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| Study on Pre-reduction of Deep-sea Polymetallic Nodules in Rotary Kiln |
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Received:March 25, 2019
Revised:March 27, 2019
Accepted:April 01, 2019
Published Online:July 15, 2019
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| DOI：doi：10.3969/j.issn.1007-7545.2019.08.004 |
| KeyWord:deep-sea polymetallic nodules; prereduction; rotary kiln; elements migration; phase transition |
| Author | Institution |
| ZHOU Lei |
江苏科技大学 |
| JU Dianchun |
江苏科技大学 |
| ZHOU Xiazhi |
江苏科技大学 |
| XU Yusong |
江苏科技大学 |
| CHENG Xiangkui |
攀枝花学院国际钒钛研究院 |
| QI Yuanhong |
钢铁研究总院先进钢流程及材料国家重点实验室 |
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| Abstract: |
| New technology of pre-reduction in rotary kiln and full-oxygen bath smelting are proposed to realize high efficient smelting of polymetallic nodules. Effect of temperature on prereduction of polymetallic nodules during pre-reduction stage of rotary kiln was studied. The results show that MnO2 can be gradually reduced to Mn2O3 and MnO and even to Mn; Fe2O3 is reduced to Fe3O4 and FeO and even to Fe; CuO, CoO and NiO are directly reduced to Cu, Co, Ni. High reduction temperature enhances polymetallic nodules reduction reaction. The most remarkable reduction effect is obtained at 1 300 ℃, that phenomenon of metal melting and re-agglomeration occurs and spherical metal appears in sample. At the same temperature, when reduction time rises from 1 h to 2 h, the reduction effect is obviously enhanced. |
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