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Open AccessArticle

Extraction of Cobalt and Iron from Refractory Co-Bearing Sulfur Concentrate

by Xiao Junhui 1,2,3,4,* and Zhang Yushu 2,4
1
Sichuan Engineering Lab of Non-metallic Mineral Powder Modification and High-value Utilization, Southwest University of Science and Technology, Mianyang 621010, China
2
Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences, Chengdu 610041, China
3
Key Laboratory of Sichuan Province for Comprehensive Utilization of Vanadium and Titanium Resources, Panzhihua University, Panzhihua 61700, China
4
Key Laboratory of Ministry of Education for Solid Waste Treatment and Resource Recycle, Southwest University of Science and Technology, Mianyang 621010, China
*
Author to whom correspondence should be addressed.
Processes 2020, 8(2), 200; https://doi.org/10.3390/pr8020200
Received: 7 January 2020 / Revised: 4 February 2020 / Accepted: 4 February 2020 / Published: 6 February 2020
(This article belongs to the Special Issue Green Separation and Extraction Processes)
In this study, oxidizing roasting, segregation roasting, and magnetic separation are used to extract cobalt and iron from refractory Co-bearing sulfur concentrate. The Co-bearing sulfur concentrate containing 0.68% Co, 33.26% Fe, and 36.58% S was obtained from V-Ti magnetite in the Panxi area of China by flotation. Cobalt pyrite and linneite were the Co-bearing minerals, and the gangue minerals were mica, chlorite, feldspar, and calcite in Co-bearing sulfur concentrate. The results show that cobalt is transformed from Co-pyrite and linneite to a Co2FeO4-dominated new cobalt mineral phase, and iron is transformed from pyrite to Fe2O3 and an Fe3O4-dominated new iron mineral phase after oxidizing roasting. Cobalt changed from CoFe2O4 to a new cobalt mineral phase dominated by [Co] Fe solid solution, and iron changed from Fe2O3 to a new iron mineral phase dominated by metal Fe and Fe3O4 after segregation roasting. Cobalt concentrate with a cobalt grade of 15.15%, iron content of 71.22%, and cobalt recovery of 90.81% as well as iron concentrate with iron grade of 60.06%, cobalt content of 0.11%, and iron recovery of 76.23% are obtained. The main minerals in the cobalt concentrate are Fe, [Co]Fe, Fe3O4, and SiO2, and the main minerals in the iron concentrate are Fe3O4, FeO, Ca2Si2O4, and Ca2Al2O4.
Keywords: cobalt; iron; Co-bearing sulfur concentrate; roasting; magnetic separation cobalt; iron; Co-bearing sulfur concentrate; roasting; magnetic separation
MDPI and ACS Style

Junhui, X.; Yushu, Z. Extraction of Cobalt and Iron from Refractory Co-Bearing Sulfur Concentrate. Processes 2020, 8, 200.

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