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影响电煅无烟煤电阻率的几个因素 总被引:1,自引:1,他引:0
对电煅无烟煤电阻率与一次送电电流和温度之间的关系进行了试验研究,得到了它们之间的关系表面式模型,据此,可以在环境温度,炉壳温度变化不大的情况下,预测电煅无烟煤的电阻率,另外还分析了电阻率与真密度,原煤粒度分布,加排料量,煅烧区长度,电流密度之间的相关性,结果表明,电煅无烟煤电阻率及其分布与电流密度,煅烧区长度,原煤粒度分布,加排料量密切相关。 相似文献
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无烟煤在用于炭素制品生产之前必须经过煅烧 ,以除去其中的挥发分 ,并使无烟煤的电阻率降低。研究表明 ,在用于高炉和铝电解槽砌筑时 ,就炉衬寿命而言 ,电煅无烟煤炭块优于煤气煅烧的无烟煤炭块 ,这是由于电煅无烟煤与煤气煅烧的无烟煤相比 ,平均煅烧温度高 ,有较低的电阻率和气化反应率 ,较高的真密度、抗碱金属侵蚀性和导热性[1] 。最近几年 ,随着国内炼铝工业的飞速发展 ,阴极炭块需求量猛增 ,一些中小型炭素厂相继建成了电煅烧炉 ,如今 ,电煅烧已成为炭块生产中的关键技术。电煅烧炉要消耗大量宝贵的电能 ,通常生产 1t电煅无烟煤大约要… 相似文献
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以云南小发路无烟煤为原材料生产密闭糊,系统考察了小发路无烟煤在高温电煅烧过程中真密度、电阻率等理化性能与煅烧温度的关系,在此基础上通过均匀设计试验确立了以电煅料为原材料生产密闭糊的优化配方及其工艺条件。结果表明:经2000℃以上高温煅烧处理,小发路无烟煤的粉末电阻率可降低到500μΩ.m以下,真密度可提高到2.09g/cm3以上;以经过约2000℃电煅烧处理的小发路无烟煤为基本原料,通过一定的组成和粒度配方、优化工艺条件可以生产出达到国家标准要求的密闭糊,为小发路无烟煤在炭素行业的应用提供了实验依据。 相似文献
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概述传统无烟煤煅烧炉的结构形式,主要技术参数优缺点,并指出没有利用或大部分没有利用无烟煤挥发份对自身加热。研制成功新型无烟煤煅烧炉,充分利用无烟煤挥发份作为加热的能源。并且化学反应热直接作用无烟煤本体。不需要外加能源,热效率高,温度在1350℃-1450℃,煅烧煤成本低,质量达到电煅煤的标准。 相似文献
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《炭素技术》2009,28(4):52-52
一种电解铝阳极炭块及其制备方法,电解铝阳极炭块由无烟煤、石油焦、黏结剂混合制作而成,其制备方法根据无烟煤灰分含量的不同,用不同比例的无烟煤与相应的石油焦混合,先对无烟煤进行洗选处理,除去煤中的矸石以及部分矿物,使得无烟煤的灰分降低,固定碳的含量增加;用气煅或者电煅,使无烟煤排出挥发分,促使部分灰分分解,降低其粉末电阻率,增大密度和机械强度以及提高原料的抗氧化性;对煅烧或未煅烧的无烟煤进行破碎磨粉,进一步脱灰处理,用振动压实或剪切压实法压制成生炭块;而后进行焙烧即得到产品。用无烟煤代替传统的石油焦制作铝电解阳极炭块,有利于扩大无烟煤的利用途径,降低炭阳极的成本,缓解石油资源匮乏带来的危机。 相似文献
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《Ceramics International》2023,49(18):29542-29552
Based on the domain theory, the domain structure of electrically calcined anthracite was studied for the first time. The carbon microstructure of the electrically calcined anthracite was analyzed using atomic force microscopy (AFM). The analysis revealed that the carbon microstructure comprised microdomains with particle sizes below 30 nm and domains with particle sizes below 200 nm. In addition, non-graphitizable carbon structures formed by partial microdomain and domain structures were difficult to grow. Thus, we successfully synthesized novel β-type silicon carbide (β-SiC) nanoparticles with larger particle sizes below 200 nm and smaller particle sizes below 60 nm using a non-graphitizable carbon composed of carbon nanoparticles as the main raw material. Through calculation and analysis, the synthesis mechanism revealed that due to the presence of highly reactive interfacial regions between the domains of electrically calcined anthracite, silicon first diffused to the highly reactive interface between the domains of electrically calcined anthracite and reacted with the highly active carbon atoms in it to form silicon carbide, resulting in a certain degree of volume expansion. The volume expansion led to the cracking and dispersion of the domains, which further led to mutual diffusion and reaction within the exfoliated domains to generate SiC nanoparticles. And the non-exfoliated SiC nanoparticles generated at the reaction interface on the surface of electrically calcined anthracite were observed by the AFM. 相似文献
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Cortonwood Silkstone (NCB class 401) and Betteshanger (NCB class 301 a/204) coals were co-carbonized with solid additives such as anthracite, coke breeze, green and calcined petroleum cokes. The resultant carbonization products (cokes) were examined by optical microscopy and SEM was used to investigate polished surfaces etched by chromic acid and fracture surfaces. For both coals only the anthracite and green petroleum coke become bonded to the coal cokes. This probably results from softening and interaction of interfaces of the anthracite and green coke with the fluid coal via a mechanism of hydrogenating solvolysis during the carbonization process. The coke breeze and calcined petroleum cokes were interlocked into the matrix of coal coke. 相似文献