钒钛磁铁矿金属化球团还原熔分试验及渣相分析

Smelting-Separation for Metallized Pellets of Vanadium-Titanium Magnetite and Slag Phase Analysis

通过单因素试验考察了熔分温度、熔分时间和球团碱度对钒钛磁铁矿金属化球团熔分效果的影响,利用Factsage软件计算了不同碱度配比下的渣系三元相图,并结合XRD分析了熔分渣系特点,解释钒钛磁铁矿金属化球团还原熔分过程。结果表明,适当提高熔分温度、熔分时间和球团碱度有利于渣铁分离,但球团碱度超过1.0后,由于三元渣系组成移动到了高温区,使熔渣熔化性温度升高;熔分时间超过40min后,渣系中TiN逐渐增多,增加了熔渣的黏度,不利于渣铁分离。金属化球团熔分还原的最优条件为熔分温度1 550℃、球团碱度R=1.0、熔分时间40min。

Effects of smelting temperature, smelting time and basicity of metallized pellets of vanadium titanium magnetite were investigated by single factor experiments. Thermodynamics diagram of CaOSiO2 TiO2 system under various basicity was drawn by Factsage software. Characteristics of smelting slag were analyzed with XRD, and smelting-separation process for metallized pellets of vanadium-titanium magnetite was studied. The results demonstrate that appropriate increase of smelting temperature, smelting time and basicity of metallized pellets are beneficial for slag-iron separation. When basicity of metallized pellets exceeds 1.0, melting temperature of slag rises due to composition of slag system reaching to high temperature zone. When smelting time exceeds 40 min, TiN content gradually rises in slag to increase viscosity of slag and impedes slag-iron separation. The optimum smelting-separation conditions of metallized pellets include smelting temperature of 1 550℃, smelting time of 40 min, and basicity of R= 1.0.