降低铝电解槽焦粒焙烧冲击电压的试验研究

分析了预焙铝电解槽焦粒焙烧启动过程中造成冲击电压高的原因及不利影响,进行了降低焙烧通电冲击电压的试验研究。研究结果表明,改进焦粒的组成、用焦粒筛铺设焦粒以及通电初期电流合理分流,可降低焙烧冲击电压,提高电解槽焙烧质量。     

大型预焙铝电解槽焦粒焙烧技术的改进

本文介绍了某铝业公司大型预焙铝电解槽焦粒焙烧技术的应用和发展,以及焦粒焙烧技术的一些实践经验。     

预焙铝电解槽焦粒焙烧启动方法探讨

本文主要针对大型预焙电解槽在焦粒焙烧过程中存在的一些问题和一些关键技术作初步的探讨．并结合实际生产对今后的改进方向提出建议．完善铝电解槽焙烧启动技术．有利于延长电解槽寿命。     

铝电解槽焦粒焙烧软连接装置

一种铝电解槽焦粒焙烧软连接装置，其特征在于有一由若干层金属薄片组成的导电软带，在软带的一端固定连接一阳极母线U形卡具，另一端固定连接一阳极导杆U形卡具；阳极母线U形卡具通过其紧固螺栓可安装于阳极母线上；阳极导杆U形卡具通过其紧固螺栓可安装于阳极导杆上。该软连接装置能有效改善电解槽焙烧局部温升的均匀性、改善局部导电的均匀性；大大降低工人的劳动强度并且降低对阳极制造质量的要求。     

异型阴极铝电解槽电解质-焦粒焙烧启动技术实践及分析

分析了铝电解槽常用的焙烧启动方法的优缺点,详细介绍了重庆天泰铝业300 kA异型阴极铝电解槽电解质-焦粒焙烧启动方法并与常用方法进行了对比分析,实践证明异型阴极铝电解槽采用电解质-焦粒焙烧启动效果更好。     

400kA异型阴极结构预焙铝电解槽焦粒焙烧启动技术与管理

介绍了400kA异型阴极结构预焙电解槽的焦粒焙烧启动技术及管理,提出了异型阴极结构预焙电解槽焦粒焙烧启动及管理的一些实践经验和技术方法,实践证明焦粒焙烧启动方法在异型阴极结构预焙电解槽上是可以推广应用的,而且效果良好。     

一种新型铝电解槽焙烧工艺的探讨

在国内外关于铝电解槽焙烧工艺技术的实践应用基础上,结合关铝公司生产实际,本文对几种焙烧工艺进行了分析和比较。提出一种焙烧效果及节能更好的新型“电阻丝加热”焙烧工艺。     

电解槽焙烧启动浅析

通过对电解槽整个焙烧启动过程分析，重点通过分析阳极电流分布和槽电压变化规律，使我们不仅仅停留在实践经验的总结，而且能够从理论角度分析问题出现的原因，采取适当措施避免问题发生，同时对焦粒焙烧启动过程中一些现场经验的总结，使管理人员能够快速掌握电解槽焦粒焙烧启动方法。     

160KA大型预焙槽焦粒焙烧启动工艺实践

本文通过在160KA大型预焙槽上应用焦料焙烧启动工艺的实践,介绍了在焦粒的选择,铺设和分流器的制作等方面的情况,通过对各种数据的分析比较对焙烧,启动过程进行了初步的分析探讨。     

浅谈异型阴极铝电解槽的焙烧技术

铝电解槽在快速推广应用异型阴极技术之际,传统的启动前焙烧技术由于阴极结构的变化成为制约本项技术发挥优势的重要技术瓶颈,行业内在用的或新开发的铝电解槽铝焙烧方法,探讨如何通过优化更适于异型槽的焙烧。     

铝电解槽焙烧与启动过程中的危险源辨识与评价

铝电解槽投产要经过焙烧与启动过程,此过程中危险源多,员工极易受到粉尘、毒气、高温、噪声的危害,并存在机械伤害、坠落、灼伤、触电、车辆伤害等隐患.本文对焙烧与启动过程中的危险源进行辨识,并用预先危险分析法对其进行评价,提出了具体的安全防范措施.     

Agglomeration of particles during roasting of zinc sulfide concentrates

This study was undertaken in an attempt to explain the agglomeration of zinc concentrate particles that occurs during fluid bed roasting. In order to simulate extensive particle contact, pure ZnS, FeS, and (Zn, Fe)S particles were roasted in a fixed bed at temperatures between 1223 K and 1323 K using an argon-oxygen gas mixture withP _O2 = 0.21 atm. The results were compared to the reaction products and morphology of an agglomerated commercial concentrate. The reactants were contained in MgO crucibles suspended in a thermobalance and the weight change was recorded as the reaction proceeds. The resulting data were used to identify the specific reaction that takes place for each of the reactants. Products were identified by X-ray diffraction analysis. The morphology of the products was analyzed using SEM and confirmed that the formation of a liquid phase composed of a solution of Fe-S-O causes particles to stick to each other, thus causing agglomeration. This phenomenon was observed for both the FeS and (Zn, Fe)S samples but not for the ZnS. The morphology and the X-ray diffraction pattern of the reaction products of the synthetically prepared (Zn, Fe)S showed remarkable similarity to that of the roasted industrial concentrate.     

铝电解生产中降低炉底电压降的研究与探讨

结合生产实践,分析了影响210kA预焙电解槽工作电压的主要因素之一为炉底压降,论述了导致炉底压降大的原因以及降低炉底压降的措施。     

铝电解生产中强化电流降低槽电压的效果

160kA电解槽强化至172kA后，设定电压保持在4．11-4．13V，槽况稳定。试验槽通过两个阶段的试验。由最初的4．12V逐步降至目前的4．05V。通过对试验槽降低电压的过程进行分析总结，为同类型槽降低工作电压提供了一定的借鉴。     

焙烧制度对稀土精矿中铁、铝等杂质浸出行为的影响

以来自赣南某稀土冶炼企业的离子型稀土精矿为原料,应用电感耦合等离子体发射光谱仪、X射线衍射分析技术等手段,考察了焙烧温度、焙烧气氛对稀土精矿中铁、铝等杂质元素浸出的影响规律,并揭示了其作用机制。结果表明:氧化焙烧能降低铁、铝等杂质元素的浸出,特别是当焙烧温度超过1 300 ℃后,铁、铝浸出率不足5%,而还原焙烧不利于铁、铝等杂质固化,这是由于在氧化焙烧条件下,稀土精矿中铁、铝、硅等元素由易溶解的非晶物相转化为难溶的结晶物相,使得铁、铝等杂质多以含铝多元硅酸盐的形式被固化,从而抑制了铁、铝的浸出。无论是氧化焙烧,还是还原焙烧,在实验所考察范围内,焙烧温度对稀土浸出率影响不大。      

Mechanical alloying of aluminum alloy with nanodiamond particles

The shape, size, and microhardness of composite materials based on an Al-2Cu-1.6Mn-0.4Zr alloy (wt %) reinforced with nanodiamond particles in an amount of 0–10 vol % depending on the duration of mechanical alloying (MA) are investigated. The maximal treatment time in a planetary mill is 15 h. It is shown that, as the MA time increases, the average granule size of composite materials fabricated using chips matrix particles of about 1000 μm in size decreases to 30 μm. During MA, the material microhardness increases to 270–320 HV.     

Cast aluminum alloys containing dispersions of zircon particles

A process for preparing Al-alloy castings containing dispersions of zircon particles is described. Composites were prepared by stirring zircon particles (40 to 200 μm size) in commercially pure Al (99.5 pct)* and Al-11.8 pct Si melts and subsequently casting these melts in permanent molds. It was found to be necessary to alloy the above two melts with 3 pct Mg to disperse substantial amounts of zircon particles (25 to 30 pct). Further, it was possible to disperse up to 60 wt pct zircon by adding up to 5 pct Mg; however, the melts containing above 30 wt pct zircon showed insufficient fluidity for gravity diecasting and had to be pressure diecast. Microstructural studies of cast composites indicated the presence of a reaction zone at the periphery of zircon particles, and electron probe microanalysis showed concentrations of Mg and Si at the particle-matrix interface. Hardness, abrasive wear resistance, elastic modulus, 0.2 pct proof stress, and tensile strength of cast Al-3 pct Mg alloy were found to improve with the dispersions of zircon particles. Scanning electron micrographs of abraded and fractured surfaces did not show any evidence of particle pull-outs or voids at the particle matrix interface, indicating strong continuous bonding.