CN103304301B - Production method of controlled-release phosphorus potassium fertilizer - Google Patents
Production method of controlled-release phosphorus potassium fertilizer Download PDFInfo
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- CN103304301B CN103304301B CN201310278039.5A CN201310278039A CN103304301B CN 103304301 B CN103304301 B CN 103304301B CN 201310278039 A CN201310278039 A CN 201310278039A CN 103304301 B CN103304301 B CN 103304301B
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- potassium sulfate
- potassium
- monocalcium phosphate
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Abstract
The invention discloses a production method of a controlled-release phosphorus potassium fertilizer. The method comprises the following steps: (1) pretreating 100 parts of potassium sulfate, wherein potassium sulfate is agricultural potassium sulfate and needs to be pretreated, grinding and crushing the potassium sulfate, and mixing the crushed potassium sulfate with 1 part of self prepared addition agent; (2) pretreating 75 parts of monocalcium phosphate, and grinding and crushing the monocalcium phosphate; (3) mixing the potassium sulfate with the monocalcium phosphate, and then, extruding a mixture to granulates; (4) preheating at 90-120 DEG C; and (5) transferring to a special reactor to react so as to obtain potassium metaphosphate. Compared with the prior art, the method is low in synthesizing temperature and energy-saving, and cannot corrode equipment in a reaction process.
Description
Technical field
The present invention relates to a kind of production of fertilizer, in particular to the method utilizing potassium sulfate and monocalcium phosphate to produce potassium metaphosphate and calcium sulfate molten mass slow release fertilizer.
Background technology
Potassium metaphosphate is a kind of excellent chemical fertilizer, this be due to: concentration can reach 96% the effective nutritive ingredient of plant (theoretical content K2O massfraction be about 38%, P2O5 massfraction be about 58%); Without chlorine and phytotoxicity rate low, can safe deep placement, directly contact in seed in time and plumule also can not be made to receive the infringement of burning; Be specially adapted to fear-chlorion crop, the cash crop such as such as tomato, potato, tobacco; Concentration is high, stable chemical nature, do not absorb water, be convenient to storage transport, wrapping material do not need special processing, and can with the nitrogen of uric acid, the contour composition of ammonium nitrate, phosphorus, potassium without chlorine application of mixed fertilizers.According to the different demands in the development of current technology and agriculture production, can make at present water-soluble, Chinese holly is molten or the potassium metaphosphate of slow release type.Although decades ago, potassium metaphosphate is just considered to a kind of favourable fertilizer form in theory, because the reason such as early stage, equipment and materials etching problem, service temperature are high and do not pass a test economically slowly fails large-scale industrial production.This technology is exactly a kind of method utilizing the character of potassium sulfate and monocalcium phosphate to manufacture slowly-releasing P-K fertilizer.Reduce service temperature, solve equipment corrosion problem.Also do not see relevant report and the patent application of producing slowly-releasing P-K fertilizer with potassium sulfate and monocalcium phosphate at present.
Summary of the invention
The object of the invention is to overcome deficiency of the prior art, a kind of production method of slow release type P-K fertilizer is provided, to solve the problem in background technology.
Object of the present invention is just to provide a kind of a kind of method that slow release type P-K fertilizer produced by potassium sulfate and monocalcium phosphate, and its adopts potassium sulfate pre-treatment, and monocalcium phosphate milled processed, synthesizes in special purpose reactor, and last frit reaction obtains this product.
A kind of production method of slow release type P-K fertilizer, following raw material is with weight ratio, comprise the following steps: the 100 parts of pre-treatment of (1) potassium sulfate, potassium sulfate is agricultural grade potassium sulfate, need through necessary pre-treatment, grind, particle diameter reaches 60 ~ 80 orders, the auxiliary agent 1 part of mixing independent development; Described auxiliary agent is made up of magnesiumcarbonate about 10 ~ 15%, borax 20 ~ 25%, calcium sulfate 55% ~ 65%.
(2) pre-treatment of monocalcium phosphate 75 parts, needs to grind to 60 ~ 80mu;
(3) mix potassium sulfate and monocalcium phosphate, then extruder grain, particle diameter is about 1 ~ 2mm;
(4) preheat, 90 ~ 120 DEG C;
(5) deliver to special purpose reactor to react, temperature is about about 280 ~ 320 DEG C, and the reaction times is about 2 ~ 3h, can obtain potassium metaphosphate.
Reacting main equation is: K
2sO
4+ CaH
2pO
4=2KPO
3+ CaSO
4+ H
2o
Beneficial effect:
Compared with prior art, synthesis temperature is low in the present invention, and conserve energy can not be corroded in equipment reaction process.
Accompanying drawing explanation
Fig. 1: production scheme of the present invention.
Embodiment
Reaching object to make technique means of the present invention, creation characteristic, workflow, using method and effect is easy to understand, below in conjunction with tool embodiment, setting forth the present invention further.
Present invention process potassium sulfate and monocalcium phosphate is adopted to produce Potassium polymetaphosphate and calcium sulfate molten mass slow release fertilizer:
The pre-treatment of the first step potassium sulfate, potassium sulfate is agricultural grade potassium sulfate, and need through necessary pre-treatment, detailed process is: get potassium sulfate (K2O content >=60%) 100kg and grind, particle diameter reaches 70 orders, the auxiliary agent 1kg of mixing independent development.
Second step gets the 75kg pre-treatment of monocalcium phosphate, needs to grind to 70mu;
3rd step mixing potassium sulfate and monocalcium phosphate, then extruder grain, particle diameter is about 1.5mm;
4th step pre-heating temperature is about 100 DEG C
5th step is delivered to special purpose reactor and is reacted, and temperature is about 300 DEG C, and the reaction times is about 2.5h.
Reactor product is through checking content as following table:
| N | P 2O 5 | K 2O | Total nutrient |
| O | 44.35％ | 31.04％ | 75.39％ |
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (1)
1. a production method for slow release type P-K fertilizer, following raw material, with weight ratio, is characterized in that, comprises the following steps:
(1) potassium sulfate 100 parts of pre-treatment, potassium sulfate is agricultural grade potassium sulfate, needs, through necessary pre-treatment, to grind, and particle diameter reaches 60 ~ 80 orders, the auxiliary agent 1 part of mixing independent development; Described auxiliary agent is made up of magnesiumcarbonate 10 ~ 15%, borax 20 ~ 25%, calcium sulfate 55% ~ 65%;
(2) pre-treatment of monocalcium phosphate 75 parts, needs to grind to 60 ~ 80mu;
(3) mix potassium sulfate and monocalcium phosphate, then extruder grain, particle diameter is about 1 ~ 2mm;
(4) preheat, 90 ~ 120 DEG C;
(5) deliver to special purpose reactor to react, temperature is 280 ~ 320 DEG C, and the reaction times is 2 ~ 3h, can obtain potassium metaphosphate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310278039.5A CN103304301B (en) | 2013-06-29 | 2013-06-29 | Production method of controlled-release phosphorus potassium fertilizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310278039.5A CN103304301B (en) | 2013-06-29 | 2013-06-29 | Production method of controlled-release phosphorus potassium fertilizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103304301A CN103304301A (en) | 2013-09-18 |
| CN103304301B true CN103304301B (en) | 2015-02-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310278039.5A Active CN103304301B (en) | 2013-06-29 | 2013-06-29 | Production method of controlled-release phosphorus potassium fertilizer |
Country Status (1)
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104311184A (en) * | 2014-09-19 | 2015-01-28 | 贵州大学 | Preparation method of special fertilizer for water spinach |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE644248A (en) * | 1963-02-26 | 1900-01-01 | ||
| CN101717279A (en) * | 2009-12-07 | 2010-06-02 | 贵州省化工研究院 | Method for producing agricultural potassium metaphosphate |
| CN102534777A (en) * | 2012-02-24 | 2012-07-04 | 南开大学 | Neodymium-doped potassium gadolinium phosphate laser crystal, and preparation method and application thereof |
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2013
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| CN103304301A (en) | 2013-09-18 |
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