Effect of Na2CO3 and CaCO3 on Coreduction Roasting of Blast Furnace Dust and High-phosphorus Oolitic Hematite

查看全文 作　　者：[1]曹允业;[1]孙体昌;KOU [1]Jue;XU [1]Chengyan;GAO [1]Enxia

机构地区：[1]School of Civil & Environmental Engineering, Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education University of Science and Technology Beijing, Beijing 100083, China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》索引2017年第32卷第3期,共8页

基　　金：Funded by National Natural Science Foundation of China(No.51134002) 摘　　要：Iron was recovered from blast furnace dust and high-phosphorus oolitic hematite in the presence of Na_2CO_3 and CaCO_3 additives. The functions of Na_2CO_3 and CaCO_3 during the coreduction roasting process were investigated by XRD and SEM-EDS analyses. Results indicate that these additives not only hinder the reduction of fluorapatite, CaCO_3 also decreases the P content of direct reduced iron(DRI) by increasing the reduction alkalinity. P remains as fluorapatite in the slag, which can be removed by grinding and magnetic separation under optimal conditions. The Na_2CO_3 promotes hematite reduction and improves the iron recovery(εFe) by replacing the FeO from fayalite, which results in quick growth and aggregation of metallic iron and improvement of ε_(Fe) in DRI. A DRI with 91.88 mass% Fe, and 0.065 mass% P can be achieved at a recovery of 87.86 mass% under the optimal condition. 关键词：鲕状赤铁矿高炉粉尘焙烧过程碳酸钙共还原碳酸钠高磷 SEM-EDS

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Effect of Na2CO3 and CaCO3 on Coreduction Roasting of Blast Furnace Dust and High-phosphorus Oolitic Hematite

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