Distribution of elements between copper and FeO x –CaO–SiO 2 slags during pyroprocessing of WEEE: Part 2

Abstract

Electronic waste (WEEE) is being generated at a rapidly increasing rate and leading to the removal of scarce and valuable metals from the materials cycle. The search for efficient WEEE reprocessing methods requires reliable data on the distribution of these valuable metals during smelting. In this work the distribution ratio of indium between FeO_x–CaO–SiO₂ slags and copper was examined at an oxygen partial pressure of 10⁻⁸ MPa (10⁻⁷ atm) and at 1300°C. The indium distribution ratio was strongly dependant on the CaO content, decreasing as the CaO content increased, but relatively unaffected by the Fe/SiO₂ ratio of the slag over the range examined. Indium was inferred to be present in slag as InO_1·5. The activity coefficient of InO_1·5 was calculated and presented as iso-activity coefficient curves on the copper-saturated FeO_x–CaO–SiO₂ phase diagram. Volatilisation of indium under the oxidising conditions used in this work was insignificant, and it was shown that this is consistent with theoretical expectations. Only in much lower oxygen partial pressure environments can indium volatilisation be expected.

Keywords

WEEE Black copper FCS slag Minor element distributions Indium

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References

Alfantazi,

A. M.

and Moskalyk,

R. R.

. 2003. Processing of indium: a review, Miner. Eng., 16, 687–694.

Anindya,

, Swinbourne,

D. R.

, Reuter,

M. A.

and Matusewicz,

. 2009. Tin distribution during smelting of WEEE with copper scrap, Proc. European Metallurgical Congress 2009, (ed. Harre,

), 555–568, Clausthal-Zellerfeld, GDMB-Informationsges.

Antrekowitsch,

, Potesser,

, Spruzina,

and Prior,

. 2006. Metallurgical recycling of electronic scrap, Proc. EPD Congress 2006, (ed. Howard,

S. M.

.), 899–908, The Minerals, Metals & Materials Society.

Aurubis . 2013. Recycling technology – Aurubis’ multi-metal recycling, http://www.aurubis.com/en/our-business/raw-materials/recycling/technology (accessed on 4 January 2013).

Azakami,

, and Yazawa,

. 1976. Activity measurements of liquid copper binary alloys, Can. Metall. Q., 15, (2), 111–122.

Buchert,

, Manhart,

, Bleher,

and Pingel,

. 2012. Recycling critical raw materials from waste electronic equipment, Öko-Institut e.V. Freiberg, Germany, p. 1.

Cotton,

F. A.

and Wilkinson,

. 1972. Advanced inorganic chemistry, 3rd edn, 270, New York, JohnWiley and Sons.

CRC . 2003. Handbook of chemistry and physics, (ed. Lide,

D. R.

), 84th edn, 12.14–12.15, Boca Raton, FL, CRC Press.

Cui,

and Forssberg,

. 2003. Mechanical recycling of waste electric and electronic equipment: a review, J. Hazard. Mater., 99, (3), 243–263.

10.

Cui,

and Zhang,

. 2008. Metallurgical recovery of metals from electronic waste: a review, J. Hazard. Mater., 158, 228–256.

11.

E-wasteguide.info . 2009. Material composition, http://ewasteguide.info/node/4074 (accessed 14 December 2012).

12.

European Commision . 2012. Recast of the WEEE Directive, http://ec.europa.eu/environment/waste/weee/index_en.htm (accessed on 3 January 2013).

13.

Gilchrist,

J. D.

. 1989. Extraction metallurgy, 3rd edn, 198–201, London, Pergamon Press.

14.

Hagelüken,

. 2005. Recycling of electronic scrap at Umicore's integrated metals smelter and refinery, Proceedings of EMC 2005, Dresden, 307–323, GDMB, Clausthal-Zellerfeld.

15.

Hagelüken,

and Kerckhoven,

T. V.

. 2006. Coping with challenges in WEEE - Recycling by using state-of-art smelting and refining processes, Proc. 5th Int. Electronics Recycling Congress, Hamburg, January 2006.

16.

Hagelüken,

. 2007. The challenges of open cycles – barriers to a closed loop economy demonstrated for consumer electronics and cars. Proc. R’07 World Congress – recovery of materials and energy for resource efficiency (ed. Hilty,

L. M.

.), Davos, Switzerland.

17.

Henao,

H. M.

, Hayes,

P. C.

and Jak,

. 2010. Research on indium and germanium distributions between lead bullion and slag at selected process conditions, Lead zinc 2010, (ed. Siegmund,

.), Vancouver, 1145–1160, Warrendale, PA, TMS.

18.

Juckes,

L. M.

. 2002. Dicalcium silicate in blast-furnace slag: a critical review of the implications for aggregate stability, Min. Proc. Extr. Met., 111, 120–128.

19.

Kang,

, Kehiaian,

H. V.

and Castanet,

. 1977. Étude thermodynamique du système binaire cuivre-indium 2. Étude potentiometrique, J. Less Common Met., 53, 153–166.

20.

Kellogg,

H. H.

. 1991. The non-ideal associated-species model applied to the system copper-indium. Proc. H.H. Kellogg International Symp., (ed. Themelis,

N. J.

and Duby,

P. F.

), 3–15, Warrendale, PA, TMS.

21.

Kongoli,

, McBow,

, Yazawa,

, Takeda,

, Yamaguchi,

, Budd,

and Llubani,

. 2006. Liquidus relationships of calcium ferrite and ferrous calcium silicate slag in continuous copper converting, Proc. Sohn Int. Symp. Advanced Processing of Metals & Materials, (ed. Kongoli,

and Reddy,

R. G.

), 69–87, 2006, Warrendale, PA, TMS.

22.

Lehner,

. 2011. Boliden AB, Ronnskar, Sweden, Personal communication, 13 September 2011.

23.

Matharu,

A. S.

and Wu,

. 2009. Liquid crystal displays, Electronic waste management, (ed. Hester,

R. E.

and Harrison,

R. M.

), 180–211, Cambridge, Royal Society of Chemistry.

24.

Mikolajczak,

. 2009. Availability of indium and gallium, http://www.commodityintelligence.com/images/2010/jan/11%20jan/availability_of_indium_and_galliumwhite_papermikolajczak_sept09.pdf (accessed on 15 February 2013).

25.

Outotec Research Oy . 2009. New simulation tool for process engineers and research scientists, http://www.outotec.com/39468.epibrw (accessed on 9 December 2012).

26.

Outotec Oyj . 2012. The Ausmelt TSL zinc story - recovering value from wastes, http://www.outotec.com/imagevaultfiles/id_925/cf_2/2012_issue1_the_ausmelt_tsl_zinc_story_recovering_.pdf (accessed on 15th February 2013).

27.

Polinares Working Paper 39, 2012. Fact sheet: indium, http://www.polinares.eu/docs/d2-1/polinares_wp2_annex2_factsheet5_v1_10.pdf (accessed on 15 February 2013).

28.

Pauling,

. 1960. The nature of the chemical bond and the structure of molecules and crystals, 98, New York, Cornell University Press.

29.

Sigworth,

G. K.

and Elliott,

J. F.

. 1974. Thermodynamics of dilute liquid copper alloys, Can. Metall. Q., 13, (3), 455–461.

30.

Reuter,

M. A.

, Hudson,

, Van Schaik,

, Heiskanen,

, Meskers,

and Hagelüken,

. 2013. Metal recycling: opportunities, limits, infrastructure, Report of the Working Group on Global Metal Flows to the International Resource Panel, UNEP, http://www.unep.org/resourcepanel/Portals/24102/PDFs/Metal_Recycling-FullReport_36dpi_130710.pdf (accessed on 27 July 2013).

31.

SMG Indium Resources Ltd

2012. Historical indium prices 1992–2012, http://www.smg-indium.com/Docs/IndiumPriceCharts.pdf (accessed on 3 January 2013).

32.

Takeda,

, Ishiwata,

and Yazawa,

. 1983. Distribution equilibria of minor elements between liquid copper and calcium ferrite slag, Trans. Jpn Inst. Met., 24, (7), 518–528.

33.

Takeda,

and Yazawa,

. 1989. Dissolution loss of copper, tin and lead in FeO_n-SiO₂-CaO slag, Productivity and technology in the metallurgical industries, (ed. Koch,

and Taylor,

J. C.

), 227–240, The Minerals, Metals & Materials Society.

34.

US Geological Survey

2012, Mineral commodity summaries, 74–75.

35.

UNEP, International Resource Panel/Reuter, M., Hudson, C., van Schaik, A., Heiskanen, K., Meskers, C. and Hagelüken, C. 2013. Metal recycling: opportunities, limits, infrastructure, Nairobi, UNEP (in press).

36.

Valderraman,

and Jacob,

K. T.

. 1977. Vapor pressure and disspociation energy of In₂O, Thermochimica Acta, 21, 215–224.

37.

Woerz,

and Wallner,

. 1988. Copper recycling plant at brixlegg (Austria), World survey of nonferrous smelters, (ed. Taylor,

J. C.

and Traulsen,

H. R.

), 281–288, The Minerals, Metals & Materials Society.

38.

Wood,

, Creedy,

, Matusewicz,

and Reuter,

M. A.

. 2011. Secondary copper processing using Outotec Ausmelt TSL technology, Proc. MetPlant 2011 [CD ROM], 460–467, Carlton South, The Australasian Institute of Mining & Metallurgy.

39.

Yazawa,

. 1994. Thermodynamic interpretation on oxide dissolution in slag, Pyrometallurgy for complex materials and wastes, (ed. Nilmani,

.) 61–72, Warrendale, The Metallurgical Society.

40.

Yazawa,

, Takeda,

and Nakazawa,

. 1999. Ferrous calcium silicate slag to be used for copper smelting and converting, Copper 99 – Cobre 99 (ed. Diaz,

.), 587–597, Instituto de Ingenieros de Minas de Chile.

Distribution of elements between copper and FeO x –CaO–SiO 2 slags during pyroprocessing of WEEE: Part 2 – indium

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