河南某泥质高氧化型金矿选冶联合回收工艺

Study on the Beneficiation-Metallurgy Process on an Argillaceous High Oxidation Gold in Henan Province

河南某金矿具有嵌布关系复杂、氧化率高、泥化严重等特点,属于复杂难选泥质高氧化型金矿,选矿厂浮选指标不理想。为提高此类矿石的选矿回收率,开展了详细的实验研究,实验研究结果表明:采用单一浸出工艺和预氧化+浸出工艺均很难获得理想的浸出指标,Au浸出率仅为77.46%、80.28%;采用焙烧+浸出工艺可显著提高浸出指标,Au浸出率为93.66%,但技术经济性较差;采用浮选+浸出工艺可获得较为理想的指标,Au总回收率为94.25%,且工艺流程可操作性强。因此,浮选+浸出工艺对此类矿石具有较好的适应性,不仅可回收高度弥散分布在硫化物和脉石矿物中的超细微粒级金,而且粗粒级颗粒金也得到较好的回收。本研究为矿山企业的生产实践提供了重要借鉴。

A gold in Henan Province is a complex and argillaceous high oxidation gold mines,and it has the characteristics of complex embedment characteristics,high oxidation rate and serious argillization,which lead to the poor beneficiation indexes.In order to improve the beneficiation recovery rate of this kind of ore,a detailed test was carried out.The results show that it is difficult to obtain a good leaching index by single leaching process or pre-oxidation-leaching process,and the leaching rate is 77.46%and 80.28%;The leaching index can be significantly improved to 93.66%by roasting-leaching process,but the technical economy is poor.A good total recovery indexes of 94.25%can be obtained by flotation-leaching process,which is highly operable.Therefore,the flotation-leaching process has good adaptability to this kind of ore,which can not only recover the ultra-fine particle gold highly dispersed in sulfide and gangue minerals,but also recover the medium and coarse particle gold.This study provides a reference for the production practice of mining enterprises.