矿渣基草酸钙化学键合材料的制备及其固化重金属的研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (3): 953-958.

矿渣基草酸钙化学键合材料的制备及其固化重金属的研究

贾行伟, 罗中秋, 周新涛, 宋向荣

昆明理工大学化学工程学院,昆明 650500

收稿日期:2021-09-15 修回日期:2021-12-14 出版日期:2022-03-15 发布日期:2022-04-08
通讯作者: 宋向荣。E-mail:18213908965@163.com
作者简介:贾行伟(1991—),男。主要从事固体废弃物与资源化利用方面的研究。E-mail:jhwsunshine@163.com
基金资助:
国家自然科学基金(51662024);昆明理工大学引进人才科研启动基金(KKSY201605021);云南科技厅青年基金(KKSQ201705004);云南教育厅资助性项目(KKJB201705010)

Preparation of Slag-Based Calcium Oxalate Chemically Bonded Material and Its Solidification for Heavy Metals

JIA Hangwei, LUO Zhongqiu, ZHOU Xintao, SONG Xiangrong

Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China

Received:2021-09-15 Revised:2021-12-14 Online:2022-03-15 Published:2022-04-08

摘要/Abstract

摘要： 利用富含钙氧化物的高炉矿渣与草酸在常温进行反应制备草酸钙化学键合材料,探究了草酸(OA)和高炉矿渣(BFS)质量比对草酸钙化学键合材料力学性能的影响,以及草酸钙化学键合材料对重金属(Pb、Cd和Cu)的固化效果。结果表明,当草酸和高炉矿渣质量比为0.25时,草酸钙化学键合材料力学性能最优,其在自然养护3 d、7 d和28 d的抗压强度分别为25.70 MPa、27.86 MPa和34.79 MPa。采用XRD和SEM对草酸钙化学键合材料的物相组成和微观形貌进行分析,其主要物相为草酸钙(CaC₂O₄·H₂O),微观结构致密。在重金属(Pb和Cu)掺量为8%(质量分数)时,草酸钙化学键合材料对重金属(Pb和Cu)仍有良好的固化效果,固体浸出毒性质量浓度低于国家标准限值。研究结果为高炉矿渣制备草酸钙化学键合材料提供了参考。

关键词: 草酸盐化学键合材料, 高炉矿渣, 草酸, 抗压强度, 固化, 重金属

Abstract: In this study, calcium oxalate chemically bonded material (COCM) was fabricated through the reaction between calcium oxide-rich blast furnace slag and oxalic acid (OA) at room temperature. The effects of the mass ratios of oxalic acid to blast furnace slag (BFS) on the mechanical properties of COCM were studied, and its solidification effect for heavy metals (Pb, Cd and Cu) was further investigated. The results show that the COCM with an OA/BFS mass ratio of 0.25 has the best mechanical property. The compressive strength at 3 d, 7 d and 28 d reaches 25.70 MPa, 27.86 MPa and 34.79 MPa, respectively. XRD and SEM were used to analyze the phase composition and microstructure of COCM. The results indicate that COCM is mainly composed of calcium oxalate (CaC₂O₄·H₂O) and has tense microstructure. When the mass fraction of heavy metals (Pb and Cu) is 8%, COCM still has good solidification effect on heavy metals (Pb and Cu), and the toxic concentration of solid leaching is lower than the national standard limit. The results provide reference for preparing COCM from blast furnace slag.

Key words: oxalate chemically bonded material, blast furnace slag, oxalic acid, compressive strength, solidification, heavy metal

中图分类号:

TU526

贾行伟, 罗中秋, 周新涛, 宋向荣. 矿渣基草酸钙化学键合材料的制备及其固化重金属的研究[J]. 硅酸盐通报, 2022, 41(3): 953-958.

JIA Hangwei, LUO Zhongqiu, ZHOU Xintao, SONG Xiangrong. Preparation of Slag-Based Calcium Oxalate Chemically Bonded Material and Its Solidification for Heavy Metals[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(3): 953-958.

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