THE DIGESTION OPERATION IN THE ALKALI ALUMINAT SOLUTIONS OF ALUMINUM HYDROXIDES IN THE BOEHMITIC BAUXITES
At present more than 90 per cent of the world's alumina is produced by the Bayer process, a simple technology providing high purity final product. A part from some exceptional local conditions, bauxite is processed almost solely by this technology. As a benefication process, alumina production...
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ftdoajarticles:oai:doaj.org/article:dea227d282b44be795a6c5c742aeb3fa 2023-05-15T15:52:49+02:00 THE DIGESTION OPERATION IN THE ALKALI ALUMINAT SOLUTIONS OF ALUMINUM HYDROXIDES IN THE BOEHMITIC BAUXITES Sami ŞAHİN 1999-01-01T00:00:00Z https://doaj.org/article/dea227d282b44be795a6c5c742aeb3fa EN TR eng tur Pamukkale University http://dergipark.ulakbim.gov.tr/pajes/article/view/5000089953 https://doaj.org/toc/1300-7009 https://doaj.org/toc/2147-5881 1300-7009 2147-5881 https://doaj.org/article/dea227d282b44be795a6c5c742aeb3fa Pamukkale University Journal of Engineering Sciences, Vol 5, Iss 1, Pp 987-992 (1999) Böhmitik Boksit Alkali Sodyum oksit Aluminyum hidroksit Engineering (General). Civil engineering (General) TA1-2040 article 1999 ftdoajarticles 2023-02-19T01:37:08Z At present more than 90 per cent of the world's alumina is produced by the Bayer process, a simple technology providing high purity final product. A part from some exceptional local conditions, bauxite is processed almost solely by this technology. As a benefication process, alumina production releases the aluminum oxide content of bauxite from other accompanying oxides thus providing alumina suitable for electrolysis in a cryolite melt. The basic theory of the Bayer process was elaborated by K.J. Bayer and described in his patents in 1887 and 1892. The first patent refers to the aid of seed crystals of aluminum hydroxide or of carbonic acid, that is, to the precipitation and carbonation processes. The second patent formulates the concept that the aluminum oxide content of bauxites can be dissolved in sodium hydroxide solutions, with the formulation of sodium aluminate, a process called digestion nowadays. The most important operations of the Bayer technology are bauxite preparation, crushing, grinding, digestion, red mud separation, thickening, washing, filtration, precipitation, calcination and evaporation. In spite of its great significance as regards the complete Bayer technology, the structure of sodium aluminate solutions has not been cleared up definitely yet. Boehmite is the most important aluminum mineral of karstic bauxites. Some experimental results showing the various effects on aluminum hydroxides by alkali process from boehmitic bauxites and the factors gowerning the digestion operation of aluminate solutions were investigated. Article in Journal/Newspaper Carbonic acid Directory of Open Access Journals: DOAJ Articles |
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Directory of Open Access Journals: DOAJ Articles |
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language |
English Turkish |
topic |
Böhmitik Boksit Alkali Sodyum oksit Aluminyum hidroksit Engineering (General). Civil engineering (General) TA1-2040 |
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Böhmitik Boksit Alkali Sodyum oksit Aluminyum hidroksit Engineering (General). Civil engineering (General) TA1-2040 Sami ŞAHİN THE DIGESTION OPERATION IN THE ALKALI ALUMINAT SOLUTIONS OF ALUMINUM HYDROXIDES IN THE BOEHMITIC BAUXITES |
topic_facet |
Böhmitik Boksit Alkali Sodyum oksit Aluminyum hidroksit Engineering (General). Civil engineering (General) TA1-2040 |
description |
At present more than 90 per cent of the world's alumina is produced by the Bayer process, a simple technology providing high purity final product. A part from some exceptional local conditions, bauxite is processed almost solely by this technology. As a benefication process, alumina production releases the aluminum oxide content of bauxite from other accompanying oxides thus providing alumina suitable for electrolysis in a cryolite melt. The basic theory of the Bayer process was elaborated by K.J. Bayer and described in his patents in 1887 and 1892. The first patent refers to the aid of seed crystals of aluminum hydroxide or of carbonic acid, that is, to the precipitation and carbonation processes. The second patent formulates the concept that the aluminum oxide content of bauxites can be dissolved in sodium hydroxide solutions, with the formulation of sodium aluminate, a process called digestion nowadays. The most important operations of the Bayer technology are bauxite preparation, crushing, grinding, digestion, red mud separation, thickening, washing, filtration, precipitation, calcination and evaporation. In spite of its great significance as regards the complete Bayer technology, the structure of sodium aluminate solutions has not been cleared up definitely yet. Boehmite is the most important aluminum mineral of karstic bauxites. Some experimental results showing the various effects on aluminum hydroxides by alkali process from boehmitic bauxites and the factors gowerning the digestion operation of aluminate solutions were investigated. |
format |
Article in Journal/Newspaper |
author |
Sami ŞAHİN |
author_facet |
Sami ŞAHİN |
author_sort |
Sami ŞAHİN |
title |
THE DIGESTION OPERATION IN THE ALKALI ALUMINAT SOLUTIONS OF ALUMINUM HYDROXIDES IN THE BOEHMITIC BAUXITES |
title_short |
THE DIGESTION OPERATION IN THE ALKALI ALUMINAT SOLUTIONS OF ALUMINUM HYDROXIDES IN THE BOEHMITIC BAUXITES |
title_full |
THE DIGESTION OPERATION IN THE ALKALI ALUMINAT SOLUTIONS OF ALUMINUM HYDROXIDES IN THE BOEHMITIC BAUXITES |
title_fullStr |
THE DIGESTION OPERATION IN THE ALKALI ALUMINAT SOLUTIONS OF ALUMINUM HYDROXIDES IN THE BOEHMITIC BAUXITES |
title_full_unstemmed |
THE DIGESTION OPERATION IN THE ALKALI ALUMINAT SOLUTIONS OF ALUMINUM HYDROXIDES IN THE BOEHMITIC BAUXITES |
title_sort |
digestion operation in the alkali aluminat solutions of aluminum hydroxides in the boehmitic bauxites |
publisher |
Pamukkale University |
publishDate |
1999 |
url |
https://doaj.org/article/dea227d282b44be795a6c5c742aeb3fa |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
Pamukkale University Journal of Engineering Sciences, Vol 5, Iss 1, Pp 987-992 (1999) |
op_relation |
http://dergipark.ulakbim.gov.tr/pajes/article/view/5000089953 https://doaj.org/toc/1300-7009 https://doaj.org/toc/2147-5881 1300-7009 2147-5881 https://doaj.org/article/dea227d282b44be795a6c5c742aeb3fa |
_version_ |
1766387927524311040 |