Activity coefficient calculation model for NaAl(OH)4-NaOH-H2O system

ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 15 No. 4 August 2005

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Activity coefficient calculation model for
NaAl(OH)₄-NaOH-H₂O system

LI Xiao-bin(李小斌), LÜ Wei-jun(吕卫君), LIU Gui-hua(刘桂华),
PENG Zhi-hong(彭志宏), ZHOU Qiu-sheng(周秋生),
MENG Yun(孟芸), REN Wan-neng(任万能)

(School of Metallurgical Science and Engineering, Central South University,
Changsha 410083, China)

Abstract: Resorting to Debye-Hückel equation, the conception of the apparent dielectric constant ε′ of sodium aluminate solution is introduced. By supposing that all the influences are attributed to it, ε′ is successfully related to caustic ratio α_K, concentration m_{NaOH, T} and temperature T. Then an activity coefficient calculation model for NaAl(OH)₄-NaOH-H₂O system from 25℃ to 100℃ is established, which can be used in much wider α_K and m_{NaOH, T} ranges than those covered by the equilibrium solubility data.

Key words: Debye-Hückel equation; activity coefficient; calculation model

Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
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