共查询到19条相似文献,搜索用时 125 毫秒
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烧结矿表面喷洒CaCl2溶液应用试验 总被引:1,自引:0,他引:1
1 前言 烧结矿和球团矿的低温还原粉化是影响高炉生产的重要因素之一.改善烧结矿低温还原粉化性能的措施一般有提高烧结矿的FeO和MgO的含量、生产高碱度烧结矿、添加蛇纹石、硅石等,但这些措施对烧结矿质量和品位有一定的影响,而且使高炉燃耗增加.因此,20世纪80年代中期,国外烧结生产者研究开发了能降低烧结矿低温粉化的方法--卤素溶液法. 相似文献
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在高炉操作过程中添加适量MgO的新工艺 总被引:1,自引:0,他引:1
在实验室实验的基础上,研究了MgO对烧结过程和烧结矿冶金性能的影响.实验结果表明,烧结过程中不添加或少添加MgO可以提高烧结生产率和烧结矿冷强度,缩小高炉软熔带温度区间,从而改善软熔带的透气性,降低高炉内总压差.本文提出了一种将适量MgO添加到高炉中的新工艺,采用这种工艺时,炉渣中MgO的含量能够满足高炉生产的需要,同时还能降低烧结矿低温还原粉化率. 相似文献
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通过对塞拉利昂矿粉(块矿)物理、化学、热态性能的研究,发现塞拉利昂矿满足高炉对原料的要求。通过烧结杯试验表明,烧结矿中配加一定的塞拉利昂矿,烧结矿软化融滴性能有改善的趋势,烧结矿的低温还原粉化指数、融滴性能均可满足高炉生产要求。 相似文献
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Measures of Decreasing Blast Furnace Fuel Consumption and Improving Sinter Performance in Guofeng 总被引:1,自引:0,他引:1
To further decrease the fuel consumption of blast furnace in Tangshan Guofeng Iron and Steel Co Ltd, measures of improving the quality of sinter and pellet and the performances of raw materials were put forward through phase analysis and physical and chemical performance testing. The measures of increasing the grade of sinter, decreasing the sinter reduction degradation index at low temperature, and increasing the sinter soft melt performance at elevated temperature, as well as the reasonable process parameters of sintering were described in detail. 相似文献
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D. Fernández-González I. Ruiz-Bustinza J. Mochón C. González-Gasca L. F. Verdeja 《Mineral Processing and Extractive Metallurgy Review》2017,38(4):254-264
Sinter plants process a mixture of iron ore fines, recycled ironmaking products, slag-forming agents and solid fuel (coke) with the finality of obtaining a product with the suitable characteristics (thermal, mechanical, physical, and chemical) for being fed to the blast furnace. With this objective a series of parameters are defined, including the nature and composition of each component of the mixture, and the conditions of the sintering process. Sinter characterization includes chemical and granulometric analysis, determination of the mineral phases in its structure, apart from a series of quality indices that includes reducibility, low temperature degradation, reduction degradation and Tumbler. Operated sinter plants with the maximum productivity are also important with the purpose of obtaining a sinter with uniform composition and quality for facilitating the steady state operation of the blast furnace. 相似文献
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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Δpm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Δpm和总特性值S低,软熔滴落性能较好。 相似文献
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国内某厂生产的低钛烧结矿可用于2 500 m3高炉冶炼,强度指标达到普通烧结矿水平,但其低温还原粉化率仍比普通烧结矿高40%以上,还原粉化机理尚不明确。通过分段测试低钛烧结矿的还原粉化率并进行矿相分析,结果发现:低钛烧结矿中的赤铁矿-气孔结构是产生裂纹的源头,铁酸钙熔蚀结构是主要粘结相,但此结构中有许多细小裂纹,裂纹沿程存在许多赤铁矿晶粒,其还原速率较快且易形成交叉网状裂纹,使粘结相结构受到严重破坏,致使烧结矿还原粉化性能差。 相似文献
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《钢铁冶炼》2013,40(2):91-95
AbstractThe MgO in blast furnace slag provides an optimum condition in terms of both good flowability and desulphurisation. The mode of its addition to the blast furnace changed from, initially, as raw flux in the form of dolomite, to via sinter, with the argument that raw flux demands energy for its decomposition inside the blast furnace. Thus, the decomposition reaction was diverted from the blast furnace to the sintering bed, and the energy source for decomposition was changed from costly blast furnace coke to a relatively cheap coke breeze. Now olivine/dunite/serpentine is being used as a source of MgO, where energy for decomposition is not required; this also provides a source of SiO2, which eliminates need for the addition of quartzite. The effect of MgO on blast furnace slag is fairly well established, but its effect on sintering and sinter quality is unclear. Operating results of the sinter plants show that, with an increase of MgO, the sintering rate, the fuel rate, and sinter strength and reducibility deteriorate; however, high temperature properties such as the reduction degradation index and the softening-melting characteristics of the sinter improve. The present work attempts to establish this influence on the sintermaking process and sinter quality with the help of operating plant data. 相似文献
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烧结矿和球团矿吸附锌的规律及冶金性能变化的研究 总被引:1,自引:0,他引:1
模拟高炉中锌的还原及其蒸气在炉料吸附的过程,对入炉烧结矿、球团矿做了锌吸附及低温还原粉化的试验。试验结果表明:烧结矿和球团矿的吸附锌量随着温度的增加而提高,随着粒度的增大而减少;随着锌吸附量的增加,烧结矿和球团矿的低温还原粉化指标下降,这会影响到高炉的透气性,生产中应对入炉原料的锌含量做严格控制。 相似文献
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烧结矿在高炉低温还原气氛下容易发生碎裂粉化,会严重影响高炉透气性进而破坏高炉顺行。RDI>3.15 mm(低温还原粉化指数)是反映烧结矿低温还原粉化现象发生程度的重要指标,但其大小受到烧结原料中MgO、Al2O3、碱度R等主要因素的影响。为了探究烧结原料成分因素对烧结矿低温还原粉化性能的影响程度及交互作用,提出一种基于RDI>3.15 mm响应面的烧结原料配矿优化方法。首先,以w(MgO)、w(Al2O3)、碱度R为自变量,以烧结矿RDI>3.15 mm指数为响应值,建立烧结矿RDI>3.15 mm指数的响应面模型;其次,对试验得到的烧结矿RDI>3.15 mm指数进行拟合,得到烧结矿RDI>3.15 mm指数的预测公式;最后,通过最佳原料配比自制烧结矿并测得其RDI>3.15 mm指数,验证了所提出方法的... 相似文献