Dissolution kinetics of ulexite in aqueous EDTA solutions

Abstract

The dissolution kinetics of ulexite in aqueous disodium Ethylene Diamine Tetra Acidic Acid (EDTA) solutions has been investigated with respect to the effects of particle size, solution concentration, pH of solution, calcination temperature and reaction temperature. The rate of the reaction decreases as the particle size and pH of the solution increase, but the rate increases with an increase in both solution concentration and reaction temperature. The sample pre-heated at 140 degreesC has the highest dissolution rate. The rate of the dissolution can be expressed according to the unreacted shrinking core model with changing fluid phase concentration.