铜镍氧硫混合矿焙烧-浸出过程铜、镍、铁的转化

Transformation of cooper,nickel and iron of oxide-sulfide mixed copper-nickel ore during roasting-leaching process

随着硫化镍矿资源的日趋枯竭,铜镍氧硫混合矿的利用将会愈发受到关注。通过对原矿进行差热-热重、XRD以及热力学分析,揭示焙烧过程矿石矿相的转变历程,研究铜镍氧硫混合矿焙烧过程中矿物粒度、焙烧温度和焙烧时间对铜、镍、铁转化的影响,探索浸出过程中溶剂、液固比、浸出温度及浸出时间对铜、镍、铁浸出的影响。结果表明:矿物粒度为74~80μm、焙烧温度为600℃、焙烧时间为2 h、选择水作为浸出溶剂、浸出温度为60℃、液固比为6:1、浸出时间2 h时,镍和铜的浸出率达到最高分别为46.25%和96.27%,铁的浸出率低于1%。

With the resource shortage of nickel sulfide ore, the new process is needed to treat the oxide-sulfide mixed copper-nickel mixed ore. DTA-TG and XRD of ore at different roasting temperatures and thermodynamic analysis were used to reveal the phase transition at the roasting stage. The influences of mineral particle size, roasting temperature and roasting time on the element transformation of copper, nickel and iron were studied at the roasting process of oxide-sulfide mixed copper-nickel ore. The influences of different leaching solvents, liquid-solid ratio, leaching temperature and leaching time on the leaching of copper, nickel and iron were studied during leaching process. The results show that when the particle size of mineral powder is 74-80μm, the roasting temperature is 600℃, roasting time is 2 h, using water as solvent, leaching temperature is 60℃, liquid-solid ratio is 6：1 and leaching time is 2 h, the leaching ratios of copper and nickel reach the maximum, 46.25% and 96.27%, respectively.