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研究了矿石 3种预处理方法对以固溶体形态存在于毒砂基质中和以包体形式存在于磁黄铁矿中的金的回收率的影响。所研究的 3种预处理方法包括细磨、高温焙烧 (Prox)和氧化加压酸浸 (PAL)。研究表明 ,未处理的矿石甚至细磨 ( <4 5μm) ,金的回收率也不高。高温预处理使矿石中的硫化物基质分解的程度要比 3h的PAL预处理的分解程度高 ,但是 ,PLA预处理矿石金的回收率要稍好些 ,为 79% ,而高温预处理矿石金的回收率为 75% ,未处理时矿石金的回收率最差 ,为 55-60 %。与未预处理相比 ,两个预氧化过程使氰化浸出时的鼓入的可溶氧气的量大大减少。PAL预处理比高温焙烧预处理要好 ,它可将溶于溶液里的矿物中的砷组份有效的“锁”住。PAL预处理需要较多的石灰来中和分解时所形成的酸。
The effects of three pretreatment methods on the recovery of gold in the form of solid solution in arsenopyrite matrix and in the form of inclusions in pyrrhotite were studied. The three pretreatment methods studied included fine grinding, high temperature calcination (Prox) and oxidative pressure acid leaching (PAL). Research shows that untreated ore is finely milled (<45 μm) and gold recovery is not high. High temperature pretreatment decomposes the sulphide matrix in the ore to a greater degree than the PAL pretreatment at 3 h, however, the gold recovery from the PLA pretreated ore is slightly better at 79%, whereas the high temperature pretreated ore gold The recovery rate was 75%, the ore gold recovery rate is the worst, 55-60% when untreated. Compared with the non-pretreatment, the two pre-oxidation process cyanide leaching when the amount of dissolved oxygen greatly reduced. PAL pretreatment is better than the high temperature calcination pretreatment, it can effectively “lock” the arsenic components in the minerals dissolved in the solution. PAL pretreatment requires more lime to neutralize the acid formed during the decomposition.