高镁质球团矿的生产实践

烧结矿中MgO含量的提高,烧结成品率、垂直烧结速度、转鼓指数,机械强度均出现降低的现象,提高MgO含量对改善烧结矿的产量、质量十分不利。将烧结矿中Mgo转移到球团矿中,可以提高烧结矿质量,改善烧结矿冶金性能;同时球团矿中MgO可以形成镁橄榄石和偏硅酸镁等高熔点相,提高球团矿的冶金性能。通过实验室实验,结合工业试验,确定了配加不同配比镁质添加剂与皂±的造球混合料指标、生球指标、竖炉操作制度,为生产高镁质球团矿提供了保障,高炉配加高镁质球团矿后,综合炉料冶金性能明显改善,将球团矿与烧结矿在软熔温度区间上的差异缩小,利于高炉软熔带厚度的减薄,利于高炉透气性提高及高炉软熔带的下移。对于高炉壁面温度的稳定、热负荷的降低以及扩大间接还原有有利影响,对高炉炉况的稳定、燃料消耗的降低有明显促进作用。     

基于适宜镁铝比的MgO添加方式及实效研究

基于适宜镁铝比的三段式精细化控制方针,提出了烧结-球团-高炉等工序中协同优化-功效最大化的MgO添加方式:①采用烧结矿工艺添加细磨含MgO熔剂的粒度的方法,制备低MgO优质烧结矿;②对菱镁石进行活化焙烧处理,制备含MgO优质球团矿;③若烧结矿或球团矿带入高炉内的MgO,不能满足高炉炉渣对MgO的需求,可采用与煤粉共同风口喷吹方法进行补充添加。实践表明,适宜镁铝比操作具有显著的经济效益与社会效益。     

高炉高(MgO)渣性分析及炉料结构优化探讨

针对近年来昆玉钢铁高炉在使用高MgO炉料配比存在的问题及高炉生产状况,开展了高炉高(MgO)渣性能研究及高MgO炉料性能及结构协同优化。认为昆玉高炉炉料结构应依据现有生产装备及进口高MgO铁矿资源条件下,合理调配高MgO精矿在烧结与球团中的比例,逐步实现以高碱度低MgO烧结矿配加高MgO酸性球团矿的综合炉料,在满足高炉炉况稳定顺行的基础上,提高高MgO铁精矿使用量,达到炉料结构功效最大化,生铁成本最优。     

安钢高炉低烧结矿比例炉料结构合理配置的试验研究北大核心

对不同碱度烧结矿、不同碱度球团矿、块矿,以及混合炉料结构进行了高温冶金性能试验,结果表明,安钢高炉采用烧结矿+块矿+酸性球团矿+碱性球团矿的四元结构模式,炉料结构的高温冶金性能得到了显著改善。碱性球团矿还原性能和高温冶金性能明显好于酸性球团矿,与烧结矿搭配;可以改善高炉顺行条件,降低燃料消耗。从稳定和改善炉料的高温冶金性能出发,配加20%及以上比例的碱性绘团矿是低烧结矿比例炉料结构的合理配置。     

我国高炉炉料结构的进步

对我国高炉普遍采用的几种主要炉料结构形式(如高碱度烧结矿搭配酸性球团矿、高碱度小球烧结矿配加酸性球团矿、高碱度烧结矿配加酸性烧结矿等)进行了分析,并对合理炉料结构的原则进行了阐述。     

萍钢高炉原料冶金性能及合理炉料结构的研究

一、前言 七十年代以来,各国炼铁工作者开始重视高碱度烧结矿的应用和高炉合理炉料结构的选择。日本高炉炉料中高碱度烧结矿的比例自后逐年有所增加,块矿和酸性球团矿的配比约各占10～20％;苏联一向以烧结矿为主,使用球团矿的比例极低、七十年代以来,不少高炉也开始采用球团矿作为炉料的一部分,目前炉料中球团矿一般已占20～30％;西德高炉的炉料以烧结矿为主,使用酸性球团矿的比例也在20～30％;美国高炉     

我国烧结矿中MgO含量变化现状及发展趋势

在烧结工艺过程中,MgO对烧结矿的冶金性能具有重要影响。随着烧结原料条件的变化及炼铁新技术的发展,烧结矿中适宜的MgO含量也随之改变。介绍了烧结矿的来源及作用机理,系统地分析了原料条件和炼铁新工艺对我国烧结矿中MgO含量的影响。相较传统的高碱度烧结矿+酸性球团矿的炉料结构,低MgO烧结矿+镁质球团矿结构下的高炉焦比、燃料比及渣比都有所降低,是未来炼铁的发展方向。     

对高炉炉料结构合理化的看法

本文列举了当今世界高炉炉料结构的主要形式,通过对我国重点企业不同炉料结构冶炼指标进行分析比较以及对我国高炉炉料结构合理化过程的回顾,阐明了高碱度烧结矿加酸性球团矿是我国当前合理的炉料结构。明确提出高炉炉料结构合理化的衡量标志和实现炉料结构合理化的途径。通过展望世界主要产钢国家炉料结构的近况,进一步指出高碱度烧结矿加酸性球团矿的炉料结构有广阔的发展前途。     

高镁球团改善炉料结构理化性能的实验研究

实验发现,添加MgO能很好地改善球团矿的高温冶金性能。随着MgO的增加,球团矿的高温还原度和软熔滴落性能得到改善,且低温还原粉化率和膨胀率均有明显下降。但与此同时,当球团矿镁含量上升时,其抗压强度、落下强度下降得比较明显。因此在高炉中配加含MgO球团时,需要综合考虑高MgO球团的理化性能对炉料结构影响。该结果实际运用于某厂的球团生产,为其高炉炉料中添加高镁球团提供了理论基础和技术支持。     

我国高炉合理炉料结构探讨

根据我国各钢铁厂的不同情况和不同矿源分析了高炉的合理炉料结构。认为有自产铁精矿的钢铁厂的高炉合理炉料结构应该是高碱度烧结矿加球团矿，所需球团矿应该用自产铁精矿来生产；主要吃进口铁矿的钢铁厂的高炉炉料结构应该是高碱度烧结矿加块矿(或再加球团矿)；独立矿山所产铁精矿应该加工成氧化球团矿，以满足国内高炉对酸性炉料的需要，这样做对矿山和钢铁厂都有利。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.