製紙スラッジ熱却灰からのゼオライトの水熱合成とその物性評価

概要

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The production of synthesized zeolite from paper sludge ash by alkali hydrothermal reaction was investigated and the physical properties of the products were measured in this study. In the combustion process of paper sludge, usually either calcium carbonate or calcium hydroxide is used as a neutralization agent. After burning, calcium oxide and unreacted calcium carbonate are remained in paper sludge ash. The effect of the calcium oxide and calcium carbonate was studied on the crystallization of zeolite and filtration characteristics of the slurry obtained from the hydrothermal reaction. In order to confirm the possibility to use zeolite as a water purification agent, the adsorption test of ammonium ion in the aqueous solution was carried out. The zeolite synthesized in this study from paper sludge ash has a sufficient cation exchange capacity, which makes a practical use possible. It was also found that calcium oxide and unreacted calcium carbonate in the ash cause the depression of filtration rate of the slurry and sedimentation rate through the reaction with sodium hydroxide. It was clarified that sodium ion in the synthesized zeolite can exchange with ammonium ion in the aqueous solution.
社団法人資源・素材学会の論文
2000-01-25