Recovery of Alkali from Bayer Red Mud Using CaO and/or MgO

被引：9

作者：

Zhou, Bingxin ^{[1
,2
,3
,4
]}

Cao, Shaotao ^{[2
,3
]}

Chen, Fangfang ^{[2
,3
]}

Zhang, Fangfang ^{[2
,3
]}

Zhang, Yi ^{[2
,3
]}

机构：

[1] Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China

[2] Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China

[3] Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China

[4] Natl Engn Res Ctr Distillat Technol, Tianjin 300072, Peoples R China

来源：

MINERALS | 2019年 / 9卷 / 05期

基金：

中国国家自然科学基金;

关键词：

recovering alkali; Bayer red mud; reaction kinetics; magnesium oxide; hydrotalcite-like compounds; BAUXITE REFINERY RESIDUES; AL-OXIDES; NEUTRALIZATION; HYDROXIDE; ALUMINUM; ANIONS; WASTE;

D O I：

10.3390/min9050269

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Recovering alkali from Bayer red mud is crucial for storage security, resource utilization and environmental protection. In this study, the addition of MgO and/or CaO was conducted to recover alkali from red mud with a hydrothermal method for the first time. A synergistic result with a residual Na2O/SiO2 weight ratio of 0.03 was obtained by adding the blend of CaO and MgO at an appropriate temperature. MgO was found to be more temperature-dependent than CaO when substituting Na2O from red mud due to their different hydration processes. The alkali recovery was controlled by a reaction at a temperature of <200 degrees C and by internal diffusion at a higher temperature for MgO, but controlled by internal diffusion for CaO in the whole temperature range studied. The formation of hydrotalcite-like compounds with a loose structure was verified with the help of XRD, FTIR, and SEM-EDS. It was proved that both the reaction kinetics and the characteristics of solid products have a significant influence on the recovery of alkali.

引用

页数：15

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