Method for recovering gold from gold-bearing washing mud in gold ore cyanidation system

Abstract

The invention relates to a method for recycling gold for gold-bearing washing mud of a gold ore cyaniding system. The method includes the following wet process-pyrogenic process combined technologicalsteps of crushing and grinding, acid leaching, solid-liquid separation, roasting, size mixing, alkali adjusting, gold extraction with a carbon-in-leach process and screening for solid-liquid separation b; and according to conditions, conventional sulfuric acid is replaced with hydrochloric acid for acid leaching, the weight of samples entering the roasting step can be reduced, the roasting energyconsumption is reduced, the problem of secondary gold wrapping caused by generation of calcium sulfate can be solved, the gold leaching efficiency is improved, the beneficial effects of being simplein process, low in production cost, high in gold leaching efficiency, capable turning waste into wealth, environment-friendly and the like are achieved, efficient recycling of gold-bearing washing mudvaluable resources can be achieved, and the method is suitable for recycling and application of the gold in the washing mud of the gold ore cyaniding system.

Description

Technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for recovering gold from the gold-containing washing mud of a gold mine cyanidation system, and is suitable for the recovery application of gold in the washing mud of a gold mine cyanidation system. Background technique [0002] In the gold production process, the fine-grained materials obtained by washing and grading are generally used to recover precious metal gold by carbon leaching gold extraction process. The company must recycle the cyanide wastewater for reuse. As the cyanide wastewater is recycled and reused, lime is needed to adjust the alkali, which leads to the accumulation of calcium in the leaching system. The carbon dioxide and calcium in the air form calcium carbonate precipitation during aeration and stirring. There is a problem of calcium carbonate scaling in tanks, pipelines and other parts of the cyanide system. When cleaning the cyanide system, the cal...

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Problems solved by technology

[0004] The existing technology mainly includes roasting method, hot-pressed oxidation method and biological oxidation method for the pretreatment of refractory gold ore. For example, Chinese patent CN103122415A has announced "a method for improving the leaching rate of wrapped gold", which promotes the leaching rate through three-stage screening and crushing. It ensures the dissociation of wrapped gold and sulfide monomer, and oxygen-enriched roasting improves the oxidation degree of sulfide. The advantages are simple process, large processing capacity, and easy control of production conditions. The disadvantage is that the gold leaching rate is not high, only about 83%.

Another example is the Chinese patent CN 104694764A which also announces "a method for enhanced leaching of fine-grained wrapped gold". The leaching rate of gold in cyanide slag is high by this method, with an average value of 92.12%. However, due to ultra-fine grinding and hot pressing The equipment cost and energy consumption of the two leaching processes are high, resulting in high production costs

Another example is that Chinese patent CN 101285126A also discloses "a kind of process for extracting gold from refractory gold concentrate with low pollution and high recovery rate", which utilizes the combined process of biological oxidation and microwave roasting, and the gold leaching rate is relatively high, reaching about 94%. The advantage is that the biological oxidation time is long (7 days), and the investment in microwave equipment is large.

[0005] In the prior art, there is no report on the complex and difficult-to-handle gold-bearing materials such as gold-bearing mud washing in cyanidation system

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