Study on Harmless Disposal Process of Beneficiation Tailings for a Gold Mine in Fujian Province

Abstract

In order to promote the sustainable development of a gold mine in Fujian Province, based on the upstream beneficiation process and indicators, the treatment of beneficiation tailings (carbon leaching tail pulp and heap leaching residues) was studied in detail. The results showed that: Applying alkali-chlorination (bleaching powder) process in treatment for the cyanide containing waste liquid in carbon leaching tail pulp, the cyanide can be effectively removed, the CN- concentration is reduced from 250 mg/L to 0.217 mg/L, and the removal rate is more than 99.90%. The test index is successfully applied to the production practice, and the effect is also remarkable. The developed beneficiation tailings harmless disposal process, that is, solid slag muck (carbon leaching and heap leaching residues) mixed emissions for ecological restoration, carbon leaching wastewater after reaching the cyanide concentration standard is recycled or discharged according to the actual production, which greatly saves the storage capacity of tailings pond and reduces the occupation of waste dump. The production practice can provide basic basis for the end treatment of beneficiation tailings in the same type of gold mines.

Keywords

• carbon leaching tail pulp
• heap leaching residues
• alkali-chlorination (bleaching powder)
• harmless disposal