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Preparation method of magnesium-modified biochar-coated urea fertilizer

A technology of coating urea and biochar, which is applied in urea compound fertilizer, layered/coated fertilizer, magnesium fertilizer, etc., can solve the problems of low slow release performance and poor physical properties, and improve the slow release effect and performance. Improved, environmentally friendly performance

Active Publication Date: 2022-01-04
SHENYANG AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention modifies biochar with magnesium chloride solution, adds polyvinyl alcohol to configure coating materials, and finally prepares coated urea to solve the problems of poor physical properties and low slow-release performance of current coated fertilizers, and prolong the slow-release of fertilizers. Cycle, improve fertilizer use efficiency and reduce environmental pollution, to ensure sustainable and healthy development of agriculture

Method used

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  • Preparation method of magnesium-modified biochar-coated urea fertilizer
  • Preparation method of magnesium-modified biochar-coated urea fertilizer
  • Preparation method of magnesium-modified biochar-coated urea fertilizer

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preparation example Construction

[0030] The invention provides a kind of preparation method of magnesium-modified biochar-coated urea fertilizer, comprising the following steps:

[0031] (1) The agricultural wastes are sequentially pulverized, sieved, carbonized and cracked to obtain biochar;

[0032] (2) Grinding the biochar to obtain biochar powder, then mixing with magnesium chloride solution, stirring, filtering, washing, and drying to obtain magnesium-modified biochar;

[0033] (3) Grinding the magnesium-modified biochar to obtain magnesium-modified biochar powder, and then mixing with polyvinyl alcohol solution, a plasticizer, and a catalyst to obtain a magnesium-modified biochar coating material;

[0034] (4) Coating the magnesium-modified biochar coating material and urea to obtain the magnesium-modified biochar-coated urea fertilizer.

[0035] In the invention, the agricultural wastes are sequentially crushed, sieved, and carbonized and cracked to obtain biochar.

[0036] In the present invention, ...

Embodiment 1

[0063] The preparation method of magnesium modified biochar coated urea fertilizer comprises the following steps:

[0064] (1) Preparation of biochar

[0065] The crop stalks were crushed sequentially, passed through a 5-mesh sieve, and carbonized and cracked for 2 hours at 500°C under anaerobic conditions to obtain biochar (abbreviated as P 1 B 1 );

[0066] (2) Preparation of magnesium-modified biochar

[0067] Grind the biochar through a 200-mesh sieve to obtain biochar powder, and mix the biochar powder with the prepared 0.01mol L -1 Magnesium Chloride (MgCl 2 ·6H 2 O) the solution is mixed according to 1:50 (m:V), the bottle mouth is sealed with a plastic wrap, and a magnetic stirrer is used to vigorously stir (1800r / min) for 3h, then filter, wash, and dry to obtain magnesium-modified biochar;

[0068] (3) Preparation of magnesium-modified biochar coating material

[0069] Grinding the magnesium-modified biochar through a 200-mesh sieve to obtain magnesium-modified...

Embodiment 2

[0081] According to embodiment 1 step (1), prepare magnesium modified biochar material 1 (abbreviated as P 1 B 2 ): adopt biochar 1.2g, polyvinyl alcohol (polymerization degree 1750, degree of alcoholysis 50%) 20g, glutaraldehyde 3.3mL, acetic acid 13.3mL and 1-octanol 0.2mL to prepare magnesium modified biological As for the carbon coated material, the magnesium modified biochar coated urea fertilizer is prepared according to the step (4).

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Abstract

The invention provides a preparation method of a magnesium-modified biochar-coated urea fertilizer, belonging to the technical field of agricultural fertilizers. The preparation method of the magnesium-modified biochar-coated urea fertilizer comprises the following steps: preparing biochar; preparing magnesium modified biochar; preparing a magnesium-modified biochar coating material; and preparing the magnesium-modified biochar-coated urea fertilizer. According to the invention, the coated urea is finally prepared by modifying the biochar with a magnesium chloride solution and adding the polyvinyl alcohol to prepare the coating material, so the problems of poor physical performance, low slow release performance and the like of existing coated fertilizers are solved, the slow release period of the fertilizer is prolonged, the utilization efficiency of the fertilizer is improved, environmental pollution is reduced, and sustainable and healthy development of agriculture is ensured.

Description

technical field [0001] The invention relates to the technical field of agricultural fertilizers, in particular to a preparation method of magnesium-modified biochar-coated urea fertilizer. Background technique [0002] A major challenge in current agricultural practice is the need to increase productivity in more sustainable and environmentally friendly ways. Post-Green Revolution agricultural practices have increasingly relied on chemical fertilizers to ensure higher productivity. Chemical fertilizers do increase soil productivity, but at the same time they can also cause major ecological imbalances, such as loss of biodiversity, global warming, and heavy metal residues in organisms, which jeopardizes environmental sustainability. First of all, rapid global climate change, rapid urbanization and extensive use of agrochemicals have jointly affected crop production worldwide and created a crisis for food security; second, the reduction of fertile land has further endangered ...

Claims

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Application Information

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IPC IPC(8): C05G3/40C05G3/90C05G5/12C05G5/30C05C9/00
CPCC05C9/00C05C9/005C05G3/40C05G3/90C05G5/12C05G5/37C05G5/38C05D5/00C05D9/00Y02A40/22Y02P60/21
Inventor 杨劲峰刘明琪韩晓日崔红光王国庆刘宁李娜罗培宇刘侯俊马宇鑫王海婷李双廷崔涵孙月冯馨雨李天娇杨崇文王梓宁汪昊莹
Owner SHENYANG AGRI UNIV
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