褐铁矿烧结合理工艺参数的研究

本文对褐铁矿烧结的合理工艺参数进行了研究,结果表明：褐铁矿烧结适合较低的负压,燃料配比和水分值都有个合适值,并且合适水分和燃料值随褐铁矿配比的增加而增加。随着烧结矿碱度的提高,在任何褐铁矿的配比下,烧结的各项指标和烧结矿强度都随之变好,这是因为碱度的提高使得烧结矿中的铁酸钙增加,烧结矿的还原性、转鼓强度和成品率都得到了改善。     

承钢钒钛磁铁精矿烧结工艺参数的正交试验研究

承钢烧结生产目前主要以钒钛磁铁精矿为含铁物料,但其成品烧结矿强度低、低温还原粉化严重。针对这一问题,通过烧结杯试验研究了烧结矿碱度、混合料燃料配比、烧结矿MgO含量和混合料水分等工艺参数对烧结矿机械强度和低温还原粉化的影响,得出了承钢在当前原燃料条件下合理的烧结工艺参数为碱度2.6,燃料配比4.5%,烧结矿中MgO质量分数4.0%,混合料水分7.5%。为实际生产提供了理论依据。     

烧结矿适宜的SiO2质量分数和碱度

 研究了烧结矿适宜的SiO2质量分数和碱度,用来指导生产具有良好经济技术指标的烧结矿。首先对青钢烧结用铁矿粉进行了基础性能分析,并结合青钢烧结矿生产实际采用烧结杯进行试验,设计了4种SiO2质量分数和3种碱度,研究SiO2质量分数和碱度对烧结生产经济技术指标的影响。研究结果表明,烧结矿二元碱度为1.9,SiO2质量分数为5.4%时,烧结杯试验能取得良好的经济技术指标。借助扫描电镜（SEM）对烧结矿微观结构进行观察,发现随着SiO2质量分数的增加,烧结矿内液相量和溶蚀结构逐渐增多,烧结矿化学成分均匀化,但SiO2质量分数达到5.7%时,烧结矿内硅酸盐类物质过分发展,反而使得烧结矿质量劣化。碱度的提高有利于铁酸钙的发展和黏结相比例的增加,从而提高烧结矿还原性,改善烧结矿质量,但碱度为2.0时也存在玻璃质增多的现象。     

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。      

越南太钢褐铁矿的烧结研究与生产实践

邯钢援助越南太原钢厂进行烧结机改造,并针对越南太钢的烧结机进行了越南褐铁矿烧结试验研究,通过不同褐铁矿配比烧结试验,并分析了试验结果,结合褐铁矿烧结性能,找出了合适的生产工艺参数,并成功的应用在越南太钢实际生产中。褐铁矿配比达到3 7 . 7%,并且利用系数达到1 . 2 6t/ (m2 ·h)。     

高配比褐铁矿烧结工艺优化试验研究

褐铁矿富含结晶水且易于熔融,高配比褐铁矿烧结过程要求的原料水分及焦粉用量略高。针对两种典型褐铁矿原料,开展烧结工艺优化试验研究,结果表明:烧结含铁原料中褐铁矿配比可提高至60%;在混合料水分为9.0%、焦粉用量为4.5%的条件下,获得的烧结矿成品率为73.92%,利用系数为1.24 t/(m~2·h),固体燃料消耗为64.14 kg/t,转鼓强度为61.86%;烧结矿高温冶金性能良好,符合高炉原料的要求。     

新疆菱铁矿烧结试验研究

通过对新疆菱铁矿的烧结试验研究得出：新疆菱铁矿铁品位较低,CaO质量分数超高,达到7.87%,SiO2质量分数很低,只有0.79%。因此以新疆菱铁矿为主要原料进行烧结,为达到高炉生产所需要的碱度,就需配加适量的硅石或含SiO2较高的矿粉。烧结矿燃料配比为5.2%~5.6%,转鼓指数可达到56%～57%,可用于中、小高炉冶炼。     

烧结工艺参数对混合矿黏结相强度的影响

采用微型烧结设备研究了烧结温度、碱度和MgO含量对高褐铁矿配比混合矿黏结相强度的影响,结果表明：随着烧结温度、碱度、MgO含量的增加,黏结相强度先升高后降低,当烧结温度为1280℃、碱度为1.6、MgO质量分数为2.0%时,高褐铁矿配比混合矿的黏结相强度最高。生产中应适当降低褐铁矿的配比,保证混合铁矿粉具有足够的黏结相强度。     

高配比褐铁矿的烧结试验研究

通过对改变碱度试验、SiO2含量试验、SiO2与MgO含量试验、不同的褐铁矿粒度和熔剂分加等试验的研究和分析,优化出了高配比褐铁矿条件下合理的工艺操作参数,并找出了高配比褐铁矿下烧结指标的变化规律。试验结果表明,褐铁矿粒度对烧结指标的影响比较大。在褐铁矿的上限粒度为12mm时,不仅可以获得较高的生产率,而且烧结矿强度指标完全可以满足高炉的需要。     

北钢炼铁厂360m~2烧结机配加褐铁矿的实践

北钢炼铁厂360 m2烧结机通过调整操作参数,适当提高混合料水分、焦煤粉配比和烧结料层厚度,将火箭粉、扬迪粉、PB粉等褐铁矿配比逐步提高到45%左右,其产量、质量达到了国内同类型企业的先进水平,既充分利用了矿粉资源,又降低了烧结矿成本,为同类型企业烧结配加褐铁矿提供了宝贵的经验。     

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.