Compositions comprising mineral particles in suspension and meth

Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...

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1621646, 1621682, 1621683, 1621811, 1621814, 1621818, 210728, C02F 156

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047117273

ABSTRACT:
An aqueous slurry of mineral particles, for example calcium carbonate and/or calcium hydroxide, has a mineral solids concentration of at least 40% m/m and contains an agent that maintains the slurry at a pumpable viscosity but that acts as a flocculant upon dilution of the slurry. Suitable agents include cationic and amphoteric polyelectrolytes having nitrogen-containing groups, for example polyamines and dimethyl diallyl ammonium chloride polymers. The slurries may contain other components, for example a synthetic hectorite or a dispersing agent such as a polyacrylate, polymethacrylate or polyphosphate. The slurries are useful in papermaking and in the treatment of sewage.

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