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.     

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。     

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.     

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。     

Modeling of thermal conductivity of stainless-steelmaking dust pellets

The thermal conductivity of stainless-steelmaking dust pellets, an important parameter for the direct recycling of the dust, is naturally of interest to metallurgists. The measurement of central temperature and surface temperature was taken in a furnace. The physical model and calculation model for the heating process were set up to check the thermal conductivity of the dust pellets. The physical structure parameters δ and γ of the basic unit are 0.92 and 0.45 based on the calculation. The temperature in the pellet can be expressed in a linear equation α5 Tp =α1TN α2TM α4. This is convenient to determine the central temperature of a pellet in the direct recycling process.     

复杂硫酸盐溶液体系水解制取钛白的研究

本文对复杂硫酸盐溶液体系水解制取钛白的过程进行了研究，对为攀枝花钢铁公司炼铁高炉渣的综合利用提供了一条可靠途径。攀钢高炉渣经硫酸分解制得钛液，其中TiOSO4浓度低而杂质量偏高。前人文献认为由这种钛液不能生产出优质涂料钛白，因此水解过程与传统硫酸法相比有不同的规律。经大量实验研究建立了此过程的教学模型，并以此数学模型采用计算机选优确立了最佳工艺条件。可为将来的生产实践提供数据和参考。     

Thermo-analytical study on stainless steelmaking dust

1　INTRODUCTIONStainlesssteelmakingdustisaby productwastegeneratedfromsteelmakingindustry .Itcontainssig nificantamountsofiron ,lead ,nickel,chromium ,etc .Heavymetalmaybeleachedintotheenviron mentbyrainorundergroundwater ,soitisclassifiedashazardouswastesandbannedbeingdisposedinreg ularlandfill[1] .Thevaluablemetalsinthedustcanberecoveredinthewayofdirectrecycling[2 6 ] andtheworthlessdustshouldbetreatedinthewayofvitrifi cation[7] .But,itisnecessarytocommandthether malbehaviorofthedustbe…     

25t/h 直吹式煤粉炉的微机控制设计探讨

本文对２５ｔ／ｈ直吹式煤粉工业锅炉的微机自控系统设计进行了讨论，针对国内某工厂锅炉更新节能改造项目，建立了微机控制系统，以保证锅炉安全运行，提高运行热效率，可为国内中小型锅炉微机自控系统的设计提供参考。     

应用PSpice软件实现虚拟电子技术实验教学

文章从实验教学的实际出发．以功率放大电路和可控分频电路为例阐述在电子技术实验教学中引入PSpice仿真软件的实践效果，此软件的应用，丰富了实验教学手段，解决了一些硬件操作无法或难以解决的问题，达到了理想的实验效果。     

25t／h直吹式煤粉炉的微机控制设计探讨

本文对２５ｔ／ｈ直吹式煤粉工业锅炉的微机自控系统进行了讨论，针对国内某工厂锅炉更新节能改造项目，建立了微机控制系统，以保证锅炉安全运行，提高运行热效率，可为国内中小型锅炉微机自控系统的设计提供参考。