Production of Boric Acid from Microwave-Dehydrated Ulexite Waste by Oxalic Acid Solution Leaching

Abstract An investigation was made of the production of boric acid from microwave-dehydrated ulexite waste by leaching with oxalic acid solution. An ulexite waste sample was dehydrated in a domestic microwave oven, and then dissolved in oxalic solution at temperatures of between 25 and 70°C. The experimental data from this dissolution process were analyzed using homogeneous and heterogeneous kinetic models, and the leaching kinetics of the microwave-dehydrated ulexite waste were defined. The activation energy of the oxalic acid solution of the microwave-dehydrated ulexite waste was also calculated. Öz Mikrodalga ile dehirate edilmiş uleksit atığından borik asidin oksalik asit çözeltisi liç yoluyla üretilmesi incelenmiştir. Üleksit atık numunesi, ev tipi bir mikrodalga fırında dehidrate edilmiştir. Mikrodalga ile dehirate edilmiş uleksit atığı, oksalik çözeltilerde 25 ila 70 °C arasındaki bir sıcaklıkta çözülmüştür. Bu çözünme işleminin deneysel verileri homojen ve heterojen kinetik modeller kullanılarak analiz edilmiş ve mikrodalga-dehidre edilmiş uleksit atığının çözünme kinetiği belirlenmiştir. Mikrodalga-dehidre edilmiş uleksit atığının oksalik asit çözeltisinin aktivasyon enerjisi de hesaplanmıştır.

Keywords:

Boric acid, microwave-dehydrated ulexite waste dissolution, leaching kinetics,

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