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Method for producing compound fertilizer by extrusion-kneading process

A compound fertilizer and compound fertilizer technology, which is applied in the direction of inorganic fertilizers, ammonium salt fertilizers, urea compound fertilizers, etc., can solve the problems of high replacement frequency of extrusion equipment, large one-time investment, and restrictions on popularization and application, and achieve a one-time investment And the effects of reduced floor area, reduced production energy consumption, and improved operating environment

Active Publication Date: 2015-04-22
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The disadvantages of the traditional extrusion granulation process are: the appearance of the product particles is poor (irregular, rough surface); the replacement frequency of extrusion equipment is high; the maintenance cost is high
Using the whole slurry method, the appearance of the product particles is improved, but the energy consumption is high
In particular, the product particle size of the tower cooling process is relatively small, and it is only suitable for the production of products with specific formulas, and the one-time investment of this process is relatively large, so its popularization and application are subject to certain restrictions.

Method used

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  • Method for producing compound fertilizer by extrusion-kneading process
  • Method for producing compound fertilizer by extrusion-kneading process
  • Method for producing compound fertilizer by extrusion-kneading process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] refer to figure 1 As shown in the process flow of the preparation method of the compound fertilizer in this embodiment, the method in this embodiment is to mix and humidify the basic fertilizer and filling material after batching to make a material with high moisture content and enhanced plasticity, and pass through the extrusion equipment Obtain a cylindrical material strip with a diameter of about 3.5mm, and then obtain spherical particles with a diameter of about 4.5mm through extrusion and granulation equipment. The moisture content of the material after granulation is 3% to 8%, and then the granular material is dried and cooled. Granular compound fertilizer products.

[0045] The raw material composition of entering device is as follows:

[0046] serial number

Types of basic fertilizers and fillers

Raw material addition per ton of product (kg)

1

Urea (N: 46%)

100

2

Ammonium chloride (N: 24%)

282

3

Monoammon...

Embodiment 2

[0055] The preparation method of the compound fertilizer refers to Example 1, but the composition of the raw materials used and the extrusion and granulation equipment are changed.

[0056] The composition of raw materials into the system is as follows:

[0057] serial number

Types of basic fertilizers and fillers

Raw material addition per ton of product (kg)

1

Urea (N: 46%)

384

2

Monoammonium Phosphate (N: 11%P 2 o 5 : 44%)

230

3

Potassium Chloride (K 2 O>60%)

168

4

Bentonite

242

[0058] Product specification: N-P 2 o 5 -K 2 O=20-10-10

[0059] Extrusion equipment used: screw, extrusion hole diameter 3.5mm

[0060] use Figure 4 The extrusion granulation equipment shown, the granulation aperture is 4.5mm

[0061] The moisture content of the material entering the extruder: ~4%, using a twin-shaft mixer to mix and humidify

[0062] Material temperature into the extruder: room tempe...

Embodiment 3

[0066] The preparation method of the compound fertilizer refers to Example 1, but the composition of the raw materials used and the extrusion and granulation equipment are changed.

[0067] The composition of raw materials into the system is as follows:

[0068] serial number

Types of basic fertilizers and fillers

Raw material addition per ton of product (kg)

1

Phosphorous ammonium nitrate (N: 32%P 2 o 5 : 4%)

242

2

Diammonium Phosphate (N: 18%P 2 o 5 : 46%)

242

3

Potassium sulfate (K 2 O>50%)

485

4

Attapulgite

45

[0069] Product specification: N-P 2 o 5 -K 2 O=12-12-24

[0070] Extrusion equipment used: First, the rollers are extruded into a sheet with a thickness of 3.5mm, and then cut into strips of 3.5mm×3.5mm in thickness, and the strips fall directly into the feed port of the extrusion granulator

[0071] use figure 2 Extrusion and granulation equipment shown, granulation...

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Abstract

The invention relates to a method for producing a compound fertilizer by an extrusion-kneading process, which comprises the following steps: (1) plasticizing a raw material mixture; (2) extruding the plasticized raw material mixture into strips, or pressing into sheets and cutting into strips; and (3) sending the strips into an extrusion-kneading granulation device to form compound fertilizer granules. Compared with the prior art, the product obtained by the method has the advantages of uniform granular size, smooth appearance, more accurate nutrients and improved storage quality. Compared with the traditional pellet process, the method provided by the invention further simplifies the production process, can save the steps of drying, screening, large granule crushing and the like, obviously reduces the exhaust emission, obviously improves the production shop environment and greatly lowers the comprehensive energy consumption.

Description

technical field [0001] The invention relates to a method for producing granular compound fertilizers, in particular to a method for producing granular compound fertilizers by extrusion. Background technique [0002] At present, there are roughly three common production methods of compound fertilizers: extrusion method, pellet method and slurry method. [0003] The disadvantages of the traditional extrusion granulation process are: the appearance of product particles is poor (irregular, rough surface); the replacement frequency of extrusion equipment is high; the maintenance cost is high. [0004] The aggregate production process is currently the most commonly used method for compound fertilizer production. The main processing steps of the method are: mixing of raw materials→mixing of raw materials and returned materials→drum granulation (or disk granulation)→drying→cooling→sieving→finished product. Among them, the screening process usually has 1 to 2 times the unqualified ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00
CPCC05B1/02C05B7/00C05G5/12C05C3/00C05C9/00C05D1/02C05D9/00C05B17/00
Inventor 段立松张伟
Owner SHANGHAI RES INST OF CHEM IND
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