Abstract
The mode of operation of the Nakase plant is some different from the ordinary antimony plant, because the row material is gold and silver concentrate bearing antimony, and lead, zinc and arsenic as impurities. The concentrate is briquetted and then is charged in a blast furnace with coke and low grade lamp ores. The maximum temperature in the furnace is about 1, 200°C and antimony trioxide volatilizes from the furnace and is caught by coolers and bag house. Gold ane silver remain in the scoria. The antimony oxide is reduced to metallic state in a reverberatory furnace and is again oxidized in a converter. By this oxidation more than 90% of lead in the antimony will be removed. The imported high grade antimony ore is directly oxidized in a converter and then is reduced in a reverberatory furnace.
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