Dulux Australia Ltd.

Ici Australia Operations Propreitary Limited

Willy Braun

A process of grinding ceramic materials such as zirconia comprises grinding in an agitated media-type mill in the presence of a dispersant, the process being characterized in that the grinding media has a particle size of from 0.8 3.0 mm, and in that the quantity of media present is such that the average stand-off distance between adjacent media particles is from 30-90 um. The preferred apparatus is an attrition mill with an additional holding tank which allows recycling. The ceramic powders thus produced are fine with an unusually narrow particle size distribution.

Grinding process

A process of recovering organic solvent from a liquid waste product which waste product is heat convertible by the steps of:

Solvent recovery process

Dewatering aqueous polymer slurries containing polyvinylalcohol stabilizer by forming an insoluble organic destabilizer in situ from a soluble parent compound comprising ionizable groups. The slurry may then be filtered at 50.degree. C. or higher to yield a soft cake of beads essentially free of stabilizer.

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East Brighton, Australia

Willy Braun