从矿泥坝中回收金的生物预处理

• 作 者: E.N.Lawson 许根福
• 出 处: 湿法冶金
• 发表日期: 1991年02期
• 关键词: 金回收率 矿泥 生物预处理 回收金 生物氧化 黄铁矿 包裹 氧化矿 细菌氧化 焙烧法

普遍认为,残留于Wit watersrand冶炼厂渣中的金,大部分包裹在黄铁矿中。传统的浮选-焙烧法通常回收大约40％的这种金。本文叙述一种非传统方法,它包括生物氧化,这样,金回收率接近80％。本文叙述了在实验室中以及在矿泥坝上所进行的试验。结果表明,在控制pH、湿度和充气的条件下,采用细菌预处理,金回收率明显提高。黄铁矿的生物氧化使包裹的金暴露出来,从而适合于氰化。

It is generally accepted that most of the gold remaining in the Wit Watersrand smelter slag is contained in pyrite. Traditional flotation-roasting generally recovers about 40% of this gold. This article describes a non-traditional method that involves biooxidation so that the gold recovery is close to 80%. This article describes the tests carried out in the laboratory and on the slime dam. The results showed that under the conditions of pH, humidity and aeration, the gold recovery was significantly increased by bacterial pretreatment. Bio-oxidation of pyrite exposes the encased gold to cyanide.