Abstract
Basicity has an important effect on the behavior of high-chromium vanadium-titanium magnetite (HCVTM) sinter. The effect of basicity on sintering, reduction, and softening-melting properties was investigated in an experiment-scale sinter pot. The results showed that with the basicity increasing from 1.7 to 2.5, the vertical sinter speed, the productivity, the particle size, the reduction disintegration index (RDI), and the reducibility index (RI) increased. The yield increased first and then decreased, while the tumble index (TI) had the opposite trend. The perovskite content increased first and then stabilized, and the silico-ferrite of calcium and aluminum (SFCA) increased from the basicity of 2.3. The HCVTM sinter had a better tendency of the softening behavior with the basicity increase. In addition, the melt droplet comprehensive index S increased, which indicated that the increase in basicity negatively affected the droplet performance. As the basicity increased, the comprehensive index value increased. Considering the adverse effect of basicity on softening-melting properties, the best recommended value is 2.3.
Highlights
In recent years, a kind of high-chromium vanadium-titanium magnetite (HCVTM) was discovered in Hongge Town, Sichuan Province, China, and the reserves exceed 3.6 billion tons
Wang [8] studied the effect and function mechanism of sinter basicity on softening-melting behaviors of mixed burden made from chromium-bearing vanadium-titanium magnetite, which confirmed that the proper sinter basicity value is not lower than 2.13 for smelting mixed burden in the blast furnace (BF)
Zhou [11] studied the influence of basicity on Russian chromium-bearing vanadium-titanium magnetite sinter properties, which confirmed that the optimal basicity value for industrial application was 2.55
Summary
A kind of high-chromium vanadium-titanium magnetite (HCVTM) was discovered in Hongge Town, Sichuan Province, China, and the reserves exceed 3.6 billion tons. High-chromium vanadium-titanium magnetite (HCVTM) containing various kinds of valuable elements (Fe, Ti, Cr, and V) can satisfy the need for Ti, Cr, and V metals, as well as their alloys [3,4]. Wang [8] studied the effect and function mechanism of sinter basicity on softening-melting behaviors of mixed burden made from chromium-bearing vanadium-titanium magnetite, which confirmed that the proper sinter basicity value is not lower than 2.13 for smelting mixed burden in the BF. Studies have been carried out on low- and high-alumina iron ore fines to find out the influence of sinter basicity increase on sinter mineralogy, properties, and productivity. Zhou [11] studied the influence of basicity on Russian chromium-bearing vanadium-titanium magnetite sinter properties, which confirmed that the optimal basicity value for industrial application was 2.55. The study on sinter basicity of the HCVTM sinter provides a theoretical basis and technical support for BF smelting HCVTM and promotes smelting and energy saving in the pre-alloying process
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