CN107721730A - A kind of preparation method of acidic fertilizier - Google Patents
A kind of preparation method of acidic fertilizier Download PDFInfo
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- CN107721730A CN107721730A CN201710938939.6A CN201710938939A CN107721730A CN 107721730 A CN107721730 A CN 107721730A CN 201710938939 A CN201710938939 A CN 201710938939A CN 107721730 A CN107721730 A CN 107721730A
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- 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
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
Abstract
The present invention relates to a kind of preparation method of acidic fertilizier, including：By phosphoric acid, the blend step of urea；Mixed reactions steps；It is granulated, baking step.Contain urea phosphate and ammonium hydrogen sulfate in the acidic fertilizier of the present invention, pH is 2.5 3.5, the pH value in basic soil can be reduced, so as to reduce the volatilization loss of ammonium nitrogen in alkaline soils, the stability of amidonitrogen can be increased in addition, activation can be played to phosphorus and middle trace element in addition, simultaneously, phosphorus can be avoided to be fixed by elements such as calcium, magnesium, increase the locomotivity of phosphorus；But when pH value is less than 2.5, product viscosity is excessive, the easy moisture absorption, and the pH value of soil can not be effectively reduced when pH is too high, is unable to reach activation phosphorus and middle micro- purpose.
Description
Technical field
The present invention relates to fertilizer field, more particularly to a kind of preparation method of acidic fertilizier, belong to technical field of fertilizers.
Background technology
China is northern and coastal region, be dispersed with the higher basic soils of a large amount of pH, soil physical and chemical property is poor, phosphoric acid and
Calcium or iron, aluminium easily form effect state late, and phosphorus nutrient reduces, and the solubility of the element such as calcium, magnesium, iron, zinc and boron, manganese, copper is all
It is very low, show as middle microelement deficiencies.It is serious due to alkaline to lack phosphorus phenomenon, so alkalescence ground region peasant household uses phosphoric acid one
The dosage of ammonium and Diammonium phosphate (DAP) is larger, and the utilization rate of phosphorus is very low, causes fertilizer waste and crop failure.
Diammonium phosphate (DAP) belongs to the quick-acting composite fertilizers of binary, contains nutrient necessary to nitrogen, the plant growth of phosphorus two.But in recent years
Production capacity surplus be present, the predicament of the serious saturation in market, production of phosphate fertilizer technique is optimized, expand product type, improve production
Quality, solve the problems, such as that diammonium phosphate product is low in the regional efficiency of alkalescence, by as following outlet of phosphate fertilizer industry.
In view of phosphorus utilization is low in alkaline soil, crop existing growth disorder, therefore acidic fertilizier should in alkaline soils
Transport and give birth to.
Chinese patent literature CN1123265A (application number CN95112237.1) discloses a kind of highly acid organic and inorganic compound
Multi-purpose fertilizer is closed, above fertilizer, the ridging nursery of flowers gourd, fruit and vegetable and rice industrial sprout cultivation are inserted for salt-soda soil dry land base manure, paddy field
Seedling bed regulating acid etc..It is characterized in that the multi-purpose composite fertilizer by concentrated acid, plant and animal residues powder, water and chemical fertilizer according to certain ratio phase
Mix.But this fertilizer is liquid fertilizer, it is difficult to transport and use, is unfavorable for huge construction program popularization and application.
Chinese patent literature CN102442864A (application number CN201110286421.1), which discloses one kind, can decompose soil
The acidic fertilizier of phosphorus potassium and trace element in earth, by 1~9 part of sulfuric acid, phosphatase 11~8 part, 3~16 parts of ammonium sulfate, 1~3 part of liquefied ammonia
The mixture of sulfuric phosphoric acid sulphur ammonium fertilizer of composition, although effectively reducing the influence of soil Minerals solid film layer, effectively improve anti-
Thing and product are answered by the diffusion velocity of solid film layer, decomposition phosphorus, potassium and trace element is easily carried out, sulfuric acid is used with phosphoric acid
Available phosphorus, potassium and trace element required for decomposing the invalid phosphorus in soil, potassium and trace element and being plant growth, ammonium sulfate
For nitrogenous fertilizer, but contain sulfuric acid in sulphur phosphoric acid mixing acid sulphur ammonium fertilizer, and the granulated fertilizer viscosity containing sulfuric acid is very big, is not easy to dry.
It is special that Chinese patent literature CN102503719A (application number CN201110309425.7) discloses a kind of basic soil
With the preparation method of strong-acidic water-soluble fertilizer, be ureasulfuric acid slurry and powder MAP are mixed to get admittedly by liquid half into
Product；Semi-finished product by drying, crush, sieve and produce strong-acidic water-soluble fertilizer special for alkaline soil, the production as obtained by the above method
Product are MAP (NH4H2PO4), the compound of ureasulfuric acid (CO (NH2) 2.H2SO4), and its free water is less than 2%.The invention
Although reducing the moisture absorption of urea phosphate by the compounding with MAP, it is hardened that the product after being granulated still has the easy moisture absorption
The problems such as.
Although the pH value for the improvement saline-alkali soil that above acidic fertilizier can be in various degree.But how one kind is provided and is produced into
This is relatively low, convenient storage and transport, and the acidic fertilizier that can effectively improve saline-alkali soil also needs to Devoting Major Efforts To Developing research.
The content of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of production cost is relatively low, and the convenient storage of products obtained therefrom, transport
Acidic fertilizier preparation method, this method production fertilizer simultaneously urea phosphate and ammonium hydrogen sulfate be present, soil pH value can be reduced,
Volatilization loss and the phosphorus fixation loss of ammonium nitrogen are reduced, the utilization rate of fertilizer can be effectively improved, increase crop yield.
Technical scheme is as follows：
A kind of preparation method of acidic fertilizier, including：
By raw material phosphoric acid, the blend step of urea；
Mixed reactions steps；
It is granulated, baking step.
Preparation in accordance with the present invention, it is preferred that in raw material blend step, phosphoric acid is with P2O5Meter, urea is with urea molecule
Meter, wherein, phosphoric acid：The mol ratio of urea is 1：(0.3-1.4), further preferred 1：(0.8-1.2).
Preparation in accordance with the present invention, it is preferred that in raw material blend step, controlled in the mixed slurry of phosphoric acid and urea
P2O5Weight/mass percentage composition is 34%-42%；Further preferred 36%-40%.
Preparation in accordance with the present invention, it is preferred that in blend step, selectively add and account for fertilizer product mass fraction
0.01-2% trace elements, wherein in the micro- raw material, copper preferably sulfuric acid copper and/or EDTA chelated coppers, boron
Element preferred boric acid, Zn-ef ficiency preferably sulfuric acid zinc and/or EDTA chelated zincs, ferro element preferably sulfuric acid is ferrous and/or EDTA is chelated
Ferrous, manganese element preferably sulfuric acid manganese and/or the preferred ammonium molybdate of EDTA Chelated Manganeses, molybdenum element.
Preparation in accordance with the present invention, it is preferred that in blend step, selectively add and account for fertilizer product mass fraction 5-
The 10% soil improvement factor, wherein the described soil improvement factor is humic acid and/or alginic acid and/or poly-aspartate, make
For the mixture that the preferable soil improvement factor is humic acid, alginic acid, poly-aspartate, wherein alginic acid, humic acid and poly-
The mass ratio of the addition of aspartic acid is preferably 1~4：5~10：2~6, further preferred 2~3：6~9：4~5.
The preparation method of the present invention, P in control system2O5With CO (NH2)2The importance of mol ratio：Wherein phosphoric acid and urea
Urea phosphate is formed, urea phosphate can be complexed impurity present in phosphoric acid by wet process, ensure that reacts is smoothed out, and P2O5With CO
(NH2)2Mol ratio is 1：0.3-1.4 the, if CO (NH added2)2Excessively, then it is tacky to be easily caused material, influences entirely to prepare
Material transportation in journey, in addition urea can be decomposed in concentration and produce a large amount of bubbles, influence being normally carried out for course of reaction, if
CO (the NH of addition2)2It is very few, because of impurity effect in system, it is unfavorable for the progress of reaction.
Preferably, sulfuric acid and ammonia are each led into reactions steps, into system, nitrogen sulfur content and pH in regulation system；
The preferred ammonia of wherein described ammonia and anhydrous liquid ammonia.
, according to the invention it is preferred to, in reactions steps, reaction temperature is 130-220 DEG C；The height of reaction temperature is by anti-
Should in the amount of sulfuric acid that is passed through control.
, according to the invention it is preferred to, in reactions steps, it can be reacted by tubular reactor, reaction time 0.5s-
2s。
It is further preferred that the addition control of sulfuric acid exists：P in phosphoric acid in system2O5：The mol ratio of sulfate radical in sulfuric acid
For 1：1-2, further preferred 1：1.2-1.6.
Further optimize, by controlling the intake of ammonia, control product pH value is in 2.5-3.5.
Preparation in accordance with the present invention, it is preferred that reactions steps are completed, and obtain acid acidic fertilizier feed liquid；Acid feed liquid
Through granulation, baking step, acidic fertilizier is obtained.
Preparation in accordance with the present invention, it is preferred that after the completion of reaction, trace element is added in granulation process.
Preparation in accordance with the present invention, it is preferred that after the completion of reaction, in granulation process add poly-aspartate or/
With humic acid or/and alginic acid.
Preparation in accordance with the present invention, it is preferred that described phosphoric acid is phosphoric acid by wet process；It is further preferred that the phosphorus
Acid is with P2O5The mass percent concentration of meter is 30%-47%.
The present invention by Optimizing Technical and parameter, can serialization large-scale production acidic fertilizier, the fertilizer contains
Orthophosphates and Quadrafos, and ammonium nitrogen and amidonitrogen.
Contain urea phosphate and ammonium hydrogen sulfate in the acidic fertilizier of the present invention, pH 2.5-3.5, can reduce in basic soil
PH value, the volatilization loss of ammonium nitrogen in alkaline soils can be reduced, increase the stability of amidonitrogen, phosphorus in activating soil,
And middle trace element, avoid phosphorus from being fixed by elements such as calcium, magnesium, increase the locomotivity of phosphorus, but when pH value is less than 2.5, product
Viscosity is excessive, the easy moisture absorption, and the pH value of soil can not be effectively reduced when pH is too high, is unable to reach activation phosphorus and middle trace element
Purpose, in addition the APP in this product there is good stability, micro member in being effectively complexed in alkaline soils
Element, while the present invention can add appropriate middle trace element, provide comprehensive nutrient for crop, the present invention can add soil in addition
Earth improves combinations of factors, and soil improvement combinations of factors of the invention can effectively be complexed calcium, magnesium and micro member in basic soil
Element, water soluble complex is formed, three kinds of compositions in the soil improvement factor form three kinds of crumb structure with optimal proportion in addition, no
With slight void can be formed between crumb structure, so as to effective improved soil structure and environment.
The device have the advantages that：
1st, the acidic fertilizier prepared by preparation method of the invention, has orthophosphates addition polymerization phosphate, ammonium nitrogen adds acyl
The nutrient composition of amine state nitrogen, determines the characteristics of there is the product quick-acting lengthen to imitate, and fertilizer efficiency is high, and carrying out experiment on wheat shows
Than the ammonium of application of phosphoric acid two volume increase more than 8%, obvious effect of increasing production of losing weight.
2nd, contain urea phosphate and ammonium hydrogen sulfate in acidic fertilizier of the invention, pH 2.5-3.5, can reduce in basic soil
PH value, so as to reduce the volatilization loss of ammonium nitrogen in alkaline soils, the stability of amidonitrogen can be increased in addition, in addition may be used
Activation is played to phosphorus and middle trace element, meanwhile, phosphorus can be avoided to be fixed by elements such as calcium, magnesium, increase the locomotivity of phosphorus；
But when pH value is less than 2.5, product viscosity is excessive, the easy moisture absorption, and the pH value of soil can not be effectively reduced when pH is too high, can not
Reach activation phosphorus and middle micro- purpose.
3rd, the preparation technology of acidic fertilizier of the invention is simple, and cost is low, and continuous large-scale production can be achieved.
Brief description of the drawings
Fig. 1 is the production technological process of acidic fertilizier in embodiment 4.
Embodiment
With reference to embodiment, the present invention is expanded on further.It should be understood that these embodiments be merely to illustrate the present invention without
For limiting the scope of the present invention.
Unless otherwise indicated, the raw material in embodiment is commercial products, and reagent concentration and mineralogical composition content are matter
Measure percentage.
Phosphoric acid used is phosphoric acid by wet process in embodiment, and wherein phosphoric acid concentration is (with P2O5Meter) it is 31.2%, its Testing index
It is shown in Table 1.
Table 1：With P2O5Count the assay that concentration is 31.2% phosphoric acid by wet process
| P2O5 | SO4 2- | MgO | Al2O3 | SiO2 | CaO | Fe2O3 |
| 31.20% | 2.31% | 1.07% | 1.62% | 0.51% | 0.18% | 0.85% |
In embodiment 1-5, material proportion in raw material and preparation system：Phosphoric acid is with P2O5Meter, urea is with CO (NH2)2Meter,
Sulfuric acid is in terms of sulfate radical." % " is weight/mass percentage composition unless otherwise specified.
Embodiment 1
A kind of preparation method of acidic fertilizier, comprises the following steps：
(1) phosphoric acid and urea are added in mixing channel I, control P in acid solution2O5With CO (NH2)2Mol ratio is 1：0.7,
Obtain mixing A after well mixed；
(2) the mixed slurry A obtained in step (1) is pumped into thickener at 85 DEG C to be concentrated, controls P2O5Quality hundred
It is 36% to divide than content, and enriching slurry B is obtained after concentration；
(3) the slurry B obtained in step (2) is pumped into mixing channel II, urea is added into mixing channel II, control acid solution
Middle P2O5With total CO (NH2)2Mol ratio is 1：1.4, obtain mixed slurry C
(4) the slurry C obtained in step (3) is passed through tubular reactor, adds sulfuric acid, and be passed through ammonia, control P2O5With
The mol ratio of sulfate radical is 1：1, pH=2-3.5,155-165 DEG C of temperature, after reaction completely, obtain slurry D；
(5) the slurry D obtained in step (4) is sprayed into comminutor and carries out slurry-spraying pelletizing, then transport to dryer
Row drying, is then sieved, packaging and storage, defective work are back to granulation to certified products as returning charge after crushing after cooling
Circulation production is carried out in machine.
Product nutrient testing result：P2O534.38%, wherein, polymeric form phosphorus is with P2O5Meter 2.69%；Amidonitrogen
3.28%, ammonium nitrogen 12.61%, total N17.08%, S7.79%, pH=3.3.
Embodiment 2
A kind of preparation method of acidic fertilizier, comprises the following steps：
(1) phosphoric acid and urea are added in mixing channel I, control P in acid solution2O5With CO (NH2)2Mol ratio is 1：0.2,
Obtain mixing A after well mixed；
(2) the mixed slurry A obtained in step (1) is pumped into thickener at 85 DEG C to be concentrated, controls P2O5Quality hundred
It is 41% to divide than content, and enriching slurry B is obtained after concentration；
(3) the slurry B obtained in step (2) is pumped into mixing channel II, urea is added into mixing channel II, control acid solution
Middle P2O5With total CO (NH2)2Mol ratio is 1:0.6, obtain mixed slurry C；
(4) the slurry C obtained in step (3) is passed through tubular reactor, adds sulfuric acid, and be passed through ammonia, control P2O5With
The mol ratio of sulfate radical is 1：1.7, pH=2-3.5,170-175 DEG C of temperature, after reaction completely, obtain slurry E；
(5) the slurry D obtained in step (4) is sprayed into comminutor and carries out slurry-spraying pelletizing, then transport to dryer
Row drying, is then sieved, packaging and storage, defective work are back to granulation to certified products as returning charge after crushing after cooling
Circulation production is carried out in machine.
Product nutrient testing result：P2O529.64%, wherein, polymeric form phosphorus is with P2O5Meter 3.61%；Amidonitrogen
1.18%, ammonium nitrogen 14.64%, total N15.82%, S11.19%.
Embodiment 3
A kind of preparation method of acidic fertilizier, comprises the following steps：
(1) phosphoric acid and urea are added in mixing channel I, control P in acid solution2O5With CO (NH2)2Mol ratio is 1：0.3,
Obtain mixing A after well mixed；
(2) the mixed slurry A obtained in step (1) is pumped into thickener at 90 DEG C to be concentrated, controls P2O5Quality hundred
It is 41.5% to divide than content, and enriching slurry B is obtained after concentration；
(3) the slurry B obtained in step (2) is passed through tubular reactor, adds sulfuric acid, and be passed through ammonia, control P2O5With
The mol ratio of sulfate radical is 1：1.5, pH=2-3.5,160-170 DEG C of temperature, after reaction completely, obtain slurry C；
(4) the slurry C obtained in step (3) is sprayed into comminutor and carries out slurry-spraying pelletizing, then transport to dryer
Row drying, is then sieved, packaging and storage, defective work are back to granulation to certified products as returning charge after crushing after cooling
Circulation production is carried out in machine.
Product nutrient testing result：P2O531.85%, wherein, polymeric form phosphorus is with P2O5Meter 3.42%；Amidonitrogen
0.64%, ammonium nitrogen 14.91%, total N15.55%, S10.69%.
Embodiment 4
A kind of preparation method of acidic fertilizier, comprises the following steps：
(1) phosphoric acid and urea are added in mixing channel I, control P in acid solution2O5With CO (NH2)2Mol ratio is 1：0.9,
Obtain mixing A after well mixed；
(2) the mixed slurry A obtained in step (1) is pumped into thickener to be concentrated, controls P2O5Mass percentage content
For 41.5%, enriching slurry B is obtained after concentration；
(3) the slurry B obtained in step (2) is passed through tubular reactor, adds sulfuric acid, and be passed through ammonia, control P2O5With
The mol ratio of sulfate radical is 1：1.5, pH=2-3.5,160-170 DEG C of temperature, after reaction completely, obtain slurry C；
(4) the slurry C obtained in step (3) is sprayed into comminutor and carries out slurry-spraying pelletizing, then transport to dryer
Row drying, is then sieved, packaging and storage, defective work are back to granulation to certified products as returning charge after crushing after cooling
Circulation production is carried out in machine.
Product nutrient testing result：P2O531.85%, wherein, polymeric form phosphorus is with P2O5Meter 3.42%；Amidonitrogen
0.64%, ammonium nitrogen 14.91%, total N15.55%, S10.69%.
Embodiment 5
A kind of preparation method of acidic fertilizier, comprises the following steps：
(1) phosphoric acid and urea are added in mixing channel I, control P in acid solution2O5With CO (NH2)2Mol ratio is 1：0.9,
Mixed material is obtained after well mixed, P is then added into mixed material2O5With CO (NH2)2The soil improvement of gross mass 13%
The factor, wherein the described soil improvement factor is alginic acid, humic acid, the mixture of poly-aspartate, wherein alginic acid, rotten plant
Acid, the mass ratio of poly-aspartate are 2：7：5；
(2) the mixed slurry A obtained in step (1) is pumped into thickener to be concentrated, controls P2O5Mass percentage content
For 40%, enriching slurry B is obtained after concentration；
(3) the slurry B obtained in step (2) is passed through tubular reactor, adds sulfuric acid, and be passed through ammonia, control P2O5With
The mol ratio of sulfate radical is 1：1.5, pH2-3.5,160-170 DEG C of temperature, after reaction completely, obtain slurry C；
(4) the slurry C obtained in step (3) is sprayed into comminutor and carries out slurry-spraying pelletizing, then transport to dryer
Row drying, is then sieved, packaging and storage, defective work are back to granulation to certified products as returning charge after crushing after cooling
Circulation production is carried out in machine.
Product nutrient testing result：P2O529.31%, wherein, polymeric form phosphorus is with P2O5Meter 3.13%；Amidonitrogen
1.76%, ammonium nitrogen 14.01%, total N15.77%, S9.87%, the soil improvement factor 5.24%.
Comparative example 1
By APP (N22.8%, P2O557.7%) 46.62 parts, MAP (N 11%, P2O560%) 186.74
Part, 321.3 parts of ammonium sulfate (N21.2%), Diammonium phosphate (DAP) (N18%, P2O546%) 445.34 parts it is broken well mixed, obtain
N17.08%, P2O534.38%, wherein polymeric form phosphorus 2.69%, S7.79% product, then add sulfuric acid regulation pH=3.3
After be granulated it is standby.
Comparative example 2
As described in Example 1, unlike：Ammonia intake in rate-determining steps 4, so that final products pH=2.
Comparative example 3
As described in Example 1, unlike：Ammonia intake in rate-determining steps 4, the final products pH=5 made.
Comparative example 4
As described in Example 5, unlike：Ammonia intake in rate-determining steps 3, pH to 5 is adjusted using ammonia.
Comparative example 5
As described in Example 1, unlike：Added by adding ammonium sulfate instead of sulfuric acid and ammonia, controlling reaction temperature
≤ 100 DEG C, so as to not produce APP.
Test example 1, manure trial
1st, test site：Xianyang, Shanxi province city Wugong County river course village of river course township, soil data are as shown in table 3：
Table 3
| Alkali-hydrolyzable nitrogen (ppm) | Available phosphorus (ppm) | Available potassium (ppm) | Organic matter (%) | pH |
| 108.82 | 11.56 | 110.5 | 1.22 | 8.49 |
2nd, test process
Experiment sets 8 processing experiments altogether, and experiment crop is winter wheat.Experimental plot edge sets two rows protection row, does not calculate
In result of the test.
Handle specific as follows：
Processing 1：According to habits fertilization, every mu of Diammonium phosphate (DAP) (content is N 18%, P2O5 46%) 50kg ammonium sulfate conduct
Base fertilizer.
Processing 2：Obtained product is as base fertilizer in every mu of 50kg embodiment 1.
Processing 3：Obtained product is as base fertilizer in every mu of 50kg comparative example 1.
Processing 4：Obtained product is as base fertilizer in every mu of 50kg comparative example 2.
Processing 5：Obtained product is as base fertilizer in every mu of 50kg comparative example 3.
Processing 6：Obtained product is as base fertilizer in every mu of 50kg embodiment 5.
Processing 7：Obtained product is as base fertilizer in every mu of 50kg comparative example 4.
Processing 8：Obtained product is as base fertilizer in every mu of 50kg comparative example 5.
3rd, result of the test is as shown in table 4：
Table 4
| Processing | Yield (kg/ mus) | Than the volume increase of processing 1 |
| Handle 1 (control) | 566kg | ---- |
| Handle 2 (embodiments 1) | 613kg | 8.30% |
| Handle 3 (no acid amides, no urea phosphates) | 597kg | 5.48% |
| Handle 4 (pH=2) | 619kg | 9.36% |
| Handle 5 (pH=5) | 569kg | 0.53% |
| Handle 6 (embodiments 5) | 629kg | 11.13% |
| Handle 7 (pH=5) | 575kg | 1.59% |
| Processing 8 | 596kg | 5.30% |
It can be obtained by comparison of test results in table 4 to draw a conclusion：
1st, processing 2,6 illustrates acidic fertilizier ratio prepared by the inventive method respectively than the volume increase of processing 1 8.3%, 11.13%
Traditional Diammonium phosphate (DAP) has obvious effect of increasing production.
2nd, processing 2 increases production 2.82% than processing more than 3, and the long-acting of nitrogen can be ensured by illustrating the presence of urea phosphate in the present invention,
So that as the nitrogenous fertilizer for having abundance.
3rd, processing 2 increases production 7.77% than processing more than 5, and processing 6 increases production 9.72% than processing more than 7, illustrates the acidity of the present invention
PH value can be around effective activation soil phosphorus and middle trace element, so as to which effect of increasing production is obvious.
4th, processing 2 increases production 3.00% than processing more than 8, illustrates that the APP in the present invention serves certain rush volume increase effect
Fruit.
5th, the volume increase difference of processing 2 and processing 4 is little, but is found by product analysis, passes through acidity prepared by processing 4
Product is difficult to dry, and can not form preferable commercial prod.
To sum up conclusion (of pressure testing), pass through the agronomic trials of winter wheat, it can be deduced that product of the present invention compared with nitrogen phosphorus nutrient content compared with
High Diammonium phosphate (DAP) obvious effect of increasing production, the excellent results of fat-reducing synergy are served, and active ingredient lacks in product of the present invention
One can not, play synergistic function between each composition, only using the production technology and technological parameter of the present invention, can just produce
The special efficacy product of the present invention.Therefore, product of the present invention can be widely applied on salt affected soil.
Claims (10)
1. a kind of preparation method of acidic fertilizier, including：
By raw material phosphoric acid, the blend step of urea；
Mixed reactions steps；
It is granulated, baking step.
2. preparation method according to claim 1, it is characterised in that in raw material blend step, phosphoric acid is with P2O5Meter, urea
In terms of urea molecule, wherein, phosphoric acid：The mol ratio of urea is 1：(0.3-1.4), preferably 1：(0.8-1.2).
3. preparation method according to claim 1, it is characterised in that in raw material blend step, the mixing of phosphoric acid and urea
P is controlled in slurry2O5Weight/mass percentage composition is 34%-42%；It is preferred that 36%-40%.
4. preparation method according to claim 1, it is characterised in that in blend step, selectively add and account for fertilizer product
Mass fraction 0.01-2% trace elements, wherein in the micro- raw material, copper preferably sulfuric acid copper and/or EDTA chelas
Close copper, boron element preferred boric acid, Zn-ef ficiency preferably sulfuric acid zinc and/or EDTA chelated zincs, ferro element preferably sulfuric acid it is ferrous and/or
EDTA is chelating ferrous, manganese element preferably sulfuric acid manganese and/or the preferred ammonium molybdate of EDTA Chelated Manganeses, molybdenum element；
Preferably, in blend step, selectively add and account for the fertilizer product mass fraction 5-10% soil improvement factors, wherein described
The soil improvement factor be humic acid and/or alginic acid and/or poly-aspartate, planted as the preferable soil improvement factor to be rotten
Acid, alginic acid, the mixture of poly-aspartate, the mass ratio of the wherein addition of alginic acid, humic acid and poly-aspartate are preferred
For 1~4：5~10：2~6, further preferred 2~3：6~9：4~5.
5. preparation method according to claim 1, it is characterised in that in reactions steps, sulfuric acid is each led into system
And ammonia, nitrogen sulfur content and pH in regulation system；
Preferably, described ammonia is ammonia or anhydrous liquid ammonia.
6. preparation method according to claim 1, it is characterised in that in reactions steps, reaction temperature is 130-220 DEG C.
7. preparation method according to claim 5, it is characterised in that in reactions steps, the addition control of sulfuric acid exists：Body
P in phosphoric acid in system2O5：The mol ratio of sulfate radical is 1 in sulfuric acid：1-2, preferably 1：1.2-1.6.
Preferably, by controlling the intake of ammonia, control product pH value is in 2.5-3.5.
8. preparation method according to claim 1, it is characterised in that reactions steps are completed, and obtain acidic fertilizier feed liquid；It is acid
Feed liquid is through being granulated, baking step, obtains acidic fertilizier.
9. preparation method according to claim 1, it is characterised in that after the completion of reaction, added in granulation process micro
Element；
Preferably, after the completion of reaction, poly-aspartate, humic acid or/and alginic acid are added in granulation process.
10. preparation method according to claim 1, it is characterised in that described phosphoric acid is phosphoric acid by wet process；Preferably, institute
Phosphoric acid is stated with P2O5The mass percent concentration of meter is 30%-47%.
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| CN201710938939.6A Pending CN107721730A (en) | 2017-10-11 | 2017-10-11 | A kind of preparation method of acidic fertilizier |
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| CN (1) | CN107721730A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108484295A (en) * | 2018-06-13 | 2018-09-04 | 贵阳开磷化肥有限公司 | A kind of preparation method of high-nitrogen compound fertilizer |
| CN110452023A (en) * | 2019-08-08 | 2019-11-15 | 宜都兴发化工有限公司 | A kind of additive of complex fertilizer |
| CN115490565A (en) * | 2022-06-30 | 2022-12-20 | 金正大生态工程集团股份有限公司 | Slow fertilizer and preparation method thereof |
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| CN102503719A (en) * | 2011-10-13 | 2012-06-20 | 贵州川恒化工有限责任公司 | Preparation method of strong-acidic water-soluble fertilizer special for alkaline soil |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108484295A (en) * | 2018-06-13 | 2018-09-04 | 贵阳开磷化肥有限公司 | A kind of preparation method of high-nitrogen compound fertilizer |
| CN110452023A (en) * | 2019-08-08 | 2019-11-15 | 宜都兴发化工有限公司 | A kind of additive of complex fertilizer |
| CN115490565A (en) * | 2022-06-30 | 2022-12-20 | 金正大生态工程集团股份有限公司 | Slow fertilizer and preparation method thereof |
| CN115490565B (en) * | 2022-06-30 | 2023-09-08 | 金正大生态工程集团股份有限公司 | Slow fertilizer and preparation method thereof |
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Application publication date: 20180223 |