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以CaO-SiO2-FetO-P2O5四元渣系为研究对象,结合理论计算和热态实验综合分析 P2O5含量变化对该四元渣系物相组成以及富磷相的影响。应用Factsage软件equilib模块计算CaO-SiO2-FetO-P2O5四元渣系在400~1800℃温度区间的多相平衡,再结合SEM+EDS与XRD对热态实验结果进行分析知,随着渣中P2O5含量的增加,富磷相中Ca3(PO4)2的含量随之增加。此外,P是以nC2S-C3P固溶体的形式存在于富磷相中,但当渣中P2O5含量达到18%时,富磷相中的P将以Ca3(PO4)2的形式独立存在。热态实验的分析结果进一步验证了Factsage的理论计算结果。 相似文献
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介绍了石灰石-石膏法空塔喷淋脱硫工艺在湘钢360m2烧结机烟气脱硫工程中的应用,阐述了该脱硫工艺主要技术参数和关键技术要点,总结了系统运行常见问题与处理方法。该系统运行以来脱硫效率保持在90%以上。 相似文献
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为了掌握高温区碱金属对焦炭气化过程的影响,在N2-CO-CO2-H2O和N2-CO-CO2-H2O-K(g)气氛下,利用热失重法分别研究了焦炭在1 413~1 773 K的气化反应特征。结果显示,K(g)对焦炭的气化反应具有较强的正催化作用,可以显著提高有效内扩散系数(De)和界面反应速率常数(k+),降低内扩散活化能与界面反应活化能,且K(g)对内扩散的影响程度高于对界面反应的影响。随着反应率的增加,内扩散阻力(ηi)和界面反应阻力(ηC)均逐渐增加,K(g)可以促进ηi和ηC降低。在N2-CO-CO2-H2O气氛、1 413 K时,气化反应的限制性环节逐渐由界面反应转为内扩散;而在1 473、1 573、1 673和1 773 K时其限制性环节始终为界面反应。在N2-CO-CO2-H2O-K(g)气氛下,气化反应的限制性环节始终为界面反应。 相似文献
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为促进含锰磁铁矿在球团上的应用,通过造球试验,并借助X射线衍射和扫描电子显微镜等检测手段,系统地分析了Mn3O4对球团矿氧化固结机理的影响。结果表明,随着Mn3O4质量分数从0%增加至7%,球团抗压强度从2 458 N/个降到1 810 N/个,孔隙率从22.7%增大至26.2%。随着Mn3O4的增加,在赤铁矿晶界和硅酸盐相中形成新的MnFe2O4固熔体,固熔体扩大了基体中的裂纹,破坏了赤铁矿的连续结晶;硅酸盐含量增加也极大地抑制了赤铁矿晶粒的生长,使含锰球团的基体由致密变为多孔,球团矿强度降低。故对生产企业来说,Mn3O4对球团的固结强化有负面影响,其适宜的质量分数应在3%以内。 相似文献
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目前中国粗钢产量已经占世界总产量的一半以上,中国钢铁工业的发展对世界意义重大。中国钢铁工业主要采用以煤炭为主要燃料的“高炉-转炉”长流程冶炼工艺,因此在钢铁生产过程中排放出大量的空气污染物,主要包括二氧化硫(SO2)、氮氧化物(NOx)和颗粒物(PM2.5)等。从钢铁工业污染物的来源、污染物的排放总量变化情况、不同冶炼工序污染物排放特点、中国钢铁工业污染物排放量地域分布特点以及不同规模的钢铁企业污染物排放特点等多角度综述了近年来中国钢铁工业的空气污染物排放现状。同时简要综述了中国钢铁工业为治理空气污染物而进行的超低排放改造进展情况,据此提出了中国钢铁工业空气污染物治理存在的问题,并分析了未来中国钢铁工业空气污染物排放及减排趋势。 相似文献
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为获得Ni60Ti40形状记忆合金热变形的最佳工艺参数,利用等温恒速率热压缩试验研究了在温度为800~1 000 ℃、应变速率为0.005~5.000 s-1条件下Ni60Ti40合金的热变形行为,通过探究不同变形温度和应变速率对Ni60Ti40合金流变行为的影响创建本构关系,并以动态材料模型为基础构建热加工图。结果表明,Ni60Ti40合金的流变应力随变形温度的升高而减小、随应变速率的升高而增大。温度为900~1 000 ℃、应变速率为0.005~0.500 s-1时,流变应力较快达到稳态,且所需的变形量较少。采用Arrhenius双曲正弦模型构建的Ni60Ti40合金热变形的流变应力本构关系模型可基本准确地预测实际流变应力随工艺参数的变化趋势,计算得到Ni60Ti40合金的平均热变形激活能为213 kJ/mol。Ni60Ti40合金的热变形有3个稳定变形区和1个失稳区,适宜变形的区域为800~870 ℃/0.005~0.080 s-1、870~950 ℃/0.080~0.500 s-1和950~1 000 ℃/0.050~5.000 s-1;不适合进行热加工的区域为800~850 ℃/0.220~5.000 s-1。 相似文献
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Global warming caused by greenhouse gases(GHGs) has been recognized as a worldwide problem.Of all the GHGs ,CO2is the most significant ,account-ing for half the greenhouse effect .In 1992 , over 150countries signedthe United Nations Framework Conven-tion on Cli mate Change (UNFCCC) onthe Cli mate Con-ferencein Rio.Six years later ,the 3rd meeting washeldin Kyoto ,and 175 countries agreed to take fur-ther actions to reduce GHGs emissions .In February2005 ,the Kyoto Protocol ,in whic… 相似文献
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The sustainable development against global warming is a challenge faced by societies at global level. For steel industry, the pressure of reducing CO2 emission is likely to last many years. During the past decades, the CO2 emission per ton steel has been reduced mainly due to the improvement of energy efficiency. Entering the 21st century, the steel manufacturing route must have three functions, namely, production of high performance steel products, conversion of energy, and treatment of waste. In the near future, it is expected that existing BF-BOF and EAF routes will be improved, in order to produce high performance steels, increase the use of scrap, and integrate steel industry with other industries for mitigating CO2 emission. In the long term, using carbon-free energy, reducing agents, and storing CO2 securely or converting CO2 into a harmless substance can be presumed for tremendous reduction in CO2 emission. 相似文献
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中国钢铁工业CO2减排的进步与展望 总被引:2,自引:0,他引:2
CO2减排已引起中国钢铁行业的高度重视。中国钢铁行业20多年来,一直重视节能工作,并取得了巨大成就,成为CO2减排最重要的基础。1990年以来,不同时间段的吨钢综合能耗年均降低值为3.02~5.85个百分点,主要大型钢铁企业能耗水平已与国外先进企业相当,干法除尘、冶金煤气、余压、余热利用技术水平不断提高,钢铁能耗统计不断完善,先进的“少碳”、“非涉碳”冶金技术正在研发。在保证中国发展的前提下,不断淘汰落后企业和装备,深化节能技术,进一步降低CO2是中国钢铁工业最为迫切和长远的任务。 相似文献
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CO2减排是我国实现清洁化生产中长期规划中的一项重要内容。通过论述矿渣微粉是实现CO2减排的主要途径,指出八钢建设矿渣微粉项目,不仅能够有效地降低八钢工业固体废弃物的排放和环境污染问题,而且对新疆工业CO2减排具有重要意义。 相似文献
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Chunbao 《钢铁研究学报(英文版)》2010,17(3):1-7
The global steel production has been growing for the last 50 years, from 200 million metric tons in 1950s to 1,240 million metric tons in 2006. Iron and steelmaking industry is one of the most energy-intensive industries, with an annual energy consumption of about 24 EJ, 5% of the world's total energy consumption. The steel industry accounts for 3-4% of total world greenhouse gas emissions. While enhancing energy efficiency could be a short-term approach for the steel industry to reduce greenhouse gas emission, the long-term approaches to achieve a significant reduction in CO2 emissions from the steel industry would be through (1) developing and applying CO2 breakthrough technologies for iron and steelmaking, and (2) increasing use of renewable energy (in particular, bio-energy) for iron and steelmaking. This paper presents an overview of new CO2 breakthrough technologies for iron and steelmaking, and the current research and development for the use of biomass and bio-fuels as substitutes for coke, coal and natural gas in various iron and steelmaking processes including iron-ore sintering, blast furnace operations, and new iron and steelmaking processes. The key challenges for utilization of bio-energy on a large scale for iron and steelmaking are also discussed in this paper. 相似文献
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《炼钢工业污染物排放标准》(GB 28664—2012)规定了油雾排放浓度限值,但相应监测方法标准尚未公布,我们采用红外分光光度法测定轧钢工业油雾排放浓度,用等速采样法采样,用四氯化碳溶解、超声清洗金属滤筒的方法,测定轧钢工业油雾的排放浓度,并通过加标回收实验验证该方法的准确性。 相似文献
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As the largest energy consuming manufacturing sector and one of the most important sources of carbon dioxide (CO2) emissions, the China's iron and steel industry has paid attention to the study of changing trend and influencing factors of CO2 emissions from energy use. The logarithmic mean Divisia index (LMDI) technique is used to decompose total change in CO2 emissions into four factors: emission factor effect, energy structure effect, energy consumption effect, and steel production effect. The results show that the steel production effect is the major factor which is responsible for the rise in CO2 emissions; whereas the energy consumption effect contributes most to the reduction in CO2 emissions. And the emission factor effect makes a weak negative contribution to the increase of CO2 emissions. To find out the detailed relationship between change in energy consumption or steel production and change in CO2 emissions, the correlation equations are also proposed. 相似文献