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Co-crystalline zeolite FAU/LTA-0 was synthesized by hydrothermal method from lithium slag.To make the most of excess silicon and alkali sources in mother liquid derived from FAU/LTA-0,zeolite FAU/LTA-1b was synthesized in the same method with the use of mother liquid by adding a certain amount of aluminum source.Influences of different adding ways of aluminum source and recycling dosages of mother liquid on synthesis of zeolites FAU/LTA with mother liquid were investigated.The phase,microstructure and thermostability of FAU/LTA-0 and FAU/LTA-1b were characterized by XRD,SEM and TG-DTA.The calcium and magnesium cation exchange capacities(CECs) of the zeolites were determined.The results have shown that co-crystalline zeolite can be synthesized with the use of mother liquid by adding aluminum source after 2 h of reaction.Compared with FAU/LTA-0,the crystal twinning structure of FAU/LTA-1b became weaker,the grain size was smaller,and the thermostability was better.With a lower dosage of mother liquid,the content of P-type impurity in product decreased significantly,and the content of LTA phase increased.The reuse rate of mother liquid can reach 48%.The CECs of FAU/LTA-1b-150 can reach 343 mg CaCO3·g-1 and 180 mg MgCO3·g-1,showing more excellent adsorption capacities than FAU/LTA-0 and commercial zeolite 4A.The full recycling use of mother liquid to synthesize zeolite FAU/LTA which can be applied for detergent not only improves resource utilization but also reduces production cost.