Process for refining glucosamine compound salt prepared by microbial fermentation method

The invention relates to the technical field of glucosamine preparation, and particularly relates to a process for refining glucosamine compound salt prepared by a microbial fermentation method. The process comprises the following steps of: (1) inoculating a fermentation agent into a culture medium for fermentation to obtain a fermentation liquor containing glucosamine, removing thalli in the obtained fermentation liquor to obtain a clear liquid, and adding a hydrochloric acid solution into the clear liquid for hydrolysis to obtain a hydrolysate containing glucosamine hydrochloride; (2) adding a decolorant into the hydrolysate, stirring, standing, and separating a decolorized solution for later use; (3) performing ultrafiltration treatment on the decolorized solution, and concentrating the obtained filtrate to obtain a concentrated solution for later use; and (4) adding sodium chloride into the concentrated solution, and preparing the concentrated solution into freeze-dried powder to obtain the refined glucos