煤矸石螯合改性后对选矿废水中重金属离子吸附研究

doi:10.19964/j.issn.1006-4990.2022-0375

Abstract

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

CLC Number:

X703

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.

Figures/Tables 11

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样本	w（SiO₂）	w （Al₂O₃）	w （TFe）	w （CaO）	w （MgO）	w （Na₂O）	w （K₂O）	w （TiO₂）
1	45.88	11.69	8.69	2.00	3.21	1.58	2.11	2.68
2	46.38	12.37	7.65	1.22	2.88	1.01	1.67	4.33
3	45.05	10.85	8.35	1.94	2.01	1.22	1.25	2.52
4	43.22	11.38	5.68	1.41	0.68	1.02	1.33	3.41
5	43.89	14.38	7.33	0.85	1.85	1.35	1.84	3.29
6	45.37	13.68	9.91	1.14	2.14	1.17	1.01	4.77

T/℃	Langmuir			Freundlich
T/℃	Q/ （mg·g^-1）	K_L/ （L·mg^-1）	R²	n	K_F/ （mg^1-1/ⁿ ·L^1/ⁿ ·g^-1）	R²
20	96.33	0.236 8	0.989 5	3.89	25.07	0.956 6
25	100.87	0.209 0	0.992 8	3.54	21.10	0.962 6
30	103.88	0.220 5	0.991 7	2.89	14.00	0.975 9

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

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