Paper Title:
Magnesium Removal from TiC-TiB2 SHS-Powders by Controlled Hot Acid Leaching
  Abstract

TiC and TiC–TiB2 powder mixtures obtained directly from titanium (TiO2) and boron (B2O3 or B4C) raw-materials by reduction with magnesium by self propagating high temperature synthesis (SHS) contain, as impurity, large quantities of MgO under its periclase form, together in some cases with unreacted magnesium. Several leaching agents, namely hydrochloric acid, sulphuric acid, acetic acid and EDTA were tested aiming at removal of magnesium from these powders as required characteristic for further work. Several parameters as leachant concentration, pH, reaction time and temperature were evaluated. Alternative leaching methodologies were compared in order to achieve magnesium removal yields over 98% and minimising at the same time the expected high matrix losses due to TiC and/or TiB2 co-solubilisation. As main conclusion it was established that strong hydrochloric acid (6M) is the most efficient medium to remove magnesium from these particular TiC-TiB2 SHS mixtures. The leaching methodology used (controlled hot acid leaching under close conditions) allowed to minimise TiC and TiB2 solubilisation losses. Sulphuric acid is not an effective leaching medium and contaminates the resulting powder mixture with unfriendly sulphur. Using acetic acid, magnesium removal yield is low and titanium losses are considerable. On the other hand, low aggressive EDTA complexant leaves TiC-TiB2 matrix unalterable but residual MgO remains over 6%. The proposed process seems to have potential for application in the general field of semi-micro materials purification.

  Info
Periodical
Materials Science Forum (Volumes 514-516)
Edited by
Paula Maria Vilarinho
Pages
594-598
DOI
10.4028/www.scientific.net/MSF.514-516.594
Citation
F. Delmas, L. Gonçalves, I. M. Martins, M. Oliveira, "Magnesium Removal from TiC-TiB2 SHS-Powders by Controlled Hot Acid Leaching", Materials Science Forum, Vols. 514-516, pp. 594-598, 2006
Online since
May 2006
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Paula C. Oliveira, M.C. Rosa, Lucinda Gonçalves, Maria A. Trancoso, Carlos A. Nogueira
Abstract:Sludges generated in leather tanning processing are very complex wastes with potential deleterious effect on the environment and its...
758
Authors: Burcu Akkas, Murat Alkan, Bora Derin, Yücel Onüralp
Abstract:In this study, the self-propagating high-temperature synthesis (SHS) and following acid leaching techniques were carried out to produce...
251
Authors: Nitus Tipsotnaiyana, Lerpong Jarupan, C. Pechyen
II. Biomaterials Science
Abstract:Rice husk is a form of agricultural biomass that provides an abundant silicon dioxides source. This study use rice husk ash as a material to...
218
Authors: Athiwat Sirimuangjinda, Duangduen Atong, Chiravoot Pechyen
Abstract:Two activated carbons employing Scrap Tire as precursor were produced by using two different activating agents, HCl and...
706
Authors: Aleksandr P. Amosov, A.R. Luts, A.A. Ermoshkin
Chapter 3: Advanced Materials and Nanotechnologies
Abstract:The aim of this study was an investigation of the influence of technological parameters of the process of self-propagating high-temperature...
281