On-line monitoring of lithium carbonate dissolution

✍ Scribed by Yuzhu Sun; Xingfu Song; Jin Wang; Yan Luo; Jianguo Yu

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 268 KB
• Volume: 44
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.200900402

✦ Synopsis

Abstract

Dissolution of lithium carbonate (Li~2~CO~3~) in aqueous solution was investigated using three on‐line apparatuses: the concentration of Li~2~CO~3~ was measured by electrical conductivity equipment; CLD (Chord Length Distribution) was monitored by FBRM (Focused Beam Reflectance Measurement); crystal image was observed by PVM (Particle Video Microscope). Results show dissolution rate goes up with a decrease of particle size, and with an increase in temperature; stirring speed causes little impact on dissolution; ultrasound facilitates dissolution obviously. The CLD evolution and crystal images of Li~2~CO~3~ powders in stirred fluid were observed detailedly by FBRM and PVM during dissolution. Experimental data were fitted to Avrami model, through which the activation energy was found to be 34.35 kJ/mol. PBE (Population Balance Equation) and moment transform were introduced to calculate dissolution kinetics, obtaining correlation equations of particle size decreasing rate as a function of temperature and undersaturation. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)