In situ detoxification and mechanical properties of Al2O3-Cr2O3-CaO castables with zeolite

被引：8

作者：

Xu, Tengteng ^{[1
,2
]}

Liao, Ning ^{[1
,2
]}

Xu, Yibiao ^{[1
,2
]}

Nath, Mithun ^{[1
,2
]}

Li, Yawei ^{[1
,2
]}

Chen, Yibo ^{[1
,2
]}

Sang, Shaobai ^{[1
,2
]}

机构：

[1] Wuhan Univ Sci & Technol, State Key Lab Refractories & Met, Wuhan 430081, Peoples R China

[2] Wuhan Univ Sci & Technol, Natl Prov Joint Engn Res Ctr High Temp Mat & Lini, Wuhan 430081, Peoples R China

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2021年 / 41卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Al2O3-Cr2O3-CaO castables; Zeolite; In situ detoxification; Mechanical properties; Glass phases; CORROSION-RESISTANCE; CR(VI) FORMATION; SOLID-WASTE; CHROMIUM; EVOLUTION; HYDRATION; REFRACTORIES; TEMPERATURE; CERAMICS; BEHAVIOR;

D O I：

10.1016/j.jeurceramsoc.2020.08.060

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：

Al2O3-Cr2O3-CaO castables have been regarded as ideal linings for various furnaces owing to sufficient strength and excellent corrosion resistance. However, formation of toxic Cr(VI) is the common failing. The present work aimed at achieving in situ detoxification by introducing zeolite. The influence of zeolite on phase evolutions, mechanical properties and Cr(VI) formation were investigated. The results showed that leaching Cr(VI) at 110 degrees C was lowered by zeolite due to absorption, while chemical reduction of CaCrO4 and Ca4Al6CrO16 occurred at 500-1100 degrees C and 900-1300 degrees C, respectively. At 1300-1500 degrees C, zeolite promoted formation of (Al,Cr)(2)O-3 solid solution (+3 state). Besides, after substituting partial cement with zeolite, CMOR of castables at 110 degrees C just decreased slightly due to Ca-2(Al2SiO6)(OH)(2) formation while at 1100-1500 degrees C, CMOR increased obviously because of enhanced densification. A comparable CMOR up to 68 MPa and a remarkable Cr(VI) detoxification rate of 96.3 % could be achieved for castables with zeolite.

引用

页码：978 / 985

页数：8

共 40 条

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