提高某高镍锍中一次合金回收效果的研究

Research on Improving the Recovery of Once Alloy in Nickel Matte

某高镍锍磨选车间因一次合金回收工艺合理性问题及设备的工作状况问题,一次合金回收效果很不理想,不仅严重影响后续贵金属的回收效果,而且对一次合金的后续冶炼造成不良影响。为确定合理的工艺改造方案,在对一次合金高度富集的二段分级返砂进行工艺矿物学研究的基础上,进行了一次合金高效回收工艺研究。工艺矿物学研究表明:二段分级返砂中的主要矿物为硫镍矿、铜铁镍合金和斑铜矿;硫镍矿和斑铜矿的粒度主要为27～150μm,铜铁镍合金的粒度粗大,70%以上大于75μm;粗粒铜铁镍合金单体解离情况良好,细粒铜铁镍合金则主要与硫镍矿、斑铜矿等连生。实验室试验表明,采用筛出粗粒(+150μm)合金—筛下再磨(-75μm占70%)—弱磁选流程处理二段分级返砂,贵金属的综合回收率大幅度提高至95%以上。按试验确定的方案对现场工艺流程进行优化改造,最终产出的一次合金S综合含量为8.94%,Pt、Pd、Au总回收率分别为99.38%、94.07%、96.12%,明显优于改造前的生产指标。因此,该工艺是一次合金的高效回收工艺,较低的S含量为后续冶炼创造了良好的条件。

Due to the unreasonable once alloy recovery process and the working condition of the equipment in nickel matter grinding-flotation plant,the recovery of once alloy is not ideal,which not only seriously affects the recovery of the followed precious metals,but also adversely affects the subsequent smelting process. Therefore,the study on once alloy recovery was conducted on the mineral process mineralogy research of second stage returning sands from once alloy enrichment,to find out the reasonable process reform project. he mineralogy research shows that the main minerals in the second-stage classifier sand are nickel matte,Cu-Fe-Ni alloy and porphyrite;the particle size of nickel matte and porphyrite is mainly 27~150 μm,and the particle size of Cu-Fe-Ni alloy is coarse,70% or more is larger than 75 μm;the coarse-grained Cu-Fe-Ni alloy have high degree of liberation,and the fine-grained alloy is mainly associated with nickel matte and porphyrite. Laboratory test shows that the coarse alloy screening-re-grinding on the undersize(-75 μm account for 70%)-low intensity magnetic separation is the reasonable process. The total recovery rate of precious metals has increased significantly to over 95%. Optimize the process according to the laboratory test result,the S content of the alloy is 8.94%,the recovery of Pt,Pd,Au are99.38%,94.07% and 96.12%,which is significantly better than the production index before the optimization. Therefore,this process is the reasonable process for the recovery of the alloy,and the lower S content creates favorable conditions for subsequent smelting.