The main objective of this investigation was to study and improve the precipitation characteristics of Ni(OH)2 in a sulphate system at various temperatures and pHs. Solubility tests were performed by dissolving crystalline Ni(OH)2 at constant pH and temperature for various test conditions. These results were then utilised to design alternative precipitation strategies with the objective of producing clean and easily filterable nickel hydroxide. Homogeneous Ni(OH)2 precipitation was performed using NaOH solution and MgO slurry at various temperatures and pHs in pure and impure aqueous systems. Ni(OH)2 was also produced by using controlled supersaturation technique in order to improve product quality. The use of supersaturation control improved particle morphology, crystallinity, settling rates and % solids density; however, sulphate and magnesium uptake was not eliminated by this precipitation technique.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.80144 |
| Date | January 2004 |
| Creators | Sist, Cinziana |
| Contributors | Demopoulos, G. P. (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: 002150032, proquestno: AAIMQ98567, Theses scanned by UMI/ProQuest. |
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