Patent ID: 7001583

Claim:
A heavy metal sulfide slurry for use in a wastewater treatment process comprising a mixture consisting essentially of a liquid medium and an essentially insoluble salt comprising the reaction product of heavy metal ions and sulfide ions, the essentially insoluble salt having a particle size distribution wherein at least about 50 percent of the particles have a size of less than 1 micron, and the essentially insoluble salt comprising greater than 2 percent by weight of the slurry, wherein upon addition to a wastewater stream containing at least one heavy metal pollutant selected from the group consisting of Zn ++ , Ni ++ , Sn ++ , Co ++ , Pb ++ , Cd ++ , Ag + , Bi ++ , Cu ++ , and Hg ++ , the slurry reacts with and precipitates the heavy metal pollutant.