Affiliation:
1. Institute of Metallurgy
Abstract
Influence of the chemical composition of CaO – SiO2 – B2O3 oxide system containing 15 % Al2O3 and 8 % MgO (in this expression and hereinafter indicated by mass %) on viscosity and crystallization temperature was studied using experiment method of simplex lattice planning. Addition of B2O3 to the slags of oxide system expands the range of slags composition with a low crystallization temperature and viscosity. Slags with a basicity of 2 – 3, containing 1 – 3 % of B2O3 are characterized by a low crystallization temperature, varying from 1400 to 1450 °С and have high flowability. The viscosity of such slags when heated to 1550 and 1600 °C does not exceed 0.20 and 0.15 Pa·s, respectively. An increase in B2O3 content to 4 – 6 % in slags with a basicity of 2 – 3 is accompanied by a decrease in crystallization temperature to 1350 – 1425 °C with keeping low, not more than 0.15 Pa·s, viscosity in the range of heating temperatures at 1550 and 1600 °C. The displacement of formed slags containing 1 – 6 % of B2O3 to the area of increased basicity up to 3 – 5 preserves their relatively high fluidity. In this case, with an increase in B2O3 concentration, there is a clear tendency for the studied oxide system to shift to the region of low crystallization temperatures. Crystallization temperature of slags with basicity of 3 – 4 containing 6 % of B2O3 reaches 1400 °С and practically does not exceed 1475 °С of slags with basicity of 4 – 5 containing 1 – 2 % of B2O3 . At temperature of 1600 °C, the viscosity of such slags varies from 0.15 Pa·s with a basicity of 3 and a content of 5 – 6 % of B2O3 to 0.25 Pa·s in the basicity range of 4 – 5 with B2O3 content of 1 – 3 %. A decrease in temperature of the studied oxide system by 50 °C is accompanied by a slight (no more than 0.05 Pa·s) increase in viscosity.
Publisher
National University of Science and Technology MISiS
Cited by
2 articles.
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