Theground fineness,product purity and surface modification are the keyfactors to develop the quartz micropowder technique,when DG mag-netic separator and SXG scrubber arc used to upgrade the quartzpowder,the product qualityc an be up to the standard of a Japaneseelectrical company,and the content of Fe,K,Na are reduced to vari-ous extent,the whiteness is improved.