Preparation method of loess-based geopolymer composite slow-release fertilizer

A technology of geopolymer and slow-release fertilizer, applied in urea compound fertilizer, fertilizer mixture, solid/semi-solid fertilizer, etc., can solve the problems of complex process, high cost, single function, etc., to protect the ecological environment and achieve good slow-release Performance, solve the effect of a single function

Active Publication Date: 2021-04-06
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a series of new slow-release fertilizer products have been developed successively: such as coated urea, adhesive fertilizer, hydrophilic polymer fertilizer, waste plastic film-coated fertilizer, biomass-coated fertilizer (CN 107473805 A), High polymer slow-release soil improvement material (CN 105439682 A), but the above slow-release fertilizers still have many deficiencies: high production cost, complex process, relatively single variety and function, high price, unable to be widely promoted, slow-control Unstable release performance or slow and controlled release materials are difficult to biodegrade in soil, which limits the popularization and application of slow and controlled release fertilizers
However, at present, the preparation of geopolymer materials is mainly based on clay (such as: kaolin), which has high cost, single function and narrow application range.

Method used

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  • Preparation method of loess-based geopolymer composite slow-release fertilizer
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  • Preparation method of loess-based geopolymer composite slow-release fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1 A preparation method of a loess-based geopolymer composite slow-release fertilizer:

[0056] 【Preparation of loess-based open-pore geopolymer】

[0057] First, the loess was passed through a 300-mesh sieve and dried to prepare 65.0 g of the reaction. Next, in 50 mL of distilled water, slowly add 18.000 g of silicate solid under magnetic stirring, and continue stirring (400 r / min) for 5 min to obtain a colorless solution. Add 2.000 g base activator KOH solid, adjust the rotation speed to 800 r / min and continue stirring until dissolved. Thirdly, add 65.0 g of prepared loess, stir overnight at room temperature for 12 h, add 1.800 g of surfactant, increase the speed to 1000 r / min, and stir for 15 min. Add 2.4 mL foaming agent aluminum powder solution (30%) dropwise, slow down the amount of foaming by controlling the dropping speed, and then continue to stir for 10 min to form a uniform cloudy solution. Finally, pour into the mold and dry in an oven at 80 °C for ...

Embodiment 2

[0061] Example 2 A preparation method of a loess-based geopolymer composite slow-release fertilizer:

[0062] 【Preparation of loess-based geopolymer】

[0063] First, the loess was passed through a 300-mesh sieve and dried to prepare 50.0 g of the reaction. Next, slowly add 15.000 g of sodium silicate (Na 2 SiO 3 9H 2 O) solid, then continue stirring (400 r / min) for 5 min to obtain a colorless solution. Add 2.500 g of base activator NaOH solid, adjust the rotation speed to 800 r / min and continue stirring until dissolved. Third, add 50.0 g of loess prepared and stir overnight at room temperature for 16 h. Add 1.600 g cardamom oil, increase the speed to 1000r / min, and stir for 10-20 min. Add 3.8 mL of foaming agent H dropwise 2 o 2 solution (30%), slow down the amount of foaming by controlling the drop rate, and then continue to stir for 10 min to form a uniform turbid solution. Finally, it was poured into the mold and dried in an oven at 80°C for 36 hours to obtain a lo...

Embodiment 3

[0067] Example 3 A preparation method of a loess-based geopolymer composite slow-release fertilizer:

[0068] 【Preparation of loess-based geopolymer】

[0069] First, the loess was passed through a 300-mesh sieve and dried to prepare 50.0 g of the reaction. Next, in 50 mL of distilled water, slowly add 18.000 g of potassium silicate solid under magnetic stirring, and then continue stirring (400 r / min) for 5 min to obtain a colorless solution. Add 1.300 g of base activator NaOH solid, adjust the rotation speed to 800 r / min and continue stirring until dissolved. Third, add 50.0 g of loess prepared and stir overnight at room temperature for 18 h. Add 1.400 g soybean oil, increase the speed to 1000 r / min, and stir for 10-20 minutes. Add 2.8 mL of foaming agent H dropwise 2 o 2 solution (25%), the amount of foaming was slowed down by controlling the dropping speed, and then continued to stir for 10 min to form a uniform turbid solution. Finally, it was poured into the mold and...

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Abstract

The invention relates to a preparation method of a loess-based geopolymer composite slow-release fertilizer. The method comprises the following steps: firstly, activating loess by alkali to polymerize to obtain a loess-based perforated geopolymer; adding the loess-based perforated geopolymer into a polyhydroxy polymer aqueous solution, stirring, adding a nitrogen fertilizer, continuously sealing and stirring for 0.5-2h, and adding a cross-linking agent solution to react for 3-5 min to obtain a jelly; and injecting the jelly into a gel mold, and drying at 60 DEG C for 36 hours to obtain the loess-based geopolymer composite slow-release fertilizer. The preparation method is simple in process and low in cost, the prepared loess-based geopolymer composite slow-release fertilizer not only has good slow-release performance, but also has certain water absorption and retention performance, a thought and a novel slow-release fertilizer synthesis method are provided for chemical and agricultural transboundary application, and the loess-based geopolymer composite slow-release fertilizer has high practicability and generalization performance.

Description

technical field [0001] The invention relates to the field of agricultural materials and the field of composite material science and technology, in particular to a preparation method of a loess-based geopolymer composite slow-release fertilizer. Background technique [0002] At present, my country's agricultural production is heavily dependent on chemical fertilizers, but the overall utilization rate of nitrogen fertilizers is only 30% to 35%, the other 30% is lost by leaching, volatilization, surface runoff, etc., and about 30% is consumed by microbial decomposition. Excess fertilizer will be wasted, resulting in low utilization rate of fertilizer, especially the problem of serious loss when nitrogen fertilizer is utilized. The low utilization rate of fertilizers not only directly causes losses to the economy, but also the lost fertilizers often enter the soil and water bodies, causing problems such as surface eutrophication and serious pollution of groundwater. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/40C05G5/18C05G5/12C05G3/80C05C9/00C04B28/00C04B38/02C04B38/10
CPCC05G3/00C05G3/40C05G5/18C05G5/12C05G3/80C05C9/00C04B28/006C04B38/02C04B38/10C04B14/045C04B22/062C04B2103/40C04B22/04C04B22/0013C04B24/2623C04B24/38C04B24/126C04B24/383C04B24/124Y02P60/21
Inventor 何玉凤闫海彦景星月朱新花戴锋利王荣民
Owner NORTHWEST NORMAL UNIVERSITY
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