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到目前为止,砷仍然是污染环境的毒物,砷的污染重要来源是来自含金硫化矿的选矿。本文记述了采用常用的添加石灰沉淀的方法,并从化学论点进行讨论,以明确阐明本法的必要性和利用限度。砷的硫化矿物在自然pH下略有轻微溶解’但为了回收共生在一起的黄金,通过化学处理后,这些硫化矿转化为易溶的砷化合物。图1是从硫化矿物中回收黄金的工艺流程简图。可以看到,废水中砷的污染是在硫化矿焙烧以后发生的,其反应如下:
So far, arsenic remains a poisonous substance that pollutes the environment. The major source of arsenic pollution is mineral processing from gold-bearing sulfide ores. This article describes the commonly used methods for adding lime deposits and discusses them from a chemical point of view to clarify the need for the law and the limits of use. Arsenic sulfide minerals dissolve slightly at natural pH, but to recover the symbiotic gold, these sulfide minerals are converted to readily soluble arsenic compounds by chemical treatment. Figure 1 is a schematic diagram of a process flow for recovery of gold from sulfide minerals. It can be seen that the pollution of arsenic in wastewater occurs after roasting of sulphide ore and its reaction is as follows: