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Color Control of Portland Cement Clinker by Separate Input of Mineralizers
https://orcid.org/http://orcid.org/0000-0002-4153-7416
https://orcid.org/http://orcid.org/0000-0001-6452-9585
The color control of Portland cement clinker was regulated by separate insertion of calcium fluoride in the presence of Na2O. Studies were carried out on a raw mixture of pure reagents with a Fe2O3 content equal to 2.93%. The mixture has the following characteristics: KH = 0.93; AM = 1.24; SM = 2.18. Calcium fluoride was inserted as a CaF2 reagent of the “pure” qualification. Na2O was inserted as a “pure” Na2CO3 reagent. The samples were roasted in a laboratory furnace at 1300 °C with an isothermal exposure time of 20 min. The heating speed of the furnace is 10 °C/min. The color change was determined by measuring the brightness coefficient on a reference polished barium sulfate plate using an FB-2 gloss meter. The content of free calcium oxide was determined by the ethyl-glycerate method. It was found that the optimal approach for increasing the clinker whiteness is to insert 1.5% CaF2 separately in the presence of 3.5% Na2O. The amount of 3.5% Na2O is sufficient to bind stoichiometric all aluminum in Na2O∙Al2O3. The binding of Al2O3 to sodium aluminate prevents the formation of calcium aluminoferrites. At the same time, the whiteness of the compound with a mineralizer is 49.5%. In the compound without a mineralizer, it reaches 39%. An increase in the clinker whiteness to the maximum is accompanied by a decrease in the content of free calcium oxide. In the compound without a mineralizer, it is 20.1%. The compound with a mineralizer has a free calcium oxide content of 5.28%.
Color Control of Portland Cement Clinker by Separate Input of Mineralizers
https://orcid.org/http://orcid.org/0000-0002-4153-7416
https://orcid.org/http://orcid.org/0000-0001-6452-9585
The color control of Portland cement clinker was regulated by separate insertion of calcium fluoride in the presence of Na2O. Studies were carried out on a raw mixture of pure reagents with a Fe2O3 content equal to 2.93%. The mixture has the following characteristics: KH = 0.93; AM = 1.24; SM = 2.18. Calcium fluoride was inserted as a CaF2 reagent of the “pure” qualification. Na2O was inserted as a “pure” Na2CO3 reagent. The samples were roasted in a laboratory furnace at 1300 °C with an isothermal exposure time of 20 min. The heating speed of the furnace is 10 °C/min. The color change was determined by measuring the brightness coefficient on a reference polished barium sulfate plate using an FB-2 gloss meter. The content of free calcium oxide was determined by the ethyl-glycerate method. It was found that the optimal approach for increasing the clinker whiteness is to insert 1.5% CaF2 separately in the presence of 3.5% Na2O. The amount of 3.5% Na2O is sufficient to bind stoichiometric all aluminum in Na2O∙Al2O3. The binding of Al2O3 to sodium aluminate prevents the formation of calcium aluminoferrites. At the same time, the whiteness of the compound with a mineralizer is 49.5%. In the compound without a mineralizer, it reaches 39%. An increase in the clinker whiteness to the maximum is accompanied by a decrease in the content of free calcium oxide. In the compound without a mineralizer, it is 20.1%. The compound with a mineralizer has a free calcium oxide content of 5.28%.
Color Control of Portland Cement Clinker by Separate Input of Mineralizers
https://orcid.org/http://orcid.org/0000-0002-4153-7416
https://orcid.org/http://orcid.org/0000-0001-6452-9585
The color control of Portland cement clinker was regulated by separate insertion of calcium fluoride in the presence of Na2O. Studies were carried out on a raw mixture of pure reagents with a Fe2O3 content equal to 2.93%. The mixture has the following characteristics: KH = 0.93; AM = 1.24; SM = 2.18. Calcium fluoride was inserted as a CaF2 reagent of the “pure” qualification. Na2O was inserted as a “pure” Na2CO3 reagent. The samples were roasted in a laboratory furnace at 1300 °C with an isothermal exposure time of 20 min. The heating speed of the furnace is 10 °C/min. The color change was determined by measuring the brightness coefficient on a reference polished barium sulfate plate using an FB-2 gloss meter. The content of free calcium oxide was determined by the ethyl-glycerate method. It was found that the optimal approach for increasing the clinker whiteness is to insert 1.5% CaF2 separately in the presence of 3.5% Na2O. The amount of 3.5% Na2O is sufficient to bind stoichiometric all aluminum in Na2O∙Al2O3. The binding of Al2O3 to sodium aluminate prevents the formation of calcium aluminoferrites. At the same time, the whiteness of the compound with a mineralizer is 49.5%. In the compound without a mineralizer, it reaches 39%. An increase in the clinker whiteness to the maximum is accompanied by a decrease in the content of free calcium oxide. In the compound without a mineralizer, it is 20.1%. The compound with a mineralizer has a free calcium oxide content of 5.28%.
Color Control of Portland Cement Clinker by Separate Input of Mineralizers
Lecture Notes in Civil Engineering
Klyuev, Sergey Vasil'yevich (editor) / Klyuev, Alexander Vasil'yevich (editor) / Kovalev, S. V. (author) / Mishin, D. A. (author)
International Conference Industrial and Civil Construction ; 2021 ; Belgorod, Russia
Proceedings of the International Conference Industrial and Civil Construction 2021 ; Chapter: 4 ; 23-27
2021-02-12
5 pages
Article/Chapter (Book)
Electronic Resource
English
METHOD FOR INTENSIFICATION OF BURNING PROCESS OF PORTLAND CEMENT CLINKER BY MINERALIZERS (VERSIONS)
| European Patent Office | 2017