某低品位斑岩型铜矿选别流程对比试验研究

Comparative experiment study on beneficiation process flow of a low-grade porphyry copper ore

针对某新建低品位斑岩型铜矿的铜资源及伴生金属储量大,但其主伴金属原矿品位低、地处高海拔地区等不利特点,借鉴国内外同类型矿山选别流程应用经验,结合该斑岩型铜矿矿石类型、性质、浸染特性和有用成分种类及含量等因素,开展了优先浮选、分支浮选、等可浮选和混合浮选等选别流程的试验研究。试验结果对比分析表明,该斑岩型铜矿适宜采用铜钼混合浮选再分离的选别流程。获得了较好指标:铜精矿品位25.19%,回收率89.93%;钼精矿品位46.87%,钼回收率76.15%;铜精矿中含金、银分别为3.5 g/t、56.8 g/t,其回收率分别为64.68%、74.39%。

The copper minerals and associated metal resources in a newly-built low-grade porphyry copper mine was extraordinarily large, but the grade of that was low, and it was located at high elevation and so on. In order to develop it effectively and economically, beneficiation process flow applied in the same type mines at home and abroad was used for reference. Based on ore type, properties, disseminated characteristics as well as type and content of valuable minerals, the experimental study on preferential flotation, branch flotation, iso-flotation and bulk flotation were separately carried out. Comparison of experimental results indicated that the bulk flotation and then separation for copper and molybdenite was the most suitable for the porphyry copper ore. The bulk flotation obtained the best indexes： grade of the copper concentrate was 25.19%, recovery was 89.93%; grade of the molybdenite concentrate was 46.87%, recovery was 76.39%; in the copper concentrate, Au content was 3.5g/t and silver content was 56.8g/t, Au recovery and silver recovery separately were 64.68% and 74.39%.