TY - JOUR ID - 37216 TI - The Conversion Kinetics of Tincal to Boric Acid in Nitric Acid Solutions JO - Iranian Journal of Chemistry and Chemical Engineering JA - IJCCE LA - en SN - 1021-9986 AU - Tunc, Mehmet AU - irem, Hasan AU - Kocakerim, M. Muhtar AU - Copur, Mehmet AU - Küçük, Özkan AD - Department of Chemistry, Yüzüncüyıl University, Van, TURKEY AD - Department of Chemical Engineering, Engineering Faculty, Çankırı Karatekin University, Çankırı, TURKEY AD - Department of Chemical Engineering, Engineering Faculty, Bursa Teknik University, Bursa, TURKEY AD - Department of Metallurgy and Material Engineering, Engineering Faculty, Bilecik Şeyh Edebali University, TURKEY Y1 - 2020 PY - 2020 VL - 39 IS - 2 SP - 83 EP - 90 KW - Borax KW - conversion kinetics KW - Nitric acid KW - boric acid DO - 10.30492/ijcce.2020.37216 N2 - Pure borax and various boron compounds are produced from the solutions in which tincal is dissolved with various reagents. Economically important boron compounds such as boric acid, borax, boric oxide, and refined hydrated sodium borates and perborates are produced from boron-containing ores. The production of boric acid by using nitric acid from tincal is more advantageous because it evaluates by-product NaNO3 as fertilizer production. In this study, the conversion kinetics of tincal to boric acid in nitric acid solutions were investigated by such parameters as particle size, 300-1500 µm; acid concentration,0.5-4 mol/L; solid-to-liquid ratio 0.04-0.10 g/mL; stirring speed 20.93-62.8  s-1, and reaction temperature, 30-60 oC. The conversion was found to increase with decreasing particle size and solid-to-liquid ratio and while it increased with increasing reaction temperature, acid concentration, and stirring speed. The conversion kinetics was examined using the heterogeneous and pseudo-homogeneous reaction models. The experimental results were found to be in better agreement with the correlation given in the following equation and the activation energy being 37.5 kJ/mol.   UR - https://ijcce.ac.ir/article_37216.html L1 - https://ijcce.ac.ir/article_37216_73eff37baf5e576805505e20bb6c126e.pdf ER -