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利用气化反应速度不同的焦炭和石墨作为还原剂,考察了铁矿石含碳球团在高温加热时还原铁的渗碳、熔融及球团结构的变化规律。根据研究的结果,得到以下结论:①碳的气化反应速度对铁的渗碳及熔融有重要影响;②气化反应速度较快的焦炭混合球团在1 350 ℃加热9 min时球心部首先出现熔融铁粒,而气化反应速度较慢的石墨混合球团在1 250 ℃加热9 min时在球团表面首先出现熔融铁粒;③反应中物料混合状态的变化以及反应后球团内部空洞的大小都受到碳的气化反应速度的影响。 相似文献
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本文介绍直接还原铁基本特性和在国际上发展的概况及我国直接还原铁的工程建设、生产应用、技术开发和有关制订产品技术条件等情况。 相似文献
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高炉喷吹废塑料做为处理废弃塑料是一种新型的处理方法,其热利用效率高达80%,其中有50%作为还原剂被利用。而在焚烧炉中作为传热和发电时的利用率也只有30%-40%。因此,高炉喷吹废塑料既可以代替部分煤粉,又可以作为解决“白色污染”的投资少、效果好的新方法。 相似文献
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高炉喷吹废塑料做为处理废弃塑料是一种新型的处理方法,其热利用效率高达80%,其中有50%作为还原剂被利用.而在焚烧炉中作为传热和发电时的利用率也只有30%~40%.因此,高炉喷吹废塑料既可以代替部分煤粉,又可以作为解决"白色污染"的投资少、效果好的新方法. 相似文献
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连铸新技术主要体现在:连铸机的高生产率(作业率、拉速、设备可靠)和连铸坯的质量(铸坯洁净度、铸坯表面缺陷、铸坯内部缺陷)。 相似文献
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Effect of Carbon Properties on Melting Behavior of Mold Fluxes for Continuous Casting of Steels 总被引:1,自引:0,他引:1
Mold fluxes are synthetic slags used to coverthe liquid steel meniscus during continuous castingof steel.The flux,whichis continuously fed on thesurface of liquid pool during casting,melts first andthenflowsintothe gap between mold wall and solid-ified steel shell.It is well known that the perform-ance of the flux can greatly affect both the castingoperation and product quality.Because of its i mpor-tance,intensiveinvestigations have been performed,and considerable progress has been made[1-6].… 相似文献
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Joseph A. Halt Samuel C. Roache 《Mineral Processing and Extractive Metallurgy Review》2013,34(3):192-197
Iron ore concentrate pellets are traditionally hardened at high temperatures in horizontal grates and grate-kiln furnaces. However, heat induration requires tremendous quantities of energy to produce high-quality pellets, and is consequently expensive. Cold bonding is a low-temperature alternative to heat induration. Pellets can be cold bonded using lime, cement, sponge iron powder, and organic materials such as starch and flour. Cold bonding consumes less energy than heat induration, and has found favor for bonding self-reducing pellets and for refractory ores that are difficult to heat-treat. Herein, we review the principal cold bonding methods and their fundamentals. 相似文献
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王欢唐萍文光华林小琴任广平赵凡领彭可雕 《钢铁研究学报》2010,22(8):17-17
连铸过程通常采用调节配炭量和配炭方式来调节保护渣的熔化速度和熔融层状结构。本文通过单向加热炉模拟保护渣在结晶器内的熔化过程,研究了六种炭质材料对保护渣熔化速度和熔融结构的影响。结果表明:含量相同时对保护渣熔化速度的控制作用最强的是500目超细石墨,而后依次是:半补强炭黑、390石墨、中超炭黑、土状石墨、增碳剂;配炭方式相同时,保护渣的熔化温度越高,其熔化速度越慢;采用炭黑加石墨的配炭方式时保护渣的烧结层厚度随炭含量增加而减薄,且若炭黑量小于2%时形成多层熔融结构,否则将形成不含半熔层的三层结构。 相似文献
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The experiments related to stress states of ferrite and cementite in carbon steels were carried out including in situ four point bending and tensile test by X ray diffraction technique. Stresses in the cementite phase can be measured by conventional X ray diffraction instrument after a specific treatment on the specimen surface. In order to estimate the stress states in two phases, the X ray elastic constants of two phases in single phase state (PXEC) are determined by the experimental X ray elastic constants of them in composite state (CXEC). The effects of volume fraction and particle size of spheroidal cementite on the interphase stress state are estimated. The experimental results are in good agreement with the theoretical relationships reported in the previous studies. 相似文献
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钒钛铁矿冶炼试验研究 总被引:1,自引:0,他引:1
介绍了钒钛铁矿冶炼的试验研究经过.钒钛铁矿冶炼的理论和试验研究结果表明,采用碱性渣冶炼、降低铁水Si含量、抑制TiO2的还原等措施,高炉可顺利实现钒钛铁矿的冶炼. 相似文献
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ZHANGYou-ping XUEZheng-liang LIZheng-bang ZHANGJia-wen YANGHai-sen ZHOUYu-sheng 《钢铁研究学报(英文版)》2005,12(1):1-4
Carbonferrochromeusedforstainlesssteelpro ductionismainlyproducedinelectricheatingfurnacewiththelumporeasrawmaterial.Finechromitemustbepretreatedbeforeapplication ,butchromiteresourceregardedasfineoreaccountsfor 75 %to 80 %ofthetotalintheworld[1] .Nowaday… 相似文献
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通过加强铁前系统和炼铁系统的设备改造及技术进步,天津铁厂炼铁分厂已初步具备了年产生铁200万t的生产能力。建立中和料场、大力提高喷粉比、抓好高炉长寿是今后十年天铁炼铁技术进步的主要措施。 相似文献