Title:
PRODUCTION OF FINE POWDER OF PRECIPITATED SILICIC ACID HAVING ABRASIVENESS
Document Type and Number:
Japanese Patent JP3719688
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a new method of precipitated-silicic acid production that can produce precipitated silicic acid having high abrasiveness of ≥2mg in abrasion loss of an aluminum plate even without addition of an electrolyte such as sodium chloride.
SOLUTION: This production method produces precipitated silicic acid by feeding an aqueous alkali silicate solution and mineral acid or aqueous mineral acid solution in parallel, substantially continuously, into a reaction vessel. For the production, pH of the reactant solution is maintained within the range of 9-11, the feed rate of the alkali silicate solution is controlled so that the average increasing rate of SiO2 concentration in the reactant solution can be within the range of 40-80g/l.hr, and the SiO2 concentration of the resultant solution at the end of the reaction is brought within the range of 90-130g/l.
Inventors:
Shinji Uchiyama
Application Number:
JP19647395A
Publication Date:
November 24, 2005
Filing Date:
August 01, 1995
Export Citation:
Assignee:
Toso Silica Co., Ltd.
International Classes:
A61K8/00; A61K8/25; A61Q11/00; B24B37/00; C01B33/193; (IPC1-7): C01B33/193; B24B37/00
Domestic Patent References:
| JP7149514A |
Attorney, Agent or Firm:
Patent Service Corporation Patent Office Sykes
Toshio Shiozawa
Masazumi Imamura
Toshio Shiozawa
Masazumi Imamura
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