Nano Fe3O4/MnCO3+Li2CO3 precursor was prepared by synchronizing explosive nucleation of Fe3O4 and fast coating of MnCO3+Li2CO3 in a mini-channel impinging stream reactor. Subsequently

the precursor was heat-treated at 450℃ and immersed in dilute hydrochloric acid to obtain nano magnetic lithium ion sieves (LIS) composed of Fe3O4/HxMnyO4. The main factors affecting explosive nucleation and fast coating processes were investigated and optimized. The as-prepared products were characterized by BET

TEM

EDX

and XRD. The mean particle size of nano magnetic LIS was about 40 nm

specific magnetism was 27.581 emu·g-1

and coercive intensity was 138.64 G. Compared with ordinary LIS

nano LIS film had obvious advantages in solid phase diffusion

and promised unique capacity in lithium uptake from seawater.