Leaching Kinetics of Bauxite in Hydrochloric Acid
| Autor: | D. H. Jenkins, H. N. Sinha |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Mechanical Engineering
Metallurgy chemistry.chemical_element Hydrochloric acid General Chemistry engineering.material Geotechnical Engineering and Engineering Geology Bayer process law.invention chemistry.chemical_compound Bauxite chemistry Aluminium law Sodalite engineering Economic Geology Calcination Leaching (metallurgy) Dissolution |
| Zdroj: | Mineral Processing and Extractive Metallurgy Review. 15:143-143 |
| ISSN: | 1547-7401 0882-7508 |
| DOI: | 10.1080/08827509508914168 |
| Popis: | The Bayer process is currently used to produce cell-grade alumina from bauxite. However, if the reactive silica content in the bauxite exceeds 7%, losses of caustic and aluminium as sodalite (2 Na20.2 Al2O3·3 SiO2·2 H2O) become economically unacceptable. As Australia possesses large tonnages of bauxite containing more than 7% reactive silica, a process for the production of cell-grade alumina horn these bauxites using hydrochloric acid leaching was developed by the authors. The process consists of the following steps: calcination of bauxite, leaching of calcined bauxite in hydrochloric acid, filtration of residue, crystallization of A1C13.6 H2O, decomposition of AlCl3.6 H2O crystals to produce A12O3, regeneration of hydrochloric acid for recycle into the leaching step. The kinetic studies of the dissolution showed that the extraction of aluminium is independent of the solid to leachant ratios studied. The acid concentration has a marked effect on leaching kinetics of bauxite and the leaching time decrease... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|