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Lignin-bound biochar coated urea and preparation method thereof

A technology of coated urea and biochar, which is applied in the direction of urea compound fertilizer, fertilizer mixture, layered/coated fertilizer, etc., can solve the problems of increasing the cost of fertilization operations, high fertilizer loss and waste, and low fertilizer utilization efficiency, and achieves enhanced The effects of water retention, heat preservation, fertilizer retention and ventilation capacity, light environmental pollution, and low production cost

Inactive Publication Date: 2015-05-20
NORTHEAST AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the extensive use of chemical fertilizers not only causes environmental pollution, but also has low utilization efficiency of chemical fertilizers and a lot of waste of chemical fertilizers, which increases the cost of fertilization operations. Taking urea as an example, its utilization rate is only 30-60%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Dissolve 10 kg of acid-precipitated lignin in 90 kg of wood vinegar, vibrate and mix to obtain a binder; put the urea granules that have passed through a 24-mesh sieve into granulation equipment, and granulate the binder Spray evenly on the surface of urea, and at the same time add pyrolyzed biochar that has passed through a 48-mesh sieve after crushing, this process continues until the binder is added, and the lignin-bonded biochar-coated urea intermediate product is obtained, which is granulated The finished lignin-bonded biochar-coated urea intermediate product was dried at 45° C. to a constant weight to obtain a lignin-bonded biochar-coated urea product.

Embodiment 2

[0010] Dissolve 15 kilograms of acid-precipitated lignin in 30 kilograms of wood vinegar and 55 kilograms of water, shake and mix to obtain a binder; put urea particles that have passed through a 24-mesh sieve into granulation equipment, Spray the binder evenly on the surface of urea, and at the same time add pyrolyzed biochar that has passed through a 48-mesh sieve after crushing, and this process continues until the binder is added to obtain an intermediate product of lignin-bonded biochar-coated urea , drying the granulated lignin-bonded biochar-coated urea intermediate product at 60° C. to constant weight to obtain a lignin-bonded biochar-coated urea product.

[0011] A large number of scientific research experiments have proved that the present invention has obvious and outstanding technical effects: 1. The utilization rate of nitrogen fertilizer is improved: the application of lignin-bonded biochar-coated urea is compared with the application amount of the same urea, and ...

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Abstract

The invention relates to lignin-bound biochar coated urea and a preparation method thereof and belongs to the technical field of utilization of agricultural biomass. A binder used in the lignin-bound biochar coated urea comprises acid-precipitated lignin, a pyroligneous liquid and water in different weight ratios. The preparation method comprises the following steps of dissolving acid-precipitated lignin in a pyroligneous liquid or a pyroligneous liquid and water to obtain the binder; and granulating, spraying and drying to obtain the lignin-bound biochar coated urea finished product. The binder is novel in components and environment-friendly; the preparation method is reasonable and simple, the preparation process is simple and feasible, low in production cost; and the urea has the advantages of high fertilizer utilization rate, long fertilizer effect time, light environmental pollution and good antibacterial effect, and the soil structure is improved.

Description

technical field [0001] The invention belongs to agricultural biomass utilization technology, and mainly relates to lignin-bonded biochar-coated urea and a preparation method. Background technique [0002] my country is a large agricultural country with a large population, and food security is related to national economy, people's livelihood and social security and stability. Due to my country's plundering development and utilization of land, the problem of cultivated land is relatively prominent, mainly manifested in problems such as a large number of low- and medium-yield cultivated land, a decline in the quality of cultivated land, and soil pollution. It is urgent to protect the quality of the land. At present, the straw returning technology advocated by the state has achieved good results in many areas. However, in the northern region, especially in the Northeast, it is difficult to fully promote the straw returning technology. The main reason is that the low temperature ...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/02C05G3/04C05G3/60C05G3/80
CPCC05C9/00C05G3/60C05G3/80C05G3/90C05G5/30
Inventor 秦丽元蒋恩臣王秋静罗立娜赵晨希卢爽贾月雯高忠志
Owner NORTHEAST AGRICULTURAL UNIVERSITY
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