PROBLEM TO BE SOLVED: To easily eliminate the segregation of powder and granular materials, such as foundry sands, which are irregular in grain sizes and in which the segregation occurs by the operation of classifying and remixing. SOLUTION: This equipment has classifying equipment 1 for classifying the powder and granular materials M, such as the foundry sands which are irregular in the grain sizes and in which the segregation occurs to a plurality of levels and remixing equipment 2 which remix the powder and granular materials M1, M3 and M3 of the respective classified levels at prescribed ratios. The remixing equipment 2 has classifying hoppers 9a, 9b and 9c which respectively once store the powder and granular materials M1, M3 and M3 of the respective classified levels, feeding feeders 10a, 10b and 10c which are attached to the outlets at the bottoms of the respective classifying hoppers at prescribed feeding speeds and a belt conveyor 11 for remixing which travels by carrying the powder and granular materials M1, M3 and M3 taken out of the respective feeding feeders.
