pyrometallurgy

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py·ro·met·al·lur·gy

 (pī′rō-mĕt′l-ûr′jē)
n. pl. py·ro·met·al·lur·gies
An ore-refining process, such as smelting, dependent on the action of heat.

py′ro·met′al·lur′gi·cal (-mĕt′l-ûr′jĭ-kəl) adj.

pyrometallurgy

(ˌpaɪrəʊmɛˈtælədʒɪ; -ˈmɛtəˌlɜːdʒɪ)
n
(Metallurgy) the branch of metallurgy involving processes performed at high temperatures, including sintering, roasting, smelting, casting, refining, alloying, and heat treatment

py•ro•met•al•lur•gy

(ˌpaɪ rəˈmɛt lˌɜr dʒi)

n.
the process or technique of refining ores with heat, as in roasting or smelting.
[1905–10]
py`ro•met`al•lur′gi•cal, adj.