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公开(公告)号：US20230372892A1
公开(公告)日：2023-11-23
申请号：US17861245
申请日：2022-07-10
Applicant: ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY , POWER CHINA HUADONG ENGINEERING CORPORATION LIMITED
Inventor： Jin Zhang , Haohao Bian , Wanpeng Liu , Cheng Shen , Shengdao Shan
CPC classification number: B01J20/20 , B01J20/041 , B01J20/28009 , B01J20/3021 , B01J20/3078 , B01J20/3085 , C02F1/288 , C02F2101/105
Abstract: A one-step method for preparing a magnetic magnesium-iron layered double hydroxide (LDH)-biochar composite material and use thereof provided. Biomass, as a substrate, is placed in a ferric salt solution, magnesium hydroxide is added, the materials are fully stirred and aged for a certain time, the aged materials are dried to obtain a magnesium-iron LDH-biomass, and the magnetic magnesium-iron LDH-biochar composite material is obtained after pyrolysis. The method solves problems of uncontrollable reaction and low crystallinity of products in preparing LDH using a coprecipitation method, reduces the amount of drugs, omits a step of adjusting a pH with an alkaline solution, improves yield and reduces a cost. The obtained magnetic magnesium-iron LDH-biochar composite material exhibits an excellent performance in adsorbing phosphate in water and can be recovered by an external magnetic field. Thus, an important method is provided for preparing LDH and the composite thereof.
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公开(公告)号：US11738326B2
公开(公告)日：2023-08-29
申请号：US17919288
申请日：2020-07-16
Inventor： Shengdao Shan , Wenbiao Zhang , Haifeng Zhuang , Genxing Pan , Qiaona Xie
IPC: B01J20/20 , C05G3/40 , C05G5/40 , B01J20/28 , B01J20/30 , B01J20/32 , C02F1/28 , C05C11/00 , C05C3/00 , C02F101/10 , C02F101/16 , C02F103/20
CPC classification number: B01J20/20 , B01J20/28061 , B01J20/3021 , B01J20/3071 , B01J20/3078 , B01J20/3085 , B01J20/3204 , B01J20/3219 , B01J20/3248 , C02F1/283 , C05C3/00 , C05C11/00 , C05G3/40 , C05G5/40 , C02F2101/105 , C02F2101/16 , 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.
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公开(公告)号：US11186809B1
公开(公告)日：2021-11-30
申请号：US17072054
申请日：2020-10-16
Inventor： Shengdao Shan , Tianyong Xiang , Jingming Li , Ping Zheng , Huicai Cheng , Wu Huang , Zhirong Wang , Baolan Hu , Changai Zhang
Abstract: A high-concentration anaerobic fermentation apparatus includes a liquid accumulation tank, a fermentation vessel, a feeding assembly, and a biogas residue collecting bin. The feeding assembly includes a hopper and a return conveyor belt including a first portion extending downward from the hopper till below a liquid level, a second portion extending upward from a bottom end of the first portion till above the liquid level, a third portion extending downward from a top end of the second portion till the liquid level, and a fourth portion extending upward from a bottom end of the third portion till out of the liquid level and above the biogas residue collecting bin. A pressure-feed flange is disposed at an outer side of the fermentation vessel, a feed channel is formed between the pressure-feed flange and the first portion, and a discharge channel is formed between the pressure-feed flange and the fourth portion.
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