Recovery of Boron from the Clay Waste of Boron Industry by Leaching

KIPÇAK İ., ÖZDEMİR M.

INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING, cilt.10, 2012 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 10
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1515/1542-6580.2468
  • Dergi Adı: INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: boron recovery, leaching kinetics, sulfuric acid, clay waste, boric acid, BORAX SLUDGE, WATER
  • Eskişehir Osmangazi Üniversitesi Adresli: Evet

Özet

In this study, the recovery of boron from the clay waste of boron industry by leaching with sulfuric acid solution was studied in a batch reactor and the subsequent production of boric acid (H3BO3) was investigated. The effects of acid concentration, solid-to-liquid ratio and reaction temperature on the leaching process were examined. Experimental studies were carried out in the ranges of 0.1-1.0 M for acid concentration, 1-10 g/120 mL for solid-to-liquid ratio and 25-75 degrees C for reaction temperature. The analysis of the experimental data showed that the kinetics of the leaching process fitted the Avrami model in the form of X = 1 -exp (-k t (n)). For the production of boric acid, the optimum leaching conditions were determined as follows: acid concentration, 0.1 M; solid-to-liquid ratio, 6 g/120 mL; reaction temperature, 50 degrees C and reaction time, 60 min. Finally, boric acid was produced in the purity of more than 95% by crystallization of the leach solution.