A novel reductive alkali roasting of chromite ores for Carcinogen-free Cr6+-ion Extraction of chromium oxide (Cr2O3) – a clean route to chromium product manufacturing!

Autor: Sergio Sanchez-Segado, L. Escudero-Castejon, Animesh Jha, James E. Taylor

A novel reduction reaction for extracting Cr2O3 from chromite ores is demonstrated by excluding the formation of carcinogenic chromate (Cr6+) intermediates. We have investigated in detail the underpinning high-temperature reduction reaction: FeCr2O4+

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b5790b57c1c9a3d4819beca093fe3f69
https://eprints.whiterose.ac.uk/163945/1/HAZMAT-D-20-00155_R2.pdf

Comparative study of alkali roasting and leaching of chromite ores and titaniferous minerals

Autor: L. Escudero-Castejon, Sergio Sanchez-Segado, Animesh Jha, S. Parirenyatwa, Yotamu Stephen Rainford Hara

Publikováno v: Hydrometallurgy. 165:213-226

Extraction of titanium and chromium oxides may be achieved via roasting the respective minerals with alkali at high temperatures, followed by water and organic acid leaching. In this study, sodium and potassium hydroxides are used as alkali for roast

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1e9585ab1e4e9f88051067753fdee4d4
https://doi.org/10.1016/j.hydromet.2015.08.002

A Cr6+-Free Extraction of Chromium Oxide from Chromite Ores Using Carbothermic Reduction in the Presence of Alkali

Autor: L. Escudero-Castejon, S. Parirenyatwa, Animesh Jha, Yotamu Stephen Rainford Hara, Sergio Sanchez-Segado

Publikováno v: The Minerals, Metals & Materials Series ISBN: 9783319510903

Oxidative alkali roasting of chromite is the state-of-the-art process for manufacturing chromium-containing chemicals, which involves dealing with serious environmental problems arising from handling Cr6+-containing wastes generated in this process.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d0c1986bcca13e259e042ff44dcd41a9
https://doi.org/10.1007/978-3-319-51091-0_16

Investigation of Molten Salt Phase Formation during Alkali Roasting of Titaniferous Minerals with Sodium and Potassium Hydroxide

Autor: Sergio Sanchez-Segado, S. Parirenyatwa, L. Escudero-Castejon, Animesh Jha, Yotamu Stephen Rainford Hara

Publikováno v: Scopus-Elsevier
Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016 ISBN: 9783319486253
Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts

The benefit of alkali roasting over existing processes is that it minimises waste and energy consumption compared with the current methods for the beneficiation of titaniferous minerals. Previous studies on the liquid phase formation during alkali ro

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4ce17700cf83a7ab8f08bc74990b2d89

ChemInform Abstract: Reclamation of Reactive Metal Oxides from Complex Minerals Using Alkali Roasting and Leaching - An Improved Approach to Process Engineering

Autor: Terence Makanyire, L. Escudero-Castejon, Sergio Sanchez-Segado, Animesh Jha, Yotamu Stephen Rainford Hara

Publikováno v: ChemInform. 46

In nature, the commonly occurring reactive metal oxides of titanium, chromium, aluminium, and vanadium often chemically combine with the transition metal oxides such as iron oxides and form complex minerals. Physico-chemical separation of transition

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5437565ab4032708469c25e903677709
https://doi.org/10.1002/chin.201523298