Abstract
Sotetsu Metal Co., Ltd. and Nisso Metallochemical Co., Ltd. started operation of Waelz plant for treatment of steel making dust in 1975. At present Sotetsu Metal Co., Ltd. treat 50, 000 tons of dust and recovery 17, 000 tons of crude zinc oxide annually. Nisso Metallochemical Co., Ltd. product high grade zinc oxide of 12, 000 tons and lead cake of 150 tons for smelting from crude zinc oxide.
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