Full-Text Search:
Home|About CNKI|User Service|中文
Add to Favorite Get Latest Update

Technology conditions and mechanism discussion of sodium and iron extraction from red mud by acid

Chen Hongliang;Wang Ting;Ke Yang;Wang Shengbi;Guizhou Special and Key Laboratory of Material Science and Resource Chemistry,College of Chemistry and Chemical Engineering,Anshun University;  
The extraction rates of sodium and iron from red mud of Bayer process by H_2SO_4,CH_3 COOH,and H_2C_2O_4 were mainly discussed and analyzed comparatively.The results showed effect of H_2SO_4 on extraction rates of Na and Fe was dramatic.Na extraction rate was raised by increasing H_2SO_4 concentration and was 99.99% under the conditions of 20 ℃,1.8 mol/L H_2SO_4,and 30 min reaction time.Fe extraction rate,increase of which was induced by H_2SO_4 concentration and temperature,was 67.93 % at 2.8 mol/L H_2SO_4,50 ℃,and 45 min reaction time.The kinetics processes of Na and Fe extraction by H_2SO_4 followed the internal diffusion-controlled mode and the apparent activation energy of Fe extraction was determined to be37.50 k J/mol.Crystalline minerals after Na extraction were mainly CaSO_4·2H_2O,Fe_2O_3,Al(OH)_3,and TiO_2.Crystalline minerals after Fe extraction were CaSO_4·2H_2O and TiO_2.
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©CNKI All Rights Reserved