CN109081740A - A kind of nitrogen-phosphorus-potassium compound fertilizer and preparation method thereof containing alginic acid - Google Patents

A kind of nitrogen-phosphorus-potassium compound fertilizer and preparation method thereof containing alginic acid Download PDF

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Publication number
CN109081740A
CN109081740A CN201811223004.0A CN201811223004A CN109081740A CN 109081740 A CN109081740 A CN 109081740A CN 201811223004 A CN201811223004 A CN 201811223004A CN 109081740 A CN109081740 A CN 109081740A
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China
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seaweed
phosphorus
fertilizer
alginic acid
nitrogen
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李进
段婷婷
梁燕秋
郑超
蔺中
钟来元
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Guangdong Ocean University
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Guangdong Ocean University
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    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05B—PHOSPHATIC FERTILISERS
    • C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • 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
    • 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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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Pest Control & Pesticides (AREA)
  • Soil Sciences (AREA)
  • Cultivation Of Seaweed (AREA)
  • Fertilizers (AREA)

Abstract

The invention discloses a kind of nitrogen-phosphorus-potassium compound fertilizer and preparation method thereof containing alginic acid, the preparation method of the nitrogen-phosphorus-potassium compound fertilizer containing alginic acid include the following steps: to carry out digestion reaction after S1. pre-processes seaweed, and seaweed digestion filtrate is obtained after filtering；The temperature of the digestion reaction is 50 ~ 60 DEG C, and the time is 2 ~ 5 h；S2. seaweed is digested into filtrate, nitrogenous fertilizer, phosphate fertilizer, potash fertilizer and pH adjusting agent compound, obtains mixed liquor；S3. mixed liquor is post-processed, obtains the nitrogen-phosphorus-potassium compound fertilizer containing alginic acid.The present invention is to realize to discard the high-valued of marine algae resource, using discarded seaweed as primary raw material, provides a kind of preparation method of nitrogen-phosphorus-potassium compound fertilizer containing alginic acid.The preparation method be first by seaweed in 50 DEG C ~ 60 DEG C 2 ~ 5 h of digestion, then with nitrogen, phosphorus and potassium fertilizer compound.The content of alginic acid is higher in the prepared nitrogen-phosphorus-potassium compound fertilizer containing alginic acid, has the advantages that nutrition equilibrium, disease-resistant yield-increasing, fertilizer conservation synergy, green non-pollution, meets the high-quality environment-friendly fertilizer of agricultural sustainable development requirement.

Description

A kind of nitrogen-phosphorus-potassium compound fertilizer and preparation method thereof containing alginic acid
Technical field
The present invention relates to technical field of fertilizer production, more particularly, to a kind of nitrogen-phosphorus-potassium compound fertilizer containing alginic acid and Preparation method.
Background technique
Seaweed is that the low photosynthetic plant grown in ocean also contains containing nutrient possessed by land plant The microelements such as potassium, magnesium, iodine, zinc, titanium, manganese and alginic acid, seaweed mannitol and algal polysaccharides isoreactivity substance.
Seaweed species are various and growth is rapid, and the sanitary wastewater row in coastal city containing nutrients such as a large amount of nitrogen phosphorus Enter coastal waters, accelerates the growth and breeding of seaweed.Currently, there is off-season property in China many places littoral zone and sandy beach in a large amount of seaweed The case where invasion, such as 1 annual in recent years ~ March, Beihai Fisheries Base Guangxi Province many places seabeach are just invaded by a large amount of green algaes, seriously When even be continuous several kilometers.The case where such seaweed large area covering coastal waters and seabeach, is with also occurring in other beach in China Area, this can change the original environment of the littoral zone of coastal region and sandy beach, produce adverse effect to its ecological environment and tourist industry. Meanwhile largely discarded seaweed has effectively caused the wasting of resources.
Therefore, it is necessary to use the discarded seaweed on littoral zone and sandy beach, the high-valued of waste seaweed is realized.
Summary of the invention
The present invention is to overcome discarded seaweed described in the above-mentioned prior art to influence ecological environment and result in waste of resources scarce It falls into, discarded seaweed is used, a kind of preparation method of nitrogen-phosphorus-potassium compound fertilizer containing alginic acid is provided, which realizes Waste seaweed it is high-valued.Nitrogen-phosphorus-potassium compound fertilizer as obtained by the preparation method containing alginic acid have nutrition it is balanced, The advantages of disease-resistant yield-increasing, fertilizer conservation synergy, green non-pollution.
Another object of the present invention is to provide a kind of nitrogen-phosphorus-potassium compound fertilizers containing alginic acid.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of preparation method of the nitrogen-phosphorus-potassium compound fertilizer containing alginic acid, includes the following steps:
S1. digestion reaction is carried out after seaweed being pre-processed, and seaweed digestion filtrate is obtained after filtering；The temperature of the digestion reaction It is 50 ~ 60 DEG C, the time is 2 ~ 5 h；
S2. seaweed is digested into filtrate, nitrogenous fertilizer, phosphate fertilizer, potash fertilizer and pH adjusting agent compound, obtains mixed liquor；
S3. mixed liquor is post-processed, obtains the nitrogen-phosphorus-potassium compound fertilizer containing alginic acid.
The present invention is to realize to discard the high-valued of marine algae resource, and a large amount of discarded seaweed is used, one kind is provided The preparation method of nitrogen-phosphorus-potassium compound fertilizer containing alginic acid.The preparation method be first by seaweed in 50 DEG C ~ 60 DEG C 2 ~ 5 h of digestion, Then with nitrogen, phosphorus and potassium fertilizer compound.The temperature of digestion reaction is too low or the reaction time is inadequate, causes digestive pharmaceutical that cannot sufficiently dissolve and mentions The alginic acid in seaweed is taken, so that the content of alginic acid is lower in product；But the excessively high thermal decomposition that will lead to alginate of temperature, So that glycosidic bond is degraded, to reduce the content of alginic acid in product；Also, temperature is excessively high also to reduce alginate solution Viscosity, be unfavorable for subsequent prilling；Too long between when reacted, the alginic acid in product not will increase, and can improve instead Production cost.
Contain a large amount of alginic acid, algal polysaccharides in the nitrogen-phosphorus-potassium compound fertilizer containing alginic acid as prepared by the preparation method Equal natural biologicals disease-resistance substance and active material, plant growth regulating substance also natural containing the basic element of cell division, auxin etc., And sustained-release materials abundant and organic matter, it realizes fertilizer conservation and increases fertilizer efficiency, promote the formation of soil aggregate structure, improve soil Earth physicochemical property.In addition, alginic acid is the extract of natural seaweed, no pollution to the environment avoids soil acidification, soil plate The problems such as knot, heavy metal pollution.
Preferably, the temperature of digestion reaction described in step S1. is 60 DEG C, and the time is 5 h.
Preferably, the amount that water is added in digestion reaction described in step S1. is 4 ~ 6 times of seaweed.The amount that water is added is fewer, The potassium hydroxide for needing to be added is fewer, and potassium content can be lower in the product of preparation, but the concentration of seaweed digestion filtrate is higher, The content of alginic acid is higher in the product of preparation；If the amount that water is added is very few, the problem of due to solubility, so that soluble sea Alginates total amount is very few, causes the alginic acid total amount extracted from Unit Weight seaweed lower, reduces production efficiency.Water is added Amount it is more, need to be added more potassium hydroxide to adjust pH, soluble sylvite is more, so that containing the amount of potassium in product Increase；But the dilutional hyponatremia being added, the concentration that will lead to alginate reduce, the content decline of alginic acid in final product.It is more excellent Selection of land, the amount that water is added in digestion reaction described in step S1. is 5 times of seaweed.
Preferably, the digestive pharmaceutical of digestion reaction described in step S1. is potassium hydroxide.Preferably, disappear described in step S1. The pH for changing reaction is 8 ~ 9.Under neutral and acid condition, seaweed cannot be digested and generate soluble alginate, and when pH is less than 6 When, most of alginate is precipitated, and alginate and other insoluble impurities, only small part sea can not be separated by filtering Alginates are dissolved in filtered filtrate.But pH value is too high, and alginate can agglomerate, and cannot equally be isolated by filtration out Come.
Preferably, seaweed described in step S1. is sargassum, divaricate gelidium thallus, chicken feather algae, leaf caulerpa, Caulerpa racemosa (Forssk) Web V. Bos, long pine One or more of algae, galaxaura, China fir leaf caulerpa, yellow tang.Characteristic of the invention is exactly that raw material sources are extensive, littoral zone and The seaweed at sandy beach can be selected.Recycling largely after discarded seaweed, is prepared for a kind of nitrogen-phosphorus-potassium compound fertilizer containing alginic acid, real Show the high-valued of waste seaweed, and reduces the original ecological environment of littoral zone and sandy beach of coastal region.
Preferably, nitrogenous fertilizer described in step S2. is one of urea, ammonium sulfate, ammonium hydrogen carbonate, potassium nitrate or ammonium nitrate Or it is several.During compound, since seaweed digestion filtrate contains alkaline matter, ammonium nitrogen fertilizer is easy and alkali substance reaction is led The volatilization loss for causing nitrogen causes nitrogen in product to reduce, and generates pungent ammonia and pollute environment；Potassium nitrate is easy Explosive substance is fired, and nitrate nitrogen is excessive, soil leaching loss is too fast, and fertilizer efficiency is not permanent, and polluted underground water etc..And the nitrogen in urea Plain form is different from ammonium hydrogen carbonate, ammonium sulfate etc., big although some can directly be absorbed by crops after it is manured into soil Part is by urase effect, and hydrolysis is just utilized by crop after becoming ammonium carbonate or ammonium hydrogen carbonate.The hydrolysis rate of urea with Temperature is related, and soil temperature is high, and conversion is fast, and fertilizer efficiency is shorter；Soil temperature is low, and conversion is slow, but fertilizer efficiency is longer.Also, except containing nitrogen in urea Outside nutrient, also contain carbon dioxide, facilitates the photosynthesis of crop.Therefore, it is highly preferred that the nitrogenous fertilizer is urea.
Preferably, phosphate fertilizer described in step S2. is one or more of monoammonium phosphate, calcium superphosphate or calcium magnesium phosphate. It can convert in conjunction with iron, aluminium ion containing iron, aluminium etc. impurity, the water-soluble phosphate after moisture absorption in calcium superphosphate and become indissoluble The ferric phosphate and aluminum phosphate of property, to reduce fertilizer efficiency.Calcium magnesium phosphate is alkaline fertilizer, if mixed with ammonium hydrogen carbonate, can be made The volatilization of ammonification reduces fertilizer efficiency, and contains the impurity such as certain heavy metal.Therefore, it is highly preferred that the phosphate fertilizer is phosphoric acid one Ammonium.
Preferably, potash fertilizer described in step S2. is one or more of potassium sulfate, potassium nitrate, potassium carbonate or potassium chloride. Wherein, the hygroscopicity of potassium sulfate is small, prevented from caking, and physical behavior is good, and it is good water soluble potassic fertilizer that application is convenient.Also, Sulphur is the element highly beneficial to crop growth, has a variety of effects in plant metabolism, especially in amino acid egg Play an important role in the forming process of white matter, and on crop protein, grease, vitamin and glucose synthesis influence compared with Greatly.Nitrogen is absorbed by plants should be premised on sulphur exists, and sulphur plays an important role to soil absorption phosphate.Therefore, it is highly preferred that institute Stating potash fertilizer is potassium sulfate.
Preferably, pH adjusting agent described in step S2. is dilute sulfuric acid or dilute hydrochloric acid.It is highly preferred that the pH adjusting agent is Dilute sulfuric acid.Preferably, the concentration of the dilute sulfuric acid is 6%.
Preferably, pretreatment described in step S1. is cleaning, drying, crushes.It is big in various regions coastal waters or seabeach according to seaweed The characteristics of area is bred, the seaweed on regular assigned spot recovery seabeach or coastal waters.The seaweed of recycling is put into the mm size of 5 mm ~ 20 It in the roller separation machine of sieve pore, and is cleaned with high pressure water spray gun, removes silt, isolate all kinds of seaweed cleaned up.Then Seaweed after cleaning is put into dryer, is dried to water content≤15% at 60 DEG C ~ 80 DEG C；Finally by the seaweed of drying It is fitted into pulverizer and is crushed, seaweed shearing is ground into area≤9 cm2The seaweed fragment of size.
Preferably, filtering described in step S1. includes filtering twice.First with gauze by the aqueous solution after digestion reaction into The primary filtering of row, then a filtered fluid is fitted into micro-pore-film filtration tank and carries out secondary filter, obtain seaweed digestion filtrate.Seaweed Digestion filtrate will participate in the organic-inorganic compound technique of next step, and can be used as the use of the adhesive for granulating in prilling.The Primary filtering is to filter out coarse insoluble impurity, and secondary filter is to filter out more tiny insoluble impurity, in two times mistake Filter can effectively reduce filtration time, improve production efficiency.
Preferably, the pH of compound described in step S2. is 6.5 ~ 7.The pH value of fertilizer is excessively high to will cause nutrient loss, such as Nitrogen is released with ammonia；PH value is too low, will appear and is unfavorable for plant absorption, soil acidification aggravation, damages root system of plant etc. to ask Topic.After pH is less than 6 and is greater than 11, the solubility of alginate is reduced, and can be crystallized or be agglomerated out.
In production process, it is envisaged that: due to the aobvious alkalinity of secondary filter liquid, alkaline environment will cause urea and phosphoric acid Nitrogen source loss in monoammonium.Therefore, during the compound described in step S2., first secondary filter liquid is first mixed with potash fertilizer, is adjusted Saved pH be 6.5 ~ 7 after, add nitrogenous fertilizer and phosphate fertilizer, then adjust pH to faintly acid range 6.5 ~ 7.
Preferably, the temperature of compound described in step S2. is 55 DEG C ~ 65 DEG C.Temperature is too low, alginate and inorganic salts Dissolution be not enough, cannot be sufficiently mixed between raw material, and make what is be uniformly mixed between raw material to take a long time, production contains alginic acid Nitrogen-phosphorus-potassium compound fertilizer low efficiency, fertilizer nutrient can also reduce；Temperature is excessively high, will lead to nitrogen and decomposes volatilization loss, seaweed Hydrochlorate is unstable to degrade, and will increase production cost.
In order to keep organic matter and inorganic matter compound abundant, when compound, also needs to be stirred with the revolving speed of 200 r/min.It is excellent Selection of land, the time of stirring described in step S2. are 2 ~ 4 h.If mixing time is insufficient, various nutrient mixing are uneven and react not Sufficiently, compound fertilizer's impurity is caused to remain, salt content is uneven.If mixing time is too long, production cost will increase.
Preferably, post-processing described in step S3. is concentration, drying, crushes, is granulated, drying again.It is dense fluid dewatering will to be mixed Water content is reduced to less than 80%, is then dried to water content≤15% under conditions of 60 DEG C ~ 80 DEG C using dryer；It will drying The N P and K mixture containing alginic acid be put into pulverizer and crush, be ground into diameter≤5 mm solid particle. Smashed solid particle is added in granulating disc, and continues to spray into the secondary filter generated in above-mentioned filtering technique Liquid is granulated.
Preferably, the fertiliser granulates diameter after being granulated described in step S3. is the mm of 3 mm ~ 5.The compound of completion will be granulated Fertiliser granulates are dried to water content 5% ~ 7.5% at 60 DEG C ~ 80 DEG C, are then placed in electric screen grader and are sieved.It will screening Diameter≤3 mm fertiliser granulates repeat to be granulated out, will screen out diameter >=5 mm fertiliser granulates and repeat broken and be granulated, directly Fertiliser granulates diameter to 80% or more is the mm of 3 mm ~ 5.
Preferably, the water content after drying again described in step S3. is no more than 5%.The fertilizer for being the mm of 3 mm ~ 5 by diameter Particle is dried to water content≤5% in 60 DEG C~80 DEG C.Fertilizer sample after randomly selecting drying, detects its alginic acid, nitrogen (N), phosphorus (P2O5), potassium (K2O), sulphur (S) content and water content；By the qualified nitrogen-phosphorus-potassium compound fertilizer metering (50 containing alginic acid Kg) dress is packed in library.
The present invention protects a kind of nitrogen-phosphorus-potassium compound fertilizer containing alginic acid, the nitrogen-phosphorus-potassium compound fertilizer packet containing alginic acid simultaneously Include the raw material of following parts by weight:
Seaweed digests 30 ~ 35 parts of filtrate, and 30 ~ 35 parts of urea, 13 ~ 15 parts of monoammonium phosphate, 13 ~ 15 parts of potassium sulfate, pH adjusting agent is suitable Amount.
Preferably, the nitrogen-phosphorus-potassium compound fertilizer containing alginic acid includes the raw material of following parts by weight:
35 parts of filtrate of seaweed digestion, 35 parts of urea, 15 parts of monoammonium phosphate, 15 parts of potassium sulfate, appropriate pH adjusting agent.
Compared with prior art, the beneficial effects of the present invention are:
The present invention is to realize to discard the high-valued of marine algae resource, using discarded seaweed as primary raw material, is provided a kind of containing alginic acid Nitrogen-phosphorus-potassium compound fertilizer preparation method.The preparation method be first by seaweed in 50 DEG C ~ 60 DEG C 2 ~ 5 h of digestion, then with nitrogen Phosphorus potash fertilizer compound.The content of alginic acid is higher in the prepared nitrogen-phosphorus-potassium compound fertilizer containing alginic acid, has nutrition balanced, disease-resistant The many merits such as volume increase, fertilizer conservation synergy, green non-pollution, meet the high-quality environment-friendly fertilizer of agricultural sustainable development requirement.In addition, After recycling largely discarded seaweed, the original ecological environment of littoral zone and sandy beach of coastal region can be restored.
Detailed description of the invention
Fig. 1 is the process flow chart of the nitrogen-phosphorus-potassium compound fertilizer containing alginic acid.
Specific embodiment
The invention will be further described With reference to embodiment, but embodiments of the present invention are not limited to This.Raw material in embodiment can be by being commercially available；Unless stated otherwise, the present invention uses reagent, method and apparatus for The art conventional reagent, method and apparatus.
Embodiment 1
A kind of preparation method of the nitrogen-phosphorus-potassium compound fertilizer containing alginic acid, the specific steps are as follows:
(1) cleaning separation seaweed: recycling on seabeach or the seaweed in coastal waters, and seaweed is put into the roller of the mm size sieve pore of 5 mm ~ 20 It in seperator, and is cleaned with high pressure water spray gun, removes silt, isolate all kinds of seaweed cleaned up.
(2) it dries broken seaweed: the seaweed after cleaning being put into dryer, is dried under conditions of 60 DEG C ~ 80 DEG C It is≤15% to water content；Then the seaweed of drying is fitted into pulverizer and is crushed, it is≤9 that seaweed shearing, which is ground into area, cm2Fragment.
(3) digestion reaction: the seaweed fragment of crushing and clear water are put into reaction kettle by weight the ratio of 1:5, are added It is 8 ~ 9 that potassium hydroxide, which adjusts aqueous solution pH, is constantly sufficiently stirred, and controls and reacts 5 hours under the conditions of 60 DEG C of temperature, obtains seaweed Digestive juice.
(4) it filters: once being filtered the seaweed digestive juice after digestion reaction first with gauze, then by a filtered fluid It is fitted into micro-pore-film filtration tank and carries out secondary filter, obtain seaweed digestion filtrate, the organic-inorganic compound of next step will be participated in Technique, and can be used as the use of the adhesive for granulating in prilling.
(5) it organic-inorganic compound: takes 35 parts (being by weight) above-mentioned secondary filter liquid to be fitted into reaction kettle, is put into 35 parts Urea, 15 parts of monoammonium phosphate, 15 parts of potassium sulfates, and it is 6.5 ~ 7 that appropriate dilute sulfuric acid (6%), which is added, to adjust the pH value of mixed reaction solution, Under conditions of 55 DEG C ~ 65 DEG C, constantly it is sufficiently stirred 2 ~ 4 hours with the revolving speed of 200 r/min, obtains organic-inorganic mixed liquor.
(6) dries pulverizing is concentrated: above-mentioned organic-inorganic mixing fluid dewatering is concentrated into water content≤80%, then utilizes baking Dry machine is dried to water content≤15% under conditions of 60 DEG C ~ 80 DEG C；The mixture of N P and K containing alginic acid of drying is put into powder It is crushed in broken machine, is ground into the solid particle that diameter is≤5 mm.
(7) it is granulated: above-mentioned smashed solid particle being added in granulating disc, and continues to spray into above-mentioned filterer 6 parts of the secondary filter liquid generated in skill (dilutable water), is granulated.
(8) drying screening: the compound fertilizer granule completed will be granulated and dried, and be put into electric screen grader and sieved.Sieve It separates diameter≤3 mm fertiliser granulates and puts back to repeatedly granulation in above-mentioned granulating disc, diameter >=5 mm particle is then put Enter and repeats broken, then repeatedly granulation, until 80% or more fertiliser granulates diameter is the mm of 3 mm ~ 5 in above-mentioned pulverizer.
(9) dry again: it is 60 DEG C ~ 80 that the fertiliser granulates that the above-mentioned diameter screened out is the mm of 3 mm ~ 5, which are put into temperature, DEG C dryer in, be dried to water content be≤5%.
(10) detection packaging: the nitrogen-phosphorus-potassium compound fertilizer containing alginic acid after randomly selecting drying detects its alginic acid, nitrogen (N), phosphorus (P2O5), potassium (K2O), sulphur (S) content and water content；By qualified alginic acid nitrogen-phosphorus-potassium compound fertilizer metering (50 kg) dress It is packed in library.
Testing result: the nitrogen-phosphorus-potassium compound fertilizer manufactured in the present embodiment containing alginic acid, N P and K total nutrient (N+P2O5 + K2O) weight content is 34%.Wherein, alginic acid 3.1%, N 17.5%, P2O5Available phosphorus percentage is accounted for for 7.5%, water-soluble phosphorus For 80%, K2O is 9%, S 4%, water content 3%.
Embodiment 2
The present embodiment the difference from embodiment 1 is that, the temperature of digestion reaction is 50 DEG C in (3) the step of the present embodiment, the time It is 2 hours；
Other raw material dosages and operating procedure and embodiment 1 are consistent.
Testing result: the nitrogen-phosphorus-potassium compound fertilizer manufactured in the present embodiment containing alginic acid, N P and K total nutrient (N+P2O5 + K2O) weight content is 32%.Wherein, alginic acid 1%, N 17%, P2O5For 7%, water-soluble phosphorus account for available phosphorus percentage be 77%, K2O is 8%, S 3%, water content 4%.
Embodiment 3
The present embodiment the difference from embodiment 1 is that, water of 4 times of seaweed weights is added the step of the present embodiment in (3)；
Other raw material dosages and operating procedure and embodiment 1 are consistent.
Testing result: the nitrogen-phosphorus-potassium compound fertilizer manufactured in the present embodiment containing alginic acid, N P and K total nutrient (N+P2O5 + K2O) weight content is 32%.Wherein, alginic acid 2.2%, N 16%, P2O5Accounting for available phosphorus percentage for 7%, water-soluble phosphorus is 79%、K2O is 9%, S 4%, water content 4%.
Embodiment 4
The present embodiment the difference from embodiment 1 is that, water of 6 times of seaweed weights is added the step of the present embodiment in (3)；
Other raw material dosages and operating procedure and embodiment 1 are consistent.
Testing result: the nitrogen-phosphorus-potassium compound fertilizer manufactured in the present embodiment containing alginic acid, N P and K total nutrient (N+P2O5 + K2O) weight content is 33%.Wherein, alginic acid 1.7%, N 16%, P2O5Accounting for available phosphorus percentage for 7%, water-soluble phosphorus is 78%、K2O is 10%, S 4%, water content 5%.
Embodiment 5
The present embodiment the difference from embodiment 1 is that, secondary filter liquid is 30 parts in (5) the step of the present embodiment；
Other raw material dosages and operating procedure and embodiment 1 are consistent.
Testing result: the nitrogen-phosphorus-potassium compound fertilizer manufactured in the present embodiment containing alginic acid, N P and K total nutrient (N+P2O5 + K2O) weight content is 34%.Wherein, alginic acid 1.1%, N 18%, P2O5Accounting for available phosphorus percentage for 8%, water-soluble phosphorus is 77%、K2O is 8%, S 4%, water content 3%.
Embodiment 6
The present embodiment the difference from embodiment 1 is that, secondary filter liquid is 30 parts in (5) the step of the present embodiment, urea 30 Part；
Other raw material dosages and operating procedure and embodiment 1 are consistent.
Testing result: the nitrogen-phosphorus-potassium compound fertilizer manufactured in the present embodiment containing alginic acid, N P and K total nutrient (N+P2O5 + K2O) weight content is 31%.Wherein, alginic acid 1.5%, N 14%, P2O5Accounting for available phosphorus percentage for 8.5%, water-soluble phosphorus is 77%、K2O is 8.5%, S 4.5%, water content 4%.
Comparative example 1
This comparative example the difference from embodiment 1 is that, the temperature of digestion reaction is 40 DEG C in (3) the step of this comparative example, the time It is 2 hours；
Other raw material dosages and operating procedure and embodiment 1 are consistent.
Testing result: the nitrogen-phosphorus-potassium compound fertilizer manufactured in the present embodiment containing alginic acid, N P and K total nutrient (N+P2O5 + K2O) weight content is 33%.Wherein, alginic acid 0.5%, N 17%, P2O5Accounting for available phosphorus percentage for 7%, water-soluble phosphorus is 76%、K2O is 9%, S 4%, water content 4%.
It follows that the present invention is by the temperature of control digestion reaction, time and the amount that water is added, prepared contains sea The content of alginic acid is higher in the nitrogen-phosphorus-potassium compound fertilizer of alginic acid, N P and K total nutrient (N+P2O5 + K2O) weight content >= 31%.Wherein, alginic acid >=1%, N >=14%, P2O5>=7%, water-soluble phosphorus accounts for available phosphorus percentage >=77%, K2O >=8%, S >=3%, Water content≤5%.The nitrogen-phosphorus-potassium compound fertilizer containing alginic acid meets requirement of the national standard GB 15063-2009 to compound fertilizer, also accords with Close requirement of the country chemical standard HG/T 5050-2016 to alginic acid compound fertilizer.
As it can be seen that the present invention largely discards seaweed by recycling, it is prepared for a kind of nitrogen-phosphorus-potassium compound fertilizer containing alginic acid, it is real Show the high-valued of discarded marine algae resource, reduces the original ecological environment of littoral zone and sandy beach of coastal region.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention Protection scope within.

Claims (10)

1. a kind of preparation method of the nitrogen-phosphorus-potassium compound fertilizer containing alginic acid, which comprises the steps of:
S1. digestion reaction is carried out after seaweed being pre-processed, and seaweed digestion filtrate is obtained after filtering；The temperature of the digestion reaction It is 50 ~ 60 DEG C, the time is 2 ~ 5 h；
S2. seaweed is digested into filtrate, nitrogenous fertilizer, phosphate fertilizer, potash fertilizer and pH adjusting agent compound, obtains mixed liquor；
S3. mixed liquor is post-processed, obtains the nitrogen-phosphorus-potassium compound fertilizer containing alginic acid.
2. preparation method according to claim 1, which is characterized in that the temperature of digestion reaction described in step S1. is 60 DEG C, the time is 5 h.
3. preparation method according to claim 1, which is characterized in that water is added in digestion reaction described in step S1. Amount is 4 ~ 6 times of seaweed.
4. preparation method according to claim 3, which is characterized in that water is added in digestion reaction described in step S1. Amount is 5 times of seaweed.
5. preparation method according to claim 1, which is characterized in that seaweed described in step S1. is sargassum, small parmelia saxatilis One or more of dish, chicken feather algae, leaf caulerpa, Caulerpa racemosa (Forssk) Web V. Bos, long loose algae, galaxaura, China fir leaf caulerpa or yellow tang.
6. preparation method according to claim 1, which is characterized in that the temperature of compound described in step S2. be 55 DEG C ~ 65 ℃。
7. preparation method according to claim 1, which is characterized in that nitrogenous fertilizer described in step S2. be urea, ammonium sulfate, One or more of ammonium hydrogen carbonate, potassium nitrate or ammonium nitrate.
8. preparation method according to claim 1, which is characterized in that phosphate fertilizer described in step S2. is monoammonium phosphate, crosses phosphorus One or more of sour calcium or calcium magnesium phosphate.
9. preparation method according to claim 1, which is characterized in that potash fertilizer described in step S2. is potassium sulfate, nitric acid One or more of potassium, potassium carbonate or potassium chloride.
10. a kind of nitrogen-phosphorus-potassium compound fertilizer containing alginic acid, which is characterized in that the raw material including following parts by weight:
Seaweed digests 30 ~ 35 parts of filtrate, and 30 ~ 35 parts of urea, 13 ~ 15 parts of monoammonium phosphate, 13 ~ 15 parts of potassium sulfate, pH adjusting agent is suitable Amount.
CN201811223004.0A 2018-10-19 2018-10-19 A kind of nitrogen-phosphorus-potassium compound fertilizer and preparation method thereof containing alginic acid Pending CN109081740A (en)

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