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Cooling crystallization of aluminum sulfate in pure water modulated by sodium dodecylbenzenesulfonate
Author(s) -
Sun Xiaoxue,
Sun Yuzhu,
Yu Jianguo
Publication year - 2015
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201500116
Subject(s) - sodium dodecylbenzenesulfonate , crystallization , sodium sulfate , sodium , aluminium , sulfate , chemistry , materials science , chemical engineering , inorganic chemistry , pulmonary surfactant , metallurgy , organic chemistry , engineering
This study investigated the cooling crystallization of aluminum sulfate to explore the basic data for the recovery of aluminum resources from coal spoil. Cooling crystallization process of aluminum sulfate with sodium dodecylbenzenesulfonate (SDBS) was investigated experimentally. The effects of operating conditions, namely rotate speed and cooling rate on the crystal size (Median diameter, D 0.5 ) were studied. Based on single factor experimental results, the response surface method (RSM) with a Box–Behnken design (BBD) was used to determine the key operating conditions, from which a predictive equation was established to quantitatively describe the relationships of D 0.5 and there relative parameters. The optimum operating conditions for cooling crystallization of aluminum sulfate were as follows: rotate speed of 200–300 rpm, cooling rate of 4–5 °C /min and n (SDBS)/ n (Al 2 (SO 4 ) 3 ) of around 5E‐4. Molecular dynamics (MD) results reveal that SDBS decreases the diffusion coefficient ( D ) of Al 3+ molecules, which inhibits nucleation and promotes crystal growth.