Grinding aid composition and cement product
AssigneeW. R. Grace & Co.-Conn.
InventorsJosephine H. Cheung, Ellis M. Gartner
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Abstract
A grinding aid composition suitable for grinding clinker into hydraulic cement powder, an improved grinding process and an improved cement product are disclosed. The grinding aid composition is composed of a mixture of at least one alkylene ether glycol and particulate carbon.
Claims18
A grinding aid composition for cement clinker grinding comprising a mixture of at least one alkylene glycol represented by the formula:
- HO(AO).sub.n H
- wherein A represents a C.sub.2 -C.sub.3 alkylene and n is an integer from 1 to 5 and particulate carbon in a weight ratio of alkylene glycol to carbon of 1:0.01 to 1:0.5.
A hydraulic cement composition comprising a mixture of hydraulic cement powder having uniformly distributed therein from 0.01 to 0.06% by weight of a mixture of alkylene glycol represented by the formula:
- HO(AO).sub.n H
- wherein A is selected from a C.sub.2 -C.sub.3 alkylene and n is an integer of 1 to 5 and particulate carbon;
- the glycol to carbon weight ratio being from 1:0.01 to 1:0.5.
A process to form hydraulic cement comprising treating cement clinker with from 0.01 to 0.06% by weight based on the clinker weight of a grinding aid composition composed of at least one alkylene glycol having the formula:
- HO(AO).sub.n H
- wherein A is ethylene or propylene and n is an integer of 1-5, and particulate carbon having a particle size of from 0.01 to 1 micron;
- said glycol to carbon weight ratio is from 1:0.01 to 1:0.5;
- subjecting the treated clinker to a grinding medium for a period sufficient to form a powder product;
- classifying the resultant powder product;
- and removing the desired cement powder.
Dependencies are inferred from the claim text.