The sustainability of valuable metals—recycling of residues from stainless steel production

作     者：Kristina BESKOW Andreas RUH Christoffer LUNDSTRM 

作者机构：Uan Hagfors Teknologi AB Djursholmsvgen 30SE-18352 TbySweden Befesa Steel Services GmbH Albert-Hahn-Str.947269 DuisburgGermany 

出 版 物：《Baosteel Technical Research》 (宝钢技术研究（英文版）)

年 卷 期：2010年第4卷第S1期

页      面：136-页

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

主　　题：recycling stainless steel dust Befesa Granshot metal granulation sustainable development 

摘      要：The European stainless steel producers generate 20 -30 kg dust per ton of produced stainless *** dust formed during various stages of the production process contains valuable metals such as Cr,Ni and *** general this dust is considered as a hazardous *** not taken care of the dust will be an environmental risk causing potential problems such as leaching of heavy metals into groundwater and pollution of land and *** applying techniques for recycling the dust the problem is minimized and valuable metals are recovered and re-used as raw material in the steel making process,leading to a significant reduction of the consumption of natural resources to decelerate the climate change and ensure a sustainable *** of the business segments of Befesa Zinc S.L.U.,a subsidiary company of Abengoa,is the recycling of dusts and other residues containing nickel,chromium and molybdenum from the stainless steel *** technologies applied are submerged arc reduction smelting(Befesa Valera S.A.S.,Gravelines,France) and plasma reduction smelting(Befesa ScanDust AB,Landskrona,Sweden).Stainless steel plant dusts,mill scale and other residues are delivered in closed containers and big bags by ship,rail or truck and *** a preparation of the residues and charging into the pyrometallurgical furnace,the metal compounds contained in the charge are reduced to metals in the presence of the carbon *** Befesa ScanDust,the regularly tapped liquid metal is cast in the form of granules via the Granshot^(?) granulation *** granulated product has many advantages such as excellent preheating properties and fast melting when added to a metallurgical *** granules size and shape also makes it very suitable to handle with most raw material handling *** granulating the so-called alloyed pig iron(API) a high metallic yield is achieved ensuring maximum recovery of metal and less new dust generation compared to a crushed *** granules