Essentially insoluble heavy metal sulfide slurry for wastewater treatment

Abstract From the Canadian patent

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 …