Nutrient released modle of compound controlled releasing and production thereof

A production method and technology of compound fertilizer, which are applied in fertilization device, fertilizer mixture, application and other directions, can solve the problems of complex impurity composition, difficult control and high production cost, and achieve the effects of simple operation, wide selection range and low cost

Inactive Publication Date: 2005-07-27
周端午
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main defect of the above method is that the conventional finished fertilizer is processed through physical mixing, the impurity components are complex, difficult to control, and the production cost is high
[0017] The compound fertilizers produced by the above-mentioned sulfur-based method and urea-based method do not have slow-release / controlled-release functions, and when producing high-concentration compound fertilizers, due to their own process limitations, the nutrient adjustment range is narrow, and it is difficult to produce nutrients according to the physiological requirements of crops. Highly Concentrated Formula of Elements
The nitrogen in sulfur-based products is mainly ammonium sulfate, so when producing high-concentration fertilizers, it is difficult to add trace elements and other functional ingredients that promote crop growth to the formula

Method used

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  • Nutrient released modle of compound controlled releasing and production thereof
  • Nutrient released modle of compound controlled releasing and production thereof
  • Nutrient released modle of compound controlled releasing and production thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0073] Put 165kg of 98% sulfuric acid in a 300L reactor with jacket heating and stirring, preheat to about 85°C, and add powder potassium chloride (K 2 (2≥60%) 125kg, in the reaction process, the hydrochloric acid that water jet pump circulation suction reaction process produces, maintains 115~125 ℃ of reaction temperature, reacts 60~90min, obtains potassium bisulfate feed liquid.

[0074] 317kg of 50% phosphoric acid was placed in a 500L thin-layer reaction kettle heated and stirred with a jacket, and powder potassium chloride (K 2 O≥60%) 125kg, during the reaction process, the hydrogen chloride produced in the reaction process is circulated by the water jet pump, the reaction temperature is maintained at 95~125°C, the pressure is -0.6~-0.8Mpa, the reaction is 60min, and the phosphoric acid with a water content of 5~8% is obtained Potassium dihydrogen liquid.

[0075] Put 217 kg of potassium hydrogen sulfate and potassium dihydrogen phosphate obtained from the reaction into ...

Embodiment 2

[0081] Embodiment two (high nitrogen type N: P 2 o 5 : K 2 O=25:10:10)

[0082] Place 111kg of 98% sulfuric acid in a 300L jacketed heating and stirring reactor, preheat to about 85°C, and add powder potassium chloride (K 2 (2≥60%) 84kg, in the reaction process, the hydrochloric acid that water injection pump circulation suction reaction process produces, maintains 115~125 ℃ of reaction temperature, reacts 60~90 minutes, obtains potassium bisulfate feed liquid.

[0083] With 50% phosphoric acid 213kg, place in the thin-layer reactor of 300L band jacket heating and stirring, add powder potassium chloride (K 2 (O≥60%) 84kg, in the reaction process, the hydrochloric acid that the hydrojet pump circulation suction reaction process produces, maintains reaction temperature 95~110 ​​℃, pressure-0.6~-0.8Mpa, reacts for 60 minutes, obtains water content 5~8% Potassium dihydrogen phosphate liquid.

[0084] Put the potassium hydrogen sulfate and potassium dihydrogen phosphate obtain...

Embodiment 3

[0085] Embodiment three (high potassium type N: P 2 o 5 : K 2 O=15:10:20)

[0086] Put 280kg of 50% phosphoric acid in a 200L jacketed thin-layer reactor for heating and stirring, add 86kg of molten urea while stirring, maintain the reaction temperature at 95-110°C, and react for 40 minutes to obtain phosphoric acid with a water content of 8-15%. urea.

[0087] Potassium chloride powder (K 2 (0≥60%) 334kg is added to 1200L melting and complexing reactor, is mixed with the melting urea (241kg) that is added with complexing accelerator in the reactor and co-melts, and then the urea phosphate that above-mentioned reaction obtains is pumped in, promotes in complexing Partially generate the translucent mixed slurry of urea complex under the action of the agent, then add the slurry fluidity improver (15kg), trace elements 107kg, and functional additive 94kg. Prepared to contain N:P 2 o 5 : K 2 O=15:10:20, mixed molten slurry containing about 5-8% water. Then add 40kg of ske...

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Abstract

A controlling and releasing composite fertilizer nutrient releasing model and production are disclosed. The production is carried out by potassium chloride reacting with phosphoric acid and concentrated sulfuric acid, recovering hydrogen chloride, two products reacting, adding urine to obtain mixed slurry of potassium sulfate and urea phosphate, adding stabilizer and flowing-performance improver, reacting with urea to obtain ammonium phosphate mixing melt in melting boiler, regulating NPK proportion, adding functional additive, combing releasing mechanism with instant releasing, frame slow releasing and surface controllable releasing, granulating, coating, computing fertilizer proportion, and obtaining controllable releasing composite fertilizer. Its advantages include low cost, regulating releasing period and no environmental pollution.

Description

technical field [0001] The invention relates to a nutrient release model and a production method of a controlled-release compound fertilizer. More specifically, the release rate of the nutrients of the adjustable slow-release fertilizer involved in the present invention adopts different release mechanisms, and three basic release models are quick-acting release, skeleton slow-release and surface-controlled release, and these three models constitute an independent The release system or combined release system coats the formula fertilizers of each growth stage separately, and then mixes them according to the nutrient ratio required by each growth stage, which can control the release of nutrients within a certain period of time at a speed relative to the nutrients required by the crops, and form Granular compound fertilizer. The invention also relates to a chemical production method with clean production, wide adjustment range and large operating flexibility. Background techni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00C05G3/00
Inventor 周端午
Owner 周端午
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