mineraalsete materjalide (maakide) kuumutus allpool sulamistemperatuuri, õhu või hapniku juurdepääsu tingimustes lisandite (nt väävel, süsinik jms) oksüdeerimise eesmärgil järgneva metallisulatuse effektiivistamiseks (vrd kaltsineerimine)
heating an ore below its melting point in the presence of air (or oxygen) to oxidize the impurities eg sulphur, carbon, etc for facilitating smelting (compare: calcination)
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