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甘肃某金矿石平均含Au 4.3 g/t,为典型的含锑、砷难处理金矿,现场采用“重选-浮选-浮尾氰化”工艺回收Au,但Au的总回收率仅82%左右,浸渣中Au含量高达1.0~1.2 g/t,损失严重。为查明Au损失原因,提高Au回收率,采用矿物解离度分析仪(MLA),并结合传统的光学显微镜分析,对现场的浮选尾矿(氰化浸出给矿)进行了工艺矿物学研究。结果表明,浮选尾矿含Au 2.8 g/t,但Au赋存状态较为复杂,其中仅29.2%的Au以显微金-明金(粒度≥0.1 mm)形式存在,18.8%和48.2%的Au以超次显微金(粒度<0.001 mm)形式赋存于辉锑矿、黄铁矿、毒砂等硫化矿物和石英、白云石、高岭石等硅酸盐矿物中,金嵌布粒度较细和包裹金所占比例较高,难以回收,是Au损失的主要原因。根据工艺矿物学研究结果,对可行的回收方案进行了初步研究。
A gold ore in Gansu contains an average of 4.3 g / t Au, which is a typical antimony- and arsenic-refracturing gold ore. Au was recovered on site using “re-election-flotation-float tail cyanidation” Only about 82%, leaching of the Au content of up to 1.0 ~ 1.2 g / t, the loss of serious. In order to find out the cause of Au loss and improve the recovery rate of Au, mineralogy of mineralization (MLA) was combined with conventional optical microscope analysis to process flotation tailings (cyanidation leaching) the study. The results show that the flotation tailings contains Au 2.8 g / t, but the occurrence of Au is complicated. Only 29.2% of the Au is present in the form of micro-gold-gold (particle size ≥0.1 mm), 18.8% and 48.2% Au is deposited in the form of ultra-micro-gold (particle size <0.001 mm) in sulfide minerals such as stibnite, pyrite, and arsenopyrite, silicate minerals such as quartz, dolomite and kaolinite, Finer and the proportion of parcel gold is high, difficult to recover, is the main reason for the loss of Au. Based on the results of process mineralogy, a preliminary study on a feasible recovery scheme was conducted.