两段硫酸化焙烧-水浸从红土镍矿中回收镍钴

以澳大利亚某红土镍矿为原料,采用两段硫酸化焙烧—水浸工艺回收镍钴。重点探讨酸料比、低温焙烧段温度及时间、高温焙烧段温度及时间对镍钴浸出率的影响。结果表明,在酸料比为0.6,一段低温焙烧温度250℃,焙烧时间60min,二段高温焙烧温度650℃,焙烧时间3h的条件下进行硫酸化焙烧,焙烧产物经过水浸,Ni和Co浸出率分别达到93.38%和91.95%。

Recovery of Ni and Co from Nickel Laterite with Two Stages Sulphation Roasting-Water Leaching Process

Ni and Co were recovered from an Australia nonferrous nickel laterite by two stages sulpation roasting-water leaching process.The process and conditions was studied.The effects of acid to materials ratio,roasting temperature and time in low roasting action and high roasting action on Ni and Co leaching rate were investigated,respectively.The results show that the sulfation roasting is performed under the conditions of sulfuric acid to materials ratio of 0.6,first low temperature roasting temperature of 250 ℃,roasting time of 60 min,second high temperature roasting temperature of 650 ℃,and roasting time of 3 h.The roasted product is subjected to water leaching,and the leaching rate of Ni and Co are up to 93.38% and 91.95%,respectively.