Abstract:The process mineralogy of a phosphate rock in Vietnam was studied, The results show that the content of P₂O₅ in the phosphate rock is 21.85%, which is a low-grade phosphate rock. The main harmful element is SiO₂, with a content of 34.73%. The industrial type is siliceous and silicate type phosphorite. P₂O₅ mainly occurs in carbonate-fluorapatite and a small amount in wavellite, In the ore samples, the carbonaceous carbonate-fluorapatite is mainly clastic, euhedral short columnar and microcrystalline aggregate structure, while the argentite is columnar. SiO₂ mainly exists in siliceous minerals, and a small amount exists in silicate minerals. Removal of some siliceous minerals can meet the current requirements of wet process phosphoric acid ore. The phosphate rock is weathered ore with soft texture and easy to be broken and grinded. After grinding, the ore sample particles are enriched into fine particles. When grinding to - 0.038 mm, the monomer dissociation degree of carbonate-fluorapatite is 93.62%, and that of quartz and chalcedony is 95.49%. There are siliceous mineral blocks and lenses in the ore samples, which can be removed in the crushing stage or rough grinding stage to reduce the grinding cost. The high content of silicate minerals in ore samples will have adverse effects on the subsequent wet process phosphoric acid process, so it should be removed as much as possible.