针对传统硫酸化焙烧红土镍矿能耗高、设备腐蚀大等缺点,提出硫酸氢铵焙烧循环工艺.以菲律宾红土镍矿为原料,对焙烧剂添加量、焙烧温度和焙烧时间等工艺参数及焙烧机理进行研究.结果表明:焙烧温度300℃、焙烧时间90 min的条件下,Ni、Co、Mn、Mg、Fe的提取率分别为95%、96%、92%、57%、79%,硫酸氢铵具有良好的硫酸化能力.该工艺具有效率高、能耗低、环境友好等特点,对低品位红土镍矿的开发利用具有重要意义.
@@@@The circular technology of sulfation roasting nickel laterite ore using ammonium bisulfate was supposed to overcome the defect of traditional process, such as high power consumption and equipment corrosion. Using Philippines nickel laterite ore as raw material, the roasting mechanism and various parameters including ammonium bisulfate addition, roasting temperature and roasting time were investigated. The results show that, under conditions of 300 ℃and 90 min, the extraction rate of Ni, Co, Mn, Mg and Fe are about 95%, 96%, 92%, 57%and 79%, the sulfating ability of ammonium bisulfate is strong. The process is proved to be significant in exploitation and utilization of low-grade nickel laterite ores, which has some advantages, such as high efficiency, low power consumption and good environment.
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