CN205258333U - System for improve water -soluble rate of nitrophosphate fertilizer product P2O5 - Google Patents
System for improve water -soluble rate of nitrophosphate fertilizer product P2O5 Download PDFInfo
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- CN205258333U CN205258333U CN201520831234.0U CN201520831234U CN205258333U CN 205258333 U CN205258333 U CN 205258333U CN 201520831234 U CN201520831234 U CN 201520831234U CN 205258333 U CN205258333 U CN 205258333U
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Abstract
The utility model discloses a system for improve water -soluble rate of nitrophosphate fertilizer product P2O5, including the acidolysis groove, sour insoluble matter subsider, the crystallizer, the calcium nitrate filter, neutrodyne system, the gas ammonia jar, the ammonium nitrate storage tank, calcium nitrate filter and potassium sulphide solution dashpot, nitrogen phosphorus evaporimeter, the horizontal granulator of biax, the desiccator, the shale shaker, a nitrogen phosphorus finished product cooler and a parcel section of thick bamboo, this system is with phosphorus ore acidolysis for the nitric acid, the sour insoluble matter of separation, the crystallization, filtration is carried out, the neutralization, the evaporation of nitrogen phosphorus, the granulation, it is dry, the screening, the cooling, packaging, add mother liquor and potassium sulphide in proportion in one section neutralizing tank, turn into calcium calcium sulfate with remaining few some ca2+, reduce the formation of sour hydrogen calcium salts of citric acid soluble phosphorus and infusibility phosphoric acid calcium salts, increase K+ in messenger's ground paste, production technology after this system of application is energy -concerving and environment -protective, when improving the water -soluble rate of finished product P2O5, to supplying the required nutrient element potassium of plant in the product, and reduce the material viscosity under the N -process low temperature state, promote the nitrophosphate fertilizer quality comprehensively.
Description
Technical field
The invention belongs to Phosphate Fertilizer Production field, particularly relate to a kind of system and technique that adopts indirect freezing method to produce the mother liquor ammonia neutralization of nitrophosphate fertilizer taking nitric acid and phosphorus ore as raw material, for improving nitrophosphate fertilizer product P2O5Water-soluble rate.
Background technology
Phosphate Fertilizer Production adopts indirect refrigeration deliming and double-shaft horizontal granulating 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, calcium nitrate Crystallization Separation, the neutralization of mother liquor ammonia, NP slip, dry, screening, packaging and calcium nitrate.
In Nitro Phosphate Unit N-process, owing to still containing higher Ca in phosphoric acid mother liquor2+With micro-Mg2+、Fe3+、Al3+And the impurity such as acid non-soluble substance, along with the carrying out of N-process, in and slip in can progressively generate the even insoluble phosphate of more slightly solubility, they are gelatinous tiny crystalline solid, thereby increase with phosphoric acid in causing, especially in and pH value reach 2.7 and at 4.5 o'clock, phosphoric acid will the value of peaking, in even can making, cannot carry out with technological operation, so, in phosphoric acid mother liquor and in process using normal pressure and groove type reactor, point three sections of neutralizations complete, in each section and the control of pH value be 1.6 ~ 2.0,2.8 ~ 3.2,5.6 ~ 6.0. But along with the raising of degree of neutralization, the portion phosphate that continues to generate will be changed into insoluble calcium phosphate, and Ca in mother liquor2+Higher, the insoluble calcium phosphate of generation is just more, causes the P in final products2O5Water-soluble rate reduce, affect the quality of product.
To have product design high except crystallization calcium nitrate technique for Phosphate Fertilizer Nitrate with Frozen Method, uses the advantages such as raw material is single, but it can only isolate 65% ~ 75% of total calcium in acidolysis slip, and deliming rate is not high enough, causes the P in nitrophosphate fertilizer final products2O5Water-soluble rate is lower, thereby has reduced P2O5Utilization rate. In nitrophosphate fertilizer target level of product quality (GB/T10510 ~ 2007), nitrophosphate fertilizer certified products P2O5Water-soluble rate index of performance is 40%, Grade A P2O5Water-soluble rate index is 55%, high-class product P2O5Water-soluble rate index also only has 70%, and P in certified products in ammonium phosphate product2O5Water-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 deliming technology, in conjunction with China's phosphorus ore feature, the utility model discloses a kind of nitrophosphate fertilizer product P that improves2O5The system of water-soluble rate, applies the energy-saving production technology environmental protection after this system, is improving finished product P2O5When water-soluble rate, in product, supplement the required nutrient potassium of plant, and reduce the material viscosity under N-process low-temperature condition, General Promotion nitrophosphate fertilizer quality.
The utility model is achieved by the following technical solution:
A kind of nitrophosphate fertilizer product P that improves2O5The system of water-soluble rate, comprising:
Acidolysis groove, for the acidolysis of raw material nitric acid and phosphorus ore, can select concentration is that 58% ~ 62% nitric acid and phosphorus ore carry out acidolysis, owing to containing the impurity such as iron, aluminium and silicon in phosphorus ore, produces acid non-soluble substance through acidolysis meeting;
Acid non-soluble substance subsider, described acid non-soluble substance subsider is communicated with acidolysis groove, for the acid hydrolysis solution overflowing from acidolysis groove is carried out to natural subsidence, discharges lower floor's acid non-soluble substance;
Crystallizer, described crystallizer is communicated with acid non-soluble substance subsider, for the supernatant liquor of acid non-soluble substance subsider is drained in crystallizer and carries out indirect heat exchange with cooling agent, makes acid hydrolysis solution crystallisation by cooling form calcium nitrate crystallization suspension;
Calcium nitrate filter, described calcium nitrate filter is communicated with crystallizer, for calcium nitrate crystallization suspension is filtered, and the treated ammonium nitrate that is converted into of calcium nitrate filter cake of formation, the filtrate separating after most of calcium nitrate forms mother liquor, and calcium nitrate fractional dose is about 65% ~ 75%;
Neutralising arrangement, described neutralising arrangement is communicated with gas ammonia tank, ammonium nitrate storage tank, calcium nitrate filter and potassium sulfate solution dashpot respectively, carries out neutralization reaction for mother liquor, potassium sulfate solution, gas ammonia, ammonium nitrate are introduced into neutralising arrangement;
Nitrogen phosphorus evaporimeter, for the slip of neutralising arrangement is drawn and carried out evaporation and concentration, and is communicated with by ammonia recovery unit the gas ammonia evaporating with neutralising arrangement;
Double-shaft horizontal comminutor, described double-shaft horizontal comminutor is communicated with nitrogen phosphorus evaporimeter, for slurry pipeline transport concentrated nitrogen phosphorus evaporimeter is carried out to granulation to double-shaft horizontal comminutor;
Drying machine, described drying machine is communicated with double-shaft horizontal comminutor, is dried for the nitrogen phosphorus particle that the granulation of double-shaft horizontal comminutor is produced;
Vibratory sieve, described vibratory sieve is communicated with drying machine and double-shaft horizontal comminutor respectively, for dried nitrogen phosphorus particle is sieved, out-of-size particle is returned to double-shaft horizontal comminutor and carry out granulation again;
Nitrogen phosphorus finished product cooler, described nitrogen phosphorus finished product cooler is communicated with vibratory sieve, carries out cooling for qualified nitrogen phosphorus particle transport to the nitrogen phosphorus finished product cooler of size that Vibration Screen is separated;
Parcel cylinder, described parcel cylinder is communicated with nitrogen phosphorus finished product cooler, for cooled nitrogen phosphorus granule packaging is obtained to finished product.
Consider the extent of reaction of technique and later stage evaporation, dry Cost Problems, generally the concentration of potassium sulfate solution be controlled to 50% ~ 60% and be advisable, and potassium sulfate solution addition be in ammonia and mother liquor operation total amount 2% ~ 15%.
As a kind of preferred embodiment, described neutralising arrangement comprises one section of average mechanism, comprise or do not comprise average mechanism again, described one section of average mechanism is communicated with gas ammonia tank, ammonium nitrate storage tank, calcium nitrate filter and potassium sulfate solution dashpot respectively, described average mechanism is again communicated with gas ammonia tank, ammonium nitrate storage tank respectively, described one section of average mechanism, average mechanism, the nitrogen phosphorus evaporimeter form connection to connect successively again; In the time that neutralising arrangement only includes one section of average mechanism and does not comprise average mechanism again, one section of average mechanism directly with the form connection of nitrogen phosphorus evaporimeter to connect, the solution that makes to flow out in one section of average mechanism is flowed directly to nitrogen phosphorus evaporimeter and carries out the evaporation of nitrogen phosphorus; In the time that neutralising arrangement not only comprises one section of average mechanism but also comprises average mechanism again, certainly average mechanism can be that one or more snippets point of average mechanism connected successively again, one section of average mechanism, again average mechanism and nitrogen phosphorus evaporimeter are connected successively, and the solution that makes to flow out in one section of average mechanism enters and after average mechanism neutralizes again, is drained to nitrogen phosphorus evaporimeter again and carries out the evaporation of nitrogen phosphorus.
As a kind of preferred embodiment, described neutralising arrangement comprises one section of average mechanism and average mechanism again, described average mechanism again comprises two sections of average mechanisms and three sections of average mechanisms, described two sections of average mechanisms and three sections of average mechanisms respectively with gas ammonia tank, ammonium nitrate storage tank is communicated with, described one section of average mechanism, two sections of average mechanisms, three sections of average mechanisms, nitrogen phosphorus evaporimeter is communicated with the form of series connection successively, , described mother liquor and potassium sulfate solution after calcium nitrate filter filters only joins in one section of average mechanism, described gas ammonia and ammonium nitrate join respectively one section of average mechanism, in two sections of average mechanisms and three sections of average mechanisms.
Certainly gas ammonia used can comprise the gas ammonia reclaiming from nitrogen phosphorus slip concentration section in mother liquor ammonia and in workshop section.
Owing to removing and containing H in mother liquor3PO4、HNO3Also contain higher Ca (NO outward,3)2With micro-Mg (NO3)2、Fe(NO3)3、Al(NO3)3And number acid insoluble matter, in neutralising arrangement, make the Ca (NO of the overwhelming majority in one section of neutralization chamber3)2With K2SO4Reaction generates sl. sol. CaSO4, make the Ca in neutralising arrangement2+Amount little, change into CaHPO4And Ca3(PO4)2Seldom, improve P in finished product2O5Water-soluble rate, promotes P2O5Utilization rate;
If the neutralising arrangement of the technical program adopts one, two, three section of average mechanism to connect successively, the pH value in one, two, three section of average mechanism can be controlled is 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 successively following chemical reaction:
First in first paragraph and time, nitric acid and phosphoric acid in gas ammonia and mother liquor react, and generate ammonium nitrate and MAP, reaction equation is:
Ca(NO3)2+K2SO4=CaSO4+2KNO3
NH3+HNO3=NH4NO3
NH3+H3PO4=NH4H2PO4
In and second segment, MAP continues to react with gas ammonia, generates Diammonium phosphate (DAP), reaction equation is:
NH4H2PO4+NH3=(NH4)2HPO4
More than reaction is the main reaction of N-process, in there is main reaction, MAP again with mother liquor in Ca (NO3)2And Mg (NO3)2A series of side reactions occur, and reaction equation is as follows:
2NH4H2PO4+Ca(NO3)2=Ca(H2PO4)2+2NH4NO3
2NH4H2PO4+Mg(NO3)2=Mg(H2PO4)2+2NH4NO3
Be neutralized to the 3rd section if continue, one-lime phosphate and phosphoric acid one magnesium can transform again and generate Dicalcium Phosphate and di(2-ethylhexyl)phosphate magnesium, and reaction equation is:
Ca(H2PO4)2+Ca(NO3)2+2NH3=2CaHPO4+2NH4NO3
Mg(H2PO4)2+Mg(NO3)2+2NH3=2MgHPO4+2NH4NO3
Go down if continue neutralization, dicalcium and two magnesium change into again DFP and three magnesium, and reaction equation is:
2CaHPO4+Ca(NO3)2+2NH3=Ca3(PO4)2+2NH4NO3
2MgHPO4+Ca(NO3)2+2NH3=Mg3(PO4)2+2NH4NO3
Along with the carrying out of N-process, in and slip in can progressively generate the even insoluble hydrophosphate of more slightly solubility and phosphoric acid normal salt, make the P of final finished2O5Water-soluble rate reduces, and affects end product quality, therefore, makes Ca in mother liquor2+, especially enter in two, three sections of average mechanisms Ca in slip2+Content more low better, in one section of average mechanism of the technical program, introduce potassium sulfate solution, make in one section of average mechanism the Ca (NO of the overwhelming majority3)2With K2SO4Reaction generates sl. sol. CaSO4, make to enter Ca in two, three sections of average mechanisms2+Amount little, change into CaHPO4And Ca3(PO4)2Seldom, improve P in finished product2O5Water-soluble rate, promotes P2O5Utilization rate.
As a kind of preferred embodiment, described one section of average mechanism is made up of 1 one section of neutralization chamber.
As a kind of preferred embodiment, described one section of average mechanism is made up of at least 2 one section of neutralization chamber parallel connections, and described each section of neutralization chamber is communicated with gas ammonia tank, ammonium nitrate storage tank, calcium nitrate filter and potassium sulfate solution dashpot respectively.
As a kind of preferred embodiment, described one section of average mechanism, two sections of average mechanisms, three sections of average mechanisms are made up of 1 one section of neutralization chamber, two sections of neutralization chambers, three sections of neutralization chambers respectively, and described one section of neutralization chamber, two sections of neutralization chambers, three sections of neutralization chambers are communicated with the form of connecting successively with nitrogen phosphorus evaporimeter.
As a kind of preferred embodiment, in described one section of average mechanism, two sections of average mechanisms, three sections of average mechanisms, having 1 average mechanism at least is by being communicated with the form of connecting successively with adjacent N section average mechanism (N is, two or three) or nitrogen phosphorus evaporimeter after at least 2 neutralization chamber parallel connections again.
Compared with prior art the present invention has following features:
(1) potassium sulfate solution adds one section of neutralization chamber of neutralization, the reaction mechanism different with segmentation reaction product in utilization, by the residual small part calcium nitrate in mother liquor component and potassium sulfate in first paragraph neutralization reaction, form calcium sulfate, reduce in mother liquor residual calcium nitrate in the 3rd section and time reacting dose;
(2) the potassium sulfate solution addition of control 50% ~ 60% concentration is to move 2% ~ 15% of total amount with mother liquor in ammonia, both retained the intrinsic characteristic of Phosphate Fertilizer Nitrate with Frozen Method product, in final products, also increased the distinctive nutrient potassium of plant, plant can obtain more trace element simultaneously;
(3) utilize the peculiar low viscosity characteristics of moisture content in the potassium sulfate solution of 50% ~ 60% concentration, by adding one section of neutralization, reduced in one, two, three section of low temperature and the viscosity of material;
(4) potassium sulfate is mixed with potassium sulfate solution, is convenient to remote high-storey and carries, and has solved the little limitation in old plant modification space, increases potassium sulfate solution storage tank simultaneously, has ensured that potassium sulfate adds continually and steadily.
Adopt the not only energy-conserving and environment-protective of technique of system of the present invention, can also improve final products P2O5When water-soluble rate, realize in product and supplement the required nutrient potassium of plant and reduce the material viscosity under N-process low-temperature condition, can General Promotion Nitro Phosphate Unit final products P2O5Water-soluble rate and nitrophosphate fertilizer quality, P in final finished2O5Water-soluble rate has been brought up to more than 70% by original 40% ~ 55%, even can reach more than 85%.
Brief description of the drawings
Fig. 1 is the integrated artistic flow chart of the utility model embodiment 1.
Fig. 2 is the integrated artistic flow chart of the utility model embodiment 2.
Fig. 3 is the integrated artistic flow chart of the utility model embodiment 3 ~ 4.
In figure: 1. acidolysis groove, 2. acid non-soluble substance subsider, 3. crystallizer, 4. calcium nitrate filter, 5. one section of neutralization chamber, 6. two sections of neutralization chambers, 7. three sections of neutralization chambers, 8. nitrogen phosphorus evaporimeter, 9. double-shaft horizontal comminutor, 10. drying machine, 11. vibratory sieves, 12. nitrogen phosphorus finished product coolers, 13. parcel cylinders, 14. ammonia recovery units, 15. gas ammonia tanks, 16. ammonium nitrate storage tanks, 17. potassium sulfate solution dashpots.
Detailed description of the invention
Now the utility model is further explained to explanation in conjunction with the embodiments.
Embodiment 1
Improve nitrophosphate fertilizer product P2O5The system of water-soluble rate, the nitric acid that is 62% by concentration and phosphorus ore carry out acidolysis in acidolysis groove, owing to containing the impurity such as iron, aluminium and silicon in phosphorus ore, produce acid non-soluble substance through acidolysis meeting, the acid hydrolysis solution overflowing in acidolysis groove is drained to and in acid non-soluble substance subsider, carries out natural subsidence, and lower floor's acid non-soluble substance is discharged after collecting, and supernatant liquor flow in crystallizer, and the ammoniacal liquor that is 20% by mass fraction is made cooling agent and acid hydrolysis solution, and to carry out heat exchange crystallization cooling, calcium nitrate crystallization suspension after crystallization is drained in calcium nitrate filter from crystallizer, be converted into ammonium nitrate by filtering the calcium nitrate filter cake forming through PROCESS FOR TREATMENT, to separate the mother liquor that forms after 75% calcium nitrate and account for mother liquor operation total amount and be about the potassium sulfate solution that 2% concentration is 50% and introduce neutralising arrangement, this neutralising arrangement only has one section of neutralization chamber, material flow in one section of neutralization chamber is through nitrogen phosphorus evaporimeter, the gas ammonia evaporating in nitrogen phosphorus evaporimeter enters ammonia recovery unit, ammonia in ammonia recovery unit, gas ammonia in gas ammonia tank, ammonium nitrate in nitric acid ammonia storage tank enters one section of neutralization chamber and reacts, slip in ammonia phosphorus evaporimeter is, bolting dry through double-shaft horizontal granulator granulation, drying machine successively after concentrated, out-of-size particle is returned to double-shaft horizontal comminutor and carry out granulation again, by finished particle qualified size deliver to nitrogen phosphorus finished product cooler cooling, parcel barrier packaging obtain finished product, the P of finished product2O5Water-soluble rate can reach 70%.
Embodiment 2
Improve nitrophosphate fertilizer product P2O5The system of water-soluble rate, the nitric acid that is 60% by concentration and phosphorus ore carry out acidolysis in acidolysis groove, owing to containing the impurity such as iron, aluminium and silicon in phosphorus ore, produce acid non-soluble substance through acidolysis meeting, the acid hydrolysis solution overflowing in acidolysis groove is drained to and in acid non-soluble substance subsider, carries out natural subsidence, and lower floor's acid non-soluble substance is discharged after collecting, and supernatant liquor flow in crystallizer, and the ammoniacal liquor that is 20% by mass fraction is made cooling agent and acid hydrolysis solution, and to carry out heat exchange crystallization cooling, calcium nitrate crystallization suspension after crystallization is drained in calcium nitrate filter from crystallizer, be converted into ammonium nitrate by filtering the calcium nitrate filter cake forming through PROCESS FOR TREATMENT, to separate the mother liquor that forms after 70% calcium nitrate and account for mother liquor operation total amount and be about the potassium sulfate solution that 8% concentration is 55% and introduce neutralising arrangement, this neutralising arrangement is made up of one section of neutralization chamber and two sections of neutralization chambers, material in one section of neutralization chamber flow through successively two sections of neutralization chambers and nitrogen phosphorus evaporimeter, the gas ammonia evaporating in nitrogen phosphorus evaporimeter enters ammonia recovery unit, ammonia in ammonia recovery unit, gas ammonia in gas ammonia tank, ammonium nitrate in nitric acid ammonia storage tank enters respectively one section of neutralization chamber and two sections of neutralization chambers react, slip in ammonia phosphorus evaporimeter is, bolting dry through double-shaft horizontal granulator granulation, drying machine successively after concentrated, out-of-size particle is returned to double-shaft horizontal comminutor and carry out granulation again, by finished particle qualified size deliver to nitrogen phosphorus finished product cooler cooling, parcel barrier packaging obtain finished product, the P of finished product2O5Water-soluble rate can reach 75%.
Embodiment 3
Improve nitrophosphate fertilizer product P2O5The system of water-soluble rate, the nitric acid that is 60% by concentration and phosphorus ore carry out acidolysis in acidolysis groove, owing to containing the impurity such as iron, aluminium and silicon in phosphorus ore, produce acid non-soluble substance through acidolysis meeting, the acid hydrolysis solution overflowing in acidolysis groove is drained to and in acid non-soluble substance subsider, carries out natural subsidence, and lower floor's acid non-soluble substance is discharged after collecting, and supernatant liquor flow in crystallizer, and the ammoniacal liquor that is 20% by mass fraction is made cooling agent and acid hydrolysis solution, and to carry out heat exchange crystallization cooling, calcium nitrate crystallization suspension after crystallization is drained in calcium nitrate filter from crystallizer, be converted into ammonium nitrate by filtering the calcium nitrate filter cake forming through PROCESS FOR TREATMENT, be 11% by separating the mother liquor forming after 72% calcium nitrate with accounting for mother liquor operation total amount, concentration is that 58% potassium sulfate solution is introduced in one section of neutralization chamber of neutralising arrangement, described neutralising arrangement is by one, two, three sections of neutralization chamber formations, material in the one section of neutralization chamber two sections of neutralization chambers of flowing through successively, three sections of neutralization chambers and nitrogen phosphorus evaporimeter, the gas ammonia evaporating in nitrogen phosphorus evaporimeter enters ammonia recovery unit, ammonia in ammonia recovery unit, gas ammonia in gas ammonia tank, ammonium nitrate in nitric acid ammonia storage tank enters respectively one section of neutralization chamber, two sections of neutralization chambers, three sections of neutralization chambers react, and by one, two, it is 2.0 that pH value in three sections of neutralization chambers is controlled, 3.2, 6.0, slip in ammonia phosphorus evaporimeter is, bolting dry through double-shaft horizontal granulator granulation, drying machine successively after concentrated, out-of-size particle is returned to double-shaft horizontal comminutor and carry out granulation again, by finished particle qualified size deliver to nitrogen phosphorus finished product cooler cooling, parcel barrier packaging obtain finished product, the P of finished product2O5Water-soluble rate can reach 85%.
Embodiment 4
Improve nitrophosphate fertilizer product P2O5The system of water-soluble rate, the nitric acid that is 58% by concentration and phosphorus ore carry out acidolysis in acidolysis groove, owing to containing the impurity such as iron, aluminium and silicon in phosphorus ore, produce acid non-soluble substance through acidolysis meeting, the acid hydrolysis solution overflowing in acidolysis groove is drained to and in acid non-soluble substance subsider, carries out natural subsidence, and lower floor's acid non-soluble substance is discharged after collecting, and supernatant liquor flow in crystallizer, and the ammoniacal liquor that is 20% by mass fraction is made cooling agent and acid hydrolysis solution, and to carry out heat exchange crystallization cooling, calcium nitrate crystallization suspension after crystallization is drained in calcium nitrate filter from crystallizer, be converted into ammonium nitrate by filtering the calcium nitrate filter cake forming through PROCESS FOR TREATMENT, be 15% by separating the mother liquor forming after 65% calcium nitrate with accounting for mother liquor operation total amount, concentration is that 60% potassium sulfate solution is introduced in one section of neutralization chamber of neutralising arrangement, described neutralising arrangement is by one, two, three sections of neutralization chamber formations, material in the one section of neutralization chamber two sections of neutralization chambers of flowing through successively, three sections of neutralization chambers and nitrogen phosphorus evaporimeter, the gas ammonia evaporating in nitrogen phosphorus evaporimeter enters ammonia recovery unit, ammonia in ammonia recovery unit, gas ammonia in gas ammonia tank, ammonium nitrate in nitric acid ammonia storage tank enters respectively one section of neutralization chamber, two sections of neutralization chambers, three sections of neutralization chambers react, and by one, two, it is 1.8 that pH value in three sections of neutralization chambers is controlled, 3.0, 5.8, slip in ammonia phosphorus evaporimeter is, bolting dry through double-shaft horizontal granulator granulation, drying machine successively after concentrated, out-of-size particle is returned to double-shaft horizontal comminutor and carry out granulation again, by finished particle qualified size deliver to nitrogen phosphorus finished product cooler cooling, parcel barrier packaging obtain finished product, the P of finished product2O5Water-soluble rate can reach 80%.
Claims (7)
1. one kind is improved nitrophosphate fertilizer product P2O5The system of water-soluble rate, is characterized in that comprising:
Acidolysis groove, for the acidolysis of raw material nitric acid and phosphorus ore;
Acid non-soluble substance subsider, is communicated with acidolysis groove;
Crystallizer, is communicated with acid non-soluble substance subsider;
Calcium nitrate filter, is communicated with crystallizer, and calcium nitrate crystallization suspension is filtered, and forms calcium nitrate filter cake and mother liquor;
Neutralising arrangement, is communicated with gas ammonia tank, ammonium nitrate storage tank, calcium nitrate filter and potassium sulfate solution dashpot;
Nitrogen phosphorus evaporimeter;
Double-shaft horizontal comminutor, is communicated with nitrogen phosphorus evaporimeter;
Drying machine, is communicated with double-shaft horizontal comminutor;
Vibratory sieve, is communicated with drying machine and double-shaft horizontal comminutor;
Nitrogen phosphorus finished product cooler, described nitrogen phosphorus finished product cooler is communicated with vibratory sieve, and qualified nitrogen phosphorus particle transport to the nitrogen phosphorus finished product cooler of size that Vibration Screen is separated carries out cooling;
Parcel cylinder, described parcel cylinder is communicated with nitrogen phosphorus finished product cooler, and cooled nitrogen phosphorus granule packaging is obtained to finished product.
2. raising nitrophosphate fertilizer product P as claimed in claim 12O5The system of water-soluble rate, it is characterized in that: described neutralising arrangement comprises one section of average mechanism, comprise or do not comprise average mechanism again, described one section of average mechanism is communicated with gas ammonia tank, ammonium nitrate storage tank, calcium nitrate filter and potassium sulfate solution dashpot respectively, described average mechanism is again communicated with gas ammonia tank, ammonium nitrate storage tank respectively, described one section of average mechanism, average mechanism, the nitrogen phosphorus evaporimeter form connection to connect successively again.
3. raising nitrophosphate fertilizer product P as claimed in claim 22O5The system of water-soluble rate, it is characterized in that: described neutralising arrangement comprises one section of average mechanism and average mechanism again, described average mechanism is again made up of two sections of average mechanisms and three sections of average mechanisms, described two sections of average mechanisms and three sections of average mechanisms are communicated with gas ammonia tank, ammonium nitrate storage tank respectively, and described one section of average mechanism, two sections of average mechanisms, three sections of average mechanisms, nitrogen phosphorus evaporimeters are communicated with the form of series connection successively.
4. raising nitrophosphate fertilizer product P as claimed in claim 22O5The system of water-soluble rate, is characterized in that: described one section of average mechanism is made up of 1 one section of neutralization chamber.
5. raising nitrophosphate fertilizer product P as claimed in claim 22O5The system of water-soluble rate, is characterized in that: described one section of average mechanism is made up of at least 2 one section of neutralization chamber parallel connections, and described each section of neutralization chamber is communicated with gas ammonia tank, ammonium nitrate storage tank, calcium nitrate filter and potassium sulfate solution dashpot respectively.
6. raising nitrophosphate fertilizer product P as claimed in claim 32O5The system of water-soluble rate, it is characterized in that: described one section of average mechanism, two sections of average mechanisms, three sections of average mechanisms are made up of 1 one section of neutralization chamber, two sections of neutralization chambers, three sections of neutralization chambers respectively, described one section of neutralization chamber, two sections of neutralization chambers, three sections of neutralization chambers are communicated with the form of connecting successively with nitrogen phosphorus evaporimeter.
7. raising nitrophosphate fertilizer product P as claimed in claim 32O5The system of water-soluble rate, is characterized in that: in described one section of average mechanism, two sections of average mechanisms, three sections of average mechanisms, having 1 average mechanism at least is by being communicated with the form of connecting successively with adjacent segment average mechanism or nitrogen phosphorus evaporimeter after at least 2 neutralization chamber parallel connections again.
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