Water-retention and slow-release fertilizer based on coal gangue micron-grade hollow sphere and preparation method of fertilizer

A technology of coal gangue and hollow balls, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of uneven solid-state cross-linking reaction, low interface bonding strength, fast release speed, etc., and achieve high strength, uniform shell structure, The effect of improving water absorption capacity

Inactive Publication Date: 2014-02-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese invention patent (Application No. 200910006123.5) discloses the use of amino resin-expanded graphite composite as the coating material. Although this method will reduce secondary pollution, the interface between organic and inorganic has low bonding strength, is easy to break, and has a relatively low slow-release effect. Difference
Chinese invention patent (application number 201010229434.0) uses calcium chloride to cross-link seaweed yogurt, but due to its uneven solid-state cross-linking reaction, the initial release rate will be too fast

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Preparation of slow-release urea fertilizer based on coal gangue hollow spheres

[0027] First, dissolve 100g of urea in 100mL of water, then add 100g of coal gangue hollow balls and stir evenly. The characteristics of this coal gangue hollow ball are: bulk density 300kg / m 3 , the particle size is between 10-60μm, and the surface pore size is 2-50nm. Pour the mixture into a vacuum filter bottle, then vacuumize, and stabilize the vacuum at a pressure of 0.1 MPa for 15 minutes, then stop vacuuming, so that the urea solution can be sucked into the hollow cavity of the gangue hollow ball as much as possible, and dried Finally, it becomes the finished product of slow-release urea fertilizer. The release period of the prepared slow-release urea based on coal gangue hollow spheres of the present invention is 15 days, and the water retention rate is 32%.

Embodiment 2

[0028] Embodiment 2: preparation is based on the slow release urea fertilizer of coal gangue hollow sphere

[0029] First prepare 100mL of 0.2% starch grafted polyacrylic acid solution, dissolve 100g of urea in this solution, then add 100g of coal gangue hollow balls and stir well. The characteristics of this coal gangue hollow ball are: bulk density 600kg / m 3 , the particle size is between 80-120 μm, and the surface pore size is 1 μm. Pour this mixture into the fertilizer solution and load the fertilizer by dipping. After drying, it becomes the primary product of slow-release urea fertilizer. Prepare a solution containing cellulose (mass fraction 0.3%) and paraffin colloid (0.4%), and then spray it on the surface of coal gangue hollow spheres by high-pressure spraying until the quality of the formed organic film layer reaches the quality of the final slow-release urea product. 1%. The release period of the prepared slow-release urea based on coal gangue hollow spheres of ...

Embodiment 3

[0030] Example 3: Preparation of slow-release urea fertilizer based on coal gangue hollow spheres

[0031] Firstly, 100 g of superabsorbent resin solution grafted with 0.1 wt % cellulose was prepared, 100 g of urea was added thereto, and stirred to form a homogeneous solution. The characteristics of this coal gangue hollow ball are: bulk density 300kg / m 3 , the particle size is between 10-60μm, and the surface pore size is below 60nm. Pour this mixture into a vacuum filter bottle, then vacuumize, stabilize the vacuum at a pressure of 0.1 MPa for 15 minutes, and then stop the vacuum, so that the urea solution can be sucked into the hollow cavity of the gangue hollow ball as much as possible, and after drying Become the first product of slow-release urea fertilizer. Prepare the alginate solution, and then spray it on the surface of the coal gangue hollow sphere by high-pressure spraying until the quality of the formed organic film layer reaches 10% of the final mass of the fin...

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Abstract

The invention discloses water-retention and slow-release fertilizer based on a coal gangue micron-grade hollow sphere and a preparation method of the fertilizer. The novel water-retention and slow-release fertilizer based on the coal gangue micron-grade hollow sphere consists of a coal gangue hollow sphere shell layer and a fertilizer core layer, wherein the shell layer is a coal gangue micron-grade hollow sphere or a coal gangue micron-grade hollow sphere coated with an organic coating material on the surface, and the core layer consists of a fertilizer material or a composite material simultaneously containing organic fertilizer and a water-retention material. The material of the core layer is dissolved in water, and is loaded in a hollow cavity of the coal gangue hollow sphere through vacuum, ultrasonic or pressurized impregnation; and the organic coating material covers the coal gangue hollow sphere to seal a shell porous structure, so as to enhance a slow-release effect. The water-retention and slow-release fertilizer disclosed by the invention obviously enhances slow-release performance of the fertilizer, improves utilization rate of the fertilizer and makes full use of solid waste coal gangue, and has relatively strong water-absorption and water-retention properties; and the fertilizer is low in cost, simple in process and environment-friendly and has wide application prospect.

Description

technical field [0001] The invention relates to the field of slow-release chemical fertilizers, in particular to an organic-inorganic composite material used as a water-retaining slow-release fertilizer slow-release material and a preparation method thereof. Background technique [0002] With the rapid increase of population and the reduction of cultivated land, the stable growth of agricultural production is the primary condition to ensure the stable and sustainable development of our country. The use of chemical fertilizers is the fastest and most commonly used measure to increase food production, and more than 55% of food growth in developing countries still depends on chemical fertilizer inputs. However, due to reasons such as leaching, decomposition or volatilization, the utilization rate of conventional chemical fertilizers is low. Fertilizers that are not used by crops not only damage the soil structure, but also pollute groundwater through infiltration. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 杨金龙齐飞徐星星许杰苏振国王亚利
Owner TSINGHUA UNIV
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