冶金尘泥混合造球研究及参数优化

通过正交试验对转炉污泥、高炉瓦斯灰和高炉瓦斯泥混合造球进行了研究,考察了C/O、粒度和膨润土添加量对生球强度和烘干粉化率的影响,并对正交试验各指标进行了优化计算。结果表明,在C/O为0.9~1.3,-200目粒度比例为40%~80%,膨润土用量1%~5%的试验条件下均可造出合格球团。影响湿球强度及烘干粉化率的因素由强到弱为:膨润土添加量粒度C/O;在C/O=0.9、-200目粒度比例为80%、膨润土添加量5%的最优水平下,抗压强度可达33.39 N/个,粉化率为0.83%。影响干球落下强度和抗压强度的因素由强到弱为:C/O膨润土添加量粒度;在C/O=0.9、-200目粒度比例为40%、膨润土添加量为5%的最优水平下,落下强度为9.33次/个,抗压强度为107.47 N/个。通过优化,得到最佳经济造球条件为:C/O=1.1、-200目粒度比例为60%、膨润土添加量3%     

粘结剂对尘泥含碳球团干球强度的影响

在检测分析各种原料物化特性的基础之上,研究了配加不同种类、配比的粘结剂对尘泥含碳球团生球以及干球强度的影响。结果表明,当消石灰配入量为2.0%时,生球的抗压强度和落下强度分别能达到16.40 N/个和6.2次/0.5 m,干球的抗压强度和落下强度分别能达到59.34 N/个和2.1次/0.5 m。参照某转底炉现场生产使用的原料配比,用成球性较好的转炉泥替代成球性较差的机头灰,同时用2.0%消石灰代替2.0%膨润土作粘结剂时,生球、干球的抗压强度和落下强度均得到提高。     

冶金含铁尘泥复合球团直接还原试验研究

以酒钢高炉瓦斯灰、转炉OG泥、转炉二次除尘灰和自产铁精矿为主要含铁原料制备复合球团开展直接还原试验。通过利用马弗炉模拟平铺料式隧道窑焙烧过程开展基础性试验研究,考察焙烧温度、焙烧时间、球团配比等条件对金属化球团金属化率、抗压强度的影响,结果表明:金属化球团金属化率和抗压强度指标均随焙烧温度的提高和焙烧时间的延长而升高,综合考虑金属化率和抗压强度指标,球团在焙烧温度1 200℃、焙烧时间100 min时是比较适宜的;不同瓦斯灰配入量条件下试验结果表明,球团金属化率随瓦斯灰配入量的增加而升高,抗压强度随瓦斯灰配入量的增加而降低。在此基础上,利用30 m平铺料式隧道窑装置开展了直接还原半工业验证试验,最终取得金属化球团铁品位73.51%、金属化率88.76%、抗压强度平均2 328 N、脱锌率95.10%的试验指标,金属化球团抗压强度等各项指标均满足酒钢高炉或转炉用料要求,说明通过平铺料式隧道窑处理冶金含铁尘泥复合球团在技术上是可行的。     

冶金尘泥制备金属化球团成型试验研究

用高炉瓦斯灰和转炉污泥进行制备金属化球团的成型试验,研究了粘结剂种类及其添加量、配水量、成型压力等对尘泥成型效果的影响.结果表明,粘结剂种类对成型效果的影响很明显,甲基纤维素的成型效果明显优于膨润土.在甲基纤维素用量0.3％、成型压力75kN、配水量10％的优化参数下,采用压团法所制备的金属化球团干球落下强度能满足转底炉生产要求.     

程潮磁铁精矿配加除尘灰的成球性能研究

研究了程潮铁矿球团除尘灰的理化性质,以及除尘灰配比对生球质量与成品球抗压强度的影响。结果表明:随着除尘灰配用量增加,生球落下强度、抗压强度和爆裂温度以及成品球抗压强度都呈降低的趋势。从造球性能以及生球、成品球质量考虑,除尘灰的最大添加量不宜超过4%,此时,生球落下强度和抗压强度分别可达到4.6次/0.5 m和12.1 N/个,爆裂温度为580℃,成品球抗压强度可达到1842 N/个,基本满足球团生产要求。     

转炉炼钢污泥冷固结成型实验研究

使用对辊压球机压团,对转炉污泥的冷固结成球性能进行了实验研究。结果显示,加糖浆和F粘结剂制成的球团抗压强度随粘结剂用量增加先增加后减小;用水玻璃作粘结剂时,球团抗压强度随粘结剂用量增加而增加。在一定水分含量下,球团抗压强度与膨润土添加量成正比。加糖浆、F粘结剂、水玻璃和膨润土四种粘结剂所制得的球团,其最大抗压强度分别为:1 214 N/个、1 094 N/个、1 268 N/个和976 N/个。四种球团的抗压强度都随成球压力的增加而增加,但变化趋势不尽相同。     

高镁铁精矿制备球团试验研究

目前,镁质球团制备主要是添加镁质熔剂,对高镁精矿直接制备镁质球团研究较少。以国外某高镁铁精粉为原料,系统研究了造球参数、预热参数及焙烧参数对球团性能的影响,并进行了投笼工业试验。结果表明,在膨润土用量1.2%,生球水分8.0%,造球时间15min的条件下,生球落下强度4.2次/(0.5m),抗压强度18 N/P,爆裂温度425℃;在预热温度1050℃,预热时间15min,焙烧温度1250℃,焙烧时间15 min的条件下,预热球团抗压强度524N/P,焙烧球团抗压强度2589N/P;成品球团的全铁品位63.35%,MgO含量1.70%,有害元素含量低,冶金性能优良,是一种优质的高炉炉料。     

降低转炉炼钢污泥熔点的试验研究

以炼钢污泥作为主要原料,辅以其它配料,旨在造出高强度的污泥球(抗压强度不小于1 500N),作为高炉用原料.对降低转炉炼钢污泥的熔点作了系统的研究表明,当B配比在10%～12%、C配比在5%～10%、干污泥配比在78%～85%时,污泥达到软化时的温度在1 240℃左右;污泥的软化温度在降低到1 238～1 250℃时,其内部粘结相主要是铁酸钙和硅酸钙,并且铁酸钙与磁铁矿形成熔融交织结构;当物料配比碱度在4.5～5.0之间时,污泥的软化温度相对较低.     

钢铁厂含铁尘泥造球实验研究

通过不同条件下的尘泥造球实验,得到了优化的高炉尘泥、转炉尘泥造球工艺技术参数,当调整好干尘与湿泥、含碳尘泥的比例和控制好混合料及成球水分时,可以在不配加任何铁精矿和膨润土用量较低的条件下,完全用高炉尘泥、转炉尘泥在盘式造球机上造出含碳15%-20%的尘泥球团,其生球强度和含碳量完全可以满足转底炉（RHF）或回转窑直接还原工艺的需要。     

新型有机粘结剂GPS用于铁矿球团的研究

本研究采用新型有机粘结剂GPS替代或部分替代膨润土制备铁矿球团.研究结果表明:配加0.2%的单一粘结剂GPS,即可获得性能满足要求的生球.当配加0.1%GPS 0.5%膨润土时,生球的落下强度为3.2次、抗压强度11.0 N/个、爆裂温度＞600 ℃,成品球的抗压强度在2 450 N/个左右,与配加2.0%膨润土的相比较,在满足生球强度、爆裂温度和焙烧球强度的基础上,使球团矿铁品位提高了1个百分点以上.     

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.