青海某金矿新建30 t/d选冶中试厂，选冶工艺以浮选和环保提金剂浸出工艺为主，主要针对金矿资源选冶新工艺、新技术、新药剂、新材料和自动化控制等在工业生产应用前的中试验证及优化试验进行系统研究。中试厂原设计流程单一，无法满足工艺流程优化试验研究的需求，通过对该中试厂工艺流程设计进行优化，实现了不同试验工艺流程的组合和调整，在小试研究结果基础上对该矿山2个矿区的矿石分别进行工艺优化中试研究，研究成果成功应用于选厂实际生产中，黄龙沟矿区矿石回收率由77.51%提高至82.48%，年新增产值883.45万元。

A 30 t/d dressing and metallurgy pilot plant have been completed for a gold mine in Qinghai Province.The processing technologies of the pilot plant are flotation and gold leaching by environmental extraction agent.The pilot plant is mainly aimed at the pilot test study for gold ore dressing and metallurgy of new techniques,new materials and new technologies,new reagents and automatic control,etc. At the same time,it can carry out the flotation technology research for nonferrous metals.Mainly equipment in the pilot plant was monitored by frequency conversion,so that it can study the technical measures to improve equipment operation rate.The original design flow of the pilot plant is single,so it cannot carry out process optimization experiment research.Base on optimizing the process designs,different process test can be combination and adjustment.Through the open-circuit tests of laboratory for Huanglonggou gold ore and Shuizhadonggou gold ore in this mine,the recovery rate of the rougher flotation,the once scavenging,the second scavenging,the third scavenging for Shuizhadonggou gold ore is 80.41%,6.55%,1.47%,0.67%,and the grade of secondary cleaning concentrate is 30.40×10^-6,so the suitable flotation process for Shuizhadonggou gold ore is single stage rough two stage cleaning three stage scavenging;the recovery rate of the rough flotation,the once scavenging,the second scavenging,the third scavenging for Huanglonggou gold ore is 75.95%,3.53%,2.32%,1.52%,and the grade of rough flotation concentrate is 29.51×10^-6,so the suitable flotation process for Huanglonggou gold ore is single stage rough three stage scavenging.Based on the results of laboratory tests for these two minerals，the pilot tests were carried out in the pilot plant，which was aimed at demonstrating the results of the laboratory tests.Finally,this research result was successfully applied to the actual production of plants,the flotation process of the second plant was optimized to a single stage roughing three stage scavenging.As a result,the recovery rate of Huanglonggou gold ore is increased to 82.48% from 77.51%,more than 66.88 kg gold is additionally recovered per year,and the annual increase in production value reaches 8 834 500 yuan.