The invention relates to the technical field of milk
powder production, in particular to a high-activity nutritional milk
powder production method based on wet
process optimization, which comprises the following steps: S1, adding raw materials into a vacuum mixer according to the following sequence, and carrying out vacuum high-speed hydration: adding
protein raw materials in batches, carrying out
vacuum mixing at 2960r / min, and carrying out hydration for 10min, adding the
carbohydrate raw materials and continuously mixing until the materials are uniformly mixed; s2, the
mixed solution is fed into a vacuum low-temperature concentration device to be concentrated, the vacuum degree in the concentration process is 0.09-0.06 MPa, the concentration temperature is smaller than or equal to 75 DEG C, and the concentration end point is controlled through an online
refractometer so that the
solid content can range from 42% to 46%; and S3,
drying the concentrated milk in a
spray dryer. According to the method disclosed by the invention, through an accurate feeding sequence of'first hydration of
protein and later feeding of
sugar 'and vacuum high-speed shearing and mixing, the influence on hydration due to the fact that the
protein is occupied by
sugar molecules is reduced, and the agglomeration and white spot defect rate after
drying is reduced.