Lead Stabilization Mechanisms of AlPO<SUB>4</SUB> Prepared from Waste Acid Etchant in Municipal Solid Waste Incineration Fly Ash

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  • Kaikake Katsuya
    Department of Deveropment, Ryoko Lime Industry Co., Ltd. Interdisciplinary Graduate School of Agriculture and Engineering, University of Miyazaki
  • Sekito Tomoo
    Department of Civil and Environmental Engineering, Faculty of Engineering, University of Miyazaki
  • Tsunomori Michito
    Department of Deveropment, Ryoko Lime Industry Co., Ltd.
  • Dote Yutaka
    Department of Civil and Environmental Engineering, Faculty of Engineering, University of Miyazaki

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Other Title
  • 廃リン酸から合成したリン酸アルミニウムによる飛灰中の鉛不溶化メカニズム
  • ハイリンサン カラ ゴウセイ シタ リンサン アルミニウム ニ ヨル ヒカイ チュウ ノ ナマリ フヨウカ メカニズム
  • Lead Stabilization Mechanisms of AlPO4 Prepared from Waste Acid Etchant in Municipal Solid Waste Incineration Fly Ash

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Abstract

The purpose of this study was to find lead stabilization mechanisms for fly ash with AlPO4 (WAP) synthesized from a waste-phosphorus solution produced from the etching process in liquid crystal manufacture and an Al(OH)3 solution. The results of JLT 13 showed that the synthesized WAP had greater lead stabilization ability than commercial Al(OH)3(CAH). Two lead stabilization mechanisms were identified. One mechanism is a decrease in pH caused by the formation of Friedel′s salt, apatite and aluminum hydroxide through the dissolution of WAP. In the presence of NaCl instead of CaCl2 as a major salt in fly ash, Friedel′s salt was observed using WAP and CAH. However, a decrease in pH using WAP and an increase in pH using CAH were observed. Neutralizing the alkali generated in Friedel′s salt formation by phosphoric acid causes WAP to decrease pH in the presence of NaCl. The second mechanism was that dissolved phosphoric acid reacts with lead to form insoluble lead chloroapatite and lead phosphate. In addition, the result of a low pH leaching test suggested that WAP has a high lead stabilization ability in acid conditions.

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