矿热炉直接还原再生利用不锈钢除尘灰试验

不锈钢除尘灰因含有大量重金属离子而对环境产生危害,属危险含铬废物,同时因含有大量镍、铬、铁等元素具有回收价值,对不锈钢除尘灰进行无害化处理及综合利用具有社会效益和经济效益。本文主要介绍了矿热炉再生利用不锈钢除尘灰的相关工艺及工艺的应用情况,为国内不锈钢除尘灰的回收处理提供思路,从而更好的促进我国不锈钢除尘灰回收技术的发展。     

30t电炉冶炼不锈钢除尘红泥球的实践

使用电炉将不锈钢除尘灰熔化还原,实现了不锈钢除尘友内的贵重合金元素Ni、Cr、Mn等的回收使用,也避免了不锈钢除尘灰对环境的二次污染。     

山东阳信不锈钢餐具“领跑”全省产业发展

为加强环境经营建设，促进清洁生产，实现资源利用价值最大化，日前，宝钢不锈钢事业部建立了不锈钢除尘灰综合利用项目。     

不锈钢除尘灰及其综合利用

不锈钢除尘灰因含有大量的重金属离子而对环境产生危害,同时因含有大量镍、铬、铁等元素而具有很大的回收价值.介绍了不锈钢除尘灰的基本特性和无害化处理技术.详细介绍了国外不锈钢除尘灰回收处理的相关工艺及应用情况.通过比较各工艺特点以及在工业中的应用情况,为国内各不锈钢厂不锈钢除尘灰的回收处理提供思路.最后提出不锈钢除尘灰综合利用的方向是解决铬回收率低的问题,同时尽量降低过程能耗,节约回收成本.     

不锈钢除尘灰的再利用研究与实践

为回收利用不锈钢除尘灰中的铬、镍、铁氧化物,山西太钢不锈钢股份有限公司自主开发了一种不锈钢除尘灰的处理应用技术,在除尘灰中配加还原剂和结合剂压制成球,压球在回转窑中经高温烧结,可方便地作为电炉原料使用;除尘灰压球在电炉冶炼不锈钢中使用,配合炉门氧枪吹氧操作,可形成稳定的泡沫渣,炉壁挂渣良好,对电炉炉龄提高有明显效果。     

英国金属集团有限公司

金属集团有限公司（Metals Group Limited）宣布现库存有UNS32304经济型双相不锈钢中厚板，可供销售，立即可发货。现库存有100吨，尺寸为2～50mm×6000×2000mm的钢板，可按照用户的要求在公司的库房里进行等离子切割，激光切割和水力切割。总经理Rob Whitehouse说，金属集团有限公司以销售标准双相不锈钢UNS31803，超级双相不锈钢UNS32750和UNS32760著名，但是，增加经销经济双相型不锈钢是我们发展的合理的步骤。增加一些特殊的双相不锈钢的库存对我们现有的用户有利，也会吸引新的用户。     

氧砂切割不锈钢

氧砂切割不锈钢是我厂铆焊车间职工学习兄弟单位经验,在较短时间内试验成功的一项技术革新。它与等离子切割不锈钢比较,设备简单经济,容易掌握,并且没有什么切割熔渣瘤,特别是可以切割大厚度的不锈钢。氧砂切割不锈钢的原理,我们的初步看法是:由切割氧流送进切口的石英砂,在预热火焰高温加热下,一部分SiO_2熔     

宝钢特殊钢炼钢厂不锈钢除尘灰实现再利用

日前，宝钢特殊钢分公司炼钢厂成功实现不锈钢除尘灰再利用，这是该厂保护社会环境、降低企业成本的又一重要举措。据悉，每回收利用一吨除尘灰可节约3200元。     

不锈钢除尘灰再利用技术

随着不锈钢产能不断扩大,如何消化不锈钢除尘灰已成为不锈钢生产企业必须面对的一大问题,山西太钢不锈钢股份有限公司炼钢二厂于2007年2月在30 t超高功率电炉上自主开发了用不锈钢除尘灰冶炼铬镍铁合金技术,并推广应用到工业化生产中。5年的运行实践表明,该技术在保护环境、解决镍资源和降低生产成本方面发挥了巨大作用,值得同类企业借鉴。     

钢板的激光切割

钢板的激光切割英国的研究表明，用激光切割钢板时，工艺参数的选取对切割质量影响很大。在给定功率不变的情况下，切割３ｍｍ厚的碳钢与不锈钢钢板时，前者的最大切割速度要比后者的高６０％。当增大辅助气体压力，并使其超过临界值时，切割碳钢钢板的切边质量变差；而切...     

在5 MVA矿热炉中以300系列不锈钢除尘灰球为原料生产低镍铬生铁工业试验

为开发利用不锈钢除尘灰,回收铬、镍等贵重金属元素,对矿热炉生产低镍铬生铁进行了工业生产试验。结果表明,矿热炉冶炼300系列不锈钢除尘灰球,不但解决了对环境的影响,而且还能够通过回收利用生产出符合不锈钢标准的低镍铬生铁,具有一定的社会和经济效益,进行工业生产是可行的。     

AOD设备及工艺设计特点

简要分析了AOD的工作原理、工艺操作过程;并结合AOD工艺操作特点,总结了AOD炉体设备、供配气系统、铁合金及副原料加料系统、烟气净化系统等相关设施的设备设计特点以及工艺设计特点。     

钢包炉上料除尘设备的设计

对炼钢项目中钢包炉、车间内外上料除尘系统设备设计改型从工艺、技术、投资、施工进度等方面进行了比较和论述,对设计改型后的系统进行了评价,为今后新建钢厂和旧钢厂环保除尘设备的改造提供了借鉴。     

世界不锈钢工艺技术和市场的现状和发展

世界上大部分不锈钢是由二次冶金工艺－ＡＯＤ或ＶＯＤ生产的。为了在生产不锈钢时减少氩气消耗和对耐火材料的需求，以及降低硅铁的用量，发展了ＥＡＦ／ＬＤ（ＭＲＰ）／ＶＯＤ三步炼钢法。在２～３ｍｍ厚的不锈钢板的市场上，廉价的不锈钢热轧板开始与冷轧板竞争。在今后１０年中，世界不锈钢的需求可望以每年５％～６％的速度增加。     

Latest developments for dry and wet dedusting systems for converter steel making

Environmental requirements world wide and in the P.R.of China in particular have increased and authorities are increasing the pressure on steelmakers to comply with always more stringent limits and standards. Modern converter steel making goes along with the innovation and new developments not only for the primary converter process itself but even more for the dedusting technologies.This paper describes the benefits and latest development of advanced off gas cleaning and recovery systems based on dry type cleaning with electrostatic precipitation and wet type gas cleaning based on wet scrubbers.Modern converter dedusting is based on suppressed combustion systems in order to reduce off gas amounts and to be able to use the gas for gas recovery.The dry type primary off gas treatment system based on electrostatic precipitator technology is the most advanced environmental solution available for converter steel making.Dry dedusting has been introduced in China successfully with a significant contribution by Siemens VAI being the market leader for converter dry dedusting systems.Siemens VAI has introduced several design improvements over the last years such as CFD modeling of flow conditions in evaporation cooler,design of chains for dust conveyors,design of ESP inlet,design and thickness of discharge electrodes and operation in energy saving mode.Additionally the DDS process has been successfully implemented in China for the De-P process.The gas recovery system for DDS has been optimized over the years with high quality equipment and integrated automation and control systems.Wet type dedusting for converter gas is a well proven technology for many years and is still widely used due to the simplicity of the process and the lower investment costs.SVAI has continuously improved it’s wet dedusting technologies to provide highly energy efficient systems which can achieve lowest levels of clean gas dust while still maintaining a moderate water and energy consumption with simplified process control and standardized process control packages.Main design and process improvements include expansion joints for connection of scrubber to cooling stack,new type of droplet separator,advanced hood pressure control package,ID fan washing system,ID fan speed control system etc.The focus for wet type gas recovery systems is still on maximum safety and reliability.SVAI has also successfully improved the technological packages for converter gas recovery for wet type dedusting systems.The comparison between the two system shows the advantages of dry dedusting mainly being the lowest clean gas dust content, lower operating costs,easier handling for recycling of residuals and no need for a water treatment plants.Wet type dedusting has it’s main advantages in the simple process and operation of the system,the flexible layout solutions inside the steel shop as well as generally lower investment costs.An overview on the numerous reference installations for dry- and wet type dedusting systems in China as well as world wide is given.     

Establishment of Optimal Blade Clearance of Stainless Steel Rolling-Cut Shear and Test of Shearing Force Parameters

 The purpose aims to improve the plate shearing section quality and metal yield by means of optimal blade clearance adjustment model of rolling-cut shear and accurate calculation of the maximum shearing force, as well as for the system optimization design, structure optimization design to provide important basis. A 3500 mm rolling shear of a large stainless steel factory was taken as the test object, and the blade clearance under different influence factors of the clearance value and the shearing section were tested. The optimized production accumulated data regression analysis and the rolling shear process of stainless steel shear test. The test results show that the optimal blade clearance adjustment module is a comprehensive function, which include steel plate thickness, material, temperature and shear plate volume. The shear stress at starting stage with the relative penetration depth increases affected by the above factors, and the fracture peak decreases rapidly after being cut into the roll phase constant.     

全数字交流变频调速装置在不锈钢横切线上的应用

介绍全数字交流变频调速装置在不锈钢横切生产线上的应用,说明其基本配置、功能和控制特点。由于采用网络通信技术,简化了设计、安装和调试过程,提高了电气设备的控制性能及可靠性,保证了产品的产量和质量。     

高压变频调速技术在转炉除尘风机上的研究与应用

莱钢炼钢厂将高压变频调速技术应用于1^#转炉除尘风机,经合理设计方案,实现了除尘风机随转炉冶炼周期自动合理调速,减少了设备故障。该系统安全可靠,操作简单,节电率达60%,年节电效益达83.16万元。     

关于气力输送设计问题的探讨

分析了钢铁厂除尘灰输送的几种方式及特点,简要地介绍了气力输送装置的设计与计算方法,利用该方法可以确定某些工艺参数,为设计提供依据。