History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c13.s2.t4.195
History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c13.s2.t4.195
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v1.c13.s2.t4.195
(1) Sizing and Roasting of Sulphide Ore: After sizing and beneficiation, as described earlier, the ore was mixed with charcoal dust and fired into a heap to convert it into oxide by controlled roasting in an oxidizing atmosphere. During this process ZnS, PbS and other sulphide mineral got converted to their respective oxide but no reduction of these oxides by carbon was permitted.