贵州某黄金选矿厂弱酸性浮选工业试验

摘要

A commercial application test of the weak acid flotation process was conducted on a gold ore from Guizhou Province.The ore has a gold content of 4.3 g/t and gold is mainly present in pyrite,but a high carbon content makes it difficult to be separated and extracted.The ore was first treated by the pre-oxidation under heat and pressure to expose the gold encapsulated inside the mineral,and then the weak acid flotation process was applied to extract the gold-containing sulphide ore.Under the given conditions of the fineness of the ore and the dosage of the flotation chemicals,a final gold grade of 19.34 g/t was achieved with a recovery of 88.25％,after two roughing and two cleaning and four scavenging operation.Different from the previous alkaline flotation process,the waste acid can be recycled during the weak acid flotation.%贵州某金矿含金4.3 g/t,金主要赋存在黄铁矿中,矿石含碳较高,属难选难冶型金矿.为实现该金矿资源的高效利用,采用热恪预氧化打开矿石中金包裹,提高金的浸出率,同时将原有的碱性浮选工艺调整为弱酸性浮选.采用"二粗二精四扫"的选矿流程,进行工业试验.通过条件试验确定磨矿细度及各作业的药剂用量,最终获得金精矿金品位19.34 g/t,回收率88.25％.与原工艺相比,弱酸性浮选可以利用废酸,节约碱性调节剂的使用.