Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1980-07-30
1982-07-06
Hruskoci, Peter A.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
75108, 210737, 210912, 210913, 423 55, 423 92, 423104, C02F 152
Patent
active
043382002
ABSTRACT:
The invention relates to a process for the removal of heavy metal ions, particularly chromium, lead and/or zinc ions, from aqueous liquids by precipitation wherein the aqueous liquid containing the heavy metal ions and an aqueous liquid containing a base which precipitates the heavy metal ions in the form of their hydroxide or basic salt are added simultaneously to an amount of water at a pH between 5 and 10 and a temperature between 60.degree. and 100.degree. C. and the pH and the temperature are maintained in the specified ranges during the precipitation.
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Culp et al. "Heavy Metal Removal" New Concepts In Water Purification, 1974, pp. 218-223.
Galvanotechnik, 64, No. 5, 1973, pp. 366-369.
Akzo N.V.
Hruskoci Peter A.
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