Agent for eliminating heavy metals comprising a phosphate compound
AssigneeRhodia Chimie
InventorsYves Mottot, Jean-Claude Kiefer
Life of this patent
Estimating the term…
Abstract
The invention concerns an agent for eliminating heavy metals contained in an aqueous effluent comprising: an alkaline metal silicate, an alkaline metal carbonate; a phosphate compound, for example a sodium orthophosphate: and optionally a carrier, in particular a clay. Said agent may further contain a sulphur compound. Said agent can constitute an agent stabilizing said metals, and can be used for eliminating or stabilizing heavy metals, in particular cadmium, nickel and lead, contained in industrial aqueous effluents.
Claims19
A process for removing heavy metals contained in a medium, comprising the steps of adding to said medium an agent comprising:
- at least one compound (A) which is an alkali metal silicate,
- at least one compound (B) which is an alkali metal carbonate, and
- at least one compound (C) which is a phosphate, wherein said heavy metals are cadmium, chromium, copper, nickel, lead, zinc or iron, and wherein said medium is an aqueous effluent formed by aqueous liquors from purification of flue gases coming from waste incineration.
Dependencies are inferred from the claim text.