水流分级对非晶微硅粉除杂效果研究

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.

Study on Purification Effect of Amorphous Silica Fume by Current Classification

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.