INFLUENCE OF IMPURITIES IN BAUXITE TAILINGS ON PERFORMANCE OF MULLITE-BASED MULTIPHASE MATERIALS

GUO Bing-jun; MA Dong-yang; ZUO Liang-zhu; GUO Min; ZHANG Mei

doi:10.13205/j.hjgc.202110021

Volume 39 Issue 10

Jan. 2022

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GUO Bing-jun, MA Dong-yang, ZUO Liang-zhu, GUO Min, ZHANG Mei. INFLUENCE OF IMPURITIES IN BAUXITE TAILINGS ON PERFORMANCE OF MULLITE-BASED MULTIPHASE MATERIALS[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(10): 150-156. doi: 10.13205/j.hjgc.202110021

Citation:

GUO Bing-jun, MA Dong-yang, ZUO Liang-zhu, GUO Min, ZHANG Mei. INFLUENCE OF IMPURITIES IN BAUXITE TAILINGS ON PERFORMANCE OF MULLITE-BASED MULTIPHASE MATERIALS[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(10): 150-156. doi: 10.13205/j.hjgc.202110021

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INFLUENCE OF IMPURITIES IN BAUXITE TAILINGS ON PERFORMANCE OF MULLITE-BASED MULTIPHASE MATERIALS

doi: 10.13205/j.hjgc.202110021

1. Beijing Jingyeyuan New Materials Co., Ltd, Beijing 100088, China;
2. School of Metallurgy and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received Date: 2020-12-02
Available Online: 2022-01-26

Abstract

Abstract

In this paper, bauxite tailings were used as the raw material, and the acid leaching impurity removal process was adopted, concentrates with different Fe₂O₃ and K₂O contents were obtained by controlling the concentration of hydrochloric acid and the liquid-solid ratio in the process of hydrochloric acid leaching. The influence mechanism of different binary impurity composition on the microscopic morphology, phase composition, normal temperature mechanical properties and high temperature performance of the samples was studied, and the optimal hydrochloric acid concentration and the leaching liquid-solid ratio were obtained. The results showed that when the content of Fe₂O₃ and K₂O in the tailings were both less than 2.0%, the crystalline phase content and load softening temperature of the material were higher; when the content of impurity Fe₂O₃ was greater than 2.0% and greatly increased, the amorphous phase content of the material increased rapidly, performance under high temperature decreased, but performance under room temperature increased. When controlling the content of Fe₂O₃ and K₂O in the bauxite tailings of less than 2%, the load softening temperature was maintained above 1400℃, which met the requirements of the standard for commercially available NZ-45 refractory bricks.
- hydrochloric acid concentration,
- liquid-solid ratio,
- impurity content,
- mullite refractory,
- bauxite tailings

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References(14)

References

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