C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/54
C02F 1/00 (2006.01) C02F 1/52 (2006.01)
Patent
CA 1078083
Abstract of the Disclosure It is known to treat waste waters containing heavy metal ions or compounds having a low solubility with a base to form a heavy metal sludge. Such sludges are not recycled and present an environmental hazard. The present invention overcomes the drawback in the prior art by providing a process for treating waste water which contains heavy metal ion or compounds having a low solubility, which comprises adding ferric ions to the waste water in an amount from 2 to 100 mols per mole of all heavy ion present in the waste water and adding an alkaline substance to said waste water in an amount from 0.9 to 2 equivalents per equivalent of acid radical present in said waste water and stirring the waste water without aeration at a temperature above 40°C whereby insoluble ferrite crystals incorporating the heavy metals are precipitated.
258577
Ohno Shigeru
Sakakibara Naotaka
Shimizu Shigeki
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