Synthesis of 13X Zeolite by Fly Ash Acid Residue and Its Adsorption Performance on Lead Ions
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摘要:
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Pb2+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2.8 μm，拥有较高的热稳定性。该分子筛对溶液中Pb2+离子饱和吸附量达到35.82 mg/g，具有较好的市场应用前景。
Abstract:The tail residue obtained by one-step acid leaching of circulating fluidized bed fly ash extracting alumina, was used to synthesize 13X 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 Pb2+ was investigated in detail. The synthesized 13X zeolite has uniform particle size about 2.8 μm and possesses a high thermal stability. The adsorption experiments also showed that the saturated adsorption capacity of Pb2+ was 35.82 mg/g, inferring that the new method has a preferable market prospects.
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Key words:
- fly ash /
- residue /
- hydrothermal /
- 13X zeolite /
- adsorption /
- lead
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表 1 白泥成分 /%
Table 1. Composition analysis of fly ash leached by hydrochloride acid
成分 SiO2 Al2O3 Fe2O3 MgO CaO Na2O K2O TiO2 LOI 总和 含量 68.46 12.98 0.28 0.23 0.47 0.03 0.19 3.98 13.48 100.10 
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