有色冶金炉渣热回收利用述评

本文分析介绍了国外一种有色冶金炉渣显热回收利用的成熟工艺。综述了国内有色冶金炉渣热回收利用的现状,初步阐述了国内有色冶金炉渣热回收利用的途径。     

Volatilization of zinc and lead in direct recycling of stainless steel making dust

The volatilization of zinc and lead from the stainless steel making dust pellets in the direct recycling procedure was conducted by using a thermo-gravimetric analyzer and a Tamman furnace in the nitrogen atmosphere respectively. The results show that the temperature has a significant effect on the volatilization rates of zinc and lead,and the carbon content in the pellets has no effect on the volatilization process. The volatilization of zinc is controlled by the chemical reaction between zinc oxide and carbon monoxide, while the volatilization of lead is controlled by the evaporation from liquid phase to the atmosphere. The volatilization of zinc and lead mainly happen at about 1000℃ according to non-isothermal experiment.     

硅凝胶的耐放电性能研究

硅橡胶等硅有机材料以其优良的耐高低温性能、优异的耐高低温性能、耐臭氧、耐光辐照以及适应各种气候条件的优良电绝缘性能广泛地被应用于电工技术领域中。室温硫化硅凝胶(RTV)则是近几年来新发展的一种硅有机产品。它虽然价格昂贵但由于加工工艺方便、电气性能优良,所以已被用于卫星、火箭等空间飞行物的有关设备上。当然,这种以—(Si—O—Si)—为主链的高分子化合物也存在着机械强度差、热     

Heating and melting mechanism of stainless steelmaking dust pellet in liquid slag

The heating and melting mechanisms of the pellets immersed in liquid slag were investigated, and the effect of the pellet heating and the melting conditions were studied. The results show that the dust component in the pellet is melted from the surface and no metallic elements are melted before the dust component, the time for the pellet completely melted is reduced as the iron powder content increases since the metallic iron has high thermal conductivity. These are four stages of heating and melting of pellet in liquid slag, they are the growth and melt of solid slag shell, penetration of liquid slag, dissolving of dust component and melting of reduced metals. The lifetime of the solid slag shell is in the range of 7-16 s and increasing the pre-heating temperature of the pellet and the slag temperature can shorten the slag shell lifetime. The time for the dust component in the pellet to be melted completely is in the range of 20-45 s and increasing the pre-heating temperature, especially in the range of 600-800 ℃, can obviously reduce the melting time. A higher slag temperature can also improve the pellet melting and the melting time is reduced by 10-15 s when the slag temperature is increased from 1 450 to 1 550 ℃. The pellet with higher content of iron powder is beneficial to the melting by improving the heat conductivity.     

钢渣尾渣用于烧结的试验研究

在烧结料中配加适当的钢渣尾渣，通过实验室试验，探讨其用于工业性生产的可行性。     

复杂硫酸盐溶液体系水解制取钛白的热力学研究

本文对复杂硫酸盐溶液体系水解制取钛白的工艺过程进行了热力学估算，对生产过程的进行可提供热力学依据并可判断水解过程中各反应发生的可能性，为工业生产工艺条件的控制提供参考。     

频谱分析法——区分内部、表面、端部等放电的一种新方法(摘要)

1979年 J.P.Reynders曾发表过“PD 脉冲波形分析”一文。本文是在进一步改进了试样制作,对多种材料和绝缘结构进行了试验,获得了不同性质局部放电的脉冲电流波形图后,通过总结、理论分析,继之作频谱分析后撰写的。典型的放电脉冲波形如下图所示。     

分布式粮情检测控制系统的实现

本文介绍了分布式粮情检测控制系统,给出了系统的总体结构,并对系统的硬件配置、软件功能以及系统的安装等作了详细的说明。     

电弧炉粉尘等温还原的动力学研究

为使还原条件与实际电弧炉生产相接近,在等温条件下对电弧炉粉尘球团的还原过程动力学进行了研究。电弧炉粉尘与还原剂碳和粘接剂石灰均匀混合后制粒,经干燥后将球闭置于恒定温度的加热炉中,利用电子称定时对球团重量进行检测。金属还原率的计算中,考虑了球团的失重、铅和锌在高温下挥发。经研究,电弧炉粉尘的还原分为二个阶段,还原初期由化学反应控制而还原后期由扩散控制,并建立了每一阶段的还原动力学方程,确定了有关的动力学参数表观活化能和频率因子。