摘要:
还原焙烧-磁选是处理镁质红土镍矿的常用工艺,为考察还原焙烧-磁选过程中各因素对镍分选效果的影响规律,研究以青海某低品位镁质红土镍矿为原料,采用正交试验方法进行试验,并对正交试验结果进行了极差和方差分析.结果表明,料层厚度和磁场强度是影响还原焙烧-磁选镍粗精矿产率及回收率的显著因素,而焙烧温度、焙烧时间以及还原剂用量是影响还原焙烧-磁选镍粗精矿产率及回收率的不显著因素.还原焙烧-磁选分选镍的粗选作业最优条件为:还原剂用量为5%、还原温度为800℃、料层厚度为10mm、还原时间为30min、磁场强度为200kA/m,在此条件下,可获得产率22.88%、回收率38.99%的镍粗精矿.研究对镁质红土镍矿现场生产具有重要的参考意义.
Abstract:
Reduction roasting and magnetic separation are common technologies for treating magnesian laterite nickel ore.In order to investigate the influence of various factors in the process of reduction roasting and magnetic separation on the separation behavior of nickel, a low grade magnesian laterite nickel ore in Qinghai was used as raw material.The orthogonal experiment method was applied, and extreme difference and variance analysis of the results were carried out.The results showed that the material layer thickness and the intensity of magnetic field were significant factors affecting the yield and recovery rate of nickel concentrate in reduction roasting and magnetic separation.While the roasting temperature, roasting time and dosage of reducing agent were insignificant.It also indicated that the optimal conditions for roughing operation of reduction roasting and magnetic separation were determined as follows: the dosage of reducing agent was 5%;the reduction temperature was 800 ℃, the material layer thickness was 10 mm;the reduction time was 30 min;and the magnetic field intensity was 200 kA/m.Under these conditions, a nickel concentrate with yield of 22.88% and recovery of 38.99% could be obtained.The research had important reference values for the production of magnesian laterite nickel ore.
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