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A sample of crude chalk from the Paris Basin, France was comminuted by crushing and ball milling until 20% by weight consisted of particles having an equivalent spherical diameter smaller than 2 microns.Hydrated Lime Manufacturing Process 380g of the comminuted chalk were mixed with sufficient tap water to form a suspension containing 30% by weight of dry chalk and the resultant suspension was ground with 2.5 Kg of a grinding medium which consisted of Leighton Buzzard sand consisting of particles with diameters ranging from 0.5 mm to 1.0 mm.


The duration of the grinding was such that 105 horsepower hours of energy per ton of dry chalk (278 KJKg- 1) were dissipated in the suspension. Sufficient calcium hydroxide was then mixed with the comminuted suspension to provide 0.3% by weight of calcium hydroxide based on the weight of dry chalk. The resultant suspension was then dewatered by filtration,coal mill in power plant the solids content of the cake was adjusted to 70% by weight and the cake was deflocculated with 0.3% by weight, based on the weight of dry chalk, of the sodium polyacrylate dispersing agent. The viscosity of the deflocculated suspension was 80 centipoise which can be seen to be very similar to the result shown in Table II for the same additions of calcium hydroxide and sodium polyacrylate, the calcium hydroxide being added before the grinding step.


Samples of the same chalk as was used in Example 5, after comminution by crushing and ball milling until 20% by weight consisted of particles having an equivalent spherical diameter smaller than 2 microns, were mixed with water to form suspensions containing 30% by weight of dry chalk. A different amount of calcium hydroxide was added to each suspension and each suspension was ground with the same grinding medium as in Example 5, 105 horsepower hours of energy per ton of dry chalk (278 KJKg- 1) being dissipated in each suspension. Each suspension was then dewatered by filtration and the solids content of the cake was adjusted to 70% by weight.

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