CN112592209A - Spherical granulation method for potash magnesium sulphate fertilizer - Google Patents
Spherical granulation method for potash magnesium sulphate fertilizer Download PDFInfo
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- CN112592209A CN112592209A CN202011609990.0A CN202011609990A CN112592209A CN 112592209 A CN112592209 A CN 112592209A CN 202011609990 A CN202011609990 A CN 202011609990A CN 112592209 A CN112592209 A CN 112592209A
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- water content
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- free water
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D1/00—Fertilisers containing potassium
- C05D1/04—Fertilisers containing potassium from minerals or volcanic rocks
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/10—Solid or semi-solid fertilisers, e.g. powders
- C05G5/12—Granules or flakes
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- Geochemistry & Mineralogy (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Pest Control & Pesticides (AREA)
- Fertilizers (AREA)
Abstract
The invention discloses a method for spherical granulation of a potash magnesium sulphate fertilizer, which is implemented according to the following steps: taking refined soft potassium magnesium fertilizer with free water content of 16.32%, uniformly mixing with return material with free water content of 3.66% and crushed to particle size of less than 2mm according to the mass ratio of 7:3 to obtain a mixture with free water content of 15.1%, sequentially feeding the mixture into a spiral shaping machine for pre-shaping, granulating by a rotary drum granulator, screening and drying to obtain spherical potassium magnesium fertilizer particles, wherein the tail part of the rotary drum granulator is connected with a hot air pipe to control the discharging temperature of the granulator to be 80 ℃. The method of the invention does not need to add a crumb assistant, and avoids the introduction of ineffective components. Spherical particles with different particle diameters and good uniformity can be obtained by changing the size of the spiral pre-shaping screen in the production process, and the requirements of customers can be better met. The spherical particles have good uniformity, high molding rate and strength and small porosity.
Description
Technical Field
The invention relates to a method for spherical granulation of a potash magnesium sulphate fertilizer.
Background
In the potash fertilizer industry, there are roughly three granulation methods commonly used: extrusion, agglomeration, and spraying. 1. The spraying method is mainly used for granulating low-melting point fertilizers, has the characteristic of high forming rate, and has the defect that the product is required to have the characteristic of low melting point and is not suitable for granulating high-melting point potash fertilizers such as potassium magnesium sulfate fertilizers and the like. 2. The granulation method is the most commonly adopted method for granulating the compound fertilizer at present, and is characterized by simple equipment structure, large single-machine yield, round and smooth particle appearance and the defects of poor particle uniformity, large porosity, low particle strength and low forming rate. 3. The extrusion method has the advantages of simple process flow, large processing capacity, high particle strength and low energy consumption, and has the defects of higher requirement on a roll shaft, irregular particles, rough particle surface, poor fluidity, low forming rate, higher equipment maintenance cost, large dust in the production process, high equipment failure rate, high maintenance cost, low forming rate and irregular product appearance, and no related report of producing the potash magnesium sulphate fertilizer particles by a rotary drum granulation method at present in China.
Disclosure of Invention
The invention aims to provide a potash magnesium sulphate fertilizer spherical granulation method, and the obtained spherical granules not only have round appearance, but also have high forming rate, good uniformity and good fluidity.
The invention aims to realize the method for spherical granulation of the potash magnesium sulphate fertilizer, which is implemented according to the following steps: taking refined soft potassium magnesium fertilizer with free water content of 16.32%, uniformly mixing with return material with free water content of 3.66% and crushed to particle size of less than 2mm according to the mass ratio of 7:3 to obtain a mixture with free water content of 15.1%, sequentially feeding the mixture into a spiral shaping machine for pre-shaping, granulating by a rotary drum granulator, screening and drying to obtain spherical potassium magnesium fertilizer particles, wherein the tail part of the rotary drum granulator is connected with a hot air pipe to control the discharging temperature of the granulator to be 80 ℃.
And performing drum granulation by taking the pre-shaped particles obtained in the technical scheme as raw materials according to material characteristics. From the results of the thermodynamic studies, it is known that picromerite (K)2SO4·MgSO4·6H2O) loses two of the crystal water at the temperature of 51.6-101.8 ℃. By utilizing the characteristics of the materials, hot air is fed in a countercurrent way at the tail part of the rotary drum granulator to ensure that the temperature of the materials is 70-80 ℃, and the removed crystal water is helpful to the bonding of powder on the surface of spherical particles and the increase of the forming rate; on the other hand, the materials in the particles undergo dehydration-dissolution-recrystallization and other processes at the temperature, so that the internal stress is eliminated, and the strength of the particle product is further improved.
Compared with the prior potassium magnesium fertilizer granulation technology, the invention has the characteristics that:
(1) compared to other pellet methods: the method of the invention does not need to add a crumb assistant, and avoids the introduction of ineffective components. Spherical particles with different particle diameters and good uniformity can be obtained by changing the size of the spiral pre-shaping screen in the production process, and the requirements of customers can be better met. The spherical particles have good uniformity, high molding rate and strength and small porosity. (2) Compared with the existing extrusion granulation: the rotary drum granulation material has high molding rate, round and smooth particle appearance, good uniformity and fluidity, can be used in BB fertilizer, and widens the market of potash magnesium fertilizer products; the granule has high strength and good wear resistance, and reduces pulverization rate in the transportation process.
Drawings
The present invention will be described in further detail below with reference to the accompanying drawings.
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples. The embodiment is specifically implemented on the premise of the technical scheme of the invention, a detailed implementation mode and a specific operation process are given, and the raw materials in the embodiment are all from Limited liability company of potassium apocynum venetum (NbPo) thrown in China.
A method for spherical granulation of potash magnesium sulphate fertilizer is implemented according to the following steps: as shown in figure 1, refined soft potassium magnesium fertilizer with free water content of 16.32 percent is taken, mixed evenly with return material with particle size smaller than 2mm and free water content of 3.66 percent according to the mass ratio of 7:3 to obtain mixed material with free water content of 15.1 percent, the mixed material enters a spiral shaping machine in sequence for pre-shaping, granulating by a rotary drum granulator, screening and drying to obtain spherical potassium magnesium fertilizer particles, wherein the tail part of the rotary drum granulator is connected with a hot air pipe to control the discharging temperature of the granulator to be 80 ℃. The forming rate of the spherical potash magnesium fertilizer particles is 91%, and the average strength of the dried particles is 35.4N. The spiral shaping machine and the rotary drum granulator are both in the prior art, and the specific structure of the spiral shaping machine and the rotary drum granulator is not described in detail herein.
The invention has been explained and illustrated. The invention is not limited to the specific embodiments and methods described above, and those skilled in the art can make various modifications within the scope of the claims without affecting the spirit of the invention.
Claims (1)
1. The method for spherical granulation of the potash magnesium sulphate fertilizer is characterized by comprising the following steps of: taking refined soft potassium magnesium fertilizer with free water content of 16.32%, uniformly mixing with return material with free water content of 3.66% and crushed to particle size of less than 2mm according to the mass ratio of 7:3 to obtain a mixture with free water content of 15.1%, sequentially feeding the mixture into a spiral shaping machine for pre-shaping, granulating by a rotary drum granulator, screening and drying to obtain spherical potassium magnesium fertilizer particles, wherein the tail part of the rotary drum granulator is connected with a hot air pipe to control the discharging temperature of the granulator to be 80 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011609990.0A CN112592209A (en) | 2020-12-31 | 2020-12-31 | Spherical granulation method for potash magnesium sulphate fertilizer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011609990.0A CN112592209A (en) | 2020-12-31 | 2020-12-31 | Spherical granulation method for potash magnesium sulphate fertilizer |
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| CN112592209A true CN112592209A (en) | 2021-04-02 |
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| CN202011609990.0A Pending CN112592209A (en) | 2020-12-31 | 2020-12-31 | Spherical granulation method for potash magnesium sulphate fertilizer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115124381A (en) * | 2022-06-16 | 2022-09-30 | 国投新疆罗布泊钾盐有限责任公司 | Round-particle potassium sulfate composite material and preparation method and application thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320867A (en) * | 2011-08-31 | 2012-01-18 | 张万里 | Sulphate-potassium magnesium fertilizer and preparation method thereof |
| CN102659488A (en) * | 2012-05-10 | 2012-09-12 | 广西得盛生物科技有限公司 | High-nitrogen compound fertilizer steam-free granulating device for improvement of rotary dryer |
| CN104645879A (en) * | 2013-11-25 | 2015-05-27 | 铜陵市精品工具模具有限责任公司 | Secondary granulation machine |
| CN105272487A (en) * | 2015-09-29 | 2016-01-27 | 河北绿旺生态肥有限公司 | Multi-trace element controlled release fertilizer and preparation method thereof |
| CN205550209U (en) * | 2016-03-11 | 2016-09-07 | 河南晋开化工投资控股集团有限责任公司 | Compound fertilizer uses prilling granulator |
| CN106242646A (en) * | 2016-08-08 | 2016-12-21 | 绥芬河市石英经贸有限公司 | A kind of prilling process of circular granular potash fertilizer |
| CN107365180A (en) * | 2017-05-25 | 2017-11-21 | 滕国清 | Manufacture the production method of potassium magnesium sulfate particle and the purposes of potassium magnesium sulfate particle |
| CN107522582A (en) * | 2017-08-31 | 2017-12-29 | 梁平县丰疆生物科技有限公司 | Fertilizer granulation method |
-
2020
- 2020-12-31 CN CN202011609990.0A patent/CN112592209A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320867A (en) * | 2011-08-31 | 2012-01-18 | 张万里 | Sulphate-potassium magnesium fertilizer and preparation method thereof |
| CN102659488A (en) * | 2012-05-10 | 2012-09-12 | 广西得盛生物科技有限公司 | High-nitrogen compound fertilizer steam-free granulating device for improvement of rotary dryer |
| CN104645879A (en) * | 2013-11-25 | 2015-05-27 | 铜陵市精品工具模具有限责任公司 | Secondary granulation machine |
| CN105272487A (en) * | 2015-09-29 | 2016-01-27 | 河北绿旺生态肥有限公司 | Multi-trace element controlled release fertilizer and preparation method thereof |
| CN205550209U (en) * | 2016-03-11 | 2016-09-07 | 河南晋开化工投资控股集团有限责任公司 | Compound fertilizer uses prilling granulator |
| CN106242646A (en) * | 2016-08-08 | 2016-12-21 | 绥芬河市石英经贸有限公司 | A kind of prilling process of circular granular potash fertilizer |
| CN107365180A (en) * | 2017-05-25 | 2017-11-21 | 滕国清 | Manufacture the production method of potassium magnesium sulfate particle and the purposes of potassium magnesium sulfate particle |
| CN107522582A (en) * | 2017-08-31 | 2017-12-29 | 梁平县丰疆生物科技有限公司 | Fertilizer granulation method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115124381A (en) * | 2022-06-16 | 2022-09-30 | 国投新疆罗布泊钾盐有限责任公司 | Round-particle potassium sulfate composite material and preparation method and application thereof |
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Application publication date: 20210402 |