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…     

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.     

不锈钢电弧炉粉尘直接还原回收工艺研究

电弧炉粉尘巳被列为有害废物，直接还原回收粉尘中有价金属不仅可保护环境，而且可充分利用宝贵的金属资源。采用中频感应电炉模拟电弧炉冶炼工艺进行了A、B、C和D系列实验研究。通过气体成分的检测、钢锭和炉渣的成分分析，了解工艺参数对还原过程的影响，认为电弧炉粉尘直接还原回收工艺切实可行，不影响钢产品质量，为该新工艺的生产实践提供了依据。     

爆破产生后翻的原因及处理方法

本文在分析了爆破产生后翻的原因基础上，提出了改进的方法，并在实际应用中取得了很好的效果。     

脆硫铅锑精矿短回转窑还原造锍熔炼半工业试验

以富含氧化铁的黄铁矿烧渣为固硫剂, 进行了脆硫铅锑精矿短回转窑还原造锍熔炼半工业试验, 取得了铅、锑的直收率分别大于63.50%、88.02%, 固硫率大于95%的实验结果, 表明脆硫铅锑矿还原造锍熔炼工艺是可行的。短回转窑具有可用热效率高, 熔炼强度大的优点, 可作为脆硫铅锑矿精矿还原造锍熔炼的熔炼设备。     

高镍粗铜精炼综合回收镍的途径

本文通过热力学分析，得出高镍粗钢火法精炼过程中“调铜保镍”的技术措施，可使阳极中金属态保留的镍达1．58％，结合生产实践分析总结了高镍粗铜阳极电解过程中独特的技术工艺条件的选择与控制，为在电解液净化中有效地综合回收镍创造了条件。     

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。     

Study on stainless steelmaking dust agglomeration

A new direct recycling technology was developed to recover the valuable metals present in the stainless steelmaking dust and protect the environment. The agglomeration behavior of the dust was analyzed to ensure the requirements of the direct recycling. The main characteristics such as strength, leachability, structure and chemical composition of the pellets were investigated. SEM images show a significant amount of porosities affecting the strength of the pellets and the arrangement of particles in the pellets reveals that no recrystallization bonds are formed, resulting in the poor strength of the pellets. When lignosulfonate is applied as the binder for the agglomeration and the green pellets are dried at room temperature for 60 h, the strong pellets can be obtained without milling the dust. The result of leachability tests shows that the pellets agglomerated can not satisfy the regulations set by the environmental protection agency of US. And it will cause some environmental problems in the long storage of pellets.     

高镍阳极铜电解电铜质量控制

本文从理论上分析了镍在电解过程中的行为,并结合生产实践经验,提出了高镍阳极铜电解的最佳工艺条件。     

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。