某难选铜镍硫化矿选矿试验研究

某铜镍矿含铜0.23%、镍0.42%,属低品位硫化矿石。矿石中铜矿物大部分为黄铜矿,镍矿物主要为镍黄铁矿,其他金属矿物主要为黄铁矿、磁黄铁矿、磁铁矿。脉石矿物主要有橄榄石、辉石、斜长石、透闪石等。矿物学研究表明,该铜镍矿呈典型的浸染状构造,影响铜镍回收的主要矿物学因素是矿石中黄铜矿、镍黄铁矿的产出形式较为复杂、嵌布粒度较细、形态不甚规则。根据该矿石性质,采用BK303新型高效捕收剂,CMC作脉石矿物抑制剂,通过“两粗两扫三精-粗精矿再磨-中矿顺序返回”的工艺流程,成功实现了铜镍的高效浮选回收,闭路试验获得了铜品位3.29%、镍品位5.32%,铜回收率81.78%、镍回收率71.53%的铜镍混合精矿,取得了良好的浮选指标。

Experimental study on Beneficiation of a Refractory Copper-Nickel sulfide ore

A copper-nickel ore contains 0.23% copper and 0.42% nickel, which is a low-grade sulfide ore. Most of the copper minerals in the ore are chalcopyrite, nickel minerals are mainly pyrite, and other metal minerals are mainly pyrite, pyrrhotite, magnetite. Gangue minerals mainly include olivine, pyroxene, plagioclase, tremolite and so on. Mineralogical study shows that the copper-nickel deposit has a typical disseminated structure. The main mineralogical factors affecting the recovery of copper and nickel are the complex production form of chalcopyrite and pyrite, fine disseminated grain size and irregular morphology. According to the properties of the ore, a new efficient reagent BK303 and CMC were used as collector and gangue mineral inhibitor. Through the process of "two roughing, two scavenging and three finishing, rough concentrate regrinding and middling returning in sequence", the efficient flotation recovery of copper and nickel was successfully realized. The copper-nickel mixed concentrate with copper grade of 3.29%, nickel grade of 5.32%, copper recovery of 81.78% and nickel recovery of 71.53% was obtained in closed-circuit test.