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A mild hydro-chemical process to extract Al 2 O 3 in red mud to produce sodium aluminate hydrate was investigated, and the optimum conditions of Al 2 O 3 extraction were verified by experiments as leaching in 45% NaOH solution with CaO-to-red mud mass ratio of 0.25 and liquid-to-solid ratio of 0.9, under 0.8MPa at 200°C for 3.5h. Subsequent process of extracting Na...
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