不同SiO2质量分数精粉对烧结指标的影响

为了比较不同精粉配入混合料后对烧结指标及烧结矿质量的影响,进行了精粉高温性能测试及烧结杯试验。结果表明,不同精粉的表观形貌及高温性能有显著差别;在基本不改变熔剂结构的条件下,随精粉SiO2质量分数的升高,液相流动性显著降低,烧结过程中黏结相生成量减少,不利于混合料中各矿物之间黏结成矿。采用不同精粉烧结时,烧结矿微观矿物结构具有显著的差异;精粉中SiO2质量分数升高会导致烧结矿中铁酸钙生成量减少,SiO2酸盐逐渐增多,孔洞增加。与低SiO2精粉烧结相比,采用高SiO2精粉烧结后,固体燃耗增加,转鼓指数下降,粒度组成中小于10 mm的量增加。     

高精粉率原料条件下的烧结生产实践与研究

针对提高烧结混合料精粉率后会造成烧结料层透气性恶化和负压升高,从而影响烧结矿产质量的问题,唐钢对高精粉率原料条件下的烧结生产进行研究。结果表明,当烧结混合料精粉率提高到37%后,通过提高混合料水分、降低料层厚度、提高烧结机机速等操作措施,保证了烧结矿强度不变,满足了高炉生产需求。     

配加高比例超细精矿粉对烧结的影响

为了充分利用自产资源,进行了高比例超细精矿粉对烧结影响的试验。结果表明:随着精矿粉配比的增加,烧结矿的产量、质量指标呈下降趋势,当精粉率超过70%时,烧结负压升高,烧结速度降低,利用系数下降了8.6%,转鼓强度降低3%以上;随着精粉配比的增加,烧结时混合料所需水分增加,且适宜区间变窄,水分的控制难度增大;特别是全精粉烧结时,适宜水分质量分数的波动范围只有±0.25%,当水分控制不稳定时出现熄火、烧结过程停滞的现象。     

高比例铁精粉烧结生产实践

为优化原料资源配置,2016年唐钢公司在烧结生产中大幅度提高铁精粉,特别是自产精粉的使用比例。针对精粉比例由19.82%提高到30.34%的生产经营预期,中继仓位槽位由70%降至20%以下,启用机头松料器、烧结矿中的MgO含量由2.3%降至2.0%。通过优化烧结矿的成分、强化混合料制粒效果、改进布料设备等措施,确保了烧结矿的主要技术指标稳定。     

核矿石对低钛型钒钛磁铁精粉烧结制粒的影响

 为了改善低钛型钒钛磁铁精粉的制粒性能,研究了核矿石对低钛型钒钛磁铁精粉烧结制粒行为的影响。研究结果表明,低钛型钒钛磁铁精粉粒度粗,比表面积小,形貌主要为光滑的不规则形状和片状,颗粒间黏附力弱,不利于烧结混合料制粒;低钛型钒钛磁铁精粉的颗粒长大指数和均匀性指数的指标较好,制粒效率和制粒后准颗粒小球的均匀程度不是低钛型钒钛磁铁精粉制粒的限制性环节,核矿石种类对颗粒长大指数和均匀性指数的影响较小。相对普通矿粉而言,低钛型钒钛磁铁精粉制粒后准颗粒小球的抗热粉化指数较低,破损指数较高;不同核矿石条件下,准颗粒小球的抗粉化指数和破损指数差异均较大;褐铁矿作为核矿石时,制粒后准颗粒小球抵抗外力冲击和热气流冲击的能力最强,赤铁矿次之,烧结返矿最差。综合分析核矿石对低钛型钒钛磁铁精粉烧结混合料制粒的影响,核矿石的优选顺序为褐铁矿、赤铁矿和烧结返矿。     

提高105m~2烧结机料层的生产实践

河北敬业集团105 m2烧结机在国内精粉比例偏高的不利因素下,通过控制混合料水分、提高混料系统造球、合理控制燃料质量等措施,使烧结料层由550 mm提高到680 mm,烧结机的利用系数、固体燃耗、返矿率、烧结矿的转鼓强度均有较大提高。     

360 m~2烧结机配加经济料生产实践

承钢公司炼铁事业部在综合评价印尼海砂、石灰石粉、新西兰海砂等烧结用经济料的基础上,分析了这些经济料对烧结生产的影响。稳定混合料水分,减少料层过湿;稳定烧结料成分,减少小烧结矿碱度的波动;改进操作工艺,稳定烧结矿的强度。在保证烧结矿质量的前提下,360 m~2烧结机成功配加了印度粉、石灰石粉、新西兰海砂等经济料,降低了烧结原料成本,烧结矿的产量能够满足高炉需求。     

高比例精矿粉对烧结的影响分析及强化措施探讨

太钢吕梁铁矿投产,烧结铁料中自产铁矿的配比超过了85%,且自产铁精矿粒度很细,其中吕梁铁精矿不超过0.045mm的比例占到了96%以上。要在730mm左右的料层高度条件下,为4350m3高炉生产优质烧结矿,难度较大。会使混合料制粒效果变差,而且自产精粉比例较大,配矿结构调整余地很小,不利于烧结过程的进行和烧结矿质量的改善。为了给烧结配用自产资源提供技术支持,摸清高比例精矿粉对烧结造成的影响,在技术中心进行了烧结杯试验。试验结果表明：随着精粉率的提高,烧结矿的产、质量指标变差,当精粉率超过70%时,烧结过程变得缓慢,特别是全精粉烧结时,控制不好,会出现烧结熄火,烧结过程停滞的现象。为此,要采取强化制粒、优化燃料粒度、提高碱度等有效措施。     

w(MgO)对本地高硅铁精粉球团强度影响

采用铁矿粉基础特性测定系统和偏光显微镜,对本地高硅铁精粉M、Y以及低硅精粉进行基础特性实验并通过矿相分析研究了w(MgO)对球团强度的影响。铁矿粉基础特性实验结果表明：M粉同化性温度较高且连晶强度较高,适宜用作造球的主要原料;混合料的合理配比为M粉∶Y粉∶低硅精粉=5∶3∶2,在此配比下的w(SiO2）约为55%~56%。然后进行压块焙烧实验,研究结果表明：随着w(MgO)的提高,压块抗压强度呈先升高后降低的趋势,在w(MgO)=18%时达到最高,为3531N/个;当w(MgO)=18%时,矿相主要为赤铁矿相,赤铁矿结晶最好并连接成片,硅酸钙相较少,粘结相和铁酸钙相一定程度上稳定了整体的结构,强度达到最高;而随着w(MgO)继续增多,铁酸镁相增多,抑制了赤铁矿的结晶,连接晶发育差,晶粒细小分散,强度降低。     

首钢烧结机点火器温度微型机控制系统

一、工艺流程简介 烧结矿是高炉炼铁的主要原料。首钢的烧结生产是先将精铁矿粉和煤粉、熔剂等一些辅助原料合成混合料,经搅拌、加水混合、预热等工艺流程,把混合好的混合料均匀铺到烧结机的台车上。烧结机的台车在一个大电机带动下,以一定速度前进。烧结机     

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.