文献类型：期刊文献

英文题名：Cooling crystallization of aluminum sulfate in pure water

作者：Sun, Xiaoxue[1];Sun, Yuzhu[1];Yu, Jianguo[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2015

卷号：419

起止页码：94

外文期刊名：JOURNAL OF CRYSTAL GROWTH

收录：;EI(收录号：20151300697924);WOS:【SCI-EXPANDED(收录号:WOS:000352706500016)】；

基金：This work was financially supported by National High Technology Research and Development Program of China (863 Program, no. SS2011AA06A102), National Natural Science Foundation of China (no. 21306053), Key Project of Scientific Research Innovation of Shanghai Municipal Education Commission (no. 14ZZ063).

语种：英文

外文关键词：Crystal morphology; Industrial crystallization; Crystallization kinetics; Aluminum sulfate

摘要：This study investigated the cooling crystallization of aluminum sulfate to explore the basic data for the recovery of aluminum resources from coal spoil. First, the metastable zone width (MSZW) of aluminum sulfate was reported. A parallel synthesis platform (CrystaISCAN) was used to determine the solubility from 10 degrees C to 70 degrees C, and an automatic lab reactor (LabMax) equipped with focused beam reflectance measurement (FBRM) was adopted to determine the supersolubility. The effects of operating variables on MSZW were experimentally explored. Results show that the MSZW of aluminum sulfate decreases with increasing stirring speed, while it increases with increasing cooling rate. Second, the continuous crystallization kinetics of aluminum sulfate was investigated in a laboratory-scale mixed-suspension mixed-product removal (MSMPR) crystallizer at a steady state. Growth kinetics presented size-dependent growth rate, which was well fitted with the MJ3 model. Both the growth rate (G) and the total nucleation rate (B-TOT) were correlated in the power law kinetic expressions with good correlation coefficients. Third, aluminum sulfate products were modified by sodium dodecylbenzenesulfonate (SOBS). Crystals with large sizes and regular hexagonal plate morphologies were obtained. These crystals reveal that SOBS can inhibit crystal nucleation and promote crystal growth. (C) 2015 Elsevier B.V. All rights reserved.