Abstract:In order to reduce the content of sesquioxide in phosphate ore concentrate and improve the quality of wet process phosphoric acid, XRF, polarizing microscope, SEM, MLA and other technical means were used to identify the mineral composition characteristics of phosphate ore, the occurrence characteristics of sesquioxide, grinding differentiation characteristics, and the dissociation characteristics of the host mineral monomer. The research results show that Fe₂O₃ mainly exists in limonite, mainly in the form of aggregation, star point dispersion, infection and vein distribution; Al₂O₃ is mainly hosted in muscovite and hydromica, in the form of fragments, and is a layered silicate mineral. After grinding, both Fe₂O₃ and Al₂O₃ exhibit differentiation characteristics towards fine-grained enrichment, and the monomer dissociation is good, providing a basic condition for mineral processing and removal. The surface of limonite and layered silicate minerals is hydrophilic, and it is difficult to remove phosphate rock by reverse flotation process.