A method and application of preparing biochar by pyrolysis of agricultural, forestry and livestock and poultry waste

Abstract

The present invention relates to the technical field of biochar, and in particular to a method and application of preparing biochar by pyrolysis of agricultural, forestry and livestock and poultry wastes. The present application discloses a method for preparing biochar by pyrolysis of agricultural, forestry and livestock and poultry wastes, comprising the following steps: S1. Collect agricultural and forestry wastes and livestock and poultry wastes separately; S2. Ball-mill the agricultural and forestry wastes and livestock and poultry wastes respectively; S3. Homogenize and mix the ball-milled agricultural and forestry wastes, ball-milled livestock and poultry wastes and composite additives to obtain a mixture; S4. Hydrothermal carbonization the mixture; S5. Filter, wash and dry the material after the hydrothermal carbonization to obtain biochar. The method described in the present application effectively solves the problems of underdeveloped pore structure and limited specific surface area in the preparation process of biochar through ball milling pretreatment, composite additives and hydrothermal carbonization, and broadens the application scope of biochar.

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