CN105198503A - System and method for increasing nitric phosphate product P2O5 dissolvability in water - Google Patents
System and method for increasing nitric phosphate product P2O5 dissolvability in water Download PDFInfo
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- CN105198503A CN105198503A CN201510699561.XA CN201510699561A CN105198503A CN 105198503 A CN105198503 A CN 105198503A CN 201510699561 A CN201510699561 A CN 201510699561A CN 105198503 A CN105198503 A CN 105198503A
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Abstract
The invention discloses a system and a method for increasing a nitric phosphate product P2O5 dissolvability in water, belonging to the field of nitric phosphate production. Phosphorite is subjected to acidolysis, acid non-soluble substance separation, crystallization, filtering, neutralization, nitrogen and phosphorus evaporation, prilling, drying, screening, cooling and packing; mother liquor and potassium sulphate are added into a neutralizing tank according to a ratio, a small part of residual Ca<2+> are converted into calcium sulfate, generation of citric acid-soluble calcium hydrophosphate salt and insoluble phosphate is reduced, and K<+> is added in slurry. After the system is used, the production method is energy-saving and environment-friendly, a nutrient element kalium needed by plants is supplemented in a product while the dissolvability in water of a finished product P2O5 is increased, the material viscosity in a low temperature state in a neutralization process is reduced, and the quality of nitric phosphate is comprehensively improved.
Description
Technical field
The invention belongs to Phosphate Fertilizer Production field, particularly relating to a kind of system and method being the mother liquid ammonia neutralization of raw material indirect freezing method production nitrophosphate fertilizer with nitric acid and phosphorus ore, for improving P in nitrophosphate fertilizer product
2o
5water-soluble rate.
Background technology
Phosphate Fertilizer Production adopts indirect refrigeration deliming and double-shaft horizontal agglomeration technique.Production process mainly comprises: ammonium nitrate etc. is prepared in the conversion of concentrated, the granulation of the nitric acid decomposition of phosphorus ore, acid non-soluble substance separation, the neutralization of nitrocalcite Crystallization Separation, mother liquid ammonia, NP slip, drying, screening, packaging and nitrocalcite.
In Nitro Phosphate Unit N-process, owing to still containing higher Ca in phosphoric acid mother liquor
2+with the Mg of trace
2+, Fe
3+, Al
3+and the impurity such as acid non-soluble substance, along with the carrying out of N-process, in and slip in progressively can generate the even insoluble phosphoric acid salt of more insoluble, they are gelatinous fine crystalline body, thus increase with phosphoric acid in causing, especially in and pH value reach 2.7 and 4.5 time, phosphoric acid will peak value, neutralization method even can be made to operate cannot carry out, so, phosphoric acid mother liquor neutralization method adopts in normal pressure and groove type reactor, and point three sections of neutralizations complete, and controls to be 1.6 ~ 2.0,2.8 ~ 3.2,5.6 ~ 6.0 in each section with pH value.But along with the raising of degree of neutralization, the portion phosphate continuing to generate will be changed into insoluble calcium phosphate, and the Ca in mother liquor
2+higher, the insoluble calcium phosphate of generation is just more, causes the P in the finished product
2o
5water-soluble rate reduce, affect the quality of product.
Phosphate Fertilizer Nitrate with Frozen Method is high except crystallization nitrocalcite method has product concentration, and use the advantages such as raw material is single, but it can only isolate 65% ~ 75% of total calcium in acidolysis slip, deliming rate is not high enough, causes the P in nitrophosphate fertilizer the finished product
2o
5water-soluble rate is lower, thus reduces P
2o
5utilization ratio.In nitrophosphate fertilizer target level of product quality (GB/T10510 ~ 2007), nitrophosphate fertilizer salable product P
2o
5water-soluble rate index of performance is 40%, acceptable end product P
2o
5water-soluble rate index is 55%, premium grads P
2o
5water-soluble rate index also only has 70%, and P in salable product in ammonium phosphate product
2o
5water-soluble rate desired value at least requires more than 70%.
Summary of the invention
For the deficiency of above Phosphate Fertilizer Nitrate with Frozen Method calcium removal methods technology, in conjunction with China's phosphorus ore feature, the invention discloses a kind of raising nitrophosphate fertilizer product P
2o
5the system and method for water-soluble rate, applies the production method energy-conserving and environment-protective after this system, at raising finished product P
2o
5while water-soluble rate, in product, supplement the nutritive element potassium needed for plant, and reduce the material viscosity under N-process low-temperature condition, General Promotion nitrophosphate fertilizer quality.
The present invention is achieved through the following technical solutions:
A kind of raising nitrophosphate fertilizer product P
2o
5the system of water-soluble rate, comprising:
Acidolysis groove, for the acidolysis of raw material nitric acid and phosphorus ore, can select concentration to be that 58% ~ 62% nitric acid and phosphorus ore carry out acidolysis, due in phosphorus ore containing impurity such as iron, aluminium and silicon, acid non-soluble substance can be produced through acidolysis;
Acid non-soluble substance subsider, is communicated with acidolysis groove, carries out sedimentation for the acid hydrolysis solution overflow will produced from acidolysis groove to acid non-soluble substance subsider, discharges lower floor's acid non-soluble substance;
Crystallizer, is communicated with acid non-soluble substance subsider, carries out indirect heat exchange for being drained in crystallizer by the supernatant liquid in acid non-soluble substance subsider with refrigerant, makes acid hydrolysis solution crystallisation by cooling form nitrocalcite crystallization suspension;
Nitrocalcite filter, described nitrocalcite filter is communicated with crystallizer, and for nitrocalcite crystallization suspension being filtered, the nitrocalcite filter cake of formation is treated is converted into ammonium nitrate, separate the filtrate after most of nitrocalcite and form mother liquor, nitrocalcite fractional dose is about 65% ~ 75%;
Neutralising arrangement, be communicated with potassium sulfate solution dashpot with gas ammonia tank, ammonium nitrate storage tank, nitrocalcite filter, be introduced into neutralising arrangement and carry out neutralization reaction for nitrocalcite filter being filtered the mother liquor, potassium sulfate solution, gas ammonia, the ammonium nitrate that obtain and form slip;
Nitrogen phosphorus vaporizer, carries out evaporation concentration for being drawn by the slip in neutralising arrangement, and is recycled in neutralising arrangement by the gas ammonia evaporated; Follow-up is conventional treatment process.
Follow-up treatment process can be:
Double-shaft horizontal tablets press, is communicated with nitrogen phosphorus vaporizer, for slurry pipeline transport concentrated in nitrogen phosphorus vaporizer is carried out granulation to double-shaft horizontal tablets press;
Drying machine, is communicated with double-shaft horizontal tablets press, carries out drying for nitrogen phosphorus particle granulation in double-shaft horizontal tablets press produced;
Vibratory screening apparatus, is communicated with double-shaft horizontal tablets press with drying machine, for sieving dried nitrogen phosphorus particle, out-of-size particle being returned double-shaft horizontal tablets press and carries out granulation again;
Nitrogen phosphorus finished product water cooler, described nitrogen phosphorus finished product water cooler is communicated with vibratory screening apparatus, and the nitrogen phosphorus particle transport for the size qualification separated by Vibration Screen cools to nitrogen phosphorus finished product water cooler;
Parcel cylinder, described parcel cylinder is communicated with nitrogen phosphorus finished product water cooler, for cooled nitrogen phosphorus granule packaging is obtained finished product; Certainly, according to different demand, follow-up treatment process can make the appropriate adjustments.
As a kind of preferred implementation, described neutralising arrangement is in series by several average mechanisms, first average mechanism is communicated with potassium sulfate solution dashpot with gas ammonia tank, ammonium nitrate storage tank, nitrocalcite filter respectively, middle average mechanism is communicated with gas ammonia tank, ammonium nitrate storage tank respectively, last average mechanism is communicated with gas ammonia tank, ammonium nitrate storage tank respectively, and the discharge port of last average mechanism is communicated with nitrogen phosphorus vaporizer; Preferably, in described neutralising arrangement, at least one average mechanism is made up of at least two neutralizing well parallel connections.
As a kind of preferred implementation, described neutralising arrangement is in series by two average mechanisms, previous average mechanism is communicated with potassium sulfate solution dashpot with gas ammonia tank, ammonium nitrate storage tank, nitrocalcite filter respectively, a rear average mechanism is communicated with gas ammonia tank, ammonium nitrate storage tank respectively, and the discharge port of a rear average mechanism is communicated with nitrogen phosphorus vaporizer; Preferably, in neutralising arrangement, at least one average mechanism is made up of at least two neutralizing well parallel connections.
As a kind of preferred implementation, described neutralising arrangement only has an average mechanism, described average mechanism is communicated with potassium sulfate solution dashpot with gas ammonia tank, ammonium nitrate storage tank, nitrocalcite filter respectively, the discharge port of described average mechanism is communicated with nitrogen phosphorus vaporizer, preferably, described average mechanism is made up of at least two neutralizing well parallel connections.
Can comprise with gas ammonia used in workshop section the gas ammonia reclaimed from nitrogen phosphorus slip concentration section in certain mother liquid ammonia.
Owing to removing containing H in mother liquor
3pO
4, HNO
3outward, also containing higher Ca (NO
3)
2with the Mg (NO of trace
3)
2, Fe (NO
3)
3, Al (NO
3)
3and number acid insolubles, in neutralising arrangement, make the Ca (NO of the overwhelming majority in one section of neutralizing well
3)
2with K
2sO
4reaction generates sl. sol. CaSO
4, make the Ca in neutralising arrangement
2+amount little, change into CaHPO
4and Ca
3(PO
4)
2seldom, P in finished product is improved
2o
5water-soluble rate, promotes P
2o
5utilization ratio;
If the neutralising arrangement of the technical program adopts one, two, three section of average mechanism to connect successively, then the pH value in one, two, three section of average mechanism can be controlled to be 1.6 ~ 2.0,2.8 ~ 3.2,5.6 ~ 6.0, in neutralising arrangement, along with in and the increase of pH value, there is following chemical reaction successively:
First in the first paragraph and time, the nitric acid in gas ammonia and mother liquor and phosphoric acid react, and generate ammonium nitrate and monoammonium phosphate, reaction formula is:
Ca(NO
3)
2+K
2SO
4=CaSO
4+2KNO
3
NH
3+HNO
3=NH
4NO
3
NH
3+H
3PO
4=NH
4H
2PO
4
In and second segment, monoammonium phosphate continues to react with gas ammonia, and generate diammonium phosphate, reaction formula is:
NH
4H
2PO
4+NH
3=(NH
4)
2HPO
4
More than reaction is the main reaction of N-process, while generation main reaction, monoammonium phosphate again with the Ca (NO in mother liquor
3)
2with Mg (NO
3)
2a series of side reaction occurs, and reaction formula is as follows:
2NH
4H
2PO
4+Ca(NO
3)
2=Ca(H
2PO
4)
2+2NH
4NO
3
2NH
4H
2PO
4+Mg(NO
3)
2=Mg(H
2PO
4)
2+2NH
4NO
3
Be neutralized to the 3rd section if continue, mono-calcium phosphate and phosphoric acid one magnesium can transform again and generate Si Liaodengji dicalcium phosphate feed grade and di(2-ethylhexyl)phosphate magnesium, and reaction formula is:
Ca(H
2PO
4)
2+Ca(NO
3)
2+2NH
3=2CaHPO
4+2NH
4NO
3
Mg(H
2PO
4)
2+Mg(NO
3)
2+2NH
3=2MgHPO
4+2NH
4NO
3
If continue neutralization to go down, then dicalcium and two magnesium change into again DFP and three magnesium, and reaction formula is:
2CaHPO
4+Ca(NO
3)
2+2NH
3=Ca
3(PO
4)
2+2NH
4NO
3
2MgHPO
4+Ca(NO
3)
2+2NH
3=Mg
3(PO
4)
2+2NH
4NO
3
Along with the carrying out of N-process, in and slip in progressively can generate the even insoluble hydrophosphate of more insoluble and phosphoric acid normal salt, make the P of final finished
2o
5water-soluble rate reduces, and affects final product quality, therefore, makes Ca in mother liquor
2+, especially to enter in two, three sections of average mechanisms Ca in slip
2+content more low better, in one section of average mechanism of the technical program, introduce potassium sulfate solution, to make in one section of average mechanism the Ca (NO of the overwhelming majority
3)
2with K
2sO
4reaction generates sl. sol. CaSO
4, make to enter Ca in two, three sections of average mechanisms
2+amount little, change into CaHPO
4and Ca
3(PO
4)
2seldom, improve P in finished product
2o
5water-soluble rate, promotes P
2o
5utilization ratio.
Another object of the present invention is to provide P in a kind of raising nitrophosphate fertilizer product
2o
5the method of water-soluble rate, first the acid hydrolysis solution that phosphorus ore and nitric acid solution produce is carried out sedimentation, discharge the acid non-soluble substance of lower floor, supernatant liquid forms nitrocalcite crystallization suspension through crystallization, then nitrocalcite crystallization suspension is carried out filtering the phosphoric acid mother liquor forming filter cake and filter out 65% ~ 75% nitrocalcite, by in mother liquor and after carry out nitrogen phosphorus evaporation concentration again, particularly, add potassium sulfate solution, gas ammonia and ammonium nitrate and carry out neutralization reaction in mother liquor and in workshop section.
Consider that level of response and the later stage of method evaporate, dry Cost Problems, generally the concentration of potassium sulfate solution is controlled to be advisable 50% ~ 60%, and potassium sulfate solution addition is in ammonia and mother liquor runs 2% ~ 15% of total amount.
As a kind of preferred implementation, described gas ammonia comprises the gas ammonia reclaimed from nitrogen phosphorus slip concentration section.
Accompanying drawing explanation
Fig. 1 is the holistic approach schema of the embodiment of the present invention 1.
Fig. 2 is the holistic approach schema of the embodiment of the present invention 2.
Fig. 3 is the holistic approach schema of the embodiment of the present invention 3 ~ 4.
In figure: 1. acidolysis groove, 2. acid non-soluble substance subsider, 3. crystallizer, 4. nitrocalcite filter, 5. one section of neutralizing well, 6. two sections of neutralizing wells, 7. three sections of neutralizing wells, 8. nitrogen phosphorus vaporizer, 9. double-shaft horizontal tablets press, 10. drying machine, 11. vibratory screening apparatuss, 12. nitrogen phosphorus finished product water coolers, 13. parcel cylinder, 14. ammonia recovery units, 15. gas ammonia tanks, 16. ammonium nitrate storage tanks, 17. potassium sulfate solution dashpots.
Embodiment
Embodiment 1
Improve nitrophosphate fertilizer product P
2o
5concentration is that nitric acid and the phosphorus ore of 62% carries out acidolysis in acidolysis groove by the system of water-soluble rate, owing to containing the impurity such as iron, aluminium and silicon in phosphorus ore, can produce acid non-soluble substance through acidolysis, the acid hydrolysis solution overflowed in acidolysis groove 1 is drained in acid non-soluble substance subsider 2 and carries out natural subsidence, lower floor's acid non-soluble substance is discharged after collecting, supernatant liquid flow in crystallizer 3, and the ammoniacal liquor being 20% by massfraction makes refrigerant and acid hydrolysis solution carries out heat exchange crystallization cooling, nitrocalcite crystallization suspension after crystallization is drained in nitrocalcite filter 4 from crystallizer 3, ammonium nitrate is converted into through method process by filtering the nitrocalcite filter cake formed, by the mother liquor formed after separating 75% nitrocalcite with account for mother liquor run concentration that total amount is about 2% be 50% potassium sulfate solution introduce neutralising arrangement, this neutralising arrangement only has one section of neutralizing well 5, streams in one section of neutralizing well 5 is through nitrogen phosphorus vaporizer 8, the gas ammonia evaporated in nitrogen phosphorus vaporizer enters ammonia recovery unit 14, ammonia in ammonia recovery unit 14, gas ammonia in gas ammonia tank 15, ammonium nitrate in nitric acid ammonia storage tank 16 enters one section of neutralizing well 5 and reacts, slip in ammonia phosphorus vaporizer 8 sieves through double-shaft horizontal tablets press 9 granulation, drying machine 10 drying, vibratory screening apparatus 11 successively after concentrated, out-of-size particle is returned double-shaft horizontal tablets press 9 and carry out granulation again, the finished particle of size qualification is delivered to nitrogen phosphorus finished product water cooler 12 to cool, wrap up cylinder 13 and be packaged to be finished product, the P of finished product
2o
5water-soluble rate can reach 70%.
Embodiment 2
Improve nitrophosphate fertilizer product P
2o
5concentration is that nitric acid and the phosphorus ore of 60% carries out acidolysis 1 in acidolysis groove by the system of water-soluble rate, owing to containing the impurity such as iron, aluminium and silicon in phosphorus ore, can produce acid non-soluble substance through acidolysis, the acid hydrolysis solution overflowed in acidolysis groove 1 is drained in acid non-soluble substance subsider 2 and carries out natural subsidence, lower floor's acid non-soluble substance is discharged after collecting, supernatant liquid flow in crystallizer 3, and the ammoniacal liquor being 20% by massfraction makes refrigerant and acid hydrolysis solution carries out heat exchange crystallization cooling, nitrocalcite crystallization suspension after crystallization is drained in nitrocalcite filter 4 from crystallizer 3, ammonium nitrate is converted into through method process by filtering the nitrocalcite filter cake formed, by the mother liquor formed after separating 70% nitrocalcite with account for mother liquor run concentration that total amount is about 8% be 55% potassium sulfate solution introduce neutralising arrangement, this neutralising arrangement is made up of one section of neutralizing well 5 and two sections of neutralizing wells 6, material in one section of neutralizing well 5 flows through two sections of neutralizing wells 6 and nitrogen phosphorus vaporizer 8 successively, the gas ammonia evaporated in nitrogen phosphorus vaporizer 8 enters ammonia recovery unit 14, ammonia in ammonia recovery unit 14, gas ammonia in gas ammonia tank 15, ammonium nitrate in nitric acid ammonia storage tank 16 enters one section of neutralizing well 5 respectively and two sections of neutralizing wells 6 react, slip in ammonia phosphorus vaporizer 8 sieves through double-shaft horizontal tablets press 9 granulation, drying machine 10 drying, vibratory screening apparatus 11 successively after concentrated, out-of-size particle is returned double-shaft horizontal tablets press 9 and carry out granulation again, the finished particle of size qualification is delivered to nitrogen phosphorus finished product water cooler 12 to cool, wrap up cylinder 13 and be packaged to be finished product, the P of finished product
2o
5water-soluble rate can reach 75%.
Embodiment 3
Improve nitrophosphate fertilizer product P
2o
5concentration is that nitric acid and the phosphorus ore of 60% carries out acidolysis in acidolysis groove 1 by the system of water-soluble rate, owing to containing the impurity such as iron, aluminium and silicon in phosphorus ore, can produce acid non-soluble substance through acidolysis, the acid hydrolysis solution overflowed in acidolysis groove 1 is drained in acid non-soluble substance subsider 2 and carries out natural subsidence, lower floor's acid non-soluble substance is discharged after collecting, supernatant liquid flow in crystallizer 3, and the ammoniacal liquor being 20% by massfraction makes refrigerant and acid hydrolysis solution carries out heat exchange crystallization cooling, nitrocalcite crystallization suspension after crystallization is drained in nitrocalcite filter 4 from crystallizer 3, ammonium nitrate is converted into through method process by filtering the nitrocalcite filter cake formed, by the mother liquor formed after separating 72% nitrocalcite, to run total amount be 11% with accounting for mother liquor, concentration is in one section of neutralizing well 5 of potassium sulfate solution introducing neutralising arrangement of 58%, neutralising arrangement is by one, two, three sections of neutralizing well formations, material in one section of neutralizing well 5 flows through two sections of neutralizing wells 6 successively, three sections of neutralizing wells 7 and nitrogen phosphorus vaporizer 8, the gas ammonia evaporated in nitrogen phosphorus vaporizer 8 enters ammonia recovery unit 14, ammonia in ammonia recovery unit 14, gas ammonia in gas ammonia tank 15, ammonium nitrate in nitric acid ammonia storage tank 16 enters one section of neutralizing well 5 respectively, two sections of neutralizing wells 6, three sections of neutralizing wells 7 react, and by one, two, it is 2.0 that pH value in three sections of neutralizing wells controls, 3.2, 6.0, slip in ammonia phosphorus vaporizer 8 sieves through double-shaft horizontal tablets press 9 granulation, drying machine 10 drying, vibratory screening apparatus 11 successively after concentrated, out-of-size particle is returned double-shaft horizontal tablets press 9 and carry out granulation again, the finished particle of size qualification is delivered to nitrogen phosphorus finished product water cooler 12 to cool, wrap up cylinder 13 and be packaged to be finished product, the P of finished product
2o
5water-soluble rate can reach 85%.
Embodiment 4
Improve nitrophosphate fertilizer product P
2o
5concentration is that nitric acid and the phosphorus ore of 58% carries out acidolysis in acidolysis groove 1 by the system of water-soluble rate, owing to containing the impurity such as iron, aluminium and silicon in phosphorus ore, can produce acid non-soluble substance through acidolysis, the acid hydrolysis solution overflowed in acidolysis groove 1 is drained in acid non-soluble substance subsider 2 and carries out natural subsidence, lower floor's acid non-soluble substance is discharged after collecting, supernatant liquid flow in crystallizer 3, and the ammoniacal liquor being 20% by massfraction makes refrigerant and acid hydrolysis solution carries out heat exchange crystallization cooling, nitrocalcite crystallization suspension after crystallization is drained in nitrocalcite filter 4 from crystallizer 3, ammonium nitrate is converted into through method process by filtering the nitrocalcite filter cake formed, by the mother liquor formed after separating 65% nitrocalcite, to run total amount be 15% with accounting for mother liquor, concentration is in one section of neutralizing well 5 of potassium sulfate solution introducing neutralising arrangement of 60%, neutralising arrangement is by one, two, three sections of neutralizing well formations, material in one section of neutralizing well 5 flows through two sections of neutralizing wells 6 successively, three sections of neutralizing wells 7 and nitrogen phosphorus vaporizer 8, the gas ammonia evaporated in nitrogen phosphorus vaporizer 8 enters ammonia recovery unit 14, ammonia in ammonia recovery unit 14, gas ammonia in gas ammonia tank 15, ammonium nitrate in nitric acid ammonia storage tank 16 enters one section of neutralizing well 5 respectively, two sections of neutralizing wells 6, three sections of neutralizing wells 7 react, and by one, two, it is 1.8 that pH value in three sections of neutralizing wells controls, 3.0, 5.8, slip in ammonia phosphorus vaporizer 8 sieves through double-shaft horizontal tablets press 9 granulation, drying machine 10 drying, vibratory screening apparatus 11 successively after concentrated, out-of-size particle is returned double-shaft horizontal tablets press 9 and carry out granulation again, the finished particle of size qualification is delivered to nitrogen phosphorus finished product water cooler 12 to cool, wrap up cylinder 13 and be packaged to be finished product, the P of finished product
2o
5water-soluble rate can reach 80%.
Claims (9)
1. one kind is improved nitrophosphate fertilizer product P
2o
5the system of water-soluble rate, comprising:
Acidolysis groove, for the acidolysis of raw material nitric acid and phosphorus ore;
Acid non-soluble substance subsider, is communicated with acidolysis groove, carries out sedimentation for the acid hydrolysis solution overflow will produced from acidolysis groove to acid non-soluble substance subsider, discharges lower floor's acid non-soluble substance;
Crystallizer, is communicated with acid non-soluble substance subsider, carries out crystallization cooling for being drained in crystallizer by the supernatant liquid in acid non-soluble substance subsider with refrigerant indirect heat exchange, forms nitrocalcite crystallization suspension;
Nitrocalcite filter, is communicated with crystallizer, for nitrocalcite crystallization suspension being filtered, forms nitrocalcite filter cake and mother liquor;
Neutralising arrangement, be communicated with potassium sulfate solution dashpot with gas ammonia tank, ammonium nitrate storage tank, nitrocalcite filter, be introduced into neutralising arrangement and carry out neutralization reaction for nitrocalcite filter being filtered the mother liquor, potassium sulfate solution, gas ammonia, the ammonium nitrate that obtain and form slip;
Nitrogen phosphorus vaporizer, carries out evaporation concentration for being drawn by the slip in neutralising arrangement, and is recycled in neutralising arrangement by the gas ammonia evaporated.
2. raising nitrophosphate fertilizer product P as claimed in claim 1
2o
5the system of water-soluble rate, it is characterized in that: described neutralising arrangement is in series by several average mechanisms, first average mechanism is communicated with potassium sulfate solution dashpot with gas ammonia tank, ammonium nitrate storage tank, nitrocalcite filter respectively, middle average mechanism is communicated with gas ammonia tank, ammonium nitrate storage tank respectively, last average mechanism is communicated with gas ammonia tank, ammonium nitrate storage tank respectively, and the discharge port of last average mechanism is communicated with nitrogen phosphorus vaporizer.
3. raising nitrophosphate fertilizer product P as claimed in claim 1
2o
5the system of water-soluble rate, it is characterized in that: described neutralising arrangement is in series by two average mechanisms, previous average mechanism is communicated with potassium sulfate solution dashpot with gas ammonia tank, ammonium nitrate storage tank, nitrocalcite filter respectively, a rear average mechanism is communicated with gas ammonia tank, ammonium nitrate storage tank respectively, and the discharge port of a rear average mechanism is communicated with nitrogen phosphorus vaporizer.
4. raising nitrophosphate fertilizer product P as claimed in claim 1
2o
5the system of water-soluble rate, it is characterized in that: described neutralising arrangement only has an average mechanism, described average mechanism is communicated with potassium sulfate solution dashpot with gas ammonia tank, ammonium nitrate storage tank, nitrocalcite filter respectively, and the discharge port of described average mechanism is communicated with nitrogen phosphorus vaporizer.
5. improve nitrophosphate fertilizer product P as claimed in claim 2 or claim 3
2o
5the system of water-soluble rate, is characterized in that: at least one average mechanism is made up of at least two neutralizing well parallel connections.
6. raising nitrophosphate fertilizer product P as claimed in claim 4
2o
5the system of water-soluble rate, is characterized in that: described average mechanism is made up of at least two neutralizing well parallel connections.
7. one kind is improved P in nitrophosphate fertilizer product
2o
5the method of water-soluble rate, first the acid hydrolysis solution that phosphorus ore and nitric acid solution produce is carried out sedimentation, discharge the acid non-soluble substance of lower floor, supernatant liquid forms nitrocalcite crystallization suspension through crystallization, then nitrocalcite crystallization suspension is carried out filtering the phosphoric acid mother liquor forming filter cake and filter out 65% ~ 75% nitrocalcite, by in mother liquor and after carry out nitrogen phosphorus evaporation concentration again, it is characterized in that: add potassium sulfate solution, gas ammonia and ammonium nitrate and carry out neutralization reaction in mother liquor and in workshop section.
8. P in raising nitrophosphate fertilizer product as claimed in claim 7
2o
5the method of water-soluble rate, is characterized in that: the mass percent concentration of described potassium sulfate solution is 50% ~ 60%, and the addition of described potassium sulfate solution is 2% ~ 15% of mother liquor transportation load.
9. P in raising nitrophosphate fertilizer product as claimed in claim 8
2o
5the method of water-soluble rate, is characterized in that: described gas ammonia comprises the gas ammonia reclaimed from nitrogen phosphorus slip concentration section.
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| CN107954749A (en) * | 2016-10-18 | 2018-04-24 | 贵州芭田生态工程有限公司 | Compound nitrogen phosphate fertilizer containing Quadrafos and preparation method thereof |
| CN108046864A (en) * | 2017-11-13 | 2018-05-18 | 兰小春 | Hydrochloric acid decomposes the method and device of low-grade phosphate ore production water soluble composite fertilizer |
| 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 |
| CN109251062A (en) * | 2018-10-17 | 2019-01-22 | 贵州芭田生态工程有限公司 | The nitrophosphate fertilizer and preparation method thereof of low water insoluble matter content |
| CN109279939A (en) * | 2018-10-17 | 2019-01-29 | 贵州芭田生态工程有限公司 | The method and compound fertilizer of compound fertilizer are prepared by phosphorus ore acid hydrolysis liquid |
| CN109293401A (en) * | 2018-10-17 | 2019-02-01 | 贵州芭田生态工程有限公司 | Efficiently separate method, mother liquor and the phosphate fertilizer preparation method of phosphorus ore acid hydrolysis insoluble matter |
| CN109293402A (en) * | 2018-10-17 | 2019-02-01 | 贵州芭田生态工程有限公司 | The method and nitrophosphate fertilizer of automated production nitrophosphate fertilizer |
| CN109485461A (en) * | 2018-10-17 | 2019-03-19 | 贵州芭田生态工程有限公司 | Phosphorus ore acid hydrolysis waste gas absorption and utilization method neutralize mother liquor and phosphate fertilizer preparation method |
| CN112758972A (en) * | 2021-01-04 | 2021-05-07 | 贵州芭田生态工程有限公司 | Method for preparing calcium sulfate, magnesium hydroxide and potassium magnesium nitrate from calcium-containing magnesium leaching solution |
| CN113603554A (en) * | 2021-07-30 | 2021-11-05 | 太原柏悟化工科技有限公司 | Production method of urea nitrophosphate fertilizer |
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