With modified fly ash,coal gangue and water granulated slag as absorbent,the ability and kinetics of adsorption of Ammonia-Nitrogen in rare earth waster water by such 3 waste residue are studied,involving discussions on adsorption equilibrium time,reaction orders,adsorption rate control steps and effective diffusion coefficient,and the adsorption ability of the 3 waste residue are compared.The results showed:fly ash and water granulated slag reach adsorption equilibrium faster;coal gangue results has best correlation 0.9978 with quasi secondary kinetics fitting straight line;chemical reaction is the control step for adsorption of fly ash and water granulated slag,liquid film diffusion and partical diffusion are control steps for coal gangue adsorption.
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