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Recycling of metallurgical wastes including dust and sludge formed in cleaning of the effluent gas is one of the most urgent issues for metallurgical industries. These dusts contain valuable elements which, when recycled, decrease consumption of raw materials and more importantly, eliminate potentially harmful by-product stockpiles. The Tasmanian Electro Metallurgical Company (TEMCO), Australia, produces ferromanganese and silicomanganese alloys in submerged arc furnaces. Manganese ores are reduced by coke and coal in the furnaces. Electricity supplies the energy for smelting and reduction reactions. Manganese dust, which contains metal oxides, volatiles and tar, is collected from the furnace off-gas wet scrubbers and then is deposited in settling ponds. The water content of the manganese dust is close to 60 mass%. 1) Therefore, the dust needs to be dried before recycling. The manganese furnace dust contains up to 1.5 mass% of zinc (dry basis) 1) which has to be removed prior to recycling into the smelting furnaces to avoid irregular charge movement, and potential explosions, resulting from zinc accumulation. Reduction of zinc oxide in the manganese furnace dust with tar was studied in work, 2) which reported the effects of temperature and gas atmosphere. It was established that zinc oxide in the manganese furnace dust can be reduced and removed by tar under appropriate reducing conditions. The behaviour of zinc in pilot-plant sintering of manganese ore with addition of manganese furnace dust has also been examined. 3) The low degree of zinc removal was attributed to reoxidation of

Manganese Furnace Dust: Drying and Reduction of Zinc Oxide by Tar