CN104649826A - Method for preparing anti-caking slow-release fertilizer from magnesium slag - Google Patents
Method for preparing anti-caking slow-release fertilizer from magnesium slag Download PDFInfo
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- CN104649826A CN104649826A CN201510066412.XA CN201510066412A CN104649826A CN 104649826 A CN104649826 A CN 104649826A CN 201510066412 A CN201510066412 A CN 201510066412A CN 104649826 A CN104649826 A CN 104649826A
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- fertilizer
- magnesium slag
- caking
- magnesium
- slag
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
-
- 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
- C05G1/00—Mixtures of fertilisers belonging individually to different subclasses of C05
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- Pest Control & Pesticides (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Fertilizers (AREA)
Abstract
The invention discloses a method for preparing an anti-caking slow-release fertilizer from magnesium slag, belonging to the technical fields of utilization of magnesium slag and preparation of compound fertilizers. The method comprises the following steps: a. adding a granular compound fertilizer into a coating machine, and preheating; b. spraying an organic adhesive; c. spreading magnesium slag powder to form a compact coating layer; d. repeating the steps b and c until all the organic adhesive is soaked in the coating layer, wherein the constant-temperature heating state is kept in the whole process; and e. taking out the product, and standing for some time for curing, thereby obtaining the product, wherein the mass ratio of the granular compound fertilizer, organic adhesive and magnesium slag powder is 20:(2-4):(2-5), and the organic adhesive is prepared from urea, corn starch and polyvinyl alcohol. The method utilizes the industrial solid waste magnesium slag, and the prepared fertilizer has favorable anti-caking property and slow-release property.
Description
Technical field
The present invention relates to compound manure preparation, specifically belong to and utilize magnesium slag to prepare the method with anti-caking and sustained release performance fertilizer.
Background technology
Fertilizer caking is the problem that chemical fertilizer industry is devoted to solve for a long time, and nitrogen content is higher, more easily lumps.For manufacturer, fertilizer is not easily stored for a long time, transport, and large batch of caking fertiliser finds no market, thus cause resource flow to stagnation and economic loss; For user, be not easy to mechanized application because caking causes; Moreover, if character there occurs change, after using, may fertilizer efficiency be reduced, even may produce harm to farm crop.Whether the caking of chemical fertilizer has become the index weighing chemical fertilizer products quality.
Common fertilizer is dissolved in soil, and rate of release is very fast, has the fertilizer loss of quite a few to fall, and makes the pollution that environment is subject in various degree.Slow release fertilizer can slow releasing nutrient, makes its nutrients release and plant absorption reach consistent, and then improves the utilising efficiency of fertilizer.Along with China's expanding economy, application and the market outlook of slow release fertilizer can be more and more wide.
The main moiety of magnesium slag (Pidgeon process smelts the magnesium slag produced in magnesium process) is CaO, SiO
2,mgO etc.These elements are all the necessary nutritive elements of plant, and wherein element silicon has been proved to be the fourth-largest plant nutrient after N, P, K.Farm crop can promote growing of plant after absorbing silicon, improve photosynthesis, improve crops quality.The experimental data in early stage shows simultaneously, and the heavy metal content in magnesium slag, all lower than the relevant limit value (table 1) of water-soluble fertilizer standard NY 1110-2006, provides possibility with regard to carrying out agricultural resources utilization for magnesium slag like this.
Table 1 fertilizer product heavy metal index contrast table
Utilize coating mode to prepare slow-release fertilizer to be widely used.Such as Chinese patent (publication number: CN 102276353 A) relate to utilize trade waste Phosphorus Slag produce slow-release compound fertilizer, utilize molasses as coating auxiliary; And adopt drum-type coating machine.Chinese patent (publication number: CN 103012019 A) relates to a kind of Urea slow release membrane material and preparation method thereof, selects cement, encapsulant-whiteruss, solidifying agent-Dyhard RU 100, vegetables oil-Viscotrol C to be starting material; Starting material cost comparatively of the present invention is higher, and Dyhard RU 100 pollutes soil, and not easily degrades; And not mentioned coating is on the impact of fertilizer agglomeration preventing performance in this invention; Chinese patent (patent No. ZL 200510104226.7) a kind of coated slow releasing fertilizer and preparation method thereof, is raw materials usedly commercially available pharmaceutical chemicals, and cost is higher.
Summary of the invention
In order to solve deficiency existing in prior art, a kind of trade waste magnesium slag that utilizes is provided to produce the method with anti-caking and sustained release performance fertilizer.
The technical solution used in the present invention is:
Utilize magnesium slag to prepare the method with anti-caking and sustained release performance fertilizer, carry out according to following steps:
A, granular compound fertilizer is added seed-coating machine preheating;
B, to spray with organic binder bond;
C, spread fertilizer over the fields magnesium ground-slag end, form one deck integument closely;
D, repeating step b and c2-3 time, until organic binder bond all infiltrates in integument; Whole process keeps heated condition;
After e, Step d complete, take out product, place for some time solidification, obtain this product.
The granular compound fertilizer crossing 4-6 mesh sieve of described granular compound fertilizer to be main component be N, P, K.
The mass ratio at described granular compound fertilizer, organic binder bond, magnesium ground-slag end is 20:2-4:2-5.
Described organic binder bond is polyvinyl alcohol water solution 1: 1 preparation by volume by the W-Gum aqueous solution of 10-40g/L and 40g/L, and forms with the urea-modified of binding agent total amount 1.2%.
The magnesium slag that described magnesium ground-slag end is natural condition cooling.
Described magnesium slag particle size after cracking is more than 20 orders.
Described seed-coating machine rotating speed is that per minute 40-60 turns.
Described Heating temperature is 50-80 DEG C.
The beneficial effect that the present invention is compared with prior art had is:
Utilize industrial solid castoff magnesium slag to prepare film-coated and slow release fertilizer, not only composite fertilizer's nutrient obtains slowly-releasing, additionally provides the nutritive elements such as silicon, calcium, magnesium, and useful crop plants grows; Fertilizer ultimate compression strength after magnesium cinder ladle film improves 50%, and effectively improves the anti-caking rate of fertilizer; With modified corn starch and polyvinyl alcohol for binding agent, magnesium slag is that fertilizer coating is carried out in coating agent, and raw materials used environment-friendly degradable is pollution-free to soil, opens the new way that industrial solid castoff magnesium slag is recycled.
Compared with other polymer integument type slow release fertilizer, the advantage of lower cost of the enveloped slow release fertilizer being coated fertilizer with magnesium slag, the roasting under 1200 DEG C of conditions of magnesium slag, therefore has good chemical stability and thermostability simultaneously; Magnesium slag as a kind of silicate minerals, the NH in Si-O key wherein and fertilizer
4 +, PO
4 3-form chemisorption, thus make the N/P in fertilizer have longer release period; Coated fertilizer cost of the present invention is low, and easily degrades in soil, and technological process is simple, thus has good promotional value.
Embodiment
Below by embodiment, the present invention is described in further detail.
In following examples, organic binder bond is prepared as follows: in 100ml beaker, takes 0.5-2g soluble corn starch, adds 50ml distilled water, drips 5 glycerine, is placed in 60 DEG C of thermostat water bath heated and stirred, until starch dissolves completely; Separately get with a beaker, take 2g polyvinyl alcohol, add 50ml distilled water, be placed in 70 DEG C of thermostat water bath heated and stirred and make it dissolve completely; Polyvinyl alcohol solution is poured into 80 DEG C of heated and stirred in starch solution, adds 1 propyl carbinol defoamer, then add 1.2% urea-modified, continuous heating stir 3h.
Embodiment 1
Granular compound fertilizer (composite fertilizer that the Stanley Co., Ltd produces) 20g be sieving through is added in the BY300A type seed-coating machine of uniform rotation, spray organic binder bond (10g/L W-Gum+40g/L polyvinyl alcohol, 1.2% urea carries out modification), fertilizer surface is made to form one deck binding liquid, spread fertilizer over the fields the magnesium ground-slag end of 20 mesh sieves, revolution is per minute 40 turns, rotates a moment, makes fertilizer surface form one deck integument closely.Spray has agent binding agent again, spreads fertilizer over the fields magnesium slag, and use constent temperature heater to keep thermostatically heating state in whole process, Heating temperature is 50 °, repeats said process 2 times (binding agent parcel amount is 2g, and the magnesium cinder ladle amount of wrapping up in is 2.1g).The complete rear taking-up product of coating places solidification in 10 minutes, obtains magnesium slag film-coated and slow release fertilizer sample, keeps particle sufficient movement in whole technological process, in case an interparticle bonding.Fertilizer coating rate after coating is 16.67%, and membrane wrapping thickness is 0.2mm, and initial stage release rate is 36%, 28d release rate is 85%, without luming and having certain sustained release performance.
Embodiment 2
Granular compound fertilizer (nitro-compound fertilizer that the fertile industry of the rich happiness is produced) 20g be sieving through is added in the BY300A type seed-coating machine of uniform rotation, spray a part of organic binder bond (20g/L W-Gum+40g/L polyvinyl alcohol, 1.2% urea carries out modification), fertilizer surface is made to form one deck binding liquid, spread fertilizer over the fields the magnesium ground-slag end of 180 mesh sieves, revolution is per minute 50 turns, rotates a moment, makes fertilizer surface form one deck integument closely.Spray has agent binding agent again, and spread fertilizer over the fields magnesium slag, keep thermostatically heating state in whole process, Heating temperature is 60 °, repeats said process 3 times (binding agent parcel amount is 2.2g, and the magnesium cinder ladle amount of wrapping up in is 5g).The complete rear taking-up product of coating places solidification in 10 minutes, obtains magnesium slag film-coated and slow release fertilizer sample.Particle sufficient movement is kept, in case an interparticle bonding in whole technological process.Fertilizer coating rate after coating is 26.47%, and membrane wrapping thickness is 0.3mm, and initial stage release rate is 30%, 28d release rate is 81%, without luming and having certain sustained release performance.
Embodiment 3
Granular compound fertilizer (composite fertilizer that the Stanley Co., Ltd produces) 20g be sieving through is added in the BY300A type seed-coating machine of uniform rotation, spray a part of organic binder bond (30g/L W-Gum+40g/L polyvinyl alcohol, 1.2% urea carries out modification), fertilizer surface is made to form one deck binding liquid, spread fertilizer over the fields the magnesium ground-slag end of 300 mesh sieves, revolution is per minute 60 turns, rotates a moment, makes fertilizer surface form one deck integument closely.Spray has agent binding agent again, and spread fertilizer over the fields magnesium slag, keep thermostatically heating state in whole process, Heating temperature is 70 °, repeats said process 2 times (binding agent parcel amount is 2.5g and the magnesium cinder ladle amount of wrapping up in is 3.9g).The complete rear taking-up product of coating places solidification in 10 minutes, obtains magnesium slag film-coated and slow release fertilizer sample.Particle sufficient movement is kept, in case an interparticle bonding in whole technological process.Fertilizer coating rate after coating is 24.24%, and membrane wrapping thickness is 0.26mm, and initial stage release rate is 25%, 28d release rate is 75%, without luming and having certain sustained release performance.
Embodiment 4
Granular compound fertilizer (nitro-compound fertilizer that the fertile industry of the rich happiness is produced) 20g be sieving through is added in the BY300A type seed-coating machine of uniform rotation, spray a part of organic binder bond (40g/L W-Gum+40g/L polyvinyl alcohol, 1.2% urea carries out modification), fertilizer surface is made to form one deck binding liquid, spread fertilizer over the fields the magnesium ground-slag end of 300 mesh sieves, revolution is per minute 60 turns, rotates a moment, makes fertilizer surface form one deck integument closely.Spray has agent binding agent again, and spread fertilizer over the fields magnesium slag, keep thermostatically heating state in whole process, Heating temperature is 80 °, repeats said process 3 times (binding agent parcel amount is 4g, the magnesium cinder ladle amount of wrapping up in 3.6g).The complete rear taking-up product of coating places solidification in 10 minutes, obtains magnesium slag film-coated and slow release fertilizer sample.Particle sufficient movement is kept, in case an interparticle bonding in whole technological process.Fertilizer coating rate after coating is 27.53%, and membrane wrapping thickness is 0.4mm, and initial stage release rate is 20%, 28d release rate is 75%, without luming and having certain sustained release performance.
The present invention is applicable to the coating process of all fertilizer, and the fertilizer after coating has anti-caking and certain slow release effect concurrently.
Coating rate: coating rate=(M1-M0)/M1 × 100%, wherein: the quality (g) of fertilizer after M1=coating, the quality (g) of fertilizer before M0=coating.Coating rate intuitively can reflect the parcel amount of coated fertilizer.
Claims (7)
1. utilize magnesium slag to prepare the method with anti-caking and sustained release performance fertilizer, it is characterized in that, carry out according to following steps:
A, granular compound fertilizer is added seed-coating machine;
B, to spray with organic binder bond;
C, spread fertilizer over the fields magnesium ground-slag end, form one deck integument closely;
D, repeating step b and c 2-3 time, until organic binder bond all infiltrates in integument, whole process keeps heated condition;
After e, Step d complete, take out product, open wide and place for some time solidification, obtain this product.
2. according to claim 1ly utilize magnesium slag to prepare to there is the method for anti-caking and sustained release performance fertilizer, it is characterized in that: the granular compound fertilizer crossing 4-6 mesh sieve of described coated fertilizer to be main component be N, P, K.
3. the magnesium slag that utilizes according to claim 1 prepares the method with anti-caking and sustained release performance fertilizer, it is characterized in that: described organic binder bond is polyvinyl alcohol water solution 1: 1 preparation by volume by the W-Gum aqueous solution of 10-40g/L and 40g/L, and forms with the urea-modified of binding agent total amount 1.2%.
4. the magnesium slag that utilizes according to claim 1 prepares the method with anti-caking and sustained release performance fertilizer, it is characterized in that: described magnesium slag particle degree is more than 20 orders.
5. the magnesium slag that utilizes according to claim 1 prepares the method with anti-caking and sustained release performance fertilizer, it is characterized in that: the mass ratio at described granular compound fertilizer, organic binder bond, magnesium ground-slag end is 20:2-4:2-5.
6. the magnesium slag that utilizes according to claim 1 prepares the method with anti-caking and sustained release performance fertilizer, it is characterized in that: described seed-coating machine rotating speed is that per minute 40-60 turns.
7. the magnesium slag that utilizes according to claim 1 prepares the method with anti-caking and sustained release performance fertilizer, it is characterized in that: described Heating temperature is 50-80 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510066412.XA CN104649826A (en) | 2015-02-09 | 2015-02-09 | Method for preparing anti-caking slow-release fertilizer from magnesium slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510066412.XA CN104649826A (en) | 2015-02-09 | 2015-02-09 | Method for preparing anti-caking slow-release fertilizer from magnesium slag |
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| CN104649826A true CN104649826A (en) | 2015-05-27 |
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| CN201510066412.XA Pending CN104649826A (en) | 2015-02-09 | 2015-02-09 | Method for preparing anti-caking slow-release fertilizer from magnesium slag |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105950167A (en) * | 2016-05-13 | 2016-09-21 | 宁夏大荣化工冶金有限公司 | Acid soil conditioner and method for promoting production increase and quality improvement through application of acid soil conditioner to actinidia |
| CN107586189A (en) * | 2017-07-18 | 2018-01-16 | 湖北富邦科技股份有限公司 | A kind of preparation method of the special damp-proof urea of Blending Fertilizer |
| CN113582754A (en) * | 2021-07-20 | 2021-11-02 | 烟台市烟农富邦肥料科技有限公司 | Slow-release potassium fertilizer and preparation method thereof |
| CN114149293A (en) * | 2021-12-22 | 2022-03-08 | 湖北富邦新材料有限公司 | Water-soluble ammonium phosphate fertilizer coating agent and preparation method thereof |
| CN116396120A (en) * | 2023-04-19 | 2023-07-07 | 新洋丰农业科技股份有限公司 | Fertilizer for improving quality of citrus fruits and preparation method thereof |
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| US20080072641A1 (en) * | 2006-08-24 | 2008-03-27 | Arr-Maz Custom Chemicals, Inc. | Dust control of solid granular materials |
| CN101445400A (en) * | 2007-11-26 | 2009-06-03 | 南京理工大学 | Surface treatment method for antiknocking and modifying granulated fertilizer containing ammonium nitrate |
| CN101921149A (en) * | 2010-08-24 | 2010-12-22 | 中盐安徽红四方股份有限公司 | Filler-free synergistic compound fertilizer produced by urine syrup ammonia-acid method and production method thereof |
| CN102020517A (en) * | 2010-08-25 | 2011-04-20 | 国际竹藤网络中心 | Slow release fertilizer and preparation method thereof |
-
2015
- 2015-02-09 CN CN201510066412.XA patent/CN104649826A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080072641A1 (en) * | 2006-08-24 | 2008-03-27 | Arr-Maz Custom Chemicals, Inc. | Dust control of solid granular materials |
| CN101445400A (en) * | 2007-11-26 | 2009-06-03 | 南京理工大学 | Surface treatment method for antiknocking and modifying granulated fertilizer containing ammonium nitrate |
| CN101921149A (en) * | 2010-08-24 | 2010-12-22 | 中盐安徽红四方股份有限公司 | Filler-free synergistic compound fertilizer produced by urine syrup ammonia-acid method and production method thereof |
| CN102020517A (en) * | 2010-08-25 | 2011-04-20 | 国际竹藤网络中心 | Slow release fertilizer and preparation method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105950167A (en) * | 2016-05-13 | 2016-09-21 | 宁夏大荣化工冶金有限公司 | Acid soil conditioner and method for promoting production increase and quality improvement through application of acid soil conditioner to actinidia |
| CN107586189A (en) * | 2017-07-18 | 2018-01-16 | 湖北富邦科技股份有限公司 | A kind of preparation method of the special damp-proof urea of Blending Fertilizer |
| CN113582754A (en) * | 2021-07-20 | 2021-11-02 | 烟台市烟农富邦肥料科技有限公司 | Slow-release potassium fertilizer and preparation method thereof |
| CN114149293A (en) * | 2021-12-22 | 2022-03-08 | 湖北富邦新材料有限公司 | Water-soluble ammonium phosphate fertilizer coating agent and preparation method thereof |
| CN116396120A (en) * | 2023-04-19 | 2023-07-07 | 新洋丰农业科技股份有限公司 | Fertilizer for improving quality of citrus fruits and preparation method thereof |
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Application publication date: 20150527 |