Use of Ozone for Gold Extraction from a Highly Refractory Concentrate
Use of Ozone for Gold Extraction from a Highly Refractory Concentrate
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使用臭氧从高难熔精矿中提取金
DOI：
10.1080/01919512.2011.536507
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
E. Pecina
中科院分区：
文献类型：
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作者：
J. A. González;F. Nava;E. Pecina
贵金属通常通过氰化物浸出从矿石中回收。当金或银被锁在矿物基质中时，它们保持不可回收，并且矿石被分类为难氰化的。评价了在酸性介质中对毒砂-黄铁矿型高难处理金精矿（110 g Au/t）进行的氰化预处理。虽然这种精矿的常规氰化只能回收9%的金，但在氰化前用臭氧预处理可将金回收率提高到23%。其余的金与基体固溶。即使金提取量的增加不足以经济地处理这种特定的精矿，但它表明，锁定在黄铁矿或毒砂中的金可以通过在氰化之前对矿石进行臭氧化来回收。
Precious metals are generally recovered from their ores by cyanide leaching. When the gold or silver are locked up in the mineral matrix, they remain unrecovered and the ore is classified as refractory to cyanidation. Ozonization in acidic media of an arsenopyritic-pyritic highly refractory gold concentrate (110 g Au/t) as a treatment prior to cyanidation was evaluated. While the conventional cyanidation of this concentrate recovers only 9% of the gold, a pretreatment with ozone before the cyanidation increases the gold recovery to 23%. The rest of the gold is in solid solution with the matrix. Even if this increase in gold extraction is not large enough to economically process this specific concentrate, it demonstrates that the gold locked up in pyrite or arsenopyrite could be recovered by ozonating the ore before cyanidation.