Treatment of Black Dross with Water and NaOH Solution
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Black dross contains metallic aluminium, alumina, silica, MgO, soluble salts together with minor ingredients. Control of silica in black dross is important in transforming the black dross into usable materials. First, most of the soluble salts (KCl and NaCl) in black dross were dissolved in water at reaction temperature of 50 o C. Leaching behavior of silica, alumina, MgO and TiO 2 from the residue after water treatment was investigated by varying NaOH concentration and reaction temperature. Reaction temperature (25~95 o C) was favorable to the leaching of alumina but an optimum temperature existed for silica. MgO was not dissolved at all in the NaOH concentration range from 2 to 6 M. At the leaching condition of 5 M NaOH and reaction temperature of 95 o C, approximately 80% of alumina and 68% of silica was dissolved.
Abstract
Black dross contains metallic aluminium, alumina, silica, MgO, soluble salts together with minor ingredients. Control of silica in black dross is important in transforming the black dross into usable materials. First, most of the soluble salts (KCl and NaCl) in black dross were dissolved in water at reaction temperature of 50 o C. Leaching behavior of silica, alumina, MgO and TiO 2 from the residue after water treatment was investigated by varying NaOH concentration and reaction temperature. Reaction temperature (25~95 o C) was favorable to the leaching of alumina but an optimum temperature existed for silica. MgO was not dissolved at all in the NaOH concentration range from 2 to 6 M. At the leaching condition of 5 M NaOH and reaction temperature of 95 o C, approximately 80% of alumina and 68% of silica was dissolved.
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