CN106241759A - A kind of wet lump ore is with addition of char particle type phosphoric acid preparation system and method - Google Patents
A kind of wet lump ore is with addition of char particle type phosphoric acid preparation system and method Download PDFInfo
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- CN106241759A CN106241759A CN201610818998.5A CN201610818998A CN106241759A CN 106241759 A CN106241759 A CN 106241759A CN 201610818998 A CN201610818998 A CN 201610818998A CN 106241759 A CN106241759 A CN 106241759A
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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
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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
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Abstract
The invention belongs to technical field of phosphorous chemical industry, be specifically related to a kind of wet lump ore with addition of char particle type phosphoric acid preparation system and method.This system includes: material processing device, preheats, reduce and oxidation unit, dust arrester and hydrating apparatus；Described preheating, reduction and oxidation unit include: the most adjacent feed zone, drying tube preheating zone, burner on sidewall reducing zone, furnace roof zoneofoxidation and discharge zone；Described dust arrester includes: containing P2O5Smoke inlet, containing P2O5Clean gas outlet and dust outlet；Described hydrating apparatus includes: containing P2O5Purify gas entrance, phosphoric acid outlet.This system uses with addition of char particle, improve carbon content in mixture, reduce carbon scaling loss in phosphorus ore compound, improve Phosphate ore reduction rate, widen raw material and utilize condition, mid low grade phosphate rock can be used, there is the advantages such as handling process is short, equipment investment is low, equipment operation rate is high, energy consumption is low, have wide range of applications.
Description
Technical field
The invention belongs to technical field of phosphorous chemical industry, be specifically related to a kind of wet lump ore with addition of char particle type phosphoric acid preparation system and side
Method.
Background technology
The industrialized preparing process of phosphoric acid mainly has following several: (1) phosphoric acid by wet process: produce phosphorus with sulfuric acid decomposition rock phosphate in powder
Acid, the method needs a large amount of high-quality rocks phosphate in powder and sulphuric acid, produces a large amount of phosphogypsum slag simultaneously.(2) thermal phosphoric acid: use electric furnace process
Producing yellow phosphorus, then burning absorbs preparing phosphoric acid, and the method needs a large amount of electric energy and middle high-grade phosphorus ore lump ore.(3) new kiln
Method phosphoric acid process: produce a good thinking of high-quality phosphoric acid, it is simply that Phosphate ore reduction and oxidation knot can be got up, by the heat of oxidation
Pass to the reduzate bed of material, thus reduce or production process energy consumption, the tackling key problem of this Technology it is crucial that should by the reduction of phosphorus and
The different region of oxidation reaction the two atmosphere requirements effectively isolates and does not hinder heat transfer each other and mass transfer, current kiln
The research of method phosphoric acid uses capital equipment to be tunnel cave and rotary kiln.The document of Chinese patent CN200610018780.8 discloses one
Plant and by mixing, added water by addition Cab-O-sil, coke powder (or colliery powder), kaolin powder in phosphorus mine tailing, old, use vacuum
Extruder or brick machine production line molding, soak glaze after drying, kiln loading vehicle enters tunnel cave.Preheated, heat up after obtain phosphorous vapor and
Carbon monoxide, then obtain strong phosphoric acid through hydrated tower suction, fragment of brick is as bearing bricks product after heat exchange cools down, and the present invention utilizes
Mine and rejects antacid, brickmaking, be utilization of three wastes project；The document of Chinese patent CN93111447.0 discloses one will
Rock phosphate in powder, Silicon stone, carbonaceous reducing agent adding additives make two-layer compound pelletizing, control internal layer pelletizing CaO/SiO ＜ 0.6 or ＞
6.5l, makes the pelletizing fusing point carbon thermal reduction temperature higher than phosphorus ore, and outer layer pelletizing is carbonaceous material, in order to protect in internal layer pelletizing
Carbon prematurely aoxidizes in flame furnace, is supplied to maintain the energy of flame furnace temperature simultaneously as fuel.But existing kiln-process phosphoric acid
Technique reduction is difficult to control to oxidizing atmosphere, and Phosphate ore reduction rate is low, along with day by day exhausted, the dilution of phosphate rock resource, production cost
More and more higher, therefore, how to develop a kind of raw material of can widening and utilize condition, reduce power consumption, the system of raising added value of product
The system and method for standby phosphoric acid becomes this area and needs badly and solve the technical problem that.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, it is proposed that a kind of wet lump ore is with addition of char particle type phosphoric acid preparation system and side
Method.This system utilizes phosphorus ore, reduction coal, char particle and Silicon stone for raw material by improving mode of heating and furnace atmosphere in rotary hearth furnace,
Pressure ball before decreasing rotary hearth furnace on the premise of not affecting product index and raw material stoving technique, shorten technological process,
Reducing equipment investment, it is excellent to have that handling process is short, equipment investment is low, equipment operation rate is high, energy consumption is low, have wide range of applications etc.
Point.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
The present invention proposes a kind of wet lump ore with addition of char particle type phosphoric acid preparation system.According to embodiments of the invention, this system bag
Include: material processing device, preheat, reduce and oxidation unit, dust arrester and hydrating apparatus, wherein: described material processing device,
It is made up of the breaker being sequentially connected with, screening plant and mixing arrangement, there is phosphorus ore entrance, reduction coal entrance, Silicon stone entrance,
Char particle entrance and mixed material outlet, for by phosphorus ore, reduction coal, Silicon stone and char particle through broken, sieve after in proportion dispensing mix
Even, in order to obtain mixed material；Described preheating, reduction and oxidation unit are improved rotary hearth furnace, including: the most adjacent enters
Material district, drying tube preheating zone, burner on sidewall reducing zone, furnace roof zoneofoxidation and discharge zone, wherein, described drying tube preheating zone and institute
State and between burner on sidewall reducing zone, be provided with partition wall, between described burner on sidewall reducing zone and described discharge zone, be provided with barricade, described
Partition wall and barricade are downwardly extended by the roof of described rotary hearth furnace, and and the cloth ring-shaped furnace bottom of described rotary hearth furnace keep certain between
Every；Wherein, described drying tube is arranged on the furnace wall sidewall of described drying tube preheating zone, for entering described drying tube preheating zone
Row heating；Described burner on sidewall reducing zone is provided with multiple burner inside furnace wall, for burning described burner on sidewall reducing zone
Mouth mode heats；Described feed zone is provided with mixed material entrance, and described discharge zone is provided with slag outlet, described drying tube preheating zone
Furnace wall is provided with containing P2O5Exhanst gas outlet, described mixed material entrance exports with the mixed material of described material processing device and is connected,
To obtain containing P after preheated, reduction reaction, oxidation reaction in mixed material is distributed into successively rotary hearth furnace2O5Flue gas；Institute
State dust arrester to include: containing P2O5Smoke inlet, containing P2O5Clean gas outlet and dust outlet, described containing P2O5Smoke inlet and institute
State preheating, reduction and oxidation unit containing P2O5Exhanst gas outlet is connected, for containing P2O5Flue gas processes through described dust arrester
After, obtain containing P2O5Purify gas；Described hydrating apparatus includes: containing P2O5Purify gas entrance, phosphoric acid outlet, described containing P2O5Purify gas
Entrance and described dust arrester containing P2O5Clean gas outlet is connected, for containing P2O5Purification gas, after aquation absorbs, obtains phosphorus
Acid.
Inventor finds, this system according to embodiments of the present invention, objectionable such as mechanical water, carbonic acid in mixed material
Salt, water of crystallization, arsenic etc. affect phosphoric acid production cost and production efficiency, and that can effectively remove in phosphorus ore after preheated process is bad miscellaneous
Matter, and mixed material can not drying directly enter stove reduce equipment investment；And use with addition of char particle, improve carbon in mixture and contain
Amount, can eliminate the unnecessary oxygen in material district at reduction reaction earlier part oxidation of coal, owing to carbon excess oxygen is melted into reducibility gas CO, soon
Speed realizes material district reducing atmosphere, reduces carbon scaling loss in phosphorus ore compound, improves Phosphate ore reduction rate, widens raw material and utilize bar
Part, can use mid low grade phosphate rock；Setting up drying tube preheating zone in this external rotary hearth furnace, this drying tube is arranged at furnace wall sidewall,
Use heat radiation mode preheating material, compared with the mode that conventional rotary hearth furnace all uses furnace wall burner on sidewall to heat, effectively solve
Material enters the problem that the stove initial stage causes burner to block because of powder more, decreases the pressure ball before rotary hearth furnace and raw material stoving work
Skill, shortens technological process, reduces equipment investment, has that handling process is short, equipment investment is low, equipment operation rate is high, energy consumption
The advantage such as low, to have wide range of applications.
According to embodiments of the invention, the horizontal cross-section of described preheating, reduction and oxidation unit is annular, described dry
Pipe preheating zone annulus angle is 30 °-100 °.
In another aspect of the present invention, the invention provides a kind of side utilizing foregoing system to prepare phosphoric acid
Method.According to embodiments of the invention, the method comprises the following steps: (1) Feedstock treating: by wet for phosphorus ore piece, reduction coal, Silicon stone and
Char particle is dispensing mixing in proportion after crushing, sieving, and obtains mixed material；(2) preheat, reduce and oxidation processes: by mixture
Material cloth in pre-thermal reduction and oxidation unit, along with described pre-thermal reduction and the operating of oxidation unit furnace bottom, described mixture
Material is dried successively in drying tube preheating zone, the pre-heat treatment, then carries out also in the reduction of described burner on sidewall and zoneofoxidation
Former and oxidation reaction, reaction obtains containing P after terminating2O5Flue gas；(3) dedusting and hydration process: by produce containing P2O5Flue gas is through removing
Dirt, aquation absorb, and obtain high concentration phosphorus acid product, and the slag after cooling can be used as cement producting material.
According to embodiments of the invention, wet piece of 100 weight portions of phosphorus ore, reduction coal 15-30 weight portion, Silicon stone 20-50 weight
Part, char particle 5-10 weight portion.
According to embodiments of the invention, the drying tube preheating zone temperature of described preheating, reduction and oxidation unit is 500 DEG C-
900 DEG C, the time is 20-40min；Described reducing zone uses burner on sidewall mode of heating, and reduction temperature is 1150 DEG C-1350 DEG C,
Time is 20-50min.
The present invention at least has the advantages that
1., compared with the mode that conventional rotary hearth furnace all uses furnace wall burner on sidewall to heat, in the rotary hearth furnace of the present invention, set up drying tube
Preheating zone, efficiently solves the problem that material enters the stove initial stage and causes burner to block because of powder more.
2. the present invention is by with addition of char particle, improves Phosphate ore reduction rate, utilizes the phosphorus ore of middle-low grade, widens raw material and utilizes
Condition, realizes Phosphate ore reduction, oxidation reaction is carried out in same stove simultaneously, the heat radiation-curable supply reduction that oxidation reaction produces
During institute's calorific requirement, effectively reduce external world's supply energy consumption, reduce energy consumption.
3. the present invention is without using drying, pelletizing operation, uses wet block to be sent directly into rotary hearth furnace and processes, shortens technique
Flow process, reduces equipment investment, production cost and energy consumption.
4. use with addition of char particle, improve carbon content in mixture, material can be eliminated at reduction reaction earlier part oxidation of coal
The unnecessary oxygen in district, owing to carbon excess oxygen is melted into reducibility gas CO, quickly realizes material district reducing atmosphere, reduces phosphorus ore compound
Interior carbon scaling loss, improves Phosphate ore reduction rate, has widened raw material and has utilized condition, can use mid low grade phosphate rock.
Rotary hearth furnace the most of the present invention uses regenerative combustion technology, uses poor quality or low-rank fuel, reduces fuel cost,
Can promote with the area lacking natural gas and high-grade fuel at home.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that the present invention transforms rotary hearth furnace.
Fig. 2 is the method flow diagram that the present invention prepares phosphoric acid.
Fig. 3 is the system simple diagram that the present invention prepares phosphoric acid.
Wherein, feed zone 1, drying tube preheating zone 2, burner on sidewall reducing zone 3, discharge zone 4, flue 5, partition wall 6, barricade 7,
Drying tube 8, burner 9, material processing device S100, phosphorus ore entrance 101, reduction coal entrance 102, Silicon stone entrance 103, char particle enters
Mouth 104, mixed material outlet 105, preheat, reduce and oxidation unit S200, mixed material entrance 201, containing P2O5Exhanst gas outlet
202, slag outlet 203, dust arrester S300, containing P2O5Smoke inlet 301, containing P2O5Clean gas outlet 302, dust outlet
303, hydrating apparatus S400, containing P2O5Purify gas entrance 401, phosphoric acid outlet 402.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that technical scheme, below in conjunction with specific embodiment to this
Invention is described in further detail.The embodiments described below is exemplary, is only used for explaining the present invention, and is not understood that
For limitation of the present invention.
The present invention proposes a kind of wet lump ore with addition of char particle type phosphoric acid preparation system.According to embodiments of the invention, Fig. 1
Transform the schematic diagram of rotary hearth furnace for the present invention, Fig. 3 is the system simple diagram that the present invention prepares phosphoric acid, shown in reference Fig. 1 and Fig. 3,
This system includes: material processing device S100, preheats, reduce and oxidation unit S200, dust arrester S300 and hydrating apparatus
S400, wherein: described material processing device has phosphorus ore entrance 101, reduction coal entrance 102, Silicon stone entrance 103, char particle entrance
104 and mixed material outlet 105, for just phosphorus ore, reduction coal, Silicon stone and char particle after broken, screening in proportion dispensing mixed
Even, in order to obtain mixed material；Described preheating, reduction and oxidation unit include: the most adjacent feed zone 1, drying tube preheat
District 2, burner on sidewall reducing zone 3 and discharge zone 4, wherein, set between described drying tube preheating zone and described burner on sidewall reducing zone
There is partition wall 6, be provided with 7 barricades, described partition wall and barricade between described burner on sidewall reducing zone and described discharge zone by described turn
The roof of end stove downwardly extends, and keeps certain intervals with the cloth ring-shaped furnace bottom of described rotary hearth furnace；Wherein, described drying tube sets
8 put on the furnace wall sidewall of described drying tube preheating zone, for heating described drying tube preheating zone；Described burner on sidewall
Multiple burner 9 it is provided with, for described burner on sidewall reducing zone is carried out burner mode heating inside furnace wall, reducing zone；Described charging
District is provided with mixed material entrance 201, and described discharge zone is provided with slag outlet 203, and furnace wall, described drying tube preheating zone is provided with and contains
P2O5Exhanst gas outlet 202, described mixed material entrance exports with the mixed material of described material processing device and is connected, for mixing
Compound material is preheated in being distributed into rotary hearth furnace successively, after reduction reaction, oxidation reaction to obtain containing P2O5Flue gas.
Inventor finds, this system according to embodiments of the present invention, objectionable such as mechanical water, carbonic acid in mixed material
Salt, water of crystallization, arsenic etc. affect phosphoric acid production cost and production efficiency, and that can effectively remove in phosphorus ore after preheated process is bad miscellaneous
Matter, and mixed material can not drying directly enter stove reduce equipment investment；And use with addition of char particle, improve carbon in mixture and contain
Amount, can eliminate the unnecessary oxygen in material district at reduction reaction earlier part oxidation of coal, owing to carbon excess oxygen is melted into reducibility gas CO, soon
Speed realizes material district reducing atmosphere, reduces carbon scaling loss in phosphorus ore compound, improves Phosphate ore reduction rate, widens raw material and utilize bar
Part, can use mid low grade phosphate rock；Setting up drying tube preheating zone in this external rotary hearth furnace, this drying tube is arranged at furnace wall sidewall,
Use heat radiation mode preheating material, compared with the mode that conventional rotary hearth furnace all uses furnace wall burner on sidewall to heat, effectively solve
Material enters the problem that the stove initial stage causes burner to block because of powder more, decreases the pressure ball before rotary hearth furnace and raw material stoving work
Skill, shortens technological process, reduces equipment investment, has that handling process is short, equipment investment is low, equipment operation rate is high, energy consumption
The advantage such as low, to have wide range of applications.
According to embodiments of the invention, described material processing device, by the breaker being sequentially connected with, screening plant and mixed
Locking device forms.
According to embodiments of the invention, the concrete kind of described breaker is unrestricted, as long as can reach bulk
Material is broken into the effect of suitable particle size, can be metal breaker, stone breaker, hogging device or mould
Material breaker, according to some embodiments of the present invention, the present invention is preferably metal breaker or stone breaker.
According to embodiments of the invention, the concrete kind of described screening plant and method are unrestricted, as long as can play
With compass screen surface with holes, mixed materials different for granule size is divided into the effect of various granularity level, can be revolving screen or
Shaking screen, independent screening, auxiliary screening or dehydration screening, according to some embodiments of the present invention, the present invention is preferably revolving screen
Or auxiliary screening.
According to embodiments of the invention, described preheating, reduction and oxidation unit are improved rotary hearth furnace, wherein said turn
The model of end stove is unrestricted, can be heat accumulating type or non-regenerative rotary hearth furnace, according to some embodiments of the present invention, this
Bright preferably regenerative rotary hearth furnace.
According to embodiments of the invention, the concrete shape of the horizontal cross-section of described preheating, reduction and oxidation unit is unrestricted
System, the present invention is preferably annular, and described drying tube preheating zone annulus angle is preferably 30 °-100 °.Rotary hearth furnace of the present invention is dried
Pipe preheating zone annulus angle is no less than 30 °, if annulus angle is less than 30 °, then material is the shortest at preheating zone remaining time, can lead
Causing phosphorus ore moisture removal incomplete, in reducing zone, removing affects material district reproducibility to residual moisture, reduces the reduction of valuable metal
Rate, but affect the reduction effect of reducing zone material when rotary hearth furnace preheating zone annulus angle crosses senior general, so controlling preheating zone annulus
Angle is not more than 100 °.
According to embodiments of the invention, the partition wall being provided with between described drying tube preheating zone and described burner on sidewall reducing zone
Concrete material unrestricted, as long as the effect of separation can be played, can be refractory brick or fire-resistant stamp mass etc., according to
Some embodiments of the present invention, the present invention is preferably refractory brick.
According to embodiments of the invention, the barricade being provided with between described burner on sidewall reducing zone and described discharge zone concrete
Material is unrestricted, as long as the effect of stop can be played, can be refractory brick or fire-resistant stamp mass etc., according to the present invention
Some embodiments, the present invention is preferably refractory brick.
According to embodiments of the invention, described burner on sidewall reducing zone is provided with the concrete kind of multiple burner and shape is not subject to
Limiting, heating as long as can be used in that described burner on sidewall reducing zone is carried out burner mode.
According to embodiments of the invention, the concrete shape of described drying tube is unrestricted, can be U-shaped, W shape or p-shaped, root
According to some embodiments of the present invention, the present invention is preferably U-shaped.
According to embodiments of the invention, with reference to shown in Fig. 3, described dust arrester includes: containing P2O5Smoke inlet 301, contain
P2O5Clean gas outlet 302 and dust outlet 303, described containing P2O5Smoke inlet contains with described preheating, reduction and oxidation unit
P2O5Exhanst gas outlet is connected, for containing P2O5Flue gas, after described dust arrester processes, obtains containing P2O5Purify gas.
According to embodiments of the invention, with reference to shown in Fig. 3, described hydrating apparatus includes: containing P2O5Purify gas entrance 401, phosphorus
Acid outlet 402, described containing P2O5Purify gas entrance and described dust arrester containing P2O5Clean gas outlet is connected, for containing P2O5
Purification gas, after aquation absorbs, obtains phosphoric acid.
In another aspect of the present invention, the invention provides a kind of side utilizing foregoing system to prepare phosphoric acid
Method.Fig. 2 is the method flow diagram that the present invention prepares phosphoric acid, and with reference to shown in Fig. 2, the method may comprise steps of:
(1) Feedstock treating: by the dispensing mixing in proportion after crushing, sieving of wet for phosphorus ore piece, reduction coal, Silicon stone and char particle, obtain
Mixed material.
According to embodiments of the invention, wet piece of 100 weight portions of phosphorus ore, reduction coal 15-30 weight portion, Silicon stone 20-50 weight
Part, char particle 5-10 weight portion.
According to embodiments of the invention, described material processing device, by the breaker being sequentially connected with, screening plant and mixed
Locking device forms, and described material processing device has phosphorus ore entrance 101, reduction coal entrance 102, Silicon stone entrance 103, char particle entrance
104 and mixed material outlet 105, for just phosphorus ore, reduction coal, Silicon stone and char particle after broken, screening in proportion dispensing mixed
Even, in order to obtain mixed material.
In raw material control allocate into suitable Silicon stone amount make calcium monofluorophosphate. and carbon react reduce generation CaO immediately with addition
SiO2Reaction generates calcium silicates, thus effectively reduces the reduction temperature of calcium monofluorophosphate. so that reduction reaction is in relatively low temperature
Under also can carry out, additionally, allocate SiO into2Raw material fusing point can be made to be higher than the carbon thermal reduction temperature of rock phosphate in powder in raw material, thus reduce
Energy consumption, it is ensured that produce direct motion.
Use with addition of char particle, improve carbon content in mixture, material district can be eliminated at reduction reaction earlier part oxidation of coal
Unnecessary oxygen, owing to carbon excess oxygen is melted into reducibility gas CO, quickly realizes material district reducing atmosphere, reduces in phosphorus ore compound
Carbon scaling loss, improves Phosphate ore reduction rate, widens raw material and utilize condition, can use mid low grade phosphate rock.
(2) preheat, reduce and oxidation processes: by mixed material cloth in pre-thermal reduction and oxidation unit, along with described
Pre-thermal reduction and the operating of oxidation unit furnace bottom, described mixed material is dried successively in drying tube preheating zone, at preheating
Reason, then carry out reducing and oxidation reaction in the reduction of described burner on sidewall and zoneofoxidation, reaction obtains containing P after terminating2O5Flue gas.
According to embodiments of the invention, the drying tube preheating zone temperature of described preheating, reduction and oxidation unit is 500 DEG C-
900 DEG C, the time is 20-40min；Described reducing zone uses burner on sidewall mode of heating, and reduction temperature is 1150 DEG C-1350 DEG C,
Time is 20-50min.
According to embodiments of the invention, described preheating, reduction and oxidation unit include: the most adjacent feed zone 1, be dried
Pipe preheating zone 2, burner on sidewall reducing zone 3 and discharge zone 4, described feed zone is provided with mixed material entrance 201, and described discharge zone sets
Slag outlet 203, furnace wall, described drying tube preheating zone is had to be provided with containing P2O5Exhanst gas outlet 202, described mixed material entrance and institute
The mixed material outlet stating material processing device is connected, preheated in mixed material is distributed into rotary hearth furnace successively, reduction is anti-
Should, after oxidation reaction to obtain containing P2O5Flue gas.
Mixed material material reducing zone occur reduction reaction produce phosphorous vapor, by control air-fuel ratio make stove top in
Weak oxide atmosphere, does not the most destroy the reducing atmosphere in material district, and reducing zone gained phosphorous vapor occurs oxidation anti-in furnace roof zoneofoxidation
Should, it is achieved Phosphate ore reduction, oxidation reaction are carried out in same stove, in the heat radiation-curable supply reduction process that oxidation reaction produces
Institute's calorific requirement, reduce because adjusting air-fuel ratio and the furnace temperature fluctuation that brings, effectively reduce external world's supply energy consumption, reduce and produce energy
Consumption.
(3) dedusting and hydration process: by produce containing P2O5Flue gas removing dust, aquation absorb, and obtain high-concentration phosphoric acid and produce
Product, the slag after cooling can be used as cement producting material.
According to embodiments of the invention, with reference to shown in Fig. 3, described dust arrester includes: containing P2O5Smoke inlet 301, contain
P2O5Clean gas outlet 302 and dust outlet 303, described containing P2O5Smoke inlet contains with described preheating, reduction and oxidation unit
P2O5Exhanst gas outlet is connected, for containing P2O5Flue gas, after described dust arrester processes, obtains containing P2O5Purify gas.
According to embodiments of the invention, with reference to shown in Fig. 3, described hydrating apparatus includes: containing P2O5Purify gas entrance 401, phosphorus
Acid outlet 402, described containing P2O5Purify gas entrance and described dust arrester containing P2O5Clean gas outlet is connected, for containing P2O5
Purification gas, after aquation absorbs, obtains phosphoric acid.
Embodiment 1:
By wet for phosphorus ore piece: reduction coal: Silicon stone: char particle according to proportioning is: 100:15:20:5 mixes, gained mixed material is even
Continue and be distributed in rotary hearth furnace, preheating zone temperature 500 DEG C, 40 minutes time, reduction temperature 1150 DEG C, 50 minutes time, preheating zone
Annulus angle is 30 °, in stove phosphorus ore reduce, produced containing P after oxidation reaction2O5Flue gas is after flue is discharged, through clean
Finally giving the phosphoric acid product of acid concentration 85% after change, aquation, the high temperature furnace slag discharged from discharge gate is pre-through air heat-exchanging device
Can use as combustion air after hot-air, the slag after cooling can be used as cement producting material.
Embodiment 2:
By wet for phosphorus ore piece: reduction coal: Silicon stone: char particle according to proportioning is: 100:20:35:8 mixes, gained mixed material is even
Continue and be distributed in rotary hearth furnace, preheat temperature 600 DEG C, 30 minutes time, reduction temperature 1250 DEG C, 40 minutes time, the circle of preheating zone
Ring angle is 60 °, in stove phosphorus ore reduce, produced containing P after oxidation reaction2O5Flue gas through flue discharge after, purified,
Finally giving the phosphoric acid product of acid concentration 88% after aquation, the high temperature furnace slag discharged from discharge gate preheats through air heat-exchanging device
Can use as combustion air after air, the slag after cooling can be used as cement producting material.
Embodiment 3:
By wet for phosphorus ore piece: reduction coal: Silicon stone: char particle according to proportioning is: 100:30:50:10 mixes, gained mixed material is even
Continue and be distributed in rotary hearth furnace, preheat temperature 900 DEG C, 20 minutes time, reduction temperature 1350 DEG C, 20 minutes time, the circle of preheating zone
Ring angle is 100 °, in stove phosphorus ore reduce, produced containing P after oxidation reaction2O5Flue gas through flue discharge after, purified,
Finally giving the phosphoric acid product of acid concentration 89% after aquation, the high temperature furnace slag discharged from discharge gate preheats through air heat-exchanging device
Can use as combustion air after air, the slag after cooling can be used as cement producting material.
Inventor finds, this system according to embodiments of the present invention, objectionable such as mechanical water, carbonic acid in mixed material
Salt, water of crystallization, arsenic etc. affect phosphoric acid production cost and production efficiency, and that can effectively remove in phosphorus ore after preheated process is bad miscellaneous
Matter, and mixed material can not drying directly enter stove reduce equipment investment；And use with addition of char particle, improve carbon in mixture and contain
Amount, can eliminate the unnecessary oxygen in material district at reduction reaction earlier part oxidation of coal, owing to carbon excess oxygen is melted into reducibility gas CO, soon
Speed realizes material district reducing atmosphere, reduces carbon scaling loss in phosphorus ore compound, improves Phosphate ore reduction rate, widens raw material and utilize bar
Part, can use mid low grade phosphate rock；Setting up drying tube preheating zone in this external rotary hearth furnace, this drying tube is arranged at furnace wall sidewall,
Use heat radiation mode preheating material, compared with the mode that conventional rotary hearth furnace all uses furnace wall burner on sidewall to heat, effectively solve
Material enters the problem that the stove initial stage causes burner to block because of powder more, decreases the pressure ball before rotary hearth furnace and raw material stoving work
Skill, shortens technological process, reduces equipment investment, has that handling process is short, equipment investment is low, equipment operation rate is high, energy consumption
The advantage such as low, to have wide range of applications.
In the description of this specification, reference term " embodiment ", " some embodiments ", " illustrative examples ",
The description of " example ", " concrete example " or " some examples " etc. means to combine this embodiment or the specific features of example description, knot
Structure, material or feature are contained at least one embodiment or the example of the present invention.In this manual, to above-mentioned term
Schematic representation is not necessarily referring to identical embodiment or example.And, the specific features of description, structure, material or spy
Point can combine in any one or more embodiments or example in an appropriate manner.
In describing the invention, it is to be understood that term " first ", " second " are only used for describing purpose, and can not
It is interpreted as instruction or hint relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " the
One ", the feature of " second " can express or implicitly include one or more this feature.In describing the invention,
Except as otherwise noted, " multiple " are meant that two or more.
In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " is installed ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be fixing connection, it is also possible to be to removably connect, or be integrally connected；Can
To be mechanical connection, it is also possible to be a connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, can understand that above-mentioned term is at this with concrete condition
Concrete meaning in invention.
Although above it has been shown and described that embodiments of the invention, it is to be understood that above-described embodiment is example
Property, it is impossible to being interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, revises, replaces and modification, simultaneously for one of ordinary skill in the art, according to the think of of the application
Think, the most all will change.
Claims (5)
1. a wet lump ore is with addition of char particle type phosphoric acid preparation system, it is characterised in that including: material processing device, preheats, reduce
And oxidation unit, dust arrester and hydrating apparatus, wherein:
Described material processing device, is made up of the breaker being sequentially connected with, screening plant and mixing arrangement, has phosphorus ore and enters
Mouthful, reduction coal entrance, Silicon stone entrance, char particle entrance and mixed material outlet, for by phosphorus ore, reduction coal, Silicon stone and char particle warp
Dispensing mixing in proportion after broken, screening, in order to obtain mixed material；
Described preheating, reduction and oxidation unit are improved rotary hearth furnace, including: the most adjacent feed zone, drying tube preheat
District, burner on sidewall reducing zone, furnace roof zoneofoxidation and discharge zone, wherein, described drying tube preheating zone is reduced with described burner on sidewall
Be provided with partition wall between district, be provided with between described burner on sidewall reducing zone and described discharge zone barricade, described partition wall and barricade by
The roof of described rotary hearth furnace downwardly extends, and keeps certain intervals with the cloth ring-shaped furnace bottom of described rotary hearth furnace；
Wherein, described drying tube is arranged on the furnace wall sidewall of described drying tube preheating zone, for described drying tube preheating zone
Heat；Described burner on sidewall reducing zone is provided with multiple burner inside furnace wall, for carrying out described burner on sidewall reducing zone
Burner mode heats；Described feed zone is provided with mixed material entrance, and described discharge zone is provided with slag outlet, and described drying tube preheats
Furnace wall, district is provided with containing P2O5Exhanst gas outlet, described mixed material entrance exports phase with the mixed material of described material processing device
Even, to obtain containing P after preheated in mixed material is distributed into successively rotary hearth furnace, reduction reaction, oxidation reaction2O5Flue gas；
Described dust arrester includes: containing P2O5Smoke inlet, containing P2O5Clean gas outlet and dust outlet, described containing P2O5Flue gas enters
Mouthful with described preheating, reduction and oxidation unit containing P2O5Exhanst gas outlet is connected, for containing P2O5Flue gas is through described dust arrester
After process, obtain containing P2O5Purify gas；
Described hydrating apparatus includes: containing P2O5Purify gas entrance, phosphoric acid outlet, described containing P2O5Purify gas entrance to fill with described dedusting
Put containing P2O5Clean gas outlet is connected, for containing P2O5Purification gas, after aquation absorbs, obtains phosphoric acid.
System the most according to claim 1, it is characterised in that the horizontal cross-section of described preheating, reduction and oxidation unit is
Annular, described drying tube preheating zone annulus angle is 30 °-100 °.
3. one kind utilizes the method that the system described in claim 1 or 2 prepares phosphoric acid, it is characterised in that comprise the following steps:
(1) Feedstock treating: by dispensing mixing in proportion after wet for phosphorus ore piece, reduction coal, Silicon stone and char particle drying, broken, screening,
Obtain mixed material；
(2) preheat, reduce and oxidation processes: by mixed material cloth in pre-thermal reduction and oxidation unit, along with described preheating
Reduction and the operating of oxidation unit furnace bottom, described mixed material is dried successively in drying tube preheating zone, the pre-heat treatment, then
Carrying out reducing and oxidation reaction in the reduction of described burner on sidewall and zoneofoxidation, reaction obtains containing P after terminating2O5Flue gas；
(3) dedusting and hydration process: by produce containing P2O5Flue gas removing dust, aquation absorb, and obtain high concentration phosphorus acid product, cold
But the slag after can be used as cement producting material.
Method the most according to claim 3, it is characterised in that wet piece of 100 weight portions of phosphorus ore, reduction coal 15-30 weight portion,
Silicon stone 20-50 weight portion, char particle 5-10 weight portion.
Method the most according to claim 3, it is characterised in that the drying tube preheating of described preheating, reduction and oxidation unit
District's temperature is 500 DEG C-900 DEG C, and the time is 20-40min；Described reducing zone uses burner on sidewall mode of heating, and reduction temperature is
1150 DEG C-1350 DEG C, the time is 20-50min.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS518119B1 (en) * | 1969-02-26 | 1976-03-13 | ||
| CN101033061A (en) * | 2006-09-30 | 2007-09-12 | 湖北三新磷酸有限公司 | Method of producing phosphoric acid by directly reducing phosphorus ore and co-producing Portland cement grog |
| CN101143717A (en) * | 2007-08-24 | 2008-03-19 | 四川大学 | Method for producing phosphoric acid from middle and low grade phosphorus ore by kiln method and actualizing device thereof |
| CN206069375U (en) * | 2016-09-13 | 2017-04-05 | 江苏省冶金设计院有限公司 | A kind of wet lump ore is with addition of char particle type phosphoric acid preparation system |
-
2016
- 2016-09-13 CN CN201610818998.5A patent/CN106241759A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS518119B1 (en) * | 1969-02-26 | 1976-03-13 | ||
| CN101033061A (en) * | 2006-09-30 | 2007-09-12 | 湖北三新磷酸有限公司 | Method of producing phosphoric acid by directly reducing phosphorus ore and co-producing Portland cement grog |
| CN101143717A (en) * | 2007-08-24 | 2008-03-19 | 四川大学 | Method for producing phosphoric acid from middle and low grade phosphorus ore by kiln method and actualizing device thereof |
| CN206069375U (en) * | 2016-09-13 | 2017-04-05 | 江苏省冶金设计院有限公司 | A kind of wet lump ore is with addition of char particle type phosphoric acid preparation system |
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