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将镍铁渣破碎、球磨后磁选富集Ni于精矿中,富集Cr于尾矿中.磁选后Ni从0.26%富集至2.57%(ω),Cr从4.55%富集至4.61%(ω).考察了H_2SO_4常压酸浸精矿时Ni的浸出规律.结果表明,在酸浸温度110℃、酸浓度220g/L、酸浸时间2 h、液固质量比5的优化酸浸条件下,Ni浸出率为91.5%.在80~120℃内,Ni浸出反应活化能为19.6kJ/mol.Ni浸出反应主要受扩散控制.用Na_2CO_3碱熔焙烧尾矿,在温度1000℃、Na_2CO_3/渣质量比0.65、时间1 h、镍铁渣尾矿粒度<74μm的优化条件下,Cr浸出率为94.1%.
The nickel-iron slag is crushed, and the Ni is enriched in the concentrate by magnetic separation after milling, and Cr is enriched in the tailings, Ni is enriched from 0.26% to 2.57% (ω) after magnetic separation, Cr enriched from 4.55% to 4.61 % (ω) .The leaching behavior of Ni during H_2SO_4 acid leaching concentrate was investigated.The results showed that under the conditions of acid leaching temperature of 110 ℃, acid concentration of 220g / L, acid leaching time of 2 h, liquid-solid ratio of 5 The leaching rate of Ni was 91.5%. The activation energy of Ni leaching reaction was 19.6kJ / mol at 80-120 ℃. The Ni leaching reaction was mainly controlled by diffusion. The tailings were treated by Na_2CO_3 alkali melt sintering at 1000 ℃, Under the optimal conditions of Na_2CO_3 / slag mass ratio of 0.65, time of 1 h and particle size of NiFe slag tailings of <74μm, the leaching rate of Cr was 94.1%.