粉煤灰-粉煤灰合成沸石对Cs^+的固化  

Solidification of Cs^+ in fly ash and zeolite synthesized from fly ash

作　　者：张海军[1,2] 罗洁[2,3] 王亚举[3] 杨剑[2,4] 黄胜[3] 

机构地区：[1]西南科技大学理学院,四川绵阳621010 [2]固体废物处理与资源化教育部重点实验室,四川绵阳621010 [3]西南科技大学环境与资源学院,四川绵阳621010 [4]西南科技大学应用技术学院,四川绵阳621010

出　　处：《化工环保》2016年第4期421-427,共7页Environmental Protection of Chemical Industry

基　　金：西南科技大学博士科研基金项目(11zx7112);西南科技大学研究生创新基金项目(15ycx041)

摘　　要：以电厂废弃物粉煤灰为原料、采用碱熔-水热法制备了粉煤灰合成A型沸石(以下简称沸石),再以沸石对溶液中的Cs+进行分离富集,最后在碱激发剂的作用下以粉煤灰和吸附后的沸石制得地聚合物固化体。对固化体的性能进行了评价,并探讨了固化机理。实验结果表明:在吸附温度25℃、初始Cs+质量浓度100 mg/L、固液比10.0 g/L的条件下,沸石对的Cs+的吸附率达98%,比粉煤灰提高了2倍以上;沸石掺量为20%~30%(w)时,固化体的抗压强度符合GB 14569.1—2011要求,固化体中Cs+的42 d浸出率和累计浸出分数均远优于GB 14569.1—2011限值,表现出优异的抗浸出性能。The synthetic zeolite-A was prepared by alkali fusion-hydrothermal method using waste fly ash in power plant as raw material. The zeolite was used to isolate and enrich Cs＋ in solution, and then to form geopolymer solidified body with fly ash under the effect of activator. The performances of the solidified body were evaluated and the soidificaton mechanism was discussed. The experimental results show that： Under the conditions of adsorption temperature 25℃, initial Cs＋ mass concentration 100 mg/L and solid-liquid ratio 10.0 g/L, the equilibrium adsorption rate of Cs＋ on the zeolite is reached 98%, which is more than 2 times higher than that on fly ash; When the zeolite dosage is 20%-30% （w）, the solidified body exhibits excellent leaching resistance performances, the compressive strength of the solidified body meets the requirement in GB 14569.1-2011, and the leaching rate and accumulated leaching fraction ofCs＋ in the solidified body are far lower than the standard limits in GB 14569.1-2011.

关 键 词：粉煤灰 沸石 固化 抗压强度 浸出率 

分 类 号：X591[环境科学与工程—环境工程]