Abstract: The high content of ammonia nitrogen in water will lead to “bloom”,“red tide”and other phenomena,destroy the ecological balance. In order to realize the efficient removal of ammonia nitrogen from industrial and domestic wastewater,the coal gasification based ammonia nitrogen adsorbent was prepared by using the product of rich carbon slag (RCS) from the bulk coal gasification slag separated by a water-medium cyclone,and its ammonia nitrogen adsorption performance was studied. The physical adsorption results show that the specific surface area of the adsorbent is 311 m~2/g. The structure of the adsorbent was characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM) and Fourier transform infrared absorption (FT-IR) spectroscopy. Relatively regular zeolite A and SAPO-20 molecular sieve heterocrystals were formed After the RCS hydrothermal treatment. Ammonia nitrogen adsorption experiments show that when the adsorbent solid-liquid ratio is 10 g/L,the initial pH value of the solution is 6.8,the initial ammonia concentration is 60.0 mg/L,and the contact time is 1 min,the equilibrium adsorption capacity of the adsorbent for ammonia nitrogen is 3.5 mg/g,and the removal rate reaches 51.0%. However,under the same conditions,the removal rate of ammonia nitrogen by RCS is only 8.1%. The adsorption isotherm of ammonia nitrogen by adsorbents conforms to Freundlich equation,and the adsorption behavior of ammonia nitrogen by adsorbents conforms to the quasi-first-order kinetic equation.