Title:
PRODUCTION OF ACID RESISTANT SILICEOUS FILTER ASSISTANT
Document Type and Number:
Japanese Patent JP3035621
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To efficiently produce a siliceous filter assistant having an excellent filter characteristic and a high specific surface area, especially excellent in acid resistance and without containing an org. matter and an iron content.
SOLUTION: In the method, an aqueous slurry containing a silica raw material and a lime raw material in a proportion of CaO/SiO2 mol. ratio of 0.3-1.2 is applied to a hydrothermal reaction by heating at 70-190°C, then acid is added to the slurry, the slurry is treated at 30-100°C and then a formed solid content is separated and recovered. An acid resistant siliceous filter assistant is produced by burning the obtained solid content at 200-1400°C as the case may be.
Inventors:
Shuji Tsunematsu
Application Number:
JP15300697A
Publication Date:
April 24, 2000
Filing Date:
May 26, 1997
Export Citation:
Assignee:
Director of Industrial Technology
Shuji Tsunematsu
Shuji Tsunematsu
International Classes:
B01D39/00; B01D39/06; B01J20/10; B01J20/30; (IPC1-7): B01J20/10; B01D39/00; B01D39/06; B01J20/30
Domestic Patent References:
| JP8245215A | ||||
| JP7206423A | ||||
| JP61227841A |
Attorney, Agent or Firm:
220100014 Kyushu Industrial Technology Research Institute Director, AIST