Fixing agent of heavy metal

Abstract From the Canadian patent

This invention relates to fixing agents for heavy metals and heavy metal compounds and in particular to fixing agents which react with heavy metal ions or heavy metal compound precipitates of heavy metal ions and heavy metal compounds, and render heavy metal compounds insoluble. According to the invention aliphatic dithiocarbamate compound means a compound having an aliphatic chain which may contain a nitrogen atom in place of a carbon atom and at least two dithiocarbamate groups (>N-?-S-) and which is contained in the compound in the form of acid (R-NHCSSH or ), or salt or esters of alkali metals, alkaline earth metals and ammonium hydroxide of the dithiocarbamic acid group.