Inorganic Chemicals Industry >

2023 , Vol. 55 >Issue 4: 97 - 103

DOI: https://doi.org/10.19964/j.issn.1006-4990.2022-0375

Environment·Health·Safety

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

  • ZHANG Chenhu ,
  • MA Yi ,
  • ZHU Shan ,
  • CHEN Peng ,
  • WANG Chengyong ,
  • LI Ziwen
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  • 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 date: 2022-06-20

  Online published: 2023-04-13

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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

Cite this article

ZHANG Chenhu , MA Yi , ZHU Shan , CHEN Peng , WANG Chengyong , LI Ziwen . Study on adsorption of heavy metal ions in mineral processing wastewater by chelating modified coal gangue[J]. Inorganic Chemicals Industry, 2023 , 55(4) : 97 -103 . DOI: 10.19964/j.issn.1006-4990.2022-0375

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