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Development Projects for Solving the Red Mud Problem in the Aluminum Industry

机译：解决铝工业赤泥问题的发展项目

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In the production of alumina from bauxite large quantities of a moist residue--so called red mud--are separated. Deposition of this material represents an increasing problem. Within the scope of the sponsored project possibilities of utilization of red mud were studied. By making use of a pilot spray-drier erected for this purpose, a filler was developed from red mud and put on the market for use in bituminous road-construction and in plastics. 600,000 sq m road surface with 2,500 t red mud filler have been constructed. The basic know-how for the production of lightweight aggregates from the tailings of coal dressing by addition of red mud was worked out. By recovery of valuable caustic soda from red mud a residue of low alkaline content was produced. Bricks of this material can be used as prefabricated steel works slag.

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