CN102180739B - Coating pulp for controlled release fertilizer and production method thereof - Google Patents
Coating pulp for controlled release fertilizer and production method thereof Download PDFInfo
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- CN102180739B CN102180739B CN 201110070326 CN201110070326A CN102180739B CN 102180739 B CN102180739 B CN 102180739B CN 201110070326 CN201110070326 CN 201110070326 CN 201110070326 A CN201110070326 A CN 201110070326A CN 102180739 B CN102180739 B CN 102180739B
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Abstract
The invention relates to a coating pulp for a controlled release fertilizer and a production method and application thereof, belonging to the technical field of fertilizer industry. The production method of the coating pulp includes the following steps: preparing rice straw or wheat straw into straw thickened pulp; mixing diluted hydrochloric acid with high-density chitosan, and stirring the mixture into high-density chitosan pulp under the condition of 30-50 DEG C; and then mixing the straw thickened pulp with the high-density chitosan pulp, thus obtaining the coating pulp. In ammonia atmosphere, a granular fertilizer is immersed in the coating pulp to form a wrapping film on the surface of the granular fertilizer by the coating pulp; and then the granular fertilizer is dried and cured in dry ammonia atmosphere, thus obtaining the coated biological controlled release fertilizer. The coating pulp also can be sprayed on the surface of the granular fertilizer in the ammonia atmosphere to form the wrapping film on the surface of the granular fertilizer by the coating pulp; and then the granular fertilizer is dried and cured in the dry ammonia atmosphere, thus obtaining the coated biological controlled release fertilizer. The invention can be used for producing the controlled release fertilizer with the coating pulp, and is applicable to the production for preparing an inorganic fertilizer or a compound fertilizer into the biological type controlled release fertilizer.
Description
Technical field
The invention belongs to the fertilizer industry technical field, particularly the coated fertilizer production technical field of slowly-releasing and release and release control fertilizer.
Background technology
In the last few years, international and domestic Slow/Controlled Release Fertilizers output, consumption were mainly used in non-agricultural field and human consumer's family expenses all in steady-state growth, did not obtain than quantum jump at agriculture field, were genuine " noble's fertilizer ".China is chemical fertilizers production and uses big country, but is not also chemical fertilizers production and the power that uses.At present, global-type inflation, grain and the energy all go up, although China's grain yield realizes volume increase for years, the too fast China's grain security of still giving of the means of agricultural production price increase such as chemical fertilizer has been brought hidden danger to a certain degree.The research and development Slow or controlled release fertilizer can ensure sustainable use, raising utilization rate of fertilizer, the minimizing pollution in China farmland, being development of national fertilizer industry, the needs that improve product competitiveness, is also the needs of resource-conserving and environment-friendly society.If the production prices of slow-release fertilizer descend, chemical fertilizer utilization ratio is high, ecological availability is high and have fewer environmental impacts or minimum, for improving chemical fertilizer utilization ratio, reduce nutrient loss, reducing the aspects such as labour intensity, Control the Plan Pollution Sources and provide the utmost point to have broad application prospects.
The properties and applications gordian technique of release and release control fertilizer is coating composition, character and preparation technology.In the development of polymer coated fertilizer, determining and optimizing of polymer coated fertilizer slowly-releasing parameter is slow release fertilizer development and one of core technology of using.The polymer capsule technology mainly contains: polyolefine coating, pitch and paraffin mixing coating, sulphur dressing, thermoplastic resin membrane wrapping.If but the polymkeric substance of life-time service hard degradation certainly will bring serious environmental problem to soil as coating.Therefore, develop cheap, environmentally friendly biological controlled-released fertilizer, will have very important practical significance and application prospect.
Summary of the invention
The object of the invention is to propose a kind of slowly-releasing and control-release function that not only has fertilizer, also has simultaneously the coating slurry of the release and release control fertilizer of cheap, eco-friendly two-fold advantage.
The present invention mainly is comprised of paddy stalk or wheat straw bar, high chitosan and hydrochloric acid.
The mass ratio of described paddy stalk or wheat straw bar, high chitosan and hydrochloric acid is 5～15 ︰ 2～5 ︰ 0.1～3.
The present invention takes full advantage of abundant straw resource, the matrix take paddy stalk or wheat straw bar as main biological slow-released wrap film.The present invention is fully utilized straw, has also greatly reduced simultaneously consumption and the preparation temperature of high chitosan, has saved the energy, has reduced the cost of release and release control fertilizer.
Another purpose of the present invention is to propose the production method of the coating slurry of release and release control fertilizer:
Paddy stalk or wheat straw bar are made the straw underflow; Dilute hydrochloric acid is mixed with high chitosan, stir into high chitosan slurry under 30～50 ℃ of conditions; Again the straw underflow is mixed with high chitosan slurry, make the coating slurry.
In preparation process of the present invention to add hydrochloric acid be easily to disperse, dissolve for the high chitosan that makes indissoluble, high chitosan slurry turns back to again the indissoluble state in appropriate amounts of ammonia, hydrochloric acid is neutralized into ammonium chloride fertilizer by ammonia simultaneously.Different according to the acid-basicity of fertilising soil, make the coating slurry be suitable for different edaphic condition, can be degradable in edatope, the secondary pollution that can not produce environment.In preparation process of the present invention, without waste water, waste gas, solid waste " three wastes " discharging, technique is simple, is suitable for large-scale commercial production.
The 3rd purpose of the present invention is, proposes two kinds of using method of coating slurry:
The one,, in ammonia atmosphere, particulate state fertilizer is immersed in the coating slurry, make the coating slurry in particulate state fertilizer surface formation wrap film; Then dry solidification in the dry ammonia atmosphere, make the coating biological controlled-released fertilizer.
The 2nd,, in ammonia atmosphere, the coating slurry is sprayed at granular fertilizer surperficial, make the coating slurry in particulate state fertilizer surface formation wrap film; Then dry solidification in the dry ammonia atmosphere, make the coating biological controlled-released fertilizer.
The using method of above two kinds of coatings slurry all can be produced the release and release control fertilizer of coating slurry, and its technology highly versatile is prepared into the production of biotype release and release control fertilizer applicable to mineral manure (as urea, bicarbonate of ammonia etc.) or compound manure.Also can regulate biological controlled-released wrap film and form according to using object and requirement, but the slowly-releasing of Controlled release fertilizers and control efficient.
Embodiment
Example one:
1, the 5kg paddy stalk is pulverized, be placed in 9kg water and soak after 2 days, 30
oStir pulping under the C condition.After standing, the conduct of upper strata waste water complete-reclaiming is the process water of straw pulping next time.Obtain the straw underflow of lower floor.
2, the high chitosan of 1.6kg being dissolved in the 1.0kg, the mass concentration that have prepared is in 6% technical hydrochloric acid, makes high chitosan slurry.
3, the straw underflow is mixed, stirred with high chitosan slurry, make straw and chitosan controlled release coating slurry.
The 50kg that 4, will make, diameter are about the urea granules of 1～10mm, are immersed in this controlled release wrap film slurry.
The fertiliser granulates that 5, will have been wrapped up by release-controlled film, dry in dry ammonia, curing make with biological controlled-released urea fertilizer.
6, detect:
In this fertilizer, the quality of paddy stalk accounts for 8.3 %; The quality of high chitosan accounts for 2.6 %; The quality of urea accounts for 79.1%; The quality of ammonia accounts for 2.5%; The quality of hydrochloric acid accounts for 0.1 %; The quality of water accounts for 7.4%.
The slowly-releasing transformation period of this fertilizer in water is 12.5 days.
Example two,
1,5kg wheat straw bar is pulverized, be placed in 9kg water and soak after 2 days, 50
oStir pulping under the C condition.After standing, the conduct of upper strata waste water complete-reclaiming is the process water of straw pulping next time.Lower floor is the straw underflow.
2, the high chitosan of 1.6kg is dissolved in the 1.0kg that prepared, 6% technical hydrochloric acid, makes high chitosan slurry.
3, the straw underflow is mixed, stirred with high chitosan slurry, make straw/chitosan controlled release coating slurry.
The 50kg that 4, will make, diameter are about the urea granules of 1～10mm, are immersed in this controlled release wrap film slurry.
5, fertiliser granulates drying, the curing in dry ammonia that will have been wrapped up by release-controlled film make with biological controlled-released urea fertilizer.
6, detect:
In this fertilizer, the quality of paddy stalk accounts for 8.2%; The quality of high chitosan accounts for 2.6%; The quality of urea accounts for 79.5%; The quality of ammonia accounts for 2.5%; The quality of hydrochloric acid accounts for 0.1%; The quality of water accounts for 7.1%.
The slowly-releasing transformation period of this fertilizer in water is 15 days.
Example three,
1, the 5kg paddy stalk is pulverized, be placed in 9kg water and soak after 2 days, 30
oStir pulping under the C condition.After standing, the conduct of upper strata waste water complete-reclaiming is the process water of straw pulping next time.Lower floor is the straw underflow.
2, the high chitosan of 1.6kg is dissolved in the 1.0kg that prepared, 6% technical hydrochloric acid, makes high chitosan slurry.
3, the straw underflow is mixed, stirred with high chitosan slurry, make controlled release coating slurry.
4, controlled release coating slurry is sprayed at the 50kg that has made, the urea granules surface that diameter is about 1～10mm.
5, dry in dry ammonia, curing, make with biological controlled-released urea fertilizer.
6, detect:
In this fertilizer, the quality of paddy stalk accounts for 8.3 %; The quality of high chitosan accounts for 2.6 %; The quality of urea accounts for 79.5 %; The quality of ammonia accounts for 3.0 %; The quality of hydrochloric acid accounts for 0.05 %; The quality of water accounts for 6.5 %.
The slowly-releasing transformation period of this fertilizer in water is 22 days.
Example four,
1,5kg wheat straw bar is pulverized, be placed in 9kg water and soak after 2 days, stir pulping under the 50oC condition.After standing, the conduct of upper strata waste water complete-reclaiming is the process water of straw pulping next time.Lower floor is the straw underflow.
2, the high chitosan of 1.8kg is dissolved in the 1.0kg that prepared, 6% technical hydrochloric acid, makes high chitosan slurry.
3, the straw underflow is mixed, stirred with high chitosan slurry, make controlled release coating slurry.
4, controlled release coating slurry is sprayed at the 50kg that has made, the bicarbonate of ammonia particle surface that diameter is about 1～10mm.
5, dry in dry ammonia, curing, make with biological controlled-released ammonium bicarbonate fertilizer.
6, detect:
In this fertilizer, the quality of paddy stalk accounts for 8.1%; The quality of high chitosan accounts for 2.9%; The quality of bicarbonate of ammonia accounts for 79.6%; The quality of ammonia accounts for 2.9%; The quality of hydrochloric acid accounts for 0.05%; The quality of water accounts for 6.5 %.
The slowly-releasing transformation period of this fertilizer in water is 32 days.
Example five,
1,6.5kg wheat straw bar is pulverized, be placed in 9kg water and soak after 2 days, stir pulping under the 50oC condition.After standing, the conduct of upper strata waste water complete-reclaiming is the process water of straw pulping next time.Lower floor is the straw underflow.
2, the high chitosan of 1.6kg is dissolved in the 1.0kg that prepared, 6% technical hydrochloric acid, makes high chitosan slurry.
3, the straw underflow is mixed, stirred with high chitosan slurry, make controlled release coating slurry.
4, controlled release coating slurry is sprayed at the 50kg that has made, the compound fertilizer granule surface that diameter is about 1～10mm.
5, dry in dry ammonia, curing, make with biological controlled-released compound manure.
6, detect:
In this fertilizer, the quality of paddy stalk accounts for 9.9 %; The quality of high chitosan accounts for 2.6 %; The quality of bicarbonate of ammonia accounts for 79.3%; The quality of ammonia accounts for 2.8%; The quality of hydrochloric acid accounts for 0.05%; The quality of water accounts for 5.0 %.
The slowly-releasing transformation period of this fertilizer in water is 16.3 days.
Claims (1)
1. the coating of release and release control fertilizer slurry, made by paddy stalk or wheat straw bar, high chitosan and hydrochloric acid, and the mass ratio that it is characterized in that described paddy stalk or wheat straw bar, high chitosan and hydrochloric acid is 5～15:2～5:0.1～3; Paddy stalk or wheat straw bar are made the straw underflow; Dilute hydrochloric acid is mixed with high chitosan, stir into high chitosan slurry under 30～50 ℃ of conditions; Again the straw underflow is mixed with high chitosan slurry, make the coating slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110070326 CN102180739B (en) | 2011-03-23 | 2011-03-23 | Coating pulp for controlled release fertilizer and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110070326 CN102180739B (en) | 2011-03-23 | 2011-03-23 | Coating pulp for controlled release fertilizer and production method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN102180739A CN102180739A (en) | 2011-09-14 |
| CN102180739B true CN102180739B (en) | 2013-11-06 |
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| CN 201110070326 Expired - Fee Related CN102180739B (en) | 2011-03-23 | 2011-03-23 | Coating pulp for controlled release fertilizer and production method thereof |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102795924B (en) * | 2012-07-26 | 2013-12-04 | 山东农业大学 | Coated controlled-release fertilizer using crop straws as degradable film and production method of fertilizer |
| CN111296228A (en) * | 2020-04-20 | 2020-06-19 | 黑龙江大学 | Method for preparing slow-release culture soil based on garbage soil |
| PL441708A1 (en) * | 2022-07-12 | 2024-01-15 | Grupa Azoty Zakłady Azotowe Kędzierzyn Spółka Akcyjna | Method of obtaining coacervates based on chitosan derivatives and use of coacervates based on chitosan derivatives |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1181875A (en) * | 1997-11-06 | 1998-05-20 | 陈广田 | Coating for pesticide and fertilizer and its preparation |
| CN1470485A (en) * | 2002-07-23 | 2004-01-28 | 中国科学院南京土壤研究所 | Carrier type slow-release fertilizer and its preparing method |
| CN101229985A (en) * | 2007-01-22 | 2008-07-30 | 烟台昊峰有机肥料有限公司 | Chitosan coated controlled release fertilizers and preparation method thereof |
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2011
- 2011-03-23 CN CN 201110070326 patent/CN102180739B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1181875A (en) * | 1997-11-06 | 1998-05-20 | 陈广田 | Coating for pesticide and fertilizer and its preparation |
| CN1470485A (en) * | 2002-07-23 | 2004-01-28 | 中国科学院南京土壤研究所 | Carrier type slow-release fertilizer and its preparing method |
| CN101229985A (en) * | 2007-01-22 | 2008-07-30 | 烟台昊峰有机肥料有限公司 | Chitosan coated controlled release fertilizers and preparation method thereof |
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| CN102180739A (en) | 2011-09-14 |
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