CN104229764A - Method for continuously producing water-soluble monoammonium phosphate by using wet-process phosphoric acid - Google Patents
Method for continuously producing water-soluble monoammonium phosphate by using wet-process phosphoric acid Download PDFInfo
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Abstract
The invention discloses a method for continuously producing water-soluble monoammonium phosphate by using wet-process phosphoric acid. The method comprises the following steps: adding phosphoric ore pulp to wet-process dilute phosphoric acid; after natural sedimentation, carrying out neutralization reaction between clear desulfurated dilute phosphoric acid at the top and ammonia gas, wherein the neutralization degree of slurry is 0.95-1.05; carrying out natural sedimentation of the neutralized slurry in a settlement trough; filtering ammonium phosphate supernatant in a filter; concentrating and drying the obtained supernatant, so as to prepare the water-soluble monoammonium phosphate, wherein a filter cake and filter residue which are obtained after filtering can be used for preparing an agricultural compound fertilizer. According to the method, the problem of a traditional method that corresponding impurity removal depth can be reached by means of improving the neutralization degree of the slurry and carrying out neutralization reaction many times is avoided, neutralization reaction is carried out only once, and operation is facilitated. Meanwhile, the production efficiency is also improved, the obtained water-soluble monoammonium phosphate is good in quality, and the content of insoluble matter is low. In addition, the method is short in technological process and relatively simple in production control and can be put into continuous production easily.
Description
Technical field
The invention belongs to monoammonium phosphate production technical field, specifically relate to a kind of method being raw material continuous seepage water-soluble phosphoric acid one ammonium with two water wet method dilute phosphoric acids.
Background technology
Monoammonium phosphate is a kind of important phosphorus chemical product, mainly contains agricultural grade and technical grade.In recent years, the feature of water soluble fertilizer and high utilization rate quick-acting with it, obtains extensive accreditation.But because agricultural grade monoammonium phosphate is water-soluble poor, water insoluble matter content is high, can not meet the service requirements of water soluble fertilizer.At present, be generally use as water-soluble phosphoric acid one ammonium using industrial grade monoammonium phosphate, but industrial grade monoammonium phosphate production cost is high, limits popularization and the use of water-soluble phosphoric acid one ammonium.
The production of industrial grade monoammonium phosphate mainly contains two kinds of techniques: one is thermal phosphoric acid technique, and this method Production Flow Chart is simple, but production cost is high.Another kind is Wet Processes of Phosphoric Acid, and phosphoric acid is raw material in a wet process, and by ammonification removal of impurities manufacture level monoammonium phosphate, comparatively thermal phosphoric acid technique, Wet Processes of Phosphoric Acid production cost is lower, and this is also the researchdevelopment direction of water-soluble phosphoric acid one ammonium.
At present, about adopting, the research of preparing industrial grade monoammonium phosphate from wet-process phosphoric acid report is more, as Chinese patent 200810196872.4 discloses " phosphoric acid by wet process continuous processing manufacture level monoammonium phosphate technique ".This method carries out desulfurization with phosphate ore pulp to phosphoric acid by wet process, through settlement separate that supernatant liquid is desulfurization phosphoric acid, in desulfurization phosphoric acid, pass into ammonia carry out first time neutralization reaction, in and slip in settlement separate and slip clear liquor, to in and continue to pass into ammonia and carry out second time neutralization reaction in slip clear liquor, control pH is 5.2 ~ 5.8, adjust Two-step neutralization slip is counter with desulfurization phosphoric acid again, 4.4 ~ 4.6 are adjusted to by counter for slip pH, carrying out a press filtration, secondary press filtration is carried out after gained concentrating filter liquor, secondary press filtration gained filtrate is carried out crystallisation by cooling, be separated, dry obtained industrial grade monoammonium phosphate product.The subject matter that this method exists is that technical process is complicated, and whole technological process need carry out Two-step neutralization reaction, and twice sedimentation, twice press filtration, technical process is longer, and throughput is lower, and labour intensity is larger.
Chinese patent 201010552501.2 discloses " method of Wet-process Phosphoric Acid Production industry, agriculture level monoammonium phosphate and magnesium ammonium phosphate ".This method in phosphoric acid by wet process, adds sodium salt carry out defluorinate, after filtering, in phosphoric acid defluorination, pass into ammonia carry out first time neutralization reaction, control pH is 4.5 ~ 5.0, obtain monoammonium phosphate filtrate after filtration, in gained filtrate, continue to pass into ammonia carry out second time neutralization reaction, control pH is 5.8 ~ 6.0, filter through second time again, gained filtrate is adjusted with phosphoric acid defluorination is counter again, control pH is 4.5 ~ 5.0, gained monoammonium phosphate concentrating filter liquor, crystallisation by cooling, separation, dry obtained industrial grade monoammonium phosphate product.The subject matter that this method exists is that technical process is longer, and whole technological process need carry out three neutralization reactions, and three filtering separation, throughput is lower, and labour intensity is larger.
Chinese patent 201110256462.8 discloses " method of direct production of industrial-grade ammonium biphosphate by wet-process phosphoric acid ".This method in phosphoric acid by wet process, passes into ammonia carry out neutralization reaction, controlling slip pH is 8 ~ 9, after filtration, be 7 by counter for the gained filtrate industrial phosphoric acid pH value of solution that is adjusted to, drip ammonium sulfide again and lead nitrate reacts, filtering through second time, is 4 ~ 5 by counter for the secondary filtrate industrial phosphoric acid pH value of solution that is adjusted to again, and carries out concentrating, crystallisation by cooling, dry obtained industrial grade monoammonium phosphate product.The subject matter that this method exists is that technical process is complicated, and ammonification degree of neutralization is high, need adjust with a large amount of PHOSPHORIC ACID TECH.GRADE is counter, production cost is higher, and ammonia loss is comparatively large, and operating environment is poor, whole technological process need be carried out three times and be filtered, and throughput is lower, and labour intensity is larger.
Chinese patent 201010191938.8 discloses " method with preparing industrial grade monoammonium phosphate from wet-process phosphoric acid ".This method adds phosphoric acid by wet process in crystalline mother solution, it is 4.4 ~ 4.6 that logical ammonia is neutralized to pH, simultaneously reclaim ammonia through pickling process, in and slip after filtration, gained monoammonium phosphate concentrating filter liquor, crystallisation by cooling, separation, dry obtained industrial grade monoammonium phosphate product.The subject matter that this method exists is that the removal of impurities degree of depth is lower, and gained monoammonium phosphate filtrate foreign matter content is high, monoammonium phosphate product inferior quality.
Chinese patent 201210575796.4 discloses " method with preparing industrial grade monoammonium phosphate from wet-process phosphoric acid coproduction PHOSPHORIC ACID TECH.GRADE two ammonium ".This method in phosphoric acid by wet process, adds secondary calcium phosphate carry out desulphurization reaction, then once filter, filtrate and ammonia carry out neutralization reaction, obtain phosphor ammonium slurry, again with ammonium sulfide and phosphor ammonium slurry reaction, carry out secondary filtration, concentrating filter liquor, crystallization, separation, drying obtain industrial grade monoammonium phosphate product.The subject matter that this method exists adopts secondary calcium phosphate desulfurization, and production cost is higher, and whole technical process is longer, and need carry out twice filtration, throughput is lower.
Chinese patent 201010114114.0 discloses " a kind of production technique of industrial grade monoammonium phosphate ".This method adds wet method dilute phosphoric acid in monoammonium phosphate crystalline mother solution, then desulfurization is carried out by stoichiometric 45% ~ 85% interpolation ground phosphate rock of sulfate radical or calcium carbonate, after filtration, in gained filtrate, pass into ammonia carry out neutralization reaction, to in and filter after adding sinking agent in slip, concentrating filter liquor, crystallisation by cooling, separation, dry obtained industrial grade monoammonium phosphate product.The subject matter that this method exists adopts interpolation sinking agent with slip in being, increases production cost, and the polluted product of sinking agent meeting simultaneously, throughput is lower, is difficult to realize continuous prodution.
Chinese patent 92108090.5 discloses " a kind of production method of PHOSPHORIC ACID TECH.GRADE ammonium ".This method be with in ammonia and phosphoric acid by wet process to degree of neutralization be 1.06 ~ 1.13, the sedimentation in subsider of gained phosphor ammonium slurry, control clear liquid face below lift velocity 10mm/min, fertilizer grade monoammonium phosphate is prepared by the settlement separate slurry obtained, being concentrated into moisture by the settlement separate clear liquid obtained is 40% ~ 45%, through crystallisation by cooling, centrifugation, washing, dry obtained industrial grade monoammonium phosphate product.The subject matter that this method exists is that phosphoric acid by wet process ammonification slip adopts sedimentation to be separated, but be not more than 10mm/min by regulating charging and plasma discharge flow control clear liquid liquid level lift velocity, gained clear liquid quality not easily ensures, and then affects monoammonium phosphate product quality, and production control difficulty is larger.
Chinese patent 201210329385.7 discloses " method with Wet-process Phosphoric Acid Production monoammonium phosphate coproduction N-P binary compound fertilizer ".This method is that wet method dilute phosphoric acid is concentrated into 46% ~ 48%P
2o
5, after sedimentation, with process water, clarification gelled acid is diluted to 20 ~ 25%P
2o
5, it is 1.01 ~ 1.04 that logical ammonia is neutralized to degree of neutralization, through natural clarification, adding in diluted acid in supernatant liquid and adjusting pH is 4.4 ~ 4.6, enter post-defecation groove again to clarify, post-defecation liquid be concentrated through two-stage, crystallisation by cooling, to be separated, dry obtained industrial grade monoammonium phosphate product.The subject matter that this method exists is wet method dilute phosphoric acid first concentrated thin up again, after concentrated phosphorus ammonium feed liquid again, whole process energy loss is very large, and energy expenditure is high; In addition, this technique need through twice neutralization reaction, naturally clarify for twice, naturally bottom slag liquid is clarified for twice again through twice press filtration, whole technical process is complicated, and post-defecation liquid directly concentrates, and its clear liquor quality not easily ensures, and then easily affecting monoammonium phosphate product quality, production operation difficulty is larger.
Chinese patent 201310396218.9 discloses " method of the complete water-soluble monoammonium phosphate of Wet-process Phosphoric Acid Production ", this method is by phosphoric acid by wet process and ammonia neutralization reaction, by in and slip carry out solid-liquor separation, removing solid phase slag, collection filtrate is also concentrated, and the monoammonium phosphate slip drying after concentrated is obtained full water-soluble monoammonium phosphate, wherein relate to by and slip through natural subsidence, supernatant liquid sends into concentration systems, and the thick slurry in bottom is after press filtration, and filtrate is sent to concentration systems together with supernatant liquid.The subject matter that this method exists only adopts natural subsidence to be separated with slip in being, gained supernatant liquid quality is comparatively difficult to ensure card, in production reality, operation easier is larger, wayward, once bad with slip effect of settling in occurring, be easy to affect monoammonium phosphate product quality, cause quality product defective.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, a kind of method of phosphoric acid by wet process continuous seepage water-soluble phosphoric acid one ammonium is provided, relative to the production technique that prior art is concrete easier, and significantly can promote the quality of water-soluble phosphoric acid one ammonium.
The object of the invention is achieved by the following technical programs.
Except as otherwise noted, percentage ratio of the present invention is mass percent.
A method for phosphoric acid by wet process continuous seepage water-soluble phosphoric acid one ammonium, comprises the following steps:
(1) in wet method dilute phosphoric acid, add phosphate ore pulp, after natural subsidence, upper clear supernate is clarification desulfurization dilute phosphoric acid, and slag slurry in bottom is sent to phosphoric acid by wet process extracting system;
(2) gained clarification desulfurization dilute phosphoric acid and ammonia carry out neutralization reaction, and slip degree of neutralization is 0.95 ~ 1.05;
(3) in subsider, carry out natural subsidence with slip in step (2) gained, upper strata is the phosphorus ammonium clear liquid that solid content is lower, and bottom is the phosphorus ammonium slag slurry that solid content is higher;
(4) gained upper strata phosphorus ammonium clear liquid in step (3) is sent into filter to filter, gained clear liquid is again through concentrated, dry obtained water-soluble phosphoric acid one ammonium.
In step (2), the concentration of clarification desulfurization dilute phosphoric acid is 18 ~ 26%P
2o
5.
In step (2), the concentration of clarification desulfurization dilute phosphoric acid is preferably 20 ~ 24%P
2o
5.
In step (2), slip degree of neutralization is preferably 0.98 ~ 1.03.
Phosphorus ammonium clear liquid after filtration described in step (4) is through concentrated, crystallization, separation, dry obtained crystal type water-soluble phosphoric acid one ammonium product.
Phosphorus ammonium slag in step (3) is starched gained filter cake after filtering and, for the production of agricultural type composite fertilizer, is filtered gained clear liquid together with clear liquid after step (4) gained filters for the production of water-soluble phosphoric acid one ammonium product.
Filter in step (4) gained filter cake and the middle phosphorus ammonium slag of step (3) starch after filtering together with gained filter cake for the production of agricultural type composite fertilizer.
Compared with prior art, its advantage is in the present invention:
(1) this method by adding phosphate ore pulp in two water wet method dilute phosphoric acids, after natural subsidence, obtain clarification desulfurization dilute phosphoric acid, can require according to quality product the add-on regulating phosphate ore pulp, production operation is simple, be conducive to the stable of raw material acid quality, be conducive to ensureing quality product.
(2) this method slip degree of neutralization is 0.95 ~ 1.05, it is the degree of neutralization that monoammonium phosphate controls, avoid Traditional Method by improving slip degree of neutralization, and the method etc. of repeatedly neutralization reaction just can reach the corresponding removal of impurities degree of depth, production control is simple, be only a neutralization reaction, convenient operation, also improves production efficiency simultaneously.
(3) one-level natural subsidence is adopted with slip in this method, cascade filtration technique, increase substantially the separation efficiency of phosphor ammonium slurry, in turn ensure that the quality of gained phosphorus ammonium clear liquid simultaneously, solve traditional filtering technique, low, the phosphorus ammonium clear liquid quality of separation efficiency that traditional natural sedimentation process exists comparatively is difficult to ensure the problems such as card.
(4) this method gained water-soluble phosphoric acid one ammonium superior product quality, water insoluble matter content is low, and in addition, this method technical process is short, and production control is comparatively simple, is easy to realize continuous prodution.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail, but drawings and Examples are not limited to the technical solution.
Embodiment 1:
Get 1500.0g wet method dilute phosphoric acid, by sulfate radical stoichiometric 20%, add phosphate ore pulp and react, after naturally clarifying, to being adjusted to 26%P
2o
5pass into ammonia in clarification desulfurization dilute phosphoric acid and carry out neutralization reaction, being neutralized to slip degree of neutralization is 0.95, in and slip after natural subsidence, gained supernatant liquid after filtration, concentrating filter liquor, dry obtained water-soluble phosphoric acid one ammonium product.Gained water-soluble phosphoric acid one ammonium analysis indexes is: effectively P
2o
5%=54.27, water-soluble P
2o
5%=53.58, N%=11.76, water-insoluble %=0.43, H
2o%=1.20, pH=4.32.
Embodiment 2:
Get 1500.0g wet method dilute phosphoric acid, by sulfate radical stoichiometric 50%, add phosphate ore pulp and react, after naturally clarifying, to being adjusted to 26%P
2o
5pass into ammonia in clarification desulfurization dilute phosphoric acid and carry out neutralization reaction, being neutralized to slip degree of neutralization is 1.00, in and slip after natural subsidence, gained supernatant liquid after filtration, concentrating filter liquor, dry obtained water-soluble phosphoric acid one ammonium product.Gained monoammonium phosphate analysis indexes is: effectively P
2o
5%=54.78, water-soluble P
2o
5%=54.38, N%=12.34, water-insoluble %=0.21, H
2o%=0.50, pH=4.43.
Embodiment 3:
Get 1500.0g wet method dilute phosphoric acid, by sulfate radical stoichiometric 100%, add phosphate ore pulp and react, after naturally clarifying, to being adjusted to 24%P
2o
5pass into ammonia in clarification desulfurization dilute phosphoric acid and carry out neutralization reaction, being neutralized to slip degree of neutralization is 1.02, in and slip after natural subsidence, gained supernatant liquid after filtration, concentrating filter liquor, dry obtained water-soluble phosphoric acid one ammonium product.Gained water-soluble phosphoric acid one ammonium analysis indexes is: effectively P
2o
5%=56.69, water-soluble P
2o
5%=56.12, N%=11.85, water-insoluble %=0.17, H
2o%=1.27, pH=4.53.
Embodiment 4:
Get 1500.0g wet method dilute phosphoric acid, by sulfate radical stoichiometric 125%, add phosphate ore pulp and react, after naturally clarifying, to being adjusted to 22%P
2o
5pass into ammonia in clarification desulfurization dilute phosphoric acid and carry out neutralization reaction, being neutralized to slip degree of neutralization is 1.05, in and slip after natural subsidence, gained supernatant liquid after filtration, concentrating filter liquor, dry obtained water-soluble phosphoric acid one ammonium product.Gained water-soluble phosphoric acid one ammonium analysis indexes is: effectively P
2o
5%=56.52, water-soluble P
2o
5%=56.32, N%=12.03, water-insoluble %=0.12, H
2o%=1.47, pH=4.55.
Embodiment 5:
Get 1500.0g wet method dilute phosphoric acid, by sulfate radical stoichiometric 150%, add phosphate ore pulp and react, after naturally clarifying, to being adjusted to 20%P
2o
5pass into ammonia in clarification desulfurization dilute phosphoric acid and carry out neutralization reaction, being neutralized to slip degree of neutralization is 1.02, in and slip after natural subsidence, gained supernatant liquid after filtration, concentrating filter liquor, dry obtained monoammonium phosphate product.Gained monoammonium phosphate analysis indexes is: effectively P
2o
5%=57.22, water-soluble P
2o
5%=57.02, N%=12.23, water-insoluble %=0.15, H
2o%=1.26, pH=4.46.
Embodiment 6:
Get 1500.0g wet method dilute phosphoric acid, by sulfate radical stoichiometric 100%, add phosphate ore pulp and react, after naturally clarifying, to being adjusted to 22%P
2o
5pass into ammonia in clarification desulfurization dilute phosphoric acid and carry out neutralization reaction, being neutralized to slip degree of neutralization is 1.02, in and slip after natural subsidence, gained supernatant liquid after filtration, concentrating filter liquor, crystallisation by cooling, separation, dry obtained crystal type water-soluble phosphoric acid one ammonium product.Gained water-soluble phosphoric acid one ammonium analysis indexes is: effectively P
2o
5%=60.53, water-soluble P
2o
5%=60.13, N%=11.80, water-insoluble %=0.08, H
2o%=0.50, pH=4.57.
Embodiment 7:
Get 1500.0g wet method dilute phosphoric acid, by sulfate radical stoichiometric 100%, add phosphate ore pulp and react, after naturally clarifying, to being adjusted to 20%P
2o
5pass into ammonia in clarification desulfurization dilute phosphoric acid and carry out neutralization reaction, being neutralized to slip degree of neutralization is 1.02, in and slip after natural subsidence, gained supernatant liquid and bottom phosphoric acid slag slurry respectively through filter, gained concentrating filter liquor, dry obtained monoammonium phosphate product.Gained monoammonium phosphate analysis indexes is: effectively P
2o
5%=56.86, water-soluble P
2o
5%=56.34, N%=12.20, water-insoluble %=0.22, H
2o%=0.52, pH=4.53.
Claims (7)
1., by a method for phosphoric acid by wet process continuous seepage water-soluble phosphoric acid one ammonium, comprise the following steps:
(1) in wet method dilute phosphoric acid, add phosphate ore pulp, after natural subsidence, upper clear supernate is clarification desulfurization dilute phosphoric acid, and slag slurry in bottom is sent to phosphoric acid by wet process extracting system;
(2) gained clarification desulfurization dilute phosphoric acid and ammonia carry out neutralization reaction, and slip degree of neutralization is 0.95 ~ 1.05;
(3) in subsider, carry out natural subsidence with slip in step (2) gained, upper strata is the phosphorus ammonium clear liquid that solid content is lower, and bottom is the phosphorus ammonium slag slurry that solid content is higher;
(4) gained upper strata phosphorus ammonium clear liquid in step (3) is sent into filter to filter, gained clear liquid is again through concentrated, dry obtained water-soluble phosphoric acid one ammonium.
2. the method for phosphoric acid by wet process continuous seepage water-soluble phosphoric acid one ammonium according to claim 1, is characterized in that: in step (2), the concentration of clarification desulfurization dilute phosphoric acid is 18 ~ 26%P
2o
5.
3. the method for phosphoric acid by wet process continuous seepage water-soluble phosphoric acid one ammonium according to claim 2, is characterized in that: in step (2), the concentration of clarification desulfurization dilute phosphoric acid is preferably 20 ~ 24%P
2o
5.
4. the method for phosphoric acid by wet process continuous seepage water-soluble phosphoric acid one ammonium according to claim 1, is characterized in that: in step (2), slip degree of neutralization is preferably 0.98 ~ 1.03.
5. the method for phosphoric acid by wet process continuous seepage water-soluble phosphoric acid one ammonium according to claim 1, is characterized in that: the phosphorus ammonium clear liquid after the filtration described in step (4) is through concentrated, crystallization, separation, dry obtained crystal type water-soluble phosphoric acid one ammonium product.
6. the method for phosphoric acid by wet process continuous seepage water-soluble phosphoric acid one ammonium according to claim 1, it is characterized in that: the phosphorus ammonium slag in step (3) is starched gained filter cake after filtering and, for the production of agricultural type composite fertilizer, filtered gained clear liquid together with clear liquid after step (4) gained filters for the production of water-soluble phosphoric acid one ammonium product.
7. the method for phosphoric acid by wet process continuous seepage water-soluble phosphoric acid one ammonium according to claim 1, is characterized in that: filter in step (4) gained filter cake and the middle phosphorus ammonium slag of step (3) starch after filtering together with gained filter cake for the production of agricultural type composite fertilizer.
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Cited By (10)
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| CN106278390A (en) * | 2016-07-19 | 2017-01-04 | 中化化肥有限公司成都研发中心 | A kind of phosphoric acid by wet process acid sludge comprehensive reutilization method |
| CN106278458A (en) * | 2016-08-08 | 2017-01-04 | 山西广宇通科技股份有限公司 | A kind of preparation method containing humic acids MAP |
| CN106672932A (en) * | 2017-01-10 | 2017-05-17 | 龙蟒大地农业有限公司 | Method for producing monoammonium phosphate by utilizing magnesium-free mother solution |
| CN107140616A (en) * | 2017-06-28 | 2017-09-08 | 四川省高宇化工有限公司 | The method and device of Wet-process Phosphoric Acid Production potassium dihydrogen phosphate |
| CN107161966A (en) * | 2017-06-28 | 2017-09-15 | 四川省高宇化工有限公司 | The method and device of Wet-process Phosphoric Acid Production Diammonium phosphate (DAP) |
| CN110937585A (en) * | 2019-12-16 | 2020-03-31 | 瓮福达州化工有限责任公司 | Production method of industrial-grade monoammonium phosphate |
| CN111533099A (en) * | 2020-05-22 | 2020-08-14 | 四川大学 | Production method of water-soluble monoammonium phosphate |
| CN112320777A (en) * | 2020-11-16 | 2021-02-05 | 贵州开磷集团矿肥有限责任公司 | Production method of 66% powdered MAP |
| CN112678789A (en) * | 2020-12-29 | 2021-04-20 | 四川龙蟒磷化工有限公司 | Method for preparing monopotassium phosphate by using monoammonium phosphate clear liquid |
| CN114735668A (en) * | 2022-04-01 | 2022-07-12 | 贵州开磷集团股份有限公司 | Production method of fire-fighting-grade monoammonium phosphate |
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| CN106278390A (en) * | 2016-07-19 | 2017-01-04 | 中化化肥有限公司成都研发中心 | A kind of phosphoric acid by wet process acid sludge comprehensive reutilization method |
| CN106278458A (en) * | 2016-08-08 | 2017-01-04 | 山西广宇通科技股份有限公司 | A kind of preparation method containing humic acids MAP |
| CN106672932A (en) * | 2017-01-10 | 2017-05-17 | 龙蟒大地农业有限公司 | Method for producing monoammonium phosphate by utilizing magnesium-free mother solution |
| CN107161966B (en) * | 2017-06-28 | 2019-01-29 | 四川省高宇化工有限公司 | The method and device of Wet-process Phosphoric Acid Production Diammonium phosphate (DAP) |
| CN107161966A (en) * | 2017-06-28 | 2017-09-15 | 四川省高宇化工有限公司 | The method and device of Wet-process Phosphoric Acid Production Diammonium phosphate (DAP) |
| CN107140616B (en) * | 2017-06-28 | 2019-01-29 | 四川省高宇化工有限公司 | The method and device of Wet-process Phosphoric Acid Production potassium dihydrogen phosphate |
| CN107140616A (en) * | 2017-06-28 | 2017-09-08 | 四川省高宇化工有限公司 | The method and device of Wet-process Phosphoric Acid Production potassium dihydrogen phosphate |
| CN110937585A (en) * | 2019-12-16 | 2020-03-31 | 瓮福达州化工有限责任公司 | Production method of industrial-grade monoammonium phosphate |
| CN110937585B (en) * | 2019-12-16 | 2023-03-10 | 瓮福达州化工有限责任公司 | Production method of industrial-grade monoammonium phosphate |
| CN111533099A (en) * | 2020-05-22 | 2020-08-14 | 四川大学 | Production method of water-soluble monoammonium phosphate |
| CN111533099B (en) * | 2020-05-22 | 2021-12-07 | 四川大学 | Production method of water-soluble monoammonium phosphate |
| CN112320777A (en) * | 2020-11-16 | 2021-02-05 | 贵州开磷集团矿肥有限责任公司 | Production method of 66% powdered MAP |
| CN112678789A (en) * | 2020-12-29 | 2021-04-20 | 四川龙蟒磷化工有限公司 | Method for preparing monopotassium phosphate by using monoammonium phosphate clear liquid |
| CN114735668A (en) * | 2022-04-01 | 2022-07-12 | 贵州开磷集团股份有限公司 | Production method of fire-fighting-grade monoammonium phosphate |
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Application publication date: 20141224 |