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http://dx.doi.org/10.9727/jmsk.2018.31.3.137

Characteristics of Microwave Leaching for the Removal of Bi, As from the Sulfide Mineral Concentrate  

On, Hyun-Sung (Department of Energy and Resource Engineering, Chosun University)
Togtokhmaa, B. (Department of Energy and Resource Engineering, Chosun University)
Park, Cheon-Young (Department of Energy and Resource Engineering, Chosun University)
Publication Information
Journal of the Mineralogical Society of Korea / v.31, no.3, 2018 , pp. 137-147 More about this Journal
Abstract
The aim of this study was to leach penalty elements, such as Bi and As, effectively through microwave leaching of a gold concentrate sample containing penalty elements with nitric acid solution. For this purpose, the time effect of microwave leaching, nitric acid concentration effect, and sample addition effect in a microwave were examined. The experiment, demonstrated that the leaching rate of penalty elements increased as microwave leaching time and nitric acid concentration increased and concentration addition decreased. When a microwave heating experiment was carried out on the concentrate and ore minerals, Bi was removed by as much as 90%, and the phase of arsenopyrite was transformed in the order of arsenopyrite (FeAsS), pyrrhotite (FeS), and hematite ($Fe_2O_3$). When the X-ray diffraction (XRD) analysis was carried out with solid residue, elemental sulfur and anglesite were identified. The intensity of the XRD peaks of elemental sulfur and anglesite increased, and the peaks were sharper when the microwave leaching time was 12 min instead of 1 min, the nitric acid concentration was 4 M in rather than 0.5 M, and the concentration addition was 30 g rather than 5 g. This was probably because more elemental sulfur and anglesite were generated in the leaching solution as the leaching efficiency increased. Bi can be leached as valuable elements in the leaching solution through microwave leaching processes while they are released to the environment through a microwave heating processes.
Keywords
Microwave heating; penalty element; bismuth; arsenic microwave leaching;
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