基于亚硝酸根插层LDHs的高效水泥降铬剂研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (5): 1542-1550.

所属专题：水泥混凝土

基于亚硝酸根插层LDHs的高效水泥降铬剂研究

袁波^1,2,3, 赵亮¹, 李博¹, 陈伟^1,3, 唐佩^1,3, 曹海琳⁴, 郭悦⁴

1.武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070;
2.武汉理工大学材料科学与工程学院,武汉 430070;
3.湖北三峡实验室,宜昌 443007;
4.深圳市航天新材科技有限公司,深圳 518057

收稿日期:2023-02-20 修订日期:2023-03-18 出版日期:2023-05-15 发布日期:2023-06-01
通信作者: 李博,博士。E-mail:lipt712@163.com
作者简介:袁波(1987—),男,博士,副教授。主要从事生态建筑材料研究。E-mail:yuan.bo@whut.edu.cn
基金资助:
国家重点研发计划(2019YFC1904900);国家自然科学基金青年项目(52102031,51902235,52108245);深圳科技计划项目协同创新专项(CJGJZD20200617102601003)

High Efficiency Chromium Reducing Agent for Cement Based on Nitrite Intercalated LDHs

YUAN Bo^1,2,3, ZHAO Liang¹, LI Bo¹, CHEN Wei^1,3, TANG Pei^1,3, CAO Hailin⁴, GUO Yue⁴

1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;
2. School of Material Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;
3. Hubei Three Gorges Laboratory, Yichang 443007, China;
4. Shenzhen Aerospace New Materials Technology Co., Ltd., Shenzhen 518057, China

Received:2023-02-20 Revised:2023-03-18 Online:2023-05-15 Published:2023-06-01

摘要/Abstract

摘要： 基于层状双氢氧化物(LDHs)结构可重建性,制备亚硝酸根插层的LDHs。将亚硝酸根插层的LDHs作为新型降铬外加剂掺入水泥,研究LDHs降铬效率、耐存储性和球磨温度处理条件下的稳定性,并揭示其还原和固化水泥中可溶性Cr⁶⁺的作用机理。结果表明,与水拌和后LDHs-NO₂层间释放的亚硝酸根离子能够快速还原水泥中的Cr⁶⁺,有效降低可溶性Cr⁶⁺含量。掺入0.2%(质量分数)LDHs-NO₂可使水泥中可溶性Cr⁶⁺含量从40.26 mg/kg降至9.36 mg/kg,同时水泥3 d抗压强度增加约2 MPa。还原后的Cr³⁺与层板中的Al³⁺进行离子交换进入LDHs层板,从而实现稳定的化学固化。亚硝酸根插层LDHs的还原效率优于FeSO₄·7H₂O,并且在长时间储存和球磨温度处理条件下仍能保持优异的还原能力。

关键词: 层状双氢氧化物, 六价铬, 水泥, 钢渣, 还原效率, 固废资源化利用, 生料替代

Abstract: Based on the structural reconstruction ability of layered double hydroxides (LDHs), the nitrite intercalated LDHs were prepared. In this paper, nitrite intercalated LDHs was added into cement as a new type of chromium reducing admixture. Reduction efficiency, resistance to storage and stability under ball milling temperature conditions of nitrite intercalated LDHs were investigated. The mechanism of reduction and solidification of soluble Cr⁶⁺ in cement using nitrite intercalated LDHs was revealed. The results show that nitrite ions released from LDHs-NO₂ interlayer mixing with water rapidly reduce soluble Cr⁶⁺ and effectively decrease soluble Cr⁶⁺ content in cement. The addition of 0.2%(mass fraction) LDHs-NO₂ reduces the soluble Cr⁶⁺content in cement from 40.26 mg/kg to 9.36 mg/kg, and improves the compressive strength of cement by about 2 MPa. The reduced Cr³⁺ exchanges with Al³⁺ into LDHs laminate to achieve stable chemical solidification. The reduction efficiency of synthetic nitrite intercalated LDHs is better than FeSO₄·7H₂O. Furthermore, synthetic nitrite intercalated LDHs remains reductive stability when the cement is stored for a period and treated at ball mill temperature.

Key words: layered double hydroxide, hexavalent chromium, cement, steel slag, reduction efficiency, solid waste recycling, raw material substitution

中图分类号:

TQ172.1

袁波, 赵亮, 李博, 陈伟, 唐佩, 曹海琳, 郭悦. 基于亚硝酸根插层LDHs的高效水泥降铬剂研究[J]. 硅酸盐通报, 2023, 42(5): 1542-1550.

YUAN Bo, ZHAO Liang, LI Bo, CHEN Wei, TANG Pei, CAO Hailin, GUO Yue. High Efficiency Chromium Reducing Agent for Cement Based on Nitrite Intercalated LDHs[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(5): 1542-1550.

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基于亚硝酸根插层LDHs的高效水泥降铬剂研究

High Efficiency Chromium Reducing Agent for Cement Based on Nitrite Intercalated LDHs

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