Comparison of the effects of Ti-and Si-containing minerals on goethite transformation in the Bayer digestion of goethitic bauxite

作     者：Guotao Zhou Yilin Wang Tiangui Qi Qiusheng Zhou Guihua Liu Zhihong Peng Xiaobin Li Guotao Zhou;Yilin Wang;Tiangui Qi;Qiusheng Zhou;Guihua Liu;Zhihong Peng;Xiaobin Li

作者机构：School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2023年第30卷第9期

页      面：1705-1715页

核心收录：

学科分类：080603[工学-有色金属冶金] 08[工学] 0806[工学-冶金工程] 0804[工学-仪器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：the financial support provided by the National Natural Science Foundation of China (No.52104353) the National Key Research and Development Program of China (No.2022YFC3900900) 

主　　题：goethite magnetite kaolinite anatase Bayer digestion 

摘      要：Goethitic bauxite is a widely used raw material in the alumina *** is an essential prerequisite to clarify the effect of Ti-and Si-containing minerals on goethite transformation in the Bayer digestion process,which could efficiently utilize the Fe-and Al-containing minerals present in goethitic *** this work,the interactions between anatase or kaolinite with goethite during various Bayer digestion processes were investigated using X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS),transmission electron microscopy (TEM),and scanning electron microscopy (SEM).The results showed that anatase and kaolinite hindered the transformation of *** exerted more significant effects than kaolinite due to the dense sodium titanate layer on the goethite surface after reacting with the sodium aluminate *** the reductant hydrazine hydrate could eliminate the retarding effect by inducing the transformation of goethite into *** this process,titanium was embedded into the magnetite lattice to form Ti-containing ***,the weakening of the interaction between magnetite and sodium aluminosilicate hydrate reduced the influence of *** a validation of the above results,the reductive Bayer method resulted in the transformation of goethite into goethitic bauxite with 98.87% relative alumina digestion *** obtained red mud with 72.99wt% Fe2O3could be further utilized in the steel *** work provides a clear understanding of the transformative effects of Ti-and Si-containing minerals on iron mineral transformation and aids the comprehensive use of iron and aluminum in goethitic bauxite subjected to the reductive Bayer method.