CN1556072A - Manufacturing method of nitrogen phosphorus potassium cmposite fertilizer rich in nitrogen and potassium - Google Patents
Manufacturing method of nitrogen phosphorus potassium cmposite fertilizer rich in nitrogen and potassium Download PDFInfo
- Publication number
- CN1556072A CN1556072A CNA2004100234301A CN200410023430A CN1556072A CN 1556072 A CN1556072 A CN 1556072A CN A2004100234301 A CNA2004100234301 A CN A2004100234301A CN 200410023430 A CN200410023430 A CN 200410023430A CN 1556072 A CN1556072 A CN 1556072A
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- CN
- China
- Prior art keywords
- nitrogen
- potassium
- phosphorus
- compound fertilizer
- potassium compound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003337 fertilizer Substances 0.000 title claims abstract description 47
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 27
- 229910052700 potassium Inorganic materials 0.000 title claims abstract description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims description 52
- 238000004519 manufacturing process Methods 0.000 title claims description 25
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 title claims description 17
- 239000011591 potassium Substances 0.000 title claims description 17
- WZLMXYBCAZZIRQ-UHFFFAOYSA-N [N].[P].[K] Chemical compound [N].[P].[K] WZLMXYBCAZZIRQ-UHFFFAOYSA-N 0.000 title claims description 4
- 238000001816 cooling Methods 0.000 claims abstract description 24
- 239000002994 raw material Substances 0.000 claims abstract description 20
- 239000000843 powder Substances 0.000 claims abstract description 18
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000004202 carbamide Substances 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 14
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000011575 calcium Substances 0.000 claims abstract description 13
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 13
- 239000002131 composite material Substances 0.000 claims abstract description 10
- 239000007787 solid Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 22
- 239000007921 spray Substances 0.000 claims description 19
- -1 chloro nitrogen-phosphorus-potassium Chemical compound 0.000 claims description 16
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 14
- XAJJCYVOQRQZNS-UHFFFAOYSA-N [K].[K].[P].[N] Chemical compound [K].[K].[P].[N] XAJJCYVOQRQZNS-UHFFFAOYSA-N 0.000 claims description 14
- 239000002002 slurry Substances 0.000 claims description 12
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical group [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims description 11
- 230000008018 melting Effects 0.000 claims description 11
- 241000209094 Oryza Species 0.000 claims description 10
- 235000007164 Oryza sativa Nutrition 0.000 claims description 10
- 230000005496 eutectics Effects 0.000 claims description 10
- 235000009566 rice Nutrition 0.000 claims description 10
- 208000006558 Dental Calculus Diseases 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 239000011268 mixed slurry Substances 0.000 claims description 8
- 229910021529 ammonia Inorganic materials 0.000 claims description 7
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 7
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims description 7
- 235000019837 monoammonium phosphate Nutrition 0.000 claims description 7
- 239000006012 monoammonium phosphate Substances 0.000 claims description 7
- 239000005696 Diammonium phosphate Substances 0.000 claims description 6
- 241000196324 Embryophyta Species 0.000 claims description 6
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims description 6
- 229910000388 diammonium phosphate Inorganic materials 0.000 claims description 6
- 235000019838 diammonium phosphate Nutrition 0.000 claims description 6
- 238000003786 synthesis reaction Methods 0.000 claims description 6
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims description 5
- 241000276489 Merlangius merlangus Species 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 239000011876 fused mixture Substances 0.000 abstract 1
- 238000005507 spraying Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 17
- 239000000654 additive Substances 0.000 description 5
- 230000000996 additive effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 235000015097 nutrients Nutrition 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Fertilizers (AREA)
Abstract
A composite NPK fertilizer with high contents of K and N is prepaed through proportionally mixing molten or solid urea at 125-135 deg.C, powdered K-contained raw material at 110-135 deg, granular P-contained raw material at 90-110 deg.C and calcium powder to obtain a fused mixture, and spraying it in a large cooling tower to obtain powdered or granular target fertilizer.
Description
Technical field
The present invention relates to the manufacture method of nitrogen-phosphorus-potassium compound fertilizer, is the manufacture method that a kind of tower rotation spray granulating is produced the high nitrogen and potassium nitrogen-phosphorus-potassium compound fertilizer.
Background technology
The high-concentration compound N-P-K fertilizer of adopting tower rotation spray granulating method production is the novel process that this area was brought into use in recent years, how the deficiency that exists in this technology improved, and be the problem that those skilled in the art make great efforts to study.From disclosed document (number of patent application: 02103008.1,99127009.6) content, the not enough of them obviously exists: the raw material of use is restricted, and is unfavorable for process adjustments, influences the technology driving rate; The production kind is few, can not meet the need of market; Heating energy consumption height, and the ammonia loss is arranged, cause the production cost height; The viscosity of mixed slurry should not be regulated, easy blocking sprayer, and output capacity is low etc.
Summary of the invention
The objective of the invention is, a kind of manufacture method of high nitrogen and potassium nitrogen-phosphorus-potassium compound fertilizer is provided, it can adapt to various phosphorous, potassium raw materials, and can produce various high nitrogen and potassium nitrogen-phosphorus-potassium compound fertilizers, and production cost is low etc.
The present invention is in order to finish goal of the invention; provide following technical scheme: the urea melting liquid or solid urea of synthesis ammonia plant production is heated to 125-135 ℃; granularity contains the potassium raw material less than 1 millimeter powder and is heated to 110-135 ℃ or be heated to 90-110 ℃ granularity and add calcium powder less than 1 millimeter phosphorous raw material; insert mix 2-10 minute in the mixing tank after; formation temperature 110-135 ℃; viscosity is 1500-2500cPa.s; the mixed slurry eutectic of good fluidity; adopting rotation spray granulating machine that molten slurry is sprayed into virtual height then is that 6-20 rice or 65 rice diameters are in the atmospheric cooling tower of 6-20 rice greater than 50 rice diameters, is cured as powdery or granular high nitrogen and potassium composite fertilizer by air cooling.It is Repone K, vitriolate of tartar, chloro nitrogen-phosphorus-potassium compound fertilizer and sulfenyl nitrogen-phosphorus-potassium compound fertilizer that powder contains the potassium raw material.Phosphorous powder raw material is monoammonium phosphate, diammonium phosphate, coarse whiting, general calcium and nitrogen-phosphorus-potassium compound fertilizer.The additional proportion of urea melting liquid, monoammonium phosphate or diammonium phosphate, Repone K or vitriolate of tartar is 2-10: 1-6: 2-10 (weight ratio).The additional proportion of urea melting liquid, chloro nitrogen-phosphorus-potassium compound fertilizer or sulfenyl nitrogen-phosphorus-potassium Hefei, Repone K or vitriolate of tartar is: 0.1-1: 1: 0.1-1 (weight ratio).The viscosity of the product mixed slurry eutectic that nitrogen content is high is controlled to be 1500-2000cPa.s, and mixing time is 2-3.8 minute.The product mixed slurry viscosity that potassium content is high is controlled to be 2000-2500cPa.s, and mixing time is 7.9-10 minute.The viscosity that uses chloro nitrogen-phosphorus-potassium compound fertilizer or sulfenyl nitrogen-phosphorus-potassium compound fertilizer to do raw material is 1800-2300cPa.s, and mixing time is 5-10 minute.The amount that adds calcium powder is the 11-35% of total raw material.
Contribution of the present invention is: through a large amount of tests, enlarged manufacturing high nitrogen and potassium nitrogen-phosphorus-potassium compound fertilizer raw material range, and make it be beneficial to process adjustments etc., manufacturing process places in the optimum range and can cut down the consumption of energy by a relatively large margin, the product that adopts the present invention to make, can make and all have a cavernous structure on each product particle, can dissolve fast, and can be effectively false proof, can do quick-acting fertilizer and the use of topdressing, satisfying the nutrient of the farm crop economic crop growth that needed nutrient, particularly added value are high in the different seasons of growth, than homemade 15-15-15 specification composite fertilizer volume increase 18%, 20%, 18%.
The high nitrogen and potassium nitrogen-phosphorus-potassium compound fertilizer that the inventive method is made, nitrogen content can reach 16-30% (nutrient), and potassium content can reach 16-25% (nutrient).The air cooling that slip of the present invention adopts rotation spray granulating machine to spray in the atmospheric cooling tower can be a naturally cooling; it also can be mandatory ventilation cooling; the virtual height of cooling tower is generally greater than 65 meters during naturally cooling; diameter 6-20 rice; the virtual height of the atmospheric cooling tower that forced ventilation is cold should be greater than 50 meters, and diameter 6-20 rice flashes away to guarantee the slip water that sprays in the atmospheric cooling tower; do not make the slip knot that sprays on the tower body surface, satisfy manufacturing technique requirent.
The vital role that the present invention controls the viscosity of mixed slurry eutectic is to make final product, both met GB, accomplish that again outward appearance is evenly attractive in appearance, and produce and stablize the output capacity height, the returning charge amount is little, running cost is low, the composite fertilizer that adopts manufacture method of the present invention to produce, and the main products specification is 1, makes raw material with monoammonium phosphate, diammonium phosphate, coarse whiting, general calcium and Repone K, vitriolate of tartar: 20-15-10,22-10-10,22-8-16,24-6-15,26-4-15 etc.; 2, be raw material: 24-6-15,20-6-20 etc. with chloro nitrogen-phosphorus-potassium compound fertilizer and sulfenyl nitrogen-phosphorus-potassium compound fertilizer.
The characteristics that manufacture method of the present invention is outstanding mainly show following several respects: it can make full use of the heat energy of fusing urea, make that spray cooling solidified material moisture is very low, need not again can to satisfy requirement to water content through drying process, shortened technical process, saved the operator, reduced about 60% energy consumption; Can produce the high nitrogen and potassium type complex fertilizer product of a plurality of proportionings, a plurality of kinds; The yield rate height, the returning charge amount is low in the production process, can reduce the mechanical loss and the power consumption of product, and finished product reaches more than 98%; The product particle slyness; Prevented from caking, three-waste free discharge, for large-scale production equipment, initial cost and working cost are all low than other technology prilling granulator, and the initial cost of identical scale can save 30%, and working cost can reduce by 40%; Each product particle all has a cavernous structure, not only can be false proof and dissolution rate is fast, easily make quick-acting fertilizer and the use of topdressing; Enlarged the scope of desired raw material, helped process adjustments, the inside and outside quality of product all is better than the product of domestic other explained hereafter, fully can import substitutes.
Embodiment
Embodiment 1:
Get the urea melting liquid 307kg that synthesis ammonia plant is produced; be heated to 90 ℃ with horizontal heater; granularity is heated to 135 ℃ less than 1 millimeter powder diammonium phosphate 326kg with horizontal heater; granularity is less than 1 millimeter Repone K 167kg; the calcium powder additive that adds 200kg again; mixed 3.8 minutes through mixing tank; slurry temperature is 120 ℃; viscosity is the slip eutectic of 1800cPa.s; it is in 65 meters the air naturally cooling that molten slurry sprays into virtual height through rotation spray granulating machine; be cured as granular high nitrogen and potassium composite fertilizer by air cooling; product specification is 20-15-10; moisture is 1.10%, and yield rate is 98.5%.
Embodiment 2:
Get the urea melting liquid area 438kg that solid urea is heated to 130 ℃; be heated to 110 ℃ with horizontal heater; granularity is heated to 135 ℃ less than 1 millimeter powder monoammonium phosphate 178kg with horizontal heater; granularity is less than 1 millimeter Repone K 267kg; the calcium powder additive that adds 117kg again; mixed 9 minutes through mixing tank; slurry temperature is 120 ℃; viscosity is the slip eutectic of 2000cPa.s; it is in 65 meters the air naturally cooling that molten slurry sprays into virtual height through rotation spray granulating machine; be cured as granular high nitrogen and potassium composite fertilizer by air cooling; product specification is 22-8-16; moisture is 1.2.%, and yield rate is 98.8%.
Embodiment 3:
Get the urea melting liquid 271kg that synthesis ammonia plant is produced; be heated to 115 ℃ with horizontal heater; granularity is less than 1 millimeter; specification is the sulfenyl nitrogen-phosphorus-potassium compound fertilizer of 13.2-17.5-14.3 and is heated to 135 ℃ with horizontal heater; granularity is less than 1 millimeter Repone K 31kg; the calcium powder additive that adds 126.5kg again; mixed 3 minutes through mixing tank; slurry temperature is 116 ℃; viscosity is the slip eutectic of 2200cPa.s; it is in 65 meters the air naturally cooling that molten slurry sprays into virtual height through rotation spray granulating machine; be cured as granular high nitrogen and potassium composite fertilizer by air cooling; product specification is 20-10-10; moisture is 1.0%, and yield rate is 98%.
Embodiment 4:
Get the urea melting liquid 423kg that synthesis ammonia plant is produced; be heated to 115 ℃ with horizontal heater; granularity is less than 1 millimeter; specification is the sulfenyl nitrogen-phosphorus-potassium compound fertilizer of 13.2-17.5-14.3 and is heated to 135 ℃ with horizontal heater; granularity is less than 1 millimeter Repone K 168kg; the calcium powder additive that adds 98kg again; mixed 2.5 minutes through mixing tank; slurry temperature is 116 ℃; viscosity is the slip eutectic of 2400cPa.s; it is in 65 meters the air naturally cooling that molten slurry sprays into virtual height through rotation spray granulating machine; be cured as powdery high nitrogen and potassium composite fertilizer by air cooling; product specification is 24-6-15; moisture is 1.15%, and yield rate is 98%.
Embodiment 5:
Get the urea melting liquid 427.5kg that synthesis ammonia plant is produced; be heated to 90 ℃ with horizontal heater; granularity is heated to 135 ℃ less than 1 millimeter powdery monoammonium phosphate 222kg with horizontal heater; granularity is less than 1 millimeter vitriolate of tartar 192kg; the calcium powder additive that adds 159kg again; mixed 3.8 minutes through mixing tank; slurry temperature is 120 ℃; viscosity is the slip eutectic of 1900cPa.s; it is in 65 meters the air naturally cooling that molten slurry sprays into virtual height through rotation spray granulating machine; be cured as granular high nitrogen and potassium composite fertilizer by air cooling; product specification is 22-10-10; moisture is 1.16%, and yield rate is 98.5%.
Claims (9)
1; a kind of manufacture method of high nitrogen and potassium nitrogen-phosphorus-potassium compound fertilizer; it is characterized in that: the urea melting liquid or solid urea of synthesis ammonia plant production is heated to 125-135 ℃; granularity contains the potassium raw material less than 1 millimeter powder and is heated to 110-135 ℃ or be heated to 90-110 ℃ granularity and add calcium powder less than 1 millimeter phosphorous raw material; insert mix 2-10 minute in the mixing tank after; formation temperature 110-135 ℃; viscosity is 1500-2500cPa.s; the mixed slurry eutectic of good fluidity; adopting rotation spray granulating machine that molten slurry is sprayed into virtual height then is that 6-20 rice or 65 rice diameters are in the atmospheric cooling tower of 6-20 rice greater than 50 rice diameters, is cured as powdery or granular high nitrogen and potassium composite fertilizer by air cooling.
2, the manufacture method of a kind of high nitrogen and potassium nitrogen-phosphorus-potassium compound fertilizer according to claim 1 is characterized in that: it is Repone K, vitriolate of tartar, chloro nitrogen-phosphorus-potassium compound fertilizer and sulfenyl nitrogen-phosphorus-potassium compound fertilizer that powder contains the potassium raw material.
3, the manufacture method of a kind of high nitrogen and potassium nitrogen-phosphorus-potassium compound fertilizer according to claim 1 is characterized in that: phosphorous powder raw material is monoammonium phosphate, diammonium phosphate, coarse whiting, general calcium and nitrogen-phosphorus-potassium compound fertilizer.
4, according to claim 1, it is characterized in that: the additional proportion of urea melting liquid, monoammonium phosphate or diammonium phosphate, Repone K or vitriolate of tartar is 2-10: 1-6: 2-10 (weight ratio).
5, the manufacture method of a kind of high nitrogen and potassium nitrogen-phosphorus-potassium compound fertilizer according to claim 1 is characterized in that: the additional proportion of urea melting liquid, chloro nitrogen-phosphorus-potassium compound fertilizer or sulfenyl nitrogen-phosphorus-potassium Hefei, Repone K or vitriolate of tartar is: 0.1-1: 1: 0.1-1 (weight ratio).
6, the manufacture method of a kind of high nitrogen and potassium nitrogen-phosphorus-potassium compound fertilizer according to claim 1 is characterized in that: the viscosity of the product mixed slurry eutectic that nitrogen content is high is controlled to be 1500-2000cPa.s, and mixing time is 2-3.8 minute.
7, the manufacture method of a kind of high nitrogen and potassium nitrogen-phosphorus-potassium compound fertilizer according to claim 1 is characterized in that: the product mixed slurry viscosity that potassium content is high is controlled to be 2000-2500cPa.s, and mixing time is 7.9-10 minute.
8, according to the manufacture method of claim 1 or 4 described a kind of high nitrogen and potassium nitrogen-phosphorus-potassium compound fertilizers, it is characterized in that: the viscosity that uses chloro nitrogen-phosphorus-potassium compound fertilizer or sulfenyl nitrogen-phosphorus-potassium compound fertilizer to do raw material is 1800-2300cPa.s, and mixing time is 5-10 minute.
9, the manufacture method of a kind of high nitrogen and potassium nitrogen-phosphorus-potassium compound fertilizer according to claim 1 is characterized in that: the amount that adds calcium powder is the 11-35% of total raw material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410023430 CN1255362C (en) | 2004-01-12 | 2004-01-12 | Manufacturing method of nitrogen phosphorus potassium cmposite fertilizer rich in nitrogen and potassium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410023430 CN1255362C (en) | 2004-01-12 | 2004-01-12 | Manufacturing method of nitrogen phosphorus potassium cmposite fertilizer rich in nitrogen and potassium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1556072A true CN1556072A (en) | 2004-12-22 |
| CN1255362C CN1255362C (en) | 2006-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410023430 Expired - Lifetime CN1255362C (en) | 2004-01-12 | 2004-01-12 | Manufacturing method of nitrogen phosphorus potassium cmposite fertilizer rich in nitrogen and potassium |
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| CN (1) | CN1255362C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101439999B (en) * | 2008-12-31 | 2011-06-01 | 聊城鲁西化工第五化肥厂 | Apparatus for improving nitrogen content of spray granulation compound fertilizer and method for producing high-nitrogen compound fertilizer |
| CN101152622B (en) * | 2006-09-26 | 2013-04-10 | 霍尼韦尔国际公司 | Granulation method |
| CN107216220A (en) * | 2017-07-28 | 2017-09-29 | 车莉 | A kind of production method for high nitrogen fertilizer of whitewashing |
| CN108530226A (en) * | 2018-05-18 | 2018-09-14 | 高英林 | A kind of highly acid composite fertilizer that phosphorus potassium utilization rate can be made to improve 3 to 5 times |
| CN112707757A (en) * | 2021-01-28 | 2021-04-27 | 云南中正化学工业有限公司 | Environment-friendly compound fertilizer and preparation process thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101265129B (en) * | 2008-04-16 | 2010-09-01 | 江苏华昌化工股份有限公司 | Composite nitrogen fertilizer |
-
2004
- 2004-01-12 CN CN 200410023430 patent/CN1255362C/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101152622B (en) * | 2006-09-26 | 2013-04-10 | 霍尼韦尔国际公司 | Granulation method |
| CN101439999B (en) * | 2008-12-31 | 2011-06-01 | 聊城鲁西化工第五化肥厂 | Apparatus for improving nitrogen content of spray granulation compound fertilizer and method for producing high-nitrogen compound fertilizer |
| CN107216220A (en) * | 2017-07-28 | 2017-09-29 | 车莉 | A kind of production method for high nitrogen fertilizer of whitewashing |
| CN108530226A (en) * | 2018-05-18 | 2018-09-14 | 高英林 | A kind of highly acid composite fertilizer that phosphorus potassium utilization rate can be made to improve 3 to 5 times |
| CN112707757A (en) * | 2021-01-28 | 2021-04-27 | 云南中正化学工业有限公司 | Environment-friendly compound fertilizer and preparation process thereof |
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| Publication number | Publication date |
|---|---|
| CN1255362C (en) | 2006-05-10 |
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