Leaching Kinetics of Tincal in Ammonium Chloride Solutions

The effects of reaction temperature, solution concentration, solid to liquid ratio, particle size and stirring speed were investigated on leaching kinetics of tincal, sodium tetraborate decahydrate(Na2B4O7 center dot 10H(2)O), in ammonium chloride solutions. The results showed that the dissolution rate increased with increasing solution concentration and reaction temperature, and increased with decreasing particle size and solid to liquid ratio. It was also determined that stirring speed had no significant effect on dissolution rate. The dissolution process was examined according to homogeneous and heterogeneous reaction kinetic Model. The dissolution rate was found to be based on the first order pseudo homogeneous reaction model. The activation energy of the dissolution of tincal in ammonium chloride solutions was determined to be 82.73 kJ . mol(-1).