Ferronickel Slag Performance from Reclamation Area in Pomalaa, Southeast Sulawesi, Indonesia

Abstract

This study aimed to assess the differences of characteristics between the new ferronickel slag generated from the production of nickel and the slag which had been used as a material reclamation. The Toxicity Characteristic Leaching Procedure (TCLP) test was conducted on ferronickel slag to determine the concentration of heavy metals leaching. Then, the tests of X-Ray Diffraction (XRD), Scanning Electron Microscopic (SEM) and Energy-Dispersive X-Ray Spectroscopy (EDX) are also conducted on the ferronickel slag samples. The results of TCLP test show that the new ferronickel slag samples contain Fe (158, 6775 ppm), Cr (0.64465 ppm), and Pb (0.0219 ppm), and that the ferronickel slag has been used as a reclamation material containing Fe (3.94 ppm) and Cr (2.91 ppm). The result of EDX test shows that the slag sample from the reclamation area contains higher Ni concentration than the new slag sample. Slag that has been used for reclamation contains high SiO2 and Mg2(SiO6). The XRD analysis result shows that the highest elements in the slag are Si and Mg with 18.94% and 15.83% respectively. The dominant mineral in the slag is forsterite (Mg 1.784 FeSiO4 0216) by 41% and the rest is magnesium silicate (Mg2(SiO6)).

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Tangahu, B. , Warmadewanthi, I. , Saptarini, D. , Pudjiastuti, L. , Tardan, M. and Luqman, A. (2015) Ferronickel Slag Performance from Reclamation Area in Pomalaa, Southeast Sulawesi, Indonesia. Advances in Chemical Engineering and Science, 5, 408-412. doi: 10.4236/aces.2015.53041.

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1] Svana, E. and Ysteb, R. (1990) Production of FeNi from High Iron Nickel Ores. Engineering Division, Norway.USEPA (2007) Method 1311, Standard for TCLP Method.
[2] Demotica, J.S., Amparado Jr., R.F., Malaluan, R.M. and Demayo, C.G. (2012) Characterization and Leaching Assessment of Ferronickel Slag from a Smelting Plant in Iligan City, Philippines. International Journal of Environmental Science and Development, Vol. 3, No. 5.
[3] Julli, M. (1999) Ecotoxicity and Chemistry of Leachates from Blast Furnace and Basic Oxygen Steel Slag. Australasian Journal of Ecotoxicology, Vol. 5, hal. 123-132. PeraturanPemerintahnomor 18 tahun 1999 tentang Baku MutuHasilUji TCLP.

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