Characterization of fluidized reduction roasting of nickel laterite ore under CO/CO_(2)atmosphere  

CO/CO_(2)气氛下红土镍矿流态化还原焙烧特性研究

作　　者：ZHENG Si-qi ZHANG Hai-xia WANG Xiao-fang HU Hui ZHU Zhi-ping 郑思奇;张海霞;王小芳;虎慧;朱治平(Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China Central South University 2024)

机构地区：[1]Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China [2]University of Chinese Academy of Sciences,Beijing 100049,China Central South University 2024

出　　处：《Journal of Central South University》2024年第9期3068-3078,共11页中南大学学报（英文版）

基　　金：Project(XDA 29020100)supported by the Strategic Priority Research Program of the Chinese Academy of Sciences;Project(2022YFE0206600)supported by National Key R&D Program of China。

摘　　要：Fluidized reduction roasting is an efficient metallurgical technique.However,its application to nickel laterite ore has rarely been reported.In this paper,the effects of reduction temperature,reduction time,CO concentration,and material particle size on the roasting characteristics of ferronickel fluidization reduction were investigated.Combined with X-ray diffraction,scanning electron microscopy-energy dispersive spectrometry(SEM-EDS)characterization,the mineral phases and microscopic morphology of nickel laterite ore and its roasted ores were analyzed in depth.The results indicated that under the condition of a CO/CO_(2)ratio of 1:1,a reduction temperature of 800℃,and a reduction roasting time of 60 min,a nickel-iron concentrate with a nickel grade of 2.10%and an iron content of 45.96%was produced from a raw material with a nickel grade of 1.45%,achieving a remarkable nickel recovery rate of 46.26%.XRD and SEM-EDS analysis indicated that nickel in the concentrate mainly exists in the form of[Fe,Ni],while the unrecovered nickel in the tailings is primarily present in the form of[Fe,Ni]and Ni_(2)SiO_(4)in forsterite.This study established a theoretical foundation for further exploration of fluidized reduction roasting technology.流态化还原焙烧是一种高效的冶金技术,但其在红土镍矿上的应用鲜有报道。本文研究了流态化还原焙烧工艺下,还原温度、还原时间、还原剂CO浓度、物料粒度对镍铁矿还原特性的影响,结合XRD、SEM-EDS等表征手段,对红土镍矿及其焙烧矿的矿相、微观形貌等进行了深入分析。结果表明,在CO/CO_(2)比为1:1,还原温度为800℃,还原焙烧时间为60 min的条件下,以镍品位为1.45%的原料,可获得镍品位为2.10%、铁品位为45.96%的镍铁精矿,镍回收率为46.26%。XRD和SEMEDS分析表明,精矿中的镍主要以[Fe,Ni]的形式存在,尾矿中未回收的镍主要以[Fe,Ni]和镁铁橄榄石中的Ni_(2)SiO_(4)形式存在。本研究为红土镍矿流态化还原焙烧技术的进一步探索提供理论参考。

关 键 词：nickel laterite ore fluidized reduction roasting nickel grade RECOVERY 

分 类 号：TF815[冶金工程—有色金属冶金]