煅烧硬石膏溶解特性对钙矾石形成的影响

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (1): 201-206.

所属专题：资源综合利用

煅烧硬石膏溶解特性对钙矾石形成的影响

乔秀臣¹, 马大伟¹, 薛玉兵²

1.华东理工大学资源与环境工程学院,上海 200237;
2.山西晋能大土河热电有限公司,山西 033000

收稿日期:2020-08-03 修回日期:2020-08-28 出版日期:2021-01-15 发布日期:2021-02-07
作者简介:乔秀臣(1973—),男,教授。主要从事工业固废资源化方面的研究。E-mail:xiuchenqiao@ecust.edu.cn

Influence of Calcined Anhydrite Solubility on the Formation of Ettringite

QIAO Xiuchen¹, MA Dawei¹, XUE Yubing²

1. School of Resources and Environmental Engineering,East China University of Science and Technology,Shanghai 200237,China;
2. Shanxi Jinneng Datuhe Thermal Power Co.,Ltd.,Shanxi,033000,China

Received:2020-08-03 Revised:2020-08-28 Online:2021-01-15 Published:2021-02-07

摘要/Abstract

摘要： 本文依据循环流化床(CFB)锅炉干法脱硫温度条件,用煅烧硬石膏模拟干法脱硫产物,研究脱硫硬石膏性质对铝酸三钙(C₃A)反应生成钙矾石(AFt)的影响,探究CFB锅炉灰渣制备建材的可行性。结果表明: 820 ℃、15 min形成的硬石膏,呈边棱清晰的板状晶体,而940 ℃、15 min形成的硬石膏晶体则发生烧结现象,高温导致硬石膏溶解性能降低。煅烧硬石膏与C₃A反应生成的AFt在养护3 d后达到最多,期间820 ℃形成的硬石膏以溶解沉淀方式生成针棒状AFt;而940 ℃形成的硬石膏则以固相反应方式生成团簇AFt。长期空气养护过程中的碳化反应会导致AFt分解。

关键词: 硬石膏, 铝酸三钙, 钙矾石, 膨胀, 脱硫, 碳化, 溶解特性

Abstract: In this research anhydrite calcined under the dry desulphurization temperature of circulating fluid bed (CFB) boiler was used to simulate dry desulphurization product.The formation of ettringite (AFt) was investigated by curing the mixture of calcined anhydrite and tricalcium aluminate (C₃A).It was discussed in this research that the feasibility of preparing building materials using CFB ash.The results show that the anhydrite calcined at 820 ℃ for 15 min is a plate-like crystal with sharp edges,and that calcined at 940 ℃ for 15 min is partly sintered.High temperature prepared anhydrite shows lower solubility.The formation of AFt reaches the top after 3 d curing.During the period,the anhydrite formed at 820 ℃ forms needle-shaped AFt by dissolving precipitation.While the anhydrite formed at 940 ℃ forms agglomerates by solid phase reaction.The carbonization reaction during long-term air curing will cause the decomposition of AFt.

Key words: anhydrite, tricalcium aluminate, ettringite, swell, desulphurization, carbonation, solubility

中图分类号:

TU526

乔秀臣, 马大伟, 薛玉兵. 煅烧硬石膏溶解特性对钙矾石形成的影响[J]. 硅酸盐通报, 2021, 40(1): 201-206.

QIAO Xiuchen, MA Dawei, XUE Yubing. Influence of Calcined Anhydrite Solubility on the Formation of Ettringite[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(1): 201-206.

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煅烧硬石膏溶解特性对钙矾石形成的影响

Influence of Calcined Anhydrite Solubility on the Formation of Ettringite

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