Study on the Stabilization of Pb2+ by Cementitious Materials Prepared with Metallurgical Slag
-
摘要:
以钢渣、矿渣和脱硫石膏为原料制备胶凝材料,研究了铅离子浓度和养护工艺对胶凝材料固铅效果的影响,并利用XRD和SEM对固铅胶凝材料的水化产物进行了分析。结果表明,冶金渣胶凝材料相对于水泥具有更高的固铅效率。冶金渣胶凝材料水化产物中存在的多种协同作用是其固铅效率显著高于水泥的重要原因。
Abstract:Taking steel slag powder (SS), blast furnace slag (BFS) and desulfurization gypsum (DG) as the ingredients for cementitious materials, the effect of the concentration of lead ions and curing process on the lead fixation were studied. The hydration products of lead-containing cementitious materials were analyzed by XRD and SEM. Cementitious materials prepared with solid waste have higher lead fixation efficiency than cement materials. The various synergistic effects existing in the hydrated products of cementitious materials, are the primary reason for its superior lead fixation efficiency than that of cement.
-
Key words:
- metallurgical slag /
- cementitious materials /
- cement /
- stabilization /
- synergy
-
-
表 1 主要原料化学成分分析结果 /%
Table 1. Chemical composition analyses of raw materials
原料 SiO2 Al2O3 Fe2O3 CaO MgO SO3 Na2O K2O TiO2 钢渣 18.16 6.24 17.66 42.58 5.26 0.29 0.12 0.12 1.60 矿渣 26.15 13.49 2.96 41.41 10.09 0.83 0.27 0.35 1.67 脱硫石膏 3.14 1.48 0.71 45.31 0.58 47.26 0.10 0.35 0.07 表 2 含铅净浆试样的浸出结果
Table 2. Leaching results of lead-containing samples
编号 试验配比 Pb2+浓度/(mg·L-1) 钢渣 矿渣 石膏 铅溶液 3 d 7 d 28 d A1 0.1% ND ND ND A2 30% 60% 10% 0.3% ND ND ND A3 0.5% ND ND ND B1 0.1% 0.10 0.07 0.005 B2 P·I 32.5水泥 0.3% 0.10 0.09 0.004 B3 0.5% 0.15 0.13 0.11 注:ND表示低于检出限0.005 mg·L-1。 表 3 高温养护时含铅试样的浸出结果
Table 3. Leaching results of lead-containing samples curing at 30 ℃
编号 试验配比 Pb2+浓度/(mg·L-1) 钢渣 矿渣 石膏 铅溶液 3 d 7 d 28 d C1 30% 60% 10% 0.5% ND ND ND D1 P·I 32.5 水泥 0.5% 0.10 0.05 0.003 -
[1] 侯艳伟, 安增莉, 方青松.城市土壤重金属铅污染研究现状[J].环境科学导刊, 2011, 30(1):58-62. doi: 10.3969/j.issn.1673-9655.2011.01.016
[2] 林星杰.铅冶炼行业重金属污染现状及防治对策[J].有色金属工程, 2011, 1(6):23-27. http://d.old.wanfangdata.com.cn/Periodical/ysjs201104005
[3] 房增强.铅锌矿区土壤重金属污染特征及稳定化研究[D].北京: 中国矿业大学(北京), 2016.
http://cdmd.cnki.com.cn/Article/CDMD-11413-1016282392.htm [4] 杜延军, 谭钟杨.水泥固化处理重金属污染土的研究进展[C].第十届全国地基处理学术讨论会, 南京: 东南大学出版社, 2008: 185-187.
http://www.wanfangdata.com.cn/details/detail.do?_type=conference&id=6798023 [5] Thevenin G, Pera J. Interaction between lead and different binders[J]. Cem. concr. res. 1999, 29(10):1605-610. doi: 10.1016/S0008-8846(99)00144-1
[6] 王向阳, 刘晶晶, 查甫生, 等.氯盐侵蚀作用对水泥固化铅污染土化学稳定性的影响[J].东南大学学报(自然科学版), 2016, 46(S1):169-173. http://d.old.wanfangdata.com.cn/Periodical/dndxxb2016z1030
[7] 刘兆鹏, 杜延军.水泥固化铅污染粘土的pH-Dependent试验研究[J].南京工程学院学报(自然科学版), 2013, 11(4):47-51. http://d.old.wanfangdata.com.cn/Periodical/njgcxyxb-zrkxb201304008
[8] 蓝俊康, 丁剀, 吴孟.钙矾石对Pd(Ⅱ)的化学俘获[J].桂林工学院学报, 2009, 29(4):531-533. doi: 10.3969/j.issn.1674-9057.2009.04.023
[9] 阎爱云, 倪文, 黄晓燕, 等.膏体充填用矿渣——钢渣基胶结剂协同固化Pb2+[J].工程科学学报, 2016, 38(7):899-905. http://d.old.wanfangdata.com.cn/Periodical/bjkjdxxb201607002
[10] 崔孝炜, 倪文, 任超.钢渣矿渣基全固废胶凝材料的水化反应机理[J].材料研究学报, 2017, 31(9):687-694. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=QKC20172017111600003637
[11] 吴贝.钙矾石对重金属的固化及稳定性研究[D].武汉: 武汉理工大学, 2011.
http://cdmd.cnki.com.cn/Article/CDMD-10497-1011105504.htm -