Dissolution Kinetics of Ulexite in Borax Pentahydrate Solutions Saturated with Carbon Dioxide

Dissolution Kinetics of Ulexite in Borax Pentahydrate Solutions Saturated with Carbon Dioxide

Kuslu, Soner
Çavus, Feyza
Çolak, Sabri

The aim of the study was to investigate the dissolution kinetics of ulexite in borax pentahydrate solutions saturated with carbon dioxide in a mechanical agitation system. The effects of reaction temperature, stirring speed, CO2 flow rate, solid/liquid ratio and particle size on the rate of dissolution of ulexite were examined. It was observed that increase in the reaction temperature and decrease in the solid/liquid ratio causes an increase the dissolution rate of ulexite. The dissolution extent is not affected by the stirring speed rate in experimental conditions. The activation energy was found to be 58.7 kJ/mol. This value indicates the dissolution rate of ulexite is a chemically controlled reaction. The rate expression associated with the dissolution rate of ulexite depending on the parameters chosen may be summarized as: 1-(1-X) 1/3 = 7.4x105. D-0.8. (S/L)-0.6. W0.1. e (-58700 /R T).t

Conference or Workshop Item
PeerReviewed

2009-06

495