CN101717279A - Method for producing agricultural potassium metaphosphate - Google Patents
Method for producing agricultural potassium metaphosphate Download PDFInfo
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- CN101717279A CN101717279A CN200910102927A CN200910102927A CN101717279A CN 101717279 A CN101717279 A CN 101717279A CN 200910102927 A CN200910102927 A CN 200910102927A CN 200910102927 A CN200910102927 A CN 200910102927A CN 101717279 A CN101717279 A CN 101717279A
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- potassium metaphosphate
- agricultural
- potassium
- monoammonium phosphate
- reactor
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Abstract
The invention relates to a method for producing agricultural potassium metaphosphate, comprising the following steps: mixing agricultural monoammonium phosphate with potassium chloride, adding the mixture of the agricultural monoammonium phosphate and the potassium chloride to a reactor and heating the reactor to make the agricultural monoammonium phosphate and the potassium chloride react to generate molten potassium metaphosphate, sublimed ammonium chloride and water vapor; discharging the molten potassium metaphosphate, cooling and grinding to obtain the potassium metaphosphate product after the reaction; and cooling and recovering the sublimed ammonium chloride to be used as the agricultural fertilizer. The agricultural monoammonium phosphate accounts for 60-75 percent by weight, and the potassium chloride accounts for 25-40 percent by weight; the mass ratio of the agricultural monoammonium phosphate to the potassium chloride is 100:47-55; the agricultural monoammonium phosphate and the potassium chloride react at 600-900 DEG C are stand for 1-4h; and the reactor is a graphite reactor. The method can be used for producing the agricultural potassium metaphosphate and the ammonium chloride product without discharging the waste material, is easy to control, provides a new way for producing the slow-release potassium-phosphate fertilizer and has better economic and environmental-friendly benefits.
Description
Technical field
The present invention relates to the oxysalt of phosphorus, furthermore relate to potassium metaphosphate, specifically, belong to the method that potassium metaphosphate and ammonium chloride are produced in ammonium phosphate and Repone K metathesis.
Background technology
In the prior art, potassium metaphosphate has two kinds of manufacture method:
(1) be that raw material is made potassium metaphosphate with thermal phosphoric acid and Repone K, this method is that Repone K is mixed with thermal phosphoric acid, and reacting by heating generates potassium primary phosphate, obtains potassium metaphosphate through heat again.
Chemical equation is as follows:
2KCl+2H
3PO
4＝2KH
2PO
4+2HCl
2KH
2PO
4＝K
2H
2P
2O
7+H
2O
K
2H
2P
2O
7＝KPO
3+H
2O
(2) be that raw material is made potassium metaphosphate with element phosphor and Repone K
Element phosphor products of combustion and Repone K react, and can make potassium metaphosphate.
Chemical equation is as follows:
P
4+5O
2＝P
2O
5
2KCl+H
2O＝K
2O+2HCl
K
2O+P
2O
5＝KPO
3
The processing condition of U.S. TVA have been introduced in chemical fertilizer industry book series " phosphoric acid, phosphate fertilizer and composite fertilizer " the 1059-1060 page or leaf with aforesaid method manufacturing potassium metaphosphate.
Because aforesaid method is made the processing condition of potassium metaphosphate and is just carved, its conversion unit needs the liner zircon brick, exhaust gas recovery system is huge in addition, the facility investment height, the approach that by-product salt achlorhydria effectively utilizes, thermal phosphoric acid and element phosphor price are higher in addition, thereby have restricted this good fertilizer application on agricultural of potassium metaphosphate.
It is reported, Kunyang Phosphate Fertilizer Plant, Yunnan once carried out laboratory study to producing potassium metaphosphate with phosphate fertilizer and Repone K calendar year 2001, manufacture experimently out product, its experimentation is: phosphate fertilizer passes through pre-treatment, after mixing with powdery Repone K, put into electric furnace and be heated to 700 ℃～850 ℃, take out after keeping this temperature 30min, cooling is broken, obtain product (Wu Jianjun. the potassium metaphosphate production technique for fertilizer. Yunnan chemical, 2002,5:7-9).But this report does not illustrate what pre-treatment measure of employing, used phosphate fertilizer variety, other relevant processing condition is not described yet, and only is laboratory study.
Up to now, still the agricultural monoammonium phosphate of useless cheapness and agricultural potassium chloride are the relevant patent application of raw material production potassium metaphosphate side product sodium chloride.
Summary of the invention
The purpose of this invention is to provide agricultural monoammonium phosphate of a kind of usefulness and Repone K is the method for raw material production potassium metaphosphate side product sodium chloride, to make potassium metaphosphate with low cost and side product sodium chloride fertilizer.
To achieve the above object of the invention, the contriver explores following operational path through experimental study:
Monoammonium phosphate is mixed the back add the reactor internal heating with Repone K, monoammonium phosphate and Repone K react, and generate the potassium metaphosphate of molten state, the ammonium chloride and the water vapor of distillation, and reaction formula is as follows:
NH
4H
2P
2O
4+KCl＝KPO
3+NH
4Cl+H
2O
After reaction finishes, the potassium metaphosphate of molten state is emitted the pulverizing of cooling back promptly obtain the potassium metaphosphate product; The ammonium chloride that distils in the reacting by heating process reclaims by cooling and makes agricultural fertilizer.
In the above-mentioned technology, the massfraction of used monoammonium phosphate is 60%～75%, and the massfraction of Repone K is 40%～25%; The mass ratio of monoammonium phosphate and Repone K is 100: (47～55); Temperature of reaction is 600 ℃～900 ℃; The residence time is 1～4h.
Above-mentioned reactor reaction device is a graphiote reactor.
The potassium metaphosphate of above-mentioned molten state is emitted postcooling to temperature and is pulverized the potassium metaphosphate granularity≤1mm after the pulverizing during for room temperature.
The temperature that the ammonium chloride cooling of above-mentioned distillation is reclaimed is 110 ℃～180 ℃.
Processing method provided by the invention can make agricultural potassium metaphosphate product and ammonium chloride product simultaneously, and no effluent discharge is administered easily; Open up a variation route for producing slowly-releasing phosphorus potash fertilizer, had good economic benefit and environmental benefit.
Description of drawings
Accompanying drawing is the schematic flow sheet of technology of the present invention.
Embodiment
Embodiment 1:
With containing N 11.3%, P
2O
545.1% monoammonium phosphate and contain K
2O 60.6% Repone K is raw material, with the 120kg powdery monoammonium phosphate mix with 57kg Repone K be placed on plumbago crucible internal heating to 650～750 ℃ and keep 2 hours after, melt poured out is cooled to room temperature, be crushed to≤1mm promptly gets 113kg potassium metaphosphate goods.With plumbago crucible top escaping gas be evacuated to settling pocket be cooled to 110 ℃～180 ℃ get final product ammonium chloride 48kg, all the other waste gas wash the back emptying with water.Quality product is as follows:
Potassium metaphosphate is formed: P
2O
546.8%; K
2O 30.3%
Ammonium chloride is formed: N 25.3%.
Embodiment 2:
Use raw material with embodiment 1, with the 120kg powdery monoammonium phosphate mix with 65kg Repone K be placed on plumbago crucible internal heating to 750～800 ℃ and keep 1 hour after, melt poured out cool off room temperature, be crushed to≤1mm promptly gets 111kg potassium metaphosphate goods.With plumbago crucible top escaping gas be evacuated to settling pocket be cooled to 110 ℃～180 ℃ get final product ammonium chloride 47.2kg, all the other waste gas wash the back emptying with water.Quality product is as follows:
Potassium metaphosphate is formed: P
2O
547.6%, K
2O 33.2%;
Ammonium chloride is formed: N 25.1%.
Claims (5)
1. method for producing agricultural potassium metaphosphate, its special this method that is is agricultural monoammonium phosphate to be mixed the back add the reactor internal heating with Repone K, monoammonium phosphate and Repone K react, the potassium metaphosphate of generation molten state, the ammonium chloride and the water vapor of distillation; After reaction finishes, potassium metaphosphate is emitted the pulverizing of cooling back promptly obtain the potassium metaphosphate product; Ammonium chloride reclaims by cooling and makes agricultural fertilizer.
2. the method for claim 1, the massfraction that it is characterized in that described monoammonium phosphate is 60%～75%, the massfraction of Repone K is 40%～25%; The mass ratio of monoammonium phosphate and Repone K is 100: (47～55); Temperature of reaction is 600 ℃～900 ℃; The residence time is 1～4h.
3. the method for claim 1 is characterized in that described reactor is a graphiote reactor.
4. the method for claim 1 is pulverized when the potassium metaphosphate that it is characterized in that described molten state is emitted postcooling to room temperature, and the potassium metaphosphate granularity after the pulverizing is≤1mm.
5. the method for claim 1 is characterized in that temperature that the ammonium chloride cooling of described distillation is reclaimed is room temperature～180 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910102927A CN101717279A (en) | 2009-12-07 | 2009-12-07 | Method for producing agricultural potassium metaphosphate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910102927A CN101717279A (en) | 2009-12-07 | 2009-12-07 | Method for producing agricultural potassium metaphosphate |
Publications (1)
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|---|---|
| CN101717279A true CN101717279A (en) | 2010-06-02 |
Family
ID=42431925
Family Applications (1)
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|---|---|---|---|
| CN200910102927A Pending CN101717279A (en) | 2009-12-07 | 2009-12-07 | Method for producing agricultural potassium metaphosphate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103304301A (en) * | 2013-06-29 | 2013-09-18 | 贵州省五谷惠生态农业科技有限公司 | Production method of controlled-release phosphorus potassium fertilizer |
| CN112875669A (en) * | 2021-01-16 | 2021-06-01 | 黔南民族师范学院 | Method for preparing barium metaphosphate by decomposing barite with ammonium dihydrogen phosphate |
| CN115385318A (en) * | 2022-09-29 | 2022-11-25 | 云南莱德福科技有限公司 | Preparation method of water-soluble potassium polymetaphosphate |
-
2009
- 2009-12-07 CN CN200910102927A patent/CN101717279A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103304301A (en) * | 2013-06-29 | 2013-09-18 | 贵州省五谷惠生态农业科技有限公司 | Production method of controlled-release phosphorus potassium fertilizer |
| CN112875669A (en) * | 2021-01-16 | 2021-06-01 | 黔南民族师范学院 | Method for preparing barium metaphosphate by decomposing barite with ammonium dihydrogen phosphate |
| CN115385318A (en) * | 2022-09-29 | 2022-11-25 | 云南莱德福科技有限公司 | Preparation method of water-soluble potassium polymetaphosphate |
| CN115385318B (en) * | 2022-09-29 | 2023-05-09 | 云南莱德福科技有限公司 | Preparation method of water-soluble potassium polymetaphosphate |
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Application publication date: 20100602 |