甘肃某难选金矿石选矿工艺研究

Study on the beneficiation process of a refractory gold ore from Gansu Province

摘要: 为提高甘肃某难选金矿石选矿指标，根据矿石性质，对比了浮选—尾矿氰化浸出工艺、原矿焙烧—氰化浸出工艺和生物氧化—氰化浸出工艺流程。结果表明：相比浮选—尾矿氰化浸出工艺、原矿焙烧—氰化浸出工艺，在较优条件下，生物氧化—氰化浸出工艺金浸出率分别提高16.67百分点、5.14百分点，且生物氧化具有投资少、能耗低、无污染等优点；生物氧化—氰化浸出工艺更有利于该金矿石的开发利用，金浸出率为85.46 %。

Abstract: In order to improve the ore-dressing index of a refractory gold ore from Gansu Province,based on the ore property,the flotation-tailings cyanide leaching process,raw ore roasting-cyanide leaching process,and biological oxidation-cyanide leaching process are compared.Results showed that with better conditions,the leaching rates of the biological oxidation-cyanide leaching process are 16.67 and 5.14 percentage points higher.Plus,the biological oxidation process requires less investment and low energy consumption and generates no pollutants;the biological oxidation-cyanide leaching process is more conducive to the effective development and utilization of gold and the leaching rate of 85.46 % can be reached.