共查询到20条相似文献,搜索用时 78 毫秒
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针对八钢铁水供应不足且铁水成分波动较大的问题,文中在现场冶炼数据采集的基础上,依据转炉冶炼的物料平衡、热平衡以及现场试验,研究了铁水成分、铁水重量、铁水温度、出钢温度以及留渣操作等工艺参数对废钢加入量的影响.通过采用留渣操作、适当提高铁水温度、减少辅料消耗以及适当降低转炉出钢温度等措施,转炉废钢比由16.4%提高到21.3%,脱磷率由79.3%提高到93.3%,同时石灰和白云石消耗量分别降低了3.3 kg/t钢和6.7 kg/t钢. 相似文献
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《炼钢》2017,(1)
通过转炉热平衡计算,建立了转炉富余热量与铁水成分和温度、废钢加入量和转炉出钢温度等工艺参数之间关系式;定义了转炉用石灰石代替活性石灰炼钢的CaO理论替代比η,并建立了石灰石CaO理论替代比与转炉富余热量之间的函数关系。研究表明:1)提高入炉铁水温度和铁水含碳量可显著提高转炉石灰石CaO理论替代比;2)铁水中的硅含量对石灰石CaO理论替代比的影响与铁水入炉温度有关,当入炉铁水温度低于1 300℃时,提高铁水硅含量能使石灰石CaO理论替代比增加;当入炉铁水温度高于1 300℃时,石灰石CaO理论替代比随铁水硅含量的增加反而下降;3)在转炉终渣碱度和出钢温度一定时,减少废钢加入量可以大幅度提高转炉用石灰石代替活性石灰炼钢的CaO理论替代比。 相似文献
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为了提高转炉废钢比,降低铁水消耗,以转炉炼钢物料平衡和热平衡为理论依据,通过减少入炉铁水、增加冷料,计算出以焦炭为辅助热源的钢铁料新配比.通过试验证明,在该配比下转炉冶炼顺行,成功降低了铁水消耗. 相似文献
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以高炉铁水为主原料,利用合金熔化炉熔化高碳铬铁、镍铁等合金,采用转炉进行脱磷,再将混合后的不锈钢母液兑入AOD炉进行精炼脱碳来生产430、410及其他马氏体等常规400系不锈钢,这是近年来国内流行的两步法不锈钢生产工艺流程。基于宝钢德盛不锈钢有限公司两步法不锈钢工艺流程,建立转炉与AOD炉的物料平衡和热平衡计算模型,对转炉+AOD的两步法物料平衡和热平衡工艺、物料匹配工艺等方面进行系统优化研究,探索不同炉料组合生产常规400系不锈钢的工艺路径。研究结果表明,中频炉(合金熔化炉)的使用对AOD冶炼的热平衡有很大影响,当不使用中频炉时需要使用焦炭补充热量缺口,并以品种不锈钢废钢作为冷却剂来保证出钢温度满足生产要求;铬铁水在AOD入炉不锈钢母液中最优的配比为30.0%~32.5%,这时基本不需要额外加入焦炭和不锈钢废钢。模型计算结果可为转炉+AOD两步法生产不锈钢提供生产指导。 相似文献
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循环经济是对物质闭环流动型经济的简称,它是坚持可持续发展的科学发展观,按照清洁生产方式,对能源及其废弃物实行综合利用的生产活动过程,其本质是一种生态经济、高效经济、资源闭环利用型经济,是新型工业化的重要载体,是环境保护、资源节约型经济的发展模式. 相似文献
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The tensile and creep properties of oxygen free OF- and oxygen saturated OS-polycrystalline copper have been investigated
in the temperature range 25 to 500 °C. Oxygen increases the yield strength by a factor of 2 or 3, by solid solution hardening,
and for coarse-grained copper, causes a severe embrittlement, particularly under creep conditions. Both direct and indirect
evidence indicate that the embrittlement is caused by the segregation of oxygen to the grain boundaries in copper, thus promoting
grain boundary decohesion and intergranular fracture. Auger electron spectroscopy is used to indicate the presence of oxygen
at the grain boundaries in OS-Cu. The embrittling effects of oxygen are reversible in the sense that both tensile and creep
ductility are restored when oxygen is removed. 相似文献
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较详细地介绍地下开采过程中中深孔落矿工艺的应用和实践中应注意的问题,通过对中深孔设计参数的改进出口,爆破技术的提高,严把施工质量关,给西安里铁矿创造了良好的经济效益。 相似文献
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G Brennan 《Canadian Metallurgical Quarterly》1998,1(6):196-198
Relatives have an increasingly important role in providing care in the community to people with mental health problems, yet numerous studies have highlighted a lack of support from health care professionals. GEOFF BRENNAN describes the findings of a study to investigate the information provided to relatives of patients in one trust, and suggests solutions to the ethical and professional dilemmas raised. 相似文献
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Relatives have an increasingly important role in providing care in the community to people with mental health problems, yet numerous studies have highlighted a lack of support from health care professionals. GERARD LEAVEY and colleagues describe a study to investigate the information provided to relatives of patients in one trust, and suggest solutions to the ethical and professional dilemmas raised. 相似文献
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Venanzio R. Greco 《Canadian Metallurgical Quarterly》2006,132(2):269-271
The thrust on retaining walls, when a set of lines of surcharge act on the backfill, is often calculated using analytical solutions partially based on the elasticity theory. Coulomb’s method, which is able to give a numerical solution, is, in contrast, seldom used. This technical note presents the analytical solution of the active thrust on retaining walls based on the approach of Coulomb. It is also usable in seismic conditions, when analyzed by the pseudostatic method of Mononobe and Okabe. 相似文献