Abstract: As huge volume of solid wastes，study on how to exploit and utilize coal gangue has a vital significance to establishing an environment friendly and resource saving country.The effects of roasting temperature，solid-liquid ratio in aging，aging time，crystallization time on absorption properties of simulated ammonia nitrogen wastewater with zeolite synthesis were studied by process of alkali fusion-aging-crystallization，using coal gangue from Inner Mongolia as raw material and ammonia-nitrogen wastewater from simulating production of rare earth as absorbing object.The result showed that with the roast temperature of 600 ℃，the liquid-solid ratio 14 mL/g，for 20 h's aging and 1 h's crystallization，the synthesized coal gangue zeolite had a good adsorption property to ammonia-nitrogen wastewater，with the adsorption capacity of ammonia-nitrogen at 3.74 mg/g，and the removal rate of up to 74.80%.SEM and XRD analysis on the products showed that alkali fusion changed the composition of coal gangue，and the synthesized zeolite with relatively better crystallinity was obtained after alkali fusion product were aged and crystallized.This zeolite belongs to A-type zeolite.

Key words: Coal gangue, Zeolite, Alkali fusion, Aging, Crystallization, Ammonia-nitrogen