矿渣基胶凝材料固化垃圾焚烧飞灰中 重金属的研究-矿业114网 - 钱柜娱乐手机版,钱柜娱乐手机版登录,钱柜娱乐游戏平台 
矿渣基胶凝材料固化垃圾焚烧飞灰中 重金属的研究
2019-07-22
以矿渣部分或全部替代水泥,与垃圾焚烧飞灰和脱硫石膏组成胶凝材料,研究随矿渣掺量变化,胶 凝材料对垃圾焚烧飞灰重金属的固化效果。结果表明:随着矿渣替代水泥量的增大,净浆试块抗压强度呈现先增 大后减小的趋势;当飞灰掺量为 20%、矿渣掺量为 70%、脱硫石膏掺量为 10%时制成的净浆试块,在温度为 35 ℃、 湿度为95%下养护28 d,试块的抗压强度达到47 MPa,重金属元素Cr、Cd、Cu、Hg、Pb、Zn的浸出浓度均低于饮用水 标准;对 Pb、Cr 的固化效果明显优于纯水泥胶凝体系。XRD 和 FT-IR 检测表明:该矿渣基胶凝材料水化生成的主 要产物有钙矾石、C—S—H 凝胶和水铝钙石,...
Series No. 517 July 2019 金 属 METAL MINE 矿 山 总第 517 期 2019 年第 7 期 矿渣基胶凝材料固化垃圾焚烧飞灰中 重金属的研究 1 ,2 1,2 1,2 1,2 1,2 佳 王一杰 李克庆 倪 文 张思奇 李 1. 北京科技大学土木与资源工程学院,北京 100083;2. 金属矿山高效开采与安全教育部重点实验室,北京 100083) ( 摘 要 以矿渣部分或全部替代水泥,与垃圾焚烧飞灰和脱硫石膏组成胶凝材料,研究随矿渣掺量变化,胶 凝材料对垃圾焚烧飞灰重金属的固化效果。结果表明:随着矿渣替代水泥量的增大,净浆试块抗压强度呈现先增 大后减小的趋势;当飞灰掺量为 20%、矿渣掺量为 70%、脱硫石膏掺量为 10%时制成的净浆试块,在温度为 35 ℃、 湿度为 95%下养护 28 d,试块的抗压强度达到 47 MPa,重金属元素 Cr、Cd、Cu、Hg、Pb、Zn 的浸出浓度均低于饮用水 标准;对 Pb、Cr 的固化效果明显优于纯水泥胶凝体系。XRD 和 FT-IR 检测表明:该矿渣基胶凝材料水化生成的主 要产物有钙矾石、C—S—H 凝胶和水铝钙石,水化产物对重金属离子有良好的包裹作用。矿渣基胶凝体系比水泥 基胶凝材料体系在固化垃圾焚烧飞灰重金属方面优越性明显。 关键词 垃圾焚烧飞灰 矿渣基胶凝材料 水泥 重金属离子 抗压强度 中图分类号 TD926.4 文献标志码 A 文章编号 1001-1250(2019)-07-194-05 DOI 10.19614/j.cnki.jsks.201907032 The Study on Solidification of Heavy Metal Ions from Garbage Incineration Fly Ash Using Slag- based Cementitious Materials 1,2 1,2 1,2 1,2 1,22 Li Jia Wang Yijie Li Keqing Ni Wen Zhang Siqi (1. School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China; 2 . Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines,Beijing 100083,China) Abstract The slag,which is used with garbage incineration fly ash and desulfurization gypsum in the composition of ce⁃ mentitious material,replaces cement in whole or in part. The solidification effect of the cementitious materials on heavy met⁃ als from waste incineration fly ash was studied with the change of slag content. The results showed that compressive strength of the paste block first increases and then decreases with the increasing of the slag content. When the paste block is made of fly ash 20%,slag 70% and desulphurization gypsum 10%,compressive strength of the paste reaches 47 MPa for 28 days mainte⁃ nance in the temperature of 35 ℃ and the humidity of 95%. The heavy metal irons leaching concentration of Cr,Cd,Cu,Hg, Pb and Zn were all lower than the standard of drinking water. The solidification effect of Pb and Cr is better than that of ce⁃ ment cementitious system. The detection results of XRD and FT-IR indicated that the major hydration products of slag-based cementitious materials are ettringite,C-S-H gel and hydrocalumite,which show good encapsulation effect on heavy metal ions. Compared with cement gelled system,slag-based cementitious material system has obvious superiority in curing heavy metals irons from garbage incineration fly ash. Keywords Garbage incineration fly ash,Slag-based cementitious materials,Cement,Heavy me