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The wet-process for phosphoric acid production
Thesis (PhD (Chemistry))--University of Pretoria, 1998.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2022
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| _version_ | 1867613600103792640 |
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| access_status_str | Open Access |
| author2 | Heyns, A.M. |
| author_browse | Heyns, A.M. |
| author_facet | Heyns, A.M. |
| collection | Thesis |
| dc_rights_str_mv | © 2021 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Thesis (PhD (Chemistry))--University of Pretoria, 1998. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/83251 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:38:42.927Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/83251 The wet-process for phosphoric acid production Heyns, A.M. Kruger, Annalize UCTD Wet-process phosphoric acid production Thesis (PhD (Chemistry))--University of Pretoria, 1998. Project Purephos was initiated by Foskor, to investigate some aspects of the phosphoric acid industry, in particular, the effect of impurities in phosphate rock, commonly found by their clients, on the crystallisation of calcium sulphate dihydrate and the produced phosphoric add. The saturation and supersaturation curve for Palfos 88P rock was determined. This will assist producers to optimise, and understand the impact of the free sulphate level on the crystallisation of calcium sulphate dihydrate, and the co-precipitation, and thus loss, of P20s. The influence of sodium, potassium, magnesium and the aluminium/fluoride ratio were investigated. It was found that although sodium and potassium promote crystal growth, the filtration rates could decrease with elevated levels, as a result of the precipitation of hexafluorosilicates. Elevated levels of magnesium and aluminium increase acid viscosity and thus reduce filtration rates. The effect of aluminium can however be reduced, by controlling the aluminium/fluoride ratio. This study attempts to readdress the misconception that igneous rock is more difficult to process, and show that by using high-grade igneous rock, under controlled conditions, the benefits of igneous rock can be enjoyed. Chemistry PhD (Chemistry) Unrestricted 2022-01-12T06:00:52Z 2022-01-12T06:00:52Z 19/8/2021 1998 Thesis * http://hdl.handle.net/2263/83251 en © 2021 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Wet-process phosphoric acid production The wet-process for phosphoric acid production |
| title | The wet-process for phosphoric acid production |
| title_full | The wet-process for phosphoric acid production |
| title_fullStr | The wet-process for phosphoric acid production |
| title_full_unstemmed | The wet-process for phosphoric acid production |
| title_short | The wet-process for phosphoric acid production |
| title_sort | wet process for phosphoric acid production |
| topic | UCTD Wet-process phosphoric acid production |
| url | http://hdl.handle.net/2263/83251 |