System and process for improving gold recovery rate through ore grinding secondary precise control grading and pre-recovery

The invention relates to the technical field of gold recovery, in particular to a system and process for improving the gold recovery rate through ore grinding secondary precise control grading and pre-recovery, and is characterized in that the system comprises an ore grinding system, a primary grading system, a secondary grading system, a conventional flotation operation system and a preferential flotation operation system; through ore grinding classification operation, secondary classification, conventional flotation operation, preferential flotation operation and combination of the conventional flotation operation and the preferential flotation operation to form total gold concentrate operation, the system has the advantages of being simple, small in reagent dosage, high in flotation efficiency, high in gold recovery rate and the like. 本发明涉及回收黄金技术领域，具体地说是一种磨矿二次精准控制分级与预先回收提高金回收率的系统及工艺，其特征在于该系统包括磨矿系统、一次分级系统、二次分级系统、常规浮选作业系统、优先浮选作业系统，通过磨矿分级作业、二次分级和常规浮选作业、优先浮选作业、常规浮选作业和优先浮选作业合并组成总金精矿作业，具有系统简单、药剂用量少，浮选效率高，金回收率高等优