Process for improving grinding of cement clinker in mills employing rollers
AssigneeW.R. Grace & Co.-Conn.
InventorJosephine H. Cheung
Life of this patent
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Abstract
An exemplary process for grinding cement clinker using rollers comprises introducing cement clinker into grinding contact with rollers operative to grind the clinker into particles; and introducing to the clinker and/or rollers, in an amount of 0.001-0.5 percent based on the dry weight of clinker, a binding-densifying agent comprising at least one polymer having an average molecular weight of 50,000-500,000. The clinker may be ground alone or in combination with other agrillaceous or pozzolanic materials.
Claims21
A process for improving grinding operations in which cement clinker is ground into cement particulates using rollers, said process comprising:
- introducing a cement clinker into grinding contact with rollers operative to grind the clinker into cement particles;
- and introducing to said clinker or said rollers an amount of 0.001-0.5 percent based on the dry weight of the cement clinker being introduced to said rollers, a binding-densifying agent comprising at least one polymer having an average molecular weight of 50,000-500,000.
A process for improving grinding operations in which cement clinker is ground into cement particulates using rollers, said process comprising:
- introducing a cement clinker into grinding contact with rollers operative to grind the clinker into cement particles;
- and introducing to said clinker or said rollers an amount of 0.001-0.5 percent based on the dry weight of the cement clinker being introduced to said rollers, a binding-densifying agent comprising at least one polymer having an average molecular weight of 50,000-500,000, said at least one polymer of said binding-densifying agent comprising a polyacrylic acid or salt thereof, a polyvinyl alcohol, a polyvinyl acetate, a polyvinyl chloride, a polyoxyethylene, a polysulfonic acid or salt thereof, a polyamide, or mixture thereof;
- and further introducing, into grinding contact with said rollers along with said cement clinker, a further agrillaceous material comprising a clay or a pozzolanic material selected from the group consisting of a natural pozzolan, flyash, limestone, blast furnace slag or mixture thereof;
- said cement clinker being used in an amount which exceeds 40 percent by weight of the total of materials comprising said clinker and said agrillaceous or pozzolanic material.
Dependencies are inferred from the claim text.