CN102020490B - Method for producing granular magnesium sulfate fertilizer - Google Patents
Method for producing granular magnesium sulfate fertilizer Download PDFInfo
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- CN102020490B CN102020490B CN 201010521932 CN201010521932A CN102020490B CN 102020490 B CN102020490 B CN 102020490B CN 201010521932 CN201010521932 CN 201010521932 CN 201010521932 A CN201010521932 A CN 201010521932A CN 102020490 B CN102020490 B CN 102020490B
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Abstract
The invention discloses a method for producing a granular magnesium sulfate fertilizer, and particularly relates to a manufacturing method in which pneumatic drying and air classification are adopted. The method comprises the following steps of: after industrial sulfuric acid and caustic-calcined magnesium oxide powder serving as raw materials are reacted, crushing the materials; drying the crushed materials, transporting the materials into a first-stage dryer by using air flow for pre-drying and second-stage drying; and transporting the dried materials into a third-stage air classifying device to perform air classification. The method is simple, and is easy to implement. By the method, the granular magnesium sulfate fertilizer can be produced directly. The granular fertilizer produced by the method has medium and uniform grain size, and the internal water content is greatly reduced after the granular fertilizer is dried by the air flow, so that the fertilizer is difficult to cake in storage. Due to the medium and uniform grain size, the fertilizer can be uniformly mixed with other fertilizers so as to prepare a mixed fertilizer, the compatibility is improved, and the fertility can be exerted to the maximum extent. Besides, as the granular fertilizer is directly produced by a one-step method, flying dust can be reduced, the working environment is protected, and the problems in the prior art for producing a magnesium sulfate fertilizer are solved.
Description
Technical field
What the present invention announced is a kind of production method of granular magnesium sulfate fertilizer, specifically adopts the method for secondary air flow drying and three grades of air classification manufacturing granular magnesium sulfate fertilizers.
Background technology
At present, sal epsom fertilizer is mainly magnesium sulfate monohydrate.Its production method is made the powdered fertilizer product take light calcined magnesia, sulfuric acid and water as raw material through neutralization reaction, cooling, pulverizing, or makes granulated fertilizer through granulation process on the powdery basis.Because the moisture massfraction of magnesium sulfate monohydrate was 10～30% (comprising free-water and crystal water), so no matter any following point that all exists of these two kinds of state products:, lump easily in storage process because moisture more such as powder-like product.It is inhomogeneous that several fertilizer are mixed, and reduced compatibleness.The magnesium oxide ratio can play hydrolytic action to ammonia-state nitrogen greatly again, has reduced again quality product.In addition, powder-like product produces dust pollution to Working environment aborning.Affect Working environment.Granular as powder-like product is made, the one, increased production process, improved enterprise's production cost, also because the fertilizer of granulation is because size ratio is larger, skewness in soil, thereby the performance of shadow fertility.
Summary of the invention
For the problems referred to above, the purpose of this invention is to provide a kind of method of direct production granular magnesium sulfate fertilizer, produce the variety of issue that product exists to solve existing method.
Technical scheme of the present invention is as follows:
One, composition weight ratio
Industrial sulphuric acid 5
Light-magnesite powder 2.2
Water 3.4
The massfraction of industrial sulphuric acid is 92.5%, and the massfraction of light-magnesite powder is 85～97%, and granularity is 0～0.125mm.
Two, neutralization reaction
Above-mentioned material is put in the stirring mixer in proportion, reacted while stirring.The stirring reaction time is 5～10 minutes.Temperature of reaction is up to 140～150 ℃.Along with reaction, a large amount of water vapor volatilization of generation is taken away a large amount of reaction heat thereupon reaction mass is cooled off gradually, and when reaction mass was down to 100 ℃ of left and right sides, material began to solidify, caking.Then caking materials is carried out break process, material is carried out drying treatment after broken, by air-flow transport material to carry out in the one-level moisture eliminator predrying.The drying temperature of one-level moisture eliminator is 200～400 ℃, and be 1～10 minute time of drying.Then pre-dried material is sent into the secondary drying device by transfer line and carry out air stream drying, drying temperature is 400～600 ℃, and be 1～10 minute time of drying, and dried material is admitted to three grades of airflow classification devices again.A material material more than primary cyclone bottom discharge mouth separation size 0.8mm.Material less than granularity 0.8 particle enters second-stage separator by the primary cyclone outlet, isolates the finished particle fertilizer of granularity 0.1～0.8mm from the second-stage separator outlet at bottom.Granularity enters into three-stage cyclone separator with air-flow again less than the material of 0.1mm, isolates granularity from separator bottom and enters sack cleaner less than the material of 0.1mm and the superfine-material discharge port by three grades of separator tops and reclaim.The inventive method is simple, and is easy to implement.Be to increase air stream drying and air classification operation on the basis of original production method, directly produce the particulate state fertiliser containing magnesium.The particulate state fertilizer that adopts present method to make, granularity is moderate, even, and after passing through air stream drying, the interior moisture content decrease makes its prevented from caking in storage.Evenly with other Production of manure mixed fertilizer the time, can keep mixing because granularity is moderate, increase compatibleness.Its fertility can access maximum performance.Be exactly that the single stage method direct production goes out granular product fertilizer in addition, so no matter when making mixed fertilizer in the production scene or with it, all alleviated dust from flying, protected operating environment.Solved the problem that existing method manufactures a product and exists.
The present invention is without accompanying drawing
Embodiment:
Take by weighing massfraction and be 92.5% industrial sulphuric acid 500kg, water 340kg, granularity is 0-0.12, massfraction is 85% light calcined magnesia powder 220kg.Above-mentioned material is put in the stirred reactor in proportion, and the reaction times is 10 minutes.Temperature of reaction is up to 150 ℃.Along with reaction, the volatilization of a large amount of water vapor of generation is taken away a large amount of reaction heat thereupon reaction mass is cooled off gradually, when reaction mass is down to 100 ℃ the time material begin to solidify, lump.Then caking materials is carried out break process, break process adopts the hammering pulverizer to carry out.After broken material is carried out drying treatment, drying treatment is to utilize pneumatic drier to carry out.The feed bin that at first material after the fragmentation is added Pneumatic drying device, by feeder with after the tail gas of secondary drying device mixes, by air-flow transport material to carry out in the one-level moisture eliminator predrying.The drying temperature of one-level moisture eliminator is 400 ℃, and be 10 minutes time of drying.Then pre-dried material is passed through device bottom discharge port, mix with the air-flow that blower is sent here, send into the secondary drying device by transfer line and carry out air stream drying, drying temperature is 500 ℃, be 10 minutes time of drying, dried material enters three grades of airflow classification devices by secondary drying device discharge port.Material is introduced under the fan airflow function and carries out air classification in the primary cyclone.Air-flow is made rotational flow in separator, the sedimentation of larger particles material, material outstanding swinging in separator that particle is little.A material material more than primary cyclone bottom discharge mouth separation size 0.8mm.Material less than granularity 0.8 particle enters second-stage separator by the primary cyclone outlet, isolates the finished particle fertilizer of granularity 0.1～0.8mm from the second-stage separator outlet at bottom.Granularity enters into three-stage cyclone separator with air-flow again less than the material of 0.1mm, isolates granularity less than the material of 0.1mm from the separator bottom; The discharge port of superfine-material by three grades of separator tops enters sack cleaner and reclaims.The granularity of flash trapping stage is returned broken process greater than the material of 0.8mm, and then enters primary cyclone and carry out classification.The isolated granularity of second-stage separator is finished particle fertilizer at the granule materials of 0.1～0.8mm.Three grades of isolated granularities of separator then are used for granulation less than 0.1mm or superfine powder.
Claims (1)
1. the production method of a granular magnesium sulfate fertilizer is characterized in that:
The massfraction of industrial sulphuric acid is 92.5%, and the massfraction of light-magnesite powder is 85～97%, and granularity is 0～0.125mm, neutralization reaction
Put in proportion above-mentioned material in the stirring mixer, react while stirring, reaction times is 5～10 minutes, then caking materials is carried out break process, after the fragmentation material is carried out drying treatment, the drying temperature of one-level moisture eliminator is 200～400 ℃, be 1～10 minute time of drying, secondary drying device drying temperature is 400～600 ℃, and be 1～10 minute time of drying, and dried material carries out three grades of air classifications again to be processed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010521932 CN102020490B (en) | 2010-10-18 | 2010-10-18 | Method for producing granular magnesium sulfate fertilizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010521932 CN102020490B (en) | 2010-10-18 | 2010-10-18 | Method for producing granular magnesium sulfate fertilizer |
Publications (2)
| Publication Number | Publication Date |
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| CN102020490A CN102020490A (en) | 2011-04-20 |
| CN102020490B true CN102020490B (en) | 2013-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010521932 Active CN102020490B (en) | 2010-10-18 | 2010-10-18 | Method for producing granular magnesium sulfate fertilizer |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104529564A (en) * | 2014-12-30 | 2015-04-22 | 营口菱镁化工集团有限公司 | Quick-acting granular magnesium sulfate fertilizer and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1580000A (en) * | 2003-08-02 | 2005-02-16 | 唐春森 | Method for producing agricultural granular magnesium sulfate fertilizer |
| CN1785914A (en) * | 2005-11-02 | 2006-06-14 | 大连爱思凯矿产有限公司 | Brucite granular fertilizer and its preparation method |
| CN1810728A (en) * | 2005-11-02 | 2006-08-02 | 大连爱思凯矿产有限公司 | Natural granular magnesium sulfate fertilizer and its prepn process |
| CN101214981A (en) * | 2007-12-29 | 2008-07-09 | 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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2010
- 2010-10-18 CN CN 201010521932 patent/CN102020490B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1580000A (en) * | 2003-08-02 | 2005-02-16 | 唐春森 | Method for producing agricultural granular magnesium sulfate fertilizer |
| CN1785914A (en) * | 2005-11-02 | 2006-06-14 | 大连爱思凯矿产有限公司 | Brucite granular fertilizer and its preparation method |
| CN1810728A (en) * | 2005-11-02 | 2006-08-02 | 大连爱思凯矿产有限公司 | Natural granular magnesium sulfate fertilizer and its prepn process |
| CN101214981A (en) * | 2007-12-29 | 2008-07-09 | 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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| CN102020490A (en) | 2011-04-20 |
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Owner name: YINGKOU MAGNESITE CHEMICAL INDUSTRY GROUP CO., LTD Free format text: FORMER NAME: YINGKOU MAGNESITE CHEMICAL IND(GROUP)CO., LTD. |
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Address after: 115100 economic development zone around the city of Liaoning, Dashiqiao Patentee after: YINGKOU MAGNESITE CHEMICAL IND GROUP CO., LTD. Address before: 115100 Dashiqiao City, Liaoning province south loop economic development MAGNESITE Building Patentee before: Yingkou Magnesite Chemical Ind (Group) Co., Ltd. |