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Title:
ADMIXTURE FOR FIXING HEXAVALENT CHROMIUM AND METHOD FOR CONTROLLING ELUTION OF HEXAVALENT CHROMIUM
Document Type and Number:
Japanese Patent JP3599711
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To provide an admixture for controlling elution of hexavalent chromium in soil and sludge contaminated with heavy metals, used in combination with a cement solidification agent, and a method for controlling elution thereof.
SOLUTION: The admixture for fixing hexavalent chromium, produced by mixing sodium silicate with liquid containing a chloride and ferrous sulfate as main components, is mixed with treated soil and sludge containing hexavalent chromium in combination with the cement solidification agent so as to fix hexavalent chromium and to control elution thereof. In solidifying contaminated soil and sludge of which the elution of various heavy metals is not controlled so as to meet the environmental standards by a conventional cement solidification agent, the method remarkably reduces the elution of heavy metals or the like without damaging exertion of strength of cement and controls the elution thereof to meet the environmental standards.


Inventors:
Shozo Okawa
Zhou Kokuhei
Application Number:
JP2002036794A
Publication Date:
December 08, 2004
Filing Date:
February 14, 2002
Export Citation:
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Assignee:
Shozo Okawa
International Classes:
B09C1/02; B09C1/08; C02F11/00; C09K17/02; C09K17/08; C09K17/10; C09K17/12; B09B3/00; C09K103/00; (IPC1-7): B09C1/02; B09B3/00; B09C1/08; C02F11/00; C09K17/02; C09K17/08; C09K17/10; C09K17/12
Domestic Patent References:
JP9294967A
JP53015264A
JP55162381A
JP9294917A
Attorney, Agent or Firm:
Masaki Goto
Yoshio Matsuda