Sintered bayer red mud based ceramic bricks: Microstructure evolution and alkalis immobilization mechanism

被引：58

作者：

Liu, Songhui ^{[1
]}

Guan, Xuemao ^{[1
]}

Zhang, Saisai ^{[1
]}

Dou, Zhenzhen ^{[1
]}

Feng, Chunhua ^{[1
]}

Zhang, Haibo ^{[1
]}

Luo, Shuqiong ^{[1
]}

机构：

[1] Henan Polytech Univ, Sch Mat Sci & Engn, 2001 Century Ave, Jiaozuo 454000, Henan, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2017年 / 43卷 / 15期

关键词：

Red mud; Sintering; Ceramics bricks; Permeability; Alkali; CONCRETE; TEMPERATURE; REMOVAL;

D O I：

10.1016/j.ceramint.2017.07.036

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Bayer red mud based ceramic bricks (RMCB) were produced by normal sintering and the effects of sintering temperature on their physical and mechanical properties, mineral composition and microstructure were analyzed. The water permeability and interconnected pores formation mechanism was also analyzed, as well as the pH and conductivity of RMCB leaching solution to evaluate environmental effects. The results show the RMCB to have excellent performances (compressive strength, 22.69 MPa; bulk density, 1.68 g/cm(3); total porosity, 47.12%; Linear shrinkage, 7.29%) when sintered at 1125 degrees C. Nepheline and anorthite phases formed during sintering are felt responsible for the strength of RMCB. The excellent water permeability is attributed to the creation of a network of interconnected pores within the RMCB. The pH and conductivity of RMCB are greatly reduced compared to the raw Bayer red mud leaching solution due to the stabilized aluminosilicates formed during the sintering process, thus avoiding alkaline harm to the environment.

引用

页码：13004 / 13008

页数：5

共 18 条

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