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Preparation method for water retention slow release fertilizer for saline and alkaline land

A slow-release fertilizer, saline-alkali land technology, applied in the direction of ammonium salt fertilizer, nitrogen fertilizer, potash fertilizer, etc., can solve the problems of soil, water system and air pollution, unreasonable application of chemical fertilizer, occupation of large land, etc., to improve mechanical properties and waterproof performance, The effect of preventing soil erosion and improving the utilization rate of fertilizers

Inactive Publication Date: 2018-11-13
安徽省舒城久富田经济发展有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional chemical fertilizers face two major problems in the process of agricultural production and use: one is the large amount of chemical fertilizers used, and the utilization rate is low. The utilization rate of nitrogen fertilizer in the current season in my country is 30-35%, the utilization rate of phosphorus fertilizer is 10-25%, and the utilization rate of potassium fertilizer is 35%. -50%; Second, the use of chemical fertilizers is unreasonable. At present, the use of quick-acting fertilizers in my country is still dominated by batches of quick-acting fertilizers, with low utilization rates, short fertilizer effect cycles, high costs, and environmental pollution.
[0005] Phosphogypsum is a by-product of the sulfuric acid extraction process of phosphoric acid production. Every ton of phosphoric acid produced will produce 4.5-5.5 tons of phosphogypsum. The large discharge of phosphogypsum not only occupies a large amount of land, but also causes damage to the soil due to the long-term soaking of phosphogypsum in rainwater. , serious pollution of water system and atmosphere

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Activation of biomass coke: place 20g of biomass coke in a sealed place at 5°C for 1 hour, then place it in an oven at 100°C to dry to constant weight, and roast it at 500°C for 1 hour to obtain activated biomass coke;

[0037] (2) Modified preparation of chitosan: put 20g of chitosan solids into the stirrer, add 10g of acetic acid solution with a mass fraction of 3%, stir until completely dissolved at 30°C; add 10g of chitosan to the acetic acid solution Toluene diisocyanate and 2g of azobisisoheptanonitrile were reacted at 75°C for 2 hours, filtered while hot, and the filter cake was washed with deionized water and absolute ethanol to remove unreacted monomers, and then dried in an oven at 100°C to constant weight. Promptly obtain modified chitosan;

[0038] (3) Preparation of slow-release fertilizer: disperse 20g of biomass coke in absolute ethanol, add 20g of modified chitosan and 4g of water-retaining agent, heat to a reflux state, heat and stir for 20min, and ...

Embodiment 2

[0044] (1) Activation of biomass coke: place 20g of biomass coke in a sealed place at 5°C for 1 hour, then place it in an oven at 100°C to dry to constant weight, and roast it at 500°C for 1 hour to obtain activated biomass coke;

[0045] (2) Modified preparation of chitosan: put 20g of chitosan solids into the stirrer, add 10g of acetic acid solution with a mass fraction of 3%, stir until completely dissolved at 30°C; add 10g of chitosan to the acetic acid solution Toluene diisocyanate and 2g of azobisisoheptanonitrile were reacted at 75°C for 2 hours, filtered while hot, and the filter cake was washed with deionized water and absolute ethanol to remove unreacted monomers, and then dried in an oven at 100°C to constant weight. Promptly obtain modified chitosan;

[0046] (3) Preparation of slow-release fertilizer: disperse 20g of biomass coke in absolute ethanol, add 20g of modified chitosan and 4g of water-retaining agent, heat to a reflux state, heat and stir for 20min, and ...

Embodiment 3

[0075] Based on Example 1, set the comparative example 1 that does not modify chitosan, the comparative example 2 that does not process the water-retaining agent with hydrogenated castor oil and epoxidized soybean oil, and the comparative example that uses polyglutamic acid as the water-retaining agent 3.

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Abstract

The invention discloses a preparation method for a water retention slow release fertilizer for a saline and alkaline land, and relates to the technical field of the slow release fertilizer. The preparation method of the slow release fertilizer includes the steps of excitation of biomass char, modified preparation of chitosan and preparation of the slow release fertilizer, wherein the chitosan is modified by diisocyanate and an initiator, so as to improve the mechanical property and the water-proof performance of the chitosan; a water-retaining agent is compounded by adopting polyglutamic acidand glycerin as raw materials, so as to avoid moisture loss in soil and improve the use efficiency of the slow release fertilizer.

Description

Technical field: [0001] The invention relates to the technical field of slow-release fertilizers, in particular to a method for preparing water-retaining slow-release fertilizers for saline-alkali soils. Background technique: [0002] my country is a large agricultural country. With the continuous development of agricultural technology, agricultural production depends more and more on chemical fertilizers. At present, the amount of chemical fertilizers used in my country ranks first in the world, and it shows a trend of increasing year by year. However, traditional chemical fertilizers face two major problems in the process of agricultural production and use: one is the large amount of chemical fertilizers used, and the utilization rate is low. The utilization rate of nitrogen fertilizer in the current season in my country is 30-35%, the utilization rate of phosphorus fertilizer is 10-25%, and the utilization rate of potassium fertilizer is 35%. -50%; Second, the use of chemi...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/04C05G3/80
CPCC05B1/02C05G3/00C05G3/80C05G5/30C05B17/00C05C3/00C05C11/00C05D1/02C05D9/00C05D9/02C05F11/02
Inventor 任其松
Owner 安徽省舒城久富田经济发展有限责任公司
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