配加转炉细灰冷压含碳球团强度性能研究

基于转底炉直接还原工艺,比较了转炉细灰与膨润土、有机粘结剂对含碳球团生球落下强度的影响。发现配加20%转炉细灰与配加6%膨润土造球效果相近,可用其替代膨润土。在含碳球团中配加转炉细灰,通过单因素试验研究了转炉细灰配加量、水分、成型压力、配碳量对生球落下强度的影响,并采用正交试验对影响的程度进行了分析。结果表明:随着成型压力、水分和转炉细灰配加量的增大,生球落下强度先升高后降低;随着配碳量增加,生球落下强度逐渐降低;最佳工艺参数组合为水分15%、压力15MPa、C/O为0.8、转炉细灰配入量为25%。可行性分析认为,在含碳球团中配加转炉细灰是高效利用转炉细灰的可行途径。     

酒钢强磁选红精矿添加生石灰烧结工业性试验

本文总结了酒钢强磁选红精矿添加生石灰烧结工业试验的结果。试验表明,配加3.14％生石灰可使烧结增产16.2％,烧结矿的转鼓强度维持不变,其它冶金性能略有提高。文中还研究了配加生石灰后强化烧结过程的机理,发现混合料制粒后的料球粘附层加厚,球的平均直径变大,料层透气性得到改善,从而获得高的烧结生产率。     

利用印度赤铁矿造球的工艺试验

针对100%印度赤铁矿生产氧化球团的可行性问题,对印度赤铁矿造球工艺参数进行了试验研究。在微型球团矿焙烧模拟系统中,通过模拟链箅机—回转窑生产工艺,采用正交试验的方法,得出:经细磨后的印度赤铁矿小于0.075 mm的矿粉应达到65%以上;配加膨润土的比例为1%左右;按照试验得出的干燥段和预热段工艺参数,实现100%印度赤铁矿造球是完全可行的。     

印度粉矿在包钢烧结工艺的应用研究

文章主要阐述了包钢目前原料条件及铁料配置模式下配加印度粉矿实验室试验研究和生产应用结果。结果表明:在包钢目前自产白云鄂博铁精矿占40%的条件下,配加一定比例的印度粉矿有利于改善烧结料层透气性。配加印度粉后,烧结矿RDI+3.15 mm无变化,但RI和软熔性能有变差的趋势。     

烧结混合料配加杂料的研究与应用

由于钢铁生产过程中产生的钢渣、瓦斯灰、除尘灰等杂料亲水性差,配加到烧结混合料后不利于其成球,导致烧结料层透气性差,影响烧结矿产量和质量。为了降低配加杂料的不利影响,承钢借助烧结杯试验确定了合适的杂料配比并应用于工业生产,同时现场采取了一系列有效措施改善料层透气性,效果很好。     

配加硼镁铁矿生产镁质球团的工业试验研究

镁质球团具有良好的冶金性能,工业试验配加10%硼镁铁精矿生产镁质球团。试验结果表明,生球质量较好,热工参数稳定,镁质球团成品球具有良好的化学成分,其转鼓强度高达96.80%,冶金性能优于酸性球团矿,其中低温还原粉化指数RDI_(+3.15 mm)达99.62%,还原膨胀率下降2.44%。将镁质球团矿用于高炉生产后,高炉炉况稳定。     

强化制粒对含铬型钒钛混合料烧结的影响

 含铬型钒钛混合料制粒效率低,料层透气性差,严重影响了其发展低温高料层烧结。在基准方案基础上,通过烧结杯试验研究了生石灰配比、混合料水分、润湿时间和制粒时间对含铬型钒钛混合料烧结的影响,并对强化制粒效果进行了观察。试验结果表明：在碱度为2.15、配碳量为3.2%(质量分数)、混合料配加生石灰为5%、水分为7.5%、消化时间为10 min,制粒时间为8 min时,平均粒径[d]、拟似粒化指数[GI0]、制粒效率[E]、抗粉化指数[B]分别由2.26 mm、66.30%、54.11%、48.15%提高到2.58 mm、80.43%、90.82%、73.53%,烧结速度、成品率、利用系数、转鼓强度分别由16.54 mm/min、70.39%、1.22 t/(m2·h)、55.36%提高到19.70 mm/min、77.94%、1.64 t/(m2·h)、59.36%。含铬型钒钛混合料对水分敏感度高,应严格控制水分波动。采用强化制粒措施,提高料层透气性,增加氧势,可提高烧结矿中铁酸钙质量分数改善其矿物组成与结构,提高产质量。     

鞍钢鲅鱼圈配加海砂矿生产低含钛球团的研究

为实现鞍钢鲅鱼圈高炉的常态化护炉,对氧化球团配加海砂矿进行实验室试验研究。结果表明:在海砂矿配比为5%、10%、18%时,生球的落下强度和抗压强度下降,爆裂温度下降,但都能够满足生产要求;配加海砂矿后,成品球的抗压强度下降,但都在2 700 N/P以上,成品球的冶金性能改善,TiO_2质量分数在0.41%～1.49%。工业试验结果表明:在海砂矿配比为5%、8%时,球团矿各项指标均能满足生产要求,其变化趋势与实验室研究结果一致;实际中需要调整预热和焙烧制度来生产低含钛球团。通过配加海沙矿来生产低含钛球团在技术上和经济上具备可行性。     

含锌杂料球团金属化烧结实验研究

为了研究钢铁企业含锌杂料的高效利用新技术,以3种含锌粉尘和1种硫酸渣为对象,开展球团金属化烧结新工艺研究。结果表明:在内配无烟煤,生球水分18%,造球时间13 min的条件下造球,在总C/Fe(质量比)为0.5、外配还原剂烟煤(内外还原剂C含量分加比例为50∶50)、料层高度400 mm和风速0.4 m/s的条件下鼓风烧结,得到成品率为85.62%、利用系数为0.471 t/(m~2·h)、转鼓强度为81.31%及固体燃耗为309.67 kg/t的良好指标。金属化烧结矿全铁质量分数为60.53%,金属化率为45.23%,Zn的质量分数为0.18%,锌脱除率为92.78%,烟气冷凝后得到的粉尘经过进一步提纯后可作为锌冶炼的原料。     

基于冷固球团强度和粉末化率的试验研究

基于某钢铁公司年产15万t的冷固球团生产线中消化仓堆料严重、冷固球团粉末化率高和抗压强度低等问题,分别从方锥形消化仓的改造、消化过程的配水量和消化时间对冷固球团粉末化率的影响,以及黏结剂用量对冷固球团强度的影响等方面开展工艺试验。通过方锥形消化仓的改造,其存放的半熟料由60 t提高到100 t左右;消化过程中配水量为6%左右时,冷固球团粉末化率最低达到了31.12%;在黏结剂上采用5%硅酸钠代替改质性淀粉胶,湿球强度提高了3.59%,干球强度提高了6.83%;碳化时间在0~4 h时,冷固球团强度随着碳化时间增加而显著增加,最高可超过1 200 N。     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

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.