Controlling the rheology of a metal ore residue
AssigneeCoatex
InventorsMehdi Bouzid, Christian Jacquemet, Benoit Magny, Jacques Mongoin
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Abstract
A method for preparing an aqueous mineral suspension from an aqueous metal ore residue may include introducing into the aqueous metal ore residue a polymer (P) having a molecular mass Mw measured by GPC ranging from 2,000 to 20,000 g/mol. The polymer (P) may be prepared by radical polymerization of at least one anionic monomer (M). The suspension produced by such a method may have a Brookfield viscosity of which is lower than 1,800 mPa·s or a yield point of lower than 80 Pa.
Claims20
A method for preparing an aqueous mineral suspension, the method comprising:
- combining, with an aqueous metal ore residue, a material comprising a polymer (P),
- wherein the polymer (P) has a molecular mass Mw, measured by GPC, in a range of from 2,000 to 20,000 g/mol,
- wherein the polymer (P) is prepared by a process comprising a radical polymerization, at a temperature greater than 50° C., of a monomer comprising an anionic monomer (M) comprising a polymerizable olefinic unsaturation and a carboxylic acid group, optionally in salt form, in the presence of a reagent comprising hydrogen peroxide, benzoyl peroxide, acetyl peroxide, laurel peroxide, tert-butyl hydroperoxide, cumene hydroperoxide, ammonium persulfate, an alkaline metal persulfate, and/or an azo compound, optionally as a combination or association comprising an FeII, FeIII, CuI, and/or CuII ion, as a radical-generator, and
- wherein the aqueous mineral suspension has a dry solid content greater than 40 wt. % of the aqueous mineral suspension, and
- wherein the aqueous mineral suspension has:
- (i) a Brookfield viscosity, measured at 100 rpm and at 25° C., of less than 1,800 mPa·s,
- and/or
- (ii) a flow threshold, measured at a temperature of 25° C. using a rheometer with imposed shearing, equipped with a bladed spindle, for a particular torsional loading, of less than 80 Pa.
An aqueous mineral suspension, comprising:
- an aqueous metal ore residue;
- and
- a polymer (P) with a molecular mass Mw, measured by GPC, in a range of from 2,000 to 20,000 g/mol,
- wherein the polymer (P) is prepared by a process comprising radically polymerizing, at a temperature greater than 50° C., a monomer comprising an anionic monomer (M) comprising a polymerizable olefinic unsaturation and a carboxylic acid group, optionally in salt form, in the presence of a reagent comprising hydrogen peroxide, benzoyl peroxide, acetyl peroxide, laurel peroxide, tert-butyl hydroperoxide, cumene hydroperoxide, ammonium persulphate, an alkaline metal persulphate, and/or an azo compound, optionally as combination or association comprising an FeII, FeIII, CuI, and/or CuII ion, as a radical generator,
- wherein the aqueous mineral suspension has a dry solids content greater than 50 wt. %, and has
- (i) a Brookfield viscosity, measured at 100 rpm and at 25° C., of less than 1,800 mPa·s,
- and/or
- (ii) a flow threshold measured at a temperature of 25° C. using a rheometer with imposed shearing, equipped with a bladed spindle, for a particular torsional loading, of less than 80 Pa.
Dependencies are inferred from the claim text.