the process or technique of refining ores with heat so as to accelerate chemical reactions or to melt the metallic or nonmetallic content.

1905–10; pyro- + metallurgy

pyrometallurgical, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pyrometallurgy (ˌpaɪrəʊmɛˈtælədʒɪ, -ˈmɛtəˌlɜːdʒɪ)
the branch of metallurgy involving processes performed at high temperatures, including sintering, roasting, smelting, casting, refining, alloying, and heat treatment

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Pyrometallurgy involves high-temperature processes such as fire refining, smelting, or roasting.
Includes the disciplines of hydrometallurgy and pyrometallurgy.
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