dampened to provide a more steady flow of and a more uniform pressure on the material being extruded upon exiting the extrusion aperture portion 50 the extrudite product 58 see fig7 passes the ninety degree exit ledge 54 on one side of passage 46 but is confined by the transverse pressure ledge 56 at the opposite side of the passage 46 as illustrated in fig7 the extrudite product 58 upon passing through the stress relief zone portion 52 is subjected to a transverse stress which develops micro structure fracture lines 60 that result in the fracturing of the extrudite product 58 into rather uniform length pellets 62 which are subsequently dried and hardened as described below there is thus eliminated the need of a cutting device for cutting the extrudite into pellets as illustrated in fig9 the process of the present invention comprises mixing the limestone fines with a suitable binder plasticizing the dry mix through the addition of water while mixing and working the plastic mass material extruding the plastic mass material in accordance with the description above and then air drying and vibrating the resulting extrudite to insure the fracturing thereof into relatively uniform pellets see fig7 the pellets are then subjected to hot air drying to obtain desired hardness and liquid dispersibility characteristics in actual tests using the apparatus described above it has been observed that limestone pellets having desirable hardness dispersibility and size of 8 12 mesh may be formed according to the following steps 1 mixing.