Ciba Specialty Chemicals Water Treatments Limited

Hal G Smith

Brian Dymond

Stephen John Adkins

Anne Frances Hooley

Michael Gerard Gallagher

A process in which material comprising an aqueous liquid with dispersed particulate solids is pumped as a fluid then allowed to stand and rigidify and the rigidification is improved whilst retaining the pump ability of the material by combining polymeric particles with the material during or prior to pumping the material, wherein the polymeric particles comprise water soluble polymer which has an intrinsic viscosity of at least 3 dl/g. The process of the invention more effectively minimises the area taken up by a stack of the material of given volume whilst maintaining the pumpability of the material. This invention is particularly suited to material that comprises red mud from the Bayer alumina process.

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South Jordan, UT, United States of America

Hal G Smith