Abstract: The beneficiation of phosphate ores containing carbonate gangue by conventional techniques，such as physical separation methods or flotation，is very difficult due to the similarities in physic-chemical properties of constituent minerals present in the system.Generally，sedimentary phosphate ores can be processed by calcinations and selective acid leaching methods.The selective leaching with acetic acid is a promising beneficiation way.Acetic acid was used to reduce the carbonate content of the phosphate rock，in order to enrich the content of P₂O₅.Experiment result indicated:the main factors of influencing acetic acid decompose dolomite were temperature，particle size，acid concentration，and reaction time etc..Under the optimal operating conditions，it was found that the mass fraction of P₂O₅ could be raised from 19.72% to 33.78% along with corresponding decomposition rate of dolomite 27.45%.

Key words: phosphate ores, selective leaching, acetic acid