CN109608248A - A kind of charcoal composite bentonite base phosphorus potassium slow release fertilizer and preparation method thereof - Google Patents
A kind of charcoal composite bentonite base phosphorus potassium slow release fertilizer and preparation method thereof Download PDFInfo
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- CN109608248A CN109608248A CN201910080472.5A CN201910080472A CN109608248A CN 109608248 A CN109608248 A CN 109608248A CN 201910080472 A CN201910080472 A CN 201910080472A CN 109608248 A CN109608248 A CN 109608248A
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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
This hair provides a kind of charcoal composite bentonite base phosphorus potassium slow release fertilizer, belongs to chemical engineering and agricultural technology field.The slow-release fertilizer includes the raw material of following parts by weight: 40~80 parts of biomass, 10~30 parts of bentonite and 10~30 parts of phosphorus potash fertilizer.The present invention reacts one-step synthesis by the way that biomass, bentonite and phosphorus potash fertilizer proportion, using microwave cracking.It is supported on fertilizer in biomass, achievees the effect that slow release, to improve the utilization rate of fertilizer.
Description
Technical field
The present invention relates to chemical engineerings and agricultural technology field, and in particular to a kind of charcoal composite bentonite base phosphorus potassium is slow
Release fertilizer and preparation method thereof.
Background technique
China is large agricultural country, and agricultural is the basis of the development of the national economy and development.In order to improve yield, the use of chemical fertilizer
Amount is continuously increased, but is applied excessive chemical fertilizer and caused soil hardening and cracking, in addition, existing chemical fertilizer dissolves too fast, fertilizer nutrient
Release characteristics cannot match with plant nutrient absorbing rule well causes the utilization rate of fertilizer low, according to investigation, China's nitrogen
The utilization rate of fertilizer is only 30~40%, and phosphate fertilizer is 10~25%, and potash fertilizer is 30~45%.
Slow release fertilizer refers to that nutrient slow release is controlled, and single-dose application can satisfy the need in crop entire growth period
It wants, it being capable of slow release or the fertilizer by crop regulation of fertilizer requirement supply nutrient.Since such fertilizer nutrient release rate is compared with conventional fertilizer
Slowly, the nutrient released is absorbed by crops material quickly, and such fertilizer loss rate just will be greatly reduced, and utilization rate will mention significantly
Height, to achieve the purpose that reduce rate of fertilizer and protect environment, improvement soil, keep soil from packing together.
It is research both domestic and external by developing and improving using charcoal fertilizer farmland fertilizer utilization rate and improve soil
Hot spot.Most of charcoal fertilizer currently on the market is all based on traditional crack biomass production charcoal, but this kind of biology
Charcoal fertilizer, structure function are single, beneficial element retains less, pore structure is irregular, do not have slow releasing function to fertilizer, while cracking
In the process, pollution is easily caused, significantly limits charcoal fertilizer in the large-scale promotion application of agriculture field.
Summary of the invention
In consideration of it, the present invention provides a kind of charcoal composite bentonite base phosphorus potassium slow release fertilizer and preparation method thereof, this hair
The slow-release fertilizer of bright offer has preferable sustained release performance, and utilization rate of fertilizer is high.
To solve the above-mentioned problems, the present invention provides following technical schemes:
The present invention provides a kind of charcoal composite bentonite base phosphorus potassium slow release fertilizer, the raw materials including following parts by weight: raw
40~80 parts of substance, 10~30 parts of bentonite and 10~30 parts of phosphorus potash fertilizer.
Preferably, the biomass includes one or more of agricultural crop straw, corncob, shell and jujube wood.
Preferably, the phosphorus potash fertilizer includes KCl, KH2PO4、K2HPO4、(NH3)3PO4Or H3PO4One or more of.
The present invention provides a kind of preparation methods of slow-release fertilizer described in above scheme, include the following steps:
1) biomass is successively crushed and is sieved, obtain powdered biomass；
2) bentonite is purified, obtains purifying bentonite；
3) powdered biomass of the step 1), the purifying bentonite of the step 2), phosphorus potash fertilizer are mixed with water, successively
It is stirred, stands, dries and crushes, obtain pre-composition；
4) pre-composition of the step 3) is subjected to microwave cracking reaction, obtains charcoal composite bentonite base phosphorus potassium slow release
Fertilizer；
The step 1) and 2) the not restriction of time sequencing.
Preferably, the mode purified in the step 2) includes: to mix bentonite with water, is successively centrifuged, is sieved,
Obtained screenings is purifying bentonite.
Preferably, temperature dry in the step 3) is 95~105 DEG C.
Preferably, powdered biomass, the volume ratio of the total volume of purifying bentonite and phosphorus potash fertilizer and water in the step 3)
For 1:8~16.
Preferably, the revolving speed stirred in the step 3) is 450~900r/min；The time of stirring is 30~60min.
Preferably, the time stood in the step 3) is 22~26h.
Preferably, the reaction condition that microwave cracking reacts in the step 4) includes: oxygen atmosphere vacuum degree: 0.05~
0.1MPa, power: 500~1000W and reaction time: 15~60min.
Compared with prior art, technical solution provided by the invention has the advantage that
The present invention provides a kind of charcoal composite bentonite base phosphorus potassium slow release fertilizer, the raw materials including following parts by weight: raw
40~80 parts of substance, 10~30 parts of bentonite and 10~30 parts of phosphorus potash fertilizer.In the present invention, the bentonite can be used as one kind
Strong microwave absorption improves the utilization rate to microwave, promotes immobilization of the fertilizer in biomass, on the other hand, bentonite contains
There are Si-O tetrahedron and Al-O octahedron unique texture, catalyst action can be played, can speed up the cracking of cotton stalk, is cracking
In the process, the quality, specific surface area and physical structure of charcoal can be improved in bentonite；Chemical fertilizer not only can be in cracking process
As activator, distinctive functional group in activated biomassReinforce the load capacity to P and K
(content of P and K are respectively 32.06%, 20.25% or more), moreover, itself is also a kind of source of manure, can provide for plant must
The nutriment wanted, many microelements can be supported on charcoal duct and surface, remain plant essential nutrients (Zn, Ca,
Mg, Fe, Al) high-content.Fertilizer, which is solidificated in charcoal, simultaneously obtains slow release.
The present invention also provides the preparation methods of charcoal composite bentonite base phosphorus potassium slow release fertilizer described above, using microwave
Reaction carries out rapid cleavage.In cracking process, bentonite, phosphorus potash fertilizer and biomass interaction react to each other, keep fertilizer negative
It is loaded on charcoal, achievees the effect that slow release, to improve the utilization rate of fertilizer.This method is using one-step synthesis simultaneously
Method, it is efficient and convenient, it is easy large-scale production.
Detailed description of the invention
Fig. 1 is the electron-microscope scanning figure of charcoal composite bentonite base phosphorus potassium slow release fertilizer obtained in embodiment 1.
Specific embodiment
The present invention provides a kind of charcoal composite bentonite base phosphorus potassium slow release fertilizer, the raw materials including following parts by weight: raw
40~80 parts of substance, 10~30 parts of bentonite and 10~30 parts of phosphorus potash fertilizer.
It include biomass in charcoal composite bentonite base phosphorus potassium slow release fertilizer provided by the invention.By weight, including
40~80 parts, preferably 50~70 parts, more preferably 60 parts.In the present invention, the biomass preferably include agricultural crop straw,
One or more of corncob, shell and jujube wood.In the present invention, the agricultural crop straw be preferably cotton stalk and/or
Corn stover.In the present invention, the biomass generates charcoal in microwave reaction, provides carrier for fertilizer, consolidates chemical fertilizer
Change on charcoal, reduces the rate of release of chemical fertilizer.The present invention is not particularly limited the source of the biomass, using ability
Domain conventional commercial product.
It include bentonite in charcoal composite bentonite base phosphorus potassium slow release fertilizer provided by the invention.By weight, including
10~30 parts, preferably 15~25 parts, more preferably 20 parts.In the present invention, the bentonite is preferably sodium bentonite, calcium
One or more of base bentonite, hydrogen-based bentonite and sodium calcium mixing base bentonite.Simple biomass and fertilizer are in lower function
It is poor that microwave property is absorbed under rate, fertilizer cannot be made effectively to be supported in charcoal, in the present invention, the bentonite can be with
The utilization rate to microwave is improved as a kind of strong microwave absorption, promotes immobilization of the fertilizer in charcoal, on the other hand,
Bentonite contains Si-O tetrahedron and Al-O octahedron unique texture, can play catalyst action, can speed up splitting for cotton stalk
Solution, in cracking process, the quality, specific surface area and physical structure of charcoal is can be improved in bentonite.The present invention is to described swollen
The source of profit soil is not particularly limited, using this field conventional commercial product.
It include phosphorus potash fertilizer in charcoal composite bentonite base phosphorus potassium slow release fertilizer provided by the invention.By weight, including
10~30 parts, preferably 15~25 parts, more preferably 20 parts.In the present invention, the phosphorus potash fertilizer preferably includes KCl, KH2PO4、
K2HPO4、(NH3)3PO4Or H3PO4One or more of.In the present invention, the phosphorus potash fertilizer not only can be in cracking process
As activator, distinctive functional group in activated biomassReinforce the load to P and K
It measures (content of P and K are respectively 32.06%, 20.25% or more), moreover, itself is also a kind of source of manure, can be provided for plant
Necessary nutriment, many microelements can be supported on charcoal duct and surface, remain plant essential nutrients (Zn,
Ca,Mg,Fe,Al).The present invention is not particularly limited the source of the chemical fertilizer, using this field conventional commercial product.
The present invention provides a kind of preparation methods of slow-release fertilizer described in above scheme, include the following steps:
1) biomass is successively crushed and is sieved, obtain powdered biomass；
2) bentonite is purified, obtains purifying bentonite；
3) powdered biomass of the step 1), the purifying bentonite of the step 2), phosphorus potash fertilizer are mixed with water, successively
It is stirred, stands, dries and crushes, obtain pre-composition；
4) pre-composition of the step 3) is subjected to microwave cracking reaction, obtains charcoal composite bentonite base phosphorus potassium slow release
Fertilizer；
The step 1) and 2) the not restriction of time sequencing.
Biomass is successively crushed and is sieved by the present invention, obtains powdered biomass.In the present invention, in the crushing
It is preceding preferably to be cut, washed, dried.In the present invention, the length of the cutting is preferably 2~4cm.In the present invention, institute
Stating dry temperature is preferably 95~105 DEG C, and more preferably 100 DEG C.In the present invention, the biomass water content after drying is preferred
For not higher than 2%.The present invention is not particularly limited the cutting, washing, mode that is dry and crushing, using this field routine
Mode.In the present invention, the aperture of the sieving is preferably 50~100 mesh.
The present invention purifies bentonite, obtains purifying bentonite.In the present invention, the mode of the purifying is preferred
Are as follows: bentonite is mixed with water, is successively centrifuged, is sieved, obtained screenings is purifying bentonite.In the present invention, institute
The volume ratio for stating bentonite and water is preferably 1:70~100, more preferably 1:80.In the present invention, the revolving speed of the centrifugation is excellent
It is selected as 1200~2500r/min, more preferably 2000r/min；The time of the centrifugation is preferably 15~25min, more preferably
20min.In the present invention, the mesh number of the sieving is preferably 70~90 mesh, more preferably 80 mesh.
After obtaining powdered biomass and purifying bentonite, the present invention is by the powdered biomass, the purifying bentonite, phosphorus
Potash fertilizer is mixed with water, is successively stirred, stands, dries and is crushed, obtains pre-composition.In the present invention, the biomass powder
End, purifying bentonite and the total volume of phosphorus potash fertilizer and the volume ratio of water are preferably 1:8~16, more preferably 1:12.In the present invention
In, the revolving speed of the stirring is preferably 450~900r/min, more preferably 700r/min；The time of the stirring is preferably 30
~60min, more preferably 45min.In the present invention, the time of the standing is preferably 22~26h, more preferably for 24 hours.This hair
The bright temperature to the standing is not particularly limited, and is carried out at normal temperature.The present invention is stirred, and standing can accelerate fertilizer
Material, bentonite enters the inside of biomass, in cracking process, so that fertilizer is securely seated between in charcoal, reaches slow
Release effect.The present invention is not particularly limited the mode of the drying, crushing, using this field usual manner.In this hair
In bright, the temperature of the drying is preferably 95~105 DEG C, and more preferably 100 DEG C.In the present invention, the mixture after drying contains
Water is preferably not higher than 2%.After crushing, the present invention is preferably sieved.In the present invention, the aperture of the sieving is preferably
70~100 mesh.
After obtaining pre-composition, the pre-composition is carried out microwave cracking reaction by the present invention, obtains charcoal composite bentonite
Base phosphorus potassium slow release fertilizer.In the present invention, the reaction condition of the microwave cracking reaction preferably includes: oxygen atmosphere vacuum degree 0.05~
0.1MPa, 500~1000W of power and reaction time: 15~60min.In the present invention, when the microwave cracking reacts, oxygen
Atmosphere vacuum degree is preferably 0.08MPa；Power is preferably 750W；The microwave cracking reaction time is preferably 40min.In the present invention,
The microwave cracking reaction carries out preferably in the microwave reactor containing quartz ampoule.In the present invention, reaction mass with it is described
The volume ratio of microwave reactor is preferably 1:8~15, more preferably 1:10.The present invention does not have the source of the microwave reactor
Particular determination, using this field conventional commercial product.In the present invention, after microwave reaction, it is also preferable to include what will be obtained
Reactant crosses 0.5~1mm sieve.
In the present invention, it is reacted by microwave cracking, raw material can be made to crack, biomass mainly has lignin, hemicellulose
Element and cellulose composition, these ingredients contain multiple functional groups, carboxyl, hydroxyl, ether amino and microelement.It was cracked in raw material
Cheng Zhong, cellulose, hemicellulose, lignin occur dehydration, decarboxylic reaction, deoxygenation, carbonize as charcoal compound fertilizer,
It is reacted simultaneously by microwave cracking, biomass starting material, bentonite and chemical fertilizer are reacted, and charcoal composite bentonite base is obtained
Phosphorus potassium slow release fertilizer.
In order to further illustrate the present invention, technical solution provided by the invention is retouched in detail below with reference to embodiment
It states, but they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1
(1) cotton stalk is cut into 2~4cm, is 2% in 95 DEG C of dryings to water content, by cutting after drying after being washed with water
It cuts after cotton stalk crushed, crosses 80 meshes, obtain cotton stalk powder end；
(2) sodium bentonite is selected, sodium bentonite is mixed with water according to the volume ratio of 1:70, with 1200r/min's
After revolving speed is centrifuged 25min, 70 meshes are crossed, obtain purifying sodium bentonite.
(3) by weight percentage, stalk powder 70%, H are selected3PO410%, KH2PO410%, sodium bentonite is purified
10%, it is soluble in water by the volume ratio of 1:10,40min is stirred with the revolving speed of 600r/min, it, will be upper after standing 22h at room temperature
Stating solution and being dried at 105 DEG C to water content is 2%, is carried out smashing it through 70 meshes with pulverizer, obtained screenings is received
Collect spare；
(4) it transfers the sample into quartz ampoule and is placed in microwave heating pyrolysis (material and reactor body in microwave reactor
Product is than 1:10, limited oxygen atmosphere vacuum degree 0.07Mpa, power 600W, reaction time 30min), pyrolysis gas purification has been reacted
Finish reactor natural cooling, takes out sample, be screened to the uniform-dimension of 0.5mm, obtain charcoal composite bentonite base phosphorus potassium
Slow-release fertilizer.Obtained charcoal composite bentonite base phosphorus potassium slow release fertilizer is scanned using Electronic Speculum, concrete outcome such as Fig. 1 institute
Show, as seen from Figure 1, fertilizer can be supported on charcoal duct and surface in the slow-release fertilizer that the present invention is prepared.
Embodiment 2
(1) corncob and cornstalk are cut into 2~4cm, after being washed with water, are 2% in 95 DEG C of dryings to water content, will do
After cutting corn after dry is crushed, 70 meshes are crossed, corncob and cornstalk powder are obtained；
(2) sodium base is selected, calcium-base bentonite, by sodium base, calcium-base bentonite is mixed with water according to the volume ratio of 1:70 respectively,
After being centrifuged 25min with the revolving speed of 1200r/min, 80 meshes are crossed, obtain purifying sodium base, calcium-base bentonite.
(3) by weight percentage, corncob and cornstalk powder 70%, H are selected3PO45%, KCl10%,
KH2PO45%, sodium base and calcium-base bentonite 10% (sodium base and calcium-base bentonite ratio 1:1) are purified, is dissolved in by the volume ratio of 1:10
In water, 50min is stirred with the revolving speed of 600r/min, stands 26h at room temperature, above-mentioned solution is dried at 100 DEG C to aqueous
Amount is 2%, is carried out smashing it through 100 meshes with pulverizer, obtained screenings is collected spare；
(4) it transfers the sample into quartz ampoule and is placed in microwave heating pyrolysis (material and reactor body in microwave reactor
Product is than 1:15, limited oxygen atmosphere vacuum degree 0.07Mpa, power 500W, reaction time 30min), pyrolysis gas purification has been reacted
Finish reactor natural cooling, takes out sample, be screened to the uniform-dimension of 0.5~1mm, obtain charcoal composite bentonite base phosphorus
Potassium slow-release fertilizer.
Embodiment 3
(1) after shell being washed with water, it is 2% in 105 DEG C of dryings to water content, the shell after drying is crossed into 70 meshes,
Obtain shell powder；
(2) calcium base, hydrogen-based bentonite are selected, calcium base, hydrogen-based bentonite are mixed with water according to the volume ratio of 1:100 respectively
It closes, after being centrifuged 15min with the revolving speed of 2500r/min, crosses 80 meshes, obtain purifying calcium base, hydrogen-based bentonite.
(3) by weight percentage, shell powder 55%, H are selected3PO45%, K2HPO410%, KH2PO410%, it purifies
Hydrogen-based and calcium-base bentonite 20% (hydrogen-based, calcium-base bentonite ratio 1:1), it is soluble in water by the volume ratio of 1:20, with 800r/
The revolving speed of min stirs 50min, and after standing for 24 hours at room temperature, above-mentioned solution is dried at 100 DEG C to water content is 2%, uses
Pulverizer carries out smashing it through 70 meshes, obtained screenings is collected spare；
(4) it transfers the sample into quartz ampoule and is placed in microwave heating pyrolysis (material and reactor body in microwave reactor
Product is than 1:15, limited oxygen atmosphere vacuum degree 0.08Mpa, power 550W, reaction time 25min), pyrolysis gas purification has been reacted
Finish reactor natural cooling, takes out sample, be screened to the uniform-dimension of 0.5~1mm, obtain charcoal composite bentonite base phosphorus
Potassium slow-release fertilizer.
Embodiment 4
(1) jujube wood is cut into 2~4cm, is 2% in 100 DEG C of dryings to water content after being washed with water, the cutting that will be obtained
After jujube wood is crushed, 60 meshes are crossed, jujube wood powder is obtained；
(2) sodium base, calcium base, hydrogen-based bentonite are selected, by sodium base, calcium base, hydrogen-based bentonite respectively with water according to 1:100's
Volume ratio mixing after being centrifuged 15min with the revolving speed of 2500r/min, crosses 80 meshes, obtains purifying sodium base, calcium base, hydrogen-based swelling
Soil.
(3) by weight percentage, jujube wood powder 55%, KOH 5%, K are selected2HPO410%, purify hydrogen-based, sodium base with
Calcium-base bentonite 30% (hydrogen-based, sodium base and calcium-base bentonite ratio 1:1:1), it is soluble in water by the volume ratio of 1:15, with 900r/
The revolving speed of min stirs 60min, and after standing for 24 hours at room temperature, above-mentioned solution is dried at 100 DEG C to water content is 2%, uses
Pulverizer carries out smashing it through 80 meshes, obtained screenings is collected spare；
(4) it transfers the sample into quartz ampoule and is placed in microwave heating pyrolysis, material and reactor body in microwave reactor
Product is than 1:15, and limited oxygen atmosphere vacuum degree 0.08Mpa, power 750W, the reaction time 15 minutes, pyrolysis gas purification was reacted
Finish reactor natural cooling, take out sample, be screened to the uniform-dimension of 0.5~1mm, a kind of obtained multifunctional bio charcoal is slow
Shi Xing compound fertilizer.
Reference examples 1
In addition to without the microwave heating pyrolytic reaction of step (4), other operations are identical with embodiment 1, obtain
Compound fertilizer is as a control group.
Embodiment 5
The compound fertilizer being prepared with reference examples 1 as a control group, using Examples 1 to 4 as experimental group, measurement pair respectively
According to group and the performance parameter of experimental group fertilizer, and phosphorus and Potassium release amount and utilization rate, concrete outcome such as table 1 are measured after 20 days
It is described.
The performance parameter of 1 different fertilizer of table
Note: A, B, C, D respectively represent the product in specific embodiment 1,2,3 and 4.
As can be seen from Table 1, the fertilizer that the present invention is prepared has slow release effect, and the utilization rate height of phosphorus and potassium is compared
In control group, sustained release performance is significantly improved.
Embodiment 6
The 10g fertilizer that the embodiment of the present invention 1~4 is prepared is uniformly mixed with 200g soil respectively and keeps the humidity to be
60%, then this culture substrate is transferred in small flower, then each basin is placed in germination box, 10 are embedded in each basin
Pepper seed, at the same be arranged control group (control group except using reference examples 1 compound fertilizer in addition to, other operation with experimental group difference phase
Together), the germination percentage and items growth indexes, physical signs of three groups of capsicums of statistical comparison, tool are observed under same growing environment
The results are shown in Table 2 for body.
Every growth indexes of capsicum under 2 different fertilizer of table
| Processing | Germination percentage (%) | Average root long (cm) | Average stem length (cm) | Mean fresh (g) | Average dry weight (g) |
| Control group | 85.43 | 7.56 | 23.73 | 2.79 | 0.36 |
| A | 95.23 | 9.20 | 15.67 | 3.40 | 0.48 |
| B | 95.56 | 9.40 | 16.34 | 3.60 | 0.45 |
| C | 96.27 | 8.10 | 16.20 | 3.73 | 0.52 |
| D | 97.03 | 10.00 | 17.20 | 3.76 | 0.55 |
Note: A, B, C, D respectively represent the product in specific embodiment 1,2,3 and 4.
As can be seen from Table 2, after charcoal composite bentonite base phosphorus potassium slow release fertilizer prepared by the present invention is to capsicum application,
Under identical processing, the germination percentage of experimental group capsicum is 95.23%~97.03%, and every growth indexes of capsicum are improved,
The results showed that charcoal composite bentonite base phosphorus potassium slow release fertilizer prepared by the present invention has good growgh promoting effects to capsicum,
It can be used as the fertilizer of plant and crops.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of charcoal composite bentonite base phosphorus potassium slow release fertilizer, which is characterized in that the raw material including following parts by weight: biomass
40~80 parts, 10~30 parts of bentonite and 10~30 parts of phosphorus potash fertilizer.
2. slow-release fertilizer according to claim 1, which is characterized in that the biomass includes agricultural crop straw, corncob, fruit
One or more of shell and jujube wood.
3. slow-release fertilizer according to claim 1, which is characterized in that the phosphorus potash fertilizer includes KCl, KH2PO4、K2HPO4、
(NH3)3PO4Or H3PO4One or more of.
4. the preparation method of slow-release fertilizer described in claims 1 to 3 any one, includes the following steps:
1) biomass is successively crushed and is sieved, obtain powdered biomass；
2) bentonite is purified, obtains purifying bentonite；
3) powdered biomass of the step 1), the purifying bentonite of the step 2), phosphorus potash fertilizer are mixed with water, is successively carried out
Stirring is stood, dry and crushing, obtains pre-composition；
4) pre-composition of the step 3) is subjected to microwave cracking reaction, obtains charcoal composite bentonite base phosphorus potassium slow release fertilizer；
The step 1) and 2) the not restriction of time sequencing.
5. the preparation method according to claim 4, which is characterized in that the mode purified in the step 2) includes: will be swollen
Profit soil is mixed with water, is successively centrifuged, is sieved, and obtained screenings is purifying bentonite.
6. the preparation method according to claim 4, which is characterized in that dry temperature is 95~105 in the step 3)
℃。
7. the preparation method according to claim 4 or 6, which is characterized in that powdered biomass, purifying are swollen in the step 3)
The volume ratio of the total volume and water of profit soil and phosphorus potash fertilizer is 1:8~16.
8. the preparation method according to claim 4 or 6, which is characterized in that the revolving speed stirred in the step 3) is 450~
900r/min；The time of stirring is 30~60min.
9. the preparation method according to claim 4 or 6, which is characterized in that the time stood in the step 3) is 22~
26h。
10. the preparation method according to claim 4, which is characterized in that the reaction that microwave cracking reacts in the step 4)
Condition includes: oxygen atmosphere vacuum degree: 0.05~0.1MPa, power: 500~1000W and reaction time: 15~60min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112062632A (en) * | 2020-08-28 | 2020-12-11 | 西安工程大学 | Synthetic method of coated biochar slow-release fertilizer |
| CN113004902A (en) * | 2021-02-09 | 2021-06-22 | 西安工程大学 | Method for preparing biochar by co-pyrolyzing bentonite and metal |
| CN113604225A (en) * | 2021-08-10 | 2021-11-05 | 广东石油化工学院 | Soil pollution-control and yield-increase bidirectional regulation material and preparation method thereof |
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