乳化-絮凝对某金尾矿中微细粒金回收的影响

陕西小秦岭某浮选金尾矿中的金矿物粒度微细，主要以自然金和硫化物包裹金形式存在。为充分回收该尾矿中的金，并了解乳化-絮凝对微细粒金矿物的强化回收效果，进行了常规浮选和乳化-絮凝浮选工艺条件对比试验。结果表明，在矿浆浓度为25%、石灰用量为120 g/t、丁基黄药为100 g/t、2#油为12 g/t的情况下1次常规浮选，可获得金品位为14.00 g/t、金回收率为34.50%的金精矿；在矿浆浓度为25%、石灰用量为120 g/t、丁基黄药为60 g/t、2#油为12 g/t、乳化剂月桂酸皂用量为10 g/t、絮凝剂LR用量为20 g/t的情况下1次乳化-絮凝浮选，可获得金品位为17.31 g/t、金回收率为77.14%的金精矿。与常规浮选精矿指标相比，乳化-絮凝浮选在捕收剂丁基黄药用量下降40 g/t的情况下，金精矿金品位提高了3.31个百分点、金回收率提高了42.64个百分点，表明月桂酸皂乳化-LR絮凝可强化细粒金矿物的回收、大幅度地改善浮选精矿指标。

Influence of Emulsion and Flocculation on Gold Recovery from a Micro-fine Particle Gold Tailing

Micro-fine particle gold in a flotation gold tailing in the Xiaoqinling region of Shaanxi Province mainly exist in native gold and the gold inclusion form.The comparative experiments between conventional flotation and emulsion and flocculation flotation were conducted in order to better recover gold in gold tailing and acquaint the reinforcing effect of emulsion and flocculation flotation.The results show that gold concentrate grade of 14.00 g/t and gold recovery rate of 34.50% can be obtained in the conditions of the slurry concentration 25%，lime dosage of 120 g/t，butyl xanthate dosage of 100 g/t ，and No.2 oil dosage of 12 g/t.Gold concentrate with gold grade of 17.31 g/t and gold recovery rate of 77.14% can be obtained in the conditions of the slurry concentration is 25%，lime dosage of 120 g/t，butyl xanthate dosage of 60 g/t，No.2 oil dosage of 12 g/t，emulsifier acid soap dosage of 10 g/t，and flocculant LR dosage of 20 g/t.Compared with conventional flotation concentrate index，gold concentrate grade was increased 3.31 percentage points and gold recovery rate was increased 42.64 percentage points under the condition of emulsion and flocculation flotation.It is shown that emulsion and flocculation flotation can enhance the recovery of fine particles and improve the flotation concentrate index greatly.