Utilization of Gypsum Byproduct as Fuming Agent for Tin Smelting Slag
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Pyrite is very commonly used as a source of sulfur for converting tin oxide from tin smelting slag or low-grade tin ore/concentrate into tin sulfide by means of a tin fuming process to increase the overall tin recovery in a tin smelting plant. The conversion of tin sulfide into tin oxide as final product of a tin fuming process produces sulfur dioxide, which is captured by spraying of calcium hydroxide, producing gypsum as the byproduct. To reduce the footprint of pyrite mining activity and to reduce the environmental impact, the recycling of sulfur from gypsum byproduct as a fuming agent to substitute pyrite was studied in this research. The FactSage™ thermodynamic software was applied to simulate the performance of tin fuming by addition of gypsum. The experiments were conducted in a muffle furnace for 1 h at 1100, 1200, and 1300 °C. The experimental results showed that a gypsum addition of 20% into tin smelting slag containing 10.44% Sn (S/Sn ratio = 1.3) yields a tin volatilization of 81.2% at 1200 °C. The addition of more gypsum lowers the degree of tin volatilization.
KeywordsTin volatilization Tin smelting slag Gypsum FactSage
The authors would like to thank ITB for funding this research through the P3MI program.
- 1.https://friendsoftheearth.uk/sites/default/files/downloads/tin_mining.pdf. Accessed 18 July 2017
- 2.https://minerals.usgs.gov/minerals/pubs/commodity/tin/. Accessed 3 May 2017
- 4.http://hist-met.org/images/pdf/HMSdatasheet203.pdf. Tin: smelting and production of alloys. Accessed 11 Dec 2017
- 5.Smith R (1996) An analysis of the processes for smelting tin. Bull Peak Dist Mines Hist Soc 13:91–99Google Scholar
- 7.Baldock R, Glinin A (2014) Estano, xi and tin 43 years (and counting) of TSL melting. In: High Temperature Processing Symposium, Swinburne, Australia, pp. 61–63Google Scholar
- 8.Stoltz EC (1976) An electric tin smelter for the processing of low-grade tin concentrates in South Africa. J South Afr Inst Mining Metal 77:91–92Google Scholar
- 11.Valayapetre M, Chutinara D, Chaowakit T (1988) Fuming process of Batu Besi complex tin ores. In: International Symposium on Research and Development in Extractive Metallurgy of Tin and Related Metals, Ipoh, Malaysia, pp. 193–203Google Scholar