COMPOSITION FOR TREATING AN INORGANIC SLURRY

Abstract

A composition for treating an inorganic slurry, the composition including: (a) a tetrakis(hydroxyorgano)phosphonium salt; and (b) a dispersant selected from the group consisting of (i) a phosphonated compound containing at least one tertiary nitrogen atom, the phosphonated compound being a tetra sodium salt of nitrilo-tris(methylene phosphonate); and (ii) a homopolymer of an unsaturated acid, the homopolymer being a homopolymer of acrylic acid having a molecular weight in the range of 2,000 to 5,000.

Claims

1. A composition for treating an inorganic slurry, the composition comprising: (a) a tetrakis(hydroxyorgano)phosphonium salt; and (b) a dispersant selected from the group consisting of (i) a phosphonated compound containing at least one tertiary nitrogen atom, said phosphonated compound being a tetra sodium salt of nitrilo-tris(methylene phosphonate); and (ii) a homopolymer of an unsaturated acid, said homopolymer being a homopolymer of acrylic acid having a molecular weight in the range of 2,000 to 5,000.

2. The composition according to claim 1, in which the tetrakis(hydroxyorgano)phosphonium salt is tetrakis (hydroxymethyl)phosphonium sulphate.

3. The composition according to claim 1, in which the tetrakis(hydroxyorgano)phosphonium salt is selected from the group consisting of tetrakis(hydroxymethyl)phosphonium chloride, tetrakis(hydroxymethyl)phosphonium phosphate, tetrakis (hydroxymethyl)phosphonium nitrate and tetrakis(hydroxymethyl) phosphonium oxalate.

4. The composition according to claim 1, in which the dispersant is (b(i)).

5. The composition according to claim 1, in which the dispersant is (b(ii)).

6. The composition according to claim 1, in which a ratio of the tetrakis(hydroxyorgano)phosphonium salt to the dispersant, as active ingredients, in the composition is about 2:1.

7. A composition for treating an inorganic slurry, the composition comprising: (a) a tetrakis(hydroxyorgano)phosphonium salt selected from the group consisting of tetrakis(hydroxymethyl)phosphonium sulphate, tetrakis(hydroxymethyl)phosphonium chloride, tetrakis (hydroxymethyl)phosphonium phosphate, tetrakis(hydroxymethyl) phosphonium nitrate and tetrakis(hydroxymethyl)phosphonium oxalate; and (b) a dispersant which is the tetra sodium salt of nitrilo-tris(methylene phosphonate).

8. The composition according to claim 7, in which the tetrakis(hydroxyorgano)phosphonium salt is tetrakis (hydroxymethyl)phosphonium sulphate.

9. The composition according to claim 7, in which the tetrakis(hydroxyorgano)phosphonium salt is selected from the group consisting of tetrakis(hydroxymethyl)phosphonium chloride, tetrakis(hydroxymethyl)phosphonium phosphate, tetrakis (hydroxymethyl)phosphonium nitrate and tetrakis(hydroxymethyl) phosphonium oxalate.

10. The composition according to claim 7, in which a ratio of the tetrakis(hydroxyorgano)phosphonium salt to the dispersant, as active ingredients, in the composition is about 2:1.

11. A composition for treating an inorganic slurry, the composition comprising: (a) a tetrakis(hydroxyorgano)phosphonium salt selected from the group consisting of tetrakis(hydroxymethyl)phosphonium sulphate, tetrakis(hydroxymethyl)phosphonium chloride, tetrakis (hydroxymethyl)phosphonium phosphate, tetrakis(hydroxymethyl) phosphonium nitrate and tetrakis(hydroxymethyl)phosphonium oxalate; and (b) a dispersant which is a homopolymer of acrylic acid, the homopolymer having a molecular weight in the range of 2,000 to 5,000.

12. The composition according to claim 11, in which the tetrakis(hydroxyorgano)phosphonium salt is tetrakis (hydroxymethyl)phosphonium sulphate.

13. The composition according to claim 11, in which the tetrakis(hydroxyorgano)phosphonium salt is selected from the group consisting of tetrakis(hydroxymethyl)phosphonium chloride, tetrakis(hydroxymethyl)phosphonium phosphate, tetrakis (hydroxymethyl)phosphonium nitrate and tetrakis(hydroxymethyl) phosphonium oxalate.

14. The composition according to claim 11, in which a ratio of the tetrakis(hydroxyorgano)phosphonium salt to the dispersant, as active ingredients, in the composition is about 2:1.

15. A composition for treating an inorganic slurry, the composition comprising: (a) a tetrakis(hydroxyorgano)phosphonium salt, wherein the tetrakis(hydroxyorgano)phosphonium salt is tetrakis (hydroxymethylphosphonium sulphate; and (b) a dispersant selected from the group consisting of: (i) a phosphonated compound containing at least one tertiary nitrogen atom, said compound being a tetra sodium salt of nitrilo-tris(methylene phosphonate); and (ii) a homopolymer of an unsaturated acid, said homopolymer being a homopolymer of acrylic acid having a molecular weight in the range of 2,000 to 5,000 in which a ratio of the tetrakis(hydroxyorgano)phosphonium salt to the dispersant, as active ingredients, in the composition is about 2:1.

Description

EXAMPLE 1

[0030] THP.sup.+ salt alone.

EXAMPLE 2

[0031] THP.sup.+ salt and dispersant of type (b)(i).

EXAMPLE 3

[0032] THP.sup.+ salt and dispersant of type (b)(ii).

[0033] The amounts of each additive used, and the results, are given in the TABLE below.

TABLE-US-00001 TABLE Example THP.sup.+ salt Dispersant No. (ppm) (ppm) Result 1 (a) THPS (b) (nil) Instant heterogeneous 750 ppm thickening 2 (a) THPS b (i) No thickening. 750 ppm 375 ppm 3 (a) THPS b (ii) No thickening 750 ppm 375 ppm Notes to TABLE (a) An aqueous solution of tetrakis(hydroxymethyl)phosphonium sulphate (75% a.i.), available as TOLCIDE-PS75. (b) (i) An aqueous solution of the tetra sodium salt of nitrilo-tris(methylene phosphonic acid), available as BRIQUEST 301-32S. (b) (ii) A homopolymer of polyacrylic acid, having a molecular weight in the range 2000-5000 and available as BEVALOID 211.