W. R. Grace Co.-Conn.

Gcp Applied Technologies Inc.

Other

Nippon Shokubai Co., Ltd.

Denise A Silva

Josephine H Cheung

Lawrence R Roberts

Jeffrey Thomas

Mark F Roberts

Nathan A Tregger

Elise Berodier

David F Myers

Riccardo Stoppa

Richard Sibbick

Dorota Kazmierczak

Joshua Detellis

Li Zhang

David J Myers

Lawrence L Kuo

Paul J Sandberg

Byong-Wa Chun

Jeffrey E Thomas

Durga V Subramanian

Wee Fuk Lai

Leslie J Buzzell

Ernie Rocha

John L Gallagher

Thais Araujo

Keith Marsay

Masahiro Sato

The present invention provides a method and system for manufacturing cement wherein ground particles of cement and calcium sulfate are subjected to infrared sensors, laser sensors, or both, so that emanated, irradiated, transmitted, and/or absorbed energy having wavelengths principally within the range of 700 nanometers to 1 millimeter can be monitored and compared to stored data previously obtained from ground cement and sulfate particles and preferably correlated with stored strength, calorimetric, or other data values, such that adjustments can be made to the mill processing conditions, such as the form or amounts of calcium sulfate (e.g., gypsum, plaster, anhydride), or cement additive levels. The strength and other properties of cement can be thus adjusted, and its quality can be more uniform.

Cement production

Disclosed are exemplary method and system for manufacturing cement in a vertical roller mill (VRM) using humidity sensor readings. This enables adjustment of operational variables such as material feed, water, grinding additives, air flow, temperature, and their combinations. Exemplary embodiments allow manufacturers to predict and to improve cement properties, such as strength and setting time, by monitoring and managing humidity of air in the VRM and/or its air flow system.

Moisture management in vertical roller mills

A method for grinding a solid in a vertical roller mill (VRM), comprising grinding at least one solid in the presence of a grinding stabilizing additive, wherein the grinding stabilizing additive comprises an alkanol amino acid compound or a disodium or dipotassium salt thereof having the structural formula (I): The definitions of variables R, R, and Rare provided herein.

Grinding stabilizing additive for vertical roller mills

The present invention discloses compositions and methods wherein polycarboxylate comb polymers are used as grinding additives. The comb polymers contain a carbon-containing backbone and pendant groups wherein oxyalkylene pendant groups contain one or more ether linkage groups for providing robustness to the polymer for resisting degradation during grinding and hence sustaining workability and strength of hydratable cementitious materials, such as cements, pozzolans, limestone, and other cementitious materials.

Robust polycarboxylate containing ether linkages for milling preparation of cementitious materials

Method for suppressing antagonistic hydration reactions in Portland fly ash cement involves the use of unponded fly ash that is pre-hydrated, preferably as an aqueous slurry wherein fly ash, preferably having an alkaline earth metal oxide of at least 10% by weight, is soaked, whereby the hydration reaction of the resultant mixed fly ash and cement is accelerated when these components are mixed together with water to hydrate the cement. Blended Portland cement/fly ash compositions of the invention will also have higher early strength as well as shorter set time compared to untreated blends.

Suppression of antagonistic hydration reactions in blended cements

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Los Alamitos, CA, United States of America

Denise A Silva