Method for removing dissolved heavy metals from waste oils, indu

Details Method for removing dissolved heavy metals from waste oils, indu Method for removing dissolved heavy metals from waste oils, indu

1988-05-06

1990-07-24

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

208179, 208251R, 210716, 210725, 210912, 210914, 423 1, 423 43, 423 92, C02F 152

Patent

active

049433776

ABSTRACT:
Precipitation (conversion) of dissolved heavy metals in waste effluents is achieved with the addition and mixing of a solution of sodium polythiocarbonate with a solution containing dissolved heavy metals. The solution of sodium polythiocarbonate has been pH buffered to a pH of 12.5 or less in the manufacturing process. Precipitation of the dissolved heavy metals with the buffered sodium polythiocarbonate is complete by the formation of a stable, unleachable [as defined in 40 CFR 190.01, Part 261 Appendix II (Code of Federal Regulations)], extremely insoluble metallic polythiocarbonate particle.

REFERENCES:
patent: 4329224 (1982-05-01), Kim
patent: 4405462 (1983-09-01), Kamperman
patent: 4612125 (1986-09-01), Elfline
patent: 4678584 (1987-07-01), Elfline

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