3215 Kinetic study of the reaction formation of phosphate products from the thermal dissolution of wolframite using fusion technique
DOI:
https://doi.org/10.17159/Abstract
This study examines an alternative technique of extracting tungsten from wolframite ore using fusion method with ammonium phosphate salt. Current techniques use alkali salts to decompose tungsten ores and various purification methods to produce of ammonium paratungstate (APT) which is a key intermediate precursor in the extraction of tungsten. In this study, a two-step extraction process which involves the thermal decomposition of the ore using fusion technique and a separation stage is examined. The novelty of this technique is the ability to completely decompose wolframite ore and to form an unstable tungsten oxide phosphate (WO2(PO3)2) compound. The in stability of WO2(PO3)2 compound in deionized enabled the selective isolation of tungsten as insoluble precipitates of WO3 and WO2. The decomposition reaction of WO2(PO3)2 was influenced by the presence of oxygen and was determined to be first order under ambient conditions. SEM images and XRD analysis showed higher proportion above 80 % of the precipitated tungsten compared to the remaining filtrate solution obtained after the decomposition reaction.
Downloads
Published
Issue
Section
License
Copyright (c) 2024 Lehlohonolo Sehai Mokhahlane
This work is licensed under a Creative Commons Attribution 4.0 International License.
THE INSTITUTE, AS A BODY, IS NOT RESPONSIBLE FOR THE STATEMENTS AND OPINIONS ADVANCED IN ANY OF ITS PUBLICATIONS.
Copyright© 1978 by The Southern African Institute of Mining and Metallurgy. All rights reserved. Multiple copying of the contents of this publication or parts thereof without permission is in breach of copyright, but permission is hereby given for the copying of titles and abstracts of papers and names of authors. Permission to copy illustrations and short extracts from the text of individual contributions is usually given upon written application to the Institute, provided that the source (and where appropriate, the copyright) is acknowledged. Apart from any fair dealing for the purposes of review or criticism under The Copyright Act no. 98, 1978, Section 12, of the Republic of South Africa, a single copy of an article may be supplied by a library for the purposes of research or private study. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means without the prior permission of the publishers. Multiple copying of the contents of the publication without permission is always illegal.
U.S. Copyright Law applicable to users In the U.S.A.
The appearance of the statement of copyright at the bottom of the first page of an article appearing in this journal indicates that the copyright holder consents to the making of copies of the article for personal or internal use. This consent is given on condition that the copier pays the stated fee for each copy of a paper beyond that permitted by Section 107 or 108 of the U.S. Copyright Law. The fee is to be paid through the Copyright Clearance Center, Inc., Operations Center, P.O. Box 765, Schenectady, New York 12301, U.S.A. This consent does not extend to other kinds of copying, such as copying for general distribution, for advertising or promotional purposes, for creating new collective works, or for resale.
