河南某泥质高氧化型金矿选冶联合回收工艺

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。

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

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.