Upgrading low nickel content laterite ores using selective reduction followed by magnetic separation

Zhu, Deqing; Cui, Yaru; Vining, K.; Hapugoda, Sarath; Douglas, J.; Pan, Jian; Zheng, Guo

doi:10.1016/j.minpro.2012.01.003

Cited by 71 publications

(49 citation statements)

References 13 publications

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“…Zhu dkk. [9] telah melakukan penelitian untuk meningkatkan kadar nikel dengan proses reduksi selektif yang ditambahkan aditif CaSO 4 pada suhu 1100 °C selama 1 jam dan diikuti dengan pemisahan magnetik, peningkatan kadar Ni yang didapatkan mencapai 6,01% dan recovery 92,10%. Bijih nikel yang digunakan adalah bijih nikel campuran, nikel limonit(Ni = 0,97%) dan saprolit (Ni = 1,42%).…”

Section: Pendahuluanunclassified

Proses Reduksi Selektif Bijih Nikel Limonit Menggunakan Zat Aditif CaSO4 [Selective Reduction Process of Nickel Limonite With Adictive CaSO4]

Mayangsari¹,

Prasetyo²

2016

metal.

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IntisariPenelitian ini bertujuan untuk mengetahui kondisi optimum pada proses reduksi selektif bijih nikel limonit menggunakan zat aditif CaSO 4 dan diikuti dengan pemisahan magnetik untuk mendapatkan peningkatan kadar nikel. Proses reduksi selektif dilakukan pada rentang suhu 800 -1100 °C, waktu reduksi 1 -4 jam, serta penambahan reduktor dan aditif 5% -20%. Preparasi bijih nikel limonit dilakukan dengan pemanasan bijih dalam oven, pengecilan ukuran dan pengayakan untuk mendapatkan bijih dengan ukuran lolos 100 mesh. Kemudian dilakukan pencampuran bijih nikel limonit dengan reduktor dan aditif. Campuran bijih nikel limonit kemudian direduksi dalam muffle furnace carbolite pada suhu dan waktu tertentu. Hasil reduksi kemudian ditimbang dan dikonsentrasikan menggunakan proses pemisahan magnetik dan hasilnya dianalisis dengan metode AAS (atomic absorption spectrometry) untuk mengetahui kadar Ni pada konsentrat. Hasil penelitian menunjukkan bahwa semakin tinggi suhu reduksi, peningkatan kadar Ni dan metalisasi logam Ni semakin tinggi, dengan terbentuknya logam Ni yang terpisah dari logam Fe. Hal yang sama juga terjadi jika waktu reduksi semakin lama. Namun, semakin banyak penambahan reduktor pada campuran reduksi, peningkatan kadar Ni semakin kecil. Penambahan CaSO 4 dapat meningkatkan kadar nikel namun belum memberikan kecenderungan hasil yang baik. Peningkatan kadar Ni tertinggi yang didapatkan adalah 2,44%. Direkomendasikan untuk menggunakan suhu reduksi 1100 °C, waktu reduksi 1 jam, penambahan reduktor 10% dan penambahan aditif CaSO 4 20%.

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Section: Pendahuluanunclassified

Proses Reduksi Selektif Bijih Nikel Limonit Menggunakan Zat Aditif CaSO4 [Selective Reduction Process of Nickel Limonite With Adictive CaSO4]

Mayangsari¹,

Prasetyo²

2016

metal.

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“…Calcium oxide is able to facilitate the destruction of silicate networks, improving the reduction of nickel and iron. 21) Besides, the addition of an appropriate amount of CaO facilitates the mass transfer. 22) Previous studies 20,23,24) on the effects of limestone on softening and melting behavior of laterite ores in reductive roasting with anthracite showed that CaO enhances liquid formation and reduces melting temperature.…”

Section: Effect Of Quaternary Basicity On Melting Behavior and Ferronmentioning

confidence: 99%

Effect of Quaternary Basicity on Melting Behavior and Ferronickel Particles Growth of Saprolitic Laterite Ores in Krupp–Renn Process

Peng

Zhang

et al. 2015

ISIJ Int.

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“…5,6) In addition, sulfate, chlorine salt, and calcium oxide have been used as accelerants to promote the reduction of low nickel (< 1.5%) laterite ore, and they all achieved fruitful results. [7][8][9][10][11][12][13] The Yunnan nickel laterite deposit, located in the southwest of China, contains an estimated ore resource of 0.43 Mt of nickel ore. It belongs to a high magnesium (> 30.0 mass% MgO), low iron (< 10.0 mass% total Fe) and low nickel (< 1.0 mass% Ni) laterite ore. Because of the extremely low grade nickel and complex compositions, the processing of this type of nickel silicate minerals is very complex and cost high, so far it has not been reasonable exploited.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sodium Carbonate on Phase Transformation of High-Magnesium Laterite Ore

Zhou

Dong

et al. 2017

Mater. Trans.

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The phase transformation of high-magnesium laterite ore were investigated during the reduction roasting process. In the absence of sodium carbonate [Na 2 CO 3 ], the X-ray diffraction results indicate that the [Fe Ni] alloy existed in ore in the form of taenite. The taenite particles is ne and the size is approximately 30-40 nm, which indicate that the nickel and iron are not migrated and aggregated during the non-smelting reduction roasting process. In the presence of sodium carbonate, the intensity of [Fe Ni] alloy phase increases; the taenite diffraction peaks disappears, corresponding to the appearance of kamacite. The results of SEM images show that the [Fe Ni] alloy particle size has a signi cant increase with the addition of Na 2 CO 3 . Based on the theoretical analysis, the pivotal role of Na 2 CO 3 may be mainly attributed to the Na + , which could in ltrate into the crystal lattice of FeO, leading to the lattice distortion. Furthermore, the sodium carbonate would be decomposed at high temperature, and the generated CO 2 could promote the Boudouard reaction which produced the CO to enhance the reduction of metallic oxides within ore.

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Upgrading low nickel content laterite ores using selective reduction followed by magnetic separation

Cited by 71 publications

References 13 publications

Proses Reduksi Selektif Bijih Nikel Limonit Menggunakan Zat Aditif CaSO4 [Selective Reduction Process of Nickel Limonite With Adictive CaSO4]

Proses Reduksi Selektif Bijih Nikel Limonit Menggunakan Zat Aditif CaSO4 [Selective Reduction Process of Nickel Limonite With Adictive CaSO4]

Effect of Quaternary Basicity on Melting Behavior and Ferronickel Particles Growth of Saprolitic Laterite Ores in Krupp–Renn Process

Effect of Sodium Carbonate on Phase Transformation of High-Magnesium Laterite Ore

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