Extraction and treatment of heavy metals

Details Extraction and treatment of heavy metals Extraction and treatment of heavy metals

2008-04-22

2008-04-22

Hruskoci, Peter A. (Department: 1797)

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

C071S012000, C134S010000, C134S025100, C210S712000, C210S718000, C210S721000, C210S724000, C210S726000, C210S912000, C210S916000, C405S128750

Reexamination Certificate

active

10542304

ABSTRACT:
Contaminated waste streams or soil or sludge is subjected to a first treatment stage with an acid liquor at a pH below 2 and at a solids content from 5 to 30%; then the liquid and solid phases from the first treatment stage are separated; the solids from the first treatment stage are mixed with a fresh acid liquor at a pH below 2 and a solids content from 5 to 30%; the liquid and solid phases from the second treatment stage are separated; the liquor separated from the first treatment stage is reacted with a base to precipitate the metals; the precipitated metals are separated and the liquor is recycled for reuse in the process; the solids separated from the second treatment stage are neutralized to adjust the pH to a level acceptable for a soil conditioner or fertilizer or other customized products; and the liquor from the second stage is used as the acidic liquor in the first treatment stage.

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Derwent Abstract Accession No. 96-275556/28, RU 2039726 C (AS Russia Sibe Sect Phys Tech Inst) Jul. 20, 1995.

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