高钛型钒钛磁铁矿烧结技术进步

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

攀枝花钒钛磁铁矿矿物组成复杂,其精矿产品含铁品位低、TiO2含量高,采用阶磨阶选工艺可使精矿品位达到54%,但TiO2仍高达13%左右。该精矿具有"低铁、低硅、高钛、高铝、高亚铁、高硫"的特点,同时精矿粒度粗,制粒性能差,影响烧结透气性。该精矿初始熔点高,生成液相量少,烧结矿矿物组成复杂,严重影响强度与冶金性能。近十多年来,通过采取使用生石灰,提高烧结矿碱度,燃料分加,配加普通矿粉,烧结机技术升级,采取高负压大风量烧结等一系列强化技术,烧结利用系数达到1.4 t/(m2·h),烧结矿转鼓指数在73%以上,改变了钒钛磁铁精矿烧结多年的落后状况,满足了高炉精料要求。

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 concen- trate, a small amount of liquid phase produced from the concentrate, and complex sinter lay significant influence on strength and metallurgical properties of sinter. through mineral Over the using lime to improve the sinter basicity, separately adding fuel, adding ordinary composition of past decade, mineral pow- der, upgrading sintering machine technologies, and introducing a series of strengthening technologies in- cluding high negative pressure and large air flow sintering, significant technological breakthroughs have been made to improve the sintering performances of vanadium-bearlng titaniferous magnetite concentrate with sintering machines＇ utilization coefficient of 1.4 t/（ m2 . h） and th The progress on sintering technologies for titanium-rich vanadium-bearing the requirements for sinter. e drum index of 72% or more. titaniferous magnetite can meet