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utilized up till now, due to the negative impacts of sulfur [3-5] such as causing loss of caustic soda, degrading alumina product, corroding steel equipment and deteriorating red mud settling... Experimental 2.1 Materials Sodium aluminate solutions with a designated molar ratio (αk) of caustic soda to alumina were prepared by dissolving industrial grade aluminum hydroxide (Chalco) into sodium......
Preparation of soil nutrient amendment using white mud produced in ammonia-soda process and its environmental assessment SHI Lin(石 林), LUO Han-jin(罗汉金) College of Environmental Science...%-60% water, commonly known as "white mud", is discharged from the Ammonia-soda Process in quantity[1]. In 2000, 59% of soda ash was manufactured by this process in the world[2], and 52.5% of soda ash......
that in treating diasporic bauxite as the gibbsite can be rapidly digested and thus the caustic soda concentration decreases quickly in the initial stage. Furthermore, compared with the iron powder additive, some organic additives [23] are reasonable to decrease the red mud generation as they are soluble in the caustic soda solution. LI [24] reported that the addition of 20 g/L glucose together with 2......
Collections by Chinese Scholars Studying or ever Studied in Japan in 21 Century [C]. Beijing: Metallurgy Industry Publishing Company, 2000: 109-117. (in Chinese) [5] SODA H, MCLEAN A, SHEN J, XIA Q, MOTOYASU G, KOROTKIN M, YAN K. Development of net-shape cast aluminium-yttrium alloy wires and their solidification structures [J]. Journal of Materials Science, 1997, 32: 1841-1847. [6] SODA H, MCLEAN......
; 1 Introduction Red mud, which contains considerable amount of alumina, caustic soda, ferric oxide, titania and other minor valuable... as high pressure hydro-chemistry method is concerned, red mud is leached at high temperature (>260 ℃) and high alkalinity (molar ratio of Na2O to Al2O3>10) to recover caustic soda and alumina, where ferric......
with solutions of caustic soda or sodium carbonate at elevated temperatures and pressures to produce sodium tungstate [3-7]. Both methods, being widely applied on commercial scale, possessed a strong..., WANG Shi-bo, LI Hong-gui, LIU Mao-sheng. Extracting tungsten from scheelite concentrate with caustic soda by autoclaving process [J]. Hydrometallurgy, 2011, 108: 152-156. [4] ZHAO Zhong-wei, LIANG......
tension [7], viscosity [8], activity [9] in the solution and the structure of aluminate ion. Based on kinetic studies [10], various methods, such as varying the concentration of caustic soda or alumina... sodium aluminate solution with αk=1.41 (molar ratio of caustic soda (Na2O) to alumina (Al2O3) in sodium aluminate solution) was added into 1.5 L tank, heated to 55 °C and stirred at 150 r/min. AH......
, 2012, 27(2): 22-27. (in Chinese) [3] BECKSTEAD L W, HUGGINS D K, QUENEAU P B. Autoclave soda digestion of scheelite concentrates: US, 4351808 [P]. 1982-09-28. [4] ZHAO Zhong-wei, LI Hong-gui, LIU Mao-sheng, SUN Pei-mei, LI Yun-jiao. Soda decomposition of low-grade tungsten ore through mechanical activation [J]. Journal of Central South University, 1996, 3(2): 78-81. [5] ZHAO Zhong-wei, LI Jiang......