煤泥作还原剂对海滨钛磁铁矿直接还原焙烧磁选的影响

以印尼某海滨钛磁铁矿为原料, 煤泥作还原剂, 研究了煤泥种类及用量、添加剂用量和直接还原焙烧过程中的焙烧时间、焙烧温度等对铁产品TFe品位与回收率、TiO₂含量的影响。结果表明, 煤泥可代替煤粉作还原剂；通过煤泥与添加剂的共同作用, 能够达到降低最终直接还原铁中钛含量的目的。在煤泥TJ用量18%、添加剂YSE用量8%、YHG用量3%, 1 250 ℃下焙烧60 min时, 得到的焙烧产物经过两段磨矿两段磁选, 最终铁产品中全铁品位达92.72%, 回收率达91.93%, TiO₂含量降至0.72%。

Effect of Coal Slime as a Reducing Agent on Direct Reduction Roasting of Seaside Titanomagnetite

With a kind of seaside titanomagnetite from Indonesia as a raw material and coal slime as a reductant, effects of types and dosage of coal slime, additive dosage, roasting time and temperature for direct reduction roasting process on TFe grade and TiO₂ content were investigated. Results showed that coal slime instead of coal powder as reducing agent, reacting with other additives, resulted in the content of titanium in DRI significantly reduced. In the test, with coal slime TJ at the dosage of 18%, additives of YSE and YHG at the dosage of 8% and 3%, respectively, a product obtained after roasting at a temperature of 1 250 ℃for 60 min, was then subjected to two-stage grinding and two-stage magnetic separation, resulting in a final DRI with TFe grade of 92.72% at the recovery of 91.93%, with TiO₂ content falling to 0.72%.