Abstract:

In the process of cyanide production，the gold concentrate fineness entranced the cyanide system is very important for leaching indicators.In order to improve the cyanide leaching rate，it is needed to make full use of existing equipment resources in the production practice of concentrator.Gather and analyze the related data of regrinding and grinding classification system，the reasonable process parameters have been determined.Optimized and adjusted to a series of parameters-milling rotational speed，grinding medium，cyclone parameters，and ore feeding and ore exhausting，to improve the gold concentrates fineness in stages.Finally，the content of gold concentrates fineness （400 meshes） increased up to more than 90%，and the leaching recovery rate increased by 0.17%.It has reached the purpose of reducing electricity consumption of the grinding classification system and cutting the cost to increase the profit.

Key words: grinding fineness, leaching recovery rate, cyanide system, gold concentrates