CN105731406B - Half water law Wet Processes of Phosphoric Acid and system - Google Patents
Half water law Wet Processes of Phosphoric Acid and system Download PDFInfo
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- CN105731406B CN105731406B CN201610021173.0A CN201610021173A CN105731406B CN 105731406 B CN105731406 B CN 105731406B CN 201610021173 A CN201610021173 A CN 201610021173A CN 105731406 B CN105731406 B CN 105731406B
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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
- C01B25/18—Phosphoric acid
- C01B25/22—Preparation by reacting phosphate-containing material with an acid, e.g. wet process
- C01B25/222—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen
- C01B25/223—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen only one form of calcium sulfate being formed
- C01B25/226—Hemihydrate process
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Abstract
The invention discloses a kind of half water law Wet Processes of Phosphoric Acid and system, solve existing phosphoric acid process complex process equipment, reactivity and the problems such as yield is low, high energy consumption.Technical scheme includes half water reaction system and filtration system, the half water reaction system includes the multiple dissolving tanks being sequentially connected and multiple crystallization tanks, wherein, slurry circulation pump is provided with last crystallization tank in multiple crystallization tanks and low level dodges SAPMAC method pump, the slurry circulation pump is connected with first dissolving tank in multiple dissolving tanks, the low level dodges SAPMAC method pump and is connected through low level sudden strain of a muscle cooler with first crystallization tank in multiple crystallization tanks, and last described crystallization tank is also connected by filtering feed pump with filtration system.Present invention process and equipment are simple, floor space is small, reaction yield is high, energy consumption is low, investment is low, service life is long, driving rate is high.
Description
Technical field
The present invention relates to a kind of half water law Wet Processes of Phosphoric Acid and its system.
Background technology
Phosphoric acid by wet process is the main industrial chemicals of phosphorous chemical industry, for producing phosphorus compound fertilizer product, can be used for producing various
Phosphate product, food grade phosphoric acid, electron-level phosphoric acid.It is the basic skills of phosphoric acid by wet process with sulfuric acid decomposition phosphorus ore.
Main chemical compositions are Ca in phosphorus ore5F(PO4)3, when it is with sulfuric acid reaction, generate phosphoric acid and slightly solubility sulfuric acid
Calcium crystallizes.Its chemical equation is as follows：
Ca5F(PO4)3+5H2SO4+mH2O=3H3PO4+5CaSO4·m/5H2O↓+HF↑
Calcium sulfate can be precipitated out with three kinds of different crystal habits, respectively calcium sulphate dihydrate (CaSO42H2O),
Half-H 2 O calcium sulphate (CaSO41/2H2O) and dead plaster (CaSO4).By controlling technological reaction condition, crystallization half water of generation
Calcium sulfate, referred to as half wet technology.
The half water law Wet Processes of Phosphoric Acid wet phosphoric acid by dihydrate technique that compares has phosphoric acid product concentration height (P2O5Concentration
Can to 45%), phosphoric acid quality good (impurity, sulfate radical and solid content are low), energy consumption is low the features such as；Contrast the water law wet method of half water-two
Phosphoric acid process, have the characteristics that technological process is short, investment is low, operation is easy, half water law Wet Processes of Phosphoric Acid still has accordingly
Market.At present, although domestic had half water law Wet Phosphoric Acid Plant of more sets, problems with mostly be present：
1. equipment is complicated, floor space is big, unit scale is small (100,000 tons/year), reaction yield is low, and total recovery only has 94%
Left and right；
2. dissolving tank and crystallization tank are circular trough body structure, multiple series connection, floor space is big, and circular trough exists in stirring
A large amount of eddy flows, phosphorus ore and sulfuric acid diffusion velocity and uniformly mixing are influenceed, phosphorus ore parcel is locally too high with sulfuric acid concentration and produces blunt
Change phenomenon is serious, and phosphorus ore reaction yield is low, and material consumption is high；
3. reaction heat and the sulfuric acid heat of dilution are dodged cooler by a high position and removed in crystallization tank, the high-order temperature for dodging cooler slurry is passed in and out
Difference is typically at 10-15 DEG C, and difference variation is big, and half water ardealite in slurry is easily dispersed into broken grain, and sad filter, Washing ratio is low, P2O5
Loss is big, and phosphogypsum quality is poor；In addition, when phosphoric acid contains substantial amounts of little crystallization, when phosphoric acid conveys and stores, little crystallization is known from experience
Fouling of growing up is attached in pipeline and equipment, blocks pipeline and equipment, pipeline and equipment parking cleaning are frequent, device driving rate
It is low.
4. the filtrate of half water filtering machine is vapour-liquid hybrid separation, the design of vapour-liquid hybrid separation is entered in the lower liquid pipe of filter
OK, longer separated space is left in lower liquid pipe, height of downcomer requires more than 10m, corresponding investment increase.
5. for lower cross gas plate without area is blotted, substantial amounts of filter cloth wash water can not penetrate filter cloth and filter disc in half water filtering machine, be detained
On filter cloth, into the initial filter area of half water filtering machine and filtering area, the phosphoric acid concentration in initial filter area and a filter area is caused to decline excessive,
Reach 1%, phosphoric acid concentration often declines 1%, then needs more consumption 0.4t steam/t P2O5。
The content of the invention
The invention aims to solve above-mentioned technical problem, there is provided a kind of equipment is simple, floor space is small, reaction is received
Rate is high, the large-scale half water law phosphoric acid by wet process system that energy consumption is low, investment is low, service life is long, driving rate is high.
The present invention also provides that a kind of technique is simple, reliable, few low with operating cost, the environmentally friendly, energy consumption of plant investment
It is low, product yield is high, the measured half water law Wet Processes of Phosphoric Acid of matter.
Present system includes half water reaction system and filtration system, and the half water reaction system is more including being sequentially connected
Individual dissolving tank and multiple crystallization tanks, wherein, it is provided with slurry circulation pump and low level in last crystallization tank in multiple crystallization tanks
SAPMAC method pump is dodged, the slurry circulation pump is connected with first dissolving tank in multiple dissolving tanks, and the low level dodges SAPMAC method pump
Cooler is dodged through low level to be connected with first crystallization tank in multiple crystallization tanks, last described crystallization tank is also by filtering feed pump
It is connected with filtration system.
The dissolving tank and crystallization tank are square trough body structure, shape after multiple dissolving tanks and multiple crystallization tank close-packed arrays
The square reactive tank of the multi-region big into one；The low level dodges SAPMAC method shurry pump and slurry circulation pump uses vertical pump.
The filtration system includes the turntable type filter being sequentially connected and the lower cross gas plate with steam-heating system, institute
Stating turntable type filter, there is feed zone, filtering area, two Xi Qu, one to wash area, slag dumping area, water collecting region, cloth wash zone on cloth
With wash water Disengagement zone, there are the lower cross gas plate initial filter area, a filter area, two filter areas, three to filter areas, plant water collecting region and blot
Area, wherein, the gas vent at the top of the initial filter area of the lower cross gas plate, a filter area, two filter areas and three filter areas is through vacuum vapour-liquid point
Connected from device, the gas vent for blotting area of the lower cross gas plate is connected through blotting gas-liquid separator with sucktion fan.
The vacuum vapour liquid separator, the wash water for blotting water collecting region on the cloth of vapour liquid separator and turntable type filter go out
Mouth is connected with rinsing the liquid-inlet of gypsum tank, and the liquid outlet for rinsing gypsum tank is through pump and turntable type filter
Two wash area connection.
The initial filter area of the lower cross gas plate and the dissolving tank of the liquid outlet through pump Yu the half water reaction system in two filter areas
Connected with crystallization tank, three filter areas of the lower cross gas plate and plant the liquid outlet of water collecting region and be connected with filter cloth wash water groove,
The filter cloth wash water tank liquid outlet is connected through pump with the shower nozzle of turntable type filter cloth scrubbing section.
In the half water reaction process, ground phosphate rock is first reacted in multiple dissolving tanks of series connection, generates tiny half water
Overflow further crystallizes into the multiple crystallization tanks connected again for ardealite and phosphoric acid material pulp, half water ardealite and phosphoric acid material pulp, shape
Into thick half water ardealite crystal, the part slurry of last crystallization tank internal upper part dodges SAPMAC method through low level and is pumped into low level sudden strain of a muscle
First crystallization tank of loopback after cooler cooling, the temperature difference for controlling inlet and outlet slurry in low level sudden strain of a muscle cooler is 3-5 DEG C, and low level dodges cooler
Pressure be 18-22kPa (A), remainder slurry send first dissolving tank as slurry is returned through slurry circulation blowback；It is described last
The filtered feed of slurry of one crystallization tank inner bottom part is pumped into filter progress.
The dissolving tank and crystallization tank are square trough body structure, shape after multiple dissolving tanks and multiple crystallization tank close-packed arrays
The square reactive tank of the multi-region big into one；The low level dodges SAPMAC method shurry pump and slurry circulation pump uses vertical pump.
By the addition of phosphorus ore and a small amount of sulfuric acid, the sulfate radical content in multiple dissolving tanks is controlled less than CaO content to promote
Enter the progress of half water reaction, form stable half-H 2 O calcium sulphate (CaSO4·1/2H2O)；It is more by the addition of a large amount of sulfuric acid, control
Sulfate ion content is higher than CaO content to promote half-H 2 O calcium sulphate (CaSO in individual crystallization tank4·1/2H2O) formed thick square
Crystal.
Solid content is in 33-35%, liquid phase acid P in the slurry of control feeding filter progress2O5Concentration is in 43~45wt%
P2O5, dissolving tank temperature control is at 90-95 DEG C, and crystallization tank temperature control is at 95-100 DEG C.
In the filter progress, the slurry for carrying out inherent filtration feed pump is first sent into turntable type filter progress washing and filtering, filter
Cake wash water is sent into the one of turntable type filter simultaneously and washes area to filter cake countercurrent washing；Turntable type filter has feed zone, filtering
Area, two Xi Qu, one wash area, slag dumping area, water collecting region, cloth wash zone and wash water Disengagement zone on cloth, the filter of turntable type filter
Liquid is sent into the lower cross gas plate with steam-heating system, and the lower cross gas plate has an initial filter area, a filter area, two filter areas, three filter areas,
Plant water collecting region and blot area, the gas at the top of the lower cross gas plate initial filter area, a filter area, two filter areas and three filter areas is sent into true
Empty vapour liquid separator carries out gas-liquid separation；The lower cross gas plate blot area's top gas through blot vapour liquid separator separation after by
Sucktion fan is extracted out, and the lower cross gas plate one filters the filtrate in area, and to be pumped up out battery limit (BL) be phosphoric acid product, the turntable type filter
Slag dumping area discharge ardealite go to gypsum stockyard.
Water is received on the cloth of the liquid of the vacuum vapour liquid separator, the liquid for blotting vapour liquid separator and turntable type filter
Ji Qu wash water is sent into rinse after gypsum tank is collected and is pumped up washing area as flushing liquor into the two of turntable type filter again.
The filtrate in the initial filter area of the lower cross gas plate and two filter areas send the dissolving of half water reaction process as acid reflux through blowback
Groove connects with crystallization tank, and the lower cross gas plate three filters the filtrate in area and plants the wash water of water collecting region after the collection of filter cloth wash water groove
The shower nozzle ejection for being re-fed into the cloth wash zone of turntable type filter is used as flushing liquor.
Beneficial effect：
(1) the high-order cooler that dodges of cooler replacement is dodged using low level and removes reaction heat and the sulfuric acid heat of dilution, shorten pipeline, reduction pressure
Head, the vertical pump of big flow, low-head and Low Temperature Difference can be used；(disengaging low level dodges the temperature of cooler slurry for big flow, Low Temperature Difference
Difference control 3-5 DEG C) sudden strain of a muscle SAPMAC method slurry, make it is multiple crystallization inside groove sulfate concentration differences it is small, thermograde is low, half water ardealite
For thick square crystallization, it is easy to filter and washs, P2O5Washing ratio is up to 97.2%.
(2) it is square trough body structure by the dissolving tank and crystallization tank, multiple dissolving tanks and multiple crystallization tanks are closely arranged
A square reactive tank of big multi-region is formed after row, this structural benefit has three：First, between each dissolving tank between each crystallization tank
Bottom connects, elimination reaction dead band, and reaction slurry flows under liquid level difference effect；Second, during agitation, square trough body structure is broken
Eddy flow caused by ring stirring, phosphorus ore and sulfuric acid diffusion are fast, are well mixed, and phosphorus ore parcel and passivation are few, the reaction yield of phosphorus ore
Up to 99.4%；Third, experiment proves that in the case where ensureing same reaction yield agitator power is in square trough body structure
0.5Kw/m3, agitator power is 0.75Kw/m3 in round trough body structure, is saved using the square trough body structure power consumption of the present invention
50%；
(3) in filter progress, the separation of turntable type filter gas-liquid is carried out in lower cross gas plate, and fixed gas is from lower cross gas plate top
Portion is drawn, and liquid flows out from lower cross gas plate bottom through lower liquid pipe, and so, lower liquid pipe is short, and setting height(from bottom) is low, filter frame expense
It is low；Other cross gas plate carries steam-heating system, and filtrate is not easy the fouling in lower cross gas plate, and the frequency of cleaning is few, filter fortune
The row time is grown.
(4) the lower cross gas plate blots area's connection sucktion fan, most in the wash water Disengagement zone of turntable type filter
Wash water under the promotion of draft, penetrate filter disc and enter and wash and rush gypsum tank, without entering other filtering areas, the acid filtering in initial filter area
Concentration only declines 0.3%, and the product phosphoric acid concentration in a filter area only declines 0.1%, improves product design, reduces energy consumption.
(5) present invention process is simple, reliable, and compared with the technique of existing operation, plant investment can reduce by 10%, and energy consumption can
30% is reduced, environmentally friendly, phosphorus ore product yield is up to more than 96%, and present system is simple in construction, good reliability, easily
In installation, maintenance and safeguard, produce scale per year up to more than 400,000 tons.
Brief description of the drawings
Fig. 1 is half water reaction system figure in the present invention；
Fig. 2 is the partial structural diagram of slurry circulation in dissolving tank and crystallization tank in half water reaction process.
Fig. 3 is filtration system figure in the present invention.
Wherein, 1- dissolving tanks, 2- dissolving tanks, 3- dissolving tanks, 4- dissolving tanks, 5- crystallization tanks, 6- crystallization tanks, 7- agitators,
8- filterings feed pump, 9- low levels dodge SAPMAC method pump, 10- low levels dodge cooler, 11- dodges cold demister, 12- slurry circulations pump, 13- mistakes
Acid filtering pump, 14- acid refluxes pump, 15- mono- wash pump, 16- filter cloth wash waters pump, 17- turntable types filter, 17.1- feed zones, 17.2- mistakes
Filter area, 17.3- bis- washes area, 17.4- mono- washes area, 17.5- slag dumpings area, water collecting region on 17.6- cloth, 17.7- cloth wash zones,
17.8- wash waters Disengagement zone, 18- filter cloth wash waters groove, 19- rinses gypsum tank, 20- blots vapour liquid separator, 21- sucktion fans,
Cross gas plate, 23.1- initial filters area, the filters of 23.2- mono- area, the filters of 23.3- bis- area, 23.4- tri- are filtered under 22- vacuum vapour liquid separator, 23-
Area, 23.5- plant water collecting region, 23.6- blots area.
Embodiment
Explanation is further explained to present system below in conjunction with the accompanying drawings：
Present system includes half water reaction system (see Fig. 1) and filtration system (see Fig. 3), and referring to Fig. 1, half water is anti-
To answer in system, four dissolving tanks 1,2,3,4 and two crystallization tanks 5,6 with agitator with agitator are to be sequentially connected in series,
The dissolving tank and crystallization tank are square trough body structure, and all dissolving tanks are made with crystallization tank of concrete formed by integrally casting, shape
The square reactive tank (see Fig. 2) for having six areas into one, is easily installed and saves space, wherein, in last crystallization tank 6
SAPMAC method pump 9 is dodged provided with slurry circulation pump 12 and low level, the slurry circulation pump 12 is connected with first dissolving tank 1, described low
Position is dodged SAPMAC method pump 9 and is connected with low level sudden strain of a muscle cooler 10, and the gas vent that the low level dodges cooler 10 is connected with dodging cold demister 11,
Liquid outlet is connected with first crystallization tank 5, and the also filtered feed pump 8 of last crystallization tank 6 is connected with filtration system.It is described
Circulation shurry pump 8 uses vertical pump.
The filtration system includes the turntable type filter 17 being sequentially connected and the lower cross gas plate with steam-heating system
23, the turntable type filter there is feed zone 17.1, filtering area 17.2, two to wash area 17.3, one wash area 17.4, slag dumping area
17.5th, water collecting region 17.6, cloth wash zone 17.7 and wash water Disengagement zone 17.8 on cloth, the lower cross gas plate 23 have initial filter area
23.1st, a filter area 23.2, two filters area 23.3, three and filters area 23.4, plants water collecting region 23.5 and blot area 23.6.During work, institute
State turntable type filter 17 constantly to rotate, feed zone 17.1, filtering area 17.2, two wash that area 17.4 is washed in area 17.3, one and filter cloth is washed
The filtrate for washing area 17.7 is flowed into lower cross gas plate 23.
Filter area 23.2, two and filter the gas that the top of area 23.4 is filtered in area 23.3 and three in the initial filter area 23.1, one of the lower cross gas plate 23
Body outlet connects through vacuum vapour liquid separator 22, and the gas vent for blotting area 23.6 of the lower cross gas plate 23 is through blotting gas-liquid point
It is connected from device 20 with sucktion fan 21, forms vacuum using sucktion fan, make the wash water Disengagement zone 17.8 of turntable type filter 17
Middle most water that plants is more easy to enter to wash through lower cross gas plate to rush gypsum tank 19.The vacuum vapour liquid separator 22, blot vapour
Liquid of the liquid outlet of water collecting region 17.6 with rinsing gypsum tank 19 on the cloth of liquid/gas separator 20 and turntable type filter 17
Body import connects, and the liquid outlet for rinsing gypsum tank 19 washes pump 15 through one and washes area 17.3 with the two of turntable type filter 17
Connection；The liquid outlet that area 23.3 is filtered in the initial filter area 23.1 and two of the lower cross gas plate 23 reacts through acid reflux pump 14 and half water
Three dissolving tanks 1,2,3 and crystallization tank 5 of system connect, and three filter areas 23.4 of the lower cross gas plate 23 plant water receipts with area is blotted
The liquid outlet in collection area 23.5 is connected with filter cloth wash water groove 18, the filter with turntable type filter 17 respectively of filter cloth wash water groove 18
The shower nozzle connection of cloth scrubbing section 17.7.
Technical process：
Referring to accompanying drawing, half water law Wet Processes of Phosphoric Acid of the invention includes half water reaction process and filter progress, half water
In reaction process, ground phosphate rock is first sent into dissolving tank 1, while acid reflux is sent into dissolving tank 1,2,3 and crystallization tank 5, sulfuric acid is sent into
In dissolving tank 2,3 and crystallization tank 5, by liquid level difference, phosphoric acid flows through four dissolving tanks and carries out half water reaction successively, controls dissolving tank
In sulfate ion content less than CaO content to promote the progress that half water reacts, slurry overflow containing reactant enters knot
In brilliant groove 5 and crystallization tank 6, sulfate ion content in crystallization tank is controlled to be higher than CaO content to promote reactant to form thick crystalline substance
Body, the part slurry on the top of crystallization tank 6 dodge SAPMAC method pump 9 through low level and are sent into loopback crystallization tank 5 after low level dodges the cooling of cooler 10, control
The temperature difference that low level processed dodges the inlet and outlet slurry of cooler 10 is 3-5 DEG C, and the pressure that low level dodges cooler 10 is 18-22kPa (A), remaining
Part slurry send dissolving tank 1 through slurry circulation blowback, and the filtered feed pump 8 of slurry of the inner bottom part of crystallization tank 6 is sent into filtering
The turntable type filter 17 of process, the dissolving tank and crystallization tank are square trough body structure, and the circulation shurry pump 9 is vertical
Pump.Solid content is in 33-35wt%, liquid phase acid P in the slurry sent out through the filtered feed pump 8 of slurry2O5Concentration is in 43-45wt%
P2O, the slurry temperature in dissolving tank 1,2,3,4 control the temperature control of the slurry in 90-95 DEG C, crystallization tank 5,6 in 95-100
℃。
In the filter progress, the slurry for carrying out inherent filtration feed pump is sent into the progress washing and filtering of turntable type filter 17, filter
Cake wash water is sent into the one of turntable type filter 17 simultaneously and washes area 17.4 to filter cake countercurrent washing；The feed zone of turntable type filter 17
17.1st, filtering area 17.2, two, which washes area 17.3, one and washes in area 17.4 and wash water Disengagement zone 17.8 filtrate that filters out and be sent into, carries steam
Filter area 23.2, two and filter filter area 23.4 of area 23.3, three, the lower cross gas plate in the initial filter area 23.1, one of the cross gas plate 23 of heating system
Filter area 23.2, two and filter the gas feeding vacuum vapour liquid separator that the top of area 23.4 is filtered in area 23.3 and three in 23 initial filter area 23.1, one
22 carry out gas-liquid separation, the gas subsequent treatment isolated；The top gas of area 23.6 that blots of the lower cross gas plate 23 is sent into suction
(it is -50kPa to control vacuum), the lower cross gas plate are extracted out by sucktion fan 21 after the progress vapor-liquid separation of net gas liquid/gas separator 20
It is phosphoric acid product that the liquid in 23 1 filter areas 23.2 largely sends out battery limit (BL) after the pressurization of acid filtering pump 13, and small portion, which returns, makees acid reflux,
To adjust the P in acid reflux2O5Concentration, the ardealite that the slag dumping area 17.5 of the turntable type filter 17 discharges go to gypsum stockyard.
Liquid that the vacuum vapour liquid separator 22 is isolated, the liquid isolated and turntable for blotting vapour liquid separator 20
The filtrate of water collecting region 17.6 is sent into rinse to wash pump 15 through one again after gypsum tank 19 is collected and be sent into and turned on the cloth of formula filter 17
The two of desk type filtration machine 17 wash area 17.3 and are used as cleaning solution.
The filtrate in the initial filter area 23.1 of lower cross gas plate 23 and two filter areas 23.4 is as acid reflux through the water of 13 loopback of acid reflux pump half
The dissolving tank 1,2,3 and crystallization tank 5 of reaction process, the P of the acid reflux2O5Concentration is controlled in 35-37wt%；The lower cross gas plate
23 three filter areas 23.4 are sent into turntable type filter 17 with the filtrate for planting water collecting region 23.5 after the collection of filter cloth wash water groove 18
The shower nozzle of cloth wash zone 17.7 as flushing liquor.
The phosphoric acid product and phosphorus stone obtained through certain project using half water law Wet Processes of Phosphoric Acid of the invention and system application
The index of cream is as follows:
Using half water law Wet Processes of Phosphoric Acid of the invention and system compared with existing half water law phosphoric acid by wet process system, device is thrown
Money drop 10%, operating cost drop 15%, production scale can be expanded to 400,000 tons/year of P2O5。
Claims (10)
1. a kind of large-scale half water law phosphoric acid by wet process system, including half water reaction system and filtration system, it is characterised in that described half
Water reaction system includes the multiple dissolving tanks being sequentially connected and multiple crystallization tanks, wherein, last knot in multiple crystallization tanks
Slurry circulation pump is provided with brilliant groove and low level dodges SAPMAC method pump, the slurry circulation pump and first dissolving in multiple dissolving tanks
Groove is connected, and the low level dodges SAPMAC method pump and dodges cooler through low level to be connected with first crystallization tank in multiple crystallization tanks, it is described most
The latter crystallization tank is also connected by filtering feed pump with filtration system；The filtration system includes the turntable type mistake being sequentially connected
Filter and the lower cross gas plate with steam-heating system, the turntable type filter have feed zone, filtering area, two Xi Qu, one
Area, slag dumping area, water collecting region, cloth wash zone and wash water Disengagement zone on cloth are washed, the lower cross gas plate has initial filter area, a filter
Area, two filter areas, three filter areas, plant water collecting region and blot area, wherein, the initial filter area of the lower cross gas plate, a filter area, two filter areas
It is connected with the gas vent at the top of three filter areas through vacuum vapour liquid separator with subsequent treatment, the gas for blotting area of the lower cross gas plate
Body outlet is connected through blotting vapour liquid separator with sucktion fan.
2. large-scale half water law phosphoric acid by wet process system as claimed in claim 1, it is characterised in that the dissolving tank and crystallization tank are equal
For square trough body structure, a square reactive tank of big multi-region is formed after multiple dissolving tanks and multiple crystallization tank close-packed arrays；Institute
State low level sudden strain of a muscle SAPMAC method pump and slurry circulation pump uses vertical pump.
3. large-scale half water law phosphoric acid by wet process system as claimed in claim 1, it is characterised in that the vacuum vapour liquid separator,
Blot liquid-inlet of the washing water outlet of water collecting region on vapour liquid separator and turntable type filter cloth with rinsing gypsum tank
Connection, the liquid outlet for rinsing gypsum tank are washed area with the two of turntable type filter through pump and are connected.
4. large-scale half water law phosphoric acid by wet process system as claimed in claim 1, it is characterised in that the initial filter area of the lower cross gas plate
It is connected with the liquid outlet in two filter areas through pump with the dissolving tank and crystallization tank of the half water reaction system, the three of the lower cross gas plate
Filter area and plant the liquid outlet of water collecting region and be connected with filter cloth wash water groove, the liquid outlet of the filter cloth wash water groove through pump and
The shower nozzle connection of turntable type filter cloth scrubbing section.
5. a kind of half water law Wet Processes of Phosphoric Acid, including half water reaction process and filter progress, it is characterised in that half water is anti-
Answer in process, ground phosphate rock is first reacted in multiple dissolving tanks of series connection, generates tiny half water ardealite and phosphoric acid material pulp, partly
Into the multiple crystallization tanks connected, further crystallization forms thick square crystal for overflow again for water ardealite and phosphoric acid material pulp, last
The part slurry of individual crystallization tank internal upper part, which through low level dodges SAPMAC method and is pumped into low level and dodges cooler flash distillation cooling, removes the heat of dilution and anti-
After answering heat, first crystallization tank is flow back into certainly, and the temperature difference for controlling inlet and outlet slurry in low level sudden strain of a muscle cooler is 3-5 DEG C, and low level sudden strain of a muscle is cold
The pressure of device is 18-22kPa abs, and remainder slurry send first dissolving tank as slurry is returned through slurry circulation blowback；It is described
The filtered feed of slurry of last crystallization tank inner bottom part is pumped into filter progress；In the filter progress, come inherent filtration to
Expect that the slurry of pump is sent into turntable type filter and carries out washing and filtering, be sent into the one of turntable type filter washes area pair to filter cake wash water simultaneously
Filter cake countercurrent washing；Turntable type filter have feed zone, filtering area, two Xi Qu, one wash area, slag dumping area, water collecting region on cloth,
Cloth wash zone and wash water Disengagement zone, the filtrate of turntable type filter is sent into the lower cross gas plate with steam-heating system, described
Lower cross gas plate has initial filter area, and a filter area, two filter areas, three filter areas, plant water collecting region and blot area, the lower cross gas plate initial filter
Gas at the top of area, a filter area, two filter areas and three filter areas is sent into vacuum vapour liquid separator and carries out gas-liquid separation；The lower cross gas plate
The area's top gas that blots extracted out after blotting vapour liquid separator separation by sucktion fan, the lower cross gas plate one filters the filter in area
It is phosphoric acid product that liquid, which is pumped up out battery limit (BL), and the ardealite of the slag dumping area discharge of the turntable type filter goes to gypsum stockyard.
6. half water law Wet Processes of Phosphoric Acid as claimed in claim 5, it is characterised in that the dissolving tank and the crystallization tank side of being
A square reactive tank of big multi-region is formed after shape trough body structure, multiple dissolving tanks and multiple crystallization tank close-packed arrays；It is described low
SAPMAC method pump is dodged in position and slurry circulation pump uses vertical pump.
7. half water law Wet Processes of Phosphoric Acid as claimed in claim 5, it is characterised in that by phosphorus ore and a small amount of sulfuric acid plus
Enter, control the sulfate radical content in multiple dissolving tanks to be less than CaO content, to promote the progress of half water reaction, form stable half
H 2 O calcium sulphate crystallizes；By the addition of a large amount of sulfuric acid, sulfate ion content in multiple crystallization tanks is controlled to be higher than CaO content to promote
Enter reactant half-H 2 O calcium sulphate and form thick square crystal.
8. half water law Wet Processes of Phosphoric Acid as claimed in claim 5, it is characterised in that control is sent into the slurry of filter progress
Solid content is in 33-35%, liquid phase acid P2O5Concentration is in 43~45wt%P2O5, dissolving tank temperature control is at 90-95 DEG C, crystallization tank
Temperature control is at 95-100 DEG C.
9. half water law Wet Processes of Phosphoric Acid as claimed in claim 5, it is characterised in that the liquid of the vacuum vapour liquid separator
The wash water of water collecting region, which is sent into, on the cloth of body, the liquid for blotting vapour liquid separator and turntable type filter rinses the collection of gypsum tank
It is pumped up washing area as flushing liquor into the two of turntable type filter again afterwards.
10. half water law Wet Processes of Phosphoric Acid as claimed in claim 5, it is characterised in that the initial filter area of the lower cross gas plate and
The filtrate in two filter areas send the dissolving tank of half water reaction process to be connected with crystallization tank as acid reflux through blowback, and the lower cross gas plate three is filtered
The filtrate in area is re-fed into the cloth wash zone of turntable type filter with the wash water for planting water collecting region after the collection of filter cloth wash water groove
Shower nozzle spray be used as flushing liquor.
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| CN110451470A (en) * | 2019-09-20 | 2019-11-15 | 瓮福达州化工有限责任公司 | Countercurrent washing system and method in a kind of wet method phosphoric acid manufacture process |
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| US3690826A (en) * | 1965-02-02 | 1972-09-12 | Albert Leon Lucien Husken | Process for the production of phosphoric acid by the wet method |
| CN102674279A (en) * | 2012-06-08 | 2012-09-19 | 贵州川恒化工有限责任公司 | Method for producing phosphoric acid by hemihydrate technique |
| CN202657962U (en) * | 2012-06-08 | 2013-01-09 | 贵州川恒化工有限责任公司 | Hemihydrate wet process phosphate reaction device |
| CN105036101A (en) * | 2015-08-11 | 2015-11-11 | 中国五环工程有限公司 | Semi-hydrated-two-hydrated wet process phosphoric acid production process and system thereof |
| CN205367730U (en) * | 2016-01-13 | 2016-07-06 | 中国五环工程有限公司 | Half water law phosphoric acid by wet process system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3690826A (en) * | 1965-02-02 | 1972-09-12 | Albert Leon Lucien Husken | Process for the production of phosphoric acid by the wet method |
| CN102674279A (en) * | 2012-06-08 | 2012-09-19 | 贵州川恒化工有限责任公司 | Method for producing phosphoric acid by hemihydrate technique |
| CN202657962U (en) * | 2012-06-08 | 2013-01-09 | 贵州川恒化工有限责任公司 | Hemihydrate wet process phosphate reaction device |
| CN105036101A (en) * | 2015-08-11 | 2015-11-11 | 中国五环工程有限公司 | Semi-hydrated-two-hydrated wet process phosphoric acid production process and system thereof |
| CN205367730U (en) * | 2016-01-13 | 2016-07-06 | 中国五环工程有限公司 | Half water law phosphoric acid by wet process system |
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