American Cyanamid Company

Cytec Technology Corporation

Samuel S Wang

Eugene L Smith, Jr

D R Nagaraj

Morris E Lewellyn

Ernie F Huliganga

Lino Giovanni Magliocco

Yun-Lung Fu

Michael J Scanlon

Alan S Rothenberg

Donald Paul Spitzer

David W Lipp

James S Lee

Charles Dugan

D R Nagarai

Devarayasamudram Ramachandran Nagaraj

Peter V Avotins

Peter J Strydom

Bill A Hancock

Jesus W Perez

D R Nagari

Dennis G Downing

Novel depressants for depressing sulfide minerals during froth floatation of ores to recover value minerals are disclosed, as well as a method for their use in the froth flotation. The novel depressants are terpolymers of a (meth)acrylamide, an allyl thiourea and a hydroxyalkyl(meth)acrylate.

Polymeric sulfide mineral depressants

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

Novel depressants for depressing sulfide minerals during froth floatation of ores to recover value minerals are disclosed, as well as a method for their use in the froth flotation. The novel depressants are terpolymers of a (meth)acrylamide, an allyl thiourea and a hydroxyalkyl (meth)acrylate.

A method for the depression of non-sulfide, silicate gangue minerals is provided wherein the depressant is a polymeric mixture of a polysaccharide and a material comprising recurring units of the formula: ##STR1## wherein X is the polymerization residue of an acrylamide or mixture of acrylamides, Y is an hydroxy group containing polymer unit, Z is an anionic group containing polymer unit, x represents a residual mole fraction of at least about 35%, y represents a residual mole fraction of from about 1 to 50% and z represents a residual mole fraction of from about 0 to about 50%.

Method of depressing non-sulfide silicate gangue minerals

A method for the depression of non-sulfide, silicate gangue minerals is provided wherein the depressant is a polymeric material comprising recurring units of the formula: ##STR1## wherein X is the polymerization residue of an acrylamide or mixture of acrylamides, Y is an hydroxy group containing polymer unit, Z is an anionic group containing polymer unit, x represents a residual mole fraction of at least about 35%, y represents a residual mole fraction of from about 1 to 50% and z represents a residual mole fraction of from about 0 to about 50%.

A method for the depression of non-sulfide, silicate gangue minerals is provided wherein the depressant is a mixture of a polysaccharide and a graft polymer of polyvinyl alcohol and an acrylamide.

A method for the depression of non-sulfide, silicate gangue minerals is provided wherein the depressant is a graft polymer of polyvinyl alcohol and an acrylamide.

Alkoxylated alkyl amines and alkoxylated alkyl guanidines are excellent collectors when used in mineral froth flotation to remove quartz, micaceous minerals, chlorite, pyrite and other mineral impurities from finely ground calcium carbonate to control tint, color, and abrasiveness.

Flotation process for purifying calcite

A method for the production of alkyl or alkaryl hydroxamic acids and/or salts wherein a C.sub.8 -C.sub.22 alcohol is employed with water as the solvent is disclosed as well as the resultant salt and/or acid solutions per se and their use in the flotation of non-sulfide minerals, preferably clay.

Collectors and processes for making and using same

Alkoxy and aryloxy isothiocyanates are produced by the reaction of a haloformate and an alkali or alkaline earth metal thiocyanate in the presence of water and (i) a catalyst comprising a six membered mononuclear or ten membered fused polynuclear aromatic, heterocyclic compound having 1 or 2 nitrogen atoms as the only hetero atoms in the ring and (ii) a co-catalyst comprising an alkali metal or alkaline earth metal salt of an acid having a pKa of about 10.sup.-3 or below. The co-catalyst accelerates the reaction rate, increases product purity and reduces the adverse effects of impurities in certain grades of the thiocyanate reactants.

Process of alkoxy and aryloxy isothiocyanate preparation

Various acrylic acid allyl/thiourea polymers and their use as depressants in the beneficiation of sulfide minerals from ores are disclosed.

Frothing procedure using polymeric sulfide mineral depressants

Allyl thiourea polymer with surface-modifying agent

Novel collectors and processes for making and using same

Allyl thiourea polymers

A novel polymer composition comprising recurring units of the formula: ##STR1## wherein each R.sup.1 is, individually, hydrogen or C.sub.1 -C.sub.4 alkyl; each R.sup.5, individually, is hydrogen or a C.sub.1 -C.sub.4 lower alkyl group; X is OH or SH; Y is OR.sup.2, SR.sup.2, NR.sub.2.sup.2, or NR.sup.2 -NR.sub.2.sup.2 ; R.sup.2 is hydrogen, a C.sub.1 -C.sub.4 lower alkyl or a C.sub.1 -C.sub.4 substituted lower alkyl, no more than one of Y and X being hydroxyl, and M is hydrogen, an alkali metal cation or an ammonium ion; x represents a residual mole percent fraction; y is a mole percent fraction ranging from about 0.5% to about 25%; z is a mole percent fraction ranging from about 0% to about 25%; and the molecular weight of the polymer is between about 1,000 and 500,000.

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Cheshire, CT, United States of America

Samuel S Wang