the above problems, Chinese patent CN101818247B discloses a "selective heap leaching gold extraction process for copper-containing gold ores". Copper-bearing ores with low requirements for leaching particle size, otherwise the gold leaching rate will be low, which will affect economic benefits and other issues

Similarly, Chinese patent CN102690957A discloses "a method for extracting gold from copper-containing oxidized ore gold ore". This invention uses a chelating agent and sodium cyanide to suppress copper and leaching gold, and the leachate uses activated carbon to absorb and extract gold. Multi-stage washing is required to produce rich liquid, the investment and operating costs are high, and the problem of copper accumulation in the system has not been solved

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