流态化还原铁矿粉抑制颗粒黏结的优化研究

摘要

Taking the commonly used Brazilian ore fines as raw material, an orthogonal test was performed to study its fluidization. The influences of reduction temperature, particle size of ore fines, the composition of reducing gas and linear velocity on the sticking of Brazilian ore fines reduction were analyzed. The results show that the primary factors of affecting the reduction of Brazilian ore fines are reduction temperature and particle size, and the best reduction process for Brazilian ore fines is temperature of 750℃, particle size of 150-420μm, hydrogen gas volume fraction of 70%, gas line velocity of 1.2 m/s.%以国内常用的巴西矿粉为原料,采用正交试验方案对铁矿粉进行流态化研究,分析还原温度、矿粉粒径、还原气成分、气流线速度等因素对巴西矿粉还原过程中黏结问题的影响,探求流化床还原铁矿粉的最佳工艺参数.结果表明:影响还原巴西矿粉的首要因素是温度和矿粉粒径;巴西矿粉最佳还原工艺为还原温度750℃、矿粉粒径150~380μm、还原气中氢气体积分数为70%、气流线速度1.2 m/s.