Study on the Effect of Si and Silicide on Leaching Al(2)O(3) from Magnesium Smelting Reduction Slag

The main phases of the reduction slag from magnesium production by vacuum aluminothermic reduction using dolomite and magnesite as materials and using Al-Si alloy as reductant are CaO upsilon .Al(2)O(3) and 2CaO upsilon .SiO(2). It also has amount of unreacted Si. The Al(2)O(3) content of reduction...

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Bibliographic Details
Published in:AIP conference proceedings 2012-03
Main Authors: You, Jing, Wang, Yaowu, Feng, Naixiang, Peng, Jianping, Di, Yuezhong
Format: Article
Language:English
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Summary:The main phases of the reduction slag from magnesium production by vacuum aluminothermic reduction using dolomite and magnesite as materials and using Al-Si alloy as reductant are CaO upsilon .Al(2)O(3) and 2CaO upsilon .SiO(2). It also has amount of unreacted Si. The Al(2)O(3) content of reduction slag is about 60% and SiO(2) is about 10%. When leaching Al(2)O(3) with a mixture solution of sodium hydroxide and sodium carbonate, Si and SiO(2) would enter into leaching solution and has a negative effect on Al(2)O(3) leaching. The effect of Si and silicide on leaching Al(2)O(3) from magnesium smelting reduction slag was studied in laboratory. The results show that total Si and partial SiO(2) would enter into leaching solution and react with NaAl(OH)(4) to form (Na(2)O upsilon .Al(2)O(3) upsilon .SiO(2))6 upsilon .27H(2)O which is present in leaching residue and makes a loss of Al(2)O(3).
ISSN:0094-243X