材料期刊网

利用水流分级原理对冶金硅废弃物微硅粉进行除杂试验研究,确定微硅粉水流分级的最佳固液比为1∶2g/mL,最佳分级次数为4次;使微硅粉纯度提高了4.65％.同时分析了水流分级对微硅粉元素组成、回收率、粒径分布、粒型的影响.结果表明,水流分级使微硅粉中C元素的含量从4.5％降低为0.4％,去除率超过90％,其他杂质元素以硅酸盐或氧化物的形式存在而没被除去;最佳水流分级工艺下微硅粉的回收率为84.5％;水流分级后微硅粉平均粒径由0.334 μm变为0.557 μm,小颗粒被去除;颗粒尺寸更均一,并保持原有的光滑球状形貌.这种方法相比于焙烧除碳,能耗小、对形貌无破坏性,是一种绿色、环保废物再回收的方法.

The current classifier was used as purification equipment to remove the impurities of silica fume.The optimal condition of process were explored:1:2 liquid-solid ration,four times of classification.the content of silicon oxide increased by 4.65％.Meanwhile,the element composition,recovery ratio,size distribution and particle morphology of silica fume were analyzed.The result shows that the content of C element reduces from 4.5％ to 0.4％,removal rate over 90％,other impurity elements that in form of silicate or oxide are not removed;in optimal experimental condition,recovery ratio is 84.5％;average particle size increased from 0.334 μm to 0.557 μm;small particle were removed and particle size becomes more uniform,and the silica particle keep the original smooth spherical morphology.This is a green,environmental friendly waste recycle method which has small energy consumption and no change to the morphology,compared to the roasting process.