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| Low Grade Zinc Ore by Low Temperature Roasting Using (NH4)2SO4 |
| SHEN Xiaoyi, SUN Yi, SONG Jiqiang, ZHAI Yuchun |
| School of materials & Metallurgy, Northeastern University, Shenyang 110004 |
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Cite this article:
SHEN Xiaoyi SUN Yi SONG Jiqiang ZHAI Yuchun. Low Grade Zinc Ore by Low Temperature Roasting Using (NH4)2SO4. Chin J Mater Res, 2012, 26(4): 396-401.
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Abstract The roasting clinker was successfully obtained by low temperature roasting employing low grade zinc ore as row material and ammonium sulfate as reaction medium. The influence of baking temperature in Zn extraction rate was investigated. The results show that the Zn extraction rate reaches to the maximum of 91.8% at 450℃ . The reaction was not sufficient at low temperature, in the contrary, the reaction rate decreased due to the decomposition and volatilization of H2SO4. The ZnSO4 solution was prepared through digestion and filtration processes, and then the pure ZnSO4 solution was gained through purification. The basic zinc carbonate precursor was prepared using homogeneous precipitation employing the ZnSO4 solution as raw materials and the ammonium carbamate as precipitant, and the ultrafine ZnO powder was obtained by calcining the ZnO precursor. XRD, SEM and chemical components analysis were adopted to characterize the as-prepared precursor and the ZnO powder. The results show that the precursor was obtained since the OH− and HCO−3 hydrolyzed from ammonia carbamate reacted with Zn2+ in solution, which was calcinated to prepare the ZnO powder through the dehydration and decomposition. The precursor is basic zinc carbonate of Zn4(CO3)(OH)6·H2O with adhesive spheric particles, and the ZnO powder is of hexagonal wurtzite structure with uniform spheric size and good dispersity.
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Received: 23 April 2012
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| Fund: Supported by National Basic Research Program of China No.2007CB613603 and Fundamental Research Funds for the Central Universities No.110402012. |
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