Abstract: A method of producing fertilizer out of sludge, in which method sludge is heated with superheated steam for achieving hygienization to destroy pathogenic microorganisms. In the method, the sludge is heated to a temperature of 60 to 100° C. with superheated steam having a temperature of 200 to 600° C. to activate increasing of the amount of soluble carbon in the sludge and to restart biodegradation of the sludge by using non-pathogenic microorganisms still remaining in the sludge after the heating.

Abstract: A method of producing fertilizer out of sludge, in which method sludge is heated with superheated steam for achieving hygienization to destroy pathogenic microorganisms. In the method, the sludge is heated to a temperature of 60 to 100° C. with superheated steam having a temperature of 200 to 600° C. to activate increasing of the amount of soluble carbon in the sludge and to restart biodegradation of the sludge by using non-pathogenic microorganisms still remaining in the sludge after the heating.

Abstract: A gyratory crusher having a frame (1) and in the frame an eccentric shaft (3) rotatable around a vertical shaft in the frame, with a vertical inclined hole in it. A main shaft (4) is supported by bearings in the hold of the eccentric shaft, a supporting cone (5) being attached to the upper end of said main shaft (4). Around the main shaft, below the supporting cone (5) there is a sealing cover (10) covering the eccentric shaft. The upper edge (12) of the sealing cover (10) is sealed against the main shaft (4) by means of a sealing member (13), the outer edge of which has been fitted in an annular groove (17) on the inner edge (12) of the sealing cover (10). The face-to-face arranged upper and lower surfaces so the part (13") of the sealing member (13) in the groove and the groove (17) of the sealing cover (10) are inclined so that their outer edges are higher up than their inner edges.