pyrometallurgy
noun
py·ro·met·al·lur·gy ˌpī-rō-ˈme-tə-ˌlər-jē 
especially British -mə-ˈta-lə-
: chemical metallurgy depending on heat action (such as roasting and smelting)
pyrometallurgical
ˌpī-rō-ˌme-tə-ˈlər-ji-kəl
adjective 
Example Sentences
Recent Examples on the Web While the ash will contain useful materials, pyrometallurgy can produce toxic fumes and limits the recovery of other valuable components. 
Shel Evergreen, Ars Technica, 19 Apr. 2022 To extract those needles, recyclers rely on two techniques, known as pyrometallurgy and hydrometallurgy. Ian Morse, Science | AAAS, 20 May 2021
Shel Evergreen, Ars Technica, 19 Apr. 2022 To extract those needles, recyclers rely on two techniques, known as pyrometallurgy and hydrometallurgy. Ian Morse, Science | AAAS, 20 May 2021 Word History
Etymology
International Scientific Vocabulary
First Known Use
1908, in the meaning defined above