Abstract: In this paper,Myxococcus xanthusandPseudomonas aeruginosa, which are common in the rare earth mining environment, were prepared, and the solution behaviors of the two bacteria and their fermentation broth during the interaction with ion-type rare earth ore were comparatively studied. The morphology, structure, distribution of rare earth elements and functional groups of the cells and mineral phases were analyzed by means of scanning electron microscopy, transmission electron microscopy, X-ray diffraction and Fourier infrared spectroscopy. The results showed that there were some differences in the interaction processes of theM. xanthusandP. aeruginosaon rare earth minerals. In the leaching process of rare earth minerals, the direct-action system ofP. aeruginosawas better than that of the indirect-action system of the fermentation broth, while the direct-action system of theM. xanthuswas weaker than that of the indirect action system of the fermentation liquid. In addition, the presence of rare earth minerals can promote the secretion of lipid and protein components ofM. xanthusand inhibit the secretion of polysaccharide components, while forP. aeruginosa, the presence of rare earth minerals has little effect on the secretion of lipid and protein components but promotes the secretion of polysaccharide components.

Key words: ionic rare earth ore;Myxococcus xanthus;Pseudomonas aeruginosa, mineral characterization；microbial-mineral interaction