不同球团矿和块矿配加条件下炉料冶金性能

 针对铁矿石品种多、质量波动大,导致高炉炉料结构稳定性下降的问题,通过实验室试验,系统研究了含铁矿石的冶金性能以及烧结矿与不同种类天然块矿和球团矿搭配的混合炉料结构高温性能。结果表明,烧结矿的还原性能和熔滴性能优于酸性球团矿和进口块矿,但是低温还原粉化现象十分严重,低温还原粉化指数RDI_{>3.15 mm}仅为70%,哈皮块矿的滴落温度过低,只有1 353 ℃,南非块矿压差过大(6 820 Pa),不利于高炉稳定顺行;里奥球和萨玛科球冶金性能优良,可以适当地提高其比例来弥补烧结产能不足的缺陷;在低烧结比(55%)条件下,不同球团搭配使用时,炉料的软化区间、熔融区间变窄,最大压差Δp_m降低,综合性能得到明显改善。最佳的混合炉料结构为55%烧结矿+20%里奥球+5%萨玛科球+20%哈皮块矿;配加纽混块矿的炉料结构,软熔区间窄,最大压值Δp_m和总特性值S低,软熔滴落性能较好。

Metallurgical properties of furnace charge under different conditions of pellet ore and block ore addition

For the iron ore variety, quality, volatility of domestic steel enterprises resulting in a decline in blast furnace burden structure stability problem, through laboratory test, the system is studied on the metallurgical properties of iron ore, the high temperature properties of the comprehensive burden structure of the sinter and different kinds of natural lump ore, the sinter and pellet collocation and different kinds of natural ore and pellets. The results show that the reduction performance and the droplet property of sinter are better than that of acid pellets and imported block ore, but the low-temperature reduction degradation phenomenon is very serious, low temperature reduction degradation index RDI_{>3.15 mm} is only 70%. Ha leather lump ore dripping temperature is too low, only about 1 353 ℃. The South Africa ore pressure difference is too large (6 820 Pa), which is not conducive to the stable and anterograde blast furnace. Due to the excellent metallurgical properties of Rio ball and samaco ball, the proportion of them can be appropriately increased in the production of the blast furnace to make up the shortage of sintering capacity and reduce the pollution to the environment. Under the condition of low sintering ratio (55%), using different pellet collocations, the burden of softening and melting interval is narrowed, the Δp_m is lowered and the comprehensive performance is obviously improved. The best composite charge structure is 55% sinter +20% Rio pellet +5% Samaco pellet +20% Hopi block ore. With the addition of the new mixed ore burden structure, the soft melting range is narrowed, the Δp_mand the S are lowered and the soft melt dripping performance is better.