CN106185851A - A kind of dry bulb pyrolysis-type phosphoric acid preparation system and method - Google Patents
A kind of dry bulb pyrolysis-type phosphoric acid preparation system and method Download PDFInfo
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- CN106185851A CN106185851A CN201610819009.4A CN201610819009A CN106185851A CN 106185851 A CN106185851 A CN 106185851A CN 201610819009 A CN201610819009 A CN 201610819009A CN 106185851 A CN106185851 A CN 106185851A
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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
- C01B25/185—Preparation neither from elemental phosphorus or phosphoric anhydride nor by reacting phosphate-containing material with an acid, e.g. by reacting phosphate-containing material with an ion-exchange resin or an acid salt used alone
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/28—Cements from oil shales, residues or waste other than slag from combustion residues, e.g. ashes or slags from waste incineration
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention belongs to technical field of phosphorous chemical industry, be specifically related to a kind of dry bulb pyrolysis-type phosphoric acid preparation system and method.This system includes: material processing device, roasting and reduction apparatus, oxidation and hydrating apparatus, wherein: described material processing device, including the breaker being sequentially connected with, screening plant, mixing arrangement, shaped device and drying device；Described roasting and reduction apparatus include: the most adjacent feed zone, radial canal preheating zone, burner on sidewall reducing zone and discharge zone；Described oxidation and hydrating apparatus, have phosphorous vapor entrance and phosphoric acid outlet, and described phosphorous vapor entrance exports with described roasting and reduction apparatus phosphorous vapor and is connected.This system has that adaptability to raw material is wide, it is low to consume energy, production capacity is high and added value of product advantages of higher.
Description
Technical field
The invention belongs to technical field of phosphorous chemical industry, be specifically related to a kind of dry bulb pyrolysis-type phosphoric acid preparation system and method.
Background technology
The industrialized preparing process of phosphoric acid mainly has following several at present: phosphoric acid by wet process: produce with sulfuric acid decomposition rock phosphate in powder
Phosphoric 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；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；New kiln method phosphorus
Acid technique: the tackling key problem of this Technology it is crucial that should be by regions different with oxidation reaction the two atmosphere requirements for the reduction of phosphorus
Effective isolation does not the most hinder heat transfer each other and mass transfer.And current most of pyrogenic process phosphate raw materials use mine to open
The natural lump ore adopted is main, simply just puts into production after simple processed, but objectionable such as carbon in rock phosphate in powder
Hydrochlorate, water of crystallization, arsenic etc. affect phosphoric acid production cost and production efficiency；Produced fine ore amount in phosphorus ore recovery process simultaneously
Account for the 50% of yield, due to the relatively low (P of fine ore grade2O5Content is low), the fineness fine powder less than 3mm all can not enter stove and produce,
A large amount of wastes of rock phosphate in powder fine ore are thus resulted in.Along with day by day exhausted, the dilution of phosphate rock resource, still use natural lump ore
Producing not only cost more and more higher, the power consumption in technical process is increasing.Therefore, how to develop one and can widen raw material
Condition, reduction power consumption, the method and system preparing phosphoric acid of raising added value of product is utilized to become this area and need the skill of solution badly
Art problem.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, it is proposed that a kind of dry bulb pyrolysis-type phosphoric acid preparation system and method.This is
System has that adaptability to raw material is wide, it is low to consume energy, production capacity is high and added value of product advantages of higher.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
The present invention proposes a kind of dry bulb pyrolysis-type phosphoric acid preparation system.According to embodiments of the invention, this system includes: raw material
Processing means, roasting and reduction apparatus, oxidation and hydrating apparatus are wherein: described material processing device, broken including be sequentially connected with
Crushing device, screening plant, mixing arrangement, shaped device and drying device, described material processing device has ground phosphate rock entrance, goes back
Raw coal entrance, Silicon stone entrance and bonding agent entrance and drying and moulding material outlet；Described roasting and reduction apparatus are improved
Rotary hearth furnace, including: the most adjacent feed zone, radial canal preheating zone, burner on sidewall reducing zone and discharge zone；Wherein, enter described in
Material district is provided with the material inlet being connected with described material processing device drying and moulding material outlet, and described radial canal preheating zone is provided with
Phosphorous vapor outlet and pyrolysis gas outlet, described discharge zone is provided with slag outlet, described radial canal preheating zone and described burner on sidewall
It is provided with partition wall between reducing zone, between described burner on sidewall reducing zone and described discharge zone, is provided with barricade, described partition wall and barricade
Roof by described rotary hearth furnace downwardly extends, and keeps certain intervals, described spoke with the cloth ring-shaped furnace bottom of described rotary hearth furnace
Penetrate and be provided with multiple radial canal inside furnace wall, pipe preheating zone, for described radial canal preheating zone is heated, described burner on sidewall
Reducing zone is provided with multiple burner, for described burner on sidewall reducing zone is carried out burner mode heating；Described oxidation and aquation dress
Putting, have phosphorous vapor entrance and phosphoric acid outlet, described phosphorous vapor entrance exports with described roasting and reduction apparatus phosphorous vapor and is connected.
Inventor finds, this system according to embodiments of the present invention, uses regenerative rotary hearth furnace equipment, coordinates high temperature air
Combustion technology, can use low calorie fuels as the thermal source of heating, and combustion thermal efficiency is high, can control preferable reducing gases in stove
Atmosphere, improves ground phosphate rock percent reduction, and by setting up preheating zone in rotary hearth furnace, raw material is effectively removed through mixing, molding, heating process
Objectionable such as carbonate, water of crystallization, arsenic etc. in ground phosphate rock, and use heat accumulation type radiant tube mode of heating to avoid naked light to burn
Heating causes feed coal loss and the impact for pyrolysis of coal atmosphere, additionally, use low grade rock phosphate briquet replacing coke to adopt
With low fixed carbon, high volatile colm as raw material, coal generation pyrolytic reaction in heating process, can obtain high fixing
Carbon and the carbon raw material of low volatile, thus requirement to raw material during meeting sequential reduction, it addition, arrange in preheating zone
Gas recovery system for oil, coal gas and the coal tar, relatively traditional handicraft that can produce with efficient recovery pyrolytic process are compared, and can substantially drop
Low phosphoric acid raw materials for production cost, and widen raw material sources, enrich product category simultaneously, improve added value of product.
According to embodiments of the invention, described roasting and reduction apparatus are improved regenerative rotary hearth furnace.
Pyrolysis gas processing means, described pyrolysis gas is set up according to embodiments of the invention, roasting and reduction apparatus preheating zone
Processing means includes pyrolysis gas clean unit, Oil-gas Separation unit and the cooling unit being sequentially connected with, have pyrolysis gas entrance and
Coal gas, tar outlet, the pyrolysis gas outlet of described preheating zone is connected with the pyrolysis gas entrance of described pyrolysis gas processing means.
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 and ball processed: by ground phosphate rock, reduction coal and
Dispensing in proportion after Silicon stone drying, broken, screening, allocates after binding agent mixing compressing into, obtains molding materials；(2)
Roasting and reduction treatment: carry out roasting and reduction treatment in described molding materials is distributed into described roasting and reduction apparatus, obtain
Coal gas that phosphorous vapor and pyrolysis of coal produce and coal tar；(3) oxidation and hydration process: by oxidized for high temperature phosphorous steam and washing
After reason, obtaining high concentration phosphorus acid product, smelted furnace cinder can be used as cement raw material.
According to embodiments of the invention, raw material weight proportioning is: ground phosphate rock 100 weight portion, reduction coal 20-40 weight portion,
Silicon stone 20-50 weight portion；Described binding agent is one or more in bentonite, Bentonite, clay.
According to embodiments of the invention, described molding materials is distributed in described roasting and reduction apparatus, utilizes radial canal pre-
Hot-zone carries out heating calcination process, and the temperature of described preheating zone calcination process is 500 DEG C-900 DEG C, and the time is 20-40min；Institute
Stating reducing zone reduction temperature and be 1150-1350 DEG C, the time is 20-50min.
The present invention at least has the advantages that
1) present invention is by setting up preheating zone in rotary hearth furnace, and raw material can effectively remove ground phosphate rock through mixing, molding, heating process
In objectionable such as carbonate, water of crystallization, arsenic etc., and use heat accumulation type radiant tube mode of heating that naked light burning can be avoided to add
Heat causes feed coal loss and the impact for pyrolysis of coal atmosphere.
2) present invention uses low grade rock phosphate briquet replacing coke can use the colm conduct of low fixed carbon, high volatile
Raw material, coal generation pyrolytic reaction in heating process, the carbon raw material of high fixed carbon and low volatile can be obtained, thus meet
Requirement to raw material during sequential reduction, it addition, arrange gas recovery system for oil in preheating zone, can be pyrolyzed with efficient recovery
Coal gas and coal tar, relatively traditional handicraft that journey produces are compared, and can substantially reduce phosphoric acid production cost of material, and widen raw material
Source, enriches product category simultaneously, improves added value of product.
3) present invention uses regenerative rotary hearth furnace equipment, coordinates HTAC, low calorie fuels can be used to make
For the thermal source of heating, combustion thermal efficiency is high, can control preferable reducing atmosphere in stove, improves ground phosphate rock percent reduction.
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, radial canal preheating zone 2, burner on sidewall reducing zone 3, discharge zone 4, flue 5, preheating zone and reduction
Interval partition wall 6, discharge end barricade 7, radial canal 8, burner 9, material processing device S100, ground phosphate rock entrance 101, reduction coal entrance
102, Silicon stone entrance 103, binding agent entrance 104, drying and moulding material outlet 105, roasting and reduction apparatus S200, material inlet
201, phosphorous vapor outlet 202, coal gas, tar outlet 203, slag outlet 204, oxidation and hydrating apparatus S300, phosphorous vapor entrance
301, phosphoric acid outlet 302.
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 dry bulb pyrolysis-type phosphoric acid preparation system.According to embodiments of the invention, Fig. 1 is the present invention
The schematic diagram of transformation rotary hearth furnace, Fig. 3 is the system simple diagram that the present invention prepares phosphoric acid, shown in reference Fig. 1 and Fig. 3, this system bag
Include: material processing device S100, roasting and reduction apparatus S200, oxidation and hydrating apparatus S300, wherein: described Feedstock treating fills
Put and there is ground phosphate rock entrance 101, reduction coal entrance 102, Silicon stone entrance 103 and bonding agent entrance 104 and drying and moulding material goes out
Mouthfuls 105, and for by phosphorus ore, reduction coal, Silicon stone dispensing add binding agent mixing in proportion after broken, screening, molding is dry
Drying and moulding material is obtained after dry；Described roasting and reduction apparatus include: the most adjacent feed zone 1, radial canal preheating zone 2,
Burner on sidewall reducing zone 3 and discharge zone 4；Wherein, be provided with between described radial canal preheating zone and described burner on sidewall reducing zone every
Wall 6, is provided with barricade 7, described partition wall and barricade by described rotary hearth furnace between described burner on sidewall reducing zone and described discharge zone
Roof downwardly extend, and keep certain intervals, furnace wall, described radial canal preheating zone with the cloth ring-shaped furnace bottom of described rotary hearth furnace
Inner side is provided with multiple radial canal 8, and for heating described radial canal preheating zone, described burner on sidewall reducing zone is provided with multiple
Burner 9, for carrying out burner mode heating to described burner on sidewall reducing zone.
Inventor finds, this system according to embodiments of the present invention, uses regenerative rotary hearth furnace equipment, coordinates high temperature air
Combustion technology, can use low calorie fuels as the thermal source of heating, and combustion thermal efficiency is high, can control preferable reducing gases in stove
Atmosphere, improves ground phosphate rock percent reduction, and by setting up preheating zone in rotary hearth furnace, raw material is effectively removed through mixing, molding, heating process
Objectionable such as carbonate, water of crystallization, arsenic etc. in ground phosphate rock, and use heat accumulation type radiant tube mode of heating to avoid naked light to burn
Heating causes feed coal loss and the impact for pyrolysis of coal atmosphere, additionally, use low grade rock phosphate briquet replacing coke to adopt
With low fixed carbon, high volatile colm as raw material, coal generation pyrolytic reaction in heating process, can obtain high fixing
Carbon and the carbon raw material of low volatile, thus requirement to raw material during meeting sequential reduction, it addition, arrange in preheating zone
Gas recovery system for oil, coal gas and the coal tar, relatively traditional handicraft that can produce with efficient recovery pyrolytic process are compared, and can substantially drop
Low phosphoric acid raw materials for production cost, and widen raw material sources, enrich product category simultaneously, improve added value of product.
According to embodiments of the invention, described material processing device, including the breaker being sequentially connected with, screening plant,
Mixing arrangement, shaped device and drying device.
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 powdery, can be that metal breaker, stone breaker, hogging device or plastics are broken
Crushing device, 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, the concrete kind of described shaped device is unrestricted, as long as can play material
Making required shape, the present invention is preferably pelletizing shaped device.
According to embodiments of the invention, the concrete kind of described drying device is unrestricted, as long as can play dry
Act on, can be normal pressure or vacuum drying apparatus, batch (-type) or continuous drier, according to some embodiments of the present invention,
The present invention is preferably atmospheric dryer or continuous drier.
According to embodiments of the invention, described roasting and reduction apparatus are improved for regenerative rotary hearth furnace, Qi Zhongsuo
The model stating rotary hearth furnace is unrestricted.
According to embodiments of the invention, with reference to shown in Fig. 3, described feed zone is provided with and is dried to described material processing device
The material inlet 201 that type material outlet is connected, described radial canal preheating zone is provided with phosphorous vapor outlet 202 and pyrolysis gas outlet, institute
State discharge zone and be provided with slag outlet 204, described molding materials is dried cloth in backward regenerative rotary hearth furnace, turns the end along with described
The operating of stove furnace bottom, described molding materials carries out calcination process successively in radial canal preheating zone, then carries out in reducing zone also
Former reaction, reaction obtains phosphorous vapor, coal gas and coal tar after terminating.
According to embodiments of the invention, described oxidation and hydrating apparatus, there is phosphorous vapor entrance 301 and phosphoric acid outlet 302,
Described phosphorous vapor entrance exports with described roasting and reduction apparatus phosphorous vapor and is connected, and produced by furnace reduction, phosphorous vapor is through flue
5 discharge, and oxidized and hydrating apparatus finally gives high concentration phosphorus acid product after processing, and high temperature furnace slag is pre-through air heat-exchanging device
Delivering to drying system after hot-air use or use as combustion air, the slag after cooling can be used as cement producting material.
Pyrolysis gas processing means, described pyrolysis gas is set up according to embodiments of the invention, roasting and reduction apparatus preheating zone
Processing means includes pyrolysis gas clean unit, Oil-gas Separation unit and the cooling unit being sequentially connected with, have pyrolysis gas entrance and
Coal gas, tar outlet 203, the pyrolysis gas outlet of described preheating zone is connected with the pyrolysis gas entrance of described pyrolysis gas processing means.
According to embodiments of the invention, the partition wall being provided with between described radial canal 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, p-shaped or W shape, root
According to some embodiments of the present invention, the present invention is preferably U-shaped.
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 and ball processed: by dispensing in proportion after ground phosphate rock, reduction coal and Silicon stone drying, broken, screening, allocate into
Mix and compressing after binding agent, obtain molding materials.
According to embodiments of the invention, this system includes: material processing device S100, roasting and reduction apparatus S200, oxygen
Change and hydrating apparatus S300, wherein: described material processing device has ground phosphate rock entrance 101, reduction coal entrance 102, Silicon stone enter
Mouthfuls 103 and bonding agent entrance 104 and drying and moulding material outlet 105.
According to embodiments of the invention, with reference to shown in Fig. 3, described feed zone is provided with and is dried to described material processing device
The material inlet 201 that type material outlet is connected, described radial canal preheating zone is provided with phosphorous vapor outlet 202 and pyrolysis gas outlet, institute
State discharge zone and be provided with slag outlet 204.
(2) roasting and reduction treatment: carry out roasting in described molding materials is distributed into described roasting and reduction apparatus and go back
Original place is managed, and utilizes radial canal preheating zone to carry out heating calcination process, and the temperature of described preheating zone calcination process is 500 DEG C-900
DEG C, the time is 20-40min, and described reducing zone reduction temperature is 1150-1350 DEG C, and the time is 20-50min, obtain phosphorous vapor and
The coal gas of pyrolysis of coal generation and coal tar.
Pyrolysis gas processing means, described pyrolysis gas is set up according to embodiments of the invention, roasting and reduction apparatus preheating zone
Processing means includes pyrolysis gas clean unit, Oil-gas Separation unit and the cooling unit being sequentially connected with, have pyrolysis gas entrance and
Coal gas, tar outlet 203, the pyrolysis gas outlet of described preheating zone is connected with the pyrolysis gas entrance of described pyrolysis gas processing means.
(3) oxidation and hydration process: after oxidized for high temperature phosphorous steam and washing being processed, obtain high concentration phosphorus acid product,
Smelted furnace cinder can be used as cement raw material.
According to embodiments of the invention, described oxidation and hydrating apparatus, there is phosphorous vapor entrance 301 and phosphoric acid outlet 302,
Described phosphorous vapor entrance exports with described roasting and reduction apparatus phosphorous vapor and is connected, and produced by furnace reduction, phosphorous vapor is through flue
5 discharge, and oxidized and hydrating apparatus finally gives high concentration phosphorus acid product after processing, and high temperature furnace slag is pre-through air heat-exchanging device
Delivering to drying system after hot-air use or use as combustion air, the slag after cooling can be used as cement producting material.
According to embodiments of the invention, raw material weight proportioning is: ground phosphate rock 100 weight portion, reduction coal 20-40 weight portion,
Silicon stone 20-50 weight portion；The concrete kind of described binding agent is unrestricted, and according to some embodiments of the present invention, the present invention is excellent
Elect one or more in bentonite, Bentonite, clay as.
Embodiment 1:
By raw material according to ground phosphate rock 100 weight portion, reduction coal 20 weight portion, the part by weight dispensing of Silicon stone 20 weight portion, allocate 3 into
Mixing and suppress balling-up after the bentonite of weight portion, made pelletizing is distributed in regenerative rotary hearth furnace after drying, preheating zone roasting temperature
Spending 500 DEG C, roasting time 40 minutes, reduction temperature 1150 DEG C, 50 minutes time, rotary hearth furnace preheating zone arranges petroleum vapor recovery system
System, can be with coal gas and coal tar produced by pyrolysis of coal in efficient recovery heating process, phosphorous vapor warp produced by furnace reduction
After flue is discharged, after oxidized and aquation, finally give the phosphoric acid product of acid concentration 87%, the high temperature furnace slag warp discharged from discharge gate
Delivering to drying system after crossing air heat-exchanging device preheated air use or use as combustion air, the slag after cooling can be used as
Cement producting material.
Embodiment 2:
By raw material according to ground phosphate rock 100 weight portion, reduction coal 30 weight portion, the part by weight dispensing of Silicon stone 35 weight portion, allocate 5 into
Mixing and suppress balling-up after the Bentonite of weight portion, made pelletizing is distributed in regenerative rotary hearth furnace after drying, preheating zone sintering temperature
600 DEG C, roasting time 30 minutes, reduction temperature 1250 DEG C, 40 minutes time, rotary hearth furnace preheating zone arranges gas recovery system for oil,
Can be with coal gas and coal tar produced by pyrolysis of coal in efficient recovery heating process, produced by furnace reduction, phosphorous vapor is through flue
After discharge, finally giving the phosphoric acid product of acid concentration 89% after oxidized and aquation, the high temperature furnace slag discharged from discharge gate is through sky
Delivering to drying system after gas heat-exchanger rig preheated air use or use as combustion air, the slag after cooling can be used as cement
Raw materials for production.
Embodiment 3:
By raw material according to ground phosphate rock 100 weight portion, reduction coal 40 weight portion, the part by weight dispensing of Silicon stone 50 weight portion, allocate 6 into
Mixing and suppress balling-up after the clay of weight portion, made pelletizing is distributed in regenerative rotary hearth furnace after drying, preheating zone sintering temperature
900 DEG C, roasting time 20 minutes, reduction temperature 1350 DEG C, 20 minutes time, rotary hearth furnace preheating zone arranges gas recovery system for oil,
Can be with coal gas and coal tar produced by pyrolysis of coal in efficient recovery heating process, produced by furnace reduction, phosphorous vapor is through flue
After discharge, finally giving the phosphoric acid product of acid concentration 88% after oxidized-aquation, the high temperature furnace slag discharged from discharge gate passes through sky
Delivering to drying system after gas heat-exchanger rig preheated air use or use as combustion air, the slag after cooling can be used as cement
Raw materials for production.
Inventor finds, this system according to embodiments of the present invention, uses regenerative rotary hearth furnace equipment, coordinates high temperature air
Combustion technology, can use low calorie fuels as the thermal source of heating, and combustion thermal efficiency is high, can control preferable reducing gases in stove
Atmosphere, improves ground phosphate rock percent reduction, and by setting up preheating zone in rotary hearth furnace, raw material is effectively removed through mixing, molding, heating process
Objectionable such as carbonate, water of crystallization, arsenic etc. in ground phosphate rock, and use heat accumulation type radiant tube mode of heating to avoid naked light to burn
Heating causes feed coal loss and the impact for pyrolysis of coal atmosphere, additionally, use low grade rock phosphate briquet replacing coke to adopt
With low fixed carbon, high volatile colm as raw material, coal generation pyrolytic reaction in heating process, can obtain high fixing
Carbon and the carbon raw material of low volatile, thus requirement to raw material during meeting sequential reduction, it addition, arrange in preheating zone
Gas recovery system for oil, coal gas and the coal tar, relatively traditional handicraft that can produce with efficient recovery pyrolytic process are compared, and can substantially drop
Low phosphoric acid raw materials for production cost, and widen raw material sources, enrich product category simultaneously, improve added value of product.
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 (6)
1. a dry bulb pyrolysis-type phosphoric acid preparation system, it is characterised in that including: material processing device, roasting and reduction apparatus,
Oxidation and hydrating apparatus, wherein:
Described material processing device, including the breaker being sequentially connected with, screening plant, mixing arrangement, shaped device and be dried
Device, described material processing device has ground phosphate rock entrance, reduction coal entrance, Silicon stone entrance and bonding agent entrance and drying and moulding
Material outlet；
Described roasting and reduction apparatus are improved rotary hearth furnace, including: the most adjacent feed zone, radial canal preheating zone, side
Wall burner reducing zone and discharge zone；Wherein, described feed zone is provided with and described material processing device drying and moulding material outlet phase
Material inlet even, described radial canal preheating zone is provided with phosphorous vapor outlet and pyrolysis gas outlet, and described discharge zone is provided with slag and goes out
Mouthful, it being provided with partition wall between described radial canal preheating zone and described burner on sidewall reducing zone, described burner on sidewall reducing zone is with described
Be provided with barricade, described partition wall and barricade between discharge zone to be downwardly extended by the roof of described rotary hearth furnace, and with described rotary hearth furnace
Cloth ring-shaped furnace bottom keep certain intervals, described radial canal preheating zone is provided with multiple radial canal inside furnace wall, for described
Radial canal preheating zone is heated, and described burner on sidewall reducing zone is provided with multiple burner, for described burner on sidewall reducing zone
Carry out burner mode heating；
Described oxidation and hydrating apparatus, have phosphorous vapor entrance and a phosphoric acid outlet, described phosphorous vapor entrance and described roasting and and also
The outlet of original device phosphorous vapor is connected.
System the most according to claim 1, it is characterised in that described roasting and reduction apparatus are that improved heat accumulating type turns
End stove.
System the most according to claim 1, it is characterised in that roasting and reduction apparatus preheating zone are set up pyrolysis gas and processed dress
Putting, described pyrolysis gas processing means includes pyrolysis gas clean unit, Oil-gas Separation unit and the cooling unit being sequentially connected with, and has
The pyrolysis gas of pyrolysis gas entrance and coal gas, tar outlet, the pyrolysis gas outlet of described preheating zone and described pyrolysis gas processing means
Entrance is connected.
4. one kind utilizes the method that the system according to any one of claim 1-3 prepares phosphoric acid, it is characterised in that include following
Step:
(1) Feedstock treating and ball processed: by dispensing in proportion after ground phosphate rock, reduction coal and Silicon stone drying, broken, screening, allocate into
Mix and compressing after binding agent, obtain molding materials；
(2) roasting and reduction treatment: carry out roasting in described molding materials is distributed into described roasting and reduction apparatus and go back original place
Reason, obtains phosphorous vapor and the coal gas of pyrolysis of coal generation and coal tar；
(3) oxidation and hydration process: after oxidized for high temperature phosphorous steam and washing being processed, obtain high concentration phosphorus acid product, smelt
Slag can be used as cement raw material.
Method the most according to claim 4, it is characterised in that raw material weight proportioning is: ground phosphate rock 100 weight portion, reduction
Coal 20-40 weight portion, Silicon stone 20-50 weight portion；Described binding agent is one or more in bentonite, Bentonite, clay.
Method the most according to claim 4, it is characterised in that described molding materials is distributed into described roasting and reduction apparatus
In, utilize radial canal preheating zone to carry out heating calcination process, the temperature of described preheating zone calcination process is 500 DEG C-900 DEG C, time
Between be 20-40min；Described reducing zone reduction temperature is 1150-1350 DEG C, and the time is 20-50min.
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| CN201610819009.4A CN106185851A (en) | 2016-09-13 | 2016-09-13 | A kind of dry bulb pyrolysis-type phosphoric acid preparation system and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106495116A (en) * | 2016-12-21 | 2017-03-15 | 江苏省冶金设计院有限公司 | Rotary hearth furnace |
| CN106517121A (en) * | 2016-12-21 | 2017-03-22 | 江苏省冶金设计院有限公司 | System for processing phosphorite and application thereof |
| CN106586986A (en) * | 2016-12-23 | 2017-04-26 | 江苏省冶金设计院有限公司 | System for processing phosphorite and application thereof |
| CN112683052A (en) * | 2020-12-22 | 2021-04-20 | 寿县安固建材有限公司 | Coal gangue brick sintering processing equipment and processing method thereof |
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| 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 |
| CN206069376U (en) * | 2016-09-13 | 2017-04-05 | 江苏省冶金设计院有限公司 | A kind of dry bulb pyrolysis-type phosphoric acid preparation system |
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| 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 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106495116A (en) * | 2016-12-21 | 2017-03-15 | 江苏省冶金设计院有限公司 | Rotary hearth furnace |
| CN106517121A (en) * | 2016-12-21 | 2017-03-22 | 江苏省冶金设计院有限公司 | System for processing phosphorite and application thereof |
| CN106586986A (en) * | 2016-12-23 | 2017-04-26 | 江苏省冶金设计院有限公司 | System for processing phosphorite and application thereof |
| CN112683052A (en) * | 2020-12-22 | 2021-04-20 | 寿县安固建材有限公司 | Coal gangue brick sintering processing equipment and processing method thereof |
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