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Preparation of calcium sulfate whiskers using waste calcium chloride by reactive crystallization
Author(s) -
Song Xingfu,
Zhang Lina,
Zhao Jingcai,
Xu Yanxia,
Sun Ze,
Li Ping,
Yu Jianguo
Publication year - 2011
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.201000420
Subject(s) - whiskers , crystallization , sulfuric acid , calcium , chemical engineering , chemistry , raw material , chloride , materials science , inorganic chemistry , organic chemistry , composite material , engineering
Calcium sulfate whiskers, owing to its good thermal stability, chemical resistance and good compatibility with rubber and plastics, has a strong potential in the application of polymer reinforcing composite materials. This work deals with the preparation of calcium chloride whiskers by reactive crystallization process with sulfuric acid and calcium chloride discharged from Solvay process. Firstly, the orthogonal experiments were carried out using both CaCl 2 and H 2 SO 4 in analytic grade as feedstock, and the reactive crystallization conditions were optimized, which included reaction temperature, reactant concentration, reaction time and stirring speed. Based on the optimized reactive crystallization conditions, the new process for the preparation of calcium chloride whiskers was studied using the reactive crystallization process with sulfuric acid and calcium chloride discharged from Solvay process, and the effects of impurity ions in the waste solutions on the growth of whiskers were evaluated. It was found that calcium sulfate whiskers with stable and structured fine crystals (its aspect ratio up to 190) can be prepared using waste CaCl 2 in Solvay process. The experimental results will provide the valuable information for the reasonable disposal of waste CaCl 2 solution from Solvay process. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)