低碱条件下高硫铅锑锌多金属的高效分离

Efficient Separation of High Sulfur Lead-Antimony-Zinc Polymetallics Under Low Alkali Condition

广西河池某复杂难选高硫铅锑矿的铅含量为1.12%,锑含量为2.70%,锌含量为3.91%,铅锑主要存在于辉锑矿和脆硫铅锑矿,锌主要以闪锌矿形式存在。针对该矿分选在高碱度条件下锑矿流失严重、在低碱度条件下精矿品位不高,以及各种矿物之间相互包裹嵌布和锌硫含量较高等问题,在低碱条件下使用黄铁矿的新型抑制剂WH90和硫酸锌作为抑制剂,以Pb(NO3)2作为辉锑矿的活化剂,乙硫氮作为铅锑的捕收剂,实现铅锑与锌硫的高效分离;在锌硫分离过程中使用高效低廉的锌捕收剂CZ-08。在抑制剂用量为石灰400g/t、WH9080g/t、硫酸锌700g/t,活化剂用量为硝酸铅400g/t,捕收剂用量为乙硫氮90g/t的条件下,开展一次铅锑粗选、二次扫选、三次精选,锌一次粗选、两次精选、一次扫选的实验室闭路试验,获得的铅锑精矿含Pb 16.35%、Sb 41.76%,铅锑回收率分别为88.66%和94.24%;锌精矿含Zn 61.44%,回收率84.87%。

A complex and refractory high sulfur lead-antimony-zinc ore in Hechi of Guangxi province,contains 1.12%of lead,2.70%of antimony and 3.91%of zinc.Lead and antimony mainly exist in stibnite and jamesonite,and zinc mainly exists in the form of sphalerite.There are some problems in the separation,such as the serious loss of antimony ore under high alkali condition,low concentrate grade under low alkali condition,mutual encapsulation and dissemination of various minerals,as well as high zinc and sulfur contents.In view of these problems,the new inhibitor WH90of pyrite and zinc sulfate were used as inhibitors under low alkali condition,Pb(NO3)2 was used as the activator of stibnite,and ethyl sulfur nitrogen was used as the collector of lead and antimony to realize the efficient separation of lead-antimony and zinc-sulfur.The high-efficiency and lowcost zinc collector CZ-08was used in the zinc-sulfur separation process.Under the conditions of inhibitors amounts with lime 400g/t,WH9080g/t,and zinc sulfate 700g/t,activator amount with lead nitrate 400g/t,and collector amount with sodium diethyl dithiocarbamate 90g/t,laboratory closed circuit tests were carried out for primary lead-antimony roughing,secondary sweeping,and tertiary cleaning,as well as primary zinc roughing,secondary sweeping,and primary sweeping.Finally,a lead antimony concentrate containing 16.35%Pb and 41.76%Sb,with lead and antimony recovery rates of 88.66%and 94.24%,respectively,as well as a zinc concentrate containing 61.44%Zn with a recovery rate of 84.87%were obtained.