CN106672931A - Method and equipment for producing polyphosphoric acid with wet process phosphoric acid - Google Patents
Method and equipment for producing polyphosphoric acid with wet process phosphoric acid Download PDFInfo
- Publication number
- CN106672931A CN106672931A CN201710101146.9A CN201710101146A CN106672931A CN 106672931 A CN106672931 A CN 106672931A CN 201710101146 A CN201710101146 A CN 201710101146A CN 106672931 A CN106672931 A CN 106672931A
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- phosphoric acid
- reverberatory furnace
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- wet
- oligomeric
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/24—Condensed phosphoric acids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/162—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel
- F27D2003/165—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel the fluid being a fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/168—Introducing a fluid jet or current into the charge through a lance
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention belongs to the technical field of phosphoric acid production in the inorganic chemical industry, and relates to a novel production method and equipment for producing polyphosphoric acid with wet process phosphoric acid. According to the method, a reverberatory furnace is mainly adopted innovatively, the equipment such as a burner nozzle, a polyphosphoric acid tank, a low polyphosphoric acid circulating pump, a fume extractor, a filler washing tower and a plurality of control valves is additionally arranged, and the wet process phosphoric acid is used as a raw material for concentrated polymerization production of the polyphosphoric acid. The reaction equipment is reliable and stable, and easy and convenient to operate and control, and solves the problem that scales easily deposit on tubes of a tubular heat exchanger in single-stage or multi-stage evaporation of the wet process phosphoric acid and are stubborn at home and abroad at present. Temperature control is moderate, and the phenomenon that a large number of acid particles are carried away due to local overheating and excessively high temperatures is avoided. No vacuum mode is required, and energy is saved. Two-stage product output is adopted, thereby facilitating the improvement on the production efficiency. Tail gas is recycled by a cleaning solution which then is used as a raw material, the product yield is increased, exhaust emission is reduced, and the environmental protection is facilitated.
Description
Technical field
The invention belongs to the phosphoric acid production technical field in inorganic chemistry industry, it is related to one kind by Wet-process Phosphoric Acid Production poly
The method and apparatus of phosphoric acid.
Background technology
Polyphosphoric acids is a fine phosphorus chemical product, and its Main Ingredients and Appearance is orthophosphoric acid, pyrophosphoric acid, tripolyphosphate, four gathers
Phosphoric acid and polyphosphoric acid high are constituted.Molecular formula：H(n+2)PnO(3n+1)；
Structural formula：
Typical products molecular formula：H6P4O13.Polyphosphoric acids folding phosphoric acid amount is generally 105~115%H3PO4.Polyphosphoric acids
There is relatively low viscosity and freezing point, corrosivity is smaller, has good chelation to metal ion, is mainly used in petrochemistry
Condensation catalyst, dehydrating agent, metal conditioner, analytical reagent, pharmaceuticals, the cyclizing agent of organic synthesis and acidulant, system
Make substitute of high-concentration liquid fertilizer, phosphate industry raw material and phosphoric acid etc..
At present, carry out polyphosphoric acids technology research country be not a lot, mainly have the U.S., Russia, Japan and
Some countries in Europe.The preparation method of polyphosphoric acids, study both at home and abroad, report it is relatively fewer, it is main as follows：
1. thermal phosphoric acid polymerization, is the P for obtaining yellow phosphorus burning2O5, cooled down with phosphoric acid and absorbing polymer, cost
It is higher.
2. synthetic method, be by thermal phosphoric acid and phosphorus pentoxide heating polymerization, drawback be will in production thermal phosphoric acid and
Carry out on the basis of P2O5, therefore production cost is slow compared with high, reaction, yield is few.
3. electric energy method, is that electric current flows between the electrodes on the electrode being placed in the container equipped with acid by electro ultrafiltration
Dynamic and Transient transformation makes acid boiling produce vapor and other volatile materials that there may be in phosphoric acid into heat.The U.S.
Scholar has done numerous studies in this respect, and according to United States Patent (USP) 2839408, phosphoric acid can be by being placed on direct current therein
Pole electrolytic enrichment, and hydrogen and oxygen are produced, have the disadvantage that the hydrogen for producing and oxygen can not be separated well, it is very easy to quick-fried
It is fried, can not yet industrialize.United States Patent (USP) 3044851 is mentioned, during concentrated phosphoric acid is produced with different heating technology, inventor
The usage of electric arc furnaces is described, electrode is placed in sour body and connects one alternating current, and electric arc is drawn between electrode and acid
Stretch, heat is generated heat by electric arc and produced, but high temperature can cause the ablated and sour hot-spot phenomenon of electrode, cause sediment shape
Into while the position of electrode is difficult to control, therefore also there are no the report of commercial Application.
4. phosphoric acid by wet process polymerization, by wet phosphoric acid purifying, special heating polymerization again, more is that hot gas is passed through into tubulation
In heat exchanger, single-stage or multistage evaporation, make acid concentration polymerization under vacuumized conditions.This method often need by wet phosphoric acid purifying,
Increase cost.
5. high-temperature heating concentration method, external in addition to using the above method 4, is also exactly that the heat smoke of high temperature is passed through in acid
Being fully contacted makes acid concentration polymerization.United States Patent (USP) 6616906, in the stove of a generator or immersion produce 1000 DEG C or
The hot gas of person's higher temperature, hot gas is fully contacted with acid and concentrates it in being imported into a generator.This method exists a lot
Shortcoming, such as：When hot air temperature is too high, can carry substantial amounts of sour particulate needs treatment, and these particulates easily form aerosol；
It is difficult to be collected in practical operation, causes the loss of acid, equipment corrosion serious and atmosphere pollution.Simultaneously because wanting 1000 DEG C
Heat smoke, therefore high energy consumption, and easily there is hot-spot phenomenon in acid, sediment is easily formed in generator under the high temperature conditions,
The operation steady in a long-term of generator is influenceed, can not yet be industrialized.
The industrial process of above-mentioned polyphosphoric acids, latter two is wet process acid concentration polymerization.The concentration of generally acid is not
Carried out in the cold boiler of same type, due to high temperature and heat transfer inhomogeneities, acid can produce local mistake unavoidably in concentration process
Heat, makes heating vessel surface precipitation fouling occur.Therefore from the eighties of last century twenties to today, domestic and foreign scholars are always to such as
What the effective, concentration of the raising phosphoric acid of low energy consumption is studied.The present invention is precisely in order to solve above-mentioned many by Wet-process Phosphoric Acid Production
Difficult purification present in polyphosphoric acid process, high energy consumption, temperature high, easy overheat, easily precipitate, the problems such as equipment is perishable, and invent
Using reverberatory furnace come for Wet-process Phosphoric Acid Production polyphosphoric acids.
The content of the invention
In order to solve at present difficult purification, high energy consumption, temperature present in Wet-process Phosphoric Acid Production polyphosphoric acids process both at home and abroad
Degree is high, easily overheat, easily precipitation, the problems such as equipment is perishable, phosphoric acid by wet process is made polyphosphoric acids by special invention using reverberatory furnace.
The technical proposal of the invention is realized in this way：
A kind of method and apparatus by Wet-process Phosphoric Acid Production polyphosphoric acids, is primarily characterized in that, including pipeline connects successively
The burner that connects, reverberatory furnace, polyphosphoric acids groove, oligomeric phosphorus acid tank, oligomeric phosphoric acid circulating pump, smoking blower fan, stuffing washing tower, wash
Wash liquid circulating pump, shower nozzle, chimney, multiple control valves.
Its main technological steps implemented includes：
The first step, liquefied gas passes through an end burning of the burner in reverberatory furnace, there is provided needed for wet-process phosphoric acid concentration, polymerization
The heat energy wanted；
Second step, raw material phosphoric acid,diluted enters reverberatory furnace from the other end opposite with burner end through in-let dimple valve, and
One end where flowing to burner, is heated up rapidly in the reverberatory furnace of high temperature in flow process, is concentrated, is polymerized, preliminary poly-
The reflected stove primary outlet control valve outflow of oligomeric phosphoric acid of conjunction, collects through oligomeric phosphorus acid tank, and oligomeric phosphorus acid tank is equipped with low
Polyphosphoric acid circulating pump, reverberatory furnace is pumped into by the oligomeric phosphoric acid of collection through pump intake control valve and control of export valve, is followed with profit
Ring concentration, polymerization；
3rd step, according to the actual requirements, oligomeric phosphoric acid inside oligomeric phosphorus acid tank is flowed out by control valve, can be as
A kind of product is directly packed；
4th step, other oligomeric phosphoric acids not from the outflow of primary outlet control valve continue to burner in reverberatory furnace
One end flowing at place, and further concentrate, be polymerized, then second control of export valve outflow of reflected stove, through poly phosphorus
Acid tank is collected, then is flowed out by control valve, is then directly packed as major product；
5th step, vaporizes produced water vapour and is formed together with a small amount of phosphoric acid steam of flue gas and entrained with reverberatory furnace
Tail gas is pumped into stuffing washing tower through smoking blower fan, and padding washing tower bottom is furnished with detergent circulator, and circulating cleaning solution is through entrance
Control valve and control of export valve pump into shower nozzle, to spray into stuffing washing tower, absorb a small amount of phosphoric acid steam in tail gas, reclaim
Tail gas after treatment is emptied through chimney, for cyclic absorption tail gas cleaning solution reach finite concentration after, by control valve stream
Enter the concentration of conduct supplement raw material, polymerization in reverberatory furnace, water is supplemented to keep zone of reasonableness to stuffing washing tower by control valve
Liquid level.
Raw material of the present invention is phosphoric acid by wet process of the concentration 25% to 60%, and products obtained therefrom is international to reach
The polyphosphoric acids of 95% to the 105% of standard；Described reverberatory furnace temperature control is arrived at 500 to 900 degrees Celsius, preferably 700
800 degrees Celsius；Described reverberatory furnace inner lining material can be by high temp glass, refractory brick, dolomite, quartz sand, graphite, magnesite
It is made Deng corrosion-and high-temp-resistant material, reverberatory furnace shape can be square, trapezoidal, semicircle top.
Compared with original technology, advantage is the present invention：
(1) do that main consersion unit is reliable and stable with reverberatory furnace, operational control simple and convenient completely solves the present country
The intractable problem of the easy incrustation of the tubulation of tubular heat exchanger in outer single-stage or multistage evaporation；
(2) reflection furnace temperature is integrally preferably controlled within 700 to 800 degrees Celsius, is that cold acid enters an integral high-temperature
Gas, liquid, solid environment, it is more easy to control to concentrate polymerization in acid than being imported using the heat smoke of celsius temperature more than 1000, it is to avoid
Hot-spot, it is to avoid hot air temperature carries away substantial amounts of sour particulate when too high；
(3) temperature control of the present invention is moderate, is not required to use vacuum, saves energy；
(4) product quality stabilization of the present invention, is not in overheat poly- problem high, using two-step product output, is both easy to
Meet actual demand, improve production efficiency is easy to again；
(5) after cleaning solution circulation and stress tail gas, raw material is used as, improves product yield, reduce waste gas discharge, had
Beneficial to environmental protection.
Brief description of the drawings
Accompanying drawing is technological process of production sketch of the present invention.
Specific embodiment
Implementation steps of the invention are made with further detail with reference to above-mentioned accompanying drawing and specific embodiment to illustrate, with profit
In the understanding the object, technical solutions and advantages of the present invention for becoming more apparent.Be necessary it is pointed out here that, it is discussed below
Specific embodiment be served only for further illustrating that the present invention is carried out, it is impossible to be interpreted as limiting the scope of the invention,
The person skilled in the art in the field can make some nonessential modifications and adaptations or to part according to the invention described above content
Equipment is replaced with similar equipment, and embodiment is as follows：
The first step, opens the connecting valve of liquefied gas pipeline and burner 4, to the supply of burner 4 and ignition, makes anti-
Stove is penetrated to be heated intensification；
Second step, by control valve 12 to being replenished water in stuffing washing tower 9 70 centimetres above the entrance of control valve 13
Position, open in-let dimple valve 13 and control of export valve 8, start detergent circulator 7, start smoking blower fan 14；
3rd step, when reverberatory furnace is heated is warmed up to 700 degrees Celsius, raw material is opened in the other end opposite with burner end
Phosphoric acid,diluted in-let dimple valve 15, concentration is that 43% raw material phosphoric acid,diluted enters reverberatory furnace 5, and where flowing to burner one
End, is heated up rapidly in the reverberatory furnace of high temperature in flow process, is concentrated, is polymerized, and temperature stabilization control is 740 in reverberatory furnace
To between 750 degrees Celsius, the oligomeric phosphoric acid of preliminary polymerization flows out through control of export valve 21, is collected through oligomeric phosphorus acid tank 19, low
Polyphosphoric acid groove is furnished with oligomeric phosphoric acid circulating pump 17, and the oligomeric phosphoric acid that will be collected is through pump intake control valve 18 and control of export valve
16 pump into reverberatory furnace, are concentrated with profit circulation, are polymerized；
4th step, a part of oligomeric phosphoric acid of the inside of oligomeric phosphorus acid tank 19 is flowed out by control valve 20, is produced as one kind
Product are directly packed, and concentration has reached 96% after testing；
5th step, other do not continue one end stream to where burner from the oligomeric phosphoric acid of the outflow of control of export valve 21
It is dynamic, and further concentrate, be polymerized, then flowed out through control of export valve 3, collected through polyphosphoric acids groove 2, then by control valve
1 outflow, then directly packs as major product, and concentration has reached 105.3% after testing；
6th step, the water vapour in reverberatory furnace 5 obtained by vaporization is formed together with a small amount of phosphoric acid steam of flue gas and entrained with
Tail gas through smoking blower fan 14 be pumped into stuffing washing tower 9, the bottom of stuffing washing tower 9 equipped with detergent circulator 7, circulating cleaning solution
Shower nozzle 11 is pumped into through in-let dimple valve 13 and control of export valve 8, it is a small amount of in absorption tail gas to spray into stuffing washing tower 9
Phosphoric acid steam, the tail gas after recycling is emptied through chimney 10, through checking in the cleaning solution for cyclic absorption tail gas in production
After reaching 38% concentration, open control valve 6 and flow into the concentration of conduct supplement raw material, polymerization in reverberatory furnace 5, then by controlling valve
Door 12 supplements water to stuffing washing tower 9, the liquid level of stuffing washing tower 9 is located in the state of the operation of detergent circulator 7
50 centimetres of position above the entrance of control valve 13.
Claims (6)
1. a kind of method and apparatus by Wet-process Phosphoric Acid Production polyphosphoric acids, is primarily characterized in that, including pipeline connection successively
Burner (4), reverberatory furnace (5), polyphosphoric acids groove (2), oligomeric phosphorus acid tank (19), oligomeric phosphoric acid circulating pump (17), smoking wind
Machine (14), stuffing washing tower (9), detergent circulator (7), shower nozzle (11), chimney (10), multiple control valves.
2. the method and apparatus by Wet-process Phosphoric Acid Production polyphosphoric acids according to claim 1, it is characterised in that：It is implemented
Main technological steps include：
The first step, liquefied gas passes through an end burning of the burner (4) in reverberatory furnace (5), there is provided wet-process phosphoric acid concentration, polymerization institute
The heat energy of needs；
Second step, raw material phosphoric acid,diluted enters reverberatory furnace (5) from the other end opposite with burner end through in-let dimple valve (15),
And the one end where flowing to burner, heated up rapidly in the reverberatory furnace of high temperature in flow process, concentrated, be polymerized, tentatively
The oligomeric phosphoric acid of polymerization flows out through control of export valve (21), is collected through oligomeric phosphorus acid tank (19), and oligomeric phosphorus acid tank is equipped with oligomeric
Phosphoric Acid Circulating Pump (17), reflection is pumped into by the oligomeric phosphoric acid collected through pump intake control valve (18) and control of export valve (16)
Stove, is concentrated with profit circulation, is polymerized；
3rd step, according to the actual requirements, oligomeric phosphoric acid inside oligomeric phosphorus acid tank (19) is flowed out by control valve (20), can be with
Directly packed as a kind of product；
4th step, other oligomeric phosphoric acids not from control of export valve (21) outflow continue to burner institute in reverberatory furnace (5)
One end flowing, and further concentrate, polymerization, then through control of export valve (3) flow out, through polyphosphoric acids groove (2) collect,
Flowed out by control valve (1) again, then directly packed as major product；
Water vapour in 5th step, reverberatory furnace (5) produced by vaporization is formed together with a small amount of phosphoric acid steam of flue gas and entrained with
Tail gas is pumped into stuffing washing tower (9) through smoking blower fan (14), and stuffing washing tower (9) bottom is furnished with detergent circulator (7), circulation
Cleaning solution pumps into shower nozzle (11) through in-let dimple valve (13) and control of export valve (8), to spray into stuffing washing tower (9), inhales
A small amount of phosphoric acid steam in ending gas, the tail gas after recycling is emptied through chimney (10), for the washing of cyclic absorption tail gas
After liquid reaches finite concentration, it is used as the concentration of supplement raw material, polymerization in flowing into reverberatory furnace (5) by control valve (6), by control
Valve (12) supplements water to keep the liquid level of zone of reasonableness to stuffing washing tower (9).
3. the method and apparatus by Wet-process Phosphoric Acid Production polyphosphoric acids according to claim 1, it is characterised in that：It is adopted
Raw material is phosphoric acid by wet process of the concentration 25% to 60%, and products obtained therefrom is reach general international standard 95% to 105%
Polyphosphoric acids.
4. the method and apparatus by Wet-process Phosphoric Acid Production polyphosphoric acids according to claim 1, it is characterised in that：Described
Reverberatory furnace temperature control at 500 to 900 degrees Celsius, preferably 700 to 800 degrees Celsius.
5. the method and apparatus by Wet-process Phosphoric Acid Production polyphosphoric acids according to claim 1, it is characterised in that：Described
Reverberatory furnace inner lining material can be by the corrosion-and high-temp-resistant material such as high temp glass, refractory brick, dolomite, quartz sand, graphite, magnesite
Material is made.
6. the method and apparatus by Wet-process Phosphoric Acid Production polyphosphoric acids according to claim 1, it is characterised in that：Described
Reverberatory furnace shape can be square, trapezoidal, semicircle top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710101146.9A CN106672931B (en) | 2017-02-24 | 2017-02-24 | Method and equipment for producing polyphosphoric acid from wet-process phosphoric acid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710101146.9A CN106672931B (en) | 2017-02-24 | 2017-02-24 | Method and equipment for producing polyphosphoric acid from wet-process phosphoric acid |
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| CN106672931A true CN106672931A (en) | 2017-05-17 |
| CN106672931B CN106672931B (en) | 2021-06-11 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107200314A (en) * | 2017-06-27 | 2017-09-26 | 贵州东晟捷能科技有限公司 | The micro- method and its device for absorbing joint energy recovery of a kind of thermal phosphoric acid and polyphosphoric acid |
| CN110155976A (en) * | 2019-04-11 | 2019-08-23 | 贵州开磷集团矿肥有限责任公司 | A method of reducing wet phosphoric acid extracting bath liquid level protection top erosion resistant coating |
| CN112939682A (en) * | 2021-02-22 | 2021-06-11 | 深圳市芭田生态工程股份有限公司 | Preparation method of polyphosphate synergistic nitrophosphate fertilizer |
| CN116281905A (en) * | 2023-03-02 | 2023-06-23 | 昆明川金诺化工股份有限公司 | Device and method for producing polyphosphoric acid by using surplus washing acid |
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| US3423173A (en) * | 1965-12-08 | 1969-01-21 | Armour Agricultural Chem Co | Spray concentration of wet process orthophosphoric acid to polyphosphoric acid |
| CN1538935A (en) * | 2001-08-09 | 2004-10-20 | Method for making polyphosphiric acid | |
| CN103832986A (en) * | 2014-02-08 | 2014-06-04 | 绵阳启明星磷化工有限公司 | Preparation method for polyphosphoric acid |
| US20140377138A1 (en) * | 2009-03-26 | 2014-12-25 | Prayon Technologies | Method and Device for Producing Polyphosphoric Acid |
| CN105731405A (en) * | 2016-01-20 | 2016-07-06 | 昆明理工大学 | Hot-process phosphoric acid production device with low-temperature heat energy recovery |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3423173A (en) * | 1965-12-08 | 1969-01-21 | Armour Agricultural Chem Co | Spray concentration of wet process orthophosphoric acid to polyphosphoric acid |
| CN1538935A (en) * | 2001-08-09 | 2004-10-20 | Method for making polyphosphiric acid | |
| US20140377138A1 (en) * | 2009-03-26 | 2014-12-25 | Prayon Technologies | Method and Device for Producing Polyphosphoric Acid |
| CN103832986A (en) * | 2014-02-08 | 2014-06-04 | 绵阳启明星磷化工有限公司 | Preparation method for polyphosphoric acid |
| CN105731405A (en) * | 2016-01-20 | 2016-07-06 | 昆明理工大学 | Hot-process phosphoric acid production device with low-temperature heat energy recovery |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107200314A (en) * | 2017-06-27 | 2017-09-26 | 贵州东晟捷能科技有限公司 | The micro- method and its device for absorbing joint energy recovery of a kind of thermal phosphoric acid and polyphosphoric acid |
| CN107200314B (en) * | 2017-06-27 | 2018-05-29 | 贵州东晟捷能科技有限公司 | A kind of thermal phosphoric acid and micro- absorb of polyphosphoric acid combine the recoverable method of heat and its device |
| CN110155976A (en) * | 2019-04-11 | 2019-08-23 | 贵州开磷集团矿肥有限责任公司 | A method of reducing wet phosphoric acid extracting bath liquid level protection top erosion resistant coating |
| CN112939682A (en) * | 2021-02-22 | 2021-06-11 | 深圳市芭田生态工程股份有限公司 | Preparation method of polyphosphate synergistic nitrophosphate fertilizer |
| CN116281905A (en) * | 2023-03-02 | 2023-06-23 | 昆明川金诺化工股份有限公司 | Device and method for producing polyphosphoric acid by using surplus washing acid |
| CN116281905B (en) * | 2023-03-02 | 2024-03-26 | 昆明川金诺化工股份有限公司 | Device and method for producing polyphosphoric acid by using surplus washing acid |
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|---|---|
| CN106672931B (en) | 2021-06-11 |
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