Title:
PROCESS FOR NEUTRALIZING BAUXITE DISSOLUTION RESIDUAL SUBSTANCE AND PROCESS FOR PRODUCING ALUMINUM HYDROXIDE
Document Type and Number:
WIPO Patent Application WO/2009/082024
Kind Code:
A3
Abstract:
A process for neutralization is provided which can maintain a high solid content of a bauxite dissolution residual substance slurry even after a neutralization treatment is completed and the stabilize pH within a short time of the neutralization treatment. Such a process for neutralizing a bauxite dissolution residual substance containing a desiliconizing product which is generated in the production process of aluminum hydroxide using Bayer process, includes: mixing a bauxite dissolution residual substance or a bauxite dissolution residual substance slurry with sulfuric acid in an amount ranging from 0.6 to 1.2 equivalence to the total amount of sodium contained in the bauxite dissolution residual substance or a bauxite dissolution residual substance slurry, such that the solid content after mixing becomes 400 to 700 g/1 to gelate the mixture, and thereafter obtaining a bauxite dissolution residual substance neutralized slurry.
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Inventors:
ISHIKAWA ISAO (JP)
Application Number:
PCT/JP2008/073903
Publication Date:
July 15, 2010
Filing Date:
December 22, 2008
Export Citation:
Assignee:
SHOWA DENKO KK (JP)
ISHIKAWA ISAO (JP)
ISHIKAWA ISAO (JP)
International Classes:
B09B3/00; C01F7/066; C02F11/14
Domestic Patent References:
| WO2005047183A1 | 2005-05-26 |
Foreign References:
| EP0048417A1 | 1982-03-31 | |||
| JP3663647B2 | 2005-06-22 | |||
| GB1398831A | 1975-06-25 | |||
| FR2197822A1 | 1974-03-29 | |||
| DE1592104A1 | 1970-10-29 | |||
| US4119698A | 1978-10-10 | |||
| AU8976891A | 1992-06-25 | |||
| JPH02111627A | 1990-04-24 |
Attorney, Agent or Firm:
SHIGA, Masatake et al. (MarunouchiChiyoda-ku, Tokyo, JP)
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