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Title:
METHOD FOR SOIL IMPROVEMENT
Document Type and Number:
Japanese Patent JP3938949
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To obtain, from a phosphoric acid solution, a water glass grouting chemical which is reduced in corrosiveness and harmfulness and is inexpensive by removing chlorine and fluorine, which are harmful, from the acid solution.
SOLUTION: A phosphoric acid solution containing chlorine and fluorine is regulated so as to have a sulfuric acid concentration of 0.5-10wt.% and then subjected to steam stripping at 120-170°C to obtain a solution having contents of chlorine and fluorine of 5ppm or lower and 50ppm or lower, respectively. The solution is used as a water glass hardener in silicate grouting.


Inventors:
Yukihiro Yoda
Shoichi Araseki
Nobuo Kosuge
Tadashi Nagase
Application Number:
JP23037095A
Publication Date:
June 27, 2007
Filing Date:
September 07, 1995
Export Citation:
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Assignee:
Mitsui Chemicals, Inc.
International Classes:
E02D3/12; C04B28/34; C09K17/02; C09K17/12; C01B25/22; C01B25/234; C09K103/00; C09K107/00; (IPC1-7): C09K17/12; C04B28/34; C09K17/02; E02D3/12; //C09K103:00
Domestic Patent References:
JP51107612A
JP5265918A
JP5267111A
JP4356588A
JP5413497A
JP61122109A
JP3390248B2