Abstract
The reduction slag from magnesium smelting by vacuum aluminothermic reduction using dolomite and magnesite as raw materials consists mainly of Al2O3 and CaO. The alumina is more than 67% of the slag and is mainly in the form of CaO • 2Al2O3. The process of producing aluminum hydroxide from the slag by leaching with a mixture of sodium hydroxide and sodium carbonate was studied. This showed that the leaching rate of alumina is more than 86% when leaching temperature is 95°C, and L/S is 5, and leaching time is 2h. The magnesia-alumina spinel which generated in the reduction process and 3CaO•Al2O3•6H2O which is generated in the leaching process, are the two main causes of loss of alumina. The chemical composition of aluminum hydroxide products obtained after carbonation precipitation can meet the quality standard of the alumina plant.
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