The invention provides a method for recycling
calcium salt
slag in a
calcium pantothenate synthesis process, which comprises the following steps: 1) carrying out
solvent removal on the
calcium salt
slag by using a horizontal double-shaft dryer to obtain dealcoholized calcium salt
slag powder; 2) pulping and mixing the calcium salt slag
powder and water to obtain calcium salt slag water
slurry; 3) reacting the calcium salt slag
aqueous solution with
sulfuric acid to obtain a
neutralization solution; 4) carrying out
solid-liquid separation on the neutralized liquid to obtain calcium
sulfate residues and a beta-aminopropionic acid
aqueous solution; 5) carrying out continuous decompression
dehydration concentration on the beta-aminopropionic acid
aqueous solution to obtain a concentrated solution and water; returning the water to the step 2) for mechanical application; (6) cooling and crystallizing the concentrated solution, and centrifugally separating to obtain a beta-aminopropionic acid wet product and a mother solution; and returning the
mother liquor to the step (5) for mechanical application. According to the method, residual calcium
propionate and
methanol in the calcium salt slag can be recycled, the material
utilization rate is increased, and the production cost is reduced; and after residual organic matters in the calcium salt slag are completely recovered, the total amount of dangerous
solid wastes is greatly reduced, so that the
solid waste treatment cost is reduced.