Abstract: Slime was a byproduct of coal washing process,and the output was increaed day by day with the continuous improvement of the washing rate.The component of slime ash was mainly SiO2 and Al2O3,and these components were the raw materials to prepare molecular sieve.After the coal slime was pre-treated by calcination,acid leaching for removing iron,and alkali fusion,the method of hydrothermal synthesis was adopted to prepare13X molecular sieve.The results of XRD showed that n(SiO2/Al2O3),n(Na2O/SiO2) and n(H2O/Na2O) had a significant effect on the quality of the synthesized products.The optimum process conditions of the synthesis of water heat were determined by single factor experiment:the n (SiO2/Al2O3) was 4.0,the n (Na2O/SiO2) was 2.5,and the n (H2O/Na2 O)was 45.The SEM analyses showed that the self-prepared 13X molecular sieve with high purity had complete crystal shape and clear outline.This paper presents a new method to synthesize 13X zeolite with slime as raw material,which realizes the high added value of slime-comprehensive utilization which conforms to the sustainable development concept of the present day and has great utilization value.