| 1 | Effect of Na2CO3 and CaCO3 on Coreduction Roasting of Blast Furnace Dust and High-phosphorus Oolitic Hematite显示文摘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. | 曹允业 孙体昌 KOU Jue XU Chengyan GAO Enxia | 2017 | Journal of Wuhan University of Technology(Materials Science)2017，32，3： | 2 |
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