TY - GEN
T1 - Preparation of Tio2-Enriched Material from Ti-Bearing Slag by Acid Roasting
AU - Nheta, Willie
AU - Malenga, Edward
N1 - Publisher Copyright:
© 2015, Avestia Publishing. All rights reserved.
PY - 2015
Y1 - 2015
N2 - EVRAZ Highveld Steel and Vanadium has about 45 million tons of slags which assays at 31% TiO2. This slag can become a raw material for extracting titanium instead of it being a waste product and causing environmental pollution (Zhang et al, 2014). Several mineral processing and metallurgical processes have been proposed for treating Ti-bearing slags such as middle grade rutile making, titanium pigment making by H2SO4 method and Si-Al-Ti alloy by smelting (Zhong et al, 2014, Sui et al, 2013, Lasheen, 2008). Due to the solid solution of titanium and other elements in the slag and complex interfacial combinations, the application of these processes may results in poor recovery and high cost as previously shown. (Liu et al, 2007). An attempt to upgrade the titanium content from the slags was investigated. Combined pyrometallurgy and hydrometallurgy processes were applied based on the reactivity of Mg, Si, Ca and Fe with selected solvents. Acid roasting with phosphoric acid was used with the objective of modifying the structure of the sample in order to form water soluble compounds of Mg, Fe and Ca after roasting at 1000OC. The calcine was then leached in sulphuric acid in order to remove the formed Mg, Ca and Fe compounds. The residue was then leached in sodium hydroxide in order to remove the silicates. It was observed that an upgrading of TiO2 to 48.3% by weight was realized when leaching with 1% H2SO4 while the XRD results revealed the presence of titanium in the form of rutile (TiO2) ,Ilmenite [Fe (Ti O3)] and Karrooite (Mg Ti2 O5) as major phases. TiO2 grade was further increased to 61% after leaching in the residue in sodium hydroxide.
AB - EVRAZ Highveld Steel and Vanadium has about 45 million tons of slags which assays at 31% TiO2. This slag can become a raw material for extracting titanium instead of it being a waste product and causing environmental pollution (Zhang et al, 2014). Several mineral processing and metallurgical processes have been proposed for treating Ti-bearing slags such as middle grade rutile making, titanium pigment making by H2SO4 method and Si-Al-Ti alloy by smelting (Zhong et al, 2014, Sui et al, 2013, Lasheen, 2008). Due to the solid solution of titanium and other elements in the slag and complex interfacial combinations, the application of these processes may results in poor recovery and high cost as previously shown. (Liu et al, 2007). An attempt to upgrade the titanium content from the slags was investigated. Combined pyrometallurgy and hydrometallurgy processes were applied based on the reactivity of Mg, Si, Ca and Fe with selected solvents. Acid roasting with phosphoric acid was used with the objective of modifying the structure of the sample in order to form water soluble compounds of Mg, Fe and Ca after roasting at 1000OC. The calcine was then leached in sulphuric acid in order to remove the formed Mg, Ca and Fe compounds. The residue was then leached in sodium hydroxide in order to remove the silicates. It was observed that an upgrading of TiO2 to 48.3% by weight was realized when leaching with 1% H2SO4 while the XRD results revealed the presence of titanium in the form of rutile (TiO2) ,Ilmenite [Fe (Ti O3)] and Karrooite (Mg Ti2 O5) as major phases. TiO2 grade was further increased to 61% after leaching in the residue in sodium hydroxide.
KW - Leaching
KW - Phosphoric acid
KW - Roasting
KW - Ti bearing slag
UR - http://www.scopus.com/inward/record.url?scp=85146704109&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85146704109
SN - 9781927877173
T3 - Proceedings of the World Congress on Mechanical, Chemical, and Material Engineering
BT - Proceedings of the World Congress on Mechanical, Chemical, and Material Engineering, MCM 2015
A2 - Chaouki, Jamal
A2 - Zhao, Yuyuan
PB - Avestia Publishing
T2 - World Congress on Mechanical, Chemical, and Material Engineering, MCM 2015
Y2 - 20 July 2015 through 21 July 2015
ER -