A method for preparing activated carbon from waste residue of Chinese medicinal materials
A technology for preparing activated carbon and Chinese medicinal materials, applied in the field of resource utilization of Chinese medicinal material waste residues, can solve the problems of poor impregnation effect of chemical activators, affecting the performance of activated carbon, increasing production costs, etc., so as to shorten the preparation period, accelerate the decomposition, and promote rapid release effect
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Embodiment 1
[0039]Heat the waste slag of traditional Chinese medicinal materials with a moisture content of 75wt% (mass fraction) and a particle size within 15mm in a closed heating furnace for physical activation once, and heat up to 750°C at 50°C / min for a physical activation time of 40min. During the activation process, stirring was continued at a stirring speed of 3 r / min to obtain the primary activated carbon material. The activated carbon raw material was impregnated with potassium carbonate solution with a mass fraction of 50%, the impregnation ratio (mass ratio of activated carbon to chemical activator) was 1:2.0, and the impregnation time was 8h. Place the impregnated material in the activation furnace, under nitrogen atmosphere, heat up at a rate of 30°C / min to the activation temperature of 800°C, and perform secondary chemical activation for 15 minutes to obtain activated carbon semi-finished products. After repeated washing and drying, activated carbon products are obtained. T...
Embodiment 2
[0041] Heat the waste slag of traditional Chinese medicinal materials with a moisture content of 65wt% and a particle size within 15mm in a closed heating furnace for a physical activation. The temperature is raised to 750°C at 50°C / min, and the physical activation time is 40min. The physical activation process takes 4r / min stirring speed and continuous stirring to prepare the initial activated carbon material. The activated carbon raw material was impregnated with potassium carbonate solution with a mass fraction of 60%, the impregnation ratio (mass ratio of activated carbon to chemical activator) was 1:1.7, and the impregnation time was 7h. The impregnated material was placed in the activation furnace, under the helium atmosphere, the activated carbon was prepared under the condition of heating rate of 20 °C / min to the activation temperature of 800 °C, and the activation time of 20 min. The yield of activated carbon is 36.51%, and the morphology of the prepared activated ca...
Embodiment 3
[0043] Heat the waste slag of traditional Chinese medicinal materials with a moisture content of 80wt% and a particle size within 15mm in a closed heating furnace for a physical activation. The temperature is raised to 850°C at 80°C / min, and the physical activation time is 60min. The physical activation process takes 5r / min stirring speed and continuous stirring to prepare the initial activated carbon material. The activated carbon raw material was impregnated with potassium carbonate solution with a mass fraction of 40%, the impregnation ratio (mass ratio of activated carbon to chemical activator) was 1:2.5, and the impregnation time was 7h. The impregnated material was placed in the activation furnace, under the argon atmosphere, the activation temperature was raised to 750 °C at a heating rate of 10 °C / min, and the activation time was 30 min to prepare activated carbon. The yield of activated carbon was 33.12%. The nitrogen adsorption-desorption isotherm curve of the gac p...
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