Author(s):
1. Duško Kostić, Faculty of Technology - University of East Sarajevo, Republic of Srpska, Bosnia and Herzegovina
2. Vladimir Damjanović, Fabrika , Republic of Srpska, Bosnia and Herzegovina
3. Mitar Perušić, Faculty of Technology - University of East Sarajevo, Republic of Srpska, Bosnia and Herzegovina
4. Radislav Filipovic, Faculty of Technology - University of East Sarajevo, Republic of Srpska, Bosnia and Herzegovina
5. Zoran Obrenovic, Faculty of Technology - University of East Sarajevo, Republic of Srpska, Bosnia and Herzegovina
6. Vladan Mićić, Faculty of Technology - University of East Sarajevo, Republic of Srpska, Bosnia and Herzegovina
7. Dragana Kostić, Faculty of Technology - University of East Sarajevo, Republic of Srpska, Bosnia and Herzegovina

Abstract:
The Bayer process represents the most significant and widespread process of aluminum production. The alumina produced by this process is most commonly used for the production of metallic aluminum, and can also be used as a catalyst, filler, abrasive and as a raw material for the production of many other compounds. The most important and significant aluminum ore is bauxite. Bauxite is a mixture of compounds of which aluminum and iron are the most important. By digesting bauxite using sodium hydroxide, sodium aluminate is produced at high temperatures and pressures, in which besides aluminum and sodium there are various impurities. The impurities adversely affect the stability of the aluminate solution and its properties, and later the quality of the product itself (alumina). These impurities, are bound to the crystal lattice of aluminum hydroxide, which results in a change in its properties as well as a decrease in its value. In order to avoid the harmful effects of impurities, certain processes must be used or their value reduced below the limit which is allowed. One of these methods is to treat the aluminate solution with the seed crystal at a specific temperature, concentration of the seed and the time of treatment. The focus of this paper is to monitor the above parameters (t, c, tau) in order to remove the impurities of iron, zinc and copper in sodium aluminate.

Thematic field:
SYMPOSIUM A - Science of matter, condensed matter and physics of solid states

Date of abstract submission:
11.06.2020.

Conference:
Contemporary Materials 2020 - Savremeni materijali

Final paper