Proceedings of the Korea Association of Crystal Growth Conference (한국결정성장학회:학술대회논문집)
- 1997.10a
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- Pages.1-5
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- 1997
Crystallization of High Purity Ammonium Meta-Tungstate for production of Ultrapure Tungsten Metal
- Choi, Cheong-Song (Department of Chemical Engineering, Sogang University)
- Published : 1997.10.01
Abstract
The growth mechanism of AMT(Ammonium Meta-Tungstate) crystal was interpreted as two-step model. The contribution of the diffusion step increased with the increase of temperature, crystal size, and supersaturation. The crystal size distribution from a batch cooling crystallizer was predicted by the numerical solution of a mathematical model which uses the kinetics of nucleation and crystal growth. Temperature control of a batch crystallizer was studied using Learning control algorithm. The purity of AMT crystal producted in this investigation was above 99.99%.
Keywords