Chemical and mineralogical evaluation of slag products derived from the pyrolysis/melting treatment of MSW

Saffarzadeh, Amirhomayoun; Motomura, Yuki; Watanabe, Kenji

doi:10.1016/j.wasman.2005.12.005

Cited by 43 publications

(25 citation statements)

References 14 publications

(17 reference statements)

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“…The pyrolysis melting technology is an innovative pyrolysis gasification and melting process for the proper treatment of municipal waste. In this type of MSW melting treatment that operate under semi-oxidizing to oxidizing atmosphere, MSW-derived substances (pyrolysis char and gas) produced at a pyrolysis drum (reactor) is introduced into a high temperature combustion chamber (HTCC) and co-fired at a controlled temperature rate (∼1300 • C) to generate molten slag material (see [9][10][11] for further technical details). Slag and remaining metallic compounds are simultaneously tapped from the tapping hole of HTCC.…”

Section: Description Of the Melting Processesmentioning

confidence: 99%

“…During the observations, it was learnt that the slag residues are enriched in a number of heavy elements of environmental concern, including Zn, Cr, Cu, Pb and Ni as chief components [9]. Therefore, through the ongoing discussion, particular attention has been given to: (i) the preliminary identification of the heavy metal-bearing phases by using optical microscopy; (ii) the distribution pattern and morphology of those phases; and (iii) their chemical compositions.…”

Section: Introductionmentioning

confidence: 99%

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Characterization study of heavy metal-bearing phases in MSW slag

Saffarzadeh¹,

Shimaoka²,

Motomura³

et al. 2009

Journal of Hazardous Materials

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Section: Description Of the Melting Processesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization study of heavy metal-bearing phases in MSW slag

Saffarzadeh¹,

Shimaoka²,

Motomura³

et al. 2009

Journal of Hazardous Materials

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“…This topography probably caused by two processes: (a) carbonate and sulfate decomposing at high temperature; (b) thermal expansion and contraction during rapid quenching. Saffarzadeh et al [13] and Liu and Liu [10] considered that heavy metals were incorporated into the existing spinel phases, melilite and interstitial silicate clinker, which prevent heavy metals leaching into the environment. They concluded that melting is a safe and effective means to reduce heavy metals emission from MSW thermal treatments.…”

Section: Experimental Setups and Methodsmentioning

confidence: 99%

“…The other treatment runs at high temperature (1200°C-2000°C) to make sure volatile organic compounds (VOCs, e.g. dioxins) are decomposed fully and heavy metals are trapped in melted slag effectively [13,14].…”

Section: Introductionmentioning

confidence: 99%

A steam dried municipal solid waste gasification and melting process

Xiao

Jin

et al. 2011

Front. Environ. Sci. Eng. China

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Considering high-moisture municipal solid waste (MSW) of China, a steam dried MSW gasification and melting process was proposed, the feasibility was tested, and the mass and energy balance was analyzed. Preliminary experiments were conducted using a fixed-bed drying apparatus, a 200 kg per day fluidized-bed gasifier, and a swirl melting furnace. Moisture percentage was reduced from 50% to 20% roughly when MSW was dried by slightly superheated steam of 150°C-350°C within 40 min. When the temperature was less than 250°C, no incondensable gas was produced during the drying process. The gasifier ran at 550°C-700°Cwith an air equivalence ratio (ER) of 0.2-0.4. The temperature of the swirl melting furnace reached about 1240°C when the gasification ER was 0.3 and the total ER was 1.1. At these conditions, the fly ash concentration in the flue gas was 1.7 g$(Nm 3 ) -1 , which meant over 95% fly ash was trapped in the furnace and discharged as slag. 85% of Ni and Cr were bound in the slag, as well as 60% of Cu. The mass and energy balance analysis indicates that the boiler heat efficiency of an industrial MSW incineration plant reaches 86.97% when MSW is dried by steam of 200°C. The boiler heat efficiency is sensitive to three important parameters, including the temperature of preheated MSW, the moisture percentage of dried MSW and the fly ash percentage in the total ash.

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“…The py rol y sis/melt ing treat ment of solid waste can also pro duce slags (Traber et al, 2002;Saffarzadeh et al, 2006). 4.…”

Section: Introductionmentioning

confidence: 99%

Mineralogy of the ceramic slags from the Bronze Age funerary site at Lăpuş (NW Romania)

Hoeck

Ionescu

Metzner-Nebelsick

et al. 2012

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A Bronze Age (13-12th cen tury B.C.) ne crop o lis and cult area in Lăpuş (NW Ro ma nia) has been stud ied. The mound in ves ti gated dur ing the pres ent cam paign cov ered a multi-phased wooden cult build ing con tain ing bronze ob jects, ce ramic potshards and slag pieces. The lat ter have a mammillary smooth sur face, ir reg u lar shape and a high po ros ity. Op ti cal mi cros copy re veals a colour less to brown vit re ous mass, full with var i ous-sized pores mak ing up to 40 vol.% of the to tal slag. The glass in cludes relic phases, e.g., quartz, partly melted plagioclase and rutile, rare zir con, il men ite and mag ne tite-rich spinel. Cristobalite and var i ous sil i cates and ox ides were formed within the glass and at the wall of the ves i cles dur ing cool ing. The lat ter in clude faya lite, ferrosilite, mag ne tite-dom i nated spinel, he ma tite, clinopyroxene, mullite and cor di er ite. About 1/3 of the to tal vol ume of the slag con sists of glass with a wide va ri ety of SiO 2 rang ing from 49 to 76 wt.%. It is inhomogeneous, with lo cal en rich ment in Fe, Ca, Mg, Ti and K. The pore struc ture, the par tial melt ing of plagioclase and rutile, the newly formed SiO 2 poly morphs (cristobalite) and the Fe(Al) sil i cates in di cate max i mum tem per a tures of 1100-1200°C for the fire gen er at ing the slags. The slags are not re lated to any met al lur gi cal but to an anthropogenic pyrometamorphic pro cess and formed as a re sult of overfiring some ce ramic ves sels which may have con tained rit ual of fer ings. In ten tion ally ini ti ated fir ing of the wooden struc tures is the most likely the agent of this high tem per a ture. The slags re sem ble buchites and can be termed "ce ramic slags".

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Chemical and mineralogical evaluation of slag products derived from the pyrolysis/melting treatment of MSW

Cited by 43 publications

References 14 publications

Characterization study of heavy metal-bearing phases in MSW slag

Characterization study of heavy metal-bearing phases in MSW slag

A steam dried municipal solid waste gasification and melting process

Mineralogy of the ceramic slags from the Bronze Age funerary site at Lăpuş (NW Romania)

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