粉煤灰提铝后尾渣合成13X分子筛及其对Pb^(2+)吸附性能的研究

Synthesis of 13X Zeolite by Fly Ash Acid Residue and Its Adsorption Performance on Lead Ions

利用循环流化床粉煤灰"一步酸溶法"提取氧化铝后的尾渣为原料,通过碱溶—水热法合成了13X分子筛,并对样品组成进行了XRD表征,颗粒尺寸进行激光粒度测试分析,热稳定性进行了TG-DSC技术表征,详细考察了其对Pb^(2+)离子的吸附效果。结果表明:导向剂用量、老化温度、铝源等因素对分子筛合成影响显著。合成的分子筛颗粒尺寸约为2. 8μm,拥有较高的热稳定性。该分子筛对溶液中Pb^(2+)离子饱和吸附量达到35. 82 mg/g,具有较好的市场应用前景。

The tail residue obtained by one-step acid leaching of circulating fluidized bed fly ash extracting alumina,was used to synthesize13X zeolite by alkali dissolution-hydrothermal method.The results showed that the factors such as inducer amount,aging temperature and aluminum sources had significantly effects on the synthesis of zeolite.In addition,the samples were characterized by XRD,Laster-particle size analyser and TG-DSC test,and the adsorption effect on Pb^2+ was investigated in detail.The synthesized 13X zeolite has uniform particle size about 2.8μm and possesses a high thermal stability.The adsorption experiments also showed that the saturated adsorption capacity of Pb^2+ was 35.82mg/g,inferring that the new method has a preferable market prospects.