Bentonite lamella bridging cladded type slow release composite fertilizer and its preparation method

A technology of compound fertilizer and bentonite, applied in the direction of inorganic fertilizer, ammonium salt fertilizer, fertilizer mixture, etc., can solve the problems of low dosage, underutilization of bentonite structural characteristics and various properties, ineffective improvement of chemical structure and performance Processing and other issues to achieve the effect of improving soil, easy fertilization operation, and increasing application value

Inactive Publication Date: 2007-01-31
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Based on the above analysis, it can be seen that in the past technologies, whether it is from granulation technology or wrapped fertilizer technology, bentonite has not been transformed into the main coating material, its chemical structure and performance have not been effectively improved and processed, and the dosage is also low. The structural properties and various properties of bentonite have not been fully utilized

Method used

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  • Bentonite lamella bridging cladded type slow release composite fertilizer and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] (1) Pulverize 12kg of potassium chloride, 18kg of ammonium dihydrogen phosphate, 2kg of ammonium bicarbonate, 8kg of ammonium chloride, and 8kg of urea and mix evenly, then add 2kg of gypsum and 36.4kg of bentonite (sodium-based bentonite in Lin'an, Zhejiang), and continue Crush and mix well.

[0065] (2) (2) 15.6kg of bentonite is ground into powder to reach a 200-mesh sieve. Bentonite powder was added into 156kg water, stirred to form a suspension, and then 8.8kg bridging agent (CH 3 O) 3 Si-(CH 2 ) 6 -Si-(OCH 3 ) 3 Add, stir evenly, spray the suspension on the surface of the raw material obtained in step (1), age, the bridging agent reacts with the montmorillonite sheet to form a coating, which is all coated on the surface of the urea or nitrogen, phosphorus and potassium fertilizer particles .

[0066] (3) The above mixture is granulated to obtain a coated slow-release fertilizer. Nitrogen (N%), Phosphorus (P 2 o 5 %), Potassium (K 2 (2%) nutrient ratio i...

Embodiment 2

[0068] (1) Pulverize and mix 21kg of potassium chloride, 29kg of ammonium dihydrogen phosphate, 3kg of ammonium bicarbonate, 13kg of ammonium chloride, and 13kg of urea, and then add 3kg of gypsum and 14kg of bentonite, and continue to pulverize and mix evenly.

[0069] (2) Grind 6kg of bentonite into powder to pass through a 200-mesh sieve. Add bentonite powder to 60Kg of ethanol, stir to form a suspension, then add 6kg of bridging agent orthosilicate ethyl ester, stir evenly, spray the suspension on the surface of the raw material obtained in step (1), age, bridging agent It reacts with montmorillonite sheets to form a coating, which is all coated on the surface of urea or NPK fertilizer particles.

[0070] (3) The above mixture is granulated to obtain a coated slow-release fertilizer. Nitrogen (N%), Phosphorus (P 2 o 5 %), Potassium (K 2 (0%) nutrient ratio is approximately 13:13:13 (excluding bridging agent and solvent quality).

Embodiment 3

[0072] (1) Pulverize and mix 6kg of potassium chloride, 9kg of ammonium dihydrogen phosphate, 1kg of ammonium bicarbonate, 4kg of ammonium chloride, and 4kg of urea, and then add 1kg of gypsum and 60.8kg of bentonite, and continue to pulverize and mix evenly.

[0073] (2) Grind 15.2kg of bentonite into powder to pass through a 200-mesh sieve. Add bentonite powder into 76kg of ethanol and water (weight ratio: 3: 4) mixed solution, stir to form a suspension, and then 3.04kg of bridging agent (C 2 h 5 O) 3 Si-(CH 2 ) 3 -Si-NH 3 + Cl - Add, stir evenly, spray the suspension on the surface of the raw material in (1), age, the bridging agent reacts with the montmorillonite sheets to form a coating, which is completely coated on the surface of the urea or nitrogen, phosphorus and potassium fertilizer particles.

[0074] (3) The above mixture is granulated to obtain a coated slow-release fertilizer. Nitrogen (N%), Phosphorus (P 2 o 5 %), Potassium (K 2 (0%) nutrient ratio i...

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Abstract

The present invention relates to a kind of bentonite flake layer bridged covered type slowly-released composite fertilizer and its preparation method. It is characterized by that it adopts a bridging agent to make chemical reaction and can make the montmorillonite (which is an effective component in bentonite) flake structure be bridged so as to raise the use level of the bentonite and make the bentonite be come covering slowly-releasing material of said composite fertilizer. Said fertilizer can be extensively used in the field of crops, gardening and greensward, etc.

Description

(1) Technical field [0001] The invention relates to a bentonite lamellar bridging coating type slow-release compound fertilizer and a preparation method thereof. The invention adopts a bridging agent to carry out chemical reaction to bridge the lamellar structure of montmorillonite (the active ingredient in bentonite), so that bentonite becomes a coated slow-release material for compound fertilizer, and belongs to the field of slow-release fertilizer technology and bentonite mineral application. (2) Background technology [0002] A large number of chemical fertilizers are water-soluble compounds that are easily lost after being applied to the soil. According to statistics, under general conditions, in the seasonal utilization rate of soluble fertilizers, nitrogen is about 30-35%, phosphorus is about 10-25%, and potassium is 35-50%. The low utilization rate of traditional chemical fertilizers not only causes waste, but also seriously pollutes the environment, destroys soil q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G1/00C05G3/08C05D1/02C05B7/00C05C3/00C05G3/90
Inventor 周春晖范永仙俞卫华李小年葛忠华
Owner ZHEJIANG UNIV OF TECH
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