CN206069375U - A kind of wet lump ore is with addition of char particle type phosphoric acid preparation system - Google Patents
A kind of wet lump ore is with addition of char particle type phosphoric acid preparation system Download PDFInfo
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Abstract
This utility model belongs to technical field of phosphorous chemical industry, and in particular to a kind of wet lump ore is with addition of char particle type phosphoric acid preparation system.The system includes：Material processing device, preheating, reduction and oxidation unit, dust arrester and hydrating apparatus；The preheating, reduction and oxidation unit include：Adjacent feed zone, drying tube preheating zone, burner on sidewall reducing zone, furnace roof zoneofoxidation and discharge zone successively；The dust arrester includes：Containing P2O5Smoke inlet, containing P2O5Clean gas outlet and dust outlet；The hydrating apparatus include：Containing P2O5Purified gas entrance, phosphoric acid outlet.The system is using 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, had the advantages that handling process is short, equipment investment is low, equipment operation rate is high, energy consumption is low, had wide range of applications.
Description
Technical field
This utility model belongs to technical field of phosphorous chemical industry, and in particular to a kind of wet lump ore prepares with addition of char particle type phosphoric acid and is
System.
Background technology
The industrialized preparing process of phosphoric acid mainly has following several：(1) phosphoric acid by wet process：Phosphorus is produced with sulfuric acid decomposition rock phosphate in powder
Acid, the method need a large amount of high-quality rocks phosphate in powder and sulphuric acid, while producing a large amount of phosphogypsum slags.(2) thermal phosphoric acid：Use electric furnace process
Production yellow phosphorus, then burning absorb 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：Phosphate ore reduction and oxidation knot can exactly be got up, by the heat of oxidation by one good thinking of production high-quality phosphoric acid
Pass to the reduzate bed of material, so as to reduce or production process energy consumption, the key of Technology tackling key problem be should by the reduction of phosphorus and
Effective isolation without prejudice to heat transfer each other and the mass transfer again in the different region of the two atmosphere requirements of oxidation reaction, current kiln
The research of method phosphoric acid adopts capital equipment for tunnel cave and rotary kiln.The document of Chinese patent CN200610018780.8 discloses one
Plant by adding Cab-O-sil, coke powder (or colliery powder), Kaolin powder by mixing in phosphorus mine tailing, add water, it is old, use vacuum
Extruder or brick machine production line molding, soak glaze after drying, kiln loading vehicle enters tunnel cave.It is preheated, heat up after obtain phosphorous vapor and
Carbon monoxide, then strong phosphoric acid is obtained through hydrated tower suction, fragment of brick is after heat exchange cooling as load-bearing brick product, this utility model
Using mine and rejects antacid, brickmaking, it is utilization of three wastes project；The document of Chinese patent CN93111447.0 discloses one
Kind rock phosphate in powder, Silicon stone, carbonaceous reducing agent adding additives are made into two-layer compound pelletizing, control internal layer pelletizing CaO/SiO ＜ 0.6 or
＞ 6.5l, make carbon thermal reduction temperature of the pelletizing fusing point higher than phosphorus ore, and outer layer pelletizing is carbonaceous material, to protect in internal layer pelletizing
Carbon prematurely aoxidize in flame furnace, while as fuel be supplied to maintain flame furnace temperature energy.But existing kiln method phosphorus
Sour technique reduction is difficult to control to oxidizing atmosphere, and Phosphate ore reduction rate is low, with increasingly depleted, the dilution of phosphate rock resource, produces into
This more and more higher, therefore, how to develop a kind of raw material of can widening and consume energy, improve added value of product using condition, reduction
The system for preparing phosphoric acid becomes the technical problem of this area urgent need to resolve.
Utility model content
This utility model 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.
The system using phosphorus ore, reduction coal, char particle and Silicon stone be raw material by improving mode of heating and furnace atmosphere in rotary hearth furnace, not
Pressure ball and raw material stoving technique before rotary hearth furnace are reduced on the premise of affecting product index, technological process is shortened, is reduced
Equipment investment, has the advantages that handling process is short, equipment investment is low, equipment operation rate is high, energy consumption is low, has wide range of applications.
To solve above-mentioned technical problem, the technical solution adopted in the utility model is：
The utility model proposes a kind of wet lump ore is with addition of char particle type phosphoric acid preparation system.According to enforcement of the present utility model
Example, the system include：Material processing device, preheating, reduction and oxidation unit, dust arrester and hydrating apparatus, wherein：The original
Material processing device, is made up of the breaker, screening plant and mixing arrangement that are sequentially connected, and with phosphorus ore entrance, reduction coal enters
Mouthful, the outlet of Silicon stone entrance, char particle entrance and mixed material, for by phosphorus ore, reduction coal, Silicon stone and char particle Jing after broken, screening
Dispensing is mixed in proportion, to obtain mixed material；The preheating, reduction and oxidation unit are improved rotary hearth furnace, including：
Adjacent feed zone, drying tube preheating zone, burner on sidewall reducing zone, furnace roof zoneofoxidation and discharge zone successively, wherein, the drying
Partition wall is provided between pipe preheating zone and the burner on sidewall reducing zone, is set between the burner on sidewall reducing zone and the discharge zone
There are barricade, the partition wall and barricade to be extended downwardly by the roof of the rotary hearth furnace, and the cloth annular furnace with the rotary hearth furnace
Bottom keeps certain intervals；Wherein, the drying tube is arranged on the furnace wall side wall of the drying tube preheating zone, for described dry
Heated dry pipe preheating zone；The burner on sidewall reducing zone is provided with multiple burners on the inside of furnace wall, for the burner on sidewall
Reducing zone carries out burner mode heating；The feed zone is provided with mixed material entrance, and the discharge zone is provided with slag outlet, described
Drying tube preheating zone furnace wall is provided with containing P2O5Exhanst gas outlet, the mixing of the mixed material entrance and the material processing device
Material outlet is connected, for being distributed into mixed material successively in rotary hearth furnace after preheated, reduction reaction, oxidation reaction to obtain
Containing P2O5Flue gas；The dust arrester includes：Containing P2O5Smoke inlet, containing P2O5Clean gas outlet and dust outlet, it is described containing P2O5
Smoke inlet is with the preheating, reduction and oxidation unit containing P2O5Exhanst gas outlet is connected, for containing P2O5Remove described in flue gas Jing
After the process of dirt device, obtain containing P2O5Purified gas；The hydrating apparatus include：Containing P2O5Purified gas entrance, phosphoric acid outlet, it is described
Containing P2O5Purified gas entrance is with the dust arrester containing P2O5Clean gas outlet is connected, for containing P2O5Purified gas Jing aquation is inhaled
After receipts, phosphoric acid is obtained.
Inventor has found, according to the system of this utility model embodiment, in mixed material it is objectionable as mechanical water,
Carbonate, water of crystallization, arsenic etc. affect phosphoric acid production cost and production efficiency, effectively can be removed in phosphorus ore not after preheated process
Good impurity, and mixed material can not drying directly enter stove reduce equipment investment；And using with addition of char particle, improve in mixture
Carbon content, can eliminate the unnecessary oxygen in material area in reduction reaction earlier part oxidation of coal, as carbon surplus is oxidized to reducibility gas
CO, quickly realizes material area reducing atmosphere, reduces carbon scaling loss in phosphorus ore compound, improves Phosphate ore reduction rate, widens raw material profit
With condition, mid low grade phosphate rock can be used；In addition drying tube preheating zone is set up in rotary hearth furnace, the drying tube is arranged at furnace wall side
Wall, using heat radiation mode preheating material, compared with conventional rotary hearth furnace is by the way of the heating of furnace wall burner on sidewall, effectively solves
Material of having determined enters the stove initial stage because causing the problem that burner is blocked powder more, reduces the pressure ball before rotary hearth furnace and raw material stoving work
Skill, shortens technological process, reduces equipment investment, with handling process it is short, equipment investment is low, equipment operation rate is high, energy consumption
It is low, the advantages of have wide range of applications.
According to embodiment of the present utility model, the horizontal cross-section of the preheating, reduction and oxidation unit is annular, described
Drying tube preheating zone annulus angle is 30 ° -100 °.
This utility model at least has the advantages that：
1., compared with conventional rotary hearth furnace is by the way of the heating of furnace wall burner on sidewall, increase in rotary hearth furnace of the present utility model
If drying tube preheating zone, efficiently solve the problems, such as that material enters the stove initial stage because causing powder burner to block more.
2. this utility model is by with addition of char particle, improving Phosphate ore reduction rate, using the phosphorus ore of middle-low grade, widening raw material
Using condition, while realize that Phosphate ore reduction, oxidation reaction are carried out in same stove, the radiation-curable supply of heat that oxidation reaction is produced
Institute's calorific requirement in reduction process, effectively reduces extraneous supply energy consumption, reduces energy consumption.
3. this utility model need not be sent directly into rotary hearth furnace process using wet block, shortened using drying, pelletizing operation
Technological process, reduces equipment investment, production cost and energy consumption.
4., using with addition of char particle, carbon content in mixture is improved, material can be eliminated in reduction reaction earlier part oxidation of coal
The unnecessary oxygen in area, as carbon surplus is oxidized to reducibility gas CO, quickly realizes material area 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.
5. this utility model rotary hearth furnace adopts regenerative combustion technology, using inferior or low-rank fuel, reduces fuel
Cost, can be promoted with the area for lacking natural gas and high-grade fuel at home.
Description of the drawings
Fig. 1 is the schematic diagram that this utility model transforms rotary hearth furnace.
Fig. 2 prepares the method flow diagram of phosphoric acid for this utility model.
Fig. 3 prepares the system simple diagram of phosphoric acid for this utility model.
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 entrance
104, mixed material outlet 105, preheating, reduction 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, water
S400 is put in makeup, containing P2O5Purified gas entrance 401, phosphoric acid outlet 402.
Specific embodiment
In order that those skilled in the art more fully understand the technical solution of the utility model, with reference to specific embodiment
The utility model is described in further detail.The embodiments described below is exemplary, is only used for explaining that this practicality is new
Type, and it is not intended that to restriction of the present utility model.
The utility model proposes a kind of wet lump ore is with addition of char particle type phosphoric acid preparation system.According to enforcement of the present utility model
Example, Fig. 1 transform the schematic diagram of rotary hearth furnace for this utility model, and Fig. 3 prepares the system simple diagram of phosphoric acid for this utility model, join
According to shown in Fig. 1 and Fig. 3, the system includes：Material processing device S100, preheating, reduction and oxidation unit S200, dust arrester
S300 and hydrating apparatus S400, wherein：The material processing device has a phosphorus ore entrance 101, reduction coal entrance 102, and Silicon stone enters
Mouth 103, char particle entrance 104 and mixed material outlet 105, crush for just phosphorus ore, reduction coal, Silicon stone and char particle Jing, sieve
Dispensing is mixed in proportion afterwards, to obtain mixed material；The preheating, reduction and oxidation unit include：Adjacent charging successively
Area 1, drying tube preheating zone 2, burner on sidewall reducing zone 3 and discharge zone 4, wherein, the drying tube preheating zone is burnt with the side wall
Partition wall 6 is provided between mouth reducing zone, 7 barricades between the burner on sidewall reducing zone and the discharge zone, are provided with, the partition wall and
Barricade is extended downwardly by the roof of the rotary hearth furnace, and keeps certain intervals with the cloth ring-shaped furnace bottom of the rotary hearth furnace；Its
In, the drying tube sets 8 and puts on the furnace wall side wall of the drying tube preheating zone, for carrying out adding to the drying tube preheating zone
Heat；The burner on sidewall reducing zone is provided with multiple burners 9 on the inside of furnace wall, for carrying out burner side to the burner on sidewall reducing zone
Formula is heated；The feed zone is provided with mixed material entrance 201, and the discharge zone is provided with slag outlet 203, the drying tube preheating
Area furnace wall is provided with containing P2O5Exhanst gas outlet 202, the mixed material entrance are exported with the mixed material of the material processing device
It is connected, for being distributed into mixed material successively in rotary hearth furnace after preheated, reduction reaction, oxidation reaction to obtain containing P2O5Cigarette
Gas.
Inventor has found, according to the system of this utility model embodiment, in mixed material it is objectionable as mechanical water,
Carbonate, water of crystallization, arsenic etc. affect phosphoric acid production cost and production efficiency, effectively can be removed in phosphorus ore not after preheated process
Good impurity, and mixed material can not drying directly enter stove reduce equipment investment；And using with addition of char particle, improve in mixture
Carbon content, can eliminate the unnecessary oxygen in material area in reduction reaction earlier part oxidation of coal, as carbon surplus is oxidized to reducibility gas
CO, quickly realizes material area reducing atmosphere, reduces carbon scaling loss in phosphorus ore compound, improves Phosphate ore reduction rate, widens raw material profit
With condition, mid low grade phosphate rock can be used；In addition drying tube preheating zone is set up in rotary hearth furnace, the drying tube is arranged at furnace wall side
Wall, using heat radiation mode preheating material, compared with conventional rotary hearth furnace is by the way of the heating of furnace wall burner on sidewall, effectively solves
Material of having determined enters the stove initial stage because causing the problem that burner is blocked powder more, reduces the pressure ball before rotary hearth furnace and raw material stoving work
Skill, shortens technological process, reduces equipment investment, with handling process it is short, equipment investment is low, equipment operation rate is high, energy consumption
It is low, the advantages of have wide range of applications.
According to embodiment of the present utility model, the material processing device, by the breaker, screening plant that are sequentially connected
Constitute with mixing arrangement.
According to embodiment of the present utility model, the concrete species of the breaker is unrestricted, if can reach by
Lump material is broken into the effect of suitable particle size, can be metal breaker, stone breaker, hogging device
Or plastic crushing device, according to some embodiments of the present utility model, this utility model is preferably metal breaker or stone
Breaker.
According to embodiment of the present utility model, the concrete species of the screening plant and method are unrestricted, as long as can
Play a part of granule size different mixed materials is divided into various granularity level with compass screen surface with holes, can be turn
Sieve or shaking screen, independent screening, auxiliary screening or dehydration screening, according to some embodiments of the present utility model, this utility model
Preferably revolving screen or auxiliary screening.
According to embodiment of the present utility model, the preheating, reduction and oxidation unit are improved rotary hearth furnace, wherein institute
The model for stating rotary hearth furnace is unrestricted, can be heat accumulating type or non-regenerative rotary hearth furnace, according to some realities of the present utility model
Example is applied, this utility model is preferably regenerative rotary hearth furnace.
According to embodiment of the present utility model, the concrete shape of the horizontal cross-section of the preheating, reduction and oxidation unit is not
It is restricted, this utility model is preferably annular, the drying tube preheating zone annulus angle is preferably 30 ° -100 °.This practicality is new
Type rotary hearth furnace drying tube preheating zone annulus angle is no less than 30 °, if annulus angle is less than 30 °, material is retained in preheating zone
Time is too short, can cause phosphorus ore moisture removal not exclusively, and residual moisture affects material area reproducibility in reducing zone removing, has reduced
The percent reduction of valency metal, but when rotary hearth furnace preheating zone annulus angle crosses the reduction effect of senior general's impact reducing zone material, so control
Annulus angle in preheating zone processed is not more than 100 °.
According to embodiment of the present utility model, it is provided between the drying tube preheating zone and the burner on sidewall reducing zone
The concrete material of partition wall is unrestricted, as long as separation can be played a part of, can be refractory brick or fire resisting stamp mass etc.,
According to some embodiments of the present utility model, this utility model is preferably refractory brick.
According to embodiment of the present utility model, the barricade being provided between the burner on sidewall reducing zone and the discharge zone
Concrete material is unrestricted, as long as stop can be played a part of, can be refractory brick or fire resisting stamp mass etc., according to this
Some embodiments of utility model, this utility model are preferably refractory brick.
According to embodiment of the present utility model, the burner on sidewall reducing zone is provided with the concrete species and shape of multiple burners
It is unrestricted, as long as can be used in carrying out burner mode to the burner on sidewall reducing zone heats.
According to embodiment of the present utility model, the concrete shape of the drying tube is unrestricted, can be U-shaped, W shapes or P
Shape, according to some embodiments of the present utility model, this utility model is preferably U-shaped.
According to embodiment of the present utility model, with reference to shown in Fig. 3, the dust arrester includes：Containing P2O5Smoke inlet 301,
Containing P2O5Clean gas outlet 302 and dust outlet 303, it is described containing P2O5Smoke inlet and the preheating, reduction and oxidation unit
Containing P2O5Exhanst gas outlet is connected, for containing P2O5After flue gas dust arrester process described in, obtain containing P2O5Purified gas.
According to embodiment of the present utility model, with reference to shown in Fig. 3, the hydrating apparatus include：Containing P2O5Purified gas entrance
401st, phosphoric acid outlet 402, described containing P2O5Purified gas entrance is with the dust arrester containing P2O5Clean gas outlet is connected, and is used for
P will be contained2O5Purified gas obtain phosphoric acid Jing after aquation absorption.
In other side of the present utility model, this utility model provides one kind and prepares phosphorus using foregoing system
The method of acid.Fig. 2 prepares the method flow diagram of phosphoric acid for this utility model, and with reference to shown in Fig. 2, the method can include following
Step：
（1）Feedstock treating：By phosphorus ore wet piece, reduction coal, Silicon stone and char particle, Jing after broken, screening, dispensing is mixed in proportion,
Obtain mixed material.
According to embodiment of the present utility model, wet piece of 100 weight portions of phosphorus ore, reduction coal 15-30 weight portions, Silicon stone 20-50
Weight portion, char particle 5-10 weight portion.
According to embodiment of the present utility model, the material processing device, by the breaker, screening plant that are sequentially connected
Constitute with mixing arrangement, the 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, match somebody with somebody Jing after broken, screening in proportion for just phosphorus ore, reduction coal, Silicon stone and char particle
Material is mixed, to obtain mixed material.
In raw material control allocate into suitable Silicon stone amount cause calcium monofluorophosphate. and carbon react CaO that reduction generates immediately with addition
SiO2Reaction generates calcium silicates, so as to effectively reduce the reduction temperature of calcium monofluorophosphate. so that reduction reaction is in relatively low temperature
Under can also carry out, additionally, allocating SiO into2Carbon thermal reduction temperature of the raw material fusing point higher than rock phosphate in powder in raw material can be made, so as to reduce
Energy consumption, it is ensured that production direct motion.
Using with addition of char particle, carbon content in mixture is improved, material area can be eliminated in reduction reaction earlier part oxidation of coal
Unnecessary oxygen, as carbon surplus is oxidized to reducibility gas CO, quickly realizes material area 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）Preheating, reduction and oxidation processes：By mixed material to cloth in pre- thermal reduction and oxidation unit, with described
Pre- thermal reduction and the operating of oxidation unit furnace bottom, the mixed material is dried in drying tube preheating zone successively, at preheating
Reduced and oxidation reaction in reason, then burner on sidewall reduction and zoneofoxidation described in Jing, reaction is obtained containing P after terminating2O5Flue gas.
According to embodiment of the present utility model, the drying tube preheating zone temperature of the preheating, reduction and oxidation unit is 500
DEG C -900 DEG C, the time is 20-40min；The reducing zone adopts burner on sidewall mode of heating, and reduction temperature is 1150 DEG C -1350
DEG C, the time is 20-50min.
According to embodiment of the present utility model, the preheating, reduction and oxidation unit include：Adjacent successively feed zone 1,
Drying tube preheating zone 2, burner on sidewall reducing zone 3 and discharge zone 4, the feed zone are provided with mixed material entrance 201, the discharging
Area is provided with slag outlet 203, and drying tube preheating zone furnace wall is provided with containing P2O5Exhanst gas outlet 202, the mixed material entrance
Be connected with the outlet of the mixed material of the material processing device, for mixed material is distributed into successively in rotary hearth furnace it is preheated, and also
To obtain containing P after former reaction, oxidation reaction2O5Flue gas.
There is reduction reaction in material reducing zone and produce phosphorous vapor in mixed material, make the stove top be in by controlling air-fuel ratio
Weak oxide atmosphere, and the reducing atmosphere in material area is not destroyed, it is anti-to there is oxidation in furnace roof zoneofoxidation in phosphorous vapor obtained by reducing zone
Should, realize that Phosphate ore reduction, oxidation reaction are carried out in same stove, in the radiation-curable supply reduction process of the heat that oxidation reaction is produced
Institute's calorific requirement, reducing because adjusting air-fuel ratio the furnace temperature fluctuation that brings, effectively reducing extraneous supply energy consumption, reducing production energy
Consumption.
（3）Dedusting and hydration process：To produce containing P2O5Flue gas removing dust, aquation absorb, and obtain high-concentration phosphoric acid product
Product, the slag after cooling can be used as cement producting material.
According to embodiment of the present utility model, with reference to shown in Fig. 3, the dust arrester includes：Containing P2O5Smoke inlet 301,
Containing P2O5Clean gas outlet 302 and dust outlet 303, it is described containing P2O5Smoke inlet and the preheating, reduction and oxidation unit
Containing P2O5Exhanst gas outlet is connected, for containing P2O5After flue gas dust arrester process described in, obtain containing P2O5Purified gas.
According to embodiment of the present utility model, with reference to shown in Fig. 3, the hydrating apparatus include：Containing P2O5Purified gas entrance
401st, phosphoric acid outlet 402, described containing P2O5Purified gas entrance is with the dust arrester containing P2O5Clean gas outlet is connected, and is used for
P will be contained2O5Purified gas obtain phosphoric acid Jing after aquation absorption.
Embodiment 1：
By phosphorus ore wet piece：Reduction coal：Silicon stone：Char particle according to proportioning is：100：15：20：5 are mixed, gained mixture
Material is continuously distributed in rotary hearth furnace, 500 DEG C of preheating zone temperature, 40 minutes time, 1150 DEG C of reduction temperature, 50 minutes time, preheating
The annulus angle in area is 30 °, in stove phosphorus ore occur reduction, produced by after oxidation reaction containing P2O5Flue gas Jing flue discharge after, Jing
The phosphoric acid product of acid concentration 85% is finally given after purification, aquation, the high temperature furnace slag from discharge gate discharge is through air heat-exchanging device
Can use as combustion air after preheated air, the slag after cooling can be used as cement producting material.
Embodiment 2：
By phosphorus ore wet piece：Reduction coal：Silicon stone：Char particle according to proportioning is：100：20：35：8 are mixed, gained mixture
Material is continuously distributed in rotary hearth furnace, 600 DEG C of preheating temperature, 30 minutes time, 1250 DEG C of reduction temperature, 40 minutes time, preheating zone
Annulus angle be 60 °, in stove phosphorus ore occur reduction, produced by after oxidation reaction containing P2O5, Jing after flue discharge, Jing is net for flue gas
The phosphoric acid product of acid concentration 88% is finally given 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 3：
By phosphorus ore wet piece：Reduction coal：Silicon stone：Char particle according to proportioning is：100：30：50：10 are mixed, gained mixture
Material is continuously distributed in rotary hearth furnace, 900 DEG C of preheating temperature, 20 minutes time, 1350 DEG C of reduction temperature, 20 minutes time, preheating zone
Annulus angle be 100 °, in stove phosphorus ore occur reduction, produced by after oxidation reaction containing P2O5Flue gas Jing flue discharge after, Jing
The phosphoric acid product of acid concentration 89% is finally given after purification, aquation, the high temperature furnace slag from discharge gate discharge is through air heat-exchanging device
Can use as combustion air after preheated air, the slag after cooling can be used as cement producting material.
Inventor has found, according to the system of this utility model embodiment, in mixed material it is objectionable as mechanical water,
Carbonate, water of crystallization, arsenic etc. affect phosphoric acid production cost and production efficiency, effectively can be removed in phosphorus ore not after preheated process
Good impurity, and mixed material can not drying directly enter stove reduce equipment investment；And using with addition of char particle, improve in mixture
Carbon content, can eliminate the unnecessary oxygen in material area in reduction reaction earlier part oxidation of coal, as carbon surplus is oxidized to reducibility gas
CO, quickly realizes material area reducing atmosphere, reduces carbon scaling loss in phosphorus ore compound, improves Phosphate ore reduction rate, widens raw material profit
With condition, mid low grade phosphate rock can be used；In addition drying tube preheating zone is set up in rotary hearth furnace, the drying tube is arranged at furnace wall side
Wall, using heat radiation mode preheating material, compared with conventional rotary hearth furnace is by the way of the heating of furnace wall burner on sidewall, effectively solves
Material of having determined enters the stove initial stage because causing the problem that burner is blocked powder more, reduces the pressure ball before rotary hearth furnace and raw material stoving work
Skill, shortens technological process, reduces equipment investment, with handling process it is short, equipment investment is low, equipment operation rate is high, energy consumption
It is low, the advantages of have wide range of applications.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ",
The description of " example ", " specific example " or " some examples " etc. means specific features, the knot described with reference to the embodiment or example
Structure, material or feature are contained at least one embodiment of the present utility model or example.In this manual, to above-mentioned art
The schematic representation of language is not necessarily referring to identical embodiment or example.And, the specific features of description, structure, material or
Person's feature can be combined in one or more any embodiment or example in an appropriate manner.
In description of the present utility model, it is to be understood that term " first ", " second " are only used for describing purpose, and
It is not intended that indicating or implying relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define
The feature of " first ", " second " can be expressed or implicitly include one or more this feature.Of the present utility model
In description, unless otherwise stated, " multiple " are meant that two or more.
In description of the present utility model, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", " being connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected, or integratedly
Connection；Can be mechanically connected, or put connection；Can be joined directly together, it is also possible to be indirectly connected to by intermediary,
It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
Concrete meaning of the language in this utility model.
Although embodiment of the present utility model has been shown and described above, it is to be understood that above-described embodiment is
Exemplary, it is impossible to it is interpreted as to restriction of the present utility model, one of ordinary skill in the art is in scope of the present utility model
It is interior above-described embodiment to be changed, be changed, being replaced and modification, simultaneously for one of ordinary skill in the art, foundation
The thought of the application, will change in specific embodiments and applications.
Claims (2)
1. a kind of wet lump ore is with addition of char particle type phosphoric acid preparation system, it is characterised in that include：Material processing device, preheating, reduction
And oxidation unit, dust arrester and hydrating apparatus, wherein：
The material processing device, is made up of the breaker, screening plant and mixing arrangement that are sequentially connected, is entered with phosphorus ore
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 Jing
After broken, screening, dispensing is mixed in proportion, to obtain mixed material；
The preheating, reduction and oxidation unit are improved rotary hearth furnace, including：Adjacent feed zone, drying tube preheating successively
Area, burner on sidewall reducing zone, furnace roof zoneofoxidation and discharge zone, wherein, the drying tube preheating zone is reduced with the burner on sidewall
Partition wall is provided between area, barricade between the burner on sidewall reducing zone and the discharge zone, is provided with, the partition wall and barricade by
The roof of the rotary hearth furnace is extended downwardly, and keeps certain intervals with the cloth ring-shaped furnace bottom of the rotary hearth furnace；
Wherein, the drying tube is arranged on the furnace wall side wall of the drying tube preheating zone, for the drying tube preheating zone
Heated；The burner on sidewall reducing zone is provided with multiple burners on the inside of furnace wall, for carrying out to the burner on sidewall reducing zone
Burner mode is heated；The feed zone is provided with mixed material entrance, and the discharge zone is provided with slag outlet, the drying tube preheating
Area furnace wall is provided with containing P2O5Exhanst gas outlet, the mixed material entrance export phase with the mixed material of the material processing device
Even, for being distributed into mixed material successively in rotary hearth furnace after preheated, reduction reaction, oxidation reaction to obtain containing P2O5Flue gas；
The dust arrester includes：Containing P2O5Smoke inlet, containing P2O5Clean gas outlet and dust outlet, it is described containing P2O5Flue gas enters
Mouth is with the preheating, reduction and oxidation unit containing P2O5Exhanst gas outlet is connected, for containing P2O5Dust arrester described in flue gas Jing
After process, obtain containing P2O5Purified gas；
The hydrating apparatus include：Containing P2O5Purified gas entrance, phosphoric acid outlet, it is described containing P2O5Purified gas entrance is filled with the dedusting
Put containing P2O5Clean gas outlet is connected, for containing P2O5Purified gas obtain phosphoric acid Jing after aquation absorption.
2. system according to claim 1, it is characterised in that the horizontal cross-section of the preheating, reduction and oxidation unit is
Annular, the drying tube preheating zone annulus angle is 30 ° -100 °.
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| CN106241759A (en) * | 2016-09-13 | 2016-12-21 | 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 and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106241759A (en) * | 2016-09-13 | 2016-12-21 | 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 and method |
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