Akademik Veri Yönetim Sistemi
ENVIRONMENTAL PROGRESS, cilt.26, sa.2, ss.157-163, 2007 (SCI-Expanded)
To recover boron from borax sludge, initially solid-liquid extraction with dilute su ulfuric acid was utilized in a batch reactor. The optimum working conditions for boron extraction were determined. A maximum extraction yield of 85.0% for boron was obtained. In the process, 9.14% of the calcium and 16.8%, of the magnesium contained in the solid waste passed to the extraction solution. Subsequently, batch ion-exchange studies were performed using Amberlite IRA- 743-boron specific resin 7 for the separation of boron from the calcium and magnesium components in the exo-action solution. The effects of contact time and resin dosage on the ion-exchange process were investigated. A second order kinetic model seemed to be appropriate for the boron ion-exchange. The boron, which was sorbed on the resin. was eluted completely using a 0.5 M sulfuric acid solution. It was seen that the calcium and magnesium components were not present in the elution solution. In this process. boron was succesfully separated from the calcium and magnesium species. It was determined that approximately 98-70% of the boron in the extraction solution could be recovered at a pH value of 8. a contact time of 24 h, an initial boron concentration of 500 mg/L a resin dosage of 2.5 g of resin/50 mL of extraction solution and a temperature of 25 degrees C. (C) 2007 American institute of Chemical Engineers Environ Prog, 26: 157-163, 2007.