低品位硫化铜镍矿的特性与浮选工艺研究

Characteristics and flotation separation of law grade sulfide nickel-copper ore

新疆哈密某低品位硫化铜镍矿石中含镍0.332%、含铜0.208%,目的矿物共生关系复杂、嵌布粒度细,矿石中含镁脉石矿物含量高、可浮性好。为了充分回收矿石中铜镍矿物并降低精矿中的MgO含量,以六偏磷酸钠和CMC作脉石矿物抑制剂,硫酸铜为活化剂,戊黄药、Y-89、丁胺黑药混合为捕收剂,采用"两粗三扫三精"的原则工艺流程,闭路试验获得铜镍混合精矿中镍品位为5.123%,镍回收率为77.80%;精矿中MgO含量为6.11%,达到了冶炼的要求。尾矿中的镍矿物多为不可浮的氧化镍和硅酸镍,工艺流程能较好地适合该矿石性质。

A low grade refractory sulfide nickel-copper ore from Hami district of Xinjiang Uygur Autonomous region contained nickel 0. 332 % and copper 0. 208 %. The relationships between minerals and gaugues were complex and particle sizes of valuable minerals were fine,and the gangues in the ore are high in magnesium content and good in floatability. Flotation reagents have settled by six sodium hexametaphosphate and CMC as gangues; depressors, sulfate copper is uesd as activator, and amyl xanthate, Y-89 and butylamine aerofloat as mixed collectors in odter to make full recovery of the valuable nickel and copper minerals and decrease the content of MgO in the concentrate. After the closed-circuit flotation process of two roughing-three scavening-three cleaning,the final concentrate with niekle grade of 5. 123%, nickle recovery of 77. 80%. The concent of MgO in the concentrate is only 6. 11%, according with the requirement of smelting. Most of the nickel minerals in the railings are non-floating oxide nickel and silicate nickel. This indicates that the flotation process can be well suited to the nature of the ore.