温度对铌精矿配碳球团铁和铌选择性还原的影响

Effect of Temperature on Selective Reduction of Fe and Nb in Carbon-matched Pellets of Niobium Concentrate

探索铌精矿选择性还原可行性,研究温度对铌精矿配碳球团铁和铌选择性还原的影响,以及含铁物相和含铌物相在还原过程中的赋存状态。结果表明,随着铌精矿还原温度的提高,铁矿物的还原金属化率也随之提高,当反应温度为1050℃时,可有效将铌精矿中赤铁矿还原为金属铁,但还原产物中尚存一定量铁橄榄石,造成还原金属化率仅76.16%。铌精矿配碳球团内部还原气氛CO含量处于72.4%附近,远未达到碳气化理论平衡时的99%。还原过程中铌矿物仍为含氧物态,有利于后续铌铁分离,可实现铌精矿中铁和铌选择性还原的工艺期望。

The feasibility was explored of selective reduction of niobium concentrate,and the effect was studied of temperature on the selective reduction of iron and niobium in carbon-matched pellets of niobium concentrate,as well as the occurrence states of iron-bearing phases and niobium-bearing phases in the reduction process.The results show that as the reduction temperature of niobium concentrate increases,the reduction metallization rate of iron minerals also increases.When the reaction temperature is 1050℃,the hematite in the niobium concentrate can be effectively reduced to metallic iron.However,there is still a certain amount of iron olivine in the reduction product,resulting in a reduction metallization rate of only 76.16%.CO content of the reducing atmosphere inside carbon-matched pellets of niobium concentrate is around 72.4%,which is significantly lower than 99%,the theoretical equilibrium value of carbon gasification.During the reduction process,niobium minerals remain in an oxygen-bearing state,which is beneficial to the subsequent separation of iron and niobium.The technological expectation of selective reduction of iron and niobium in niobium concentrate can be realized.