C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
241/136
C01F 11/18 (2006.01) B03B 9/00 (2006.01) B03D 1/001 (2006.01) B03D 1/02 (2006.01) C09C 1/02 (2006.01)
Patent
CA 1310941
ABSTRACT NATURAL CALCIUM CARBONATE ORES There is disclosed a process for purifying a calcium carbonate-containing mineral which process comprises the following steps:- a) mixing the calcium carbonate-containing mineral with water and a dispersing agent to form a suspension containing from 60% to 80% by weight of the dry mineral; b) comminuting the suspension of calcium carbonate-containing mineral prepared in step a) to give a product containing not more than 5% by weight of particles which are retained on a sieve having a nominal aperture of 53 microns and not more than 50% by weight of particles which are smaller than 2 microns e.s.d.; c) subjecting the suspension containing from 60% to 80% by weight of the dry comminuted mineral prepared in step b) to froth flotation using a collector for disclouring impurities which colletor comprises a cation containing at least one long chain alkyl group having from 10 to 24 carbon atoms, to yield an underflow product containing the calcium carbonate- containing mineral from which substantially all discolouring impurities have been removed, and d) further comminuting the underflow product of step c) to give a material of which at least 40% by weight of the particles have an equivalent spherical diameter smaller than 2 microns.
566424
Ecc International Limited
Sim & Mcburney
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