不同还原方法对赤铁矿粉金属化率的影响  

INFLUENCE OF DIFFERENT REDUCTION METHODS ON METALLIZATION RATE OF HEMATITE POWDER

作　　者：权娟娟[1] 孙毅[2] 李玉祥[2] 张凯峰[3] 

机构地区：[1]西京学院工程技术系,西安710123 [2]西安建筑科技大学材料与矿资学院,西安710055 [3]中建商品混凝土有限公司,武汉430070

出　　处：《粉末冶金工业》2013年第3期32-36,共5页Powder Metallurgy Industry

基　　金：陕西省自然科学基础研究计划项目(编号2011JQ7011)

摘　　要：对粒径40～160μm的赤铁矿粉进行直接还原的实验研究,利用H2作为还原气体在竖直管式炉中流态化焙烧还原,利用固体C在马弗炉中静态堆积原位焙烧还原。结果表明,随着赤铁矿粉粒径变小、反应温度提高、反应时间增加、还原气体流量增大,赤铁矿还原速率增大,金属化率明显提高。以H2作为还原气体反应30min,金属化率可达94.60%。煤基堆积静态直接还原赤铁矿粉,以同心圆布料,1100℃下还原3.5h,金属化率达到96.85%。Direct reduction experiments of the hematite power with particle size of 40-160μm were conducted. H2 was used as reducing gas to reduce the fluidized hematite powder in a vertical tubular furnace, while coal was used as reducing agent to reduce the static accumula- tive hematite power in a muffle furnace. The results showed that the decreasing particle size of hematite powder led to the increases of reaction temperature, reaction time, reaction gas flow, reduction rate of hematite and metallization rate, respectively. Correspondingly, the metallization rate reached 96.85% after reduction of the hematite powder at 1100 ℃ for 3.5 h, while coal served as reducing agent and showed concentric circle diffusion with the hema- tite powder.

关 键 词：赤铁矿粉 直接还原 金属化率 

分 类 号：TF123.1[冶金工程—粉末冶金]