495 / 2018-09-09 10:41:30

Study on the Influencing Factors of the Dissolution of Hydrated Silicon Dioxide in Rice Husk

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Rice husk (RH) is a typical agriculture biomass which has high content of hydrated silicon dioxide. To attain high purity carbon，the present research work deals with carbonization of RH and reaction of sodium hydroxide (NaOH) and rice husk ash (RHA). The RH is firstly treated acid leaching, and then is carbonized while passing into water vapor to obtain RHA. And finally the RHA is boiled with NaOH solution to dissolution of silica. The optimum conditions are as follow: the carbonizing temperature is 500℃, the carbonizing time is 0.5h, the mass ratio of RH to steam is 1:2, the concentration of NaOH solution is 3%, the solid liquid ratio of RHA to NaOH solution is 1:20, and the boiling time is 3h. The content of silica is 15.04% in the rice husk. The RHA from carbonization contains 39.76% silicon dioxide. As for processing outcome, the removal of silica is 99.03% and more.