钛/硅矿物对铝土矿拜耳法溶出过程中针铁矿转化的影响

周国涛; 王一霖; 齐天贵; 周秋生; 刘桂华; 彭志宏; 李小斌

doi:10.1007/s12613-023-2628-3

Volume 30 Issue 9

Sep. 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(9): 1705-1715

Guotao Zhou, Yilin Wang, Tiangui Qi, Qiusheng Zhou, Guihua Liu, Zhihong Peng, and Xiaobin Li, Comparison of the effects of Ti- and Si-containing minerals on goethite transformation in the Bayer digestion of goethitic bauxite, Int. J. Miner. Metall. Mater., 30(2023), No. 9, pp. 1705-1715. https://doi.org/10.1007/s12613-023-2628-3

Cite this article as:

Guotao Zhou, Yilin Wang, Tiangui Qi, Qiusheng Zhou, Guihua Liu, Zhihong Peng, and Xiaobin Li, Comparison of the effects of Ti- and Si-containing minerals on goethite transformation in the Bayer digestion of goethitic bauxite, Int. J. Miner. Metall. Mater., 30(2023), No. 9, pp. 1705-1715. https://doi.org/10.1007/s12613-023-2628-3

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研究论文

钛/硅矿物对铝土矿拜耳法溶出过程中针铁矿转化的影响

中南大学冶金与环境学院，长沙 410083，中国

通讯作者:
王一霖 E-mail: wang.yi.lin@outlook.com

李小斌 E-mail: x.b.li@csu.edu.cn

文章亮点

(1) 揭示了拜耳法溶出过程中钛/硅矿物对针铁矿转化的影响

(2) 锐钛矿因在针铁矿表面产生致密的钛酸钠层而强烈阻滞针铁矿转化

(3) 明确了还原剂消除钛/硅矿物对针铁矿转化阻滞作用的机理

中文摘要

针铁矿型高铁三水铝石矿是目前氧化铝工业广泛使用的原料。在拜耳溶出过程中，明确钛/硅矿物对针铁矿转化的影响是高效利用此类矿石中铁、铝资源的重要前提。本文研究了在拜耳法溶出过程中锐钛矿或高岭石与针铁矿之间的相互作用，研究结果表明：锐钛矿和高岭石对针铁矿的转化均有阻滞作用，锐钛矿与铝酸钠溶液反应后在针铁矿表面产生致密的钛酸钠层，从而产生更显著的影响，而高岭石反应生成的水合铝硅酸钠形成非致密吸附层影响较小；加入还原剂促进了拜耳溶出过程中磁铁矿的形成，从而有助于消除锐钛矿或高岭石对针铁矿转化的阻滞作用。在针铁矿转化过程中，钛嵌入磁铁矿晶格中，形成钛磁铁矿，同时，磁铁矿和水合铝硅酸钠之间相互作用的减弱进一步降低了高岭石的影响。最后，以几内亚高铁三水铝石矿为原料，验证了上述研究结果。在还原拜耳法溶出过程中，氧化铝相对溶出率达到98.87%，赤泥中氧化铁含量达72.99wt%，有希望通过钢铁工业大幅消纳。

关键词:

Research Article

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

+ Author Affiliations

Abstract

Abstract

Goethitic bauxite is a widely used raw material in the alumina industry. It 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 bauxite. In 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 goethite. Anatase exerted more significant effects than kaolinite due to the dense sodium titanate layer on the goethite surface after reacting with the sodium aluminate solution. Adding the reductant hydrazine hydrate could eliminate the retarding effect by inducing the transformation of goethite into magnetite. In this process, titanium was embedded into the magnetite lattice to form Ti-containing magnetite. Furthermore, the weakening of the interaction between magnetite and sodium aluminosilicate hydrate reduced the influence of kaolinite. As 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 rate. The obtained red mud with 72.99wt% Fe₂O₃ could be further utilized in the steel industry. This 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.
- goethite;
- magnetite;
- kaolinite;
- anatase;
- Bayer digestion

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References(38)

References

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钛/硅矿物对铝土矿拜耳法溶出过程中针铁矿转化的影响

文章亮点

中文摘要

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

Abstract

References

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