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SUMMARY:“Steel and the circular economy”  - Katie Daehn\, Engineering 
 Department
DTSTART:20170310T150000Z
DTEND:20170310T153000Z
UID:TALK71538@talks.cam.ac.uk
CONTACT:Karen Mitchell
DESCRIPTION:Steel production accounts for 25% of global industrial emissio
 ns. Steel is the most recycled material\, and there is optimism that a “
 steel circular economy\,” where end-of-life scrap is used for the next g
 eneration of products\, will result in significant emissions reductions. H
 owever\, steel scrap is often contaminated with other elements\, most nota
 bly copper\, which cause metallurgical problems and cannot be removed from
  the melt commercially. Thus\, end-of-life steel is recycled to lower qual
 ity\, tolerant applications – not “circularly.” To understand the co
 nstraints contamination places on steel recycling\, copper was characteriz
 ed in the global steel system. From a survey of literature data and projec
 tions for scrap supply and steel demand by sector\, current and future qua
 ntities of copper entering the system were estimated and compared with the
  quantity of copper that could be tolerated by demanded products. The resu
 lts show that quantities of copper arising from conventional scrap prepara
 tion can be managed in the global steel system until 2040-2050\, but prese
 nt strategies of dilution and down-cycling will become increasingly ineffi
 cient. Technical and policy interventions to support a closed steel loop w
 ill be presented\, including an analysis (in progress) of all the ways cop
 per could be chemically removed from the steel melt and the energy require
 ments of these processes\, thus informing the feasibility and emissions-sa
 ving potential of a “circular economy.”
LOCATION: Cambridge University Engineering Department\, LR6
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