Abstract:Using polarizing microscope,MLA system, energy spectrometer and other equipment to carry out systematic process mineralogical study of silicate phosphate rock in Guizhou Zhijin,find out the ore mineral composition, structure, basic parameters and characteristics of main minerals. The main gangue mineral in the phosphate rock is chalcedony. The ore dressing needs to remove more chalcedony to reach the concentrate index. Secondly, the sample has a high content of silicate minerals, and some silicate minerals are also removed to reduce its adverse effects on the subsequent wet-process phosphoric acid process. The collophanite in the ore sample is mainly composed of agglomerate, gelatinous and crumb-like structures. Closely and disorderly distributed with the gangue minerals,the collophanite, quartz and chalcedony are all fine-grained and need fine grinding to dissociate more collophanite and gangue minerals. Grinding to fineness of -75μm accounted for 99.41%, colloidal phosphate monomer dissociation degree of 72.88%, dissociation is not ideal, and fine grinding makes -30μm fractional yield greatly increased, resulting in secondary mud formation it reduces the selectivity of flotation reagents and increases the difficulty of beneficiation. It is difficult for the ore sample to dissociate useful minerals and gangue minerals by grinding, so it is difficult to achieve an ideal and economical selection index by flotation. It is recommended that this type of ore and other types of ore be used for ore blending to achieve comprehensive utilization of resources.