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投稿时间：2019-03-25 修订日期：2019-03-27 录用日期：2019-04-01 网络发布日期：2019-07-15
投稿时间：2019-03-25 修订日期：2019-03-27 录用日期：2019-04-01 网络发布日期：2019-07-15
中文摘要: 为实现深海多金属结核高效冶炼，拟采用回转窑预还原—全氧熔池熔分新工艺。针对回转窑预还原阶段，研究了温度对深海多金属结核预还原的影响，结果表明，MnO2逐渐还原为Mn2O3、MnO，最终生成Mn；Fe2O3还原为Fe3O4、FeO，最终生成Fe；CuO、CoO、NiO等直接还原为Cu、Co、Ni。预还原温度越高样品预还原程度越完全。在1 300 ℃时样品综合还原效果最显著，出现金属熔化重新凝聚现象，反应后样品中出现球状金属颗粒；在相同温度下，还原时间由1 h增加到2 h时，还原效果显著增强。
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.
keywords: deep-sea polymetallic nodules prereduction rotary kiln elements migration phase transition
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基金项目:国家重点研发计划（2017YFB0603801）
引用文本：
周磊,居殿春,周夏芝,徐玉松,程相魁,齐渊洪.深海多金属结核回转窑预还原的研究[J].有色金属（冶炼部分）,2019(8):25-30.
ZHOU Lei,JU Dianchun,ZHOU Xiazhi,XU Yusong,CHENG Xiangkui,QI Yuanhong.Study on Pre-reduction of Deep-sea Polymetallic Nodules in Rotary Kiln[J].Nonferrous Metals (Extractive Metallurgy),2019(8):25-30.
周磊,居殿春,周夏芝,徐玉松,程相魁,齐渊洪.深海多金属结核回转窑预还原的研究[J].有色金属（冶炼部分）,2019(8):25-30.
ZHOU Lei,JU Dianchun,ZHOU Xiazhi,XU Yusong,CHENG Xiangkui,QI Yuanhong.Study on Pre-reduction of Deep-sea Polymetallic Nodules in Rotary Kiln[J].Nonferrous Metals (Extractive Metallurgy),2019(8):25-30.
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