GB411446A - Improvements relating to the conversion of pulverulent and slurry-like materials into nodules - Google Patents

Abstract

411,446. Mixing-apparatus. FASTING, J. S., 9, Monrads Alle, Copenhagen. Dec. 5, 1932, No. 34481. [Class 86.] Pulverulent or slurry like materials, e.g. raw cement, are converted into nodules by being passed through a rotary drum wherein they are subjected both to tumbling due to the rotation of the drum and to compression by a positively driven member or members in contact with or digging into the material. Preferably the compression member comprises radial arms on a shaft rotating in the opposite direction to that of the drum. As shown in Figs. 1 and 2, the apparatus comprises a horizontal rotating drum 1 and a rotating compression device comprising an eccentrically mounted shaft 3 having radial arms 6 arranged to dig into the charge of material. The drum and compression device rotate in opposite directions as indicated by the arrows. The material is fed into the drum, through a stationary hopper 7, either with the necessary water content or as a dry powder, in which case water is sprayed on to the material from a pipe 8. In a modification, a cylindrical screening device is provided at the outlet end of the drum for separating grains under a certain size, and an outer drum is provided for conveying these small grains back to the hopper. When treating slurry, dry material, such as calcined or partly calcined cement may be added to the dewatered slurry to prevent sticking. The mixture of dewatered slurry and calcined material may be kneaded in a roller mill before it is fed to the drum.