Improving gold extraction and economic efficiency by testing intensive leaching processes

¹ Dushanbe branch of National University of Science and Technology “MISIS”, Nazarshoeva Steet, 7, Dushanbe, 734042, Tajikistan
² MSU Branch in Dushanbe, Bohtar Street, 35/1, Dushanbe, 734003, Tajikistan

^* Corresponding author: boboevi@misis.ru

Abstract

In this paper the possibility of existing methods of intensification of the cyanidation process of gold-bearing raw materials of nonrefractory type was considered: cyanidation with the supply of oxygen or air during the process and with the use of water pre-saturated with dissolved oxygen. When using air in the process of cyanidation with the supply of water pre-saturated with oxygen, the recovery of gold at the level of 83.9% was achieved at a duration of 16 hours and was the most effective. The research revealed a surprising phenomenon related to the low rate of decrease in dissolved oxygen concentration, which does not follow Guerney's law. At the transition from distilled to mineralized (recycled) water, the rate of oxygenation increases while deoxygenation decreases. Preservation of oxygen in the pulp volume gives the possibility to further intensify the cyanidation process.