Abstract
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%.
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The study is implemented in the framework of the Flagship University Development Program at Belgorod State Technological University named after V.G. Shukhov, using the equipment of High Technology Center at BSTU named after V.G. Shukhov.
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Kovalev, S.V., Mishin, D.A. (2021). Color Control of Portland Cement Clinker by Separate Input of Mineralizers. In: Klyuev, S.V., Klyuev, A.V. (eds) Proceedings of the International Conference Industrial and Civil Construction 2021. ICICC 2021. Lecture Notes in Civil Engineering, vol 147. Springer, Cham. https://doi.org/10.1007/978-3-030-68984-1_4
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