CN101041603A - Preparation technical method of urine sulfur radical composite fertilizer - Google Patents
Preparation technical method of urine sulfur radical composite fertilizer Download PDFInfo
- Publication number
- CN101041603A CN101041603A CN 200710048574 CN200710048574A CN101041603A CN 101041603 A CN101041603 A CN 101041603A CN 200710048574 CN200710048574 CN 200710048574 CN 200710048574 A CN200710048574 A CN 200710048574A CN 101041603 A CN101041603 A CN 101041603A
- Authority
- CN
- China
- Prior art keywords
- slip
- urea
- urine
- composite fertilizer
- technical method
- 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
Images
Landscapes
- Fertilizers (AREA)
Abstract
The invention discloses a manufacturing method of urea-sulfur based composite fertilizer, which comprises the following steps: (1) reacting sulfuric acid and phosphor according to certain proportion; obtaining acidolyzed slurry; (2) adding quantitative aquacare and slurry into transmitting reactor; obtaining the transmitted slurry; (3) solidifying the product; obtaining the product. The invention adopts phosphor ore as phosphorous source, which saves investing cost effectively.
Description
Technical field:
The present invention relates to the preparing compound fertilizer technology, more particularly, relate to a kind of urine sulfenyl nitrogen-phosphorus preparing compound fertilizer Technology.
Background technology:
Plant growth will need 16 kinds of essential nutritive elements, and with regard to importance, wherein nitrogen, phosphorus, potassium element occupy front three.Soil regime by China, the azophoska ratio that crop growth needs is roughly 2: 1: 1, but in the agriculture production fertilising of China, the ratio long-run disturbance of nitrogen (N), phosphorus (P), potassium (K) fertilizer, be lower than reasonable levels, trace it to its cause, except the output of potash fertilizer is hanged down, lack composite fertilizer's technology that production can provide multiple nutrients such as nitrogen phosphorus potassium simultaneously besides.The phosphorus ammonium is the bigger compound nitrogen phosphate fertilizer of present usage quantity, but the N in the phosphorus ammonium is generally 10%～18%, P2O5 is generally 46%～52%, generally all it is considered as phosphate fertilizer, in addition, sulphur and calcium constituent are removed in the production process of phosphorus ammonium, therefore, the phosphorus ammonium is not that the compound nitrogen phosphate fertilizer that contains sulphur, calcium nutrient that satisfies the agriculture production needs really can be provided, in order to satisfy the needs of crop growth, often need to add in addition nitrogen, potassium, calcium and element sulphur nutrient to nitrogen, potassium, sulphur and calcium constituent nutrient.It is to produce with urea and normal superphosphate (being called for short general calcium) that prior art is produced the simpler and more direct way of compound nitrogen phosphate fertilizer that contains sulphur, calcium nutrient, the compound nitrogen phosphate fertilizer that adopts this method to produce, in theory because general calcium is comparatively cheap, and sulphur and calcium constituent have been contained, therefore both relatively comprehensively, cost was lower again for the contained nutrient of producing of compound nitrogen phosphate fertilizer.But in the process with urea and general calcium production composite fertilizer, urea and normal superphosphate can discharge a large amount of crystal water and free-water after reacting, and reactant becomes thin mud, the rerum natura extreme difference.So urea and normal superphosphate are difficult to compatibility, could mix after generally need neutralizing.France finds in the Sophia-Antipolis research centre that the complex compound that urea and sulfuric acid form can continue tricalcium phosphate is leached.The maximum fertiliser production company (Grande Paroisse) of France has adopted this achievement.Its production method main technique step is that elder generation mixes generation sulfuric acid urine with sulfuric acid in fixed ratio (is 1.6: 1 or 3.6: 1 as urea and vitriolic mol ratio) with urea, reacts with phosphorus ore again, changes into then and slaking.The general calcium Production Flow Chart of urea of France Grande Paroisse company exploitation, it can obtain the N/P ratio example that can expect again in order to avoid keep away the bad problem of composite fertilizer's rerum natura of production.R﹠D institutions such as Chinese Shanghai chemical research institute, Sichuan University to urea general calcium Production Flow Chart also study; some achievements have been obtained; but all there is not industrialization so far; its major cause is that the reactive behavior of sulfuric acid urine is lower; thereby cause the transformation efficiency of phosphorus lower (being generally below 10%) in the phosphorus ore; also be difficult to simultaneously solidify, be difficult to adapt to many phosphorus ores of China.
Summary of the invention
The problem that exists at the urine S-based compound fertilizer preparation technology of prior art, purpose of the present invention aims to provide a kind of novel preparation technical method of urine sulfur radical composite fertilizer, low and product is difficult to the solidified problem with the transformation efficiency that solves phosphorus in the phosphorus ore that prior art urine S-based compound fertilizer preparation technology exists, and the composite fertilizer that produces has comparatively ideal N/P ratio, contain abundant sulphur calcium constituent, there is not the phosphogypsum emission problem in production process, the fluorine gas that overflows in the reaction is between the general calcium technology of urea of general calcium and routine, directly granulation and can add potassium element in the production, production cost is lower.
Preparation technical method of urine sulfur radical composite fertilizer disclosed by the invention combines the production method of normal superphosphate and the production method of the general calcium of French urea, has drawn both advantages, has avoided both shortcomings.
Preparation technical method of urine sulfur radical composite fertilizer disclosed by the invention mainly comprises the next coming in order processing step:
1, will add the acidolysis reaction device according to true quantitative sulfuric acid of complex fertilizer product phosphorus sulphur design of components ratio and phosphorus ore, phosphorus ore will be carried out acidolysis reaction, produce the acidolysis slip;
2, will carry out the urea conversion reaction according to complex fertilizer product nitrogen phosphorus sulphur true quantitative urea of design of components ratio and acidolysis slip adding conversion reactor, produce the conversion slip;
3, carry out product solidification processing to transforming slip, produce urine S-based compound fertilizer product.
In the acidolysis reaction process of the sulfuric acid solution phosphorus ore of technique scheme, the present invention has made full use of hydrionic reactive behavior, and the thermogenetic comparatively high temps of reaction, strengthened the acidolysis reaction process, make the following principal reaction that takes place in this operation obtain fully carrying out:
Ca
5(PO
4)
3F+5H
2SO
4+2.5H
2O→3H
2PO
4+CaSO
4·1/2H
2O+HF
Ca
5(PO
4)
3F+7H
3PO
4+5H
2O→5Ca(H
2PO
4)
2+HF
2Ca
5(PO
4)
3F+7H
2SO
4+6.5H
2O→3Ca(H
2PO
4)
2·H
2O+7CaSO
4·1/2H
2O+2HF
Urea in technique scheme is converted in the conversion reaction process of sulphur ammonium, and acidolysis slip and urea react, and urea is generated comprise the urea double salt of urea gypsum etc., wherein has sub-fraction urea to be converted into the sulphur ammonium, and total nitrogen loss is minimum.Following reaction mainly takes place in this processing sequence:
CaSO
4·1/2H
2O+4CO(NH
2)
2→CaSO
4·4CO(NH
2)
2+1/2H
2O
H
2SO
4+2H
2O+CO(NH
2)
2→(NH
4)
2SO
4·H
2O+CO
2↑
Ca(H
2PO
4)
2·H
2O+4CO(NH
2)
2→4Ca(H
2PO
4)
2·CO(NH
2)
2+H
2O
The conversion slip that comes out from conversion reactor obtains multiple complex salt crystal after solidification treatment, prepare the good compound nitrogen phosphate fertilizer of rerum natura.The conversion slip that comes out from conversion reactor is cured to be handled the mode of producing urine S-based compound fertilizer product and has two kinds, a kind of is to be introduced into digestion tank from the conversion slip that conversion reactor comes out to carry out the ageing solidification treatment, becomes urine S-based compound fertilizer product with crusher in crushing again after the curing; Another kind is to spray into tablets press from the conversion slip that conversion reactor comes out with spray gun to carry out granulation, produces urine S-based compound fertilizer product.Adopt the latter to carry out products solidifying when handling, directly spray in the material curtain granulation process of being taken up by flight in the tablets press will transforming slip, also can add sylvite simultaneously, one goes on foot the production of finishing multi-component composite fertilizer.The complex fertilizer product that the conversion slip that comes out from conversion reactor prepares through the product solidification treatment, wherein water-soluble phosphorus can account for more than 90% of available phosphorus, and the transformation efficiency of phosphorus ore can reach 82%～95%.
For with digestion tank to transforming the technology that slip carries out products solidifying, in the acidolysis reaction process with the sulfuric acid solution phosphorus ore, the form that phosphorus ore can the phosphorus ore slurry adds the acidolysis reaction device, sulfuric acid and phosphorus ore add wherein simultaneously.Phosphorus ore and vitriolic acidolysis reaction can carry out under the envrionment temperature of acidolysis reaction thermosetting, and temperature of reaction is generally 90-140 ℃.Slip after the conversion enters conversion reactor, reacts with urea, and temperature of reaction is general controlled to be made as 60-90 ℃.Reacted conversion slip enters into digestion tank, can finish curing under 50-80 ℃ temperature condition.In conversion reactor, urea can be regulated according to complex fertilizer product nutrient design of components ratio with the sulfuric acid ratio that is added, and need not be confined to the ratio (as 3.6: 1 or 1.8: 1) that the general calcium of common urea is adopted.In order to strengthen reaction, can in acidolysis reaction device and conversion reactor, add activator.The adding of activator can only add in a reaction, also can add in two reactions simultaneously.Activator commonly used has nitric acid, hydrochloric acid, KCI, lauryl amine Soxylat A 25-7-12, two methyl alkyl hydrobromic ether, cationic 12 carbon oil agent or the like.The solid substance that digestion tank comes out can be packed through fragmentation.
For with spray granulating to transforming the technology that slip carries out products solidifying, technical process mainly is a products solidifying mode difference with similar to the technical process that the conversion slip carries out products solidifying with digestion tank.The conversion slip that comes out from conversion reactor sprays on the material curtain of being taken up by flight in the spray granulating machine with spray gun, and slip is coated in particle surface, and bonding is agglomerating mutually in rolling for particle simultaneously.In tablets press, higher temperature strip helps particle solidifies, and solidify comparatively fast, but the too high meeting of temperature causes urea decomposition, and therefore will avoid temperature too high, tablets press moderate temperature is advisable not to be higher than 200 ℃.In the granulation process of tablets press, can add sylvite and produce polynary multiple fertilely, and can add suitable additive adjusting the nutrient of fertilizer, or adjust pH value, or strengthen to isolate and avoid bonding, as additives such as interpolation lime carbonate, gypsum.
Adopt the urea-base compound fertilizer based on nitrogen phosphorus (MUSP) that method of the present invention produces and be novel compound manure, contain multiple elements such as nitrogen, phosphorus, potassium, sulphur based on the urea-base compound fertilizer (MUSPK) of nitrogen phosphorus potassium.And the nutrient of normal superphosphate is single, the fertilizer utilization rate variance of executing in the ground back owing to produce phosphate reversion.If is raw material production nitrogen phosphorus fertilizer (NP) and azophoska (NPK) with urea and normal superphosphate, because the rerum natura extreme difference, general calcium can discharge moisture in the granulation process when being mixed, and makes returning charge in the granulation process than too high, drying process energy consumption height, and easily lump.One of another characteristics of the present invention be urea and general calcium in process of production by compound, can produce nitrogen, phosphorus, the multiple ratio of potassium component (20-10-0,15-10-10, composite fertilizer 20-10-10).With traditional be that the flow process of raw material production composite fertilizer is compared with urea, sulphur ammonium, phosphoric acid, ammonia, expense can reduce 10-30%.The present invention is raw material with the phosphorus ore directly, does not have the phosphogypsum pollution problem.Can utilize simultaneously remaining tailings ore deposit after China's kakoxene ore dressing, therefore have favorable economic benefit and social benefit.The major advantage of this flow process is:
(1) source of phosphorus is a Rock Phosphate (72Min BPL), and cost is cheaper than adopting the phosphorus ammonium, does not exist phosphogypsum to stack problem.
(2) contain part slow-release fertilizer component in the compound manure that makes, so fertilizer utilization ratio is improved.
(3) the fluorine gas scale of construction of Pai Chuing is lower than Common Superphosphate Process.
(4) production process is fairly simple, and cost is lower, and low equipment investment can adopt the relatively poor phosphorus ore of reactive behavior, is a kind ofly to substitute general calcium and serve as that the basis produces one of multiple fertile novel method with the phosphorus ammonium at present.
Description of drawings
Accompanying drawing 1 is the technical process of one embodiment of the invention.
Accompanying drawing 2 is technical process of another embodiment of the present invention.
Accompanying drawing 3 is technical process of another embodiment of the present invention.
Accompanying drawing 4 is the present invention's technical process of another embodiment again
Embodiment
Embodiment given below is to specific descriptions of the present invention; be necessary to be pointed out that at this; following examples only are used for that the present invention will be further described; can not be interpreted as limiting the scope of the invention, the improvement of the non-intrinsically safe that this art skilled person makes the present invention according to the invention described above content and adjust and still belong to protection scope of the present invention.
Among each embodiment, except that specifying, the umber of each component is parts by weight below, and each percentages of ingredients all is weight percentage.
Embodiment 1
The technical process of present embodiment as shown in Figure 1.Raw material adopts Liaoning kakoxene to select gained phosphorus mine tailing behind the iron, P
2O
5Be about 30%.100 parts in ground phosphate rock, 30 parts of moisture are mixed with the phosphorus ore slurry, with 40 parts of concentration be that 90% sulfuric acid adds acidolysis reaction device 1 and carries out acidolysis reaction, and add 2 parts of the two methyl alkyl bromo agent of activator, about about 130 ℃ of temperature of reaction, about about 30 minutes of reaction times.The vitriolic add-on all can 40～80 parts of scopes.The fluorine gas that produces in the acidolysis reaction enters the fluorine withdrawer, form with silicofluoride reclaims fluorine, reacted acidolysis slip enters conversion reactor 2, add 110 parts in urea simultaneously, carry out conversion reaction, and add 1 part of activator cation type 12 carbon oil agent, about about 80 ℃ of conversion reaction temperature, about about 40 minutes of reaction times.The conversion slip that comes out from conversion reactor enters into digestion tank, carries out the ageing curing reaction, and about about 60 ℃ of ageing temperature, is generally 8～16 hours at about about 10 hours of time.Fertilizer after the curing is comparatively loose, smashes with crusher and is finished product urine sulphur based compound fertilizer.N-p-k ratio in the composite fertilizer is about about 1.8: 1: 0.The phosphorus ore transformation efficiency of present embodiment is about 90%.
Embodiment 2
The technical process of present embodiment as shown in Figure 2.Raw material still adopts Liaoning kakoxene to select that the P2O5 content of gained is 30% left and right sides phosphorus mine tailing behind the iron.The technological process and the processing condition of present embodiment are substantially the same manner as Example 1, different places be that acidolysis reaction and conversion reaction all do not add activator and strengthen reaction, the time of reaction is longer, the time of acidolysis reaction is about 30～45 minutes, the time of conversion reaction is about 45～60 minutes, about about 17 hours of digestion time is generally 16～20 hours.The transformation efficiency of phosphorus ore is low, and the phosphorus ore transformation efficiency of present embodiment is about 80%.
Embodiment 3
The technical process of present embodiment as shown in Figure 3.Raw material adopts P
2O
5Content is 28% Sichuan Jin He phosphorus ore.100 parts of weight of ground phosphate rock, 70 parts of moisture, concentration is 70 parts in 98% sulfuric acid, 2 parts in activator nitric acid, all materials add acidolysis reaction devices 1 and carry out acidolysis reaction, about about 100 ℃ of temperature of reaction, about 20 minutes of reaction times.The vitriolic add-on all can 30～70 parts of scopes.The fluorine gas that produces in the acidolysis reaction enters the fluorine withdrawer, form with silicofluoride reclaims fluorine, reacted acidolysis slip enters conversion reactor 2, add 110 parts in urea simultaneously, and add 2 parts of activator lauryl amine Soxylat A 25-7-12 weight parts, the conversion reaction temperature is about about 50 ℃, and the reaction times was about about 45 minutes.The conversion slip that comes out from conversion reactor 2 sprays into the material curtain of being taken up by flight in the tablets press with spray gun and carries out granulation, and the hot blast temperature that enters in the tablets press is about about 180 ℃, and the hot-blast outlet temperature is about about 80 ℃.Contain K by the adding of tablets press head
2O is 40 parts in 60% a Repone K, adds 3 parts of separant and neutralizing agent Paris whites by the tablets press afterbody.The granulated fertilizer of being discharged by the tablets press outlet is finished product MUSPK composite fertilizer after cooling.N-p-k ratio in the composite fertilizer is about about 2: 1: 1.The phosphorus ore transformation efficiency of present embodiment can reach about 90%.
Embodiment 4
The technical process of present embodiment as shown in Figure 4.Raw material still adopts P
2O
5Content is 28% Sichuan Jin He phosphorus ore.The technological process and the processing condition of present embodiment are substantially the same manner as Example 3; different places be in the spray granulating process; do not add sylvite and separant and neutralizing agent Paris white respectively at tablets press head and afterbody; the urine S-based compound fertilizer of producing does not contain the potassium element nutrient, and the granulated fertilizer of being discharged by the tablets press outlet is finished product MUSP composite fertilizer after cooling.
Claims (10)
1, a kind of preparation technical method of urine sulfur radical composite fertilizer is characterized in that comprising the next coming in order processing step:
(1) will add the acidolysis reaction device according to true quantitative sulfuric acid of complex fertilizer product phosphorus sulphur design of components ratio and phosphorus ore, phosphorus ore will be carried out acidolysis reaction, produce the acidolysis slip;
(2) will carry out the urea conversion reaction according to complex fertilizer product nitrogen phosphorus sulphur true quantitative urea of design of components ratio and acidolysis slip adding conversion reactor, and produce urea and transform slip;
(3) carry out product solidification processing to transforming slip, produce urine S-based compound fertilizer product.
2, preparation technical method of urine sulfur radical composite fertilizer according to claim 1, it is characterized in that said urea transforms slip product solidification processing mode and is, the conversion slip that comes out from conversion reactor is introduced into digestion tank and carries out the ageing solidification treatment, becomes urine S-based compound fertilizer product with crusher in crushing again after the curing.
3, preparation technical method of urine sulfur radical composite fertilizer according to claim 2 is characterized in that said urea is transformed the ageing solidification value that slip carries out the ageing solidification treatment is 50～80 ℃, about 15～24 hours of time.
4, preparation technical method of urine sulfur radical composite fertilizer according to claim 1 is characterized in that said conversion slip product solidification processing mode is, the urea that comes out from conversion reactor transforms slip and sprays into tablets press with spray gun and carry out granulation.
5, preparation technical method of urine sulfur radical composite fertilizer according to claim 4 is characterized in that said spray granulating is urea to be transformed slip inject on the material curtain of being taken up by flight in the spray granulating machine with spray gun and carry out granulation.
6, preparation technical method of urine sulfur radical composite fertilizer according to claim 5; it is characterized in that transforming slip at urea sprays into tablets press and carry out in the process of granulation with spray gun, add according to the true quantitative sylvite of complex fertilizer product nitrogen phosphorus sulphur potassium design of components ratio by the head of tablets press.
7, preparation technical method of urine sulfur radical composite fertilizer according to claim 5; it is characterized in that transforming slip at urea sprays into tablets press and carry out in the process of granulation with spray gun, add according to transforming acid true quantitative neutralizing agent of slip and/or separant by the afterbody of tablets press.
8, preparation technical method of urine sulfur radical composite fertilizer according to claim 5 is characterized in that urea transforms slip and sprays into spray gun in the process of carrying out granulation in the tablets press, and the temperature in the tablets press is 150～180 ℃.
9, according to the described preparation technical method of urine sulfur radical composite fertilizer of each claim of claim 1 to 8, it is characterized in that in the acidolysis reaction process and/or urea thiamine conversion reaction process in add activator.
10, preparation technical method of urine sulfur radical composite fertilizer according to claim 9 is characterized in that said activator is selected from nitric acid, hydrochloric acid, KCI, lauryl amine Soxylat A 25-7-12, two methyl alkyl bromo, cationic 12 carbon oil agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710048574A CN100575316C (en) | 2007-03-07 | 2007-03-07 | Preparation technical method of urine sulfur radical composite fertilizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710048574A CN100575316C (en) | 2007-03-07 | 2007-03-07 | Preparation technical method of urine sulfur radical composite fertilizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101041603A true CN101041603A (en) | 2007-09-26 |
| CN100575316C CN100575316C (en) | 2009-12-30 |
Family
ID=38807422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710048574A Expired - Fee Related CN100575316C (en) | 2007-03-07 | 2007-03-07 | Preparation technical method of urine sulfur radical composite fertilizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100575316C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102050642A (en) * | 2009-11-05 | 2011-05-11 | 徐杰 | Method for producing qualified calcium superphosphate fertilizer with low-grade phosphate ore |
| CN103086338A (en) * | 2013-01-31 | 2013-05-08 | 郑州大学 | Method for producing superphosphate and compound fertilizer thereof by means of concentrated acid slag powder method |
| CN104326771A (en) * | 2014-10-22 | 2015-02-04 | 瓮福（集团）有限责任公司 | Method for preparing calcium-magnesium nitrate fertilizer by utilizing phosphate tailings |
| CN110372434A (en) * | 2019-07-04 | 2019-10-25 | 湖北祥云(集团)化工股份有限公司 | A method of nutrient in recycling industrial monoammonium phosphate slag |
| CN113597406A (en) * | 2018-12-21 | 2021-11-02 | 涡龙设备与工艺公司 | Method for recovering phosphorus |
| CN114286807A (en) * | 2019-07-12 | 2022-04-05 | 沙特基础工业全球技术公司 | Phosphoric acid urea calcium sulfate particles and methods of making and using the same |
| US11802096B2 (en) | 2017-07-21 | 2023-10-31 | Sabic Global Technologies B.V. | Calcium sulfate urea granules and methods for producing and using the same |
-
2007
- 2007-03-07 CN CN200710048574A patent/CN100575316C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102050642A (en) * | 2009-11-05 | 2011-05-11 | 徐杰 | Method for producing qualified calcium superphosphate fertilizer with low-grade phosphate ore |
| CN102050642B (en) * | 2009-11-05 | 2013-07-17 | 徐杰 | Method for producing qualified calcium superphosphate fertilizer with low-grade phosphate ore |
| CN103086338A (en) * | 2013-01-31 | 2013-05-08 | 郑州大学 | Method for producing superphosphate and compound fertilizer thereof by means of concentrated acid slag powder method |
| CN104326771A (en) * | 2014-10-22 | 2015-02-04 | 瓮福（集团）有限责任公司 | Method for preparing calcium-magnesium nitrate fertilizer by utilizing phosphate tailings |
| US11802096B2 (en) | 2017-07-21 | 2023-10-31 | Sabic Global Technologies B.V. | Calcium sulfate urea granules and methods for producing and using the same |
| US11912634B2 (en) | 2017-07-21 | 2024-02-27 | Sabic Global Technologies B.V. | Calcium sulfate urea granules and methods for producing and using the same |
| CN113597406A (en) * | 2018-12-21 | 2021-11-02 | 涡龙设备与工艺公司 | Method for recovering phosphorus |
| CN110372434A (en) * | 2019-07-04 | 2019-10-25 | 湖北祥云(集团)化工股份有限公司 | A method of nutrient in recycling industrial monoammonium phosphate slag |
| CN114286807A (en) * | 2019-07-12 | 2022-04-05 | 沙特基础工业全球技术公司 | Phosphoric acid urea calcium sulfate particles and methods of making and using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100575316C (en) | 2009-12-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104355943B (en) | Desulfurized gesso of flue gas is modified alkaline land improving special fertilizer of preparation and preparation method thereof | |
| CN100575316C (en) | Preparation technical method of urine sulfur radical composite fertilizer | |
| CN101519324B (en) | Long-effect compound fertilizer containing sulfur with high nitrogen, production method and application thereof | |
| CN102153392B (en) | Production method of novel slow release urea-formaldehyde compound fertilizer | |
| CN103113139B (en) | Method for producing multivariate nitro compound fertilizer from wet-process phosphoric acid purification sludge | |
| CN104086311A (en) | Special organic/inorganic compound fertilizer for edible amaranth | |
| EP3778535A1 (en) | Polyphosphoric acid calcium magnesium fertilizer, polyphosphoric acid calcium magnesium fertilizer prepared by using phosphoric acid and phosphorus tailings as raw materials and preparation method therefor | |
| CN100509710C (en) | Method for preparing clean urea-sulfuricacid compound-mixed fertilizer | |
| CN102765994A (en) | Method for preparing granular potash fertilizer | |
| CN103936524A (en) | Method for producing urea formaldehyde controlled-release compound fertilizer | |
| RU2478087C2 (en) | Lime-containing nitrogen-sulphur fertiliser and method for production thereof | |
| CN106831053A (en) | A kind of production method of graininess, function intensified type phosphorus containing magnesium ammonium | |
| CN101973791A (en) | Nanometer apatite phosphate fertilizer and preparation method thereof | |
| CN102515924A (en) | Preparation method of chlorine-free compound fertilizer | |
| CN103570410A (en) | Method for one-step-method preparation of nitrogen-phosphorus-potassium composite fertilizer by using potash feldspar | |
| CN1280968A (en) | Process for preparing organic composite N-P-K fertilizer from solidified substance in black paper-making liquid | |
| CN102795910B (en) | Blended fertilizer based on steel production waste and preparation method thereof | |
| CN1292367A (en) | Production method of granular nitrogen-phosphorus composite fertilizer containing secondary element | |
| CN101973811B (en) | Multielement compound fertilizer | |
| CN105087014A (en) | Saline-alkali soil improver prepared from ardealite and rectorite, as well as preparation method and application of saline-alkali soil improver | |
| CN102276355A (en) | Potassium sulfate type compound fertilizer produced by treating weathered coal by ammoniation method and preparation method thereof | |
| CN104355681A (en) | Method for producing triple superphosphate by employing fertilizer-grade dicalcium phosphate as raw material | |
| CN103588543A (en) | Production method for multi-nutrient urea sulfuric acid sulfur-based composite fertilizer | |
| CN1521151A (en) | Slow release high efficiency compound fertilizer of thio urea phosphor ammonium kalium and its preparing technology | |
| CN103030479A (en) | Controlled availability special BB fertilizer for cotton and preparation thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091230 Termination date: 20170307 |