Nalco Chemical Company

Other

David C Davis

Lawrence J Connelly

David O Owen

Steven J Abbatello

David A Undlin

In the Bayer process for producing alumina from bauxite of the type wherein the bauxite is added to a caustic solution to produce a soluble aluminate solution and an insoluble red mud fraction which is then subjected to one or more separation steps to produce a thickener overflow which is then subjected to a Kelly Filter Press to polish the thickener overflow the improvement which comprises treating the thickener overflow and the filter aid with a filtration improving amount of dextran.

Use of dextran as a filtration aid for thickener overflow filtration in

A flexible toy wand having a battery case at its lower end which also serves as the handle of the wand and a decorative lightable end piece at the tip of the wand. The wand is waved in a darkened area and various paths of light are created by the movement of the lighted end piece.

Flexible toy wand

A method and composition for producing a more coarse alumina trihydrate crystal in a Bayer process pregnant liquor, involving the addition of approximately 5-400 mg/l of surfactant-oil, the oil dissolving the surfactant which can be selected from a host of surfactants which are stable in (hot) caustic solutions and capable of dispersing hydrophobic liquids in the Bayer liquor. The preferred embodiment involves the use of tall-oil fatty acids; a number of equivalent surfactants are established. The oil or hydrocarbon (hydrophobic) liquid can be selected from paraffinic oils, naphthenic oils, mineral seal oils, fuel oils, and bottoms or residue from a C.sub.10 alcohol distillation.

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Chesterfield, MO, United States of America

David C Davis