Rules of Assimilation of Single Ore and Mixed Ores

Assimilation behaviors of 7 kinds of iron ores from Australia, Brazil, India, South Africa and China were evaluated and analyzed. On the basis of that, four ore blending principles were proposed, and seven groups of iron ore powder blending schemes were designed. The ores of different types or from different places are shown apparently different in assimilation. The assimilation of hematite in Australia, Brazil and India is relatively high, but the assimilation of magnetite in South Africa and China and specularite in China is relatively low. The assimilation of the ores has negative correlation with MgO content and binary basicity, while the assimilation of the ores has positive correlation with porosity, SiO₂ and Al₂O₃ contents, and crystal water. The iron ores with smaller crystal size and microstructure looseness have relatively higher assimilation. Assimilation of mixed ores has relationship of linear, arch and “S” types to the ratio of single iron ore powder. When the charge ratio of ore is less than 25%, it possesses additivity, providing theoretical basis for optimization of ore matching.     

高铝铁矿和高锰铁矿共还原行为的研究

高铝铁矿和高锰铁矿是两种储量丰富但又极难分选的铁矿资源,实现铁、锰、铝的高效综合利用具有重要意义.本文研究了这两种铁矿石工艺矿物学,考查了单矿种及两者的混合矿种的直接还原行为及还原过程中的矿物组成演变,揭示了相应的还原机理.结果表明:高铝铁矿难还原,其机理为经还原后仅部分铁氧化物转化为金属铁,其余的铁与铝、硅矿物形成难还原的铁橄榄石和铁尖晶石;高锰铁矿易还原,其中的铁氧化物大部分被还原成金属铁,锰氧化物与铝、硅矿物结合形成锰尖晶石和锰橄榄石,促进了铁氧化物的还原.而且在相同还原条件下,高锰铁矿球团金属化率比高铝铁矿高30个百分点,前者还原性明显优于后者.两种矿进行共还原,当高锰铁矿配比达到60%时,球团金属化率就可大于90%.锰氧化物的存在对高铝铁矿石中铁氧化物的还原具有显著的促进作用.     

STRATEGIES FOR PROCESSING LOW-GRADE IRON ORE MINERALS

The conventional routes for making iron and steel require that the ore be upgraded through a series of physical separation processes in sequence. The unit operations involved include crushing, grinding, separation, dewatering, pelletization, blast furnace processing, and basic oxygen furnace processing. This complex sequence is not cost effective for many low-grade ores that are resistant to physical concentration. For example, many ores contain iron oxide in a nonmagnetic form and are so fine-grained that it is uneconomical to grind them to a fine enough size to separate the iron oxides from the gangue. Exploitation of these iron minerals needs to take a different approach, using fewer process steps than are required for conventional ironmaking. Results are presented showing that it is possible to produce metallic iron directly from low-grade ores. The metal is in a form that can be easily separated to produce a high-grade iron product, and the iron recovery is greater than can be achieved from difficult-to-process ores by conventional means.     

X射线荧光光谱在矿石分析中的应用评介—总论

矿石因其种类繁多、成分复杂和元素含量差异悬殊而成为地质分析的一大难题。作者收集各类矿石分析方法文献726篇,在此基础上主要以列表方式按黑色金属、有色金属、稀有稀土稀散金属、能源矿产和非金属矿石5大类介绍了X射线荧光光谱(XRF)分析在数十种矿石中应用的文献概况,从分析方法研究的基础条件和各类矿石分析方法类型、特点和文献量等进行了介绍和评介,也依据XRF分析仪器及技术的发展和目前在我国矿石分析中的应用现状提出了XRF在各类矿石分析中更广泛应用的发展建议。其中的黑色金属矿石包括铁矿石、锰矿石、铬铁矿及钛铁矿石和钒钛磁铁矿石,涉及文献177篇;有色金属矿石包括铝土矿石、钴镍铜铅锌矿石、钨钼矿石、锡锑铋汞矿石和多金属矿石,涉及文献186篇;稀有稀土稀散金属矿石包括稀土、铌钽、锆石和稀散金属矿石,涉及文献67篇;能源矿产包括煤、煤灰、石盐和油页岩,涉及文献40篇;非金属矿石包括碳酸盐类、磷酸盐类、硫化矿及硫酸盐类、氟化物矿石、镁及硅镁酸盐类、硅及硅铝酸盐类、岩盐卤水类和宝玉石9类非金属矿石,涉及文献257篇。作为矿石分析总论旨在以文献为基础框架展现XRF分析技术在我国各类矿石分析应用的基本概况,给读者一个全貌。而对XRF在各矿种矿石分析中应用的更具体评介将陆续发表,XRF在铁矿石、铬铁矿石和铜矿石分析中的应用评介已于2019年刊于《冶金分析》。     

X射线荧光光谱在矿石分析中的应用评介—总论

矿石因其种类繁多、成分复杂和元素含量差异悬殊而成为地质分析的一大难题。作者收集各类矿石分析方法文献726篇,在此基础上主要以列表方式按黑色金属、有色金属、稀有稀土稀散金属、能源矿产和非金属矿石5大类介绍了X射线荧光光谱(XRF)分析在数十种矿石中应用的文献概况,从分析方法研究的基础条件和各类矿石分析方法类型、特点和文献量等进行了介绍和评介,也依据XRF分析仪器及技术的发展和目前在我国矿石分析中的应用现状提出了XRF在各类矿石分析中更广泛应用的发展建议。其中的黑色金属矿石包括铁矿石、锰矿石、铬铁矿及钛铁矿石和钒钛磁铁矿石,涉及文献177篇;有色金属矿石包括铝土矿石、钴镍铜铅锌矿石、钨钼矿石、锡锑铋汞矿石和多金属矿石,涉及文献186篇;稀有稀土稀散金属矿石包括稀土、铌钽、锆石和稀散金属矿石,涉及文献67篇;能源矿产包括煤、煤灰、石盐和油页岩,涉及文献40篇;非金属矿石包括碳酸盐类、磷酸盐类、硫化矿及硫酸盐类、氟化物矿石、镁及硅镁酸盐类、硅及硅铝酸盐类、岩盐卤水类和宝玉石9类非金属矿石,涉及文献257篇。作为矿石分析总论旨在以文献为基础框架展现XRF分析技术在我国各类矿石分析应用的基本概况,给读者一个全貌。而对XRF在各矿种矿石分析中应用的更具体评介将陆续发表,XRF在铁矿石、铬铁矿石和铜矿石分析中的应用评介已于2019年刊于《冶金分析》。     

铁矿石产品等级的划分标准研究

在全面分析研究国内外铁矿石产品品质的基础上,提出了铁矿石产品等级的划分标准,包括块矿、粉矿和精矿产品,不包括烧结矿和球团矿产品,同时确定了铁矿石产品的化学成分测定方法。     

某选铁尾矿回收云母选矿试验研究

我国许多钢铁矿山企业铁矿石中伴生有云母,但在选铁过程中通常将其作为脉石矿物而随尾矿排放。某铁尾矿通过脱泥-碱性浮选选矿工艺研究可以回收产率10.17%,云母矿物含量96.19%的高纯度云母,有效地回收其中的云母资源,降低了尾矿排放量,具有良好的经济效益和社会效益。     

铁矿石中全铁含量分析的研究进展

对目前铁矿石中全铁含量的检测方法包括化学分析法、仪器分析法以及微量滴定法等进行了全面的分析和阐述。比较了不同化学分析法中还原方式、滴定剂等的差异以及对检测结果稳定性和准确度的影响, 分析了铁矿石中全铁含量测定常用的仪器分析法即电位滴定法和X射线荧光光谱法的发展和改进, 介绍了近年来新兴的微量滴定法在铁矿石中全铁含量测定中的应用。对不同方法的优势和不足进行了比较和评价, 为进一步发展和完善铁矿石中全铁含量检测的新方法提供了参考和依据。     

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。     

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.     

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%.     

Tin and zinc separation from tin,zinc bearing complex iron ores by selective reduction process

Abstract

Tin, zinc bearing complex iron ores are typically intractable and have not been efficiently utilised in China. In this investigation, the process mineralogy of the tin, zinc bearing iron ores and reduction behaviours of iron, tin and zinc oxides by CO were investigated. A selective reduction roasting process was initially developed to separate tin and zinc from the complex iron ores. Under optimum conditions, most of the tin and zinc were effectively removed from the iron ore pellets, and the roasted pellets could be used as high quality ironmaking burdens for large scale blast furnaces.     

广东口岸进口铁矿石质量情况分析

介绍了2003～2005年度广东口岸进口铁矿石业务基本概况和品质检验情况，并对各进口国在铁矿石品种、检测项目等方面作出了全面质量分析，最后针对铁矿石进口市场秩序、质量状况等方面问题提出一些具体建议．     

不同类型铁矿石的低温还原粉化特征

以炼铁厂常用烧结矿、球团矿以及块矿为研究对象,考察了不同含铁原料在高炉炼铁工艺和COREX非高 炉炼铁工艺2种煤气条件下的低温还原粉化行为。研究结果表明:①铁矿石的结构组成决定了其粉化形式,块矿 和烧结矿的粉化形式均表现为“裂开式”,粉化产生的细小粒级颗粒较均匀地分布于-6.3 mm范围;不同于烧结矿 和块矿,球团矿则属于“剥落式”粉化,粉化产物粒径主要集中在-0.5 mm范围;②在还原气氛和温度相同的情况 下,烧结矿粉化程度最高,球团矿次之,块矿最低;③还原温度对3种含铁炉料的还原粉化程度均具有重要影响,当 还原煤气条件相同时,3种含铁炉料的低温还原粉化指数均在550℃时达到最大值;④COREX炼铁工艺的煤气条 件加剧试验用铁矿石的低温还原粉化程度,但对不同类型铁矿石的影响有所差异,综合粉化产生的细小颗粒的增 幅可知,块矿受其影响程度较大,其次是球团矿,而烧结矿对煤气性质改变的敏感性最小。     

Influence of Iron Ore Characteristics on FeO Formation During Sintering

  The influence of iron ore characteristics on FeO formation during sintering was examined mainly in terms of chemical composition and the melting characteristics of iron ores. Statistical regression and X ray diffraction were used to further explain the specific effect of iron ore characteristics on FeO formation. The results indicate that LOI (loss on ignition) in iron ores have a positive influence on FeO formation by promoting the sintering process of Fe2O3 decomposing and reducing. Silica contents in iron ores play a determining role in final content of FeO in sinter. The melting characteristics of iron ores significantly affect FeO formation during sintering.     

基于不同炼铁工艺的铁矿石低温还原粉化特征

 为改善铁矿石在炉内的低温还原粉化性能以适应多样的炼铁生产条件,以炼铁生产常用的烧结矿、球团矿以及块矿为研究对象,通过控制还原气体成分和温度的方式,考察并比较了不同种类铁矿石在高炉炼铁工艺和COREX非高炉炼铁工艺2种煤气条件下的低温还原粉化行为。试验结果表明,相同的还原气氛和温度条件下,烧结矿、球团矿以及块矿的还原粉化形式、程度有较大差异,而各类铁矿石对煤气性质、温度变化的敏感性也各不相同。这对更为全面地考察和评价不同类型铁矿石的低温还原粉化特征,进而改善铁矿石冶金性能和优化炼铁工艺参数具有一定的实用性和参考价值。     

XRF光谱法测定铁矿石中的Al2O3

介绍采用X射线荧光光谱粉末压片法测定铁矿石中AL2O3从待测试样中选取一批试样,经ICP及化学分析法多次定值后,在X荧光光谱仪上绘制Al2O3的光谱强度值与Al2O3质量百分含量的工作曲线.此方法减少了不同矿种带来的基体影响.准确度和精确度都满足生产分析的需要.     

单种铁矿性能评价体系的设计与开发

针对国内外各种铁矿石性能差异较大的现状,为了更合理有效地评价和利用各种铁矿资源,将单种铁矿分为块矿、球团矿、富矿粉和精矿粉4种类型,并根据提供的铁矿数据设计了简易型和科学型2种评价模型,建立单种铁矿性能综合评价体系。结合某钢厂的烧结、炼铁生产实际参数,采用Visual Studio开发模型软件,对各种铁矿石做出快速、定量的综合评价,直接计算出最佳的采购参考价格。经企业应用表明,模型计算结果准确度高,为降低炼铁成本,提高生产效率提供了理论和技术依据。     

ICP测定铁矿石中Mn含量的测量不确定度评定

对ICP测定铁矿石中Mn元素的测量不确定度的产生原因进行分析，并对铁矿石试样中Mn含量的测定结果的不确定度进行评定。     

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...