四川某硫化铅锌矿石铅浮选工艺优化研究

Research on Optimization of Lead Flotation Proceesing of a Lead-zinc Sulfur Ores in Sichuan

四川某硫化铅锌矿铅锌品位低,含硫较高,矿石中部分方铅矿、闪锌矿嵌布粒度较细,呈细脉状、浸染状嵌布,影响铅锌浮选分离指标。在现有的分选工艺流程下,铅精矿中含锌较高,影响锌回收率。为此,在工艺矿物学研究基础上,开展了铅浮选工艺优化试验研究。新工艺采用25^(#)黑药作选铅捕收剂,铅粗精矿进行再磨,降低了铅精矿锌含量,提高了铅精矿铅品位和锌精矿锌回收率;小型闭路试验在原矿含铅1.21%、含锌2.19%、含银25.48 g/t的条件下,可获得含铅45.58%、含锌5.43%、含银861.72 g/t,铅回收率84.11%的铅精矿;含铅1.11%、含锌54.10%,锌回收率87.14%的锌精矿。铅精矿、锌精矿的品位分别较现场工艺提升2.42、3.72个百分点,铅、锌回收率分别提高0.26、4.11个百分点,研究结果为该铅锌矿的实际生产提供指导。

A lead-zinc sulfide mine in Sichuan has low lead-zinc grades and high sulfur content.Some galena and sphalerites in the ore have finer grain sizes,vein-like and disseminated inlays,which affect the separation indexes of lead-zinc flotation.Under the existing separation process,the zinc content in the lead concentrate is relatively high,which affects the zinc recovery rate.For this reason,on the basis of the research of process mineralogy,an experimental study on the optimization of the lead flotation process was carried out.25^(#)areofloat was used as the lead collector in the new process and the lead coarse concentrate is reground to reduce the zinc content in the lead concentrate,improve the lead grade of the lead concentrate and the zinc recovery rate of the zinc concentrate.Under the conditions of 1.21%of lead,2.19%of zinc and 25.48 g/t of silver in the raw ores,lead concentrate with lead grade of 45.58%,zinc contents of 5.43%,silver contents of 861.72 g/t and lead recovery rate of 84.11%,and zinc concentrate with lead contents of 1.11%,zinc grade of 54.10%,and zinc recovery rate of 87.14%could be obtained.The grades of lead concentrate and zinc concentrate were increased by 2.42 and 3.72 percentage points compared with the on-site process,respectively,and the lead and zinc recovery rates were increased by 0.26 and 4.11 percentage points respectively,which provides guidance for the actual production of the lead-zinc ore.