攀枝花钒钛磁铁矿深还原渣酸解工艺研究

Study on acid hydrolysis process of deep reduction slag of Panzhihua V-Ti magnetite

在攀钢开发的非高炉冶炼钒钛磁铁矿的新流程中,钒钛磁铁矿转底炉直接还原渣铁分离部分完成了工业试验,获得了含钒铁水和含二氧化钛质量分数为43%左右的深还原渣。对深还原渣的化学成分及物相特点进行了分析,系统研究了预处理、酸矿质量比、反应酸质量分数、引发温度、熟化温度等因素对深还原渣酸解率的影响,找到深还原渣的最佳酸解工艺参数,为采用硫酸法回收深还原渣中的钛奠定了基础。实验结果表明,深还原渣经预处理,其酸解率较未处理高出10%左右。预处理后的深还原渣最佳酸解条件：酸矿质量比为（1.7~1.8）∶1,反应酸质量分数为88%~89%,引发温度为100~120℃,熟化温度为220℃。

In the new process of non-blast furnace smelting vanadium4itanium （ V - Ti ） magnetite developed by Panga- ng Corp. ,the part of V -Ti magnetite rotary hearth furnace direct reduction of iron-slag separation had completed its industrial experiment. Molten iron containing vanadium and deep reduction slag containing titanium dioxide with mass fraction of around 43% were obtained in the experiment. Chemical composition and phase characteristics of deep reduction slag were analyzed. Influences of factors, such as pretreatment, mass ratio of acid to mineral, mass fraction of reactive acid, triggering temperature, and aging temperature, on acid hydrolysis rate of deep reduction slag were systematically investigated. Optimum acid hydrolysis parameters were found,which made a good foundation for the recovery of titanium in deep reduction slag by sulfuric acid method. Results showed that pretreatment made acid hydrolysis rate increased by about 10%. Optimum conditions for acid hydrolysis after pretreatment of deep reduction slag were as follows ： mass ratio of acid to mineral was （ 1. 7 - 1.8） ： 1, mass fraction of reactive acid was 88% - 89%, triggering temperature was 100 - 120 ℃, and aging temperature was 220 ℃.