CVRD矿在青钢的应用

巴西 CVRD矿具有含铁品位高、有害杂质少、烧结性能良好的特点。采用 CVRD矿作为烧结配矿的主矿 ,经合理配比和优化工艺参数 ,烧结生产率提高 ,烧结矿质量改善 ,冶金性能提高     

铁矿粉烧结优化配矿及其模型研究进展

随着铁矿粉资源的不断消耗,各类铁矿粉呈劣化趋势,且大量新矿种出现,使烧结优化配矿需求愈发迫切.主要介绍了铁矿粉常温和高温等基础特性.其中,常温特性主要有化学成分、铁矿粉种类、粒度组成等,同时重点分析了与烧结生产息息相关的高温特征指标,主要有同化性、液相流动性、黏结性强度、铁酸钙生成特性、连晶特性、熔融特性、吸液性和烧结...     

铁矿粉的烧结特性及优化配矿试验研究

 以来自澳大利亚、巴西、印度、南非以及中国的6种烧结铁矿粉作为考察对象,分别研究其化学成分、粒度组成、颗粒形貌和气孔率,并对其同化性、液相流动性、黏结相自身强度和铁酸钙生成特性等高温烧结特性进行试验测定和因素考察。在该研究基础上,提出基于铁矿粉配矿特性互补配矿原则,设计了6组优化配矿方案,对混合矿进行特性研究,且烧结杯试验结果显示获得较好的烧结经济技术指标。     

巴西矿和澳矿的烧结性能试验

采用微型烧结法对河钢常用进口铁矿粉的烧结基础性能进行了测试,并与单烧矿质量进行了对比分析。结果表明：巴西矿粉的同化性能差,粘结相强度高;澳洲矿粉的同化性能好,粘结相强度差。SiO₂含量高、Al₂O₃含量低的进口赤铁矿,其液相流动性强,SiO₂含量高的进口赤铁矿的SFCA生成能力强。矿粉的粘结相强度高,其单烧矿的转鼓指数较高;SFCA生成能力适宜,其烧结成品率较高;同化性能强,其单烧矿的还原性较强。     

澳大利亚铁矿粉的烧结基础特性的实验研究

该澳大利亚铁矿粉是一种特殊的烧结用混合矿粉。研究其烧结基础特性,并与目前国内广泛使用的两种澳洲矿粉进行比较。其研究结果有助于中国钢铁企业通过烧结优化配矿有效使用这种特殊的铁矿粉资源。     

改善烧结矿质量降低高炉炼铁燃耗

 通过试验研究了唐山国丰钢铁有限公司（简称国丰）使用的各种进口矿的性能;通过分别配加澳矿、巴西矿和印度矿进行配矿试验,确定了合理的配矿方案。借助试验进一步确定了合理的烧结工艺参数。通过合理控制烧结矿的碱度、MgO含量、Al2O3含量和FeO含量以及采用低温烧结,保持较强的氧化性气氛,烧结矿质量获得明显改善,低温还原粉化率降低,有效降低了高炉炼铁的燃耗。     

Improvement of sintering characteristics by selective granulation of high Al2O3 iron ores and ultrafine iron ores

The worldwide steel companies are expected to use low grade iron ores such as pisolitic iron ores, high Al₂O₃ iron ores and ultrafine iron ores etc. in their sinter blends due to the depletion of high grade iron ores or for the economic reason. This study investigated the methods for improving sintering characteristics without deteriorating sintering productivity and sinter quality by blending mini-pellets comprising high Al₂O₃ pisolitic iron ores and ultrafine iron ores containing low alumina. The results showed that the blending of iron ore mini-pellets produced by selective granulation is an effective way to improve sintering productivity and sinter quality without increasing the Al₂O₃ content in sinter as well as to effectively utilise high Al₂O₃ iron ores and ultrafine iron ores in the sintering process.     

Effect of characteristics of coarse iron ores on the granulation behaviour of concentrates in the sintering process

To strengthen the granulation behaviour of concentrates and thereby improve the permeability of the sinter bed. In this paper, granulation experiments were conducted for the case of concentrates as adhesive powders, and five kinds of coarse ores were used as nuclei particles. Then, the effect of characteristics of coarse ores on the granulation behaviour of concentrates was investigated. Furthermore, optimised blending ore was explored to strengthen the granulation behaviour of concentrates by sinter pot tests. The results showed that the growth index had a positive correlation with the circularity degree but a negative correlation with the contact angle and water absorption of coarse ores. In addition, the granulation index increased by 30 % by optimising the blending ore when the sinter blending ore contained 15 mass% concentrate. The vertical sintering speed increased from 26.32 to 29.82 mm·min^?1, the yield and productivity increased by two points percent and 14.87 %, respectively.     

混合铁矿粉的烧结基础特性

 对邯钢5种常用矿粉及其混合矿的烧结基础特性进行了研究。结果表明：巴粗矿粉对混合矿的同化温度和液相流动性的影响最大,澳矿粉对混合矿的粘结相强度影响最大。以粘结相强度为基准,综合考虑同化温度和液相流动性,邯钢最优配矿方案为：澳矿粉(30%~35%)+邯邢精粉(15%~20%)+巴粗矿粉(20%~25%)+杨迪粉(10%~15%)+北非粉(5%~10%);混合矿中单种矿的烧结基础特性之间存在一定的互补关系,但混合矿烧结基础特性不能简单地由单种矿烧结基础特性的线性加和来确定。     

Mixed State and High Effective Utilization of Pilbara Blending Iron Ore Powder

 Pilbara blending iron ore powder (PB powder) is blending ores with good and poor quality iron ores, so how to use PB power effectively is a problem. The self-characteristics of PB powder and its single-components were studied respectively, such as the macroscopic properties, microscopic properties, and high-temperature properties; the behavior and effect in the sintering were mastered. Then based on the new ore-proportioning idea of iron ores sintering characteristics complementary, the principles on the effective use of PB powder were discussed, and was further validated through the sintering pot test and industrial production. The results show that: PB powder is composed of three kinds of iron ore, and the sintering characteristics of different iron ores are obviously discrepant. With the ore-proportioning optimization based on the iron ores sintering characteristics complementary, the proportion of PB iron ore powder can be increased to more than 45%.     

褐铁矿在烧结工艺中的优化配置

为了探究全进口矿条件下褐铁矿在烧结工艺中的合理配置,实现褐铁矿的高效利用以进一步提铁降本,针对S钢铁公司500 m2大型烧结机实际原燃料条件,基于试验用铁矿粉的常规理化性能和高温烧结基础特性开展了不同褐铁矿配比的烧结杯试验研究,结合Factsage 7.1热力学软件,模拟计算了不同褐铁矿配比条件下的黏附粉含量和理论液相生成量及性能,并采用矿相显微镜分析了烧结矿的显微结构,探明了褐铁矿与赤铁矿和磁铁矿的优化搭配规律。研究表明:澳大利亚褐铁矿具有粒度粗、矿化能力弱,同化温度低、黏结相强度差、吸液性强的特点,当褐铁矿质量分数由45%增加至55%时,提高磁铁精矿OD矿的质量分数至15%,同时降低OC矿质量分数至10%,烧结矿转鼓强度和低温还原粉化性能等指标达到最优,这是由于一方面提高磁铁精矿配比不仅具有增加黏附粉比例、改善液相生成数量和性能的作用,而且可以均匀液相分布,消除过熔现象;另一方面,增加磁铁精矿配比可以改善烧结料球的粒度组成,减少褐铁矿吸液量,提高烧结矿强度。因此,在高褐铁矿配比条件下,增加适宜的磁铁精矿配比有利于稳定烧结矿质量,全面改善烧结矿性能。      

高比例褐铁矿与细磁精矿粉配矿技术研究

在对褐铁矿-扬迪矿的性能进行了理、化、热力学性能分析研究的基础上,与太钢自产超细磁铁精矿粉尖山粉进行了合理配矿,经过大量的烧结杯试验和烧结矿冶金性能检测,优化出了适宜的配比方案,开发出了超细磁铁精矿粉与高比例褐铁矿配矿烧结技术,应用于生产实践,并实施了有利措施,烧结料层透气性得到了改善,烧结矿产质量指标保持在较好水平,配矿成本大大降低,取得了很好的应用效果。     

铁矿石高温烧结基础特性评价方法的国外研究进展

 随着全球优质铁矿石日益减少、资源禀赋变差,国内外钢厂普遍面临着烧结原料供应不稳定、铁矿石性质波动大、原料结构频繁变化等问题,对烧结生产、高炉冶炼和产品质量产生了极大的不利影响。因此,开展铁矿石烧结性能评价研究具有重要的现实意义。铁矿石烧结基础特性可分为冷态特性和高温特性两大类,前者主要包括铁矿石的化学成分、粒度组成、矿物学特性等常温性质,后者主要包括铁矿石的同化性能、液相生成特性等高温成矿行为及实际烧结性能。概述了国外关于铁矿石高温烧结基础特性评价方法的研究进展,系统归纳了不同研究机构提出的评价指标和试验方法。已有研究表明,现有基于团块烧结法的评价方法虽然对铁矿石不同的烧结行为分别进行了深入研究,但未能在其与铁矿石的实际烧结性能之间建立起准确可靠的关系,主要原因在于,对影响铁矿石实际烧结性能的最关键因素把握不准,同时对烧结过程的模拟性有待提高。因此,揭示铁矿石基础特性与其烧结性能的内在联系,首要前提在于必须深入研究和把握“铁矿石-制粒物料-烧结矿”不同阶段物料性质的传递规律,查明影响铁矿粉烧结过程的主要因素,这对找准高温烧结基础特性研究的切入点具有十分重要的意义。     

添加巴西MRB矿对烧结影响的试验研究

在实验室条件下,以模拟生产现场的方式,研究了添加巴西MBR矿代替部分武钢自产精矿对烧结技术经济指标及烧结矿冶金性能的影响。结果认为,添加10％MBR矿对烧结指标基本无影响,配比增至15％时,部分指标开始变坏,配比大于15％以后,各项指标及冶金性能明显变差。     

配加巴西粗粉和精粉的烧结试验

本文主要介绍了在济钢烧结厂进行的巴西粗粉与澳粉、表粉与国内精粉的烧结对比试验，并对试验结果进行了分析及效益计算，最后提出，在的料价格下进口巴西粗份，在技术上可行的，在效益上是合算的。并建议集中资金进口巴西粗粉。     

对进口铁矿石评价的新法初探

介绍了对进口铁矿石评价的传统方法及其存在的问题。提出了一种新的“硅平衡单烧”评价法，并结合马钢的原料状况，用新评价法对7种进口铁矿石从烧结和冶金性能两个方面进行比较。结果表明，巴西A粉矿、C粉矿、澳D矿应为首选配用矿种；B粉矿的综合性能稍差于A粉矿；E、G矿的配入量不宜过高；F粉矿的综合性能较差，应适当减少其配用量。     

高钒钛磁铁精矿配比烧结强化的研究

在烧结配加较高配比的攀精矿时,烧结矿产量、质量下降,为研究强化烧结的措施,采用烧结杯开展了试验研究。通过优化原料结构、强化制粒、强化低温成矿等试验,得出攀精矿配比55%~58%时切实可行的强化技术措施:1)添加1.2%左右的生物质B或1.6%左右的生物质D;2)添加0.2%左右的复合粘结剂B或1.0%左右的复合粘结剂LF;3)添加1.5%左右的液态粘结剂1号;4)用FMG替代澳矿。综合比较,在攀精矿配比55%~58%的条件下,采取添加1.0%左右的复合粘结剂LF或1.6%生物质燃料D进行强化烧结,可以稳定提高烧结矿产量、质量。     

铁矿粉烧结优化配矿的试验

 基于微型烧结试验,测定、比较和分析了国内某钢厂烧结生产常用6种铁矿粉的同化性和液相流动性等高温特性及其影响因素,进而根据其高温特性提出相应互补优化配合原则,设计了4组烧结优化配矿方案并进行了烧结杯试验。结果显示,优化配矿方案的烧结矿产量、质量指标均比基准方案优良,烧结成本比基准方案低,这表明基于铁矿粉同化性和液相流动性对所研究的6种铁矿粉能够进行有效的优化配矿,也为该钢厂烧结优化配矿提供了理论依据和技术支持。     

大量使用低价矿的MEBIOS技术及其进展

日本钢铁企业为了应对铁矿资源劣化的趋势和降低生产成本,近年来不断提高澳大利亚豆矿和马拉曼巴铁矿粉在烧结中的配比.为了在大量提高低价矿配比的情况下生产出优质低渣比烧结矿,提出了MEBIOS技术,并进行了大量实验室基础性研究.本文就MEBIOS的工艺特点,以及关于生球团成分设计、烧结料层透气性与产率影响因素、烧结矿还原性影...     

Comparison of sintering performance of typical specular hematite ores with distinct size distributions

The sintering performance of three typical specular hematite ores (coarse SO-A, intermediate SO-B and ultrafine SO-C) was compared in an industrial ore blend through pilot-scale sinter pot tests. The effect of particle size of specular hematite ores on their granulation and sintering performance was revealed. Compared with the coarse SO-A fine and ultrafine SO-C concentrate, the intermediate SO-B showed inferior granulation and sintering performance characterized with poorer bed permeability and productivity, lower sinter strength and higher fuel rates. A new material preparation method was hence proposed and verified at both pilot and industrial scales. The proposed method by mixing SO-B with a high amount of goethite-type iron ore fines was found to be an effective way in improving the granulation and assimilative characteristics of ore blend comprising 31% intermediate SO-B, leading to improved sinter productivity and lowered fuel rates. The metallurgical properties and microstructure of sinters were also investigated. The sinters obtained through the proposed preparation method were generally stronger and more reducible on account of better sinter structure with more relict hematite ultimately connected with needle-like silico-ferrite of calcium and aluminum and lower porosity.