Verfahren zur Herstellung von geformter Aktivkohle

Abstract

DE 4234785 A UPAB: 19931025 Prepn. of moulded- or granulated active carbon in a rotary pipe kiln by means of gas/steam activation at 900-1000degC and addn of steam and sec air comprises: (i) grinding the dried slurry granulate and lignocellulose-contg. products, so that all the particles are smaller than 0.04mm and 80% or more are smaller than 0.03mm; (ii) mixing the finely-ground particles and then pressing or extruding with a binding agent, with a binding agent: solid ratio of 10-60:90-40%; (iii) hardening the articles in an ac rotary pipe kiln at 200-400degC; and (iv) carbonising the articles in a directly-heated dc rotary pipe kiln at 500-700degC in the absence of air, to give the activated prod. USE/ADVANTAGE - Active carbon is useful for the recovery of solvents and for the purification of air and water. Active carbon is prepd. from cheap, readily-available, environmentally harmful starting materials