Effect of purification pretreatment on the recovery of magnetite from waste ferrous sulfate

Wang Yu, Ying-lin Peng, Ya-jie Zheng

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    Cite this article as:

    Wang Yu, Ying-lin Peng, and Ya-jie Zheng, Effect of purification pretreatment on the recovery of magnetite from waste ferrous sulfate, Int. J. Miner. Metall. Mater., 23(2016), No. 8, pp.891-897. https://dx.doi.org/10.1007/s12613-016-1304-2
    Wang Yu, Ying-lin Peng, and Ya-jie Zheng, Effect of purification pretreatment on the recovery of magnetite from waste ferrous sulfate, Int. J. Miner. Metall. Mater., 23(2016), No. 8, pp.891-897. https://dx.doi.org/10.1007/s12613-016-1304-2
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    Effect of purification pretreatment on the recovery of magnetite from waste ferrous sulfate

    • School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    • School of Chemistry and Environmental Engineering, Hunan City University, Yiyang, 413000, China

    基金项目: 

    This research was financially supported by the Special Project on the Integration of Industry, Education and Research of Guangdong Province, China (No. 20013A090100013) and by the High Technology Research and Development Program of Xinjiang Uygur Autonomous Region of China (No. 201407300993).

      通信作者:

      Ya-jie Zheng E-mail: zyj@csu.edu.cn

    中文摘要

    The present study was conducted to elucidate the influence of impurities in waste ferrous sulfate on its recovery of magnetite. Ferrous sulfate solution was purified by the addition of NaOH solution to precipitate impurities, and magnetite was recovered from ferrous sulfate solution without and with purification pretreatment. Calcium hydroxide was added to the solution of ferrous sulfate as a precipitator. A mixed product of magnetite and gypsum was subsequently obtained by air oxidation and heating. Wet-milling was performed prior to magnetic separation to recover magnetite from the mixed products. The results show that with the purification pretreatment, the grade of iron in magnetite concentrate increased from 62.05% to 65.58% and the recovery rate of iron decreased from 85.35% to 80.35%. The purification pretreatment reduced the conglutination between magnetite and gypsum, which favors their subsequent magnetic separation. In summary, a higher-grade magnetite with a better crystallinity and a larger particle size of 2.35 μm was obtained with the purification pretreatment.

     

    Effect of purification pretreatment on the recovery of magnetite from waste ferrous sulfate

    Author Affilications

      • School of Metallurgy and Environment, Central South University, Changsha, 410083, China

      • School of Chemistry and Environmental Engineering, Hunan City University, Yiyang, 413000, China

    • Funds: 

      This research was financially supported by the Special Project on the Integration of Industry, Education and Research of Guangdong Province, China (No. 20013A090100013) and by the High Technology Research and Development Program of Xinjiang Uygur Autonomous Region of China (No. 201407300993).

    • Received: 06 January 2016; Revised: 17 April 2016; Accepted: 20 April 2016;
    The present study was conducted to elucidate the influence of impurities in waste ferrous sulfate on its recovery of magnetite. Ferrous sulfate solution was purified by the addition of NaOH solution to precipitate impurities, and magnetite was recovered from ferrous sulfate solution without and with purification pretreatment. Calcium hydroxide was added to the solution of ferrous sulfate as a precipitator. A mixed product of magnetite and gypsum was subsequently obtained by air oxidation and heating. Wet-milling was performed prior to magnetic separation to recover magnetite from the mixed products. The results show that with the purification pretreatment, the grade of iron in magnetite concentrate increased from 62.05% to 65.58% and the recovery rate of iron decreased from 85.35% to 80.35%. The purification pretreatment reduced the conglutination between magnetite and gypsum, which favors their subsequent magnetic separation. In summary, a higher-grade magnetite with a better crystallinity and a larger particle size of 2.35 μm was obtained with the purification pretreatment.

     

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