利用氯氧镁水泥对飞灰进行固化处理,研究了氯氧镁水泥对飞灰重金属离子的固化效果及影响因素。结果表明,氯氧镁水泥对飞灰固化存在一个最佳摩尔比,在最佳摩尔比条件下 Pb 浸出浓度最低,固化率达94%；随着活性氧化镁含量上升(由28.9%提高到60.56%),Pb 浸出浓度显著降低,固化率提高23.9%,当活性氧化镁含量进一步增加时,Pb 浸出浓度降低幅度减小；按摩尔比为10∶1,水灰比为0.3配制氯氧镁水泥,在掺量为20%的条件下,固化效果优于掺量为40%的P·O42.5水泥,且满足生活垃圾填埋标准的限值,具有很好的应用前景。
Fly ash was solidified by magnesium oxychloride cement,the solidification effects and factors of mag-nesium oxychloride cement in treating with fly ash were experimentally studied.The results indicated that fly ash treated with magnesium oxychloride cement had a optimum molar ratio.And under this condition,the leac-hing concentration was lowest,immobilized ratio was 94%;with increasing the amount of active magnesium oxide from 28.9% to 60.56%,the leaching concentration for Pb was significantly reduced and solidification ratio improved 23.9%.When the amount of active magnesium oxide was further increased,the leaching concentra-tion for Pb was found decreased slowly;magnesium oxychloride cement was prepared in molar ratio of 10∶1 water-cement ratio of 0.3,the effect of solidification of this material with 20% content got better than comment portland 42.5 cement with 40% content and it meets the landfill standard.Moreover,the new solidification agent has a bright future for application.
参考文献
| [1] | T.T. Lim;J. Chu;M.H. Goi .Effects of cement on redistribution of trace metals and dissolution of organics in sewage sludge and Its Inorganic waste-amended products[J].Waste Management,2006(11):1294-1304. |
| [2] | 蒋建国,许鑫,张妍.城市垃圾焚烧飞灰的硅酸盐水泥稳定化效果研究[J].环境科学,2006(12):2564-2569. |
| [3] | Eighmy TT;Crannell BS;Butler LG;Cartledge FK;Emery EF;Oblas D;Krzanowski JE;Eusden JD;Shaw EL;Francis CA .Heavy metal stabilization in municipal solid waste combustion dry scrubber residue using soluble phosphate[J].Environmental Science & Technology: ES&T,1997(11):3330-3338. |
| [4] | Sukandar;Tri Padmi;Masaru Tanaka .Chemical stabilization of medical waste fly ash using chelating agent and phosphates: Heavy metals and ecotoxicity evaluation[J].waste Management,2009(7):2065-2070. |
| [5] | Zhao Youcai;Song Lijie;Li Guojian .Chemical stabilization of MS W incinerator fly ashes[J].Journal of hazardous materials,2002(1/2):47-63. |
| [6] | Satoshi Mizutani;Hans A. van der Sloot;Shin-ichi Sakai .Evaluation of treatment of gas cleaning residues from MSWI with chemical agents[J].Waste Management,2000(2/3):233-240. |
| [7] | Yifei Sun;Nobuhisa Watanabe;Wei Qiao;Xingbao Gao;Wei Wang;Tianle Zhu .Polysulfide as a novel chemical agent to solidify/stabilize lead in fly ash from municipal solid waste incineration[J].Chemosphere: Environmental toxicology and risk assessment,2010(1):120-126. |
| [8] | E. Ivan Diaz-Loya;Erez N. Allouche;Sven Eklund .Toxicity mitigation and solidification of municipal solid waste incinerator fly ash using alkaline activated coal ash[J].Waste Management,2012(8):1521-1527. |
| [9] | 宁寻安,田宇,周云,刘敬勇,李磊,杨佐毅.制革污泥及其固化块的微观结构研究[J].功能材料,2012(03):405-408. |
| [10] | 李俊丽 .盐湖卤水制备硅钢级氧化镁的研究[D].中南大学,2008. |
| [11] | Scherzberg H;Kaps S;Schultheis B .Binding of heavy metals from salt-containing waters by magnesium hy-droxide[J].Freiberg,2000,59(08):170-190. |
| [12] | 闫振甲;何艳君.镁水泥改性及制品生产实用技术(第二版)[M].北京:化学工业出版社,2006 |
| [13] | 中华人民共和国环境保护行业标准[S]. |
| [14] | 中华人民共和国国家标准[S]. |
| [15] | 严育通,景燕,马军.氯氧镁水泥的研究进展[J].盐湖研究,2008(01):60-66. |
| [16] | 魏国侠,刘汉桥.医疗垃圾焚烧炉飞灰水泥固化体的浸出特性研究[J].环境卫生工程,2009(01):12-14. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%