冀东磁铁精粉球团矿的矿相结构研究

对冀东磁铁精粉球团矿的矿相结构进行了系统的研究。结果显示,冀东磁铁精粉焙烧球团矿的主晶相是赤铁矿,焙烧制度和预热制度都影响球团矿的显微特征,当球团矿预热温度950~1 000℃、预热时间20 min时,球团中Fe3O4基本完全氧化,Fe2O3再结晶明显,晶粒开始凝聚。当焙烧温度在1 300℃以上时球团矿有分解型Fe3O4出现,所以焙烧温度应选择在1 300℃以下较为合适。在焙烧温度1 250~1 275℃、焙烧时间大于20 min条件下,球团的抗压强度大于2 000 N/个。     

PMC精矿配加司家营矿粉球团焙烧机理

 针对PMC矿的利用问题,对PMC精矿与司家营矿粉以7[∶]3配矿比例造球的氧化焙烧行为进行了研究。研究结果表明,当预热时间为10 min、焙烧温度为1 275 ℃、焙烧时间为20 min时,球团抗压强度随预热温度的升高呈现先升高后降低的趋势,当预热温度为925 ℃时,球团抗压强度达到最大为2 765.75 N/个;当预热温度为925 ℃、焙烧温度为1 275 ℃、焙烧时间为20 min时,球团抗压强度随预热时间的延长由2 64升高到2 833.61 N/个;当预热时间为15 min、预热温度为925 ℃、焙烧时间为10 min时,球团抗压强度随焙烧温度的升高由674.96升高到2 503.83 N/个;当预热时间为15 min、预热温度为925 ℃、焙烧温度为1 300 ℃时,球团抗压强度随焙烧时间的延长由2 503.83升高到2 872.52 N/个。     

西澳超细粒磁铁精矿特性及其对球团焙烧性能的影响

本文采用圆盘造球机及DSC、TG分析手段对西澳超细粒磁铁精矿和国产磁铁精矿动态成球性及氧化特性进行了研究,并对西澳超细粒磁铁精矿及配加国产磁铁精矿的球团焙烧特性进行了研究。结果表明,单一西澳超细磁铁精矿比表面积高、氧化放热反应温度低,球团焙烧时易形成双层结构,导致球团焙烧性能较差。当配加40%国产磁铁精矿时,球团适宜预热温度由1 050℃降低到950℃,适宜的焙烧温度由1 300℃降低到1 250℃,焙烧时间由40min缩短到15min;而且焙烧球团矿的抗压强度由2 313 N/个提高到2 746 N/个。焙烧球团矿的矿相研究表明:配加国产磁铁精矿后,焙烧球团矿微观结构得到明显改善,赤铁矿再结晶良好。优化配矿是改善西澳超细粒磁铁精矿球团矿焙烧特性的有效途径之一。     

优化配矿强化西澳超细粒磁铁精矿球团焙烧研究

进行了西澳超细粒磁铁精矿分别配加国产磁铁精矿和巴西赤铁精矿制备氧化球团矿的实验研究.结果表明,以100%西澳超细磁铁精矿为原料制备氧化球团矿时,球团预热及焙烧性能较差,在预热温度为1050℃、预热时间20 min及焙烧温度1300℃、焙烧时间40 min的条件下,预热球团和焙烧球团矿抗压强度分别为每个502和2313 N.西澳超细粒磁铁精矿配加40%国产磁铁精矿或20%巴西赤铁精矿时,球团适宜预热温度由1050℃分别降低到950和975℃,适宜的焙烧温度由1300℃分别降低到1250和1280℃;而且焙烧球团矿的抗压强度分别提高到每个2746 N和每个2630 N.焙烧球团矿的微观结构研究表明：配加国产磁铁精矿后,焙烧球团矿中Fe₂O₃晶粒发育优良,晶粒间互联程度提高,晶粒粗大,孔隙率低,固结更加紧密.配加20%巴西赤铁精矿时,焙烧球团矿中Fe₂O₃晶粒基本连接成片,Fe₂O₃晶体发育良好.优化配矿是改善西澳超细粒磁铁精矿球团矿预热及焙烧性能的有效途径.     

马钢球团配用黏性姑精矿实验研究

为了解决黏性姑山赤铁精矿(姑精矿)用于烧结生产引起烧结质量指标降低,球团生产混合料难以混匀,球团质量变差,生产波动大等问题,开展了将姑山磁铁精矿B精、C精和姑精矿在矿浆状态下预先混匀成姑山混合精矿实验,并研究了姑精矿粒度、配比等因素对生球制备、球团预热焙烧制度和球团性能的影响。结果表明:在矿浆状态下混匀可使姑精矿在姑山混合精矿中分布均匀,添加姑精矿润磨后,造球混合料细粒级含量增加,姑精矿较磁铁精矿润磨性能好;使用造球混合料2号造球,生球落下强度为7.8次/(0.5 m),较磁铁精矿生球落下强度提高1.3次/(0.5 m)。在预热温度950℃、预热时间18 min、焙烧温度1 200℃、焙烧时间20 min时,焙烧球团强度为2 987 N/球,较磁铁精矿混合料焙烧球团强度降低129 N/球,姑精矿的加入对球团的焙烧强度不利。生产中可以通过适当提高焙烧温度或姑精矿细度的措施来满足高炉对球团强度的要求。     

马钢球团配用黏性姑精矿实验研究

为了解决黏性姑山赤铁精矿(姑精矿)用于烧结生产引起烧结质量指标降低,球团生产混合料难以混匀,球团质量变差,生产波动大等问题,开展了将姑山磁铁精矿B精、C精和姑精矿在矿浆状态下预先混匀成姑山混合精矿实验,并研究了姑精矿粒度、配比等因素对生球制备、球团预热焙烧制度和球团性能的影响。结果表明:在矿浆状态下混匀可使姑精矿在姑山混合精矿中分布均匀,添加姑精矿润磨后,造球混合料细粒级含量增加,姑精矿较磁铁精矿润磨性能好;使用造球混合料2号造球,生球落下强度为7.8次/(0.5 m),较磁铁精矿生球落下强度提高1.3次/(0.5 m)。在预热温度950℃、预热时间18 min、焙烧温度1 200℃、焙烧时间20 min时,焙烧球团强度为2 987 N/球,较磁铁精矿混合料焙烧球团强度降低129 N/球,姑精矿的加入对球团的焙烧强度不利。生产中可以通过适当提高焙烧温度或姑精矿细度的措施来满足高炉对球团强度的要求。     

钒钛磁铁精矿球团低温焙烧参数研究

针对米易球团厂链篦机-回转窑球团生产线投产初期焙烧温度偏高带来的一系列问题,研究了预热温度、球团粒径、氧化气氛对钒钛磁铁精矿球团氧化率的影响。通过提高球团粒度均匀性、改造干燥鼓风机、优化热工制度,使焙烧温度从1 300℃下降到1 150℃,实现了钒钛磁铁精矿球团的低温焙烧。     

邯邢地区磁精矿造球的实验和机理

 以邯邢磁铁矿精粉为原料,基于现场造球工业实验,考察了不同膨润土配比量、造球水分以及润磨时间等对邯邢磁精矿生球性能的影响规律,得出三者分别为2.0%、8.5%～9.0%和6 min的最佳工艺参数;此外,采用实验室预热氧化和焙烧实验,研究了不同预热氧化温度和时间、焙烧温度和时间对邯邢磁铁矿粉固结性能的影响,并利用光学显微镜分析了预热氧化和焙烧中球团显微结构的变化情况和固结机理。实验结果显示,邯邢磁精矿球团适宜氧化温度和时间分别为880～920 ℃和20 min,适宜焙烧温度和时间分别为1 250 ℃和20 min。     

承德钒钛磁铁精矿球团氧化固结机理与工艺制度的优化研究

本文采用各种主要分析和鉴定手段,研究了承德钒钛磁铁精矿球团氧化固结机理及氧化动力学;用数学方法,分析了影响球团矿质量的主要因素,并对因素取值进行了优化研究。 研究表明:900℃是承德钒钛磁铁精矿球团氧化动力学限制环节的转折点。因此,铁精矿球团氧化温度不宜高于1000℃;矿粉变细,氧化温度亦应降低。该矿球团氧化固结过程分为三个阶段,即氧化阶段,赤铁矿再结晶固结阶段和有液相参加下的赤铁矿“细粒化”及再结晶长大、晶粒连接成片阶段,球团合理的焙烧温度不得低于1250℃。优化计算得出了获得优质球团矿的最佳工艺参数组合.提出了改进承钢球团矿质量的建议。     

预处理褐铁矿零膨润土成球机理

为了拓宽球团原料范围、降低生产成本,采用湿式球磨工艺,将价格相对低廉的褐铁矿粉矿预处理后用于球团生产,结果表明,由于爆裂温度低于300℃、成品球强度低于1 300 N/P,褐铁矿预处理后无法直接用于球团生产;以25%湿式球磨15 min的褐铁矿搭配75%磁铁精矿,在零膨润土的情况下,生球落下强度达到4.1次(0.5 m),爆裂温度420℃,成品球团强度2 445 N/P。对预处理褐铁矿零膨润土成球机理展开的研究表明,预处理后褐铁矿的静态成球指数和比表面积是实现零膨润土造球的关键参数,湿式球磨15 min后褐铁矿比表面积达到1 591.10 cm²/g,静态成球指数达到1.42;由于结合水和原生Fe₂O₃再结晶需要更高的温度,褐铁矿单独成球后的球团抗压强度整体较低;与磁铁精矿搭配后,磁铁矿焙烧时氧化放热有利于Fe₂O₃再结晶,形成了较完整的赤铁矿连晶,大量的渣相形成并填充在缝隙中,球团抗压强度增加;但当褐铁矿配比大于25%时,球团内的孔洞逐渐增多,氧化放热逐渐减少,且球团内的液相...     

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.