Title: Method for producing silicon dioxide powder for electronic industry
Application Number: 94111818 Application Date: 1994.07.02
Publication Number: 1114634 Publication Date: 1996.01.10
Approval Pub. Date: Granted Pub. Date: 2000.01.26
International Classifi-cation: C01B33/142,C01B33/148,H01C7/12
Applicant(s) Name: Lei Huixu Address: 610061
Inventor(s) Name: Lei Huixu
Attorney & Agent: HUANG YOULING
Abstract:
     The present invention relates to a production method of silicon dioxide powder for electronic industry. In said invention, industrial sodium silicate and hydrochloric acid are used as raw materials, and its technological process includes: (1) preparation of silica sol by using precipitation reaction; (2) filtering and washing; (3) drying; and (4) calcination. When making precipitation reaction salting-out agent and dispersant agent are added to prevent the solution from transiting from basic range to acidic range or producing gel, and its salting-out agent is ammonia water, and its dispersant agent is any one of alcohol, glycerine, acetone and acetic ether. The silicon dioxide powder material is a high-quality doping material for electronic element, and its various impurity contents are each less than 50ppm, and its Fisher size is less than 0.5 micrometer.
Time: 21
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