公开(公告)号：US20230148315A1

公开(公告)日：2023-05-11

申请号：US17919288

申请日：2020-07-16

Applicant: ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Shengdao SHAN ,  Haifeng ZHUANG ,  Genxing PAN ,  Qiaona XIE

IPC: B01J20/20 ,  B01J20/30 ,  B01J20/32 ,  B01J20/28 ,  C05G3/40 ,  C05C11/00 ,  C05G5/40 ,  C02F1/28

CPC classification number: B01J20/20 ,  B01J20/3021 ,  B01J20/3071 ,  B01J20/3085 ,  B01J20/3078 ,  B01J20/3219 ,  B01J20/3248 ,  B01J20/3204 ,  B01J20/28061 ,  C05G3/40 ,  C05C11/00 ,  C05G5/40 ,  C02F1/283 ,  C02F2103/20

Abstract: A preparation method of charcoal-based fertilizer is provided. Particularly, a special pig manure charcoal modified by amino grafting, a preparation method thereof, and its application in the reuse of nitrogen from farmland drainage are provided. The preparation method includes the following steps: 1) drying raw pig manure to a moisture content of 80%-85% and carrying out pickling, drying, and crushing successively to obtain a dried pig manure powder; 2) conducting liquid nitrogen pretreatment and high-temperature charcoalization to obtain an expanded pig manure charcoal; 3) performing carboxylation treatment to obtain a carboxylated pig manure charcoal; 4) amino grafting: adding an ammonia liquor to the carboxylated pig manure charcoal obtained in step 3), stirring for 20-24 h in an oil bath at 200-240° C.; washing and filtering; and drying and grinding to obtain the special pig manure charcoal modified by amino grafting.