青海某难选含金铁矿石选矿工艺试验研究

Experimental study on the mineral processing process of refractory gold-bearing iron ore from Qinghai Province

摘要: 青海某含金铁矿石金品位2.87 g/t、全铁品位30.67 %，金嵌布状态复杂，回收难度较大，且磁铁矿与黄铁矿、磁黄铁矿等嵌布关系紧密，解离难度大，影响铁精矿质量。针对矿石性质，采用原矿浮选金—弱磁选铁—铁精矿反浮选脱硫—磁选尾矿环保型浸金剂浸出工艺流程，金总回收率可达84.46 %，伴生组分银回收率为89.26 %，铁精矿全铁品位64.15 %、全铁回收率67.63 %，实现了矿石中金、铁及伴生组分银的综合回收。

Abstract: A gold-bearing iron ore from Qinghai contains 2.87 g/t gold and 30.67 % total iron.The embedding status of gold is complicated,making it difficult to recycle gold.The magnetite was closely associated with pyrite and pyrrhotite,making it difficult to disintegrate them,thus the quality of iron concentrates is affected.Therefore,based on the ore property,the flowsheet of gold flotation from raw ores-iron recovery with weak magnetism-desulfurization by reverse flotation of iron concentrates-leaching of magnetic separation tailings with environment-friendly gold leaching agent is adopted and the total gold recovery rate obtained can be 84.46 %,the recovery rate of the associated silver is 89.26 %,the total iron grade in the iron concentrates is 64.15 %,total iron recovery rate is 67.63 %,and the comprehensive recovery of gold,iron and associated silver in ores is realized.