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首页> 外文期刊>Journal of Hazardous Materials >Effect of NaOH on the vitrification process of waste Ni-Cr sludge
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Effect of NaOH on the vitrification process of waste Ni-Cr sludge

机译：NaOH对Ni-Cr废渣玻璃化过程的影响

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摘要

This study investigated the effect of NaOH on the vitrification of electroplating sludge. Ni, the major metal in the electroplating sludge, is the target for recovery in the vitrification. Sludge and encapsulation materials (dolomite, limestone, and cullet) were mixed and various amounts of NaOH were added to serve as a glass modifier and a flux. A vitrification process at 1450 C separated the molten specimens into slag and ingot. The composition, crystalline characteristics, and leaching characteristics of samples were measured. The results indicate that the recovery of Ni is optimal with a 10% NaOH mass ratio; the recoveries of Fe, Cr, Zn, Cu, and Mn all exhibited similar trends. The results of the toxicity characteristic leaching procedure (TCLP) show that leaching characteristics of the slag meet the requirements of regulation in Taiwan. In addition, a semi-quantitative X-ray diffraction analysis revealed that the main crystalline phase of slag changed from Ca_3(Si_3O_9) to Na_4Ca_4(Si_6O_18) with a NaOH mass ratio of over 15%, because the Ca~(2+) ions were replaced with Na~* ions during the vitrification process. Na_4Ca_4(Si_6O_18). A complex mineral which hinders the mobility of metals, accounts for the decrease of metal recovery.
机译：本研究研究了NaOH对电镀污泥玻璃化的影响。电镀污泥中的主要金属Ni是回收玻璃化的目标。混合污泥和密封材料（白云石，石灰石和碎玻璃），并添加各种量的NaOH以用作玻璃改性剂和助熔剂。在1450 C的玻璃化过程中，将熔融的试样分离成炉渣和铸锭。测量了样品的组成，结晶特性和浸出特性。结果表明，Ni的回收率最佳，NaOH质量比为10％； Fe，Cr，Zn，Cu和Mn的回收率均表现出相似的趋势。毒性特征浸出程序（TCLP）的结果表明，炉渣的浸出特性符合台湾法规的要求。此外，半定量X射线衍射分析表明，由于Ca〜（2+）离子，炉渣的主要结晶相从Ca_3（Si_3O_9）变为Na_4Ca_4（Si_6O_18），NaOH的质量比超过15％。在玻璃化过程中被Na〜*离子取代。 Na_4Ca_4（Si_6O_18）。阻碍金属迁移的复杂矿物会降低金属的回收率。

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  • 来源
    《Journal of Hazardous Materials》 |2011年第3期|p.1522-1527|共6页
  • 作者

    I-Cheng Chou; Ya-Fen Wang; Cheng-Ping Chang; Chih-Ta Wang; Yi-Ming Kuo;

  • 作者单位

    Department of Safety Health and Environmental Engineering, Chung Hwa University of Medical Technology, 89 Wenhwa 1st St., Rende Shiang, Tainan County 71703, Taiwan, ROC;

    Department ofBioenvironmental Engineering and R&D Center of Membrane Technology, Chung Yuan Christian University, Chung-Li 320, Taiwan, ROC;

    Institute of Occupational Safety and Health, Council of Labor Affairs, Taipei City, Taiwan, ROC;

    Department of Safety Health and Environmental Engineering, Chung Hwa University of Medical Technology, 89 Wenhwa 1st St., Rende Shiang, Tainan County 71703, Taiwan, ROC;

    Department of Safety Health and Environmental Engineering, Chung Hwa University of Medical Technology, 89 Wenhwa 1st St., Rende Shiang, Tainan County 71703, Taiwan, ROC;

  • 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

    Electroplating sludge; Vitrification; Metal recovery;

    机译：电镀污泥;玻璃化;金属回收;

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