低品位褐铁矿的磁化焙烧

针对河北宣化某难选褐铁矿石,采用SEM和XRD对原矿物性结构及成分进行了分析,并运用磁化焙烧-磁选工艺进行了实验研究并对磁化焙烧-磁选工艺参数进行了优化。物相分析结果表明,该褐铁矿与脉石矿物的镶嵌关系较为复杂,SiO2含量高,运用常规的选矿方法难以分选提纯。实验结果表明,磁化焙烧-磁选工艺可以较好地完成该铁矿石的提纯。对该褐铁矿原矿在焙烧温度为950℃,焙烧时间为15min,配煤量为5%,焙烧矿粒度为150μm和磁场强度为60mT的条件下,可以得到精矿产率为43.68%,铁精矿品位为53.98%,铁回收率83.91%,wSiO2为13.9%的良好指标。     

谈型钢轧辊滚动轴承的润滑和密封

为改善型钢车间轧辊滚动轴承的润滑条件 ,莱钢锻压厂设计了轧辊轴承清洗装置 ,对离线轴承进行清洗检查 ;同时改进轴承的密封结构 ,提高了轴承的使用寿命 ,降低了轴承的烧损 ,提高了轧机的工作效率 ,降低了成本     

载金炭解吸电解工艺方法的分析比较

对近二十年来载金炭解吸电解工艺的三种方法进行了比较，即第一种加温常压解吸电解方法，尽管解吸时间比第二种高温高压解吸电解方法时间长，生产效率低，但由于其设备投资少，成本低，目前仍可适用于小型黄金矿山；采用第二种方法具有生产能力大，解吸效果好等许多优点，比较适用于大，中型黄金矿山；而第三种解吸电解方法介于前二种之间。     

云南文山斗南锰业股份有限公司发展循环经济的思考

循环经济是一种全新的经济发展模式。云南文山斗南锰业股份有限公司是全国优质锰矿基地、重要的铁合金生产基地，产业基础好，发展工业循环经济潜力较大。     

提高大型堆取料机运行稳定性

对悬臂皮带涨紧装置进行了改型,对二尾车液压系统进行了改进,对斗轮体料斗进行了结构改进,并对悬臂皮带增加调偏装置。通过改进大大降低了堆取料机的故障率,使得高炉烧结原料保供系统的稳定性得到了提升。     

Methods of artificial termination of pregnancy with special consideration of the use of prostaglandin (author's transl)

For termination of a pregnancy up until the 12th week, the method of choice is suction curettage. The dilation of the cervical canal is made easier and sometimes the embryo is aborted if a viscid preparation containing Prostaglandin F 22 is injected intracervically 12 hours prior to the scheduled procedure. For termination of pregnancy after the 14th week, prostaglandin is superior to all other methods. It can be used intraamnially, extra-amnially or intravenously. Not enough information and experience is available in Europe regarding the intravaginal application.     

Rate of electrochemical formation of nanoclusters

The electrochemical formation of nanoclusters is considered. The classical thermodynamic and atomistic theories of nucleation are compared. A version is proposed for the atomistic approach of the theory that is suitable for the region of high supersaturations (overvoltages). The concept of the critical cluster of a new phase is analyzed. A method for determining the number of atoms in the critical cluster of a new phase during electrolytic crystallization is suggested.     

Rehabilitation of disorders of the breaking of voice

The adolescent's breaking of the voice is the result of the substitution of the chest voice (or heavy mechanism) for the head voice (or light mechanism). In cases of late breaking, the voice is abnormally high-pitched and feeble, often with a distorted timbre, while the larynx is normal and pubescent. Such people are generally not fully aware of their voices' real nature. Therapy classically resorts to laryngeal manipulations, of which a new technique is put forward. Another therapeutic approach is based, on the one hand, on critical listening compared with a control male voice, thus enabling the subject to become aware of his own voice, and, on the other hand, on high intensity work which helps passing from head to chest voice.     

软锰矿与硫铁矿直接浸出法在湿法炼锌中的应用研究

介绍了广东岭南铅锌集团狮冶化厂湿法炼锌生产中,利用软锰矿与硫铁矿直接浸出以提高锌系统的锰离子含量的原理,实验和生产实践证明了此法工艺稳定,见效快,为湿法炼锌提锰的新措施。     

铝熔体炉内精炼的现状与发展

随着国家要求对电解铝液产业链的延伸,使用电解铝液生产普通产品,甚至双零铝箔、航空航天用铝高端产品是必然趋势。电解铝液中含氢、含碱金属量高,从目前生产状况看,只靠炉外精炼很难达到产品质量要求。本文重点介绍几种炉内精炼技术和工艺装备。     

Classification of the effectiveness of combination treatments

According to FDA regulations, a combination drug is not efficacious unless each component contributes to the claimed effects. For a univariate endpoint, this implies that the combination at specific doses must be superior to each of its components at the same doses. More demanding is the property of synergy, in which the effect of the combination must be superior to the effect expected based on those of its components. If it is equal to those effects, it is additive, and if it is inferior, it is antagonistic. We give regions in the combination dose plane where these concepts are well defined. If the effect of the combination is greater than the greatest effect achievable by any of its components it is therapeutically synergistic. A combination can be antagonistic, yet its components can still contribute to the claimed effects. If it is additive, synergistic or therapeutically synergistic, its components must contribute to the claimed effects. We relate these concepts and provide designs and sequential procedures for determining whether a combination is therapeutically synergistic, synergistic, additive, antagonistic and contributing or antagonistic and non-contributing.     

Analysis of Effect of Gas Temperature on Cooling Stave of Blast Furnace

In order to study the effect of gas temperature variation on cooling stave,temperature,stress and displacement distributions of cooling stave were analyzed respectively when gas temperature inside blast furnace increases from 1000 to 1600℃.The results show that the temperature field on cold side is under control of cooling pipes and hardly changes when gas temperature increases.The temperature gradient and change rate with time near hot sides are greater than those in other regions and the later can reach 100℃/s.The stress intensity near middle area of hot surface is up to 400MPa and that's why there are lots of cracks at this place.The edge of stave is bent to cold side and middle regions between fixed bolts and pin moves to hot side.The displacement around fixed pin is smaller but larger on the edge and the maximum is located on hot side of top surface.The maximum displacement in z direction is about 4mm and 3mm in y direction.If the expansion coefficient of packing layer is 1/4,the thickness of packing layer between the cooling staves is 32mm and 24mm between sides up and down.     

铕的电化学还原过程中钛阴极失活原因之探讨

铕的电化学还原受多种因素影响，其中阴极极板最为重要。研究了采用钛阴极进行铕的电化学还原常遭遇极板失活问题；并对极板失活进行了探讨与分析，认为钛阴极吸氢以及质劣钛材料是妨碍铕的电化学还原的主要原因。提出了钛板脱氢的初步方案，以及尽可能选择质优钛板材料进行铕的电化学还原的建议。     

炼钢厂控制系统改造

Wonderware公司的IAS2.0(Industrial Application Server)作为一种全新的设计理念首次在冶金行业使用,软件和程序设计方面的不足是造成通讯中断的主要原因。我们通过OPC通讯方式增加转炉和精炼炉两台单机操作站,可以做到在原有系统中断的时候不影响生产。此举方法简单,成本低,容易实现,具有积极的经济效益。     

微机在企业备品备件管理中的应用

莱钢锻压厂运用微机对备品备件进行管理，通过采用模块化设计以及设计友好的用户界面，提高了工作效率，加强了备品备件的管理工作。     

ESP内气流均匀性和除尘效率的数值模拟

 基于计算流体力学,以相对均方根（RMS）值为气流均匀性的评判标准,应用FLUENT软件模拟了粉尘粒径、烟气流速、电晕极电压及烟气含尘浓度对静电除尘器的除尘效率和细微尘涡流现象的影响。研究表明,随着粉尘粒径和烟气流速的增大,颗粒合速度增大,RMS值大幅降低,涡流趋势减弱;而随着粒径增大,颗粒的驱进速度增大,除尘效率提高,但烟气流速增加,增大了颗粒的轴向速度,使得除尘效率降低;随着电晕极电压的升高,RMS值增大,涡流趋势增强,但电晕极电压升高,带电颗粒的电场力大幅增加,除尘效率提高。当含尘浓度小于5 g/m3时,随着含尘浓度的增加,由于“电风”的作用使得除尘效率和RMS值均增大,涡流趋势增强;但当含尘浓度超过5 g/m3时,随着含尘浓度的增加,“电风”逐步减弱,RMS值和除尘效率开始下降,涡流趋势减弱。     

Investigation of corrosion processes in aluminum production and development of new methods of protection of metals

In electrolytic aluminum production, anode rods, industrial tools, and gas purification equipment corrode intensely. A high corrosion rate of the tools and equipment in cryolite-alumina melts is found. To decrease the corrosion destruction of operating equipment and anode rods made from ferrous metals, it is suggested to deposit composite chromium coatings. Purification of electrolytic gases from sulfur dioxide is possible by the acidic scheme with obtainment of sulfurous acid. However, this is accompanied by intense corrosion of equipment made from ferrous metals. The possibility of applying corrosion inhibitors, specifically oxazolidines, for protection of gas purification equipment made from steel CT3 that exists in aluminum plants is considered.     

我国贵金属废料回收产业发展综述

分析了贵金属回收利用具有良好的经济效益，国内外对这项工作极为重视，并取得了佳绩。同时，总结了废旧贵金属的主要来源，以及回收新技术。指出，我国废旧贵金属回收体系不够健全，亟待政策扶持。     

结晶器液面自动控制技术的优化

随着高附加值品种钢LX72A的开发和生产,对铸坯内部质量提出了更高的要求,原连铸液面自动控制系统±5mm的精度已经不能适应。对连铸机液面自动控制系统进行的优化,使结晶器钢水液面波动稳定在±3mm之内,铸坯表面和内部质量得到了改善,系统反应速度大大加快,金属料用量大大减少,取得了良好的经济效益。