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http://dx.doi.org/10.9727/jmsk.2017.30.3.103

Thermal Decomposition of Arsenopyrite by Microwave Heating and the Effect of Removal Arsenic with Wet-magnetic separation  

On, Hyun-Sung (Dept. of Energy and Resource Engineering, Chosun University)
Kim, Hyun-Soo (Dept. of Energy and Resource Engineering, Chosun University)
Myung, Eun-Ji (Dept. of Energy and Resource Engineering, Chosun University)
Lim, Dae-Hack (Dept. of Energy and Resource Engineering, Chosun University)
Park, Cheon-Young (Dept. of Energy and Resource Engineering, Chosun University)
Publication Information
Journal of the Mineralogical Society of Korea / v.30, no.3, 2017 , pp. 103-112 More about this Journal
Abstract
In order to transform arsenopyrite into pyrrhotite and to decrease As content by less than 2,000 mg/kg, pulp sample and non-magnetic pulp sample were heated in a microwave oven at different heating times and were separated through wet-magnetic separation. As the microwave heating time increased, the phase of pyrrhotite was extended to become arsenopyrite entirely. The melting pores and micro-cracks occurred on the pyrrhotite due to hot spot phenomenon with microwave heating. The heated raw pulp sample (As content : 19,970.13 mg/kg) and non-magnetic pulp sample (As content : 19,970.13 mg/kg) which were heated in a microwave oven for 10 minutes were separated through wet-magnetic separation and magnetic fraction containing less than 2,000 mg/kg of As content was recovered only from the heated sample of magnetic separation. It was discovered that for the sulfide complex ore with As penalty imposed on, if microwave heating and wet-magnetic separation are effectively utilized, magnetic fraction. We expect to be able to obtain ore minerals with an arsenic content below the penalty charge.
Keywords
wet-magnetic separation; microwave heating; arsenopyrite; pyrrhotite; As-remove;
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