Kinetics of selective removal of iron from chromite by carbochlorination in the presence of sodium chloride

Shen, Shaobo; Hao, Xu-Fan; Yang, Guangwei

doi:10.1016/j.jallcom.2008.09.109

Cited by 12 publications

(2 citation statements)

References 18 publications

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“…The optimum temperature reported was 670 °C, at which 66% of iron could be removed in 1 h and the Cr/Fe ratio of the chromite was raised from 1.9 to 6.0. The author also concluded that sodium chloride promoted the effect of selective removal of iron markedly through a decrease of the apparent activation energy of the carbochlorination reaction. Some routes of carbochlorination to improve the Cr/Fe ratio of chromite have been reported in patents .…”

Section: Introductionmentioning

confidence: 99%

Study on Extraction of Iron From Chromite

Zhao

Liu

Zhang

et al. 2015

steel research int.

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Research about extraction of iron from chemical‐grade South African chromite by carbothermic reduction and hydrochloric acid leaching was conducted in this study. It was found that temperature had a remarkable effect on the extraction yield of iron and that the optimum experimental temperature was 1100 °C, which coincides with the theoretically predicted value. The effect of reduction duration and the process of precipitate development at 1100 °C were also investigated. It was found that selective reduction of iron reached near completion within 2 h with only minor loss of chromium. Results also demonstrated that 20% hydrochloric acid was strong enough to extract iron from the reduction product selectively and at the same time increased the porosity of the chromium‐rich solid particle. Ultimately, there is a clear improvement of the Cr/Fe ratio, Cr2O3% and specific surface area of chromite, and magnetite was obtained as by‐product.

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Section: Introductionmentioning

confidence: 99%

Study on Extraction of Iron From Chromite

Zhao

Liu

Zhang

et al. 2015

steel research int.

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“…Although the addition of sulfur and sulfate can contribute to the recovery of nickel, the S content in the product is high [12]. Chloride is characterized by high reactivity of chlorine and the low melting point of metal chloride, which can selectively separate valuable metals [13,14]. Okamoto et al [15] have shown that with the use of chloride salts as additives to treat nickel laterite, the chlorination reaction occurring during the roasting process can chlorinate and reduce the valuable metals in the ore. Ilic et al [16,17] studied the selective extraction of nickel from raw materials containing iron and nickel by adding calcium chloride.…”

Section: Introductionmentioning

confidence: 99%

Production of Ferronickel Concentrate from Low-Grade Nickel Laterite Ore by Non-Melting Reduction Magnetic Separation Process

Zhou

Wang

et al. 2019

Metals

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The production of ferronickel concentrate from low-grade nickel laterite ore containing 1.31% nickel (Ni) was studied by the non-melting reduction magnetic separation process. The sodium chloride was used as additive and coal as a reductant. The effects of roasting temperature, roasting duration, reductant dosage, additive dosage, and grinding time on the grade and recovery were investigated. The optimal reduction conditions are a roasting temperature of 1250 • C, roasting duration of 80 min, reductant dosage of 10%, additive dosage of 5%, and a grinding time of 12 min. The grades of nickel and iron are improved from 2.13% and 51.12% to 8.15% and 64.28%, and the recovery of nickel is improved from 75.40% to 97.76%. The research results show that the additive in favor of the phase changes from lizardite phase to forsterite phase. The additive promotes agglomeration and separation of nickel and iron.

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