无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2023, Vol. 55 ›› Issue (4): 97-103.doi: 10.19964/j.issn.1006-4990.2022-0375

• 环境·健康·安全 • 上一篇    下一篇

煤矸石螯合改性后对选矿废水中重金属离子吸附研究

张谌虎1,3(), 马毅2, 朱山1,3, 陈鹏1,3, 王成勇1,3, 李子文1,3   

  1. 1.六盘水师范学院矿业与机械工程学院,贵州 六盘水 553004
    2.六盘水中联工贸实业有限公司,贵州 六盘水 553000
    3.贵州省煤炭洁净利用重点实验室,贵州 六盘水 553004
  • 收稿日期:2022-06-20 出版日期:2023-04-10 发布日期:2023-04-13
  • 作者简介:张谌虎(1986— ),男,博士,副教授,硕导,主要研究领域为非金属选矿与固废综合利用;E-mail:lupin626@163.com
  • 基金资助:
    贵州省教育厅基金项目(黔教合KY字[2019]136);贵州省教育厅基金项目(黔教合KY字[2019]140);六盘水市科技计划项目(52020-2019-05-06);六盘水市科技计划项目(52020-2019-05-08);六盘水师范学院科技创新团队(LPSSYKJTD201906)

Study on adsorption of heavy metal ions in mineral processing wastewater by chelating modified coal gangue

ZHANG Chenhu1,3(), MA Yi2, ZHU Shan1,3, CHEN Peng1,3, WANG Chengyong1,3, LI Ziwen1,3   

  1. 1. School of Mining and Mechanical Engineering,Liupanshui Normal University,Liupanshui 553004,China
    2. Liupanshui Zhonglian Industry and Trade Co. ,Ltd. ,Liupanshui 553000,China
    3. Guizhou Provincial Key Laboratory;of Coal Clean Utilization,Liupanshui 553004,China
  • Received:2022-06-20 Published:2023-04-10 Online:2023-04-13

摘要:

选取贵州省某6个矿区煤矸石进行均匀混合,通过700 ℃煅烧后获得热活化的样品。采用螯合剂次氮基三乙酸(NTA)与羧甲基淀粉(CMS)对热活化的样品进行改性,制备低成本的改性煤矸石吸附剂。通过单因素静态吸附实验分别研究了pH、CMS与NTA固液比、吸附剂投加量、吸附时间等对改性煤矸石吸附废水中Cu2+和Pb2+的影响。结果表明,在焙烧温度为700 ℃、CMS与NTA最佳固液质量比(简称固液比)为1∶15、溶液pH=9、吸附时间为2 h、投放量为0.8 g/L条件下,改性煤矸石能够吸附选矿废水中大量Cu2+和Pb2+,最佳去除率分别为69.34%和79.98%。结合吸附等温模型拟合分析,吸附剂对Pb2+的吸附过程以单层的化学吸附为主。

关键词: 煤矸石, 表面改性, 螯合剂, 重金属离子

Abstract:

The coal gangue from 6 mining areas in Guizhou province was mixed evenly and the thermal activated samples were obtained after calcination at 700 ℃.The coal gangue was modified by chelating agent NTA and carboxymethyl starch(CMS)and the low cost modified coal gangue adsorbent was prepared.The effects of pH value,solid-liquid ratio of CMS and NTA,adsorbent dosage and adsorption time on the adsorption of Cu2+ and Pb2+ from wastewater by modified coal gangue were studied by single factor static adsorption experiment.The results showed that the modified coal gangue could adsorb a large amount of Cu2+ and Pb2+ from mineral processing wastewater under the roasting temperature of 700 ℃,the optimal solid-liquid ratio of CMS and NTA of 1∶15,the solution pH of 9,the adsorption time of 2 h,and the dosage of 0.8 g/L.The optimal removal rates were 69.34% and 79.98%,respectively.Combined with the isothermal model fitting analysis,the adsorption process of Pb2+ was dominated by monolayer chemisorption.

Key words: coal gangue, surface modification, chelating agent, heavy metal ion

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