The digestion (dehydration and dissolving), in a molten salt containing MgCl2, of partially hydrated MgCl2 in the form of 'prills' was visually observed. The 'prills' were prepared by Magnola Metallurgie Inc. Pictures of the digestion are presented and two types of bubbling behaviours were observed. / It was concluded that the digestion process occurred in two steps: (1) dehydration/hydrolysis of prills in the solid state and (2) dissolution of the dehydrated products. Each step was accompanied by a distinctive bubbling behaviour as the gas products of the step were evolved. / The type of bubbling behaviour associated with the first step was termed 'Primary Bubbling' and was due to the release of the waters of hydration, hereinafter termed dehydration. The second type of bubbling behaviour observed was termed 'Secondary Bubbling' and was due to the decomposition of dissolved oxide in the molten salt according to the reaction: MgOHCldiss→MgOs+HCl g / The solubility of the dissolved oxide was seen to be a function of temperature and MgCl2 activity in the melt. Analysis of the gas evolved during Secondary Bubbling revealed a gas composition of about 51 vol.% HCl and 49 vol.% H2O, indicating that dissolved oxide was also being chlorinated by the reaction: MgOHCldiss →MgCl2l+HO g / Injection of Ar decomposed the dissolved oxide by offsetting the first reaction above to the left and injection of HCl chlorinated solid MgO by the reaction: MgOs+2H Clg→MgCl2l +H2Og / Surprisingly, it was found the HCl atmosphere in the freeboard of the reactor had no significant effect to suppress the hydrolysis reaction occurring during dehydration.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.80116 |
| Date | January 2004 |
| Creators | Kreuh, Matthew |
| Contributors | Harris, Ralph (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Engineering (Department of Mining, Metals and Materials Engineering.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 002094752, proquestno: AAIMQ98539, Theses scanned by UMI/ProQuest. |
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