2012•Chinese Rare EarthsRequires access
Study on Removal of Aluminum and Extraction of Scandia from Shanxi Bayer Process Red Mud
Chen Jin
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Abstract
The aluminum-removing and technology of Sc2O3 extraction from Bayer process red mud have been studied in this paper.The red mud was sintered with suitable amount of Na2CO3 and CaO at 1080 ℃ for 40 minutes,then leached with alkaline liquor and washed with water,and the content of aluminum oxide in the red mud decreased by 78.73%.The resulting red mud was leached with 6.5 mol/L hydrochloric acid at 60 ℃ for 1.5 h.The extraction and separation of Sc was carried out with 2% P507 and sulphonating kerosene and estraction yield of Sc was 90.60%.Scandia with purity of 95.20% was obtained by stripping with 2 mol/L NaOH,precipitation with oxalic acid and roasting at 800 ℃ for 1 h.