肃北某金矿浮选尾矿尼尔森重选实验

Experimental Research on Nelson Gravity Separation from a Gold Mine Flotation Tailings in Subei

肃北某金矿选厂采用浮选工艺处理原矿石,近期由于原矿性质变化较大,金嵌布粒度变粗,造成选厂跑尾严重,尾矿金品位约为0.70~0.90 g/t。工艺矿物学研究表明其主要金属矿物为黄铁矿、黄铜矿,主要脉石矿物为石英、长石、高岭土等,矿物组成较复杂。从尾矿筛析结果来看,金主要以粗、中粒金为主,适宜采用尼尔森进行回收。在扩大重力倍数60 G、流态化水量3.2 L/min、给矿速度10 kg/h、原矿品位0.87 g/t的条件下,可以取得金精矿品位33.42 g/t,回收率35.27%的良好指标。

A gold mine in Subei adopts flotation process to treat ores.Recently,due to the large change of the ore properties,the size of the gold inlay becomes thicker,resulting in gold entering tailings.The gold grade of the tailings is about 0.70~0.90 g/t.Process mineralogical studies show that the main metal minerals are pyrite and chalcopyrite.The mineral composition is more complicated,and the main gangue minerals are quartz,feldspar,kaolin,etc.From the results of tailings screening,gold is mainly composed of coarse and medium-grain,which is suitable for recycling with Nelson.Under the conditions of expanding gravity multiplier 60 G,fluidized water volume 3.2 L/min,feeding rate 10 kg/h,and ore grade 0.87 g/t,a good index of 33.42 g/t gold concentrate grade and 35.27%recovery rate can be obtained.