甘肃某细粒铅锌矿工艺优化试验研究

Experimental Study on Process Optimization of a Fine-grained Lead-zinc Mine in Gansu

甘肃某铅锌矿中铅品位为0.74%,锌品位为3.72%,为了实现该矿产资源的高效回收利用,针对铅锌矿物嵌布关系紧密,粒度较细,造成铅锌精矿互含量较高,影响浮选指标的问题,在原矿性质研究的基础上,进行了4种不同方案的工艺流程对比试验。试验结果表明:采用铅锌优先浮选—铅、锌粗精矿均再磨的工艺流程,最终获得的铅精矿铅品位为58.42%,铅回收率为79.95%,锌精矿锌品位为56.27%,锌回收率为93.05%。相较于方案2,锌精矿锌品位提高了3.03个百分点,锌回收率提高了2.75个百分点;相较于方案1现场生产工艺,铅、锌主品位提高,铅、锌互含量显著降低,锌回收率提高了4.15个百分点。

The lead grade of a lead-zinc mine in Gansu is 0.74%,and the zinc grade is 3.72%.In or⁃der to realize the efficient recovery and utilization of the mineral resources,in view of the close distribution of lead-zinc minerals and the fine particle size,the mutual content of lead-zinc concentrate is high,which affects the flotation index,based on the study of the properties of the raw ore,four different schemes of pro⁃cess flow comparison tests were carried out.The results show that the lead concentrate with lead grade of 58.42%and lead recovery of 79.95%and zinc concentrate with zinc grade of 56.27%and zinc recovery of 93.05%can be obtained by adopting the process of lead-zinc preferential flotation-lead and zinc rough con⁃centrate regrinding.Compared with scheme 2,the zinc grade of zinc concentrate is increased by 3.03 per⁃centage points,and the zinc recovery rate is increased by 2.75 percentage points.Compared with the on-site production process of Scheme 1,the main grades of lead and zinc are improved,the mutual content of lead and zinc is significantly reduced,and the zinc recovery rate is increased by 4.15 percentage points.