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Study on Extraction of Iron From Chromite
Author(s) -
Zhao Qing,
Liu Chengjun,
Zhang Bo,
Jiang Maofa,
Qi Jie,
Saxén Henrik,
Zevenhoven Ron
Publication year - 2015
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201400521
Subject(s) - chromite , magnetite , chromium , hydrochloric acid , leaching (pedology) , extraction (chemistry) , materials science , metallurgy , porosity , yield (engineering) , particle size , chemistry , nuclear chemistry , chromatography , composite material , environmental science , soil science , soil water
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, Cr 2 O 3 % and specific surface area of chromite, and magnetite was obtained as by‐product.