Mechanochemical Activated Coal Gangue One-step Preparation of High-efficiency Coagulant
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摘要:
以含高岭石类煤矸石为例，提出了利用高能球磨活化工艺诱导煤矸石中高岭石晶体结构破坏，并与硫酸混合一步制备粉末铝基混凝剂，代替传统的高温活化酸碱工艺的新思路。所制备的混凝剂通过XRD、TEM、CP/MAS NMR进行表征，并对浊度、正磷酸根、五价砷、及腐殖酸等多种污染物质的去除率来对该混凝剂性能进行评价。结果表明该混凝剂具有高活性并对以上四种污染物的去除率分别达到95.95%、91.2%、89.6%和93.73%。所制备的混凝剂能够成为现有铝基混凝剂的替代品，该制备工艺简单、清洁、环保、经济，拓展了含高岭石煤矸石尾矿利用新途径，并为更廉价而又高效的混凝剂的使用提供了可能。
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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Key words:
- clean production /
- kaolinite /
- coal gangue /
- high-energy ball mill /
- coagulant
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图 4 (a) 图中表示不同加酸量后的成品对高岭土浑浊液去除效果，投加量(以Al计)为40 mg·L-1；(b)图中表示2 g煤矸石+0.8 g H2SO4样品在不同混磨时间所展现对高岭土浑浊液去除的效果(投加量以Al计)
Figure 4.
表 1 贵州遵义含高岭石类煤矸石XRF成分分析
Table 1. XRF composition analysis of kaolinite containing kaolinite in Zunyi, Guizhou
Composition SiO2 Al2O3 TiO2 Fe2O3 CaO MgO Other Proportion (%) 55.52 21.42 4.58 0.78 1.01 0.78 15.91 
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