microwave and ultrasound augmented leaching of complicated zinc oxide ores in ammonia and ammonium citrate solutions
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2017
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Abstract
Recovery of zinc from low grade zinc oxide ore is attempted with ammonia and ammonium citrate solutions augmented by microwave roasting and ultrasound radiation. The influence of the ammonia-ammonium ratio, roasting temperature, ultrasound power, and leaching time were assessed on the recovery of zinc. A maximum zinc recovery of 88.57% could be achieved at a roasting temperature of 673 K, leaching temperature of 298 K, stirring speed of 300 rpm, total ammonia concentration of 5 mol/L with an ammonium citrate concentration of 1.2 mol/L, liquid to solid ratio of 5:1, the ultrasound power was 600 W and the leaching time was 120 min. The enhancement in recovery with increases in the roasting temperature up to 673 K was attributed to the conversion of ZnCO3 to ZnO. The phases of mineral samples and the reaction residues were characterized by X-ray diffraction (XRD).
| Reference Key |
zhang2017metalsmicrowave
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|---|---|
| Authors | ;Libo Zhang;Haoyu Li;Jinhui Peng;Chandrasekar Srinivasakannan;Shiwei Li;Shaohua Yin |
| Journal | seminars in cancer biology |
| Year | 2017 |
| DOI |
10.3390/met7060216
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| URL | |
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