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Precipitates of zirconium from carbonate solutions

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dc.contributor.advisor Rohwer HE, Prof en
dc.contributor.author Schmidt H en
dc.date.accessioned 2016-09-22T13:19:01Z
dc.date.available 2016-09-22T13:19:01Z
dc.date.submitted 1993 en
dc.identifier.uri http://hdl.handle.net/20.500.11892/157469
dc.description.abstract One of the essential zirconium chemicals consumed in industry today is basic zirconium carbonate; basic zirconium carbonate is most suitable as a precursor salt for the preparation of a wide variety of other zirconium chemicals. Consequently, knowledge of the factors that influence the physical and chemical properties of the basic carbonate is of great importance to all manufacturers of basic zirconium carbonates. This study was initiated as a result of the confusion revealed in the literature regarding the reactions involving zirconium(IV) in carbonate media and the actual composition of the basic precipitates formed by zirconium in these carbonate media. <br><br> Zirconium was precipitated from carbonate solutions under various conditions, i.e. with respect to the pH, reagent concentrations and sizes of the countercation present in solution. The effect of the presence of various non- aqueous solvents on the precipitating products was also investigated. <br><br> Attempts were made to characterize the different carbonate precipitates by means of infrared spectroscopy, carbon-hydrogen-nitrogen elemental analysis and thermogravimetric analysis. However, these analytical procedures alone proved to be insufficient to unambiguously characterize the precipitates and it was evident that in addition an exact analysis for the zirconium content of the precipitates was essential. <br><br> After careful consideration, the photometric determination of zirconium using a chromogenic reagent, arsenazo III, was chosen to be most practical. Discrepancies in the literature regarding the interaction between zirconium and arsenazo III, e.g. the stoichiometry of the zirconium-arsenazo III complex, were investigated, and after determining a suitable reaction medium and metakreagent ratio for the reaction medium, a procedure for analysing zirconium with the aid of a calibration curve was suggested. The zirconium content of the carbonate precipitates was determined and these results were then employed in a further attempt to characterize the zirconium carbonates. en
dc.language English en
dc.title Precipitates of zirconium from carbonate solutions en
dc.type Masters degree en
dc.description.degree MSc en

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