METHOD OF PRELIMINARY ROASTING OF SULFIDE ORES AND GOLD- AND-SILVER CONTAINING PRODUCTS OF THEIR PROCESSING IN ASSAYING

摘要

FIELD: analytical chemistry; removal of sulfur, arsenic, antimony and other components involving difficulties in melting process. SUBSTANCE: proposed method includes oxidation of ores by oxygen of air in chamotte boats in muffle furnace at two roasting modes; roasting is started at temperature of 250-300 C and is continued for 10-15 min and is finished at temperature of 450-500 C continued for 10-15 min at incomplete removal of sulfur. EFFECT: reduced expenses; enhanced reliability of determination of content of gold and silver. 1 tbl