Metall. Res. Technol.
Volume 114, Number 2, 2017
|Number of page(s)||6|
|Published online||27 March 2017|
An environmental friendly Coal-Ca(OH)2-NaOH roasting decomposition strategy for Bayan Obo tailings
School of Metallurgy, Northeastern University,
⁎ e-mail: email@example.com
Received in final form: 10 January 2017
Accepted: 20 January 2017
The decomposition of bastnaesite and monazite has been studied for many years. In this study, a novel Coal-Ca(OH)2-NaOH-roasting strategy for Bayan Obo tailings has been proposed. This paper focused on investigating the roasting process of tailings. The effect of various parameters, such as roasting temperature, roasting time, coal dosage, Ca(OH)2 dosage and NaOH dosage, were investigated. The optimum technological parameters for roasting on tailings were obtained as roasting temperature of 650 °C, roasting time of 60 min, coal dosage of 2%, Ca(OH)2 dosage of 4% and NaOH dosage of 2%. After roasting, the leaching ratio of rare earth oxides and magnetic susceptibility of hematite was 90.14% and 2.37, respectively, and the escaping ratio of fluorine decreased by over 95% compared with that during the roasting without additives.
Key words: Bayan Obo tailings / roasting / decomposition / bastnaesite / monazite
© EDP Sciences, 2017
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