Transition of Blast Furnace Slag from Silicate Based to Aluminate Based: Electrical Conductivity
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TRODUCTION
ELECTRICAL conductivity of molten slag is a significant physical property in the metallurgical process. Such property is crucial in the comprehensive utilization of blast furnace slag with an electric arc furnace, such as the preparation of rock wool from the slag through electric arc furnace. Electrical conductivity directly relates to the power supply and heat distribution in the furnace. The heat required for slag melting is mainly supplied by the resistance heat generated by the current passing through the slag. Although the wide variation of heat efficiency can be accomplished by a change in voltage, current, and slag, the operating limit is consistently determined by the resistivity of slag.[1,2]
ZHENGDE PANG, ZHIMING YAN, and JIE DANG are with the State Key Laboratory of Mechanical Transmissions, Chongqing University, No. 174 Shazheng Street, Shapingba District, Chongqing 400044, P.R. China and also with the Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, No. 174 Shazheng Street, Shapingba District, Chongqing 400044, P.R. China. XUEWEI LV is with the State Key Laboratory of Mechanical Transmissions, Chongqing University, with the Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, and also with the College of Materials Science and Engineering, Chongqing University, No. 174 Shazheng Street, Shapingba District, Chongqing, 400044 P.R. China. Contact e-mail: [email protected] DONG LIANG is with the Research Institute of Laiwu Iron & Steel Co. Ltd. No. 23 Changsheng Street, Gangcheng District, Laiwu, 271100, P.R. China. Manuscript submitted July 31, 2018. Article published online November 30, 2018. METALLURGICAL AND MATERIALS TRANSACTIONS B
Furthermore, an inseparable relationship exists between the electrical conductivity and the network structure of the slag.[3–5] Therefore, the network structure of slag can aid in understanding a few physical properties, such as electrical conductivity and viscosity. As a result of long-term sustainable development of iron and steel industry, nearly half of high-grade iron ore reserves have been consumed in the world. Iron and steel producers have increased the utilization of low-cost and low-grade raw materials. The extensive use of low-grade iron ore has begun to affect the operation of blast furnaces. In particular, the increase in alumina in blast furnace slag has become a common phenomenon, which has resulted in the translation of the slag system from silicate based to aluminate based.[6] The translation would generate a significant variety of physicochemical properties, such as viscosity, surface tension, sulfide capacity, and electrical conductivity of slag. Therefore, as a sequence of the previous studies[7–10] that referred to the viscosity, density, surface tension, sulfide capacity, and structure of aluminosilicate slag, this study focuses on the electrical conductivity of high-alumina blast furnace slag. Several studies were previously conducted on the electrical con
