Amine-containing cement processing additives
View Patent ↗An exemplary method of the invention comprises introducing into a grinding mill, wherein cement clinker is ground to provide cement powder, a diamine such as tetrahydroxylethylethylene diamine, and an alkanolamine such as triethanolamine or triisopropanolamine. The combination of the diamine and alkanolamine provides superior grinding efficiency compared to diamine or alkanolamine added separately.
1. 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.
2. The method of claim 1 wherein the dosage of said tetrahydroxylethylethylene diamine or derivative thereof and said alkanolamine in terms of their weight solids based on weight solids of cement is 0.01% to 0.1%.
3. The method of claim 1 comprising incorporating, into said cement clinker being around in said grinding mill, tetrahydroxylethylethylene diamine or derivative thereof in the amount of 28–38%, triethanolamine in the amount of 9–19%, and diethanolisopropanolamine in the amount of 53–63%, said percentages based on the total weight of said tetrahydroxylethyleethylene diamine or derivative thereof, said triethanolamine, and said diethanolisopropanolamine being incorporated into said grinding mill.
4. The method of claim 1 wherein said tetrahydroxylethylethylene diamine or derivative thereof and said alkanolamine being ground with the cement clinker are operative to said enhance Blame fineness of cement produced from the grinding of said cement clinker when compared to grinding the cement clinker using said tetrahydroxylethylethylene diamine or derivative thereof or said alkanolamine separately.
5. The method of claim 1 wherein said grinding of said cement clinker occurs in a closed-circuit grinding mill wherein coarse ground material is returned into said mill for further grinding, said tetrahydroxylethylethylene diamine or derivative thereof and said alkanolamine are operative to decrease the amount of coarse material returned to the mill for further grinding.
6. The method of claim 1 wherein said tetrahydroxylethylethylene diamine or derivative thereof and said alkanolamine being ground with the cement clinker are operative to enhance the strength of the cement.
7. A cement powder composition provided by the method of claim 1 .
8. The composition of claim 7 wherein said tetrahydroxylethylethylene diamine or derivative thereof is present in the amount of 20–30% and said alkanolanolamine is diethanolisopropanolamine which is present in the amount of 80–70%, said percentages based on total weight of said composition.
9. The composition of claim 8 further comprising triethanolamine.