Method for controlling radial slag alkalinity of blast furnace

The invention belongs to the technical field of blast furnace operation control, and relates to a blast furnace radial slag alkalinity control method, which comprises the following steps: S1, blast furnace ore tanks are arranged in double rows; s2, calculating the usage amount of the mineral aggregate in each ore groove according to alkalinity balance in each middle section; and S3, the method for calculating the alkalinity of the slag in the middle section comprises the following steps: (1) all pellets are acidic pellets, the sintering weight of the middle section/the weight of the pellets lambda is equal to (the total sintering weight-the fixed using amount of the sintering material head-the fixed using amount of the sintering material tail)/the total weight of the pellets, and the using amount of mineral aggregates in each ore tank is calculated according to the proportion; (2) acidic pellets and alkaline pellets exist, corresponding sintering of an alkaline pellet ore groove is equal to (lambda-alpha) * a