Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1976-12-29
1977-09-20
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
210 37B, 210 38R, 210 30R, 210 32, C01G 3714
Patent
active
040497720
ABSTRACT:
A chromic acid solution can advantageously be recovered from the waste water by a process which comprises passing the waste water successively through an anion-exchange column system consisting of two or more serially interconnected anion-exchange resin columns each packed with an anion-exchange resin thereby deionizing the waste water, and, in the course of this deionization treatment, column backwashing the first anion-exchange resin when the anion-exchange capacity thereof has fallen to the point where the influent to and the effluent from the first anion-exchange resin column have become substantially equal in terms of chromate ion content. In the course of the regeneration treatment, the waste water is diverted to enter the anion-exchange column system through the second anion-exchange resin column. After the regeneration treatment has been completed, the first anion-exchange resin column is put back into service in the anion-exchange system so as to serve as the last stage. Thereafter the procedure described above is repeated with respect to the successive anion-exchange resin columns composing the system thereby permitting passage of the waste water to be carried out continuously. The eluate which results from the regeneration treatment is recovered as a reusable chromate solution.
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Sato Kazunori
Takada Shunsuke
Carter Herbert T.
Tokico Ltd.
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