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Citation: YI Li, FU Ying-Huan, MA Hong-Chao, WANG Yong-Wei, YU Chun-Ling, DONG Xiao-Li. Synthesis of 4A Zeolite from Alkali-activated Bentonite[J]. Chinese Journal of Applied Chemistry, ;2009, 26(6): 1445-1449. shu

Synthesis of 4A Zeolite from Alkali-activated Bentonite

1.
School of Chemical Engineering & Materials, Dalian Polytechnic University, Dalian 116034

Corresponding author: FU Ying-Huan,
Received Date: 7 December 2008
Available Online: 20 March 2009
Fund Project: 辽宁省科技厅资助项目(05L074,05L081) (05L074,05L081)

Bentonite reacted with NaOH at a high temperature leading to a very reactive starting material for zeolite synthesis.Zeolite 4A was synthesized by hydrothermal method with natural bentonite as raw material.The effects of activation temperature,molar ratio of SiO₂/Al₂O₃,molar ratio of Na₂O/SiO₂,molar ratio of H₂O/Na₂O on the properties of the products were investigated by means of XRD,SEM and calcium ion exchange capacity.The results show that the best activation temperature was 600 ℃.After activation of the materials,the composition of the mixed compound was regulated as(molar ratio):SiO₂/Al₂O₃ =1.5,Na₂O/SiO₂=3 and H₂O/Na₂O=50,then crystallization was carried out at 90 ℃ for 6 h.Under the optimal conditions,zeolite 4A with a high degree of crystallinity,a small granularity of particles(most of the particle size of zeolite 4A was less than 2 μm) and high calcium ion exchange capacity(314 mg CaCO₃/g) was obtained.
- Bentonite,
- alkali-activation,
- zeolite 4A
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