不锈钢电弧炉粉尘加热过程的TGA及FTIR分析

本研究采用热重分析仪(TGA)和傅里叶变换远红外气体分析仪(FTIR)检测了不锈钢电弧炉粉尘的加热过程,确定了加热过程中粉尘热性质变化的3个阶段.第1阶段表现为失重,它是由水分的蒸发以及粉尘中的游离碳与金属氧化物作用所致.第2阶段表现为增重,粉尘中的金属与空气中的氧发生氧化反应.第3阶段为缓慢失重过程,粉尘中部分金属挥发进入气相.研究结果可为不锈钢电弧炉粉尘的直接回收及固化处理提供数据.     

高镍粗铜火法精炼过程中“调铜保镍”的技术措施

本文通过热力学分析、得出高镍粗铜火法精炼过程中“调铜保镍”的技术措施：氧化期控制１２００℃以上较高温度，还原期脱氧限度降至０．０５％，阳极中以金属态保留的镍可达１．５８％。生产实践表明采取上述技术措施，可浇铸出物理规格光亮平整化学成分符合要求的铜阳极板，为电解精炼后以ＮｉＳＯ４的形式综合回收镍创造了有利条件     

Kinetics of isothermal reduction of stainless steelmaking dust pellets

The stainless steelmaking dust pellets were reduced in isothermal temperature condition simulating the direct recycling practice in the stainless steel production and the kinetics of the reduction process was investigated.The pellets were formed after mixing the dust with carbon as the reducing agent and dolomite as the binder and smelting flux. An electric furnace was used to heat the pellets and an electrical microbalance was used to check the mass of the pellets in the reduction process. The reduction rate was calculated according to the data of pellet mass change in consideration of the evaporation of moisture, zinc and lead at high temperature. The results of the experi-ments show that the reduction process is in two consecutive stages. The reduction kinetic models were set up for each stage and the kinetic parameters such as activation energy and frequency factor were determined. The apparent activation energy of the first stage is 21.69 kJ/mol, and this stage is controlled by chemical reaction. The apparentactivation energy of the second stage is 17.35 kJ/mol, and this stage is controlled by the diffusion of carbon monox-ide through the resultants of reaction.     

有色冶金炉渣热回利用述评

本文介绍介绍了国外一种有色冶金炉渣显热回收热利用的成熟工艺。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。     

Thermal solidification of stainless steelmaking dust

Stainless steelmaking dust makes an environmental problem in the disposal or landfills and has been assigned as a hazardous waste by various government regulatory agencies because it leaches heavy metals to the groundwater or rainwater in the concentrations exceeding the environmental guidelines for solid waste disposal. Solidification of the dust is to stabilize the hazardous components into amorphous silica-alumina-based clays. Various mixtures of stainless steelmaking dust and clay were investigated and the softening temperatures of these mixtures were measured. The results indicate that the mixture of stainless steelmaking dust and clay additive with 1：1 ratio has the lowest softening temperature of I 100 ℃. The clinkers can pass the TCLP leaching test after being thermally treated at the softening temperature for 15 min. A thermal process for the solidification of stainless steelmaking dust with typical clay is developed and the product is desirable for the production of bricks or disposal and landfill.     

国外电弧炉炼钢的最新进展

介绍了国外电弧炉炼钢的最新进展,对比了正被使用和将被采用的不同炉型如单级和双级的ＡＣ与ＤＣ电弧炉以及连续作业的电弧炉,并对其冶金原料,生产工艺、节能、电极材料消耗和自动化控制程度等进行了介绍。随着环保霜求的日益严格,电弧炉烟尘的治理也越来越受到重视。     

电弧炉粉尘的治理

电弧炉粉尘含有某些重金属元素 ,堆放填埋对环境造成污染。至今已有约 2 0种方法处理这类粉尘回收有价金属 ,尤其是近几年来出现的 Ausmelt,Met Wool,Enviroplas,All Met,IBDR- ZIPP,Modified ZINCEX,Cashman,Rezada和 Rerra Gaia等技术正逐步趋于成熟。不锈钢和特种钢电弧炉粉尘中有价金属的综合回收虽未标准化 ,但越来越受到人们的关注。     

不锈钢电弧炉粉尘的物理化学特性及形成机理探讨

本研究采用多种实验检测方法分析了不锈钢电弧炉粉尘的物理特征和化学特性。扫描电镜分析结果显示粉尘的形貌特征为聚合颗粒；X射线荧光仪（XRF）和ICP分析结果说明粉尘的化学成分随电弧炉冶炼炉料的不同而改变；X射线衍射（XRD）及波形分析确定了粉尘的物相组成，尤其明确了铬在粉尘中以CrO和FeCr2O4的形式而不是以Cr2O3的形式存在；电子探针（EPMA）分析了粉尘内主要元素的分布，有利于粉尘在冶炼过程的形成机理的探索。研究结果可为不锈钢电弧炉粉的控制、处理及综合利用提供数据。     

库房温湿度计算机控制方案的探讨

针对烟叶库房温湿度的控制要求和通风除湿设备设置方式的差异,探讨了几种不同的库房温、湿度计算机控制方案.通过比较,提出了最优的控制方案,以期达到最佳控制效果,降低原料消耗,满足生产需要.