Recovery of Scrap Metals from MSWI Bottom Ash Using Physical Separation Methods
Handling of municipal solid waste (MSW) and control of its potential resources is becoming increasingly important in modem society.The OECD (Organization for Economic Co-operation and Development) average on municipal waste produced in 2003 was that of around 570 kg per inhabitant.In European Union countries around half amount is of MSW landfilled.In Finland still 88% of MSW was landfilled in 2004.Since incineration reduces MSW volume significantly while producing heat energy,it has become one of the most common waste handling techniques.The shortcoming of incineration is however,that incinerated MSW is often not pre-sorted and it produces slags and ashes as side streams from which recovery of metals is difficult.This paper looks into possibilities of scrap metal recovery for recycling from municipal solid waste incineration (MSWI) bottom ash.In order to do that,a flow sheet of physical separation methods was developed and tested with Finnish rotary furnace MSWI bottom ash.In addition,an empirical model for estimation of the recoveries of scrap metals with physical separation methods for treatment of MSWI bottom ash was developed.According to the results of this study,for 1 Mt of incinerated MSW with 30% mass reduction,a minimum resource potential of 100 kt for magnetic metal scrap of roughly 24 % grade and about 19 kt of non-magnetic metal scrap of roughly 65 % grade.In other words,57 kg magnetic scrap and 12 kg non-magnetic scrap per inhabitant at the mentioned grades,respectively.Although wide variations of parameters affect the MSWl bottom ash quality,it can be said that a considerable amount of metals is drained into MSWI bottom ash.Results of this study show that from MSWI bottom ash significant material streams metal scrap can be reintroduced into the resource cycle which would otherwise be lost.
MSWI Bottom ash Recycling Physical separation Scrap metal recovery
M.Kinnunen M.Oja K.Heiskanen
Laboratory of Mechanical Process Technology and Recycling,Helsinki University of Technology,Espoo,Finland
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
3565-3574
2008-09-24(万方平台首次上网日期,不代表论文的发表时间)