The recovery of boron from borax sludge was studied. initially, the solid-liquid extraction was applied to borax sludge in a batch reactor. Subsequently, the extraction solution was treated with the Amberlite IRA-743-boron specific resin for the separation of boron from the calcium and magnesium components in the extraction solution. in the batch studies, the effect of pH on the boron recovery was studied by adjusting the pH of extraction solution using HCl and NaOH solution. Optimum boron recovery of 44% was obtained at pH 8. The column studies were carried out using different inlet boron concentrations and flow rates at pH 8 and 25 degrees C Thomas and the Yoon-Nelson Models were found suitable to describe the dynamic behavior of the column and to determine the column kinetic parameters for process design. Almost all the boron, which was sorbed by the resin was eluted using a 0.5 M H2SO4 solution. It was seen that the concentrations of other species in the elution solution were insignificant so that it could not to be detected. In this process, boron was successfully separated from the calcium and magnesium species. It was determined that approximately 709,6 of the boron in the extraction solution could be recovered at an inlet boron concentration of 250 mg/L,, a flow rate of 2.5 mL/min, a pH value of 8 and a temperature of 25 degrees C. (c) 2007 American Institute of Chemical Engineers Environ Prog.