Influence of Process Parameters in Three-Stage Purification of Aluminate Solution and Aluminum Hydroxide
The influence of process parameters in the three-stage purification of aluminate solution from the Bayer process and aluminum hydroxide was considered in this paper. One of the ways of purification is treating the aluminate solution in order to reduce the concentrations in the starting raw material...
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MDPI AG
2023-10-01
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| author | Vladimir Damjanovic Radislav Filipovic Zoran Obrenovic Mitar Perusic Dusko Kostic Slavko Smiljanic Srecko Stopic |
| author_facet | Vladimir Damjanovic Radislav Filipovic Zoran Obrenovic Mitar Perusic Dusko Kostic Slavko Smiljanic Srecko Stopic |
| author_sort | Vladimir Damjanovic |
| collection | DOAJ |
| description | The influence of process parameters in the three-stage purification of aluminate solution from the Bayer process and aluminum hydroxide was considered in this paper. One of the ways of purification is treating the aluminate solution in order to reduce the concentrations in the starting raw material (solution) and then treating the aluminum hydroxide at a certain temperature and time in order to obtain an alumina precursor of adequate quality. The purification process itself is divided into three phases. The first phase involves the treatment of sodium aluminate with lime in order to primarily remove Ca<sup>2+</sup> and (SiO<sub>3</sub>)<sup>2−</sup> impurities. Phase II aims to remove impurities of Zn<sup>2+</sup>, Fe<sup>2+</sup>, and Cu<sup>2+</sup> by treatment with controlled precipitation using specially prepared crystallization centers. In Phase III, Na<sup>+</sup> is removed by the process of hydrothermal washing of Al<sub>2</sub>O<sub>3</sub> ∙ 3H<sub>2</sub>O. In this work, parameters such as temperature (T), reaction time (t), and concentration of lime (c) were studied in order to remove the mentioned impurities and obtain the purest possible product that would be an adequate precursor for special types of alumina. |
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| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T16:37:15Z |
| publishDate | 2023-10-01 |
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| spelling | doaj.art-79eda5b975c1490cb7fc38db3b183a8f2023-11-24T14:55:42ZengMDPI AGMetals2075-47012023-10-011311181610.3390/met13111816Influence of Process Parameters in Three-Stage Purification of Aluminate Solution and Aluminum HydroxideVladimir Damjanovic0Radislav Filipovic1Zoran Obrenovic2Mitar Perusic3Dusko Kostic4Slavko Smiljanic5Srecko Stopic6Alumina d.o.o., Karakaj, 75400 Zvornik, Bosnia and HerzegovinaAlumina d.o.o., Karakaj, 75400 Zvornik, Bosnia and HerzegovinaAlumina d.o.o., Karakaj, 75400 Zvornik, Bosnia and HerzegovinaFaculty of Technology, University of East Sarajevo, Karakaj 34 A, 75400 Zvornik, Bosnia and HerzegovinaFaculty of Technology, University of East Sarajevo, Karakaj 34 A, 75400 Zvornik, Bosnia and HerzegovinaFaculty of Technology, University of East Sarajevo, Karakaj 34 A, 75400 Zvornik, Bosnia and HerzegovinaIME Process Metallurgy and Metal Recycling, RWTH Aachen University, Intzestrasse 3, 52056 Aachen, GermanyThe influence of process parameters in the three-stage purification of aluminate solution from the Bayer process and aluminum hydroxide was considered in this paper. One of the ways of purification is treating the aluminate solution in order to reduce the concentrations in the starting raw material (solution) and then treating the aluminum hydroxide at a certain temperature and time in order to obtain an alumina precursor of adequate quality. The purification process itself is divided into three phases. The first phase involves the treatment of sodium aluminate with lime in order to primarily remove Ca<sup>2+</sup> and (SiO<sub>3</sub>)<sup>2−</sup> impurities. Phase II aims to remove impurities of Zn<sup>2+</sup>, Fe<sup>2+</sup>, and Cu<sup>2+</sup> by treatment with controlled precipitation using specially prepared crystallization centers. In Phase III, Na<sup>+</sup> is removed by the process of hydrothermal washing of Al<sub>2</sub>O<sub>3</sub> ∙ 3H<sub>2</sub>O. In this work, parameters such as temperature (T), reaction time (t), and concentration of lime (c) were studied in order to remove the mentioned impurities and obtain the purest possible product that would be an adequate precursor for special types of alumina.https://www.mdpi.com/2075-4701/13/11/1816Bayer processsodium aluminatealuminahydrothermal processaluminum hydroxide |
| spellingShingle | Vladimir Damjanovic Radislav Filipovic Zoran Obrenovic Mitar Perusic Dusko Kostic Slavko Smiljanic Srecko Stopic Influence of Process Parameters in Three-Stage Purification of Aluminate Solution and Aluminum Hydroxide Metals Bayer process sodium aluminate alumina hydrothermal process aluminum hydroxide |
| title | Influence of Process Parameters in Three-Stage Purification of Aluminate Solution and Aluminum Hydroxide |
| title_full | Influence of Process Parameters in Three-Stage Purification of Aluminate Solution and Aluminum Hydroxide |
| title_fullStr | Influence of Process Parameters in Three-Stage Purification of Aluminate Solution and Aluminum Hydroxide |
| title_full_unstemmed | Influence of Process Parameters in Three-Stage Purification of Aluminate Solution and Aluminum Hydroxide |
| title_short | Influence of Process Parameters in Three-Stage Purification of Aluminate Solution and Aluminum Hydroxide |
| title_sort | influence of process parameters in three stage purification of aluminate solution and aluminum hydroxide |
| topic | Bayer process sodium aluminate alumina hydrothermal process aluminum hydroxide |
| url | https://www.mdpi.com/2075-4701/13/11/1816 |
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