CN104261937B - A kind of production method preparing primary ammonium phosphate by-product Chinese yam special fertilizer - Google Patents
A kind of production method preparing primary ammonium phosphate by-product Chinese yam special fertilizer Download PDFInfo
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- CN104261937B CN104261937B CN201410477769.2A CN201410477769A CN104261937B CN 104261937 B CN104261937 B CN 104261937B CN 201410477769 A CN201410477769 A CN 201410477769A CN 104261937 B CN104261937 B CN 104261937B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/28—Ammonium phosphates
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
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Abstract
The present invention relates to chemical technology field, especially a kind of production method preparing primary ammonium phosphate by-product Chinese yam special fertilizer, by analyzing the demand of Chinese yam process of growth Middle nutrition element, and undertaken analyzing and understand by fertile situation to traditional yam planting, and to the absorbing state of n-p-k element, research and discussion is carried out to crop, analyze in conjunction with the shortcoming in primary ammonium phosphate product preparation process, and then the preparation technology of the production technique of Chinese yam special fertilizer and primary ammonium phosphate product is combined, the preparation technology of primary ammonium phosphate product and the preparation technology of Chinese yam special fertilizer is made to carry out complementation, the waste liquid produced in primary ammonium phosphate product preparation process is adopted to carry out the production of Chinese yam special fertilizer, improve the added value of product in primary ammonium phosphate product preparation process, reduce discharging of waste liquid amount, also make the waste also can avoiding nitrogen phosphor resource of unnecessary degree of depth crystalline ammonium dihydrogen product in primary ammonium phosphate technique simultaneously.
Description
Technical field
The present invention relates to chemical technology field, especially a kind of production method preparing primary ammonium phosphate by-product Chinese yam special fertilizer.
Background technology
In the cultivation management of Chinese yam, the rational application of fertilizer is the important factor of a n-th-trem relation n to Chinese yam yield and quality., stronger for the randomness that yam planting is fertile at present, blindness is larger, N P and K Application Ratio numerous imbalances, cause the salt accumulation of soil more, the output of Chinese yam reduces, inferior quality, not only cause the waste of fertilizer, also easy contaminate environment, the angle for this reason having investigator to apply fertilizer from slowly-releasing is studied yam planting fertilizer, " a kind of with the biological particles charcoal Chinese yam that is matrix slow-release fertilizer dedicated and preparation method thereof " of being CN201210200904.X as the patent No. adopts biological particles carbon, it is fertile that one or several in binding agent and azophoska carry out being mixed with slowly-releasing Chinese yam, improve the appropriateness that Chinese yam is fertile, the angle having again investigator to bring into from fertilising reduction germ is studied, if the patent No. is CN201310228972.1, " a kind of polynary microorganism special fertilizer preventing and treating numb Chinese yam anthrax and preparation method thereof " adopts traditional chemical fertilizer such as borax, ferrous sulfate, manganous sulfate, urea, ammonium phosphate, zinc sulfate, calcium superphosphate or composite fertilizer and straw powder, and biological bacteria etc. are made according to certain proportioning, as can be seen here, all adopt traditional chemical fertilizer or composite fertilizer to carry out cooperation to form about Chinese yam with fertilizer in prior art, such fertilizer can meet the nutritional needs of yam planting, the quantity and quality of Chinese yam can be improved, but be difficult to the suitable proportion reaching n-p-k element between its formula, make Chinese yam simultaneously stability n-p-k element, and reduce n-p-k element residual in soil, and then overcome yam planting because wooden barrel short slab is theoretical and cause nutritional deficiency disease, we are badly in need of to provide a kind of new approaches by the special fertilizer fertile to yam planting for this reason.
Simultaneously, the preparation technology of primary ammonium phosphate product normally adopts phosphoric acid by wet process and thermal phosphoric acid to carry out producing, but be no matter that thermal phosphoric acid or Wet Processes of Phosphoric Acid are to prepare primary ammonium phosphate product, impact all can to the purity of primary ammonium phosphate product, make the purity of primary ammonium phosphate product poor, be difficult to meet industrial requirement, for this reason, in the process preparing primary ammonium phosphate product, the larger one-tenth of cost is needed originally to carry out the purification of primary ammonium phosphate product; For this reason, investigator is had to adopt intermediate substitute mode, with phosphoric acid and urea reaction to this, prepare Ureaphil intermediate, but this reaction completes below 80 DEG C, and then again by decrease temperature crystalline process, separate out primary ammonium phosphate product, and then raising primary ammonium phosphate product purity; ; often the needing of this processing step carries out degree of depth crystallization to primary ammonium phosphate; and then reduce the waste in the solution of nitrogen phosphoric to greatest extent, thus cost prepared by reduction primary ammonium phosphate product, relatively large discharging of waste liquid also can be avoided to cause certain pollution to environment; And in degree of depth crystallisation process, often along with the generation of other products, with primary ammonium phosphate crystallized mixed, and then can again have impact on the purity of primary ammonium phosphate product again.
For this reason, this investigator passes through in yam planting process, Chinese yam nutrient demand situation, and in conjunction with the defect existed in primary ammonium phosphate product preparation process, the preparation technology of Chinese yam special fertilizer preparation technology and primary ammonium phosphate product is combined, for the preparation technology of primary ammonium phosphate and Chinese yam special fertilizer provides a kind of new approaches.
Summary of the invention
In order to solve the above-mentioned technical problem existed in prior art, the invention provides a kind of production method preparing primary ammonium phosphate by-product Chinese yam special fertilizer, have and the preparation technology of Chinese yam special fertilizer preparation technology and primary ammonium phosphate product is combined, the waste liquid in primary ammonium phosphate product preparation process is adopted to carry out the preparation of Chinese yam special fertilizer, improve the added value in primary ammonium phosphate product preparation process, avoid simultaneously and degree of depth crystallization is carried out to reduce production cost to primary ammonium phosphate, further improve purity and the quality of primary ammonium phosphate product, also can prepare simultaneously and meet Chinese yam growth demand, and can guarantee to remain in the feature of the less N P and K double salt composite fertilizer of n-p-k element content in soil.
Be achieved particular by following technical scheme:
A kind of production method preparing primary ammonium phosphate by-product Chinese yam special fertilizer, phosphoric acid is adopted to be (1.4-1.8) with urea according to mol ratio: 1 mixes, and to adjust temperature be 101-131 DEG C, stirring reaction 0.7-1.6h, obtain intermediate slip, and ammonia is passed in intermediate slip, control temperature of reaction is 70-80 DEG C, stirring reaction 35min, reaction end pH value is 4.3-4.5, obtain phosphoric acid ammonium dihydrogen slip, and the product of phosphoric acid ammonium dihydrogen slip is placed in circulation temperature lowering crystallizer, carry out circulation temperature lowering crystallization treatment, and detect the nitrogen phosphorus element content analyzed in filtrate, adjustment nitrogen phosphorus element content reaches (1.3-1.4): when 1, stop the crystallization of primary ammonium phosphate product and filter, filter cake is primary ammonium phosphate product, in filtrate, add potassium composition and medium trace element compound be adjusted to chemical combination state composite fertilizer just finished product, the potassium component content wherein added and the content of nitrogen phosphoric compare for n-p-k element forms mol ratio for (1.4-1.6): (1.1-1.5): (1.4-1.5), and first finished product is placed in baker, adopt heat-up rate to be that 3 DEG C/min is warming up to 45-55 DEG C, after dry 0.5-2h, adjustment moisture content is 1-2.5%, can obtain Chinese yam special chemical combination state composite fertilizer.
Specifically comprise the following steps:
(1) raw material preparation mixing: be (1.4-1.8) according to mol ratio by phosphoric acid and urea: 1 in stirring-type reactor, be 101-131 DEG C in temperature, the stirring velocity controlling stirring tank is that 180-200r/min is uniformly mixed reaction 0.7-1.6h, obtains intermediate slip;
(2) primary ammonium phosphate is prepared: to step 1) pass into ammonia in the intermediate slip that obtains, and the temperature controlled in reactor is 70-80 DEG C, be 65-75r/min according to stirring velocity, stirring reaction 35min, reaction end pH value is 4.3-4.5, obtains the slip of phosphoric acid ammonium dihydrogen product;
(3) circulation crystallization filters: by step 2) slip that obtains phosphoric acid ammonium dihydrogen is placed in cooling crystallizer 10s and is cooled to temperature≤38 DEG C, down cycles crystallization filtration treatment, and detect the nutrient content analyzed in filtrate, treat nitrogen component, the mol ratio of phosphorus composition is (1.3-1.4): when 1, stop crystallization and filter, acquisition filter cake is primary ammonium phosphate, potassium composition is added and medium trace element compound adjustment fertilizer structure becomes chemical combination state composite fertilizer just finished product in filtrate, the ratio that the potassium component content wherein added is n-p-k element with the content ratio of nitrogen phosphoric is (1.4-1.6): (1.1-1.5): (1.4-1.5),
(4) filtrate dries: by step 3) the chemical combination state composite fertilizer that obtains just finished product be placed in baker, heat-up rate is adopted to be that 3 DEG C/min is warming up to 45-55 DEG C, after dry 0.5-1h, adjustment moisture content is 1-2.5%, can obtain Chinese yam special chemical combination state composite fertilizer.
Described potassium composition is the one in potassium oxalate, Potassium ethanoate, Repone K.
Described medium trace element compound is the mixture of calcium sulfate, magnesium sulfate, zinc sulfate, ferric sulfate, manganous sulfate, borax, humic acid, plant ash.
The concentration of potassium composition is 30%.
The total addition level of medium trace element compound is about 11% of waste liquid gross weight.
Described chemical combination state composite fertilizer, containing following N P and K chemical combination state structural formula in its composition:
wherein, the dotted line between carbon atom and Sauerstoffatom represents to there is coordinate bond between C atom and O atom.
When adding, can also add corn stalk powder, sugarcane straw powder, rice straw powder, herba houttuyniae powder, tangerine peel powder, taraxacum powder, poultry animal excretion, natural pond slag, Baijunling, EDTA, agroform, amino acid and amino acid are received.
Compared with prior art, the technique effect of technical scheme of the present invention is embodied in:
3, by analyzing the demand of Chinese yam process of growth Middle nutrition element, and undertaken analyzing and understand by fertile situation to traditional yam planting, and to the absorbing state of n-p-k element, research and discussion is carried out to crop, analyze in conjunction with the shortcoming in primary ammonium phosphate product preparation process, and then the preparation technology of the production technique of Chinese yam special fertilizer and primary ammonium phosphate product is combined, the preparation technology of primary ammonium phosphate product and the preparation technology of Chinese yam special fertilizer is made to carry out complementation, the waste liquid produced in primary ammonium phosphate product preparation process is adopted to carry out the production of Chinese yam special fertilizer, improve the added value of product in primary ammonium phosphate product preparation process, reduce discharging of waste liquid amount, also make the waste also can avoiding nitrogen phosphor resource of unnecessary degree of depth crystalline ammonium dihydrogen product in primary ammonium phosphate technique simultaneously.
4, by the control of the processing parameter in phosphoric acid and urea reaction process, make the structural formula of Ureaphil that complicated change occur, and then form the complexity polymerization phosphorus urea gas ions of Nitrogen-and Phosphorus-containing, this gas ions can compared with the content of the n-p-k element in the control chemical combination state double salt structure of limits, and then the obtained azophoska salt chemical combination state composite fertilizer meeting Chinese yam process of growth needs, and the seed output and quality of Chinese yam is improved largely, reduce the planting cost of peasant household, avoid the environmental pollution that Fertilization Effect is brought, there is the significant value of environmental protection and economic benefit, , the purity of primary ammonium phosphate product is substantially increased meanwhile, the quality of primary ammonium phosphate product is guaranteed.
5, by technical parameter in chemical combination state compound fertilizer production technology, namely be exactly temperature, the control of material concentration and proportioning, after making phosphoric acid and urea reaction, generate Ureaphil product, Ureaphil product itself has stronger acidity, and between phosphoric acid and urea, be the chemical combination state double salt be combined together to form by the mode of coordinate bond, also be fertile as crop in conventional art, and crop is to the specific absorption comparison urea of this chemical combination state double salt, volatile salt, the unitary such as ammonium nitrate, binary fertilizer specific absorption is a kind of chemical combination state composite fertilizer all preferably, but, under the environment that this chemical combination state double salt exists at phosphoric acid, at the temperature of 80-250 DEG C, complicated decomposition polyreaction can be there is, Ureaphil is made to form (H
2pO
4)
-(H
2nCONH
3)
+two ions, (H
2nCONH
3)
+ion and phosphoric acid close, and be under the environment of 80-160 DEG C in temperature, formed
intermediate-ion and dihydrogen phosphate, and coordinate bond is formed between C and O, this intermediate-ion can form multielement intermediate-ion with centering element compound chelating, and then the compound electronegative with other can be continued or ion forms inner complex, improve constituent content in double salt, and then the nutrient content that can adjust in the double salt of this ion existence, simultaneously, this inner complex can be hydrolyzed again and absorbed by crops, and then fertilizer efficiency can be provided for crop effectively for a long time, simultaneously, in conjunction with the mensuration of constituent content in the solution existed this ion, and then each constituent content during formation of adjustment double salt, dry the composite fertilizer obtained containing chemical combination state double salt structure, improve the quality of Chinese yam special fertilizer.
Embodiment
Below in conjunction with concrete embodiment, further restriction is done to technical scheme of the present invention, but claimed scope is not only confined to done description.
Principle illustrates:
The present invention carries out research and discussion by the mechanism of reacting phosphoric acid and carboxamide, and arrives in conjunction with prior art literature, and phosphoric acid and carboxamide react and generate Ureaphil, and its molecular formula is: CO (NH
2)
2.H
3pO
4under the environment of comparatively high temps, the chemical bond meeting dialysis between H and O in phosphoric acid, hydrogen ion is combined the ionic state formed containing positive charge with urea, the ion double salt making Ureaphil form a kind of positive and negative charge to attract mutually, its mechanism structural response following expression: CO (NH
2)
2.H
3pO
4→ (H
2pO
4)
-. (H
2nCONH
3)
+
Further, under the environment that Ureaphil ion double salt exists at phosphoric acid, (H wherein
2nCONH
3)
+positive ion and phosphoric acid close, form the intermediate-ion of C → O coordinate bond, be (CO
5pN
2h
8)
+, and then make in Ureaphil intermediate containing a large amount of (H
2pO
4)
-(CO
5pN
2h
8)
+ion, when adding excessive and appropriate ammonium radical ion, dihydrogen phosphate and ammonium radical ion form ammonium dihydrogen phosphate crystal and are precipitated, and by detecting the content of the nitrogen phosphoric analyzed in filtrate, and add potassium element, magnesium elements, ferro element and other medium trace element according to the demand of Chinese yam, trophic structure in adjustment filtrate, makes trophic structure layer meet the demand of Chinese yam, then dries the Chinese yam special chemical combination state composite fertilizer that can obtain containing N, P, K and other elements.
Its concrete reaction principle will carry out further instruction by following reaction structure formula and reaction mechanism:
Reaction formula one:
CO(NH
2)
2+H
3PO
4→CO(NH
2)
2.H
3PO
4
Reaction formula two:
Reaction formula three:
Wherein, the dotted line between carbon atom and Sauerstoffatom represents to there is coordinate bond between C atom and O atom.
Reaction formula four:
Primary ammonium phosphate product to be crystallized out after, then in filtrate, add potassium element and other elements, then can with the dihydrogen phosphate remained in filtrate, hydrogen phosphate and
intermediate-ion react, generate the chemical combination state Chinese yam composite fertilizer special of Multiple salts forms.
Noun illustrates:
Ureaphil (Ureaphosphate, UP), No. CAS is 4861-19-2, and molecular formula is CH
7n
2o
5p, can be expressed as CO (NH
2)
2h
3pO
4:
It is a kind of fine chemical product being widely used in the fields such as livestock industry, industry, agricultural, its solid is white crystals or crystalline powder, and soluble in water and alcohol is insoluble to ethers, toluene and tetracol phenixin, the aqueous solution, in acid, start during melting to decompose and releases carbonic acid gas and ammonia.
Embodiment: with concrete operation embodiment, the present invention is further elaborated below.
Embodiment 1
Prepare a production method for primary ammonium phosphate by-product Chinese yam special fertilizer, comprise the following steps:
(1) raw material preparation mixing: by phosphoric acid and urea according to mol ratio be 1.4:1 in stirring-type reactor, be 101 DEG C in temperature, the stirring velocity controlling stirring tank is that 180r/min is uniformly mixed and reacts 0.7h, obtains intermediate slip;
(2) primary ammonium phosphate is prepared: to step 1) pass into ammonia in the intermediate slip that obtains, and the temperature controlled in reactor is 70 DEG C, is 65r/min according to stirring velocity, stirring reaction 35min, reaction end pH value is 4.3, obtains the slip of phosphoric acid ammonium dihydrogen product;
(3) circulation crystallization filters: by step 2) slip that obtains phosphoric acid ammonium dihydrogen is placed in cooling crystallizer 10s and is cooled to temperature 38 DEG C, down cycles crystallization filtration treatment, and detect the nutrient content analyzed in filtrate, treat nitrogen component, when the mol ratio of phosphorus composition is 1.3:1, stop crystallization and filter, acquisition filter cake is primary ammonium phosphate, potassium composition is added and medium trace element compound adjustment fertilizer structure becomes chemical combination state composite fertilizer just finished product in filtrate, the ratio that the potassium component content wherein added is n-p-k element with the content ratio of nitrogen phosphoric is 1.4:1.1:1.4,
(4) filtrate dries: by step 3) the chemical combination state composite fertilizer that obtains just finished product be placed in baker, adopt heat-up rate to be that 3 DEG C/min is warming up to 45 DEG C, after dry 0.5h, adjustment moisture content is 1%, can obtain Chinese yam special chemical combination state composite fertilizer.
Described potassium composition is potassium oxalate.
Described medium trace element compound is the mixture of 0.5% calcium sulfate, 0.3% magnesium sulfate, 0.1% zinc sulfate, 0.08% ferric sulfate, 0.07% manganous sulfate, 0.09% borax, 2.1% humic acid, 3.5% plant ash.
The concentration of potassium composition is 30%.
Embodiment 2
Prepare a production method for primary ammonium phosphate by-product Chinese yam special fertilizer, comprise the following steps:
(1) raw material preparation mixing: by phosphoric acid and urea according to mol ratio be 1.8:1 in stirring-type reactor, be 131 DEG C in temperature, the stirring velocity controlling stirring tank is that 200r/min is uniformly mixed and reacts 1.6h, obtains intermediate slip;
(2) primary ammonium phosphate is prepared: to step 1) pass into ammonia in the intermediate slip that obtains, and the temperature controlled in reactor is 80 DEG C, is 75r/min according to stirring velocity, stirring reaction 35min, reaction end pH value is 4.5, obtains the slip of phosphoric acid ammonium dihydrogen product;
(3) circulation crystallization filters: by step 2) slip that obtains phosphoric acid ammonium dihydrogen is placed in cooling crystallizer 10s and is cooled to temperature 35 DEG C, down cycles crystallization filtration treatment, and detect the nutrient content analyzed in filtrate, treat nitrogen component, when the mol ratio of phosphorus composition is 1.4:1, stop crystallization and filter, acquisition filter cake is primary ammonium phosphate, potassium composition is added and medium trace element compound adjustment fertilizer structure becomes chemical combination state composite fertilizer just finished product in filtrate, the ratio that the potassium component content wherein added is n-p-k element with the content ratio of nitrogen phosphoric is 1.6:1.5:1.4,
(4) filtrate dries: by step 3) the chemical combination state composite fertilizer that obtains just finished product be placed in baker, adopt heat-up rate to be that 3 DEG C/min is warming up to 55 DEG C, after dry 1h, adjustment moisture content is 2.5%, can obtain Chinese yam special chemical combination state composite fertilizer.
Described potassium composition is Potassium ethanoate.
Described medium trace element compound is the mixture of 0.7% calcium sulfate, 0.2% magnesium sulfate, 0.09% zinc sulfate, 0.07% ferric sulfate, 0.08% manganous sulfate, 0.08% borax, 1.9% humic acid, 4.7% plant ash.
The concentration of potassium composition is 30%.
Embodiment 3
Prepare a production method for primary ammonium phosphate by-product Chinese yam special fertilizer, comprise the following steps:
(1) raw material preparation mixing: by phosphoric acid and urea according to mol ratio be 1.6:1 in stirring-type reactor, be 120 DEG C in temperature, the stirring velocity controlling stirring tank is that 190r/min is uniformly mixed and reacts 1.2h, obtains intermediate slip;
(2) primary ammonium phosphate is prepared: to step 1) pass into ammonia in the intermediate slip that obtains, and the temperature controlled in reactor is 75 DEG C, is 70r/min according to stirring velocity, stirring reaction 35min, reaction end pH value is 4, obtains the slip of phosphoric acid ammonium dihydrogen product;
(3) circulation crystallization filters: by step 2) slip that obtains phosphoric acid ammonium dihydrogen is placed in cooling crystallizer 10s and is cooled to temperature 30 DEG C, down cycles crystallization filtration treatment, and detect the nutrient content analyzed in filtrate, treat nitrogen component, when the mol ratio of phosphorus composition is 1.35:1, stop crystallization and filter, acquisition filter cake is primary ammonium phosphate, potassium composition is added and medium trace element compound adjustment fertilizer structure becomes chemical combination state composite fertilizer just finished product in filtrate, the ratio that the potassium component content wherein added is n-p-k element with the content ratio of nitrogen phosphoric is 1.5:1.4:1.45,
(4) filtrate dries: by step 3) the chemical combination state composite fertilizer that obtains just finished product be placed in baker, heat-up rate is adopted to be that 3 DEG C/min is warming up to 50 DEG C, after dry 0.8h, adjustment moisture content is 1.8%, can obtain Chinese yam special chemical combination state composite fertilizer.
Described potassium composition is Repone K.
Described medium trace element compound is the mixture of 0.7% calcium sulfate, 0.1% magnesium sulfate, 0.09% zinc sulfate, 0.09% ferric sulfate, 0.08% manganous sulfate, 0.07% borax, 1.7% humic acid, 4.1% plant ash.
The concentration of potassium composition is 30%.
Test example: the technique effect of technical scheme of the present invention and product performance are described further below in conjunction with specific embodiment content.
The planting technology of traditionally planting Chinese yam unifies plantation and unified management to Chinese yam, and is divided into experimental group and control group, and experimental group and control group carry out fertilizer treatment with 50kg/ mu; Experimental group executes the Chinese yam composite fertilizer special that obtains of preparation method of embodiments of the invention 1, embodiment 2, embodiment 3; Control group is executed and is carried out traditionally preparing, and wherein nitrogen phosphoris and potassium fertilizer ratio is the Chinese yam special fertilizer of 1.5:1.4:1.45,1.6:1.5:1.4,1.4:1.1:1.4, and label is A, B, C respectively.
In vegetative period, field investigation is carried out to the Chinese yam applying above-mentioned control group and experimental group fertilizer, the upgrowth situation of record Chinese yam, and gathered in the crops after 1 year, measure the output of Chinese yam, shown in it the results are shown in Table.
Table
As can be seen from data presentation in table, Chinese yam special fertilizer of the present invention can improve the quality of Chinese yam, and improve the active constituent content of Chinese yam, and can improve the growth situation of Chinese yam for a long time, make the growth cycle of Chinese yam shorter, the stem stalk diameter of Chinese yam is more excellent.
Claims (5)
1. prepare the production method of primary ammonium phosphate by-product Chinese yam special fertilizer for one kind, it is characterized in that, phosphoric acid is adopted to be (1.4-1.8) with urea according to mol ratio: 1 mixes, and to adjust temperature be 101-131 DEG C, stirring reaction 0.7-1.6h, obtain intermediate slip, and ammonia is passed in intermediate slip, control temperature of reaction is 70-80 DEG C, stirring reaction 35min, reaction end pH value is 4.3-4.5, obtain phosphoric acid ammonium dihydrogen slip, and the product of phosphoric acid ammonium dihydrogen slip is placed in circulation temperature lowering crystallizer, carry out circulation temperature lowering crystallization treatment, and detect the nitrogen phosphorus element content analyzed in filtrate, adjustment nitrogen phosphorus element content reaches (1.3-1.4): when 1, stop the crystallization of primary ammonium phosphate product and filter, filter cake is primary ammonium phosphate product, in filtrate, add potassium composition and medium trace element compound be adjusted to chemical combination state composite fertilizer just finished product, the potassium component content wherein added and the content of nitrogen phosphoric compare for n-p-k element forms mol ratio for (1.4-1.6): (1.1-1.5): (1.4-1.5), and first finished product is placed in baker, adopt heat-up rate to be that 3 DEG C/min is warming up to 45-55 DEG C, after dry 0.5-2h, adjustment moisture content is 1-2.5%, can obtain Chinese yam special chemical combination state composite fertilizer.
2. prepare the production method of primary ammonium phosphate by-product Chinese yam special fertilizer as claimed in claim 1, it is characterized in that, comprise the following steps:
(1) raw material preparation mixing: be (1.4-1.8) according to mol ratio by phosphoric acid and urea: 1 in stirring-type reactor, be 101-131 DEG C in temperature, the stirring velocity controlling stirring tank is that 180-200r/min is uniformly mixed reaction 0.7-1.6h, obtains intermediate slip;
(2) primary ammonium phosphate is prepared: to step 1) pass into ammonia in the intermediate slip that obtains, and the temperature controlled in reactor is 70-80 DEG C, be 65-75r/min according to stirring velocity, stirring reaction 35min, reaction end pH value is 4.3-4.5, obtains the slip of phosphoric acid ammonium dihydrogen product;
(3) circulation crystallization filters: by step 2) slip that obtains phosphoric acid ammonium dihydrogen is placed in cooling crystallizer 10s and is cooled to temperature≤38 DEG C, down cycles crystallization filtration treatment, and detect the nutrient content analyzed in filtrate, treat nitrogen component, the mol ratio of phosphorus composition is (1.3-1.4): when 1, stop crystallization and filter, acquisition filter cake is primary ammonium phosphate, potassium composition is added and medium trace element compound adjustment fertilizer structure becomes chemical combination state composite fertilizer just finished product in filtrate, the ratio that the potassium component content wherein added is n-p-k element with the content ratio of nitrogen phosphoric is (1.4-1.6): (1.1-1.5): (1.4-1.5),
(4) filtrate dries: by step 3) the chemical combination state composite fertilizer that obtains just finished product be placed in baker, heat-up rate is adopted to be that 3 DEG C/min is warming up to 45-55 DEG C, after dry 0.5-1h, adjustment moisture content is 1-2.5%, can obtain Chinese yam special chemical combination state composite fertilizer.
3. prepare the production method of primary ammonium phosphate by-product Chinese yam special fertilizer as claimed in claim 1 or 2, it is characterized in that, described potassium composition is the one in potassium oxalate, Potassium ethanoate, Repone K.
4. prepare the production method of primary ammonium phosphate by-product Chinese yam special fertilizer as claimed in claim 1 or 2, it is characterized in that, described medium trace element compound is the mixture of calcium sulfate, magnesium sulfate, zinc sulfate, ferric sulfate, manganous sulfate, borax, humic acid, plant ash.
5. prepare the production method of primary ammonium phosphate by-product Chinese yam special fertilizer as claimed in claim 1 or 2, it is characterized in that, described chemical combination state composite fertilizer, containing following N P and K chemical combination state structural formula in its composition:
in, the dotted line between carbon atom and Sauerstoffatom represents to there is coordinate bond between C atom and O atom.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101857213A (en) * | 2010-06-04 | 2010-10-13 | 广西明利集团有限公司 | Method for preparing food-grade diammonium phosphate from wet-process phosphoric acid |
| CN102424622A (en) * | 2011-12-05 | 2012-04-25 | 刘书芳 | Formula of bulk blended fertilizer special for yams |
| CN103030129A (en) * | 2012-12-28 | 2013-04-10 | 贵州金正大生态工程有限公司 | Method for producing water-soluble ammonium potassium phosphate fertilizer with wet-method phosphoric acid |
| CN104016322A (en) * | 2014-05-20 | 2014-09-03 | 贵阳中化开磷化肥有限公司 | Production method for diammonium hydrogen phosphate |
-
2014
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101857213A (en) * | 2010-06-04 | 2010-10-13 | 广西明利集团有限公司 | Method for preparing food-grade diammonium phosphate from wet-process phosphoric acid |
| CN102424622A (en) * | 2011-12-05 | 2012-04-25 | 刘书芳 | Formula of bulk blended fertilizer special for yams |
| CN103030129A (en) * | 2012-12-28 | 2013-04-10 | 贵州金正大生态工程有限公司 | Method for producing water-soluble ammonium potassium phosphate fertilizer with wet-method phosphoric acid |
| CN104016322A (en) * | 2014-05-20 | 2014-09-03 | 贵阳中化开磷化肥有限公司 | Production method for diammonium hydrogen phosphate |
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| CN104261937A (en) | 2015-01-07 |
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