| Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences | Host |
| Citation: |
ZHAO Yue, WANG Xiaoyan, YUAN Wenyi, ZHANG Qiwu. Mechanochemical Activated Coal Gangue One-step Preparation of High-efficiency Coagulant[J]. Conservation and Utilization of Mineral Resources, 2020, 40(1): 16-22. doi: 10.13779/j.cnki.issn1001-0076.2020.01.003
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Mechanochemical Activated Coal Gangue One-step Preparation of High-efficiency Coagulant
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Abstract
Taking kaolinite as an example, A novel process to prepare aluminum-sulfuric acid coagulant is examined by the high-energy ball milling activation of Coal gangue, followed by co-grinding with concentrated sulfuric acid, instead of the traditional high-temperature activated acid-alkali process. The prepared coagulant is characterized by X-ray diffraction (XRD), transmission electron microscope (TEM) and nuclear magnetic resonance (CP/MAS NMR). Besides, the performance of the coagulant was evaluated by the removal rate of pollutants such as turbidity, orthophosphate, pentavalent arsenic, and humic acid. The results show that the coagulant has high activity and the removal rates of the above four pollutants reach 95.95%, 91.2%, 89.6% and 93.73%, respectively. The prepared coagulant can be used as a substitute for the existing aluminum-based coagulant. The preparation process is simple, clean production and environmental-friendly, in addition, it expands a new route to utilize kaolinite-rich tailings of coal mining gangue etc and provides the use of high efficient coagulant cheaper possibility.
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Keywords:
- clean production /
- kaolinite /
- coal gangue /
- high-energy ball mill /
- coagulant
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References
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ZHAO Yue, WANG Xiaoyan, YUAN Wenyi, ZHANG Qiwu. Mechanochemical Activated Coal Gangue One-step Preparation of High-efficiency Coagulant[J]. Conservation and Utilization of Mineral Resources, 2020, 40(1): 16-22. doi: 10.13779/j.cnki.issn1001-0076.2020.01.003
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Figure 1.
XRD pattern before and after mechanical chemistry and ball milling of coal gangue
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Figure 2.
(a) coal gangue ore; (b) 2 h, 600 r/min coal gangue sample; (c) sample after acid mixing
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Figure 3.
Chemical shift and integral analysis of 27Al、29Si MAS NMR in kaolinite from coal gangue
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Figure 4.
(a) shows the removal effect of the finished product on kaolin turbid liquid after different acid addition, the dosage (in terms of Al) is 40 mg·L-1; (b) The figure shows the effect of 2 g coal gangue +0.8 g H2SO4 sample on the removal of kaolin turbid liquid at different mixing time (The amount of sample added is measured in terms of Al)
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Figure 5.
(a) shows the removal effect of coagulant on humic acid; (b) shows the removal effect of the coagulant on PO43-; (c) shows the effect of coagulant on the removal of pentavalent arsenic As (Ⅴ)