Nalco Chemical Company

David A Picco

Kristine S Salmen

Pek L Choo

Michio Kobayashi

Bruce A Keiser

Michael L Braden

Maureen B Nunn

Ronald D Kochik

A method for the manufacture of paper comprising the steps of:

Colloidal silica/polyelectrolyte blends for pulp and paper applications

This invention relates to the clarification of natural waters containing turbidity-causing components. This method comprises the addition of a stable colloidal silica suspension and water based polymeric coagulant to the turbid water. The components of the invention may be added independently, or blended together so that addition is simultaneous. The colloidal silica may also be conditioned by passing over a cationic exchange resin prior to addition of cationic polymer.

Colloidal silica/polyelectrolyte blends for natural water clarification

This invention relates to a composition of matter of a silica sol/water soluble cationic polymer mixture. The colloidal silica may also be conditioned by passing over a cationic exchange resin prior to addition of cationic polymer.

The invention comprises a method of preventing deposition of oil on steel mill scale particles comprising adding from about 1 part per million to about 500 parts per million of an amine acrylate/acrylic acid copolymer to mill flume water. Once the copolymer is added, deposition of oil onto scale particles is prevented. The recovered mill scale has less than 2% oil by weight on the scale, making it suitable for recycle to the steelmaking process. Oil and water are subsequently separated with a greater percentage of oil being recovered.

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Shorewood, IL, United States of America

David A Picco