Leaching gold with thiourea.

Leaching gold with thiourea is a process used to extract gold from ores or concentrates. Thiourea (CS(NH₂)₂) is a non-toxic alternative to cyanide for gold leaching.

The process involves several steps:

Grinding: The ore or concentrate is finely ground to increase the surface area for leaching.

Thiourea Solution Preparation: Thiourea solution is prepared by dissolving thiourea in water. Sometimes, additives such as sulfuric acid or ferric sulfate are added to enhance the leaching efficiency.

Leaching: The ground ore or concentrate is then mixed with the thiourea solution in tanks or vats. This mixture is allowed to react under controlled conditions (pH, temperature, oxygen levels) for a certain period.

Gold Recovery: After the leaching process, the gold is typically recovered from the solution using various methods such as carbon adsorption, solvent extraction, or precipitation with zinc dust.

Thiourea leaching offers several advantages over cyanide leaching, including:

Environmental Friendliness: Thiourea is considered less toxic and environmentally safer than cyanide.

Selectivity: Thiourea can selectively leach gold from ores containing other metals, such as copper, without dissolving them.

Lower Cost: Thiourea is generally cheaper than cyanide.

However, there are also challenges associated with thiourea leaching, such as slower kinetics, higher reagent consumption, and the need for more stringent process control.

Overall, while thiourea leaching offers a promising alternative to cyanide leaching for gold extraction, further research and development are needed to optimize the process and overcome its limitations.

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Sinhon Chemical focuses on high-quality thiourea production and manufacturing.  The thiourea we produce has high purity, good quality and stable product performance. The annual production capacity is 20,000 tons, the inventory is sufficient, and the supply is stable. We also trade other products, such as molecular sieves, silica gel desiccant, aniline, etc.

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