Physical properties of barite-borate slags
Orlov A.S. Kim A.S. Akberdin A.A. Sultangaziev R.B.
November 2025Springer
Metallurgist
2025#69Issue 7981 - 986 pp.
The physical properties of barite-borate slags have been studied to assess the possibility of using them in the processes of cleaning metals from harmful impurities, and in means of protection from penetrating radiation. It is recommended to prepare them from natural barite and borate ores by remelting in ore-thermal furnaces. It is proposed to form a smelting charge from 80% barite and 20% borate ores (colemanite) to achieve high basicity and mobility of the resulting melt. The Terra software package was used to establish the conditions for its production and phase composition. It is recommended to perform remelting at 1800–2000 K to form the final composition of the slag. To assess the possibility of practical production and use of barite-borate slags, their viscosity and crystallization temperature were studied. The viscosity of melts containing 80, 70, and 60% barite ore, as well as colemanite, did not exceed 0.2–0.5 Pa∙s at the furnace remelting and tapping temperatures (1800–1900 K), which characterizes them as fluid. A melt with 80% barite ore has approximately the same viscosity at high temperatures as melts with 70 and 60% barite ore. This means that higher amounts of barite ore can be used, which introduces a strong basic oxide, such as BaO. The crystallization temperature of the melts was determined from the logarithmic relationship between viscosity and reciprocal absolute temperature. For the studied melts, such temperature ranges from 1675 to 1745 K, which is quite achievable in ore-thermal furnaces. By remelting a charge with 80% barite ore and 20% colemanite in an ore-thermal furnace, the following slag composition was obtained (wt. %): BaO—62.5, B2O3—10.5, CaO—10.3, SiO2—13.7, MgO—1.1, and Al2O3—1.9. Boron losses amounted to 7.2%. The ratio of all basic to all acidic oxides, including Al2O3, was 2.83. In terms of its composition and physical properties, the obtained slag can be tested as a refining flux to remove harmful impurities from metals, as well as a means for protection against penetrating radiation.
669.046.582.5 , Barium , Boron , Crystallization temperature , Phase composition , Slag , Viscosity
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Chemical-Metallurgical Institute named after Zh. Abishev, Karaganda, Kazakhstan
Chemical-Metallurgical Institute named after Zh. Abishev
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