不锈钢粉尘综合利用现状及研究进展

介绍了国内外不锈钢粉尘的处理工艺,对等离子工艺、Inmetco工艺、Fastmet/Fastmelt工艺、STAR工艺等几种代表性工艺的优缺点做了对比,并重点阐述了一步还原直接回收工艺,对该工艺所面临的问题展开了讨论。     

浅谈电解烟气净化系统的能耗

分析了电解烟气净化系统的能耗构成,引风机是净化系统主要的动力源.在满足环保排放标准的要求下,应通过减少净化系统的烟气量和降低系统的压力损失来减少净化系统能耗,并最终将净化系统的能耗控制在铝厂综合交流电耗的1.3％以下.     

Reduction mechanism of stainless steelmaking dust and carbon pellets

1 INTRODUCTIONThe smelting temperature generally reaches1 600 ℃or higher in stainless steel making opera-tion. Under this condition,approxi mately 1 % 2 %(mass fraction) of the scrap charged into the fur-nace is converted to dust[1]as by-product of steel-making process .It has been assigned as a hazard-ous waste and banned from landfills by variousgovernment regulatory agencies because it containsa lot of heavy metals such as zinc ,lead,cadmium,chromium and nickel , which will be leached …     

不锈钢粉尘含碳球团还原机理的探讨

为研究不锈钢粉尘含碳球团的还原机理,比较了含碳球团熔化速度和其中金属还原速度的相对大小,结果表明球团的还原速率大于熔化速率,渣对还原和熔化速度都有促进作用,含碳球团在AOD炉的第一个还原阶段末期加入时,金属的还原率最高。通过分析碳在渣和钢液间的迁移规律确定了碳有向渣中迁移的趋势;并估算了渣的粘度约为0.254Pa.s,渣钢间界面张力约为490mN/m。     

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.     

电解车间残极氟化物无组织排放状况的分析及措施

电解铝厂主要污染是电解车间的无组织排放,而无组织污染中残极排放占有较大的比重。本文重点论述残极污染物排放的防治措施,通过设立残极冷却收集系统的形式减少车间的无组织排放。     

阳极焙烧烟气治理技术分析及解决方案

分析了焙烧烟气的特点,以及目前以电捕焦油器为核心设备的不同焙烧烟气净化处理方法在处理沥青烟、二氧化硫、苯并芘等方面所面临的问题,提出了蓄热式焚烧炉(RTO)+循环流化床焙烧烟气一体化处理方法,从根本上解决焙烧烟气多种污染物难以协同治理的问题。     

降低电解铝生产中氟化盐消耗的实践

氟化盐的消耗是电解生产中的一个重要指标。本文分析了某厂电解生产中氟化盐消耗的主要因素与影响氟化盐消耗的各种可能原因从而给出降低消耗的方法,使氟化盐消耗能降低2kg/t-Al～3kg/t-Al达到节约运行成本,同时也能有效的降低氟化物的排放。     

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.     

铝电解车间烟气无组织排放监测方法的探讨

本文对铝电解车间氟化物无组织排放的人工监测和在线监测方法进行分析和研究,提出在线监测与人工监测相配合的电解车间无组织排放监测方法。根据无组织排放监测数据,可以进一步确定满足无组织排放要求下最小系统风量,在满足电解车间氟化物排放标准的同时降低净化系统能耗。此外,监测数据与电解生产相对照,可以有效指导电解生产操作。