This paper conducts an analytical investigation of three different sections of a pit in 27SiMn,finds Mn-enrichment at the pitting front end by means of SEM+EXD examination and explains the Mn-enr ichment phenomenon.

Experimental research on cold bonding briquette of MnSi alloy powder with adding manganese ore fines;

The process investigation of preparing anhydrous MnCl_2 from manganese-rich slag;

To reduce electricity consumption, the process of preheating manganese ore and hot charging in rotary kiln is to adopted to produce manganese-rich slag for smelting metal manganese and high carbon ferromanganese.

During the experiment, smelting parameters such as smelting temperature, smelting time, material particle size, slag basicity and manganese-rich slag ratio were adjusted to lead to electricity decrease.

Removal of impurity in the production of MnSO_4·H_2O from rich-manganese slag;

Preparation of 4A molecular sieves from rich-manganese slag;

We have prepared 4A molecular sieves in hydrothermal environmental from rich-manganese slag.

The biological treatment plan was suggested for enriching manganese and dephosphorization of high phosphorus and poor rhodochrosite ore.

Taking Yunnans typical Mn ore for example, this paper describes Yunnans high quality and rich Mn ores, including their production, geological characters, formation of ore deposit, their distribution, forming period and some other associating characters.