CN1331817C - Method for producing agricultural granular magnesium sulfate fertilizer - Google Patents
Method for producing agricultural granular magnesium sulfate fertilizer Download PDFInfo
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- CN1331817C CN1331817C CNB031420915A CN03142091A CN1331817C CN 1331817 C CN1331817 C CN 1331817C CN B031420915 A CNB031420915 A CN B031420915A CN 03142091 A CN03142091 A CN 03142091A CN 1331817 C CN1331817 C CN 1331817C
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- sulfate fertilizer
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Abstract
The present invention discloses a method for producing agricultural granular magnesium sulfate fertilizer, which comprises the following technical steps: sulfuric acid, magnesium oxide mineral powder and water are added into a mixer to be thoroughly mixed to be prepared into diluent slurry with a bigger liquid phase; the diluent slurry is transferred into a horizontal biaxial granulating machine to be formed into thin granules containing certain moisture; then the granules are transferred to a belt forming machine, the materials are accumulated and definite bed thickness is kept. The secondary intense chemical reaction of the material is carried out in the static state, then the material temperature ascends once more, and then a large amount of moisture escapes once more in the form of steam; the material is sent to a cooling machine to be cooled to make partial free water turned into crystal water; finally, a grainy agricultural magnesium sulfate fertilizer finished product is manufactured by shaping and sieving. The whole manufacturing process is continuously carried out. The present invention not only has simple and convenient technique and low production cost. Moreover, applying the grainy magnesium sulfate fertilizer can be very convenient. The grainy magnesium sulfate fertilizer is not easy to run off and can not pollute the environment.
Description
Technical field the present invention relates to a kind of production method of agricultural magnesium sulfate fertilizer.
The background technology magnesium sulfate fertilizer is the essential middle trace elements fertilizer of farm crop, supply in the market mostly be powdery, crystalloid magnesium sulfate fertilizer, can not shed on a large scale when using, very inconvenient; The application neutralization is used the back and is floated aloft easily, and air is polluted; Using back fertilizer also runs off easily.The particulate state magnesium sulfate fertilizer that forms through secondary processing is also arranged, but its manufacture craft is comparatively complicated, cost of manufacture is higher.
Summary of the invention technical problem to be solved by this invention is to propose a kind of production method that can directly make granular magnesium sulfate fertilizer, and this method production technique is simple, and cost of manufacture is low.
For solving the problems of the technologies described above, the production method of granular agricultural magnesium sulfate fertilizer of the present invention comprises following processing step: 1, sulfuric acid, magnesium oxide breeze and water are added in the mixing tank, carry out thorough mixing, the solvent or diluent slurry that the furnishing liquid phase is bigger, the temperature range of solvent or diluent slurry is between 130-145 ℃; 2, the solvent or diluent slurry is changed in the horizontal-type biaxial tablets press; in the kneading process of each rotating propeller blade; free moisture content is that the liquid phase composition reduces gradually; material changes into viscous slurry by the solvent or diluent slurry; change into the free less wet stock of moisture content again, under the rotating propeller blade effect of different angles, form the tiny particulate material that contains certain moisture content then.At this moment, temperature of charge is between 60-80 ℃; 3 and then change granule materials over to belt and change in the machine, with solid accumulation and keep certain bed thickness, keep that material stops, soaking time 30-45 minute.At this moment, material carries out the violent chemical reaction of secondary in static state, and temperature of charge rises to 100-130 ℃ once more, and a large amount of moisture content in the thermal material are overflowed once more with the form of water vapour; 4, material is sent into the cooler internal cooling, temperature of charge is cooled to below 80 ℃, the part free-water is transformed into crystal water.This moment, material changed into the solid particulate stable, that certain intensity is arranged; 5, through shaping, screening, make granular agricultural magnesium sulfate fertilizer finished product; Coarse fodder after the screening and fines return and carry out cyclic production in the mixing tank after handling; Whole process of production is carried out continuously.
The production method of above-mentioned granular agricultural magnesium sulfate fertilizer, described vitriolic concentration is 60%-98%, the content of MgO is more than 70% in the described magnesium oxide breeze, and the weight ratio of described sulfuric acid, magnesium oxide breeze and water is 1.00-0.60: 0.40-0.30: 0.01-0.60 during mixing.
The production method of above-mentioned granular agricultural magnesium sulfate fertilizer, granule materials remain between the 0.2-0.5 rice changing the bed thickness that belt changes in the machine over to.
The production method of above-mentioned granular agricultural magnesium sulfate fertilizer, the particle diameter of granular magnesium sulfate fertilizer is controlled at 1-4.75mm during screening.
Why the present invention adopts aforementioned production method, be because the contriver discovers in the production process of magnesium sulfate fertilizer, the sal epsom slip has following peculiar mechanism in reaction process: can produce a large amount of heats during slurry reaction, moisture content is because of temperature height, the big evaporation rapidly of heat; Slip is being mediated under the stirring action, dynamically in its reaction slow down, temperature descends; When temperature of charge was lower than 150 ℃, free moisture content changed to crystal water, and the material liquid phase reduces; Material after the kneading is when static state is incubated, and secondary reaction continues aggravation, and temperature rises again, and the moisture content in the material evaporates once more.The present invention has made full use of above-mentioned peculiar mechanism, adopted above production technique, utilize the raw materials for production of agricultural magnesium sulfate fertilizer directly to make the granular agricultural magnesium sulfate fertilizer, technology is simple and convenient, production cost is low, the granular magnesium sulfate fertilizer that makes is used conveniently, is difficult for running off, and also can not pollute environment.In the production process, granule materials bed thickness when changing belt over to and change in the machine remains between the 0.2-0.5 rice, heats up to guarantee the material secondary reaction.The particle diameter of granular magnesium sulfate fertilizer is controlled at 1-4.75mm during screening, can make the granular magnesium sulfate fertilizer that makes be suitable for most using.
Embodiment
Embodiment 1 produces 1 ton of granular magnesium sulfate fertilizer.400 kilograms of magnesium oxide breezes and the water 600 kilograms (in order to regulate the temperature and the concentration of slip) of getting 600 kilograms in 98% sulfuric acid, MgO content 70% add in the mixing tank, carry out thorough mixing, the solvent or diluent slurry that the furnishing liquid phase is bigger, the temperature range of solvent or diluent slurry is between 130-145 ℃.Solvent or diluent behind furnishing slurry is changed in the horizontal-type biaxial tablets press; in the kneading process of each rotating propeller blade; free moisture content is that liquid phase gradually reduces; material changes into viscous slurry by the solvent or diluent slurry; change into the free less wet stock of moisture content again; then form the tiny particulate material that contains certain moisture content under the rotating propeller blade effect of different angles, at this moment, temperature of charge is between 60-80 ℃.And then change granule materials over to belt and change in the machine, with solid accumulation and keep 0.3 meter bed thickness.At this moment, material carries out the violent chemical reaction of secondary in static state.Material stop, soaking time were remained on 30 minutes, and temperature of charge rises to 100-130 ℃ once more, and a large amount of moisture content in the thermal material are overflowed once more with the form of water vapour.Subsequently, material is sent into the cooler internal cooling, temperature of charge is cooled to below 80 ℃, the part free-water is transformed into crystal water, this moment material change into stable, have certain intensity (can 〉=6N) solid particulate.Pass through shaping, screening at last, make granular agricultural magnesium sulfate fertilizer finished product.The particle diameter of screening can be decided according to customer requirement, generally selects between 1-4.75mm.Coarse fodder after the screening and fines return and carry out cyclic production in the mixing tank after handling.
Embodiment 2 produces 1 ton of granular magnesium sulfate fertilizer.Get in 310 kilograms of the magnesium oxide breezes and 10 kilograms of adding mixing tanks of water of 1000 kilograms in 60% sulfuric acid, MgO content 90%, carry out thorough mixing, the solvent or diluent slurry that the furnishing liquid phase is bigger.Solvent or diluent behind furnishing slurry is changed in the horizontal-type biaxial tablets press; in the kneading process of each rotating propeller blade; free moisture content is that liquid phase gradually reduces; material changes into viscous slurry by the solvent or diluent slurry; change into the free less wet stock of moisture content again, under the rotating propeller blade effect of different angles, form the tiny particulate material that contains certain moisture content then.And then change granule materials over to belt and change in the machine, with solid accumulation and keep 0.5 meter bed thickness.At this moment, material carries out the violent chemical reaction of secondary in static state.Material stop, soaking time were remained on 40 minutes, and temperature of charge rises to 100-130 ℃ once more, and a large amount of moisture content in the thermal material are overflowed once more with the form of water vapour.Subsequently, material is sent into the cooler internal cooling, temperature of charge is cooled to below 80 ℃, the part free-water is transformed into crystal water, and this moment, material changed into the solid particulate stable, that certain intensity is arranged.Pass through shaping, screening at last, make granular agricultural magnesium sulfate fertilizer finished product.
Embodiment 3 produces 1 ton of granular magnesium sulfate fertilizer.Get in 330 kilograms of the magnesium oxide breezes and 500 kilograms of adding mixing tanks of water of 630 kilograms in 92.5% sulfuric acid, MgO content 85%, carry out thorough mixing, the solvent or diluent slurry that the furnishing liquid phase is bigger.Solvent or diluent behind furnishing slurry is changed in the horizontal-type biaxial tablets press; in the kneading process of each rotating propeller blade; free moisture content is that liquid phase gradually reduces; material changes into viscous slurry by the solvent or diluent slurry; change into the free less wet stock of moisture content again, under the rotating propeller blade effect of different angles, form the tiny particulate material that contains certain moisture content then.And then change granule materials over to belt and change in the machine, with solid accumulation and keep 0.4 meter bed thickness.At this moment, material carries out the violent chemical reaction of secondary in static state.Material stop, soaking time were remained on 35 minutes, and temperature of charge rises to 100-130 ℃ once more, and a large amount of moisture content in the thermal material are overflowed once more with the form of water vapour.Subsequently, material is sent into the cooler internal cooling, temperature of charge is cooled to below 80 ℃, the part free-water is transformed into crystal water, and this moment, material changed into the solid particulate stable, that certain intensity is arranged.Pass through shaping, screening at last, make granular agricultural magnesium sulfate fertilizer finished product.
The molecular formula of the magnesium sulfate fertilizer that the present invention makes is MgSO
4NH
2O (small amount of crystalline water), its index is in MgO, total effectively MgO content 〉=27%, water-soluble effective MgO content 〉=23%.
Claims (3)
1, the production method of granular agricultural magnesium sulfate fertilizer, it is characterized in that it comprises following processing step: 1, sulfuric acid, magnesium oxide breeze and water are added in the mixing tank, carry out thorough mixing, the solvent or diluent slurry that the furnishing liquid phase is bigger, the temperature range of solvent or diluent slurry is between 130-145 ℃; 2, the solvent or diluent slurry is changed in the horizontal-type biaxial tablets press, in the kneading process of each rotating propeller blade, free moisture content is that the liquid phase composition reduces gradually, material changes into viscous slurry by the solvent or diluent slurry, change into the free less wet stock of moisture content again, under the rotating propeller blade effect of different angles, form the tiny particulate material that contains certain moisture content then; The temperature of charge of this moment is between 60-80 ℃; 3 and then change granule materials over to belt and change in the machine, with solid accumulation and bed thickness is remained between the 0.2-0.5 rice, keep that material stops, soaking time 30-45 minute; At this moment, material carries out the violent chemical reaction of secondary in static state, and temperature of charge rises to 100-130 ℃ once more, and a large amount of moisture content in the thermal material are overflowed once more with the form of water vapour; 4, material is sent into the cooler internal cooling, temperature of charge is cooled to below 80 ℃, the part free-water is transformed into crystal water; This moment, material changed into the solid particulate stable, that certain intensity is arranged; 5, through shaping, screening, make granular agricultural magnesium sulfate fertilizer finished product; Coarse fodder after the screening and fines return and carry out cyclic production in the mixing tank after handling; Whole process of production is carried out continuously.
2, the production method of granular agricultural magnesium sulfate fertilizer as claimed in claim 1, it is characterized in that, described vitriolic concentration is 60%-98%, the content of MgO is more than 70% in the described magnesium oxide breeze, and the weight ratio of described sulfuric acid, magnesium oxide breeze and water is 1.00-0.60: 0.40-0.30: 0.01-0.60 during mixing.
3, the production method of granular agricultural magnesium sulfate fertilizer as claimed in claim 1 or 2 is characterized in that, the particle diameter of granular magnesium sulfate fertilizer is controlled at 1-4.75mm during screening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031420915A CN1331817C (en) | 2003-08-02 | 2003-08-02 | Method for producing agricultural granular magnesium sulfate fertilizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031420915A CN1331817C (en) | 2003-08-02 | 2003-08-02 | Method for producing agricultural granular magnesium sulfate fertilizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1580000A CN1580000A (en) | 2005-02-16 |
| CN1331817C true CN1331817C (en) | 2007-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031420915A Expired - Fee Related CN1331817C (en) | 2003-08-02 | 2003-08-02 | Method for producing agricultural granular magnesium sulfate fertilizer |
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| Country | Link |
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| CN (1) | CN1331817C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101214981B (en) * | 2007-12-29 | 2010-04-21 | 营口菱镁化工（集团）有限公司 | Method for producing monohydrate magnesium sulfate by using gyration chemical synthesis device |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101486596B (en) * | 2009-02-18 | 2010-10-20 | 唐春森 | Agricultural magnesium sulphate fertilizer and preparation thereof |
| CN101624299B (en) * | 2009-07-20 | 2011-12-21 | 唐春森 | Agricultural magnesium sulfate fertilizer, preparation method thereof and special mixing reactor thereof |
| CN102020490B (en) * | 2010-10-18 | 2013-03-27 | 营口菱镁化工（集团）有限公司 | Method for producing granular magnesium sulfate fertilizer |
| CN104446990A (en) * | 2014-11-25 | 2015-03-25 | 营口菱镁化工集团有限公司 | High-efficiency slow-release type granular magnesium sulfate and preparation method thereof |
| CN106348878A (en) * | 2016-08-30 | 2017-01-25 | 茂名市新东方微肥有限公司 | Magnesium sulfate fertilizer |
| CN106278660A (en) * | 2016-08-30 | 2017-01-04 | 茂名市新东方微肥有限公司 | A kind of magnesium sulfate chemical fertilizer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86105794A (en) * | 1986-07-25 | 1987-01-31 | 仝兆胜 | With magnesite is the method for raw material production kieserite |
| CN1220970A (en) * | 1998-11-13 | 1999-06-30 | 化学工业部连云港设计研究院 | Technology for producing magnesium sulfate in treatment of titanium white waste sulfuric acid |
| JP2000095587A (en) * | 1998-09-24 | 2000-04-04 | Onoda Chemical Industry Co Ltd | Granular magnesium sulfate fertilizer and its production |
| WO2001038258A1 (en) * | 1999-11-23 | 2001-05-31 | Norsk Hydro Asa | Fertiliser additive comprising magnesium and calcium sulphate and carbonate |
-
2003
- 2003-08-02 CN CNB031420915A patent/CN1331817C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86105794A (en) * | 1986-07-25 | 1987-01-31 | 仝兆胜 | With magnesite is the method for raw material production kieserite |
| JP2000095587A (en) * | 1998-09-24 | 2000-04-04 | Onoda Chemical Industry Co Ltd | Granular magnesium sulfate fertilizer and its production |
| CN1220970A (en) * | 1998-11-13 | 1999-06-30 | 化学工业部连云港设计研究院 | Technology for producing magnesium sulfate in treatment of titanium white waste sulfuric acid |
| WO2001038258A1 (en) * | 1999-11-23 | 2001-05-31 | Norsk Hydro Asa | Fertiliser additive comprising magnesium and calcium sulphate and carbonate |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101214981B (en) * | 2007-12-29 | 2010-04-21 | 营口菱镁化工（集团）有限公司 | Method for producing monohydrate magnesium sulfate by using gyration chemical synthesis device |
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| CN1580000A (en) | 2005-02-16 |
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