回水可直接回用的硫化铅浮选工艺研究

某铅锌矿含铅1.15%，含锌2.26%，铅锌氧化率均小于8%。针对原铅浮选过程中回水回用导致的铅锌分离难题，采用铅锌等可浮流程，使部分可浮性好的锌矿物与铅矿物同步浮选；在铅精选作业，采取强化抑制措施分离铅锌，获得铅精矿和铅精选尾矿，铅精选尾矿与铅尾矿合并进入锌浮选。试验结果表明：①直接使用回水的条件下，闭路试验取得了与自来水浮选相近的铅精矿指标，铅精矿含铅56.98%、含锌3.85%，铅回收率87.20%。②铅锌等可浮工艺在选厂工业应用，取得了良好的分选指标，铅精矿含铅65.90%、含锌5.04%，铅回收率86.48%；相比原生产指标，铅精矿品位提高了8.43个百分点，含锌降低1.26个百分点，铅回收率提高2.12个百分点。研究成果实现了工业应用，基本消除了回水对铅锌分离的不利影响，具有较强的推广及示范意义。

Reseach on Lead Sulfide Flotation Process with Direct Reuse of Recycle Water

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.