Akademik Veri Yönetim Sistemi
Aktaş S. (Yürütücü)
Yükseköğretim Kurumları Destekli Proje, 2015 - 2017
In this work, we investigated chromium extraction using a pyrometallurgical process and the subsequent production of nano-sized chromium oxide from Turkish chromite concentrate by assessing the effects of the base
amount, fusion temperature, and fusion time on the chromium conversion. Nano-sized chromium oxide
(Cr2O3) can be employed in many applications, such as catalysis, wear resistant materials, and advanced colorants, etc. To convert Cr(III) to Cr(VI) in the form of potassium chromate, potassium hydroxide (KOH) was
employed under air flowing at a rate of 20.0 L/min. The kinetics of conversion from Cr(III) to Cr(VI) were also explored. Dissolution of the resulting potassium chromate in distilled water and pH neutralization afforded precipitation of aluminum hydroxide, which could be removed by filtration. The Cr(VI) in solution was subsequently
converted to Cr(III) using sodium borohydride. The resulting chromium hydroxide was converted to nanosized chromium oxide by heating at ambient pressure and temperatures between 1073 K and 1473 K. Heating
to lower temperatures was found to be associated with a smaller particle size.