Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1993-04-02
1994-05-03
McCarthy, Neil M.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210719, 210720, 210724, 210912, 210913, 204149, 423 42, 423 43, 423 55, 423104, 423140, 4231503, C02F 162, C02F 164
Patent
active
053085019
ABSTRACT:
There is disclosed a method of treating a solution, e.g., an alkaline or acidic solution, containing heavy metals ions therein. With respect to alkaline solutions, the method includes providing a body of the solution; contacting the body with a material such as carbon dioxide to change the pH, e.g., to lower the pH to a pH in the range of 9 to 10.5; then treating the solution to further change the pH and cause precipitation of hydroxides, including chromium hydroxide; and separating the hydroxide precipitates from the solution to provide a substantially neutral solution having a reduced amount of chromium ions, for example, contained therein.
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Alexander Andrew
McCarthy Neil M.
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