Method and device for recycling white fertilizer slag

The invention discloses a phosphorus recovery method and device based on white fertilizer slag, and relates to the technical field of pyrogenic process phosphorus recovery. The white fertilizer residue recycling device comprises a support, an extraction barrel used for extracting white fertilizer residues is installed on the support, an extraction pipe used for collecting organic matter is rotationally arranged between the inner walls of the top end and the bottom end of the extraction barrel, and a plurality of isolation pieces are fixed to the inner wall of the extraction barrel from top to bottom; the extraction pipe penetrates through the middle parts of the plurality of isolation sheets, is rotationally connected with the isolation sheets and is used for collecting phosphorus-containing gas extracted from the white fertilizer residues on the isolation sheets. By arranging the feeding device, the extraction pipes, the isolation pieces, the discharging mechanism and other components, fine crushing of the w