精炼钢包用高档铝镁质浇注料的研制和应用

以特优矾土、电熔白刚玉、亚白刚玉、高铝尖晶石、电熔镁砂、α-Al2O3微分、纯铝酸钙水泥等为主要原料，对浇注料的基质部分进行优化，使研制的高档浇注料具有优良的抗渣性能和抗剥落性能，该浇注料在马钢第三炼钢厂70t钢包上使用，取得了良好的使用效果。     

MgO加入量对Al_2O_3-MgO浇注料抗渣性的影响

以电熔白刚玉为主要原料,同时加入电熔镁砂细粉、铝酸钙水泥、α-Al2O3微粉、Si O2微粉等,保持镁砂细粉与白刚玉粉总加入量一定,通过改变镁砂细粉的加入量,研究了镁砂细粉加入量对Al2O3-MgO浇注料抗渣性的影响。研究结果表明:在Al2O3-MgO浇注料中加入一定量的镁砂细粉,高温下可以形成镁铝尖晶石,从而提高浇注料的抗渣侵蚀性。当镁砂细粉加入量在2%～6%时,浇注料的抗渣侵蚀性能最好。     

精炼钢包用刚玉质无碳预制块砖的研制与应用

以电熔白刚玉、板状刚玉、电熔镁砂、氧化铝微粉、富铝尖晶石微粉等为主原料，研制开发了自结合铝镁（铬）浇注料预制块砖。该预制块砖比传统的钢包浇注料具有更好的抗渣侵蚀和抗剥落性能。在RH精炼钢包上使用渣线平均蚀损0.4毫米／炉、包衬平均蚀损0．31毫米／炉、包底平均蚀损1．68毫米／炉；在LF精炼钢包上使用包壁平均蚀损0．6毫米／炉。     

不同刚玉骨料对刚玉尖晶石砖抗渣性能的影响

以白刚玉、板状刚玉、棕刚玉、镁铝尖晶石、氧化铝微粉为原料,分析了不同骨料加入对刚玉尖晶石砖抗LF炉渣侵蚀性能的影响。通过对比试样的抗LF炉渣侵蚀性能,结果表明,使用粒度3～1 mm的白刚玉和6～3 mm的板状刚玉作为骨料加入时,刚玉尖晶石砖的抗LF炉渣性能最优,且尖晶石与LF炉渣接触面易于形成固溶的保护层,从而减缓渣液向刚玉尖晶石砖本体内的渗透与侵蚀。     

骨料对钢包砖性能的影响

分别以特级矾土熟料、电熔棕刚玉、亚白刚玉为骨料制作钢包试样,对各试样进行常温物理性能、抗渣性及热震稳定性的试验对比。结果表明：由亚白刚玉作为骨料制作的试样物理性能、抗渣性及热震稳定性能最好。     

ZrO2加入量对刚玉-尖晶石浇注料性能的影响

以板状刚玉(6～3 mm、3～1 mm和≤1 mm)为骨料,以电熔尖晶石细粉(≤0.044 mm)、白刚玉细粉(≤0.088mm和≤0.044 mm)、α-Al2O3微粉(≤5μm,d50=2.01μm)为基质,以纯铝酸钙水泥为结合剂,按骨料与基质的质量比为70∶30配料,以ZrO2等量代替白刚玉细粉(≤0.044 mm)制备刚玉-尖晶石浇注料,并研究ZrO2质量分数分别为0、2％、4％、6％、8％时对刚玉-尖晶石浇注料性能的影响.结果表明:随着ZrO2引入量的增大,试样的体积密度和显气孔率均呈上升趋势,线变化率逐渐增大,强度降低,高温抗折强度呈降低趋势,抗热震性和抗渣侵蚀性逐渐增强.综合考虑,ZrO2的最佳引入量为4％～6％.     

机压刚玉-尖晶石无碳免烧钢包砖的研制与应用

为适应生产低碳钢、超低碳钢的要求,以铝矾土、刚玉、电熔镁砂、铝镁尖晶石粉等为主要原料,采用摩擦压力机半干法成型,制备机压刚玉-尖晶石无碳钢包免烧砖,并研究了电熔镁砂、尖晶石和镁凝胶对制品理化性能的影响,对比了机压刚玉-尖晶石钢包衬砖与浇注预制块及整体浇注料的性能差异。实验结果表明,研制的无碳钢包砖具有更好的物理和高温性能,其耐侵蚀、抗剥落、使用寿命长的特点符合高效、低耗、减排的绿色发展理念,是无碳钢包砖的发展方向。     

以高钛型高炉渣提钛后尾渣为结合剂的刚玉浇注料性能研究

利用等离子熔融技术提取硅钛合金后的缓冷尾渣为结合剂,以电熔棕刚玉颗粒、电熔白刚玉细粉(≤0.088mm)、α-Al_2O_3微粉、SiO_2微粉为主要原料,研究缓冷尾渣加入量(0、2%、4%、6%、8%)对刚玉基浇注料性能的影响。试验表明:1随着缓冷尾渣加入量的增加,浇注料的需水量增大,常温和高温烧后强度逐步增强,中温强度则逐步降低;2加入量过多不利于其热震性能和高温抗折强度的发展;3在抗渣侵蚀性能方面,加入6%缓冷尾渣试样的侵蚀指数最大,加入量4%缓冷尾渣与以4%Secar71水泥结合的浇注料,抗侵蚀性能接近;4在刚玉浇注料中缓冷尾渣的加入量4%左右为宜,不宜超过6%。     

电熔铝镁铬在透气座砖浇注料中的应用研究

为提高透气座砖浇注料的使用性能,分别用5~3、3~1、1~0和≤0.074mm的电熔铝镁铬代替浇注料中相应粒度的板状刚玉颗粒,研究其对浇注料的常温强度、致密度、热震稳定性和抗渣性的影响。结果表明:(1)电熔铝镁铬与板状刚玉骨料1∶1比例复合时,试样的气孔率最低,体积密度最高,常温强度最大;(2)板状刚玉完全被电熔铝镁铬替代时,试样的抗渣性最好。综合考虑,当电熔铝镁铬与板状刚玉骨料1∶1比例复合时,试样的综合性能最好。     

RH炉用刚玉-尖晶石浇注料的研究

主要研究了ZrO2细粉、MgO细粉加入量对刚玉一尖晶石浇注料性能的影响；用静态坩埚法研究了加入不同添加剂的刚玉一尖晶石浇注料抗渣侵蚀行为。结果表明：加入适量氧化锆细粉有补强作用，提高强度；加入适量MgO细粉可在高温下生成尖晶石，强化基质，提高强度。在浇注料中加入一定量的MgO细粉能增强浇注料的抗渣性；加入ZrO2细粉会使浇注料的抗渗透性和抗侵蚀性下降。     

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.