浅谈球磨粉布朗值稳定性控制及对阳极质量的影响

球磨粉料是配方中影响粘结剂的主要因素,球磨粉料控制稳定才能保证粉料与粘结剂形成的"胶料"稳定,制成塑性较好的糊料。糊料是成型生坯质量的前提;生坯质量是炭阳极质量的关键因素。离开粉料就形成不了炭阳极制品,忽视粉料的作用及其控制就生产不出高质量的产品。球磨粉的稳定对炭阳极的体积密度、电阻率和空气渗透率起决定性作用。     

炭阳极生坯裂纹行为

本文对炭阳极生坯裂纹进行分析，指出炭阳极生坯裂纹与制品形状、配方、糊料温度、沥青性质、冷却方式和冷却程度间的联系，并根据生产情况提出相应解决方法。     

分析生阳极质量的影响因素

为了提高成型生阳极的质量,分析生阳极生产工序中干料预热温度、糊料混捏温度及时间、混捏设备、生产配方、粘结剂、糊料的冷却、振动成型过程等主要因素对生阳极质量的影响,找出解决措施,来达到提高预焙阳极质量的目的。     

提高间歇式混捏锅混捏质量的途径

通过对预焙阳极生产过程中混捏工序存在的影响因素进行分析,从工艺技术条件优化、设备等方面进行了改进,解决了糊料夹干料、配方改变、糊料塑性差等问题,混捏质量得到明显提高,预焙阳极生块合格率由原97.2％提高到99.2％。     

关于生阳极质量的探讨

通过对某公司阳极生产工艺进行分析,结合生阳极生产和质量控制的研究成果,探讨了原料质量、工艺配方、干料预热、糊料混捏、糊料冷却、振动成型等生产工序对阳极生产质量的影响.     

关于生阳极质量问题的探讨

本文通过对某公司阳极生产工艺进行分析,同时结合生阳极生产和质量控制的研究成果,探讨了原料质量、工艺配方、干料预热、糊料混捏、糊料冷却、振动成型等生产工序对阳极质量的影响。     

炭素生产中煅烧、配料几点问题探讨

本文作者分别就对发素生产实践中的骨料配方、粘结荆添加量、煅后焦真密度、骨料振实容重、粒度分布等问题的几点认识。与传统的炭素理论的不同之处发表个人观点，供大家参考。     

电解铝炭阳极的消耗分析

计算了铝电解过程中炭阳极的理论消耗,并与实际消耗量进行了比较,炭阳极利用率只有87％左右.分析了导致炭阳极多耗的原因,以及炭阳极多耗对铝电解生产的影响.重庆天泰铝业穿孔阳极两年多的工业试验表明其可以降低阳极净耗,提高炭阳极利用率.文章最后还提出了降低炭阳极消耗的几条建议.     

料层厚度对还原钼粉性能的影响

系统研究了不同料层厚度对还原钼粉性能的影响，结果表明：随料层厚度增加，还原钼粉的松装密度、振实密度和氧含量增大，而平均粒度减小。     

预焙阳极空气渗透率影响因素分析

在国际炭阳极质量标准当中,空气渗透率是反映预焙阳极质量的一项重要指标,但国内质量指标尚未纳入。在当前电解普遍强化电流的情况下。预焙阳极的空气渗连率对电解过程中阳极的过重消耗有着重要的影响。本文从石油焦质量、粘结剂质量、煅烧工艺控制、干料配比和粘结剂用量、生阳极焙烧等方面分析探讨了影响预焙阳极空气渗透率的因素,并提出了降低预焙阳极空气渗透率的措施．包括对原料的优选混配、煅烧工艺改进、配方优化、焙烧质量提高等。     

Effect of carbon recycle materials on properties of bench scale prebaked anodes for aluminum smelting

Bench scale aluminum smelting anodes were produced from aggregates having butts contents of 0 to 40 wt pct, from 100 pct mixer scrap or 100 pct green anode scrap, and from aggregates having used potlining contents of 0 to 25 pct to determine effects on important properties. Butts additions increased baked apparent density, decreased electrical resistivity, baking shrinkage, and thermal shock cracking resistance, and had little effect on excess carbon consumption. Use of 100 pct mixer scrap was equivalent to use of freshly blended coke and pitch. Use of 100 pct green anode scrap increased baked apparent density, decreased electrical resistivity, and may have reduced carbon consumption. Additions of used potlining increased carbon consumption, had little effect on electrical resistivity, and had a variable effect on thermal shock cracking resistance.     

NiFe_2O_4基惰性阳极的润湿性及气泡析出行为

利用座滴法和双室透明电解槽对NiFe2O4基惰性阳极的润湿性和气泡析出行为进行研究。结果表明,电解质对NiFe2O4基惰性阳极的润湿性要优于碳素阳极。在低电流密度情况下电解,阳极气泡的析出是一个动态过程,它先在阳极表面形核,以球形方式长大,小气泡在长大过程逐渐汇聚偏移,然后逸出。惰性阳极上析出的气泡尺寸比碳素阳极小,在阳极上的逗留时间也更短。大电流密度情况下,气泡的生成速度加快,尺寸降低,很难准确测量气泡的直径。     

高强度球扁钢感应加热有限元模拟与工艺优化

基于实际生产工况参数，利用ABAQUS有限元分析软件，对高强度球扁钢的感应加热过程进行二维模拟，模拟结果与实测结果基本一致。探究了线圈电流密度对球扁钢截面温度分布的影响，提出了球扁钢感应加热工艺参数优化方案。模拟结果的推荐工艺参数为：预热电流密度为7.0×106 A/m3，加热电流密度为8.5×106 A/m3。对优化工艺参数前后的高强度球扁钢进行显微组织和力学性能比较，结果表明,优化感应加热工艺参数后的高强度球扁钢具有更好的截面均匀性。     

锌电积用惰性阳极材料的研究现状

锌电积长期采用Ph—Ag合金为阳极。该阳极存在析氧过电位高、易腐蚀且污染阴极锌等问题,因此人们研究了各类新型阳极。阐述了国内外铅及铅合金阳极、复合电催化铅基阳极、钛基DSA阳极及其他基体阳极材料的研究现状,着重指出了铝基阳极材料具有较好的发展前景,并对未来锌电积用惰性阳极材料的发展趋势进行了展望。     

高钾电解质体系下阳极品质和锂钾含量对炭渣量的影响

长期跟踪了某电解铝企业电解槽的运行过热度、不同炭阳极运行期间的炭渣量和电解质中含碳量,开展了电解质组分调整试验,跟踪分析了炭渣量和运行过热度随锂钾含量变化的过程。结果表明,高品质阳极能够明显降低炭渣量和电解质中的含碳量。电解运行过热度偏低,炭渣量偏高可能是高钾低锂电解质体系的特征,降低电解质中钾含量、适当提高锂含量,能够提高电解运行过热度,降低炭渣量。阳极质量、电解质中锂钾含量、运行过热度、阳极覆盖料中的含碳量都是影响电解过程中炭渣产生量的重要因素。     

基于干法除尘灰返回转炉的应用实践

为了提高冷固球团返回转炉中的利用效率和降低冶炼原料成本,分别对除尘灰原料和生产工艺、冷固球团的生产以及冷固球团在转炉的应用实践3部分内容进行分析。研究结果表明,干法除尘灰含铁量较高,其中粗灰的含铁量最高可以达到89.94%,可选用淀粉胶作为生产冷固球团的黏结剂;冷固球团成型的关键之一是加入适量的水进行消化,实际生产中应控制加水量为5%~7%、消化时间为8~12 h。通过实践证明,冷固球团加入转炉后具有明显的冷却和化渣效果。通过冷固球团的使用效果研究表明,冷固球团能减少副原料消耗和提高金属使用率,一年可以增效益4 903.64万元。     

Studies on the corrosion and the behavior of inert anodes in aluminum electrolysis

The corrosion rates of inert anodes based on tin oxide and nickel ferrite cermet materials were studied as a function of some operating parameters. To reach a better understanding of the corrosion mechanism, the behavior of the anodes was observed under some specific conditions, such as in pure cryolite, at high current densities, at different potentials, and at varying cathode surface areas. It was confirmed that low alumina concentrations led to catastrophic corrosion of the anodes and that high current densities and high as well as low NaF/AlF₃ molar ratios were also detrimental. The corrosion rate of tin oxide based anodes showed a minimum (so-called “normal corrosion”) at anodic potentials of 2.2 to 2.4 V with respect to aluminum. The normal corrosion is due to chemical dissolution of the anode material and reduction of the corrosion products into the cathode metal. The corrosion rate increased with increasing cathode surface area. At potentials higher than ～2.5 V, the anodes showed catastrophic corrosion. Catastrophic corrosion can be ascribed to decomposition of the anode material by depletion of alumina at the anode surface provoked by low bulk concentration of alumina and/or high current density.     

Corrosion of Zinc Ferrite Based Inert Anodes in AlF3-NaF-Al2O3 Melts Under Conditions of Anodic Polarization

ZnFe2O4-based inert anodes were made to conduct the aluminum electrolysis tests. The corrosion behaviors of the inert anodes were examined and discussed. Experiment results prove that: (1) ZnFe2O4-based inert anodes are good corrosion resistant to AlF3-NaF-Al2O3 melts under the conditions of anodic polarization; (2) High anodic current density(＞1.5 A·cm-2), high alumina concentration and low ratio of NaF/AlF3 in the molten salts will be the most important conditions for using inert anode.     

连退工艺对低合金高强钢HC300LA力学性能的影响

为了研究热处理工艺对低合金高强钢力学性能的影响,在连续退火条件下对HC300LA钢进行了模拟试验和工业试验。采用连续退火模拟试验机模拟连退生产工艺,研究了退火温度对低合金高强钢HC300LA力学性能的影响,获得了不同强度要求的试验钢。在实际生产过程中,分别研究了不同均热时间、快冷冷速条件下低合金高强钢HC300LA的力学性能变化情况。试验结果表明,随着退火温度的提高,低合金高强钢的强度下降,断后伸长率有所提高;随着均热时间的延长,低合金高强钢的强度有缓慢下降的趋势;随着快冷冷速的增加,低合金高强钢的强度增加,断后伸长率逐渐降低。     

Effect of titanium additives on carbon anode reactivity

In order to ascertain the impact of titanium additives on carbon anode reactivity, different titanium content of carbon anodes were prepared with the single factor experimental method, and test its reactivity in CO₂ and air atmosphere respectively. The micro structure of carbon anodes and pitch cokes were tested by XRD. The pyrolysis process of pitch was tested with the TG-DTG method. The results show that the residual rate and chalking rate of carbon anode can also be significantly improved by increasing titanium content. Titanium additives can refine the crystallite size of carbon anode, promote the asphalt carbonization. The titanium additives can increase the apparent activation energy and pitch coke yield of the pyrolysis process, when the titanium content is 1.5%, E _a is 56.405 KJ/ mol, reaction order is 6.4, and the rate of pitch coke yield is 50.5%.