摘要:
本文讨论了一种用于含硫砷碳难浸金矿的全新预处理方法—球团包衣焙烧氧化法。该过程的最大特点是在精矿和粘接剂形成的球团外侧覆盖一层由硫砷固定剂组成的包衣层。球团焙烧氧化产生的二氧化硫和三氧化二砷气体以硫酸钙和砷酸钙的形式被固定在包衣层中,没有二氧化硫和三氧化二砷扩散到大气,不需要烟气净化设施,不会产生环境污染。总结了反应的热力学数据。试验所得指标为:硫固定率大于99.98%,砷固定率大于99.99%,焙砂产率74%(相对精矿),去衣金损失率0.63%,焙砂金浸出率91.71%~92.84%,优于普通焙烧氧化法的78.63%。
关键词:
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难处理金矿
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球团
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包衣
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焙烧
Abstract:
A novel process of Pellet-Enveloping-Roasting (PER) for pretreating refractory gold concentrate that contain arsenic,sulfur and carbon is investigated in this paper.The thermodynamic data is compiled.The pellet that make up of concentrate and binding agent is covered with the envelope that consist of SO2 and As2O3 sorbent.SO2 and As2O3 can be captured by envelope to form anhydrite and calcium arsenate,non SO2 and As2O3 emissions into the atmosphere,non environmental damage,gas treating facilities are not required.The roasting residues and envelope can be effective separated.The results of PER for gold concentrate indicate that up to 99.99% and 99.98% of arsenic and sulfur can be fixed,74% of roasting residues can be gained by concentrate,more than 91.71% gold extraction can be achieved and 78.63% by conventional roasting oxidation.
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