为了回收某石英脉型金矿中的金，在粗磨条件下进行了尼尔森选矿机选矿试验研究。在工艺矿物学研究的基础上，分析了该矿中金矿物的赋存状态及嵌布特性，并结合现场生产中全浮选尾矿中粗粒自然金流失严重的现状，提出了使用尼尔森离心机为主的“重—浮”联合工艺取代原有的全浮选工艺。试验结果表明：在扩大重力倍数为60G、给矿速度为3 kg/min、反向冲洗水压为0.04  MPa、流态化水水量试验为3 kg/min的条件下，尼尔森离心机可实现在粗磨条件下预先回收粗粒自然金矿物。工业试验指标表明，“重—浮”联合工艺相比于单一浮选工艺所获得金精矿中金总回收率提高了19%。

In order to retrieve gold resources from a quartz-vein type gold ore，the dressing tests using Knelson concentrator are conducted under the condition of coarse grinding.Based on the results of process mineralogy，the occurrence state of gold and disseminated features are analyzed.Combined with the production situation of serious loss in the gold tailings in the whole floatation process，the process of gravity-floatation joint technology mainly on Knelson concentrator is put forward to replace the previous whole floatation process.The results show that Knelson concentrator could recycle coarse free gold mineral when the gravity value is 60G，feeding speed is 3 kg/min，counterflush pressure is 0.04 MPa and fluidzed feeding volume is 3 kg/min.The obtained industrial test indexs show that compared with the single floatation technology，the gravity-floatation joint technology can lead to the increase of the recovery rate of gold by 19%.