Process for enlarging the surface of particles

摘要

PCT No. PCT/EP97/05263 Sec. 371 Date Mar. 16, 1999 Sec. 102(e) Date Mar. 16, 1999 PCT Filed Sep. 25, 1997 PCT Pub. No. WO98/13132 PCT Pub. Date Apr. 2, 1998In order to enlarge the surface of particles which absorb liquids at least to a limited extent, the particles are exposed to a liquid or to a humid atmosphere containing this liquid at least until said liquid has penetrated into the area of the particles close to their surface, and the liquid-containing particles are then irradiated with micro-waves until the penetrated liquid evaporates. The surface of the particles is torn down to the depth of penetration of the liquid and thus enlarged, or the particles break up, creating small broken pieces with an irregular and enlarged surface.