Essentially insoluble heavy metal sulfide slurry for...

Details Essentially insoluble heavy metal sulfide slurry for... Essentially insoluble heavy metal sulfide slurry for...

2006-02-21

2006-02-21

Langel, Wayne A. (Department: 1754)

Chemistry of inorganic compounds

Sulfur or compound thereof

Binary compound

C423S566100

Reexamination Certificate

active

07001583

ABSTRACT:
A product and method for the removal of pollutant heavy metals from aqueous solutions which precludes the end user from storing, handling, feeding and controlling hazardous soluble sulfide materials. The product is a slurry which includes a mixture of a liquid medium and an essentially insoluble salt wherein the salt is the reaction product of heavy metal ions, preferably selected from Mn++ions, Fe++ions, and Fe+++ions, and sulfide ions derived from soluble sulfide sources such as sodium sulfide, hydrogen sulfide, and sodium hydrosulfide. Addition of the subject slurry to a wastewater stream will effect the precipitation of heavy metals with lesser equilibrium sulfide ion concentrations than that of the essentially insoluble salt. Solids collected by this method may be returned to subsequent wastewater streams for additional removal of heavy metals by any excess heavy metal sulfide salt.

REFERENCES:
patent: 4250030 (1981-02-01), Kuit et al.
patent: 6896817 (2005-05-01), Bowers

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