The Research of the Synthesis of Manganese Minerals and the Adsorption of Rare Earth Elements by the Manganese Minerals

The Research of the Synthesis of Manganese Minerals and the Adsorption of Rare Earth Elements by the Manganese Minerals
　　This paper, firstly, introduces the types of manganese in the nature and the characteristics of the structure and formation of vernadite and birnessite in the ferromanganese nodules and cobalt-rich crusts. Then, it describes the methods to synthesize these two manganese minerals, as well as contast with the natural vernadite and birnessite. The powder XRD pattern of the synthetic birnessite provides four obvious characteristic peaks, 0.712nm,0.355nm,0.248nm and 0.144nm,and the synthetic sample is quite pure.The SEM pattern shows plate or laminated aggregate,Block neodymium magnet and the laminated structure.The IR pattern shows a strong peak at 644 cm-1.The powder XRD pattern of the synthetic vernadite provides two characteristic peaks, 0.240nm and 0.139nm, and the intensity is low. There are many dispersion peaks. The synthetic sample is quite pure. The SEM pattern shows curl lamina, slender fibre, and also the laminated structure. The IR pattern shows a Block neodymium magnet strong peak at 635 cm-1.The crystallinity of the systhetic birnessite and vernadite is not very good,and the pellet is tiny,some present in the amorphous state. That is because of short time of systhesis and atmospheric pressure.