Φ600mm UHP电极焙烧工艺优化的探讨

通过对Φ600 mm UHP电极焙烧生产过程中在负压操作、填充料控制、装出炉工艺、加压焙烧4个方面进行改进,提升了产品品质,降低了生产成本,为今后超高功率石墨电极的生产提供了生产经验和技术支持。     

填充料粒度对石墨电极焙烧效果的影响研究

通过对填充料粒度的影响所造成的石墨电极理化参数的变化进行统计归纳,认为通过合理调节填充料粒度配比,能够有效改善石墨电极焙烧品的理化参数,提高焙烧品尤其是接头产品的合格率。     

提高挤压石墨电极焙烧质量的生产实践

挤压石墨电极生制品焙烧在石墨电极生产工序中承上启下,不但能验证上道工序压型品的质量,又能影响下道工序石墨化品的质量.因生产周期长,影响质量因素多,控制手段不理想,导致质量事故频发.为保证石墨电极生坯的焙烧质量,国内外石墨电极生产企业多采用车底式焙烧炉和带盖环式焙烧炉进行石墨电极生制品焙烧.     

车底式炉在石墨电极二次焙烧中的应用北大核心

在传统的石墨电极生产过程中,一般一次焙烧采用的设备为带盖式环式焙烧炉,再次焙烧采用隧道窑。随着国际技术交流的不断增加,一种既能用于一次焙烧又能用于再次焙烧的设备在国内炭素行业越来越多地被使用,根据其结构形式,将其称为车底式焙烧炉。本文主要就车底式炉在石墨电极二次焙烧中的应用作扼要论述。     

石墨电极一次焙烧品空头原因调查及解决措施

石墨电极焙烧过程中由于配方、配料、焙烧曲线等因素造成一次焙烧品产生空头现象.本文对造成石墨电极一次焙烧品产生空头的原因进行了分析探讨,提出了解决措施,并对措施的实施效果进行了统计.     

车底式炉在石墨电极二次焙烧中的应用

在传统的石墨电极生产过程中,一般一次焙烧采用的设备为带盖式环式焙烧炉,再次焙烧采用隧道窑。随着国际技术交流的不断增加,一种既能用于一次焙烧又能用于再次焙烧的设备在国内炭素行业越来越多地被使用,根据其结构形式,将其称为车底式焙烧炉。本文主要就车底式炉在石墨电极二次焙烧中的应用作扼要论述。1车底式炉1.1概述车底式炉是多个单体设备联合使用的,每一台     

论焙烧对石墨电极质量的影响

焙烧是生产具有优良性能超高功率石墨电极的重要工序。对焙烧炉炉型进行了比较,并深入分析了生坯在焙烧过程中的受热机理,总结了升温速率、黏结剂沥青、温度场等因素对石墨电极质量的影响,为生产高品质的石墨电极提供参考依据。     

缩短电极焙烧时间提高产能的探讨

焙烧工序是石墨电极生产过程中的重要工序之一,也是石墨电极生产过程中生产周期最长的工序.在保证产品质量的前提下,如能够缩短焙烧工序生产周期,或提高每一个升温系统产能,将减少流动资金的占用量,加快资金周转率,降低生产成本,提高投入产出比,增加企业的经济效益,增强企业的市场竞争力,因此,是很值得去进行探讨和研究的.     

一种沥青活化剂在中温沥青中的应用

本文从理论到实践介绍了用硬脂酸作为中温沥青的调节剂，能够降低沥青软化点和粘度，提高焙烧品的残炭率，以达到提高石墨电极的体积密度，降低电阻率，降低CTE以及石墨电极接头不足重率的降低。     

炭素专利

<正>公开号:CN201289308公开日:2009-08-12申请人:中钢集团吉林炭素股份有限公司发明人:陈乃康,隋庆武,潘宏伟发明名称:石墨电极二次焙烧隧道窑门密封机构本实用新型涉及窑部件,是一种石墨电极二次焙烧隧道     

Suppressing propylene carbonate decomposition by coating graphite electrode foil with silver

A method has been developed to suppress the decomposition of propylene carbonate (PC) by coating graphite electrode foil with a layer of silver. Results from electrochemical impedance measurements show that the Ag-coated graphite electrode presents lower charge transfer resistance and faster diffusion of lithium ions in comparison with the virginal one. Cyclic voltammograms and discharge-charge measurements suggest that the decomposition of propylene carbonate and co-intercalation of solvated lithium ions are prevented, and lithium ions can reversibly intercalate into and deintercalate from the Ag-coated graphite electrode. These results indicate that Ag-coating is a good way to improve the electrochemical performance of graphitic carbon in PC-based electrolyte solutions.     

Reprint of “Suppressing propylene carbonate decomposition by coating graphite electrode foil with silver”

A method has been developed to suppress the decomposition of propylene carbonate (PC) by coating graphite electrode foil with a layer of silver. Results from electrochemical impedance measurements show that the Ag-coated graphite electrode presents lower charge transfer resistance and faster diffusion of lithium ions in comparison with the virginal one. Cyclic voltammograms and discharge-charge measurements suggest that the decomposition of propylene carbonate and co-intercalation of solvated lithium ions are prevented, and lithium ions can reversibly intercalate into and deintercalate from the Ag-coated graphite electrode. These results indicate that Ag-coating is a good way to improve the electrochemical performance of graphitic carbon in PC-based electrolyte solutions.     

国产宏特针状焦生产Φ350mm超高功率石墨电极

以国产针状宏特焦为原料采用传统生产流程及国际标准流程生产Φ350mm超高功率石墨电极,并对其生产过程中的工艺进行控制。结果表明,用国产宏特针状焦为原料采用国际标准流程生产Φ350mm超高功率石墨电极,理化指标完全达到用新日铁针状焦为原料生产Φ350mm超高功率石墨电极等同类产品,通过钢厂试用,其抗热震性能、抗氧化性能、消耗性能较好,能完全满足用户的使用要求;同时实现超高功率石墨电极国际标准流程,进一步降低生产成本。     

4种炭素材料的抗氧化性能研究

在熔炼炉中对电极石墨、模压石墨、挤压石墨、等静压石墨4种炭素材料从室温逐渐加热至700℃,并在一定温度下保温1h,测其质量,绘制材料质量变化曲线图,以质量变化表征其抗氧化性的强弱.通过SEM、XRD等手段分析这几种炭素材料抗氧化性差异的本质原因.研究表明,这4种炭素材料的抗氧化性强弱顺序为等静压石墨、电极石墨、挤压石墨、模压石墨,影响石墨材料的抗氧化性能主要因素有石墨材料的石墨化程度、晶体结构缺陷、体积密度及杂质含量等.     

Improved performance of iron-chromium flow batteries using SnO2-coated graphite felt electrodes

Polyacrylonitrile-based graphite felt has the properties of high temperature resistance, corrosion resistance, low thermal conductivity, large surface area and excellent electrical conductivity. It has become the preferred material for flow battery electrodes, but its chemical activity is poor. In order to improve the electrochemical activity of graphite felt electrodes, the electrodes were prepared by SnO₂-coated graphite felt. Scanning electron microscopy and X-ray photoelectron spectroscopy were used to analyze the microscopic morphology of SnO₂-coated graphite felt electrodes. Electrochemical impedance spectroscopy, cyclic voltammetry and charge-discharge tests were performed using an electrochemical workstation to investigate the electrocatalytic activity of SnO₂-coated graphite felt electrodes and their cell performance. The results show that the SnO₂ coating on the graphite felt surface forms a convex and concave microstructure, which further increases the specific surface area of the electrode, and at the same time successfully introduces oxygen-containing functional groups to the electrode surface, increasing the electrochemically active spots on the surface. In addition, the presence of oxygen defects in the SnO₂ crystal structure provides more electrochemically active sites and improves the electrochemical performance of the graphite felt electrode. At a current density of 142 mA cm^?2, the charge-discharge capacity of the battery assembled with the SnO₂-coated graphite felt electrode was significantly improved; when the current density was 250 mAcm^?2, the Coulombic efficiency of the electrode (TGF-2) coated with a concentration of 0.1 M could reach 84%.     

羟基自由基对全钒液流电池石墨毡电极的性能影响

采用H2SO4和H2O2的分解产物羟基自由基,对石墨毡电极进行表面处理。循环伏安法和交流阻抗测试显示,处理后石墨毡的阴阳极峰电流分别提高160.96%和120.24%,极化反应电阻从74.95 Ω·cm2显著降低至18.92 Ω·cm2。红外光谱测试表明石墨毡处理后表面含有大量含氧亲水基团,拉曼光谱测试结果显示处理后石墨毡的石墨化度降低,进一步证明了石墨毡电极表面受到了不同程度的氧化。X射线光电子能谱测试显示石墨毡处理后的含氧量提高0.58%,定量地证明了红外光谱和拉曼光谱的测试结果。采用自制静态单电池对石墨毡电极进行测试,处理后石墨毡的充放电容量分别提高37.04%和22.22%,表明该方法处理石墨毡电极能够显著提高全钒液流电池性能。     

改进石墨电极质量与降低电极消耗的探讨

综述炼钢用石墨电极在工作中消耗的主要原因,分析了电极消耗和电极质量的关系。指出了原材料质量的重要性;提出了添加炭纤维改善电极强度,改进电极接头形状,减少接头故障;使用超声波技术监控电极质量等措施。     

普通石墨材料用Al_2O_3涂层抗氧化性能研究

以普通石墨电极为例,设计并制备了氧化铝高温抗氧化涂层。采用氧化失重分析法对有涂层和无涂层石墨电极进行对比研究,同时采用扫描电镜对涂层的形貌进行观察。研究结果表明,700℃时,无涂层石墨电极的氧化失重率已经是有涂层石墨电极的10.7倍;涂层与石墨基体之间没有形成明显的扩散层。在实际使用过程中,涂层能够很好的阻止氧气向石墨基体表面扩散,大大降低了石墨材料的氧化损耗。     

碳源对Al2O3-SiC-C质铁沟浇注料性能影响的研究进展

本文综述了沥青、炭黑、焦炭和石墨等常规碳源,表面改性碳以及新型碳源对Al₂O₃-SiC-C质铁沟浇注料性能影响的研究概况。沥青在Al₂O₃-SiC-C质浇注料中发挥着重要作用,其加热软化后渗透或挥发、凝结到浇注料的缝隙或气孔中,可以增强颗粒之间的结合,改善高温下液相分布,避免过烧结,显著提高浇注料的抗渣性能。炭黑粒度细小,可充分填充空隙,降低烧后试样的气孔平均孔径,改善高温下抗侵蚀性。炭黑、焦炭和石墨等常规碳源适合作为附加碳源和沥青配合使用,达到互补的效果。表面改性碳中造粒石墨具有较好的应用效果,可大幅提高Al₂O₃-SiC-C质铁沟浇注料中鳞片石墨的引入量,显著提高抗渣性能。新型碳源中含碳树脂粉Carbores P配合沥青添加到Al₂O₃-SiC-C质铁沟浇注料中可有效提高铁沟服役寿命。     

The effect of graphene nanosheets as an additive for anode materials in lithium ion batteries

A small amount of graphene nanosheets was added to commercial graphite as an anode active material in lithium ion batteries and its effects were examined through a variety of physical and electrochemical characterization techniques: FE-SEM, XRD, Raman, BET, and EIS. Compared to a commercial graphite electrode, a composite electrode containing 1 or 5 wt% graphene nanosheets showed higher reversible capacity and enhanced cyclability. This was attributed to the large surface area and low charge transfer resistance of the graphene nanosheets.