不同厚度和不同部位烧结矿质量指标变化规律

通过对700、850、1 000 mm 3个料层厚度进行相应的石英杯烧结试验,研究得出随着料层厚度增加烧结成 品率逐渐增加,烧结矿转鼓指数逐渐升高,成品烧结矿的粒度组成逐渐变好,烧结固体燃耗降低;但垂直烧结速度 显著变慢,烧结利用系数降低。对3个料层厚度进行上、中、下3层的解剖研究结果表明,对于同一解剖层的烧结 矿,3个料层厚度的烧结成品率和转鼓指数大小顺序均为700 mm<850 mm<1 000 mm,同一料层厚度的烧结矿转 鼓强度指标是上层<下层<中层,平均粒度大小是上层<中层<下层。通过矿相分析得出同一料层厚度赤铁矿和 铁酸钙质量分数是上层<中层<下层,而磁铁矿质量分数是上层>中层>下层,3个料层厚度的赤铁矿和铁酸钙质 量分数依次是700 mm<850 mm<1 000 mm。     

料层厚度对钒钛烧结矿性质的影响探析

通过对攀钢烧结生产数据进行统计分析,找出了料层厚度与钒钛烧结矿的强度、FeO量和烧结生产的负压、点火煤气消耗、固体燃耗、成品率等的关系.     

料层厚度对钡钛烧结矿性质的影响探析

通过对攀钢烧结生产数据进行统计分析,找出了料层厚度与钡钛烧结矿的强度、ＦｅＯ量和烧结生产的负压、点火煤气消耗、固体燃耗、成品率等的关系     

利用数字图像处理技术在线检测烧结台车料层厚度

针对烧结台车料层厚度检测维护困难和检测数据受环境影响大的问题,攀钢集团攀枝花钢钒有限公司炼铁厂开发了视频烧结台车料层厚度检测系统。系统根据监视的烧结台车布料视频图像,运用数字图像处理技术计算测量臂角度,通过测量臂与料层厚度的转换关系间接得到料层厚度。在实际生产中,采用此种非接触检测方法测量料层厚度得到了很好的应用效果。     

烧结料层厚度检测仪在生产中的应用

攀钢炼铁厂研制开发的烧结料层厚度监测仪在生产中应用后，促进了该厂烧结生产操作的稳定与进步，取得了产质量提高的良好效果。     

浅谈烧结矿构造和结构的鉴定研究

烧结矿的结构具有物理和化学的两方面含义，本文简述了矿相鉴定的方法并对鉴定结果进行了分析，从而得出随着烧结混合时间延长，烧结矿的质量逐渐改善。     

高褐铁矿配比下提高烧结矿产质量指标

为了在高褐铁矿配比下提高烧结矿产质量指标,在把握烧结混匀矿特性的基础上,通过微型烧结试验和烧结杯试验,研究了高褐铁矿配比下烧结矿二元碱度、钙质熔剂种类等因素对烧结黏结相数量、强度和类型,以及烧结矿产质量指标的影响.结果表明:在高褐铁矿配比下,提高烧结矿二元碱度至2.0水平,并采取适当增加生石灰使用比例以及提高烧结抽风负压和烧结料层高度的配合措施能够改善烧结矿产质量指标.     

宝钢热废气烧结实验室研究烧结矿矿相分析

在实验室条件下研究了不同热废气温度对宝钢原料条件下烧结矿的产质量的影响，并着重利用矿相分析对结果进行了分析的讨论。     

太钢不同碱度烧结矿的相分析

通过对不同碱度烧结矿的矿物组成及显微结构的观察分析，针对太钢尖山铁矿粉ＳｉＯ２含量高，易生成硅酸盐粘结相的特性，提出了通过控制适宜碱度的途径来改善烧结矿的质量，为高炉提供精料。     

提高烧结矿转鼓强度的生产实践

介绍武钢炼铁总厂烧结分厂为了提高烧结矿转鼓强度的系列试验摸索和生产实践。结果表明,采用厚料层烧结、实行统一操作、控制亚铁含量等措施,可有效提高烧结矿转鼓强度,满足高炉的生产需要。     

鞍矿东烧厂厚料层烧结生产实践

烧结厚料层操作可提高烧结矿质量、改善烧结矿质量、降低能耗。鞍矿东烧厂为了采取这一新工艺 ,将 2号烧结机进行了一系列改造 ,其中包括将台车挡板高度由原来的 370 m m提高到 5 0 0 mm,收到了良好的效果。     

Analysis of Vanadium-Bearing Titanomagnetite Sintering Process by Dissection of Sintering Bed

 Many problems appear in the sintering process of vanadium bearing 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.     

Modelling and visual verification of combustion zone transfer in ultra-thick bed sintering process

The propagation of the combustion zone is of great importance to the ultra-thick bed iron ore sintering process. A two-dimensional unsteady level modelling of the combustion zone propagation was developed. Influences of sintering bed height and coke content on the combustion zone propagation characteristics were analysed and discussed. Simulation results were compared with the results of visual sintering pot test which was straightforward and distinct to clarify the combustion zone propagation. Calculation of this numerical simulation was performed for various sintering bed height and coke contents. Both the increase of sintering bed height and coke fraction in raw mix resulted in the improvement of thickness and maximum temperature of the combustion zone. Simulation results were consistent with the measured data.     

不同料层高度烧结过程尾气排放规律

研究了不同料层高度下烧结过程中尾气成分(O₂、CO₂、SO₂和NO)的变化规律.结果表明:随着烧结历程的推进,尾气中O₂含量降低而CO₂含量升高,这主要是因为固体燃料燃烧量逐渐增多;尾气中SO₂、NO的含量亦呈升高趋势,但幅度很小,这主要是因为烧结料层对SO₂有吸收作用,而燃烧带的CO气体则可以还原使部分NO分解;在临近烧结终点时,因料层对SO₂的吸收作用消失而使析出作用强化,导致尾气中SO₂含量急剧升高.另外,随着料层高度的增加,因固体燃料配比相应减小,尾气中CO₂、SO₂和NO的含量降低,而O₂含量增加.因此,控制高温区宽度的厚料层烧结技术是我国开展减少烧结尾气中气体污染物(CO₂、SO₂和NO)的有效措施.     

配加南非粉对首钢烧结矿产质量影响的研究

为了拓宽首钢烧结用料,达到优化烧结原料结构和降低能耗的目的,根据南非矿粉的物相和理化特性,按不同比例配加南非矿粉进行了烧结杯试验和工业试验,得出了适宜的工艺参数和生产指标,为首钢烧结厂进一步优化配料,改善烧结矿质量,降低烧结能耗提供了依据.     

菱铁矿的烧结特性

介绍了利用新疆菱铁矿进行500mm厚料层烧结杯试验的研究结果。探讨了烧结矿的碱度、固体燃料的用量及菱铁矿与磁铁矿不同配比等因素对烧结矿质量的影响,并结合菱铁矿烧结性能和矿相分析找到了获得较高质量烧结矿的最佳工艺参数,尽可能地利用菱铁矿资源进行烧结生产。试验结果表明：配碳量在4.8%～5.7%（质量分数,下同）时,菱铁矿...     

Similarity-Guided Depth of Retrieval: Constraining at the Front End.

Lee Brooks has done important work to show that categorization often reflects reliance on specific instances rather than on an abstract representation. His work on the advantages of using a diagnostic hypothesis to search medical stimuli has demonstrated how constraining what one looks for influences clinical reasoning. Similarly, cognitive control can be accomplished by constraining memory retrieval in ways that influence interpretation of a memory probe. Here, we report two experiments in which the similarity of study items constrained how test items were interrogated for an immediate memory test and thereby produced differences in the depth of retrieval. A novel procedure that tests foil memory was used to diagnose differences in similarity-guided retrieval depth. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

提高厚料层烧结燃料燃烧性的试验研究

厚料层烧结是烧结技术发展的重要方向,但料层增厚引起一系列烧结行为的变化,如自动蓄热加强,导致料层高温区变厚,气体体积膨胀量增加,透气性恶化,氧气的质量含量降低,燃料燃烧速度减慢,高温区宽度进一步增加,还使得残碳和无益燃烧增加,下部烧结矿过熔,影响烧结矿的产、质量,进而降低厚料层的节能效果。为了解决这些问题,采用粒度为1.00~3.15 mm的高燃烧性燃料,选择燃料的配加方式为"燃料分加"或"燃料、熔剂共同分加"等方案提高厚料层烧结固体燃料的燃烧性,并对各试验方案下的透气性和烧结指标进行研究,结果表明上述3个措施均有利于厚料层烧结的实施。