A process for preparing activated carbon from urban waste

C - Chemistry – Metallurgy – 01 – B

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C01B 31/08 (2006.01)

Patent

CA 2336777

A process for the preparation of active carbon from urban waste. The waste is first stored to remove foreign materials and the size of the waste particles is reduced. The waste is dried under anaerobic conditions at a temperature range of 100 ~C - 150 ~C and partially pyrolysed at a temperature of about 140 ~C - 400 ~C. The obtained product is granulated and the granules are carbonized under anaerobic conditions at a temperature of about 120 ~C - 500 ~C. The carbonized granules are activated in the presence of steam and combustion gases at 750 ~C - 900 ~C. Finally, the activated granules are purified by rinsing in an aqueous HCl solution, and subsequently drying the activated carbon.

Ce procédé de préparation de charbon activé à partir d'ordures ménagères comprend les étapes consistant d'abord à stocker les ordures pour en enlever les matériaux étrangers et réduire la dimension des particules des ordures, puis à sécher les ordures dans des conditions anaérobiques, à une températures comprise entre 100 et 150 ·C, à pyrolyser partiellement ces ordures à une température comprise entre 140 et 400 ·C, à granuler le produit obtenu, à carboniser les granules obtenus, dans des conditions anaérobiques, à une température de l'ordre de 120 à 500 ·C, les granules carbonisés étant activés en présence de vapeur et de gaz de combustion à une température comprise entre 750 et 900 ·C, enfin, à purifier les granules activés en les rinçant dans une solution aqueuse de HCl et à sécher ultérieurement le charbon activé.

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