首页|微波场下基于Na2CO3大剂量添加直接碳热法还原钛铁矿

微波场下基于Na2CO3大剂量添加直接碳热法还原钛铁矿

Direct carbothermic reduction of ilmenite concentrates by adding high dosage of Na2CO3 in microwave field

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提出一种基于直接碳热还原和微波加热的钛铁矿绿色高效利用新工艺.通过添加高剂量的Na2CO3加速还原反应的进行,并且Na2CO3可以循环利用.反应原料(钛铁矿+石墨+Na2CO3)在微波场下加热至1073～1123 K,保温20 min后,主要还原产物为Na2TiO3和金属铁,其中铁的金属化率可以达到92.67％～93.21％.还原产物依次经过水洗、CO2气氛中球磨和磁选分离,最终可以得到富铁料和富钛料.其中富钛料中TiO2含量可以达到90.04％(质量分数),并可后续用于生产TiCl4或TiO2.基于金属化率、磁选分离效率和产物结瘤特性等参数,优化得到的还原温度为1123 K.此外,还提出添加Na2CO3后的钛铁矿在微波场下的还原机理.
A clean and efficient route for the utilization of ilmenite concentrates was proposed by direct carbothermic reduction in microwave field. High dosage of Na2CO3, which can be recycled, was added to accelerate the reduction reaction of ilmenite concentrates. After microwave heating in the temperature range of 1073-1123 K for 20 min, the main products were Na2TiO3 and metallic Fe with the metallization ratios being as high as 92.67％-93.21％. The reduction products were processed by water leaching, ball-milling in CO2 atmosphere and magnetic separation in turn. The final products after magnetic separation were Fe-rich materials and Ti-rich materials (90.04 wt.％TiO2), which can be used to produce iron and TiCl4 or TiO2. The optimized heating temperature was 1123 K in terms of metallization ratios, magnetic separation and caking property of the reduction products. Besides, the reduction mechanism of ilmenite concentrates with the addition of Na2CO3 in microwave field was also proposed.

ilmenite concentratesmicrowaveNa2CO3carbothermic reduction

于之刚、肖京武、冷海燕、周国治

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上海大学 材料科学与工程学院,上海 200072

上海大学 省部共建高品质特殊钢冶金与制备国家重点实验室,上海 200072

上海大学 上海市钢铁冶金新技术开发应用重点实验室,上海 200072

钛铁精矿 微波 Na2CO3 碳热还原

This work was financially supported by the National Natural Science Foundation of ChinaThis work was financially supported by the National Natural Science Foundation of ChinaChina Postdoctoral Science FoundationIndependent Research and Development Project of State Key Laboratory of Advanced Special Steel,Shanghai Key Laboratory of Advanc

51734002514741412020M671071SKLASS 2019-Z014

2021

10.1016/S1003-6326(21)65619-4

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(6)
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