열분해법은 중텅스텐산암모늄(APT)을 원료로 사용하여 고온 처리로 직접 편텅스텐산암모늄(AMT)을 제조하는 방법입니다. 공정 흐름은 다음과 같습니다:
- 가열 분해: APT를 200-300℃ 환경에 두어 부분적으로 분해시켜 암모니아 가스(NH₃)와 수증기를 방출시킵니다.
- 용액 처리: 분해 생성물을 물에 용해하고 pH를 조정하여 AMT를 생성합니다.
- 결정 분리: 용액을 농축한 후 냉각하여 결정화시키고, 건조하여 제품을 얻습니다.
반응 과정은 대체로 다음과 같이 나타낼 수 있습니다:
이 방법은 간단하지만 제어가 어려운 단점이 있습니다. 온도가 너무 높으면 WO₃가 직접 생성되어 수율이 감소할 수 있습니다. 따라서 열분해법은 주로 실험실 연구나 소규모 생산에 사용되며, 산업적 응용은 제한적입니다.
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