1, The action mechanism of microbiological oxidation of rhodochrosite has been investigated by batch operation.

2, Datangpo Rhodochrosite Deposit in Songtao County, Guizhou, is one of important manganese deposits in China, whose ore bodies occur in a special form of ore pillows.

3, Ore minerals are composed of psilomelane, pyrolusite, braunite, rhodochrosite and manganocalcite and gangue minerals are composed of magnetite, goethite and pyrite and so on.

4, Rhodochrosite was used as raw material for this pelletizing study, and the appropreate process parameters and production quality were studied.

5, There are plenty of high-phosphorus and poor rhodochrosite resources in China. The present conditions of manganese resources and its processing in China were discussed.

6, The process of preparing manganese from rhodochrosite by acid—leaching is studied and the optimum leaching condition is obtained.

7, In view of the problems above, this paper put forward a new craft route, which was preparing manganous sulfate from rhodochrosite by acid-leaching as raw material to get manganic manganous oxide.

8, This paper describes the Mn production and puts forward a new method to mine low-grade rhodochrosite using solving and soaking. The experimental results are presented in the paper.