徳島大学 教育・研究者情報データベース(EDB)

1. 徳島大学.大学院ソシオテクノサイエンス研究部.先進物質材料部門.機能性材料(2006年4月1日〜2016年3月31日)
2. 徳島大学.先端技術科学教育部.物質生命システム工学専攻.化学機能創生コース.化学プロセス工学講座(2012年4月1日〜)

1. 杉山 茂

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2. (英) Shinomiya Ippei / (日) 四宮 一平 / (読) しのみや いっぺい

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3. (英) Kitora Ryuta / (日) 木寅 龍太 / (読) きとら りゅうた

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4. 中川 敬三

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5. 加藤 雅裕([徳島大学.大学院社会産業理工学研究部.理工学域.応用化学系.化学プロセス工学分野]/[徳島大学.理工学部.理工学科.応用化学システムコース.化学プロセス工学講座])

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(英) Recovery and Enrichment of Phosphorus from the Nitric Acid Extract of Dephosphorization Slag

(英) A method for the recovery and enrichment of the phosphate from dephosphorization slag was examined. First, the elution of aqueous phosphate from dephosphorization slag using aqueous HNO3 was examined using both the batch and flow methods. With the batch method, 82% of the dephosphorization slag could be dissolved within 30 min using 1.0 mol/L HNO3, indicating that the batch method could be used for mass processing to extract phosphorus in the bulk phase, but all components contained in the slag were unselectively dissolved. In contrast, by using 0.05 mol/L HNO3 via the flow method, 22% of the slag was dissolved for 100 min giving a more selective dissolution of phosphate from the slag compared with the batch method, which indicated that this method would be incompatible with mass processing for the purpose of extracting phosphorus in the bulk phase. In order to remove the Fe-species in the aqueous solution obtained by the batch method using 1.0 mol/L HNO3, which has been referred to as the ``slag solution,'' it was necessary to add calcium hydroxyapatite (CaHAp) to the slag solution. The optimal conditions for the removal of Fe-species using CaHAp were observed at a solution pH of ca. 1.5, which resulted in 100% removal of the Fe-species after 4 h. When the pH of the slag solution was adjusted to 7.0 after removing the Fe species, a pale pink solid sample was precipitated. The amounts of phosphate in the slag solution and in the pink solid were 3.5 and 42.0 mol%, respectively, indicating that the treatment suggested in the present study could be used for the recovery and enrichment of phosphate, that is, phosphorous, from dephosphorization slag.

(日) 脱リンスラグからのリンの回収と濃縮について検討した．回分式反応器を用いて脱リンスラグを1.0 mol/L HNO3で処理を行うと82%溶解できたが，リンを選択的に溶出できなかった．そこで0.05 mil/L HNO3で処理すると22%しか溶解できなかったが，リンを比較的選択的に溶出できた．溶解後に共存する鉄をカルシウム水酸アパタイトで除去し，溶液のpHを7.0にすることにより42%のリンを含むリン化合物を溶出させることができた．

1. (英) Dephosphorization slag
2. (英) Recovery of phosphate
3. (英) Enrichment of phosphate
4. (英) Calcium hydroxyapatite