Cyanide Extraction Process of Gold Ore

Cyanide gold extraction is a method that is widely used in gold beneficiation process. For flotation gold concentrates and low-grade gold-bearing oxide ores, cyanide gold extraction can be said to be the most suitable method.

Process principle:The cyanide-zinc replacement process is used to treat the gold-containing leaching solution after cyanidation leaching. The principle is to use zinc as a reducing agent to replace gold and silver from the leaching solution, replacement, etc.

Process flow:The cyanide-zinc replacement process mainly includes three processes: leaching, washing, and replacement (precipitation):
①Leaching - The solid gold in the ore is dissolved in an oxygen-containing cyanide solution.
②Washing - recover the gold-containing solution after leaching, wash the surface of the ore particles and the melted gold between the ore particles with water to achieve solid-liquid separation.
③Replacement - use metal zinc in the gold-containing leaching solution to reduce and precipitate it to recover gold.

Process principle:The carbon slurry gold extraction method, also known as the all-slime cyanidation method, is a method in which activated carbon is put into the cyanide pulp, so that the dissolved gold is adsorbed on the activated carbon, and then the gold is extracted from the activated carbon. It mainly includes the preparation of leaching raw materials, stirring leaching and countercurrent carbon adsorption, gold-loaded carbon desorption, electrowinning and electrolysis, smelting and ingot making, and carbon regeneration. It is suitable for gold mines with low sulfur and silver content and high mud content, and the recovery rate can reach more than 90%.

Process flow:The process steps of gold extraction by carbon slurry method mainly include preparation of leaching pulp, cyanidation leaching, activated carbon adsorption, gold-loaded carbon desorption, electric shock to obtain gold mud, de-gold carbon recycling, and treatment of leaching pulp. There are seven working stages.
①Preparation of leaching pulp: crush the gold-containing ore to a particle size suitable for cyanidation leaching, and remove impurities from the pulp, mainly to remove wood chips to prevent it from clogging the carbon screen.
②Cyanide leaching: stirring and leaching the pulp with the aid of chemicals.
③Activated carbon adsorption: The pulp after cyanidation leaching is introduced into the adsorption tank, and the dissolved gold in the pulp is adsorbed by activated carbon, thereby becoming gold-loaded carbon.
④Desorption of gold-loaded carbon: The gold-loaded carbon is separated from the pulp by means of a carbon extraction screen, and the gold complex is replaced in the desorption system.
⑤Gold mud obtained by electric shock: The precious liquid obtained by desorption of gold-loaded carbon is recovered by electric shock to obtain gold mud.
⑥Recycling of de-gold carbon: After desorption, activated carbon is treated to remove other aggregates and then enter the adsorption tank for recycling.
⑦Treatment of leaching pulp: The leaching pulp containing cyanide cannot be directly discharged, and can be treated by means of sodium hypochlorite generator or chlorine gas, acidified volatile alkali liquid absorption method.

Process advantages

Mecru Heavy Industry uses an oxidant (pure oxygen or oxide) in the leaching process and uses an oxygen-added carbon leaching process, such as oxygen resin leaching. It can effectively improve the leaching rate of gold and silver; accelerate the leaching speed and shorten the leaching time; and reduce the consumption of cyanide and lead nitrate.

The cyanide gold extraction method of Mecru Heavy Industry adopts the process of leaching while grinding, which strengthens the leaching effect and improves the leaching rate of gold.

The reason why you choose us?

Since we were established, Mecru Heavy Industry has been devoted ourseleves to the research, development and innovation of mineral processing technology as well as equipments so as to deal with the various technical problems which may encounter in the mine.

Mecru's customized beneficiation solutions achieve excellent returns on investment by increasing output of plant, concentrate grade and comprehesive recovery rate. At the same time the influence on the environment is minimal.

After years of delving in the mineral processing industry, Mecru Heavy Industry has continuously enlarge the innovation in the mineral processing process system. In the years of practice, Mecru has constantly improved the mineral processing process,which is aiming to provide customers with more environment-friendly and efficient mineral processing process and better, more meticulous, thoughtful services. 

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