C - Chemistry – Metallurgy – 06 – B
Patent
C - Chemistry, Metallurgy
06
B
52/16, 134/51
C06B 31/28 (2006.01) B02C 23/06 (2006.01) C01C 1/18 (2006.01) C05C 1/02 (2006.01) C06B 47/14 (2006.01)
Patent
CA 1125139
Abstract: Water soluble crystalline material which has been comminuted in a saturated aqueous solution of the material in the presence of a water-soluble crystal-growth inhibitor having a hydrophobic portion and a hydrophilic portion in its molecular structure is mixed with a deflocculant which inhibits the interaction of the hydrophobic molecular portions whenever the comminuted solid is suspended in water. The viscosity of aqueous suspensions of comminuted solid is thereby stabilised. The invention is especially beneficial in the preparation of aqueous suspensions of finely comminuted ammonium nitrate for use in slurry blasting explosives. With crystal-growth inhibitors such as water-soluble polysaccharide derivatives, long chain aliphatic amines, polyacrylic acids, sulphonated nuclear aromatic compounds, sulphonated dyes or sulphonated polymers the preferred deflocculant, which should be different from the crystal- growth inhibitor, may include water-soluble poly- saccharide derivatives, polyacrylic acid, polyvinyl pyrrolindone, sodium lignosulphonate and/or a salt of a condensate of naphthalene sulphonic acid with formaldehyde.
360167
Enever James A.
Paton Hugh S.
Ballantyne Donald G.
Imperial Chemical Industries Limited
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