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Molding and Characterization of Powder Activated Carbon with High-Si Ash Made from Distilled Spirits Lees

ZHAO Wei1,2,WANG Yin1,LI Qiang3,YANG Juan1,LIU Yun-yi2,XU Guang-wen1(1. National Key Laboratory of Multi-phase Complex Systems,Institute of Process Engineering,CAS,Beijing 100190,China;2. College of Chemical Engineering,Shenyang Institute of Chemical Technology,Shenyang,Liaoning 110142,China;3. CNOOC New Energy Investment Co.,Ltd.,Beijing 100016,China)  
The activated carbon(AC) made from distilled spirits lees has high content of Si-rich ash. The molding methods of such AC by using carboxymethyl cellulose(CMC) ,coal tar and leaching solution from alkali treatment of the high-Si ash AC as the binder were investigated. The results showed that using only CMC or coal tar as the binder,the compressive strength of molded AC at a pressing pressure of 4 MPa reached the expected 120 N/cm,but the iodine adsorption capacity was lower than 400 mg/g. When using the silica alumina sol made with the leaching solution as the binder,mixing silica alumina sol and a small amount of CMC allowed the molded AC to have the satisfied compressive strength,while its adsorption capacity of iodine reached over 600 mg/g,higher than the AC molded with CMC or coal tar only,and original AC powder. The molded AC was characterized by FT-IR,XRD and SEM,and its binding mechanism analyzed.
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