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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。
The complex composition of vanadium-titanium magnetite in Panzhihua shows that the concentrate products have low ferrous grade and high TiO2 content. The grade of ore concentrates can reach 54% using the step-grinding step process, but the content of TiO2 is as high as 13%. The concentrate has the characteristics of “low iron, low silicon, high titanium, high aluminum, high ferrous iron and high sulfur”, meanwhile, the coarse grain size and poor granulation performance affect the sintering gas permeability. The high initial melting point of the concentrate, the formation of liquid phase, sinter minerals complex composition, seriously affecting the strength and metallurgical properties. In recent ten years, through the use of quicklime, increase sinter alkalinity, fuel sub-plus, with ordinary ore, sintering machine technology upgrades, to take a series of high-pressure air volume sintering and other strengthening techniques, sintering coefficient of 1.4 t / (m2 · h), sinter drum index above 73%, changing the vanadium titanium magnetite sintering lagged for many years to meet the blast furnace concentrate requirements.