CN108101586A - A kind of nitric acid solution phosphorus ore freezing decalcification mother liquor prepares Nitro Phosphate Unit and method - Google Patents
A kind of nitric acid solution phosphorus ore freezing decalcification mother liquor prepares Nitro Phosphate Unit and method Download PDFInfo
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- CN108101586A CN108101586A CN201711331220.2A CN201711331220A CN108101586A CN 108101586 A CN108101586 A CN 108101586A CN 201711331220 A CN201711331220 A CN 201711331220A CN 108101586 A CN108101586 A CN 108101586A
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- mother liquor
- decalcification
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- freezing
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B17/00—Other phosphatic fertilisers, e.g. soft rock phosphates, bone meal
-
- 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
Abstract
The present invention relates to nitrophosphate fertilizer aggregate rate improving environment fields, especially a kind of nitric acid solution phosphorus ore freezing decalcification mother liquor prepares Nitro Phosphate Unit and method, shunting processing is carried out by the mother liquor come out to decalcification mother liquor tank, so that formed two plumes to decalcification mother liquor, and it is coupled by phosphoric acid extraction unit with decalcification mother liquor concentrations unit, enable two plumes to decalcification mother liquor carry out different processing respectively, and it is handled by synthesis in synthesis granulation tower, so that the aggregate rate of the nitrophosphate fertilizer prepared using freezing is improved, the quality of nitrophosphate fertilizer is improved.
Description
Technical field
The present invention relates to nitrophosphate fertilizer aggregate rate improving environment field, especially a kind of nitric acid solution phosphorus ore freezing decalcification is female
Liquid prepares Nitro Phosphate Unit and method.
Background technology
Phosphate Fertilizer Nitrate with Frozen Method production technology is that phosphorus ore is carried out acidolysis using nitric acid to obtain acid hydrolysis solution, and acid hydrolysis solution is passed through
Freezing deliming is crossed, decalcification mother liquor is obtained and is prepared into nitrophosphate fertilizer as raw material.And in the prior art, for decalcification mother liquor as former
Material prepares nitrophosphate fertilizer, is to pass through decalcification mother liquor neutralize, concentrate, being granulated.But in the acidolysis liquid that freezing obtains
In system, acid hydrolysis solution main component is Ca (NO3)2、H3PO4、HNO3、H2O, moisture is higher, and phosphate radical accounting is extremely low, master
Will the reason is that：Global phosphorus ore grade is generally relatively low, and average grade is 21.5% (P2O5), and in China, mid low grade phosphate rock accounts for
More than 70% so that using nitric acid solution phosphorus ore, when freezing prepares nitrophosphate fertilizer, phosphorus ore quality is low, the nitrophosphate fertilizer of acquisition
Aggregate rate is generally relatively low, maintains less than 3% for a long time, and the quality for causing nitrophosphate fertilizer is relatively low.
In consideration of it, this researcher passes through long-term exploration and practice, prepare nitrophosphate fertilizer for decalcification mother liquor and one kind is provided
New approaches.
The content of the invention
In order to solve the above technical problems existing in the prior art, it is de- to provide a kind of nitric acid solution phosphorus ore freezing by the present invention
Mother liquor of calcium prepares Nitro Phosphate Unit and method.
It is achieved particular by following technical scheme：
The first purpose of the invention is to provide：Nitric acid solution phosphorus ore freezing decalcification mother liquor prepares nitrophosphate fertilizer method,
Freezing is prepared in nitrophosphate fertilizer, by by nitric acid activated phosphorusore, obtained acid hydrolysis solution after freezing decalcification processing, obtains
Obtain decalcification mother liquor；Decalcification mother liquor is divided into two parts, portion passes through extractant extraction, washing, back extraction, concentration, neutralization, obtains
To polyphosphate；In addition it is a with after ammonium nitrate, ammonia neutralization, concentrating, adding in polyphosphate, be granulated, it is dry, it sieves, it is cold
But, nitrophosphate fertilizer is obtained.
Specifically include following steps：
(1) decalcification mother liquor is divided into two parts, portion is sent into extraction tower, is extracted by extractant so that in decalcification mother liquor
Into organic phase, raffinate phase is returned to be mixed phosphoric acid extraction with other a decalcification mother liquor, and occurs to neutralize instead with ammonium nitrate and/or ammonia
Should, concentration obtains enriching slurry；
(2) organic phase is transferred in scrubbing tower, organic phase is washed using cleaning solution, be sent into back extraction tower, using back washing agent
The phosphoric acid in organic phase is extracted, obtains strip liquor and back extraction extraction raffinate, back extraction extraction raffinate, which returns, extracts decalcification mother liquor, and strip liquor exists
At 140-170 DEG C, mass concentration >=80% is concentrated to, is sent into neutralization chamber, ammonia neutralization is passed through, obtains ammonium phosphate；Adjust temperature
For 190-210 DEG C, ammonium polyphosphate is obtained；
(3) the enriching slurry mass concentration of step (1) is adjusted to >=97.5%, and after being warming up to molten condition, with step
Suddenly the ammonium polyphosphate mixing that (2) obtain is added in comminutor, is granulated, is obtained nitrophosphate fertilizer.
It is preferred that the extractant is tributyl phosphate or n-hexane.
It is preferred that the cleaning solution is phosphoric acid, the acid of washing after washing returns to extraction step, is mixed with decalcification mother liquor.
It is preferred that the back washing agent is water, the strip liquor for being stripped out is partly into inspissator concentration, a part of conduct
It washes acid and returns to washing step as cleaning solution.
The granulation for preparing ammonium polyphosphate nitrophosphate fertilizer can be high tower cooling granulation and/or slurry-spraying pelletizing mode：
High tower cooling granulation：Ammonium polyphosphate and enriching slurry are uniformly mixed in hybrid reaction slot, utilize rotating centrifugal
Comminutor high-altitude is sprayed, and slurries and air heat exchange, slurry liquid are condensed into nitrophosphate fertilizer grain products.
Slurry-spraying pelletizing mode：Ammonium polyphosphate and enriching slurry are uniformly mixed in hybrid reaction slot, using 1.5~
The steam or pressure-air of 2.0MPa enter the spray gun of comminutor, to the slurry liquid pressurizing atomizing of flowing, make slurry liquid condense or
It is coated on formation nitrophosphate fertilizer grain products in the material curtain that comminutor shovelling plate is dug.
The second purpose of the invention is to provide a kind of nitric acid solution phosphorus ore freezing decalcification mother liquor and prepares nitrophosphate fertilizer dress
It puts, including decalcification mother liquor tank, the current divider connected with decalcification mother liquor tank, current divider is set there are two outlet, respectively with going to concentrate
It manages and extracting tube is gone to connect；Extracting tube is gone to be connected with the extraction tank in phosphoric acid extraction unit；Remove concentration tube and decalcification mother liquor concentrations
Mother liquor neutralization chamber connection in unit；Inspissator is provided in phosphoric acid extraction unit, inspissator is connected with phosphorus ammonium synth sink；Decalcification
Mother liquor neutralization chamber in mother liquor concentrations unit is connected with neutralizer inspissator；Phosphorus ammonium synth sink and neutralizer inspissator with synthesis
Granulation tower connects；Synthesis granulation tower is connected with drying tower；Drying tower is connected with sifter；Sifter is connected with cooling tower；Cooling
Tower is connected with product storage tank；Sifter is connected with synthesis granulation tower by refeed line.
It is preferred that the mother liquor neutralization chamber is connected with ammonia tank and/or ammonium nitrate slot.
It is preferred that the phosphorus ammonium synth sink and/or neutralizer inspissator is connected with ammonia tank.
It is preferred that the phosphoric acid extraction unit is connected by extraction tank, the extractant slot connected with extraction tank, sink；
It is provided between extraction tank and sink and washes sour return pipe a；Sink is connected with back extraction slot, and in back extraction slot between sink
It is provided with and washes sour return pipe b；Back extraction slot is connected with inspissator；Raffinate outlet is provided in extraction tank, and pipe is gone using raffinate
With concentration tube is gone to connect.
It is preferred that communicating pipe that the synthesis granulation tower is connected with phosphorus ammonium synth sink and/or synthesis granulation tower and neutralizer
The communicating pipe of inspissator connection is tubular reactor.
Compared with prior art, the technique effect of the invention is embodied in：
By to decalcification mother liquor tank come out mother liquor carry out shunting processing so that formed two plumes to decalcification mother liquor, and
Coupled by phosphoric acid extraction unit with decalcification mother liquor concentrations unit so that two plumes to decalcification mother liquor can carry out difference respectively
Processing, and by synthesis granulation tower and/or slurry-spraying pelletizing machine processing so that using freezing prepare nitrophosphate fertilizer polymerization
Rate is improved, and improves the quality of nitrophosphate fertilizer.
In addition, by the improvement to Phosphate Fertilizer Nitrate with Frozen Method process units and process route so that can not only
The material composition in decalcification mother liquor is made full use of, and effectively concentration can be avoided to increase, the pipeline blockage after viscosity increase
Phenomenon, and can realize that nitrophosphate fertilizer Nutrient distribution is uniform, improve the quality of nitrophosphate fertilizer.
The invention after current divider shunting processing, then by it to decalcification mother liquor by utilizing the dress of the invention
It puts and is handled, not only retained trace element in the part in phosphorus ore, also can effectively cause the nitrophosphate fertilizer prepared
Aggregate rate reaches between 6~35% so that the enhancing of the slow release effect of the nitrophosphate fertilizer of preparation, can reduce calcium in soil, iron,
The elements such as magnesium, aluminium cure precipitation, the activity of the ingredients such as enhancing microelements of calcium, iron, magnesium, aluminium.
The invention can be by decalcification mother liquor, shunt volume situation, next constantly adjust introduce extraction in current divider
Mother liquor amount in unit, realizes the improvement to nitrophosphate fertilizer aggregate rate；And the control of the mother liquor amount flowed out by mother liquor tank, most
The stay in grade of the nitrophosphate fertilizer prepared is realized eventually, and properties of product are more excellent.
Description of the drawings
Fig. 1 is the process flow chart of the invention.
Fig. 2 is the device connection relationship diagram of the invention.
1- phosphoric acid extraction unit 2- decalcification mother liquor concentrations unit 3- current divider 4- decalcification mother liquor tanks 5- goes concentration tube 6- to go to extract
Take pipe 7- ammonium nitrate slot 8- ammonia tank 9- phosphorus ammonium synth sinks 10- synthesis granulation tower 11- recycling ammonia pipe 12- delivery pipe 13- drying towers
14- sifter 15- refeed line 16- cooling tower 17- product storage tanks.
1-1- extractant slot 1-2- extraction tank 1-3- sinks 1-4- back extraction slot 1-5- inspissators 1-6- washes sour return pipe a 1-
7- washes sour return pipe b 1-8- raffinates and removes pipe.
2-1- mother liquor neutralization chamber 2-2- neutralizer inspissators.
Specific embodiment
It is limited technical scheme is further, but is required with specific embodiment below in conjunction with the accompanying drawings
The scope of protection is not only limited to made description.
As shown in Figure 1, in certain embodiments, nitric acid solution phosphorus ore freezing decalcification mother liquor prepares nitrophosphate fertilizer method, will
Freezing is prepared in nitrophosphate fertilizer, by by nitric acid activated phosphorusore, obtained acid hydrolysis solution after freezing decalcification processing, obtains
Decalcification mother liquor；Decalcification mother liquor is divided into two parts, portion passes through extractant extraction, washing, back extraction, concentration, neutralization, obtains
Polyphosphate；It is in addition a that dry, screening cools down with after ammonium nitrate, ammonia neutralization, concentrating, adding in polyphosphate, be granulated,
Obtain nitrophosphate fertilizer.
Specifically include following steps：
(1) decalcification mother liquor is divided into two parts, portion is sent into extraction tower, is extracted by extractant so that in decalcification mother liquor
Into organic phase, raffinate phase is returned to be mixed phosphoric acid extraction with other a decalcification mother liquor, and occurs to neutralize instead with ammonium nitrate and/or ammonia
Should, concentration obtains enriching slurry；
(2) organic phase is transferred in scrubbing tower, organic phase is washed using cleaning solution, be sent into back extraction tower, using back washing agent
The phosphoric acid in organic phase is extracted, obtains strip liquor and back extraction extraction raffinate, back extraction extraction raffinate, which returns, extracts decalcification mother liquor, and strip liquor exists
At 140-170 DEG C, mass concentration >=80% is concentrated to, is sent into neutralization chamber, ammonia neutralization is passed through, obtains ammonium phosphate；Adjust temperature
For 190-210 DEG C, ammonium polyphosphate is obtained；
(3) the enriching slurry mass concentration of step (1) is adjusted to >=97.5%, and after being warming up to molten condition, with step
Suddenly the ammonium polyphosphate mixing that (2) obtain is added in comminutor, is granulated, is obtained nitrophosphate fertilizer.
Can effectively utilize Phosphate Fertilizer Nitrate with Frozen Method preparation process output decalcification mother liquor, and using the decalcification mother liquor as
Raw material is produced the nitrophosphate fertilizer with high aggregate rate, and will not waste the nutrient in decalcification mother liquor so that the nitre of preparation
The quality of sour phosphate fertilizer is more excellent.
In certain embodiments, the extractant is tributyl phosphate or n-hexane.
In certain embodiments, the cleaning solution is phosphoric acid, and the acid of washing after washing returns to extraction step, female with decalcification
Liquid mixes.The waste of element is avoided, and can realize enrichment of element, improves extraction efficiency.
In certain embodiments, the back washing agent is water, and the strip liquor for being stripped out is partly into inspissator concentration,
A part returns to washing step as cleaning solution as acid is washed.Nutrient loss is reduced, improves washing effect, wash water is reduced and introduces,
Reduce concentration energy consumption.
As shown in Fig. 2, nitric acid solution phosphorus ore freezing decalcification mother liquor prepares Nitro Phosphate Unit, including decalcification mother liquor tank 4, with
The current divider 3 that decalcification mother liquor tank 4 connects, current divider 3 are set there are two outlet, respectively with removing concentration tube 5 and extracting tube 6 being gone to connect
It is logical；Extracting tube 6 is gone to be connected with the extraction tank 1-1 in phosphoric acid extraction unit 1；It goes in concentration tube 5 and decalcification mother liquor concentrations unit 2
Mother liquor neutralization chamber 2-1 is connected；Inspissator 1-5 is provided in phosphoric acid extraction unit 1, inspissator 1-5 is connected with phosphorus ammonium synth sink 9；
Mother liquor neutralization chamber 2-1 in decalcification mother liquor concentrations unit 2 is connected with neutralizer inspissator 2-2；Phosphorus ammonium synth sink 9 and neutralizer are dense
Contracting device 2-2 is connected with synthesis granulation tower 10；Synthesis granulation tower 10 is connected with drying tower 13；Drying tower 13 connects with sifter 14
It is logical；Sifter 14 is connected with cooling tower 16；Cooling tower 16 is connected with product storage tank 17；Sifter 14 passes through with synthesis granulation tower 10
Refeed line 15 connects.Effectively decalcification mother liquor can be made full use of, make full use of exhaust gas generated in technical process etc. discarded
Object reduces nutrient in decalcification mother liquor and dissipates, realizes the adjustable production of nitrophosphate fertilizer aggregate rate, and ensure that nitrophosphate fertilizer aggregate rate reaches
To more than 6%, the quality of nitrophosphate fertilizer is improved.
In certain embodiments, the mother liquor neutralization chamber 2-1 is connected with ammonia tank 8 and/or ammonium nitrate slot 7.It is effectively real
Neutralization concentration now is carried out to decalcification mother liquor, improves the nitrogen content of nitrophosphate fertilizer, improving quality.
In certain embodiments, the phosphorus ammonium synth sink 9 and/or neutralizer inspissator 2-2 are connected with ammonia tank 8.
In certain embodiments, the phosphoric acid extraction unit 1 is by extraction tank 1-2, the extractant connected with extraction tank 1-2
Slot 1-1, sink 1-3 are connected；It is provided between extraction tank 1-2 and sink 1-3 and washes sour return pipe a1-6；Sink 1-3 with
Slot 1-4 connections are stripped, and is provided between slot 1-4 to sink 1-3 is stripped and washes sour return pipe b1-7；Be stripped slot 1-4 with it is dense
Contracting device 1-5 is connected；Raffinate outlet is provided in extraction tank 1-2, and pipe 1-8 is gone with concentration tube 5 is gone to connect using raffinate.
In certain embodiments, what the synthesis granulation tower 10 was connected with phosphorus ammonium synth sink 9 makes communicating pipe and/or synthesis
The communicating pipe that grain tower 10 is connected with neutralizer inspissator 2-2 is tubular reactor.After material is entered tubular reactor, it will manage
Temperature and pressure in formula reactor is controlled, and material can effectively be caused to be in molten condition, and by anti-in tubular type
The effect of device is answered, the material that amount extraction cells come out is sprayed into synthesis granulation tower with the material that upgrading unit comes out and synthesized
Be granulated reaction so that the quality of the nitrophosphate fertilizer of preparation gets a promotion and improves, especially synthesis be granulated after, product it is strong
Spend high stability, the quality for improving nitrophosphate fertilizer of high degree.
In certain embodiments, for the temperature control in tubular reactor at 160-205 DEG C, pressure is controlled in 0.1-
0.4MPa so that after material enters, can Flashmelt, and during tubular reactor discharge gate is opened, penetrating
It synthesizes in granulation tower, not only realizes the uniform mixing of two strands of materials, improve contact rate, intensified response efficiency, and can make
It obtains two strands of materials and mutually impact occurs, improve Nutrient distribution uniformity, improve the quality of nitrophosphate fertilizer.
The invention carries out nitrophosphate fertilizer of the production with 6-35% aggregate rates using decalcification mother liquor as raw material, passes through
To decalcification mother liquor be split into two strands of liquid, and respectively by extraction cells and upgrading unit, and by the raffinate of extraction cells
Liquid concentrates after being mixed with the decalcification mother liquor of upgrading unit, reduces the waste of material so that gathering by height prepared by extraction
In the phosphate product of conjunction rate, adhere to the other impurities ingredient for having and being brought into decalcification mother liquor, be dispersed in polymer phosphate salt component
In so that the physical characteristic of polymeric phosphate is different from pure polymer phosphate salt component；Meanwhile in addition one decalcification mother liquor passes through
It is mixed with the raffinate of extraction processing process so that the relative amount of the active ingredient in decalcification mother liquor changes, and changes
Become the active ingredient of decalcification mother liquor, and pass it through neutralization, concentration after, obtain concentrate feed；And extraction cells are come out poly-
It closes the concentrate feed that phosphate and upgrading unit come out to be granulated by melt-synthesizing so that the nitrophosphate fertilizer of preparation is not only polymerizeing
Be improved in rate, and Jing Guo processing procedure nutrient adjustment and incidental impurities (such as silicon, magnesium and calcium element into
Point) facilitation so that the strength stability of the nitrophosphate fertilizer of preparation improves.
On nitrophosphate fertilizer products and marketing prepared by the present invention prepared by existing nitrophosphate fertilizer product, decalcification mother liquor direct polymerization
Nitrophosphate fertilizer contrasting detection result it is as follows：
Claims (10)
1. a kind of nitric acid solution phosphorus ore freezing decalcification mother liquor prepares nitrophosphate fertilizer method, which is characterized in that prepared by freezing nitre
In sour phosphate fertilizer, by by nitric acid activated phosphorusore, obtained acid hydrolysis solution after freezing decalcification processing, obtains decalcification mother liquor；It will be de-
Mother liquor of calcium is divided into two parts, and portion passes through extractant extraction, washing, back extraction, concentration, neutralization, obtains polyphosphate；Separately
Outer a with after ammonium nitrate, ammonia neutralization, concentrating, adding in polyphosphate, be granulated, dry, screening cools down, obtains nitrophosphate fertilizer.
2. nitric acid solution phosphorus ore freezing decalcification mother liquor as described in claim 1 prepares nitrophosphate fertilizer method, which is characterized in that bag
Include following steps：
(1) decalcification mother liquor is divided into two parts, portion is sent into extraction tower, is extracted by extractant so that the phosphoric acid in decalcification mother liquor
It being extracted into organic phase, raffinate phase is returned to be mixed with other a decalcification mother liquor, and neutralization reaction occurs with ammonium nitrate and/or ammonia,
Concentration, obtains enriching slurry；
(2) organic phase is transferred in scrubbing tower, organic phase is washed using cleaning solution, be sent into back extraction tower, extracted using back washing agent
Phosphoric acid in organic phase obtains strip liquor and back extraction extraction raffinate, and back extraction extraction raffinate, which returns, extracts decalcification mother liquor, and strip liquor is in 140-
At 170 DEG C, mass concentration >=80% is concentrated to, is sent into neutralization chamber, ammonia neutralization is passed through, obtains ammonium phosphate；Adjusting temperature is
190-210 DEG C, obtain ammonium polyphosphate；
(3) the enriching slurry mass concentration of step (1) is adjusted to >=97.5%, and after being warming up to molten condition, with step (2)
Obtained ammonium polyphosphate mixing is added in comminutor, is granulated, is obtained nitrophosphate fertilizer.
3. nitric acid solution phosphorus ore freezing decalcification mother liquor as claimed in claim 1 or 2 prepares nitrophosphate fertilizer method, feature exists
In the extractant is tributyl phosphate or n-hexane.
4. nitric acid solution phosphorus ore freezing decalcification mother liquor as claimed in claim 1 or 2 prepares nitrophosphate fertilizer method, feature exists
In：
(1) cleaning solution is phosphoric acid, and the acid of washing after washing returns to extraction step, is mixed with decalcification mother liquor.
(2) back washing agent is water, and the strip liquor for being stripped out is partly into inspissator concentration, and a part returns to washing as acid is washed
Step is as cleaning solution.
5. nitric acid solution phosphorus ore freezing decalcification mother liquor as claimed in claim 2 prepares nitrophosphate fertilizer method, which is characterized in that institute
Granulation is stated as high tower cooling granulation and/or slurry-spraying pelletizing mode：
The high tower cooling granulation：Ammonium polyphosphate and enriching slurry are uniformly mixed in hybrid reaction slot, utilize rotating centrifugal
Comminutor high-altitude is sprayed, and slurries and air heat exchange, slurry liquid are condensed into nitrophosphate fertilizer grain products；
Slurry-spraying pelletizing mode：Ammonium polyphosphate and enriching slurry are uniformly mixed in hybrid reaction slot, utilize 1.5~2.0MPa's
Steam or pressure-air enter the spray gun of comminutor, to the slurry liquid pressurizing atomizing of flowing, slurry liquid are made to condense or be coated on and is made
Nitrophosphate fertilizer grain products are formed in the material curtain that grain machine shovelling plate is dug.
6. a kind of nitric acid solution phosphorus ore freezing decalcification mother liquor prepares Nitro Phosphate Unit, which is characterized in that including decalcification mother liquor tank
(4), the current divider (3) connected with decalcification mother liquor tank (4), current divider (3) are set there are two outlet, respectively with removing concentration tube (5)
With extracting tube (6) is gone to connect；Extracting tube (6) is gone to be connected with the extraction tank (1-1) in phosphoric acid extraction unit (1)；Remove concentration tube (5)
It is connected with the mother liquor neutralization chamber (2-1) in decalcification mother liquor concentrations unit (2)；Phosphoric acid extraction unit is provided with inspissator (1- in (1)
5), inspissator (1-5) is connected with phosphorus ammonium synth sink (9)；Mother liquor neutralization chamber (2-1) in decalcification mother liquor concentrations unit (2) is in
It is connected with liquid inspissator (2-2)；Phosphorus ammonium synth sink (9) and neutralizer inspissator (2-2) are connected with synthesis granulation tower (10)；It closes
It is connected into granulation tower (10) with drying tower (13)；Drying tower (13) is connected with sifter (14)；Sifter (14) and cooling tower
(16) connect；Cooling tower (16) is connected with product storage tank (17)；Sifter (14) passes through refeed line with synthesis granulation tower (10)
(15) connect.
7. nitric acid solution phosphorus ore freezing decalcification mother liquor as claimed in claim 6 prepares Nitro Phosphate Unit, which is characterized in that institute
The mother liquor neutralization chamber (2-1) stated is connected with ammonia tank (8) and/or ammonium nitrate slot (7).
8. nitric acid solution phosphorus ore freezing decalcification mother liquor as claimed in claim 6 prepares Nitro Phosphate Unit, which is characterized in that institute
The phosphorus ammonium synth sink (9) and/or neutralizer inspissator (2-2) stated are connected with ammonia tank (8).
9. nitric acid solution phosphorus ore freezing decalcification mother liquor as claimed in claim 6 prepares Nitro Phosphate Unit, which is characterized in that institute
The phosphoric acid extraction unit (1) stated is by extraction tank (1-2), the extractant slot (1-1) connected with extraction tank (1-2), sink (1-3)
Connection；It is provided between extraction tank (1-2) and sink (1-3) and washes sour return pipe a (1-6)；Sink (1-3) and back extraction slot
(1-4) is connected, and washes sour return pipe b (1-7) to being provided between sink (1-3) in back extraction slot (1-4)；It is stripped slot (1-4)
It is connected with inspissator (1-5)；Raffinate outlet is provided in extraction tank (1-2), and using raffinate pipe (1-8) is gone to be concentrated with going
Manage (5) connection.
10. nitric acid solution phosphorus ore freezing decalcification mother liquor as claimed in claim 6 prepares Nitro Phosphate Unit, which is characterized in that
Communicating pipe that the synthesis granulation tower (10) is connected with phosphorus ammonium synth sink (9) and/or synthesis granulation tower (10) and neutralizer are dense
The communicating pipe of contracting device (2-2) connection is tubular reactor.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109160828A (en) * | 2018-08-22 | 2019-01-08 | 贵州芭田生态工程有限公司 | The neutralization of ammonia twice of mother liquor, method for concentration in Phosphate Fertilizer Nitrate with Frozen Method technical process |
| CN110734314A (en) * | 2018-07-19 | 2020-01-31 | 贵州芭田生态工程有限公司 | Phosphorus potassium nitrate fertilizer and preparation method thereof |
| CN110734304A (en) * | 2018-07-19 | 2020-01-31 | 贵州芭田生态工程有限公司 | Nitrophosphate fertilizer and preparation method thereof |
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| CN110734314A (en) * | 2018-07-19 | 2020-01-31 | 贵州芭田生态工程有限公司 | Phosphorus potassium nitrate fertilizer and preparation method thereof |
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| CN109160828A (en) * | 2018-08-22 | 2019-01-08 | 贵州芭田生态工程有限公司 | The neutralization of ammonia twice of mother liquor, method for concentration in Phosphate Fertilizer Nitrate with Frozen Method technical process |
| CN109160828B (en) * | 2018-08-22 | 2021-05-28 | 贵州芭田生态工程有限公司 | Method for twice ammonia neutralization and concentration of mother liquor in process of freezing method nitric phosphate fertilizer technology |
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