• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Accelerated co-precipitation of lead, zinc and copper by carbon dioxide bubbling in alkaline municipal solid waste incinerator (MSWI) fly ash wash water
【24h】

Accelerated co-precipitation of lead, zinc and copper by carbon dioxide bubbling in alkaline municipal solid waste incinerator (MSWI) fly ash wash water

机译：通过碱性城市固体废物焚烧炉（MSWI）粉煤灰洗涤水的二氧化碳血液激增加速，锌和铜的共沉淀

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

MSWI fly ash is a potential substitute for some virgin materials, but the soluble salts and hazardous trace elements in the ash can limit this potential. This study investigated the use of a water-based washing process to remove the soluble salts from MSWI fly ash. The removal of trace elements by bubbling CO2 through the resulting wastewater was also evaluated and compared to the use of a Na2CO3 solution. Washing was accomplished at liquid-to-solid ratios (L/S) (L kg(-1)) ranging from 3 to 20, and at durations from 5 min to 1 h. The optimum washing condition was identified by an orthogonal test and an L/S ratio of 10 for 10 min. The extraction of chlorides by washing ranged from 62% to 95%, while the extraction of sulfate was less than 50% because the solubility of these salts was strongly influenced by the L/S ratio. Critical trace elements (lead, zinc and copper) were also leached in high concentrations (63.7 mg L-1, 4.53 mg L-1 and 0.40 mg L-1, respectively) at the optimum washing condition. These elements were effectively removed in the CaCO3 or ferrum/aluminum-hydroxides that precipitated when CO2 was bubbled into the wastewater. Various analyses showed that the precipitate was primarily CaCO3 which formed into spheres. The concentration of trace elements incorporated into the precipitate varied across the radius of the sphere. A geochemical model was used to help explain the mechanism of trace element precipitation. The accelerated carbonation of the alkaline MSWI fly ash wash water was effective in removing trace elements (Pb, Zn and Cu).
机译：Mswi粉煤灰是一些原始材料的潜在替代品，但灰中的可溶性盐和危险的微量元素可以限制这种潜力。本研究调查了使用水基洗涤过程从MSWI粉煤灰中除去可溶性盐。还评估了通过起泡CO 2通过制备CO 2来除去微量元素，并与使用Na 2 CO 3溶液进行比较。以3至20的液 - 固体比率（L / S）（L kg（-1））和5分钟至1小时的持续时间完成洗涤。通过正交试验鉴定最佳洗涤条件和10分钟的L / S比例。通过洗涤的氯化物的提取范围为62％至95％，而硫酸盐的提取小于50％，因为这些盐的溶解度受L / S比的强烈影响。在最佳洗涤条件下，还在高浓度（63.7mg L-1,4.53mg L-1和0.40mg L-1和0.40mg L-1和0.40mg L-1）中浸出关键的微量元素（铅，锌和铜）。当将CO 2鼓泡到废水中时，在CaCO 3或铁矾/氢氧化物中有效地除去这些元件。各种分析表明，沉淀物主要是形成球体的CaCO 3。掺入沉淀物中的微量元素的浓度在球体的半径上变化。地球化学模型用于帮助解释痕量元素沉淀的机制。碱性Mswi飞灰洗涤水的加速碳酸化可有效除去微量元素（Pb，Zn和Cu）。

著录项

  • 来源
    《RSC Advances》 |2016年第24期|共14页
  • 作者

    Wang L.; Chen Q.; Jamro I. A.; Li R. D.; Baloch H. A.;

  • 作者单位

    Shenyang Aerosp Univ Coll Energy &

    Environm Shenyang 110036 Peoples R China;

    Shenyang Aerosp Univ Coll Energy &

    Environm Shenyang 110036 Peoples R China;

    Shenyang Aerosp Univ Coll Energy &

    Environm Shenyang 110036 Peoples R China;

    Shenyang Aerosp Univ Coll Energy &

    Environm Shenyang 110036 Peoples R China;

    Shenyang Aerosp Univ Coll Energy &

    Environm Shenyang 110036 Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号