Investigation of Bi2S3 oxidation process at elevated temperatures in the air atmosphere

• Main Authors: Štrbac Nada D., Sokić Miroslav D., Mitovski Aleksandra M., Gurešić Dejan M., Božinović Kristina N., Stojanović Jovica N., Tomović Milica P.
• Format: Article
• Language: English
• Published: Savez inženjera i tehničara Srbije 2020-01-01
• Series: Tehnika
• Subjects: bismuth (iii) sulfide; thermal analysis; oxidation; non-isothermal kinetics
• Online Access: https://scindeks-clanci.ceon.rs/data/pdf/0040-2176/2020/0040-21762005587Q.pdf

Bismuth (III) sulfide has been widely researched in recent years due to its application, but little emphasis has been placed on research regarding its behavior at elevated temperatures. This is of great importance, considering that bismuth, in the form of Bi2S3, is found in copper sulfide concentrates and is considered one of the most harmful components, along with lead, arsenic and antimony. The removal of these substances is one of the basic tasks in the processes of pyrometallurgical extraction of copper, in order to obtain a high purity metal. In order to better understand the behavior of bismuth (III) sulfide during oxidation at elevated temperatures, this paper characterized the synthesized sample of Bi2S3 at room temperature and the oxidation products at 500 °C by X-Ray diffraction (XRD), as well as thermodynamic, thermal and kinetic analysis of the oxidation process of Bi2S3 at elevated temperatures. In order to understand the behavior of Bi2S3 during oxidation and the distribution of oxidation products, phase stability diagrams in the Bi-S-O system were constructed at different temperatures and the values of the Gibbs free energy change at 400 °C and 1000 °C were calculated. Kinetic analysis of Bi2S3 oxidation process was performed by Kissingers method in non-isothermal conditions.