Calgon Corporation

Neo Solutions, Inc.

Monica A Yorke

Todd W Groff

Keith C Hovland

Charles R Sundberg

Michael P Lesar

Ruta O Rakutis

Jasbir S Gill

Bennett P Boffardi

Nancy S Sherwood

Zahid Amjad

John P Farkas

The present invention provides a process for dewatering a mineral slurry concentrate and increasing the production of the resulting filter cake consisting essentially of mixing an aqueous mineral slurry concentrate with an effective amount of a nonionic surfactant and an effective amount of a cationic polymer to form a nonionic surfactant and cationic polymer treated aqueous mineral slurry concentrate, and subjecting the treated aqueous mineral slurry concentrate to a liquid water removal process for dewatering the treated aqueous mineral slurry and for increasing the production of a resulting filter cake of the dewatered mineral slurry. An improved mineral slurry concentrate composition and an improved mineral concentrate filter cake is also disclosed.

Process for dewatering a mineral slurry concentrate and increasing the production of a filter cake

Disclosed in the present application is a composition that is useful for rust and/or corrosion removal that contains a reducing agent, a chelating agent, a surfactant, and a dispersant. Disclosed also are processes for using this composition in aqueous systems and metal surface treatment.

Rust and scale removal composition and process

Compositions containing a water soluble carboxylic/sulfonic/polyoxyalkylene terpolymer and a water soluble phosphonate effectively control calcium carbonate scaling in aqueous systems under severe pH, alkalinity, calcite saturation and/or temperature conditions.

Method for controlling calcium carbonate scaling in high pH aqueous

The instant invention is directed to a method of inhibiting the precipitation and deposition of alkaline earth metal scales in an aqueous system, comprising adding to said system an effective amount of (a) an anionic polyelectrolyte; and (b) an anionic surfactant, wherein said polyelectrolyte/surfactant ratio ranges from 1000:1 to 1:10, by weight.

Polyelectrolyte and surfactant compositions for controlling alkaline

The instant invention is directed to a composition useful for inhibiting precipitation of calcium oxalate in aqueous systems comprising: (a) a water soluble phosphate, phosphonate or phosphinate; and (b) a water soluble polyelectrolyte wherein the ratio of component (a) to component (b) ranges from 10:1 to 1:10. The instant invention is further directed to a method of inhibiting the precipitation and deposition of calcium oxalate scale in an aqueous system, comprising adding to said system an effective amount of the above described composition, wherein said aqueous system has a pH greater than or equal to 2.0.

Process for controlling calcium oxalate scale over a wide pH range

The instant invention is directed to a method for reducing the formation of silica deposits in an aqueous system comprising adding an effective amount, preferably at least 0.1 ppm, of a carboxylic functional polyampholyte or the salt thereof to said aqueous system.

Carboxylic functional polyampholytes as silica polymerization retardants

The instant invention is directed to a method of inhibiting and dispersing deposit formation on metal surfaces of an evaporator used for the processing of black liquor which comprises the step of treating black liquor, at any point prior to completion of said processing, with a deposit inhibiting concentration of low molecular weight cationic polymer selected from the group consisting of poly(diallyldimethylammonium chloride), polymethacrylamidopropyltrimethylammonium chloride, poly-2-methacryloxyethyltrimethylammonium methosulfate, and poly-2-methacryloxyethyltrimethylammonium chloride.

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Coraopolis, PA, United States of America

Monica A Yorke