Reference : Potential for application of alkali roast acid leach technology for removal of phosph...
Scientific congresses and symposiums : Paper published in a book
Engineering, computing & technology : Geological, petroleum & mining engineering
http://hdl.handle.net/2268/134757
Potential for application of alkali roast acid leach technology for removal of phosphorus from iron ore
English
Ionkov, Krassimir mailto [Université de Liège - ULg > Département Argenco : Secteur GeMMe > Traitement et recyclage des matières minérales >]
Gaydardzhiev, Stoyan mailto [Université de Liège - ULg > Département Argenco : Secteur GeMMe > Traitement et recyclage des matières minérales >]
Bastin, David mailto [Université de Liège - ULg > Département Argenco : Secteur GeMMe > Génie minéral et recyclage >]
Correa de Araujo, Armando [> >]
Oct-2012
Proceedings of 6-th International Congress on the Science and Technology of Ironmaking ICSTI
Yes
No
International
ISSN 2176-3135
6-th International Congress on the Science and Technology of Ironmaking ICSTI
14-18 october 2012
Brazilian Association for Metallurgy, Materials and Mining – ABM
Rio de Janeiro
Brazil
[en] iron ore ; dephosphorisation ; roasting
[en] The present study deals with the effect of sodium hydroxide and sodium carbonate used as additives during oxidizing roasting of oolitic limonite iron concentrate and more precisely upon the change in its magnetic susceptibility. Further, the efficiency of Alkali Roast Acid Leach (ARAL) technology for dephosphorisation of the concentrate is compared with the case when sodium hydroxide was added in alkali leach after roasting. The treatment without additives in roasting resulted in obtaining iron concentrate with 58 % iron and 0.21 % phosphorus, while the ARAL approach yielded concentrate with 63 % iron and 0.09 % phosphorus. The influence of combination of coke as reducing agent and sodium hydroxide in roasting at 900°C is also investigated and results displayed in 3D form. The combination of ARAL with reductive roasting, grinding of the clinker to 80 % - 0,075 mm, flotation of the non-reacted coke and magnetic separation before and after the acid leach resulted in iron concentrate with 66 % iron and 0.05 % phosphorus. The study has shown that the application of the ARAL approach with low addition of alkalis followed by 10 to 15 minute acid leaching at ambient temperature could substantially reduce phosphorus, thus offering the possibility for efficient treatment of high phosphorus iron ores.
IPRIS
Researchers
http://hdl.handle.net/2268/134757

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