Study on process mineralogy of the high grade phosphorite in Yangchang phosphate deposit, Zhenxiong, Yunnan Province.

The Yangchang phosphate deposit in Zhenxiong County, Yunnan Province is a super large sedimentary phosphate deposit evaluated in recent years in the Early Cambrian period. It is characterized by large resource re-serves, excellent ore quality, and concentrated resource distribution, and is currently the largest hidden single rich phosphate deposit in Asia. This article mainly uses different analysis methods to conduct systematic mineralogical research on the chemical composition, mineral composition, embedding characteristics, embedding particle size and intergrowth relationship, dissociation degree of the phosphate ore in the deposit. The grinding fineness and ore sorting process methods are also preliminarily explored. Our results show that the samples in this study are high-grade silicon calcium carbonate phosphate ore, with a P₂O₅ content of 29.34%. The main P-bearing mineral in the ore is fluorapatite which commonly distribute as hidden crystal microcrystal aggregates (commonly known as collophane). The main gangue minerals are quartz, calcite, dolomite, and a small amount of pyrite. The ore is characterized by low magnesium and low silicon, and can be processed using the direct-reverse flotation method. The ore has fine particle size and complex interrelationships, making it difficult to dissociate. During the beneficiation, fine grinding is required to increase the degree of monomer dissociation, but the impact of mechanical entrainment and mud formation caused by excessive grinding on flotation indicators should be paid special attention. The ore has reached the phosphate concentrate index and can be directly processed and utilized. If beneficiation is required, it is recommended to focus on studying the grinding process and exploring joint beneficiation methods to achieve the desired beneficiation effect. [ABSTRACT FROM AUTHOR]