偏タングステン酸アンモニウム(AMT)の工業生産工程

工業規模でのAMTの製造は、通常、イオン交換法と酸化法の利点を組み合わせて、統合プロセスを形成します。典型的な工業プロセスは次のステップを含みます:

  • 原料の前処理: APTまたはタングステン酸ナトリウムは、タングステン鉱から抽出され、出発原料として使用されます。
  • 反応システム: 大型反応釜で酸化またはイオン交換を行い、攪拌装置や温度調整装置が備えられています。
  • 濃縮結晶化: 蒸発器を使用して溶液を濃縮し、結晶槽で冷却してAMTを析出させます。
  • 分離と乾燥: 遠心分離機で結晶を分離し、オーブンで乾燥して水分含量を5%未満にします。

主要な工業パラメータは次の通りです:

  • pH値: AMTの安定した範囲は2〜4です。pHが低すぎるとタングステン酸が生成され、高すぎるとAPTが析出します。
  • 温度: 結晶化時は80〜100°Cで制御され、温度が高すぎると結晶の品質に影響を与える可能性があります。
  • 濃度: 溶液中のWO₃含量は200〜300g/Lに達する必要があり、これにより高い収率が確保されます。

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