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首页> 外文期刊>Journal of Hazardous Materials >Selective recovery of chromium from ferronickel slag via alkaline roasting followed by water leaching
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Selective recovery of chromium from ferronickel slag via alkaline roasting followed by water leaching

机译：通过碱焙烧然后水浸从镍铁渣中选择性回收铬

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摘要

Chromium was selectively recovered from ferronickel slag by roasting the slag with addition of Na2O2, followed by water leaching. The thermodynamic analysis revealed that in the presence of Na2O2 at appropriate temperatures, the Cr2O3 in the ferronickel slag can be converted to NaCrO2, instead of Na2CrO4, which prevents the formation of highly toxic Cr (VI). The experimental results confirmed that under the optimal alkaline roasting and water leaching conditions of the mass ratio of ferronickel slag to Na2O2 of 1, roasting temperature of 600 degrees C, roasting time of 1 h, leaching temperature of 50 degrees C, leaching time of 1 h, and liquid-to-solid ratio of 10 mL/g, 92.33% of Cr was leached with 64.28% of Na and 11.16% of Si and only 0.06 wt % Cr was left in the leaching residue. The high leaching percentage of Cr was a result of the transformation of Cr2O3 in the ferronickel slag to NaCrO2 with a loose structure during alkaline roasting that was beneficial to water dissolution. Compared to the traditional alkaline roasting process, the proposed more environmentally friendly method did not produce toxic Cr (VI) during recovery of chromium and the resulting residue has potential to be used as a good construction material.
机译：通过添加Na2O2焙烧炉渣，然后水浸出，从镍铁炉渣中选择性地回收铬。热力学分析表明，在适当温度下存在Na2O2的情况下，镍铁矿渣中的Cr2O3可以转化为NaCrO2而不是Na2CrO4，从而阻止了高毒性Cr（VI）的形成。实验结果证实，在最佳碱性焙烧和水浸条件下，镍铁矿渣与Na2O2的质量比为1，焙烧温度为600℃，焙烧时间为1h，浸出温度为50℃，浸出时间为1 h，液固比为10 mL / g，浸出92.33％的Cr和64.28％的Na和11.16％的Si，在浸出残渣中仅剩下0.06 wt％的Cr。 Cr的高浸出率是由于在碱性焙烧过程中镍铁渣中Cr2O3转变为具有疏松结构的NaCrO2的结果。与传统的碱性焙烧工艺相比，所提出的更环保的方法在铬的回收过程中不会产生有毒的Cr（VI），并且所产生的残留物有可能被用作良好的建筑材料。

著录项

  • 来源
    《Journal of Hazardous Materials》 |2019年第15期|83-91|共9页
  • 作者

    Gu Foquan; Zhang Yuanbo; Peng Zhiwei; Su Zijian; Tang Huimin; Tian Weiguang; Liang Guoshen; Lee Joonho; Rao Mingjun; Li Guanghui; Jiang Tao;

  • 作者单位

    Cent S Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Hunan, Peoples R China;

    Guangdong Guangqing Met Technol Co Ltd, Yangjiang 529500, Guangdong, Peoples R China;

    Guangdong Guangqing Met Technol Co Ltd, Yangjiang 529500, Guangdong, Peoples R China;

    Korea Univ, Dept Mat Sci & Engn, Seoul 02841, South Korea;

    Cent S Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Hunan, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ferronickel slag; Selective recovery; Cr (III); Alkaline roasting; Water leaching;

    机译：镍铁渣;选择性回收;Cr（III）;碱性焙烧;水浸;

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