摘要:
采用加压可视流化床装置,对巴西铁矿粉流态化还原行为进行研究,发现适当地增加压力可以提高金属化率,添加碳粉可以改善流化状态。为进一步优化还原时间、还原压力、还原气体线速度、还原温度、碳粉含量和碳粉粒径等因素对巴西铁矿粉还原的影响,采用六因素三水平正交试验方法,对还原后巴西铁矿粉样品进行金属化率和粘结比检测,发现不同还原条件对巴西铁矿粉的影响规律。研究发现纯氢气流态化还原巴西铁矿粉的最佳条件为:还原温度为923~1 023 K,还原气体线速度0.6 m/s,还原时间30~50 min,还原压力0.25 MPa,碳粉质量分数2%~6%(占矿粉质量),碳粉粒径4~7μm。
Abstract:
The reduction behavior of Brazilian iron ore powder was studied in a pressurized visible fluidized bed.It was found out that the metallization rate was increased by increasing the pressure properly,and the fluidization state improved by adding carbon powder.In order to further optimize the effects of reduction time,reduction pressure,linear velocity of reduction gas,reduction temperature,carbon content and particle size on the reduction of Brazilian mineral powder,six factors and three levels orthogonal experiment method were used to test the bond ratio and metallization rate of Brazilian mineral powder samples after reduction.Experiments resultsindicated that different reduction conditions had different effects on the reduction of Brazilian mineral powder.Optimum reduction temperature of Brazilian ore powder by pure hydrogen was 923～1 023 K,the linear velocity of reduction gas was 0.6 m/s,the reduction time was 30～50 min,the reduction pressure was 0.25 MPa,the content of carbon powder was 2%～6%（accounting for the quality of ore powder） and the particle size of carbon powder was 4～7 μm.
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