| In order to make full use of rice husk and minimize the pollution, a more environment-friendly way for rice husk ash utilizing must be improved. The production of activated carbon and sodium silicate from low carbon rice hush ash was improved in the present paper, The characteristics and the optimum processing procedure of this processing were also discussed in this paper.Firstly, the composition of low carbon rice husk ash was studied. The sodium silicate was extracted from low carbon rice husk ash by alkaline extraction. The relationship between NaOH concentration and extraction rate of silica was studied. The concentration of 2.0mol/L was finally chosen. Then the filtrate residue was activated by kinds of activating reagents, NaOH was chosen after comparing. After that, the optimum processing procedure of this activating processing were also discussed, The optimum conditions were as follows: temperature 640℃,activating time 120min, reagent amount 28g/8g filtrate residue. The activated carbon has the MB adsorptive value of 26mL/0.1g and ash content of 1.2%. all other characters fulfill the LY/T 1281-1998.Secondly, the characteristics of the activated carbon was studied. The present paper also discussed how other factors work on the processing, including activating reagent recycling and so on.Last, because of the cost of activation procession, utility of filtrate residue was studied after the acidification(ARHA). The characteristics and the optimum procedure of this processing were also discussed, The optimum conditions were as follows: temperature 25℃,acidification time 40min, sulphuric acid concentration 15%(v/v). the effect of ARHA was compared with floridin wich is commenly used in the oil processing industry, the results shows that RHA has slightly heightened Decolorization rate and higher oil-traping rate. And all those lead to the conclusion that the floridin was replaceable by ARHA, which is also low costing and more environment-friendly . |
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