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Preparation method for hydrothermal carbon-based sustained-release nitrogenous fertilizer

A technology of hydrothermal carbonization and hydrothermal carbonization, which is applied in the direction of nitrogen fertilizer, fertilization equipment, ammonium nitrate fertilizer, etc., and can solve problems such as disharmony, crop straw burning, and low soil fertility

Inactive Publication Date: 2017-08-22
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The development of new fertilizers is a key measure to improve the utilization rate of fertilizers. However, the current market share of new fertilizers in my country is still low, and there are still few new fertilizers with independent intellectual property rights that are suitable for my country's actual situation.
In addition, a large amount of livestock and poultry manure in intensive farms is disposed of randomly, and a large amount of crop straw is burned.
On the one hand, the soil fertility is low, and on the other hand, a large amount of waste biomass cannot be returned to the field.

Method used

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  • Preparation method for hydrothermal carbon-based sustained-release nitrogenous fertilizer
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  • Preparation method for hydrothermal carbon-based sustained-release nitrogenous fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Material preparation

[0023] The pig manure was dried and crushed to less than 5mm, and set aside. Soil value Garden of Eco-Environmental Research Center, Chinese Academy of Sciences (organic matter 15.36g / kg; CEC 7.9cmol / kg; TN 0.80g / kg; TK 20.32g / kg; TP 0.99g / kg;)

[0024] 2. Preparation of slow-release nitrogen fertilizer

[0025] 1) Mix pig manure (dry basis) with water at a ratio of 1:5 and put it into a hydrothermal reactor.

[0026] 2) Heating the reactor to 200°C and maintaining it for 60 minutes; then cooling by an electric fan and internal circulating cooling water, and then performing solid-liquid centrifugation to obtain hydrothermal charcoal;

[0027] 3) Ammonium nitrate solid is mixed with hydrothermal charcoal (hydrothermal charcoal and ammonium nitrate are mixed according to the ratio of 4:1);

[0028] 4) After mechanical stirring for 2 hours, dry in a blast dryer at 60° C. to obtain the hydrothermal charcoal-based slow-release nitrogen fertilizer...

Embodiment 2

[0047] In addition to using corn stover instead of pig manure.

[0048] In the preparation step 2) of the hydrothermal charcoal-based slow-release nitrogen fertilizer, except for the treatment at 220° C. for 80 minutes, the rest is the same as in Example 1.

[0049] The analysis results are shown in Table 1 and Table 2.

Embodiment 3

[0051] In addition to replacing pig manure with rice straw.

[0052] In the preparation steps of hydrothermal charcoal-based slow-release nitrogen fertilizer, 1) mix rice straw (dry basis) with water at a ratio of 1:5;

[0053] The analysis results are shown in Table 1 and Table 2.

[0054] Table 1. Cumulative dissolution rate of hydrothermal carbon-based slow-release nitrogen fertilizer aqueous solution.

[0055]

[0056]

[0057] Table 2. Cumulative leaching rate of nitrogen leached from hydrothermal charcoal-based slow-release nitrogen fertilizer soil column.

[0058] time ammonium nitrate Example 1 Example 2 Example 3 Cumulative dissolution rate on the second day (%) 82.7 16.2 15.2 16.8 Cumulative dissolution rate on the 4th day (%) 83.6 41.5 51.8 38.4 Cumulative dissolution rate on the 6th day (%) 84.5 59.6 62.2 55.5 Cumulative dissolution rate on the 8th day (%) 87.9 60.8 69.1 59.6 Cumulative dissolution rat...

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Abstract

The invention provides a novel preparation method for hydrothermal carbon-based sustained-release nitrogenous fertilizer prepared from waste biomass in consideration of the current situation that the utilization rate of fertilizer is low due to excess application of chemical nitrogenous fertilizer and the amount of waste biomass in China is great. The novel preparation method comprises the following steps: 1) subjecting waste biomass to hydrothermal treatment so as to convert waste biomass into hydrothermal carbon; and 2) adding a certain amount of chemical nitrogenous fertilizer into hydrothermal carbon and carrying out adequate mixing and drying successively. The hydrothermal carbon-based sustained-release nitrogenous fertilizer prepared from waste biomass in the invention can effectively delay the dissolving-out rate of elemental nitrogen of the fertilizer in soil and improves the utilization efficiency of nutrients; and the sustained-release fertilizer carrier hydrothermal carbon is prepared from waste biomass, so the fertilizer has the characteristics of environmental protection, low price, etc.

Description

technical field [0001] The invention relates to the treatment and disposal of waste biomass, which belongs to the new technology of resource utilization of solid waste in the field of environmental protection and comprehensive utilization of resources, and is especially suitable for the high added value of waste biomass such as straw, livestock and poultry manure, kitchen waste, etc. resource utilization. Background technique [0002] It took my country 28 years to increase the total grain output from 304.8 billion kilograms in 1978 to more than 490 billion kilograms in 2006, but at the same time, the national chemical fertilizer consumption has increased by more than 4 times, and the chemical fertilizer application per unit area is 151% of that of France. %, 159% of Germany, and 329% of the United States, while the yield per unit area is only 70-90% of those of these countries. It is not difficult to see that the existing methods of growing food crops not only have high pro...

Claims

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Application Information

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IPC IPC(8): C05G3/00
CPCC05C1/00C05G3/00C05D9/00
Inventor 刘振刚盖超
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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