攀枝花钛精矿真空碳热还原热力学模拟研究

Thermodynamic Study of Carbothermal Reduction of Panzhihua Ilmenite Concentrate in Vacuum

在不同温度、体系压力和配碳量条件下,采用Fact Sage软件研究攀枝花钛精矿的真空碳热还原过程。结果表明:当温度为1 550℃,配碳量为12%时,随着压力的降低,挥发进入气相的各成分的总质量增加且渣相中的杂质含量降低,有利于提高还原反应进行的程度,获得高品质钛渣产物;当压力为100 Pa,温度为1 550℃时,随着配碳量的增加,有利于提高反应的还原效果;当压力为100 Pa,配碳量不变的条件下,温度高于1 300℃时,气相中开始出现Mg、Si O、Mn蒸气。当温度升高到1 700℃时,气相和渣相中各成分的含量趋于一个定值,渣中主要氧化物为Ti O2和Ti2O3,此时钛渣品位高达88%。

In the present work,vacuum carbothermal reduction of Panzhihua ilmenite concentrate at various temperatures,system pressures and carbon addition was simulated using Fact Sage software. The results show that the total mass of the gas phase is increased and the mass of impurities in the slag phase is decreased with decrease in system pressure under 1 550 ℃ of temperature and 12% of carbon addition,which is beneficial to improve the reaction degree and obtain titanium slag with high quality. Under a pressure of 100 Pa and a temperature of 1 550 ℃,the reduction effect of the reaction can be improved with increasing carbon addition. Under 100 Pa of pressure and 12% of carbon addition,when the temperature exceeds 1 300 ℃,Mg,Si O,Mn vapor can be produced in the gas phase. The composition content of the gas and slag phase keeps at a stable level when the temperature is higher than 1 700 ℃,and the main oxides in slag phase are Ti O2 and Ti2O3with 88% of grade for titanium slag.