CN113603558A - Granulation method for increasing wet strength of round granular potash fertilizer - Google Patents
Granulation method for increasing wet strength of round granular potash fertilizer Download PDFInfo
- Publication number
- CN113603558A CN113603558A CN202110819376.5A CN202110819376A CN113603558A CN 113603558 A CN113603558 A CN 113603558A CN 202110819376 A CN202110819376 A CN 202110819376A CN 113603558 A CN113603558 A CN 113603558A
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- China
- Prior art keywords
- granulation
- potash fertilizer
- fertilizer
- potassium
- wet strength
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Classifications
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B17/00—Other phosphatic fertilisers, e.g. soft rock phosphates, bone meal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/12—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic in rotating drums
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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
- C05D1/02—Manufacture from potassium chloride or sulfate or double or mixed salts thereof
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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
-
- 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
- C05G5/30—Layered or coated, e.g. dust-preventing coatings
Abstract
The invention provides a granulation method for increasing the wet strength of round granular potash fertilizer, which is characterized by comprising the following steps of: (1) putting the potash fertilizer in a raw material bin; (2) placing the auxiliary materials in an auxiliary material bin; (3) adding the raw materials and the auxiliary materials into a ball mill according to a certain proportion, and grinding for 10-30min by a ball mill; (4) placing the acidic granulation auxiliary agent aqueous solution in a granulation auxiliary agent storage tank; (5) adding the ground potash fertilizer powder into a granulation auxiliary agent aqueous solution through a disc or a roller for granulation; (6) and drying, screening and packaging the granulated potash fertilizer. The invention has the following advantages: the round particle potash fertilizer prepared by the method can increase the particle strength of wet particles during granulation, effectively improve the particle yield and greatly reduce the drying energy consumption during drying.
Description
Technical Field
The invention relates to a granulation method for increasing the wet strength of round granular potash fertilizer, in particular to a preparation method for increasing the strength of round granular potash fertilizer, especially the strength of wet granules, and belongs to the field of fertilizer manufacturing.
Background
The potassium fertilizer is different from other macroelement fertilizers in forms at home and abroad, the most common nitrogen fertilizer urea is round granules at home and abroad, the most common phosphate fertilizer monoammonium phosphate, diammonium phosphate and triple superphosphate are round granules, most of the potassium fertilizer at home and abroad exists in an extrusion form, and the potassium fertilizer is a sand mold material for manufacturing round granular potassium fertilizer, so that the granular strength is weaker, the granular strength is easy to disperse like mixing a group of fine sand into a ball, and if the strength of wet granules is increased when the round granular potassium fertilizer is manufactured, the granular potassium fertilizer can be ensured to carry out mass production treatment and cannot disperse.
When the potash fertilizer is dried, if the dynamic potash fertilizer is used, the potash fertilizer is basically pulverized into powder, and the wet strength of the round granular potash fertilizer is less than 1N and is in a state of scattering at once. If the static drying is used, the mass production is difficult, and the production cost is overhigh. If the strength of the potash fertilizer particles can be enhanced, the round particle potash fertilizer can be developed, and the round particle potash fertilizer can be massively produced by using dynamic drying, so that the defect that the potash fertilizer as one of three major elements does not have round particles is overcome.
The round particle potash fertilizer is one of the necessary development conditions of fertilizer preparation and slow release fertilizer, the potash fertilizer prepared by the method utilizes oxide and alkaline reaction heat release to reduce part of water in the particles and improve part of strength, the method can enhance the activity of the added beneficial trace elements, the oxide needs to be converted into particles through soil conversion in sudden, and the particles are absorbed by crops, and the method ensures that the trace elements required by the crops are also converted from the oxide into ionic state through acid reaction and absorbed by the crops on the premise of improving the strength of the fertilizer.
Disclosure of Invention
Aiming at the defects of the potash fertilizer in the background art, the invention provides a preparation method for increasing the wet strength of round-particle potash fertilizer. The acidic granulation auxiliary agent and the alkaline substance react to release heat so as to volatilize part of water and increase the wet strength of the particles, so that the yield of the potash fertilizer particles can be improved on one hand, and the production energy consumption can be reduced on the other hand.
In order to realize the purpose of the invention, the following technical scheme is adopted:
a granulation method for increasing the wet strength of round particle potash fertilizer is characterized by comprising the following steps:
(1) putting a potash fertilizer in a raw material bin, putting auxiliary materials in an auxiliary material bin, simultaneously conveying the potash fertilizer and the auxiliary materials to a ball mill according to a certain proportion through a belt, and grinding for 10-30min through the ball mill;
(2) placing the acidic granulation auxiliary agent aqueous solution in a granulation auxiliary agent storage tank; the mass concentration of the acidic granulation auxiliary agent aqueous solution is 0.1-10%;
(3) adding the ground potash fertilizer powder into a granulation auxiliary agent aqueous solution through a disc or a roller for granulation;
(4) and drying, screening and packaging the granulated potash fertilizer.
The potash fertilizer is one or a mixture of more than two of potassium sulfate, potassium chloride, monopotassium phosphate, potassium nitrate and potassium carbonate.
The auxiliary material is one or a mixture of more than two of calcium oxide, ferric oxide, calcium hydroxide, magnesium oxide, magnesium hydroxide, ferric hydroxide, calcium magnesium phosphate fertilizer and polymerized calcium silicate.
In the step (1), the fineness of the potassium fertilizer subjected to ball milling in the potassium fertilizer is less than 178um, and the proportion of the potassium fertilizer less than 178um is more than 90%.
The acidic granulation auxiliary agent in the step (2) is one or a mixture of more than two of phosphoric acid, hydrochloric acid, sulfuric acid, nitric acid, acetic acid and citric acid.
Returning the screened potassium fertilizer particles smaller than 2mm to the granulation roller or the disc for re-granulation, and crushing and pulverizing the potassium fertilizer particles larger than 4mm and then re-granulating the potassium fertilizer particles in the granulation roller or the disc.
The ratio of the potash fertilizer to the auxiliary materials is 99.9-99: 0.1-1.
The invention has the following advantages: the round particle potash fertilizer prepared by the method can increase the particle strength of wet particles during granulation, effectively improve the particle yield and greatly reduce the drying energy consumption during drying.
Detailed Description
The invention is further described with reference to the examples, wherein the starting materials of the invention are purchased directly.
Example 1
(1) Respectively putting the magnesium oxide and the potassium sulfate into two bins by controlling the weighing scale, and mixing the magnesium oxide and the potassium sulfate in a proportion of 0.02: 9.98, conveying the magnesium oxide and the potassium sulfate into a ball mill simultaneously through a belt, and mixing and grinding the materials in the ball mill for 30 min;
(2) conveying the mixed materials to a granulation roller through a belt, and placing phosphoric acid aqueous solution with the mass concentration of 0.5% in a granulation auxiliary agent storage tank; spraying a phosphoric acid aqueous solution with the mass concentration of 0.5% onto the surface of the fertilizer through an atomizing nozzle to form potassium sulfate into particles;
(3) and (4) feeding the granulated potassium sulfate into a drying roller for drying, and screening and packaging after the fertilizer is dried.
The pure potassium sulfate and the potassium sulfate prepared by the method are respectively granulated by a roller and are not dried, the strength test is carried out, 30 potassium sulfates with uniform size are respectively taken to carry out the strength test on a strength instrument, and finally the average strength is taken as a comparative standard.
The comparison of the above table with round particles of potassium sulfate, which are not dried, shows that the potassium sulfate particles produced by the method of the present invention will have a particle strength increased by about 7 times.
Example 2
(1) Respectively putting calcium oxide and potassium sulfate into two bins, putting the materials by controlling the weighing scale, and mixing the materials by mixing the calcium oxide and the potassium sulfate in a ratio of 0.05: 9.95, conveying the calcium oxide and the potassium sulfate into a ball mill simultaneously through a belt, and mixing and grinding the materials in the ball mill for 30 min;
(2) conveying the mixed materials to a granulation roller through a belt, and placing phosphoric acid aqueous solution with the mass concentration of 0.8% in a granulation auxiliary agent storage tank; spraying a phosphoric acid aqueous solution with the mass concentration of 0.8% to the surface of the fertilizer through an atomizing nozzle to form potassium sulfate into particles;
(3) and (4) feeding the granulated potassium sulfate into a drying roller for drying, and screening and packaging after the fertilizer is dried.
The pure potassium sulfate and the potassium sulfate prepared by the method are respectively granulated by a roller and are not dried, the strength test is carried out, 30 potassium sulfates with uniform size are respectively taken to carry out the strength test on a strength instrument, and finally the average strength is taken as a comparative standard.
The comparison of the above table with round particles of potassium sulfate, which are not dried, shows that the potassium sulfate particles produced by the method of the present invention will have about 10 times higher particle strength.
Example 3
(1) Respectively putting calcium oxide and potassium chloride into two bins, putting the materials by controlling the weighing, and mixing the materials by mixing the calcium oxide and the potassium sulfate in a ratio of 0.09: 9.91, conveying the calcium oxide and the potassium chloride into a ball mill through a belt, and mixing and grinding for 30min in the ball mill;
(2) conveying the mixed materials to a granulation roller through a belt, and placing a hydrochloric acid aqueous solution with the mass concentration of 1% into a granulation auxiliary agent storage tank; spraying a hydrochloric acid aqueous solution with the mass concentration of 1% onto the surface of the fertilizer through an atomizing nozzle to enable potassium chloride to form particles;
(3) and (4) sending the granulated potassium chloride into a drying roller for drying, and screening and packaging after the fertilizer is dried.
The pure potassium chloride and the potassium chloride prepared by the method are respectively granulated by a roller and are subjected to strength test when not being dried, 30 potassium chloride particles with uniform size are respectively taken to be subjected to strength test on a strength tester, and finally the average strength is taken as a comparative standard.
The comparison of the above table with round particles of potassium chloride, which are not dried, shows that the potassium chloride particles produced by the method of the present invention will have about 15 times higher particle strength.
Example 4
(1) Put into the material through controlling the measurement balance in throwing calcium magnesium phosphate fertilizer and potassium nitrate respectively two feed bins, with the material with calcium magnesium phosphate fertilizer and potassium nitrate with 0.1: 9.9, conveying the calcium magnesium phosphate fertilizer and the potassium nitrate into a ball mill simultaneously through a belt, and mixing and grinding for 10min in the ball mill;
(2) conveying the mixed materials to a granulation roller through a belt, and putting a nitric acid aqueous solution with the mass concentration of 0.5% into a granulation auxiliary agent storage tank; spraying nitric acid water solution with the mass concentration of 0.5% to the surface of the fertilizer through an atomizing nozzle to enable potassium nitrate to form particles;
(3) and (4) sending the prepared potassium nitrate into a drying roller for drying, and screening and packaging after the fertilizer is dried.
Pure potassium nitrate and the potassium nitrate prepared by the method are respectively granulated by a roller and are subjected to strength test when not being dried, 30 potassium nitrates with uniform sizes are respectively taken to be subjected to the strength test on a strength tester, and finally the average strength is taken as a comparative standard.
The comparison of the above table with round potassium nitrate unbaked granules shows that the potassium nitrate granules produced by the method of the present invention have about 10 times higher granule strength.
Example 5
(1) Putting iron oxide and potassium sulfate into two bins respectively, putting the materials by controlling the weighing scale, and mixing the materials by mixing the iron oxide and the potassium sulfate in a ratio of 0.01: 9.99, conveying the iron oxide and the potassium sulfate into a ball mill simultaneously through a belt, and mixing and grinding for 20min in the ball mill;
(2) conveying the mixed materials to a granulation roller through a belt, and placing a citric acid aqueous solution with the mass concentration of 0.8% in a granulation auxiliary agent storage tank; spraying 0.8% citric acid aqueous solution onto the surface of the fertilizer through an atomizing nozzle to form potassium sulfate into particles;
(3) and (4) feeding the granulated potassium sulfate into a drying roller for drying, and screening and packaging after the fertilizer is dried.
The pure potassium sulfate and the potassium sulfate prepared by the method are respectively granulated by a roller and are not dried, the strength test is carried out, 30 potassium sulfates with uniform size are respectively taken to carry out the strength test on a strength instrument, and finally the average strength is taken as a comparative standard.
The comparison of the above table with round particles of potassium sulfate, which are not dried, shows that the potassium sulfate particles produced by the method of the present invention will have about 10 times higher particle strength.
Claims (7)
1. A granulation method for increasing the wet strength of round particle potash fertilizer is characterized by comprising the following steps:
(1) putting a potash fertilizer in a raw material bin, putting auxiliary materials in an auxiliary material bin, simultaneously conveying the potash fertilizer and the auxiliary materials to a ball mill according to a certain proportion through a belt, and grinding for 10-30min through the ball mill;
(2) placing the acidic granulation auxiliary agent aqueous solution in a granulation auxiliary agent storage tank; the mass concentration of the acidic granulation auxiliary agent aqueous solution is 0.1-10%;
(3) adding the ground potash fertilizer powder into a granulation auxiliary agent aqueous solution through a disc or a roller for granulation;
(4) and drying, screening and packaging the granulated potash fertilizer.
2. The granulation process for increasing the wet strength of round pellet potash fertilizer as claimed in claim 1, wherein: the potash fertilizer is one or a mixture of more than two of potassium sulfate, potassium chloride, monopotassium phosphate, potassium nitrate and potassium carbonate.
3. The granulation process for increasing the wet strength of round pellet potash fertilizer as claimed in claim 1, wherein: the auxiliary material is one or a mixture of more than two of calcium oxide, ferric oxide, calcium hydroxide, magnesium oxide, magnesium hydroxide, ferric hydroxide, calcium magnesium phosphate fertilizer and polymerized calcium silicate.
4. The granulation process for increasing the wet strength of round pellet potash fertilizer as claimed in claim 1, wherein: in the step (1), the fineness of the potassium fertilizer subjected to ball milling in the potassium fertilizer is less than 178um, and the proportion of the potassium fertilizer less than 178um is more than 90%.
5. The granulation process for increasing the wet strength of round pellet potash fertilizer as claimed in claim 1, wherein: the acidic granulation auxiliary agent in the step (2) is one or a mixture of more than two of phosphoric acid, hydrochloric acid, sulfuric acid, nitric acid, acetic acid and citric acid.
6. The granulation process for increasing the wet strength of round pellet potash fertilizer as claimed in claim 1, wherein: returning the screened potassium fertilizer particles smaller than 2mm to the granulation roller or the disc for re-granulation, and crushing and pulverizing the potassium fertilizer particles larger than 4mm and then re-granulating the potassium fertilizer particles in the granulation roller or the disc.
7. The granulation process for increasing the wet strength of round pellet potash fertilizer as claimed in claim 1, wherein: the ratio of the potash fertilizer to the auxiliary materials is 99.9-99: 0.1-1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110819376.5A CN113603558A (en) | 2021-07-20 | 2021-07-20 | Granulation method for increasing wet strength of round granular potash fertilizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110819376.5A CN113603558A (en) | 2021-07-20 | 2021-07-20 | Granulation method for increasing wet strength of round granular potash fertilizer |
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| Publication Number | Publication Date |
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| CN113603558A true CN113603558A (en) | 2021-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110819376.5A Pending CN113603558A (en) | 2021-07-20 | 2021-07-20 | Granulation method for increasing wet strength of round granular potash fertilizer |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102001872A (en) * | 2009-12-15 | 2011-04-06 | 深圳市芭田生态工程股份有限公司 | method for producing granular potash fertilizer and product thereof |
| CN104829331A (en) * | 2015-04-21 | 2015-08-12 | 湖北省农业科学院植保土肥研究所 | Round particle slow release potash fertilizer preparation method |
| CN106278607A (en) * | 2016-08-15 | 2017-01-04 | 湖北富邦科技股份有限公司 | A kind of preparation method containing zinc slow release rounded grain potash fertilizer |
| CN107986887A (en) * | 2018-01-15 | 2018-05-04 | 中化农业（临沂）研发中心有限公司 | A kind of circle high intensity granule potassium chloride fertilizer and its manufacture method |
| CN108033862A (en) * | 2018-01-04 | 2018-05-15 | 中化农业（临沂）研发中心有限公司 | A kind of preparation method of novel high-strength circular granular potassium sulfate |
-
2021
- 2021-07-20 CN CN202110819376.5A patent/CN113603558A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102001872A (en) * | 2009-12-15 | 2011-04-06 | 深圳市芭田生态工程股份有限公司 | method for producing granular potash fertilizer and product thereof |
| CN104829331A (en) * | 2015-04-21 | 2015-08-12 | 湖北省农业科学院植保土肥研究所 | Round particle slow release potash fertilizer preparation method |
| CN106278607A (en) * | 2016-08-15 | 2017-01-04 | 湖北富邦科技股份有限公司 | A kind of preparation method containing zinc slow release rounded grain potash fertilizer |
| CN108033862A (en) * | 2018-01-04 | 2018-05-15 | 中化农业（临沂）研发中心有限公司 | A kind of preparation method of novel high-strength circular granular potassium sulfate |
| CN107986887A (en) * | 2018-01-15 | 2018-05-04 | 中化农业（临沂）研发中心有限公司 | A kind of circle high intensity granule potassium chloride fertilizer and its manufacture method |
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Application publication date: 20211105 |
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