Progress on Sintering Technologies for Titanium-rich Vanadium-bearing Titaniferous Magnetite

Mineral compositions of Panzhihua vanadium-bearing titaniferous magnetite are complex,and its concentrate was low in iron grade and high in TiO₂ content.With the application of staged grinding and staged separation process,the iron grade in the concentrate reached 54%,but TiO₂ content in it was still up to around 13%.Featured by ‘low iron and silica,and high titanium,aluminum,ferrous,and sulfur content’,the concentrate was greatly affected by its coarse particle size as well as poor pelletizing performance in air permeability during sintering.In addition,high initial melting point of the concentrate,a small amount of liquid phase produced from the concentrate,and complex mineral composition of sinter lay significant influence on strength and metallurgical properties of sinter.Over the past decade,through using lime to improve the sinter basicity,separately adding fuel,adding ordinary mineral powder,upgrading sintering machine technologies,and introducing a series of strengthening technologies including high negative pressure and large air flow sintering,significant technological breakthroughs have been made to improve the sintering performances of vanadium-bearing titaniferous magnetite concentrate with sintering machines' utilization coefficient of 1.4 t/(m²·h) and the drum index of 72% or more.The progress on sintering technologies for titanium-rich vanadium-bearing titaniferous magnetite can meet the requirements for sinter.