摘要
红土镍矿浸出渣作为硫酸高压酸浸(HPAL)提取镍钴后的尾渣,富含铁、铬等有价金属,其大量堆存既浪费资源又存在重金属污染风险。本文以红土镍矿浸出渣为原料,采用还原焙烧-还原熔炼工艺回收浸出渣中有价金属。试验结果表明,在无烟煤添加量2.0%、焙烧温度为900℃、焙烧时间45 min条件下,浸出渣的硫含量由3.57%降至0.056%,脱硫率达98.69%,有效消除硫对后续熔炼的影响。焙砂在配碳比0.85、碱度0.9、冶炼温度1550℃、冶炼时间30 min工艺条件下进行还原熔炼,铁、铬回收率分别为94.41%和59.79%,获得的合金可替代部分钢铁冶炼原料,熔渣可用于生产活性掺合料。本工艺为红土矿浸出渣的全流程资源化提供了新的技术路线。
Leaching residue of laterite nickel ore,as a by-product of sulfuric acid high-pressure acid leaching(HPAL)for nickel and cobalt extraction,is rich in valuable metals such as iron and chromium.Its large-scale stockpiling is not noly a waste of resources but also has a risk of heavy metal contamination.This study used a reduction roasting-reduction smelting process to recover valuable metals from the leaching residue.The results show that under the conditions of adding 2.0%anthracite,roasting temperature of 900℃and roasting time of 45 min,the sulfur content of leaching residue decreases from 3.57%to 0.056%and the desulfurization rate reaches 98.69%,which can effectively eliminate the influence of sulfur on the subsequent smelting.For reduction smelting of the roasted calcine,under the conditions of carbon ratio 0.85,alkalinity 0.9,smelting temperature 1550℃and smelting time 30 min,the recovery rates of iron and chromium are 94.41%and 59.79%,respectively.The resulting alloy can partially substitute conventional steelmaking raw materials,while the slag is suitable for producing active admixtures.This process provides a novel technical pathway for the comprehensive resource utilization of laterite ore leach residue.
作者
徐郭莉
徐小锋
李冲
李广建
李树超
霍芊羽
XU Guoli;XU Xiaofeng;LI Chong;LI Guangjian;LI Shuchao;HUO Qianyu(China ENFI Engineering Corporation,Beijing 100038,China)
出处
《绿色矿冶》
2025年第3期6-13,共8页
Sustainable Mining and Metallurgy
基金
国家重点研发计划资助项目“含硫铁渣钙/铁分离与高品位铁精粉制备技术与装备”(2021YFC2902504)。
关键词
红土镍矿浸出渣
资源化利用
还原焙烧
还原熔炼
铁合金
leaching residue of laterite nickel ore
resource utilization
reduction roasting
reduction smelting
ferroalloy
