Experimental Study on Preparation of Silicon Fertilizer from Mechanically Activated Coal Gangue
In order to increase the content of available silicon in coal gangue,mechanical activation(dry activation and wet activation)was used to treat coal gangue.The influence of different activation conditions on the dissolution of available silicon in coal gangue was investigated.The results showed that when the grinding frequency was 30 Hz,ball to material ratio was 4,and dry activation time was 3 h,the available silicon dissolution amount in the coal gangue reached 3 500 mg/kg,which was 11.99 times of that in the inactive state(292 mg/kg).SEM,XRD,and FTIR analysis showed that mechanical activation could disrupt the crystal structure of minerals in coal gangue,reduce the crystallinity,and thereby enhancing the dissolution of available silicon.Futher verification showed that mechanical activation could increase the available silicon dissolution of minerals such as muscovite,kaolinite,and serpentine in coal gangue.
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