Abstract: The influences of the different dosage and acidity of suldeg dispersants including sodium hexametaphosphate，sodium carbonate，CMC，DB-6024，DB-60，DB-504，DB-503 to the flotation recovery of lizardite are systematically studied in the butyl xanthate system.It is obtained that the activation of serpentine was decreased gradually by DB-504，DB-503，DB-60，sodium carbonate，DB-6024 in turn，while sodium hexametaphosphate had a weak inhibition effect and CMC had a strong inhibiting effect.Then，briefly introduced the action mechanism of butyl xanthate，sodium hexametaphosphate，CMC，DB-503 with lizardite.

Key words: Lizardite, Butyl xanthate, Dispersant, Inhibition, Activation