Refined sugar clarifying method

A refined sugar clarifying method comprises steps as follows: cleaning up a pigment on the surface of raw sugar with molasses to obtain molasses-cleaned raw sugar; dissolving the molasses-cleaned raw sugar in hot water to obtain re-dissolved syrup for use; performing carbonation on the re-dissolved syrup twice to obtain second carbonation syrup; filtering the second carbonation syrup with a plate-and-frame filter press to obtain filtered syrup; pumping the filtered syrup to a ceramic-membrane microfiltration working tank, and performing microfiltration clarification on the filtered syrup with a ceramic membrane with the membrane pore diameters ranging from 0.2 mu m to 0.5 mu m to obtain a clear syrup for use; cooling the clear syrup with a plate heat exchanger and then sending the clear syrup to a first ion exchange resin column to obtain a first infiltration liquid, and then sending the first infiltration liquid to a second ion exchange resin column to obtain a second infiltration liquid, that is, refined sugar. The re-dissolved syrup subjected to carbonation and filtration by the aid of the plate-and-frame filter press is clarified by the ceramic microfiltration membrane, so that the turbidity of the re-dissolved syrup before the re-dissolved syrup enters ion exchange resin is reduced, and the service life of the ion exchange resin is prolonged.