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采用搅拌过滤法对Aghdareh金矿样品进行金的萃提。矿物学研究表明,样品中58%的金颗粒小于10μm,该等级的3%属于难熔金。实验结果表明,在最优条件下,金回收率可达91.8%,银和汞分别为41.5%和10.2%。以氰化法测试的6种分次尺寸样品的结果表明,未萃取的金粒子大多小于25μm,还有大约5%的金颗粒大于25μm。因此,对样品要进一步粉碎,这样可使金和银回收率分别提高约3.57%和约5%,进一步粉碎样品并不影响汞的回收率。采用Knelson重力选矿法可提高汞回收率并防止金和汞的混合,利用氰化法检测重力法的尾料。这些方法的结合应用,最终使金回收率达到93.3%,汞回收率增加到42.16%,而银回收率没有明显的变化,为42.17%。
Aghdareh gold samples were gold extracted by agitation and filtration. Mineralogical studies have shown that 58% of the gold particles in the sample are less than 10 μm, and 3% of this grade is refractory gold. Experimental results show that under optimal conditions, the gold recovery rate of 91.8%, silver and mercury were 41.5% and 10.2%. The results for the 6 graded samples tested by the cyanation method showed that most of the unextracted gold particles were less than 25 μm and about 5% of the gold particles were larger than 25 μm. Therefore, further crushing of the sample results in an increase of about 3.57% and about 5%, respectively, in gold and silver recovery. Further crushing of the sample does not affect mercury recovery. Using Knelson gravimetric beneficiation method can increase mercury recovery rate and prevent the mixture of gold and mercury, the use of cyanide method to detect gravity tail. The combined application of these methods eventually led to a gold recovery rate of 93.3%, a mercury recovery rate of 42.16%, and no significant change in silver recovery rate of 42.17%.