共查询到20条相似文献,搜索用时 125 毫秒
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通过系列正交试验,研究了吸水剂添加对塞拉利昂矿本身物理性能的影响.研究结果表明:塞矿含水14% ~ 16%.矿料易于形成湿粘团状物,吸水剂能够快速吸收矿料表面水分,使湿粘团状物粒度得到改善,堆密度增加. 相似文献
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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。 相似文献
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厚料层烧结技术可在不增加燃料用量的条件下使烧结矿转鼓强度提高,从而提高烧结矿成品率。通过烧结杯试验定量研究了在不同料层厚度和超厚料层条件下降低焦粉配比对料层透气性、料层热量分布、烧结矿产量和质量、吨矿烧结烟气排放量和吨矿烧结污染物排放量等烧结排放指标的影响,并对超厚料层烧结适宜的焦粉配比进行了探究。结果表明,烧结料层厚度由800 mm逐步增加至950 mm时,在相同焦粉配比条件下增加烧结料层厚度可大幅度改善烧结矿产量和质量以及各项烧结指标,从而为降低焦粉配比创造条件。当料层厚度为950 mm和焦粉配比为4.3%时,除垂直烧结速度和烧结利用系数有所降低外,可获得与料层厚度为800 mm和焦粉配比为4.5%时相当的烧结矿产量和质量以及烧结矿成品率和低温还原粉化指数等烧结指标。同时,烧结固体燃耗显著下降约6%,吨矿烧结烟气排放量和吨矿烧结污染物排放量大幅度下降,其中,吨矿NO排放量下降了24%,吨矿SO2排放量下降了35%。 相似文献
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杨迪矿和巴西矿为国内钢铁企业大规模使用的进口矿种。为降低铁前生产成本,在烧结生产中提高廉价的杨迪矿配比已成为各大钢铁企业关注的焦点。本文基于某钢铁公司的原料条件,通过烧结杯试验系统研究杨迪矿替代巴西矿对混匀料性质和烧结过程产、质量指标的影响。结果表明:杨迪矿替代巴西矿后,烧结混合料的平均粒度减小、透气性指数略有降低,该矿替代巴西矿烧结的最佳配比为23.81%,所得烧结矿的成品率为72.03%,转鼓强度为67.07%,固体燃料消耗为69.56%;相较于基准配矿方案,转鼓强度和成品率分别提高3.31%和0.40%。烧结矿微观结构和物相分析显示:适当的杨迪矿替代比(≤23.81%)会改善黏结相侵入烧结矿孔隙中与铁矿颗粒的胶结状态,提高烧结矿强度;过高的替代比(>23.81%),会使得混合料中黏附粉的含量减少、料层温度降低,导致黏结相含量不足,烧结矿强度下降。 相似文献
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为了合理利用低品位矿产资源,以褐铁矿、赫章块矿为研究对象。分别使用褐铁矿、赫章块矿、烧结矿作铺底料,研究不同烧结工艺参数对烧结成品率、烧结矿转鼓强度与冶金性能等烧结指标的影响,并优化出其烧结工艺参数。结果表明,合理使用铺底料可以强化烧结过程,改善烧结矿品质,降低生产成本。 相似文献
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叙述了韶冶ISP厚料层烧结技术的研究与应用。生产实践表明,厚料层烧结在提升烧结产能、改善烧结块质量以及处理混合矿和氧化物料方面具有独特的优势。 相似文献
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叙述了韶冶ISP厚料层烧结技术的研究与应用。生产实践表明,厚料层烧结在提升烧结产能、改善烧结块质量以及处理混合矿和氧化物料方面具有独特的优势。 相似文献
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XIONG Dalin ZHANG Gonghui YU Zhengwei CHEN Liangjun ZHANG Xuefeng LONG Hongming 《钢铁研究学报》2006,34(9):869-883
The section of the tail of sintering machine can directly reflect the rich information of sintering process control and sinter quality. How to use computer vision technology to extract the characteristics of the tail section and realize the accurate prediction and control of sinter quality is one of the key research contents of intelligent sintering. The image preprocessing methods such as denoising, segmentation and feature extraction of sinter tail section images were compared and analyzed comprehensively. Then the application situation of the image analysis technique for sintering machine tail section in the field of sinter quality prediction and control was analyzed from the aspects of FeO content in sintering ore, sintering end point, drum strength, distribution uniformity, sinter mixture moisture, etc. In addition, taking the prediction for FeO content in sintering ore as an example, the development and evolution rules of the study on sinter tail section image based on computer vision were revealed. The disadvantages of the current research and the development trend in the future were also pointed out. 相似文献
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摘要:烧结机尾的断面可以最直接地反映烧结过程控制与烧结矿质量的丰富信息。如何利用计算机视觉技术对机尾断面的特征进行提取,并实现烧结矿质量的精准预报和控制,是智慧烧结的重点研究内容之一。首先对烧结机尾断面图像的去噪、分割和特征提取等图像预处理方式进行了全面的对比和分析,然后从烧结矿FeO含量、烧结终点、转鼓强度、布料均匀性和烧结混合料水分等方面剖析了烧结机尾断面图像分析技术在烧结矿质量预报和控制方面的应用情况。另外,以烧结矿FeO含量预报为例,揭示了基于计算机视觉的烧结机尾断面图像研究的发展和演变规律,并指明了当前研究的不足以及未来的发展趋势。 相似文献
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实验室和工业试验结果表明,烧结混合料中配加巴西富矿后,混合料粒度组成改善,垂直烧结速度加快,烧结机利用系数提高.但是,随着巴西富矿粉配比的增加,成品烧结矿低温还原粉化强度( 3.15mm)下降. 相似文献
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采用三因素五水平正交试验研究了混合机填充率,转速及混合料水分对制粒效果的影响,制粒后混合料的透气性,平均粒径,抗机械冲击及抗粉化指标随填充率,转速,水分变化的规律相似,在最佳制粒区域时,四项指标均达到最佳值。最佳制粒工艺条件可以改善烧结料层原始透气性及烧结过程的透气性,提高垂直烧结速度,其他指标变化不明显。 相似文献
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Vibhuti Roshan Kamlesh Kumar Rajan Kumar G. V. S. Nageswara Rao 《Transactions of the Indian Institute of Metals》2018,71(9):2157-2164
At present around 6–7% of iron ore slimes, out of total production, are being generated and accumulated at iron ore mine sites of National Mineral Development Corporation Limited, India. The accumulated slimes of finer size and relatively inferior grade should be utilized in an economical way for sustainable mining. These slimes can be agglomerated into micro-pellets for subsequent use in sinter making through hybrid pellet sintering method. However, the micro-pellets of sufficient size and strength are required for hybrid sinter making. The green properties of the micro-pellets depend upon various parameters such as surface area, moisture, binder, etc. In this study, iron ore slimes were beneficiated through gravity, and magnetic separation and concentrate of grade 65% Fe (Total) was obtained. Since the concentrate obtained had low surface area (700–900 cm2/grams) rendering it unsuitable for micro-pellet making, it was further subjected to grinding in a ball mill. The requirement of surface area for producing an optimum quality of green micro-pellets was established. The resultant micro-pellets were further used in studying sinter bed properties. The effect of moisture and size of micro-pellets on permeability of sinter bed were examined. The results confirmed that the addition of micro-pellets to the sinter mix improved the permeability of the sinter bed. The sinter bed with highest permeability of JPU 25.25 and void fraction of 36.27% was achieved with micro-pellets of size 3–6 mm at 7% moisture level. Mean granule size of sinter mix was also studied with respect to moisture content and size of the micro-pellets. 相似文献
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An addition of the polydisperse Yakovlevo deposit sintering ore on the efficiency of pelletizing and, hence, the gas permeability of a sintering mixture containing fine concentrates is studied. This sintering ore is found to have unique properties, which make it possible to increase the iron content in a sinter and to improve the gas permeability of a sintering mixture significantly (by a factor of 2–4). As a result, the sintering machine capacity can be substantially increased, the strength of the sinter can be increased at a lower fuel flow rate and lower lime consumption, and the blast furnace capacity can be substantially improved at lower consumption of expensive coke. Therefore, this version of using the Yakovlevo deposit sintering ore has a high economic efficiency. 相似文献