Dauter Oliveira
,
WU Sheng-li
,
DAI Yu-ming
,
XU Jian
,
CHEN Hong
钢铁研究学报(英文版)
In order to obtain good sintering performance, it is important to understand sintering properties of iron ores. Sintering properties including chemical composition, granulation and high-temperature behaviors of ores from China, Brazil and Australia. Furthermore, several indices were defined to evaluate sintering properties of iron ores. The results show that: for chemical composition, Brazilian ores present high TFe, low SiO2, and low Al2O3 content. For granulation, particle diameter ratio of Brazilian ores are high; particle intermediate fraction of Chinese concentrates are low; and average particle size and clay type index of Australian ores are high. For high-temperature properties, ores from China, Brazil and Australia present different characteristics. Ores from different origins should be mixed together to obtain good high-temperature properties. According to the analysis of each ore′s sintering properties, an ore blending scheme (Chinese concentrates 20%+Brazilian ores 40%+Australian ores 40%) was suggested. Moreover, sinter pot test using blending mix was performed, and the results indicated that the ore blending scheme led to good sintering performance and sinter quality.
关键词:
sintering
,
iron ore
,
sintering property indices
,
ore blending scheme
BAI Yongqiang
,
CHENG Shusen
,
BAI Yanming
钢铁研究学报(英文版)
Many problems appear in the sintering process of vanadiumbearing titanomagnetite, such as high energy consumption and low productivity; sinter quality is also very poor for its low tumble strength and high reduction degradation. Sinter productivity and quality are dominated by bed permeability and mineralogy structure, which are highly influenced by the thermal state of sintering bed, so the sintering process of titanomagnetite is researched by bed dissection in this work. Temperature evolution curves of sinter materials were measured, and the results show that melting duration, peak temperature duration and sintering temperature of different layers differ greatly from each other; flame front speed and vertical sintering speed of bed lower region are much smaller than those of bed upper region. Simultaneously, sinter samples were collected from different layers, and their mineralogy characteristics are analyzed; sinters from bed lower region have poor mineralogy structure, and the amounts of perovskite and dicalcium silicate increase intensively, which are bad for sinter strength and reduction degradation property. Measures are proposed to improve the quality and productivity of titanomagnetite sinter.
关键词:
sintering
,
vanadiumbearing titanomagnetite
,
thermal state
,
bed dissection
,
mineralogy characteristic
吴胜利
,
樊佳欣
,
朱娟
,
贝纪承
,
阙志刚
钢铁研究
doi:10.13228/j.boyuan.issn1001-0963.20130360
为了有效发挥生石灰在制粒过程的作用,依据生石灰的吸水特性对烧结料制粒水分进行优化,是值得深入研究的工艺技术问题.考察了固定量配水、满足生石灰完全消化的配水,以及满足生石灰湿容量的配水等3种加水量选取方式,对烧结混合料制粒效果的影响.研究结果表明:烧结制粒过程中生石灰的吸水,一方面消耗于生成Ca(OH)2的化合水,另一方面还包括生石灰消化后自身吸收的物理水,二者影响烧结料的水分含量及分布;当制粒水分满足化合水消耗时,虽然烧结料水分得以保证,但消石灰和CaCO3吸水会争夺铁矿粉中的水分而影响制粒效果;当制粒水分满足生石灰湿容量时,可获得适宜烧结制粒水分,使铁矿粉中的水分得以保证,生石灰改善制粒的作用充分发挥.
关键词:
烧结
,
生石灰
,
湿容量
,
制粒水分
董辉，赵勇，蔡九菊，周节旺，马光宇
钢铁
从余热回收与利用角度，在热工测试的基础上，系统分析了烧结和冷却系统漏风的成因，定量研究了漏风对余热回收与利用的影响，并从减小漏风部位内外压差的角度提出了控制漏风的手段。研究表明，冷却系统漏风使得中国大中型烧结机工序能耗增加3%~4%，烧结系统漏风使得工序能耗增加8%~10%；正确设置冷却段鼓风机全压，使得烧结矿层上部和集气罩下部处于微正压，这是降低冷却系统漏风的有效途径之一；降低烧结机引风机的流量与全压是降低烧结系统漏风的另一条有效途径。
关键词:
烧结
,
waste-heat
,
leakage
,
recycling
,
energy
