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冶金渣胶凝材料对镉离子的固化性能研究

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崔孝炜, 邓惋心, 谢宇轩, 王乐. 冶金渣胶凝材料对镉离子的固化性能研究[J]. 矿产保护与利用, 2021, 41(1): 15-19. doi: 10.13779/j.cnki.issn1001-0076.2021.01.002
引用本文: 崔孝炜, 邓惋心, 谢宇轩, 王乐. 冶金渣胶凝材料对镉离子的固化性能研究[J]. 矿产保护与利用, 2021, 41(1): 15-19. doi: 10.13779/j.cnki.issn1001-0076.2021.01.002
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CUI Xiaowei, DENG Wanxin, XIE Yuxuan, WANG Le. Study on the Stabilization of Cd2+ by Cementitious Materials Prepared with Metallurgical Slag[J]. Conservation and Utilization of Mineral Resources, 2021, 41(1): 15-19. doi: 10.13779/j.cnki.issn1001-0076.2021.01.002
Citation: CUI Xiaowei, DENG Wanxin, XIE Yuxuan, WANG Le. Study on the Stabilization of Cd2+ by Cementitious Materials Prepared with Metallurgical Slag[J]. Conservation and Utilization of Mineral Resources, 2021, 41(1): 15-19. doi: 10.13779/j.cnki.issn1001-0076.2021.01.002
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冶金渣胶凝材料对镉离子的固化性能研究

  • 1.

    商洛学院 化学工程与现代材料学院, 陕西 商洛 726000

  • 2.

    商洛学院 陕西省尾矿资源综合利用重点实验室, 陕西 商洛 726000

  • 3.

    商洛学院 陕西省矿产资源清洁高效转化与新材料工程研究中心, 陕西 商洛 726000

  • 基金项目:
    陕西省高层次人才特殊支持计划项目；国家大学生创新创业训练计划项目（201911396003）；商洛市科技计划项目（SK2018-03-02）；商洛学院自然科学研究项目（17SKY026）
详细信息
    作者简介: 崔孝炜(1988-), 男, 陕西商洛人, 博士, 副教授, 主要从事固废资源化利用研究, E-mail: slcui320@slxy.edu.cn

  • 中图分类号: X751

Study on the Stabilization of Cd2+ by Cementitious Materials Prepared with Metallurgical Slag

  • 1.

    College of Chemical Engineering and Modern Materials, Shangluo University, Shangluo 726000, Shaanxi, China

  • 2.

    Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources, Shangluo University, Shangluo 726000, Shaanxi, China

  • 3.

    Shaanxi Engineering Research Center for Mineral Resources Clean & Efficient Conversion and New Materials, Shangluo University, Shangluo 726000, Shaanxi, China

    摘要

  • 以钢渣、矿渣和脱硫石膏为原料制备胶凝材料，研究了其对镉离子的固化效果。研究结果表明：在Cd2+浓度不高于30 mg/kg时，胶凝材料对镉离子吸附效果较好，主要是因为镉离子能够以"类质同象"的方式替代Ca2+进入钙矾石（AFt）的晶格和Friedel盐，形成含镉复盐而被固化，再加上C-S-H对镉的吸附作用，共同促使Cd2+被高效固化。研究结果对于含镉废水的治理具有重要意义。

    The cementitious materials were prepared with steel slag, blast furnace slag and desulfurization gypsum and its stabilization effect on Cd2+ was studied. The results showed that the cementitious materials had a better adsorption effect on Cd2+ when the concentration of Cd2+ was not higher than 30 mg/kg. The reasons were as follows. Cadmium ions could replace Ca2+ into the lattice of ettringite (AFt) and Friedel salt by a "quasi-homogeneous" manner. Then it formed a cadmium-containing double salt and was solidified. Coupled with the adsorption of C-S-H on cadmium, Cd2+ was finally cured efficiently. The research results have great significance for the treatment of wastewater containing cadmium.

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  • 图 1  钢渣的XRD图谱

    Figure 1. 

    下载: 全尺寸图片 幻灯片

    图 2  不同龄期含镉试样的XRD图谱

    Figure 2. 

    下载: 全尺寸图片 幻灯片

    图 3  含镉试样不同养护龄期的XPS(Cd)图谱(M2)

    Figure 3. 

    下载: 全尺寸图片 幻灯片

    图 4  M0和M2组试样28 d龄期时的XPS(Al)图谱

    Figure 4. 

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    图 5  AFt相结构单元

    Figure 5. 

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    表 1  原料的主要化学成分

    Table 1.  Chemical composition of materials /%

    原料 SiO2 Al2O3 Fe2O3 CaO MgO SO3 Na2O K2O TiO2 烧失量
    钢渣 19.16 7.39 18.66 43.58 7.56 0.26 0.10 0.12 1.65 1.52
    矿渣 29.15 11.37 2.66 41.23 10.67 1.11 0.27 0.32 1.45 1.77
    脱硫石膏 3.28 1.44 0.76 44.29 0.60 46.06 0.11 0.29 0.08 3.09
    下载: 导出CSV

    表 2  Cd2+浓度对固镉试样力学性能的影响

    Table 2.  Effect of Cd2+ concentration on mechanical properties of solid cadmium samples

    编号 龄期
    3 d 7 d 28 d
    M0 6.7 13.2 18.6
    M1 10.3 15.7 20.7
    M2 12.7 16.2 21.6
    M3 11.0 17.7 22.9
    下载: 导出CSV

    表 3  不同养护龄期固镉试样的Cd2+浸出浓度

    Table 3.  Cd2+ leaching concentration of Cd solid samples at different curing ages

    编号 Cd2+浸出浓度/ (mg·L-1)
    3 d 7 d 28 d
    M0 ND ND ND
    M1 0.001 ND ND
    M2 0.003 0.001 ND
    M3 0.004 0.002 ND
    注: ND代表低于检出限0.005 mg·L-1。
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收稿日期:  2021-01-05
刊出日期:  2021-02-25

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