CN102701832A - Production method of granular potassium sulfate slow-release fertilizer - Google Patents
Production method of granular potassium sulfate slow-release fertilizer Download PDFInfo
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- CN102701832A CN102701832A CN2012100844684A CN201210084468A CN102701832A CN 102701832 A CN102701832 A CN 102701832A CN 2012100844684 A CN2012100844684 A CN 2012100844684A CN 201210084468 A CN201210084468 A CN 201210084468A CN 102701832 A CN102701832 A CN 102701832A
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Abstract
The invention relates to a method for production of granular potassium sulfate slow-release fertilizer, belonging to the field of fertilizer manufacturing technology. The method comprises the steps of preparation of a coating agent and coating of granular potassium sulfate, and specifically comprises the steps of adding castor oil, diethylene glycol and glycerin to a high-temperature alcoholysis kettle, stirring and heating to 220-230 DEG C, then reacting for 1.2 hours while preserving the heat; after alcoholysis, decreasing the temperature and transferring the materials into an esterification kettle and adding glycerol rosin and phthalic anhydride; then adding dimethylbenzene for refluxing and raising the temperature to 210-220 DEG C; after the solid is melt, stirring and keeping the temperature at 210-220 DEG C for refluxing; when the acid value is less than 8 in esterification process, decreasing the temperature and transferring above materials into a diluting kettle; then stirring and filtering to obtain the coating agent after material discharge; after that, adding a certain amount of the granular potassium sulfate to a fluid bed coating machine; controlling the hot air temperature of the fluid bed coating machine to 65-90 DEG C and controlling the pressure at a spout; injecting a certain amount of the coating agent into the potassium sulfate granules at a certain flow rate for coating; cooling and screening after the coating, finally packaging the qualified granules to obtain the finished product.
Description
Technical field
The present invention relates to a kind of working method of granular potassium sulfate slow release fertilizer, belong to the fertilizer production technology field, being specifically related to the particulate state vitriolate of tartar is the method for raw material production particulate state vitriolate of tartar slow release fertilizer.
Background technology
Potassium is one of plant three big nutritive elements, and application of potash fertilizer not only has tangible effect of increasing production, and can improve the quality of farm crop, and improves the utilization ratio of nitrogenous fertilizer and phosphate fertilizer.
Potash fertilizer principal item has Repone K, vitriolate of tartar, sylvite, potassium magnesium salts, carnallitite, saltpetre, kiln ash potash fertilizer etc.Wherein Repone K and potassium product quantity account for more than 95% of potash fertilizer total quantity.About 396.7 ten thousand tons (folding contains K to China's potash fertilizer output in 2010
2 O 100%), according to statistics, the annual potash fertilizer demand of present stage China is about 562.3 ten thousand tons of K
2O.
Because vitriolate of tartar is a water soluble fertilizer, run off easily in the fertilising back.The potassium sulphate fertilizer utilization ratio is generally at 20-50%, and in the area of rainfall amount greater than 3000 millimeters, its utilization ratio is less than 20%, not only wastes resource and contaminate environment.The consumption of vitriolate of tartar is increasing gradually, and it is Nonrenewable resources.So the utilization ratio that improves vitriolate of tartar is very necessary.
The technology that potash fertilizer is increased operation rate mainly contains three kinds of approach.1. utilize slag to prepare slow-releasing potash fertilizer.Waste residue and salt of wormwood that iron and steel smelting produces are main raw material, add the required nutritive element of plant, with high temperature melting or sintering, process slow-releasing potash fertilizer through solidifying, cooling off.2. be raw material with potassium felspar sand, rhombspar, serpentine, coke, make slow releasing silicon potassium compound fertilizer through sintering, quenching, drying, grinding.The product potassium oxide content that this method is produced is low.3. granular potassium sulfate is carried out coating.To diameter 2～5 mm granules vitriolate of tartar, be that mould material carries out coating with resin and additive.Its release period is about 90 days.
Summary of the invention
The present invention seeks to the particulate state vitriolate of tartar is raw material; Granular potassium sulfate is joined in the fluidized-bed coating machine; Simultaneously a certain amount of novel coating agent for preparing is joined by certain flow and carry out coating in the fluidized-bed; The consumption of coating agent is 0.4%～10% of a vitriolate of tartar weight of material, makes finished product through overcooling, screening again.
This method have operating procedure simple, produce flexibly, low cost and other advantages; Products obtained therefrom has characteristics such as uniform particles rounding, intensity is high, nutrient is big, slow property can be adjusted; Not only can satisfy the requirement of mechanized application, and can be as the raw material of Bulk Blending Fertilizer.
The present invention is achieved in that the method for manufacture step of this granular potassium sulfate slow release fertilizer comprises:
(1) preparation of coating agent: Viscotrol C, glycol ether, glycerine are added in the high temperature alcoholysis still, stir, be warming up to 220～230 ℃, reacted 1.2 hours under the insulation; Alcoholysis finishes, and is cooled to below 180 ℃, and blowing is gone into esterifying kettle, adds rosin glycerin ester, phthalic anhydride again; Add the refluxing xylene account for material total amount 6%, continue to be warming up to 210～220 ℃, treat that solid materials melts after, stir; Be incubated 210～220 ℃ of backflow esterification to acid values and reach below 8, cooling, blowing gets into dilution still (in advance thinner YLENE being added); Stir, filter discharging.
The ratio range of each component of coating agent is among the present invention: Viscotrol C 200～250 parts of (quality), glycol ether 50～80 parts of (quality), glycerine 60～90 parts of (quality), rosin glycerin ester 10～50 parts of (quality), phthalic anhydride 50～150 parts of (quality), 200～500 parts of YLENE (quality).
(2) coating of granular potassium sulfate: a certain amount of particulate state vitriolate of tartar is joined in the fluidized-bed coating machine; Control fluidized-bed coating machine hot blast temperature is 65～90 ℃; The control intake pressure keeps granular potassium sulfate to be suspended state; A certain amount of coating agent is injected to certain flow carries out coating on the granular potassium sulfate, coating is finished and is cooled off, sieves, and qualified particle gets product through packing.
The particle diameter of the slow-releasing granules vitriolate of tartar that the present invention makes is 1～4.75 millimeter.In actual production, also can confirm its scope by the product cut size requirement.
The defective particle that particle diameter is bigger in the production process of the present invention generally can be controlled in 5%, and this portioned product can be packaged into slowly-releasing macrobead vitriolate of tartar separately, also can deliver to the granular potassium sulfate production plant and reprocess.
The present invention's coating agent usage quantity in granulation process is 0.4%～10% of a material total mass.Be noted that: coating agent usage quantity influences the slow-release period of product.Coating agent usage quantity is many more, and the slow phase that obtains product is long more.
The granular potassium sulfate slow release fertilizer potassium oxide content that the present invention makes has relation with the particulate state vitriolate of tartar raw material of selecting for use, and gained slow-releasing granules potassium product potassium oxide content is generally than granular potassium sulfate raw material potassium oxide content low 0.4%～10%.
Technology of the present invention has the following advantages:
The slow-releasing granules potassium product that adopts the inventive method to produce, smooth surface, particle rounding, physical strength height.
Adopt the slow-releasing granules potassium product of the inventive method production, can be used as the raw material of Bulk Blending Fertilizer.
The slow-releasing granules potassium product that adopts the inventive method to produce, slow-release period can reach 3～18 months.
Technical process of the present invention is short, easy to operate, energy consumption is low.
Description of drawings
Fig. 1 is that instance 1 product is at 25 degrees centigrade of water-soluble rate curve figure of going out of bubbly water.X-coordinate is represented the soak time of fertilizer in water, and ordinate zou is represented the solubility rate of potassium in water.
Fig. 2 is that instance 2 products are at 25 degrees centigrade of water-soluble rate curve figure of going out of bubbly water.X-coordinate is represented the soak time of fertilizer in water, and ordinate zou is represented the solubility rate of potassium in water.
Embodiment:
Through following instance, process method of the present invention is described.But instance is not a limitation of the present invention.
Instance 1
(1) preparation of coating agent: Viscotrol C 230 parts of (quality), glycol ether 62 parts of (quality), glycerine 61 parts (quality) are added in the high temperature alcoholysis still, stir, be warming up to 223 ℃, reacted 1.2 hours under the insulation; Alcoholysis finishes, and is cooled to 175 ℃, and blowing is gone into esterifying kettle, adds rosin glycerin ester 40.6 parts of (quality), 130 parts of phthalic anhydrides (quality) again; Add YLENE 31 parts (quality) and reflux, continue to be warming up to 217 ℃, treat that solid materials melts after, stir; Be incubated 216～220 ℃ of backflows, esterification to acid value reaches 7.5, cooling, and blowing gets into dilution still (in advance thinner YLENE 300 parts (quality) being added); Stir, filter discharging.
(2) coating of granular potassium sulfate: 300 kilograms of particulate state vitriolate of tartar are joined in the fluidized-bed coating machine; Control fluidized-bed coating machine hot blast temperature is 78 ℃; Control spout pressure keeps granular potassium sulfate to be suspended state; 6 kilograms of coating agent are injected to 25 kilograms flow per hour carry out coating on the granular potassium sulfate, coating is finished and is cooled off, sieves, and qualified particle gets product through packing.
According to the measuring method of national standard slow release fertilizer GB/T 23348-2009, measure the slow-releasing of instance 1 product in 25 ℃ of water, result such as Figure of description 1.The slow-release period of instance 1 product is 5 months.
Instance 2
(1) preparation of coating agent: Viscotrol C 220 parts of (quality), glycol ether 60 parts of (quality), glycerine 65 parts (quality) are added in the high temperature alcoholysis still, stir, be warming up to 220 ℃, reacted 1.2 hours under the insulation; Alcoholysis finishes and is cooled to below 178 ℃, and blowing is gone into esterifying kettle, adds rosin glycerin ester 42.8 parts of (quality), 120 parts of phthalic anhydrides (quality) again, adds YLENE 30 parts (quality) and refluxes; Continue to be warming up to 216 ℃, treat that solid materials melts after, stir; Be incubated 215～220 ℃ of backflow esterification to acid values and reach 7.3, cooling, blowing gets into dilution still (in advance thinner YLENE 350 parts (quality) being added); Stir, filter discharging.
(2) coating of granular potassium sulfate: 280 kilograms of particulate state vitriolate of tartar are joined in the fluidized-bed coating machine; Control fluidized-bed coating machine hot blast temperature is 81 ℃; The control intake pressure keeps granular potassium sulfate to be suspended state; 14 kilograms of coating agent are injected to 25 kilograms flow per hour carry out coating on the granular potassium sulfate, coating is finished and is cooled off, sieves, and qualified particle gets product through packing.
According to the measuring method of national standard slow release fertilizer GB/T 23348-2009, measure the slow-releasing of instance 2 products in 25 ℃ of water, result such as Figure of description 2.The slow-release period of instance 2 products is 12 months.
Claims (3)
1. the working method of a granular potassium sulfate slow release fertilizer is characterized in that the step of this method comprises:
(1) preparation of coating agent: Viscotrol C, glycol ether, glycerine are added in the high temperature alcoholysis still, stir, be warming up to 220～230 ℃, reacted 1.2 hours under the insulation; Alcoholysis finishes, and is cooled to below 180 ℃, and blowing is gone into esterifying kettle, adds rosin glycerin ester, phthalic anhydride again; Add the refluxing xylene account for material total amount 6%, continue to be warming up to 210～220 ℃, treat that solid materials melts after, stir; Be incubated 210～220 ℃ of backflows, esterification to acid value reaches below 8, cooling, and blowing gets into dilution still (in advance thinner YLENE being added); Stir, filter discharging.
(2) coating of granular potassium sulfate: a certain amount of particulate state vitriolate of tartar is joined in the fluidized-bed coating machine; Control fluidized-bed coating machine hot blast temperature is 65～90 ℃; The control intake pressure keeps granular potassium sulfate to be suspended state; A certain amount of coating agent is injected to certain flow carries out coating on the granular potassium sulfate, coating is finished and is cooled off, sieves, and qualified particle gets product through packing.
2. the working method of a granular potassium sulfate slow release fertilizer as claimed in claim 1 is characterized in that each component ratio range of coating agent is: Viscotrol C 200～250 parts of (quality), glycol ether 50～80 parts of (quality), glycerine 60～90 parts of (quality), rosin glycerin ester 10～50 parts of (quality), phthalic anhydride 50～150 parts of (quality), 200～500 parts of YLENE (quality).
3. the working method of a granular potassium sulfate slow release fertilizer as claimed in claim 1 is characterized in that coating agent usage quantity is 0.4%～10% of a material total mass.
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| CN201210084468.4A CN102701832B (en) | 2012-03-28 | 2012-03-28 | Production method of granular potassium sulfate slow-release fertilizer |
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| CN201210084468.4A CN102701832B (en) | 2012-03-28 | 2012-03-28 | Production method of granular potassium sulfate slow-release fertilizer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105859449A (en) * | 2016-06-17 | 2016-08-17 | 安庆市富江水产养殖有限公司 | Controlled release fertilizer for aquatic plants in aquaculture pond |
| CN106116941A (en) * | 2016-06-17 | 2016-11-16 | 安庆市富江水产养殖有限公司 | A kind of low cost slow release Aquatic product pond pasture and water special fertilizer |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9416064B2 (en) | 2013-08-07 | 2016-08-16 | Chinese Academy of Agricultural Sciences Institute of Agricultural Resources and Regional Planning | Method for producing controlled-release fertilizer coated with polyurethane |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87105366A (en) * | 1986-07-30 | 1988-02-10 | 窒素公司 | Granular potassium sulfate and method for producing same |
| CN101182269A (en) * | 2007-12-03 | 2008-05-21 | 中国农业大学 | Water polymer integument and method for preparing integument controlled-release fertilizer thereof |
| KR20090024325A (en) * | 2007-09-04 | 2009-03-09 | 한국지질자원연구원 | The process for manufacturing mineral particle controlled release fertilizer granules |
| CN101648837A (en) * | 2009-09-11 | 2010-02-17 | 中国海洋石油总公司 | Polyurethane filmcoated controlled release fertilizer and preparation method thereof |
-
2012
- 2012-03-28 CN CN201210084468.4A patent/CN102701832B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87105366A (en) * | 1986-07-30 | 1988-02-10 | 窒素公司 | Granular potassium sulfate and method for producing same |
| KR20090024325A (en) * | 2007-09-04 | 2009-03-09 | 한국지질자원연구원 | The process for manufacturing mineral particle controlled release fertilizer granules |
| CN101182269A (en) * | 2007-12-03 | 2008-05-21 | 中国农业大学 | Water polymer integument and method for preparing integument controlled-release fertilizer thereof |
| CN101648837A (en) * | 2009-09-11 | 2010-02-17 | 中国海洋石油总公司 | Polyurethane filmcoated controlled release fertilizer and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 蒋悦 等: "包模型缓释肥的开发与研究进展", 《三峡大学学报（自然科学版）》 * |
| 邹洪涛 等: "包膜缓/控释肥料的膜质材料研究进展", 《中国土壤学会第十一届全国会员代表大会暨第七届海峡两岸土壤肥料学术交流研讨会论文集（上）》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105859449A (en) * | 2016-06-17 | 2016-08-17 | 安庆市富江水产养殖有限公司 | Controlled release fertilizer for aquatic plants in aquaculture pond |
| CN106116941A (en) * | 2016-06-17 | 2016-11-16 | 安庆市富江水产养殖有限公司 | A kind of low cost slow release Aquatic product pond pasture and water special fertilizer |
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| CN102701832B (en) | 2014-01-22 |
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