A medium - low grade phosphate ore beneficiation methods, belonging to the technical field of mineral processing. It includes: the ore dressing process of heavy medium beneficiation-double reverse flotation, the middle and low grade colloidal phosphate mine is firstly subjected to heavy medium beneficiation to realize the refining and tailing, and the obtained concentrate is subjected to double reverse flotation, in addition to magnesium reduction. Silicon, producing qualified phosphate concentrate products. The high-quality concentrate with P2O5 20~26% is only rich in P2O5 20~26%, MgO≤1%, the recovery rate is over 80%, and the concentrate can be used as qualified raw material for producing ammonium phosphate. It solves the problem that the medium and low grade phosphate rock is difficult to be industrially utilized.

SHANDONG PSL is professional engaged in pipeline solution,manufacture and supply Ductile iron all flanged tee with the premium quality raw materials,ensure high durability and strength. The coating can be blue epoxy powder or black bituminous paint,can meet various industrial requirements.Corrosion resistent construction,working life is longer than normal pipe fittings.PN10 and PN16 are available;Available in T Type and K Type;Available from DN80-400.