Furnace for processing scrap and waste products

The company METPROMMASh has been developing and introducing metallurgical technologies and equipment for the nonferrous metals sector for more than 10 years. A particular focus of the company has been the construction of furnaces for recycling aluminum-and copper-bearing scrap and waste products. Furnaces made by METPROMMASh are currently being used by shops and factories that recycle nonferrous metals, these furnaces being suited for recyclers that process from 100 to 2000 tons of scrap a month. The furnaces are built on the grounds of the customer’s scrap storage facility after the most efficient location has been chosen for the metallurgical and auxiliary equipment, the system for handling the movement of materials has been planned, and the feasibility of further processing of the recycled metal has been determined. Depending on the composition of the metallurgical equipment, a recycling complex can be built in a minimum of four months on an area 300 m² or larger. __________ Translated from Metallurg, No. 4, p. 45, April, 2006.     

Modern technologies for processing ferrous and nonferrous scrap metal

This article discusses the advantages of medium-frequency induction furnaces and refining units based on them that can be used to refine both ferrous and nonferrous metals. Due to automation of the processes that take place in these furnaces and reductions made in atmospheric emissions and noise level’ they are highly efficient and cost-effective’ consume small amounts of electric power’ and are convenient and safe to operate. The induction refining units made by the company RELTEK can be built with automatic charging and weighing equipment that will not only reduce staffing requirements but also accurately account for the metal that is remelted. Automation of furnace-charging increases these units’ productivity by shortening the amount of time spent on auxiliary operations.     

铝箔剪切机碎屑收集管优化设计

传统铝箔剪切机碎屑收集装置存在2支管吸力不均匀问题,严重影响剪切机工作效率.文中使用计算流体力学方法(Computational Fluid Dynamics,CFD)对管路挡板结构进行了优化改进,在深入分析挡板布置方式对支管流态影响规律基础上,给出管路优化建议.数值结果表明:2个挡板高度相等时,第2个挡板会对第1个支...     

连铸方坯火焰切割机适应性改造

冷钢STEL-TEK型2#3#连铸坯切割机采用的是火焰切割机。原切割机零部件易坏,难于维修、操作,不能有效地应对铸坯跑偏以及在生产中难于更换切割枪等。为此采取了一些措施,对切割机进行了适应性改造。结果表明,改造后的系统运行稳定,故障率低。     

板坯连铸火焰切割机的电气改造实践

针对板坯连铸火焰切割机存在的问题，采用先进、适用的现代控制技术，通过有效地改造，最终满足了工艺技术要求，其各项技术指标显著改善。     

论铅业的废铅资源

采用废铅指数(S)作为衡量废铅资源状况的指标,简明地分析了铅产量变化、废铅回收状况与S值之间的关系。结果表明,铅产量增长,会造成废铅资源短缺;反之,产量下降,废铅资源将比较充足;产量不变,废铅资源状况介于以上二者之间。废铅实得率愈高,废铅资源愈充足。根据统计数据,估算了1990～2000年间中国、瑞典、美国的S值,讨论了这三个国家S值不同的原因及其今后可能发生的变化。     

Supplying steel scrap for electric steelmaking in Russia

This article reports on the steel-scrap balance in Russia and analyzes the demand for this resource from the steelmaking industry, as well as the potential sources of steel scrap. It is shown that the continuing growth of electric steelmaking in Russia will soon be challenged by shortages of steel scrap in the market and the need to more thoroughly process the scrap that will be available. Calculations show that when it is necessary to charge additional steel scrap into an arc furnace twice after the cold charge, the unit consumption of electric power is increased by 8.7 kWh/ton cast semifinished product and the heat is lengthened by 3 min. __________ Translated from Metallurg, No. 6, pp. 46–50, June, 2006.     

Russian electrosmelting and predicted demand for metal scrap

The scrap consumption in the electrosmelting of steel in Russia is predicted. Data regarding the introduction of electric arc furnaces in 2013 and the construction of mini mills relying primarily on metal scrap in the period up to 2020 are derived from official Russian sources. The production of electrosteel will continue to expand as a result of the shutdown of open-hearth furnaces and the introduction of new electrosmelting shops in Russia.     

Recycling of scrap for high quality steel products

In an ECSC project several aspects of tramp element control in steel were studied by a group of steel producers and research institutes in the European Union. Upgrading of incinerator scrap and shredded automobile and consumer durable scrap was realised through size and density separation and by pre‐dismantling and sorting of goods before shredding. Removal of tin from tinplate by pre‐treatment with reactive gases was investigated. A dezincing process was developed by dissolution of the zinc‐alloy layer in caustic soda followed by electrochemical deposition of zinc. Results of laboratory scale trials showed that generation of high mass transfer between the phases metalslag‐gas as well as vacuum distillation of the solute elements influencing the evaporation rate can remove copper and zinc from steel melts. A mass balance for the distribution of zinc and lead between metal, slag and dust during scrap melting in an EAF was established. Additional sponge iron charging is a very efficient measure to lower zinc and lead content due to the CO boiling effect during melting.     

废钢价格与废钢比对炼钢经济效益的影响

通过冶炼过程中物料和能量平衡计算获得炼钢的主要物料消耗指标,提出了冶炼工序效益的概念及其计算方法。在此基础上,计算了废钢价格和废钢比的变化对转炉和电炉吨钢成本及工序效益的影响,通过比较分析,得到转炉采取高废钢比冶炼来提高工序效益的废钢价格范围及电炉效益优于转炉效益的废钢价格范围,并给出了转炉合理废钢比及电炉合理铁水比的大致范围。     

喷射旋流浮选机在处理某尾矿中的应用

青海省某矿业公司金矿资源已日趋枯竭,开发利用老尾矿资源已成为该企业可持续发展的途径之一.通过采用喷射旋流浮选机处理尾矿,在原尾矿品位2.20g/t的情况下,获得金精矿品位50g/t、金回收率66%技术指标.     

2005年我国废钢铁市场的运行状况

中国是世界第一钢铁大国,钢铁产业还将持续快速发展.中国也是一个废钢消费大国,同时也是一个废钢进口大国.每年要从世界各国进口大量的废钢,弥补资源的不足.2005年受国际铁矿石市场涨价71.5%的影响,中国废钢铁市场经过潮起潮落之后,日趋平稳.2006年我国废钢铁市场将继续处于资源偏紧,高价位运行的态势.在"十一五"期间,认真落实我国<钢铁产业发展政策>,加快我国废钢铁供需机制的改革,建立新型的废钢加工配送机制,加快调整产业结构,提高废钢加工处理技术水平,实施精料入炉;构建采购联盟,建立海外稳定的废钢资源供应基地;树立循环经济、环境保护的理念,科学健康地发展废钢回收利用产业,是中国废钢铁产业发展的方向和改革的主旋律.