EVALUASI PENAMBAHAN BAHAN IMBUH SILIKA PADA PROSES CONVERTER NIKEL MENGGUNAKAN FACTSAGE DI PT VALE INDONESIA
DOI:
https://doi.org/10.31961/intekna.v25i1.14890Kata Kunci:
fluks, silika, nikel matte, fayalitAbstrak
Proses pemurnian nikel matte di unit converter PT. Vale Indonesia melibatkan penambahan bahan imbuh silika (SiO2) untuk mengikat FeO membentuk terak stabil berupa fayalite. Penelitian ini bertujuan untuk mengevaluasi efisiensi penambahan fluks silika terhadap performa proses konversi menggunakan simulasi termodinamika Factsage dan log operasional lapangan. Metode yang digunakan meliputi karakterisasi kimia menggunakan XRF pada berbagai material input dan slag hasil konversi. Simulasi kesetimbangan fasa pada 1200oC menggunakan modul Equilib dari Factsage, serta perhitungan rasio massa slag terhadap logam hilang. Hasil menunjukkan bahwa penambahan silika menurunkan kadar Fe dan S dalam matte secara signifikan, sekaligus meningkatkan kadar Ni hingga 78%. Namun, deviasi penambahan fluks yang terlalu tinggi, khususnya pada blow ke-10 menyebabkan akumulasi SiO2 bebas dalam slag dan berpotensi meningkatkan viskositas serta menurunkan efisiensi pemisahan. Evaluasi terhadap diagram terner dan perbandingan rasio massa menunjukkan pentingnya kontrol rasio Fe/SiO2 agar posisi komposisi slag tetap berada dalam zona slag cair dan fasa fayalit.
Unduhan
Referensi
[1] X. Zhou et al., “Risk Transmission of Trade Price Fluctuations from a Nickel Chain Perspective: Based on Systematic Risk Entropy and Granger Causality Networks,” Entropy, vol. 24, no. 9, 2022, doi: 10.3390/e24091221.
[2] D. Sukhomlinov, O. Virtanen, P. Latostenmaa, A. Jokilaakso, and P. Taskinen, “Impact of MgO and K2O on Slag-Nickel Matte Equilibria,” J. Phase Equilibria Diffus., vol. 40, no. 6, pp. 768–778, 2019, doi: 10.1007/s11669-019-00767-3.
[3] L. ming Ma et al., “Phase transition mechanism of high-silica fluxed pellets during consolidation,” Ironmak. Steelmak., vol. 50, no. 6, pp. 637–647, 2023, doi: 10.1080/03019233.2022.2144400.
[4] M. Chen and B. Zhao, “Viscosity Measurements of SiO2-‘FeO’-CaO System in Equilibrium with Metallic Fe,” Metall. Mater. Trans. B Process Metall. Mater. Process. Sci., vol. 46, no. 2, pp. 577–584, 2014, doi: 10.1007/s11663-014-0241-6.
[5] M. Chen, S. Raghunath, and B. Zhao, “Viscosity of SiO2-"FeO"-Al2O3 system in equilibrium with metallic Fe,” Metall. Mater. Trans. B Process Metall. Mater. Process. Sci., vol. 44, no. 4, pp. 820–827, 2013, doi: 10.1007/s11663-013-9831-y.
[6] H.-R. Lee, H. Shin, S.-C. Shim, and Y. Kang, “Viscosity measurement of FeO-SiO2 based slags under controlled oxygen partial pressures,” pp. 91–99, 2024, doi: 10.62053/lyvj9833.
[7] Y. Wang, R. Zhu, Q. Chen, G. Wei, S. Hu, and Y. Guo, “Recovery of Fe, Ni, Co, and Cu from nickel converter slag through oxidation and reduction,” ISIJ Int., vol. 58, no. 12, pp. 2191–2199, 2018, doi: 10.2355/isijinternational.ISIJINT-2018-533.
[8] Z. Huang, Z. Xing, G. Cheng, J. Liu, X. Xue, and X. Ding, “Preparation and Consolidation Mechanism of Nickel Laterite Carbon Composite Hot Briquette,” J. Phys. Conf. Ser., vol. 2300, no. 1, 2022, doi: 10.1088/1742-6596/2300/1/012008.
[9] R. F. da Silveira, O. J. C. Fernandez, P. T. S. da Luz, and J. H. B. da Costa, “Thermal transformations of the nickel laterite agglomerate phases and their metallurgical influence,” Mater. Sci. Forum, vol. 1012 MSF, pp. 337–342, 2020, doi: 10.4028/www.scientific.net/MSF.1012.337.
[10] P. Ju, K. Ryom, and K. Hong, “Separation of iron-nickel alloy nugget from limonitic laterite ore using self-reduction,” J. Min. Metall. Sect. B Metall., vol. 54, no. 3, pp. 385–392, 2018, doi: 10.2298/JMMB180709028J.
[11] D. Zhao, B. Ma, B. Shi, Z. Zhou, P. Xing, and C. Wang, “Mineralogical Characterization of Limonitic Laterite from Africa and Its Proposed Processing Route,” J. Sustain. Metall., vol. 6, no. 3, pp. 491–503, 2020, doi: 10.1007/s40831-020-00290-7.
[12] Z. Huang, Z. Xing, J. Liu, G. Cheng, X. Ding, and X. Xue, “The Influence of Basicity on the Softening and Melting Behaviors of Limonitic Laterite Ore Sinter,” Steel Res. Int., 2024, doi: 10.1002/srin.202400262.
[13] X. Wang et al., “Efficient Utilization of Limonite Nickel Laterite to Prepare Ferronickel by the Selective Reduction Smelting Process,” Sustain., vol. 15, no. 9, 2023, doi: 10.3390/su15097147.
[14] A. M. Amdur, S. A. Fedorov, and V. V. Yurak, “Transfer of gold, platinum and non-ferrous metals from matte to slag by flotation,” Metals (Basel)., vol. 11, no. 10, 2021, doi: 10.3390/met11101602.
[15] K. Laungsakulthai, T. Chandakhiaw, N. Wongnaree, J. Thampiriyanon, W. Kritsarikun, and S. Khumkoa, “Smelting reduction of spent catalyst containing nickel: A preliminary study,” Mater. Sci. Forum, vol. 1009 MSF, pp. 162–167, 2020, doi: 10.4028/www.scientific.net/MSF.1009.162.
[16] B. Widyartha, Y. Setiyorini, F. Abdul, T. J. Subakti, and S. Pintowantoro, “Effective beneficiation of low content nickel ferrous laterite using fluxing agent through Na2SO4 selective reduction,” Materwiss. Werksttech., vol. 51, no. 6, pp. 750–757, 2020, doi: 10.1002/mawe.202000007.
[17] M. S. Moats and W. G. Davenport, “Nickel and Cobalt,” Treatise Process Metall., pp. 575–604, 2024, doi: 10.1016/b978-0-323-85373-6.00030-2.
[18] M. Hasegawa, “Ellingham Diagram,” Treatise Process Metall. Vol. 1 Process Fundam., pp. 349–355, 2014, doi: 10.1016/B978-0-323-85935-6.00034-9.
[19] J. M. Romero et al., “Improving the rotary kiln-electric furnace process for ferronickel production: Data analytics-based assessment of dust insufflation into the rotary kiln flame,” Alexandria Eng. J., vol. 61, no. 4, pp. 3215–3228, 2022, doi: 10.1016/j.aej.2021.08.036.
[20] F. Crundwell, M. Moats, V. Ramachandran, T. Robinson, and W. G. Davenport, “Extractive Metallurgy of Nickel, Cobalt and Platinum Group Metals,” Extr. Metall. Nickel, Cobalt Platin. Gr. Met., 2011, doi: 10.1016/C2009-0-63541-8.
[21] Y. X. Liu, Y. G. Wei, S. W. Zhou, B. Li, and H. Wang, “Matte-Slag Separation Behavior As a Function of Iron Phase Reduction in Copper Slag,” J. Min. Metall. Sect. B Metall., vol. 59, no. 1, pp. 27–37, 2023, doi: 10.2298/JMMB220421003L.
[22] W. Xuan, H. Wang, and D. Xia, “Deep structure analysis on coal slags with increasing silicon content and correlation with melt viscosity,” Fuel, vol. 242, pp. 362–367, 2019, doi: 10.1016/j.fuel.2019.01.049.
