Abstract: A leadzinc ore contains lead of 1.15% and zinc of 2.26%,and the oxidation rate of lead and zinc both are less than 8%.Aiming at the problem of lead and zinc separation caused by recycle water reuse in the raw flotation process of lead,the isoflotation process of lead and zinc was adopted to make some zinc minerals with good floatability and lead minerals float simultaneously.In the lead cleaning operation,lead and zinc are separated by strengthening inhibition measures in order to obtain lead concentrate and lead cleaning tailings,and lead cleaning tailings and lead tailings are combined into zinc flotation.The tests results showed that:① Under the condition of using recycle water directly,the lead concentrate indexes were similar to that of tap water flotation.Lead concentrate contains lead of 56.98% and zinc of 3.85%,and lead recovery rate of 87.20% were obtained.② Lead and zinc isoflotation processes have been applied in the concentrator,and a good separation index has been obtained.Lead concentrate contains lead of 65.90% and zinc of 5.04%,and lead recovery rate of 86.48%.Compared with the original production indexes,lead concentrate grade increased by 8.43 percentage points,zinc content decreased by 1.26 percentage points and lead recovery increased by 2.12 percentage points.The research results have been applied in industry,and the adverse effects of recycle water on leadzinc separation have been basically eliminated,which has strong significance of promotion and demonstration.

Key words: lead-zinc sulfide, separation of lead and zinc, direct reuse of recycle water, iso-flotation, industrial application