Preparing high-quality vanadium titano-magnetite pellets for large-scale blast furnaces as ironmaking burden. (7th February 2020)

• Record Type: Journal Article
• Authors: Gan, M.; Sun, Y.-F.; Fan, X.-H.; Ji, Z.-Y.; Lv, W.; Chen, X.-L.; Jiang, T.
• Is Part Of: Ironmaking & steelmaking. Volume 47:Number 2(2020)
• Page Start: 130
• Page End: 137
• Publication Date: 2020-02-07
• Subjects: VTM concentrates -- pellets -- oxidation behaviour -- consolidation characteristics; Iron industry and trade -- Periodicals; Steel industry and trade -- Periodicals; 669.1
• DOI: 10.1080/03019233.2018.1492500
• Languages: English
• ISSNs: 0301-9233

Abstract

ABSTRACT: The oxidation behaviour and the phase and microstructure evolution of VTM (vanadium titano-magnetite) pellets were studied during thermal processing in order to optimise the production method for producing high-quality pellets. The oxidation tests showed that titanium magnetite and ilmenite in VTM began to oxidise at 500°C and 700°C, respectively. When the temperature reached 875°C, VTM was mainly oxidised to Fe2 O3, while Fe2 TiO5 was the main oxidation product when the temperature reached 1050°C. The consolidation of the pellets was affected by the degree of oxidation and the oxidation products. Results indicated that the most suitable oxidation ratio was about 70%, and the preferred mineral phase was recrystallised Fe2 O3, which was beneficial to improving pellet consolidation in roasting process. The most appropriate oxidation condition was 875°C for 12 min, which contributed to forming more Fe2 O3 phase, and the compressive strength of roasted pellet reached 2939 N. The pellets could be used as a high quality ironmaking burden for large-scale blast furnaces.