Cytec Technology Corporation

American Cyanamid Company

Peter V Avotins

Alan S Rothenberg

Robert E Evans

Frank Kula

Robert Cole

Samuel S Wang

Roderick Glyn Ryles

Donald Paul Spitzer

Danny Lee

Colin McRae

Gregory Flieg

Richard D Nichols

Dennis G Downing

A Grady Williams

Processes for improving solids/liquids separation efficiency in the Bayer process are disclosed, wherein Bayer process streams are treated with calcium or magnesium salts, flocculated with carboxylic acid or salt group-containing polymers, and centrifuged.

Concentration of solids by flocculating in the Bayer process

Methods of reducing foam in Bayer process liquor are provided, said methods comprising adding a composition to the Bayer process liquor that comprises a tri(alkoxy alkyl) phosphate and a hydroxyl group containing carrier.

Compositions and method for foam control in Bayer process

The processing of bauxite in the Bayer Process results in the formation of titanaceous, siliceous, and other scale on equipment and apparatus such that a great deal of time and effort is spent in order to maintain the process at its height efficiency by reducing or eliminating the same. The scale is treated, reduced, altered, etc., according to the present invention by the use of hydroxamated polymers having weight average molecular weights of over about 10,000.

Use of hydroxamated polymers to alter Bayer Process scale

The processing of bauxite in the Bayer Process results in the formation of titanaceous, siliceous, and other scale on equipment and apparatus such that a great deal of time and effort is spent in order to maintain the process at its height efficiency by reducing or eliminating the same. The scale is treated, reduced, altered, etc., according to the present invention by the use of hydroxamated polymers having weight average molecular weights ranging from about 1,000 to less than about 10,000.

Use of hydroxamated polymers to alter bayer process scale

New and improved processes and compositions for use in flotation recovery of metal values from base metal zinc sulfide ores are disclosed. The collector compositions for froth flotation of metal sulfide minerals comprise the combination of combination of 1) at least one allylalkylthionocarbamate compound having the formula ##STR1## wherein R is a C.sub.2 to C.sub.8 alkyl radical, preferably R is an isobutyl group, and 2) a xanthate having the formula ##STR2## wherein R' is a C.sub.2 to C.sub.8 alkyl radical, preferably a C.sub.4 radical. More preferably, the C.sub.4 radical of the xanthate is a butyl or isopropyl group. Preferably, the concentration of allylalkylthionocarbamate to xanthate of a ratio of from about 1:99 to about 50:50 percent by weight.

Collector composition for flotation of activated sphalerite

Process for producing agglomerates, e.g., by pelletizing a particulate inorganic material for example an ore material, characterized by the addition to the agglomerated material of an organic fibrous material, especially a polyacrylonitrile fiber material, to bind and thereby enhance the properties of the agglomerates and recovery of metal values therefrom.

Fiber bonded agglomerated ore materials

Process for producing agglomerates, e.g., by pelletizing a particulate inorganic material, for example, an ore material, characterized by the addition to the agglomerated material of an organic fibrous material, especially a polyacrylonitrile fiber material, to bind and thereby enhance the properties of the agglomerates and recovery of metal values therefrom.

Process for producing fiber bonded agglomerated ore materials

Improved filtration rates and decreased sodium chloride and moisture content in sodium bicarbonate filter cakes are obtained by including a filter aid containing a mono and/or dialkylester of sodium sulfosuccinate in the filter feed suspension.

Surfactants in dewatering sodium bicarbonate

A process for the recovery of mineral values from carbonaceous ores is disclosed wherein the collector comprises a hydrocarbon acid or acidester having a molecular weight of at least about 500, an oil, and optionally, a sulfonated hydrocarbon compound.

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Easton, CT, United States of America

Peter V Avotins