Patent ID: 7160384

Claim:
A method for grinding cement, comprising: introducing into a grinding mill, wherein cement clinker is ground to produce cement, tetrahydroxylethylethylene diamine or derivative thereof and an alkanolamine selected from the group consisting of triethanolamine, triisopropanolamine, and diethanolisopropanolamine, the ratio of said tetrahydroxylethylethylene diamine or derivative thereof to said alkanolamine being 95:5 to 5:95 based on weight, and the dosage of said tetrahydroxylethylethylene diamine or derivative thereof and said alkanolamine to cement being no less than 0.001% and no greater than 0.5% based on weight solids of said tetrahydroxylethylethylene diamine or derivative thereof and said alkanolamine to weight solids of cement (s/s); and grinding said tetrahydroxylethylethylene diamine or derivative thereof and said alkanolamine with cement clinker to produce cement powder.