Formulations and methods for removing heavy metals from waste solutions containing chelating agents
AssigneeThatcher Company
InventorsMark A. Ross, Jeffrey W. Zidek
Life of this patent
Estimating the term…
Abstract
Described are chemical formulations that remove heavy metals from waste solutions containing a chelating agent. Also disclosed are methods for removing heavy metals from waste solutions utilizing such chemical formulations.
Claims23
A chemical formulation for removing a heavy metal from a waste solution containing a chelating agent, the chemical formulation comprising, based on the total weight of the chemical formulation:
- from about 40% to about 45% of an alkaline sulfide solution and/or alkaline earth sulfide solution at about 45% solids;
- from about 0% to about 10% of an alkaline hydroxide solution and/or alkaline earth hydroxide solution at about 45% solids;
- from about 10% to about 20% of a sodium aluminate at about 40% solids;
- and
- water,
- wherein the chemical formulation has pH of between about 10 and about 13.5, and
- wherein the chemical formulation does not comprise either an oxidizing agent or a dithiocarbamate-based compound.
A chemical formulation for removing a heavy metal from a waste solution containing a chelating agent, the chemical formulation consisting essentially of, based upon the total weight of the chemical formulation:
- from about 40% to about 45% of an alkaline sulfide solution and/or alkaline earth sulfide solution at about 45% solids;
- from about 0% to about 10% of an alkaline hydroxide solution and/or alkaline earth hydroxide solution at about 45% solids;
- from about 10% to about 20% of a sodium aluminate at about 40% solids;
- and
- water,
- wherein the chemical formulation has pH of between about 10 and about 13.5.
Dependencies are inferred from the claim text.