含难分离赤铁矿的钛铁粗精矿选冶提质工艺研究

Research on the Beneficiation-metallurgy Process of Ilmenite Roughing Concentrate Containing Refractory Hematite

马拉维海滨砂钛铁粗精矿中含钛矿物占有率大于95%,TiO2含量仅为42.71%,部分钛铁矿物赤铁矿化蚀变明显。为确定钛铁粗精矿选冶提质工艺,以该地区海滨砂经重选—磁选工艺处理后获得的钛铁粗精矿为研究对象,通过详细的工艺矿物学研究及条件试验,优化出选冶流程中适宜的工艺参数。钛铁粗精矿焙烧试验最佳的还原条件为:还原焙烧温度875℃、还原时间12.5 min,还原剂用量5%。焙砂经1次弱磁粗选、中磁扫选,最终可获得TiO2含量49.05%、TiO2回收率77.16%的钛铁矿精矿以及Fe含量49.73%、Fe回收率34.61%的铁精矿,TiO2含量从42.71%提高到49.05%,精矿品质得到大幅度提升。该选冶联合工艺流程简单,无药剂污染,可为该类难分离钛铁粗精矿资源的有效利用提供技术途径。

The occupation rate of Ti-containing minerals in ilmenite rough concentrate of Malawi beach sand is more than 95%.But the content of TiO2 is only 42.71%due to the obvious hematitization alteration of some ilmenite.In order to determine the beneficiation and quality improvement process of ilmenite roughing concentrate,the ilmenite roughing concentrate obtained from the beach sand in this area after the treatment of gravity separation and magnetic separation process were regarded as research object.The process of beneficiation and smelting was optimized through detailed process mineralogy and condition tests.The best reduction conditions for the roasting test of ilmenite roughing concentrate were the reduction roasting temperature of 875℃,the reduction time of 12.5 min,and the dosage of reducing agent of 5%.One weak magnetic coarse separation and medium magnetic scavenging were adopted for roasted ores.Finally,the ilmenite concentrate with TiO2 content of 49.05%and TiO2 recovery rate of 77.16%,and iron concentrate with Fe content of 49.73%and Fe recovery rate of 34.61%were obtained.The TiO2 content increased from 42.71%to 49.05%,and the concentrate quality was greatly improved.The combined process is simple and free of agent pollution,which can provide a technical way for the effective utilization of the refractory ilmenite roughing concentrate resources.