CN101337663A - Method for producing industrial phosphoric acid by tunnel kiln - Google Patents
Method for producing industrial phosphoric acid by tunnel kiln Download PDFInfo
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- CN101337663A CN101337663A CNA2008103042763A CN200810304276A CN101337663A CN 101337663 A CN101337663 A CN 101337663A CN A2008103042763 A CNA2008103042763 A CN A2008103042763A CN 200810304276 A CN200810304276 A CN 200810304276A CN 101337663 A CN101337663 A CN 101337663A
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- phosphoric acid
- tunnel kiln
- kiln
- tunnel
- producing industrial
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Abstract
The invention discloses a method for producing technical grade of phosphoric acid in tunnel kilns. The method comprises the steps of pulverizing phosphorite, silica and anthracite; mixing phosphorite powder, silica powder and anthracite cuff uniformly in proportion; adding a cementing agent to prepare material lumps; coating the material lumps with a wrapping agent and baking; conducting tunnel kiln reduction: introducing the material lumps into a tunnel kiln, heating, and pushing waste materials from the kiln after the phosphor element is basically released from the material lumps; hydrating: introducing a gas from the tunnel kiln into a hydrated tower to conduct hydration absorption so as to obtain crude acid, and preparing the technical grade of phosphoric acid after the crude acid is purified. By using the method, the technical grade of phosphoric acid is produced by adopting the tunnel kiln, and the reduction reaction is conducted mainly in the tunnel kiln, thereby improving the reduction efficiency, saving fuels, reducing production cost, reducing corrosion to devices and mechanical consumption, being in accordance with the main trend of energy conservation, environmental friendliness, and recycling utilization, and having wide promotion and application space.
Description
Technical field
The present invention relates to the preparation of PHOSPHORIC ACID TECH.GRADE, particularly relate to a kind of method of producing industrial phosphoric acid by tunnel kiln.
Background technology
The industrialized preparing process of phosphoric acid mainly contains wet method, Re Fa and emerging kiln method.Wet method mainly is with the sulfuric acid decomposing phosphate rock phosphoric acid of getting made of stones, and this method needs a large amount of high-quality Rock Phosphate (72Min BPL) and sulfuric acid, also produces a large amount of phosphogypsum slags simultaneously.Hot method mainly is to use producing yellow Phosphorus by electric oven, and burning then absorbs Vanadium Pentoxide in FLAKES and produces phosphoric acid, high-grade phosphorus ore and a large amount of electric energy during this method needs.At present, the kiln legal system is got the technology of phosphoric acid and is mainly divided rotary kiln, tunnel furnace two big classes, but all still is among the research, and also inreal maturation also drops into suitability for industrialized production.
Tunnel furnace is gained the name because of the cavate tunnel of class, is widely used in industries such as pottery, refractory materials, building materials, powder metallurgy, and its major advantage is that fuel consumption is low, thermo-efficiency is high, level of automation is high, labor condition is good etc.; Main drawback is that initial cost is big, thermal regulation is difficult for often adjusting, rolled steel dosage is big, auxiliary facility is more, thus be used for more output greatly, the more single product of kind.Tunnel furnace has multiple sorting technique, can be by firing temperature height, burn till in kind, thermal source, combustion system, the kiln transportation equipment, port number and wait and classify.Tunnel furnace belongs to the Thermal Equipment of counter-current operation, and promptly the base substrate on the kiln car is oppositely made continuously with air-flow in kiln of car pusher or move in the gap, and along the kiln car working direction finish preheating successively, burn till, process of cooling.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method of producing industrial phosphoric acid by tunnel kiln, with the reduction efficiency of raising phosphorus ore, and fuel saving, the corrosion and the mechanical loss of minimizing equipment reduce production costs.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
The method of producing industrial phosphoric acid by tunnel kiln of the present invention comprises the steps:
(1) raw material is handled: get phosphorus ore, silica and pulverized anthracite and be broken to 180～220 orders, press P
2O
5: SiO
2: the ratio of C=0.5～1.5: 3.5～5.5: 0.8～1.8 (weight) mixes ground phosphate rock, ground silica and pulverized anthracite, adds behind the binding agent finish mix, and the material piece is dried after with the coating agent coating;
(2) tunnel kiln reduction: will expect that piece sends into tunnel furnace, and be heated to 1350～1380 ℃, and heat after 2～3 hours, waste material is released from kiln;
(3) aquation: will send into hydrated tower from the gas of tunnel furnace and carry out the aquation absorption, and get slightly acid, and make PHOSPHORIC ACID TECH.GRADE behind the thick acid purification.
The concrete operations of above-mentioned thick acid purification are: thick sour the filtration through pipe filter again after plate-and-frame filter press filtration, reactor decolouring promptly got PHOSPHORIC ACID TECH.GRADE.
Adopt the phosphorus ore of preceding method manufacture level phosphoric acid can be extended to middle grade or low-grade phosphate ore.
The method of aforementioned producing industrial phosphoric acid by tunnel kiln, described binding agent are kaolin, and consumption is 4～6% of a compound butt.
The method of aforementioned producing industrial phosphoric acid by tunnel kiln, described coating agent are the kaolin slurry of concentration 35～45%.
Preferably, producing industrial phosphoric acid by tunnel kiln adopts following method:
(1) raw material is handled: get phosphorus ore, silica and pulverized anthracite and be broken to 200 orders, press P
2O
5: SiO
2: C=1: the ratio of 4.71: 0.95 (weight) mixes ground phosphate rock, ground silica and pulverized anthracite, adds kaolin as binding agent, and consumption is 5% of a compound butt, finish mix, dries behind the kaolin slurry coating of material piece with concentration 40%;
(2) tunnel kiln reduction: will expect that piece sends into tunnel furnace, and be heated to 1365 ℃, and heat after 2.5 hours, waste material is released from kiln;
(3) aquation: will send into hydrated tower from the gas of tunnel furnace and carry out the aquation absorption, and get slightly acid, thick sour the filtration through pipe filter again after plate-and-frame filter press filtration, reactor decolouring promptly got PHOSPHORIC ACID TECH.GRADE.
In the method for aforementioned producing industrial phosphoric acid by tunnel kiln, the intracavity section shaped flat of described tunnel furnace and narrow, temperature rise is rapidly in the kiln, uniformity of temperature profile, fuel consumption be few, the thermo-efficiency height; Heating chamber and combustion chamber are an integral body, and this can make kiln temperature rise rapidly, thereby fuel economy has reduced the pollution that fuel produces simultaneously; Each temperature section adopts air curtain to separate, and can reduce the corrosion of equipment and the loss of machinery, and fully recycle system thermal, has also reduced fuel consumption.The inner lining material of tunnel furnace is zirconium English brick or corundum brick.
The key of technical solution of the present invention:
(1) the kiln type of tunnel furnace design
In the test of many times, by observing temperature rise situation, temperature distribution situation and the fuel consumption situation in the tunnel furnace, thermal property to different size kiln type compares, assesses, the contriver finds, the flat and narrow structure of intracavity section employing when kiln, and heating chamber, combustion chamber structurally merged when as a whole, temperature rise is rapidly in the kiln, uniformity of temperature profile, fuel consumption be minimum, the thermo-efficiency height.Based on this, the present invention has finally determined main technical details such as the profile, structure, size of tunnel furnace.
(2) inner lining material of tunnel furnace is selected
Owing in the present technique, be in the abominable working condition of high temperature, deep-etching in the tunnel furnace, can not adopt conventional inner lining material, through repetition test, determine employing zirconium English brick or corundum brick inner lining material as tunnel furnace to different inner lining materials.Zirconium English brick or corundum brick all have high strength, high rigidity, many premium propertiess such as high temperature resistant, corrosion-resistant, can guarantee the complete of tunnel furnace inwall for a long time, thereby can guarantee normal, successive production for a long time.
(3) fuel and mode thereof
In the present technique, the main heat that reacts required is supplied with by himself, and fuel only is used for producing the startup heat, so we have adopted cheap low-grade bituminous coal or coal gangue to act as a fuel, thereby make full use of existing cheapness even depleted low grade coal ore resources, and greatly reduce fuel cost; Combustion system adopts the flaming mode, and this can make kiln temperature rise rapidly, thereby fuel economy has reduced the pollution that fuel produces simultaneously.
(4) raw material block is formed and processing
By Theoretical Calculation and actual tests, determined to protect carbon sheating material (being coating agent) as raw material block with the kaolin cheap, that amount is big, and concrete parameters such as the proportioning of each composition of raw material block, material fineness, base substrate mechanism pressure.
Compared with prior art, the present invention adopts producing industrial phosphoric acid by tunnel kiln, reduction reaction is mainly carried out in tunnel furnace, the intracavity section shaped flat of tunnel furnace and narrow, helping warm air like this is evenly distributed, improve reduction efficiency, the heating chamber of tunnel furnace and combustion chamber are structurally as a whole, help fuel saving, reduce production costs, each temperature section of tunnel furnace adopts air curtain to separate, can reduce the corrosion of equipment and the loss of machinery, the clinker that is produced can be used for producing floor tile, as the bituminous pavement spike, realized the cyclic utilization of waste, meet current energy-conservation, environmental protection, the megatrend of recycle has wide popularization and application space.
Embodiment
The preferred embodiment of the present invention:
(1) raw material is handled: get phosphorus ore, silica and pulverized anthracite and be broken to 200 orders, press P
2O
5: SiO
2: C=1: the ratio of 4.71: 0.95 (weight) mixes ground phosphate rock, ground silica and pulverized anthracite, adds kaolin as binding agent, and consumption is 5% of a compound butt, finish mix, dries behind the kaolin slurry coating of material piece with concentration 40%;
(2) tunnel kiln reduction: will expect that piece sends into tunnel furnace, and be heated to 1365 ℃, and reduction reaction take place obtain P
4Steam and CO, P subsequently
4Steam is oxidized to P
2O
5, CO is oxidized to CO
2, in tunnel furnace, oxidizing reaction institute liberated heat is supplied with reduction reaction, improves heat utilization ratio, and after the phosphoric in the material piece was released out substantially, gas was sent into hydrated tower and is carried out the aquation absorption, heats and after 2.5 hours waste material is released from kiln;
(3) aquation: will send into hydrated tower from the gas of tunnel furnace and carry out the aquation absorption, absorption liquid is sent into dilute acid bath, carry out circular treatment by sour pump again, obtain thick acid, thick acid is at first filtered through plate-and-frame filter press, and the dust of being brought in the acid by kiln gas is filtered, discharge with the filter residue form, then, after reactor adds bleaching agent bleaching, filter through pipe filter again and promptly get PHOSPHORIC ACID TECH.GRADE;
(4) three wastes are handled: directly deliver to the slag field after the clinker cooling of tunnel furnace release, be used to produce floor tile or as the bituminous pavement spike, the waste gas that comes autoreduction workshop section by washer, lye vat after, by the induced draft fan emptying, water in present method is recycle, not externally discharging.
Claims (8)
1. the method for a producing industrial phosphoric acid by tunnel kiln, it is characterized in that: this method comprises the steps:
(1) raw material is handled: get phosphorus ore, silica and pulverized anthracite and be broken to 180～220 orders, ratio in P2O5: SiO2: C=0.5～1.5: 3.5～5.5: 0.8～1.8 (weight) mixes ground phosphate rock, ground silica and pulverized anthracite, add behind the binding agent finish mix, the material piece is dried after with the coating agent coating;
(2) tunnel kiln reduction: will expect that piece sends into tunnel furnace, and be heated to 1350～1380 ℃, and heat after 2～3 hours, waste material is released from kiln;
(3) aquation: will send into hydrated tower from the gas of tunnel furnace and carry out the aquation absorption, and get slightly acid, and make PHOSPHORIC ACID TECH.GRADE behind the thick acid purification.
2. according to the method for the described producing industrial phosphoric acid by tunnel kiln of claim 1, it is characterized in that: described thick acid purification is: thick sour the filtration through pipe filter again after plate-and-frame filter press filtration, reactor decolouring promptly got PHOSPHORIC ACID TECH.GRADE.
3. according to the method for the described producing industrial phosphoric acid by tunnel kiln of claim 1, it is characterized in that: described phosphorus ore is middle grade or low-grade phosphate ore.
4. according to the method for the described producing industrial phosphoric acid by tunnel kiln of claim 1, it is characterized in that: described binding agent is a kaolin, and consumption is 4～6% of a compound butt.
5. according to the method for the described producing industrial phosphoric acid by tunnel kiln of claim 1, it is characterized in that: described coating agent is the kaolin slurry of concentration 35～45%.
6. according to the method for the arbitrary described producing industrial phosphoric acid by tunnel kiln of claim 1-5, it is characterized in that: this method comprises the steps:
(1) raw material is handled: get phosphorus ore, silica and pulverized anthracite and be broken to 200 orders, in P2O5: SiO2: C=1: the ratio of 4.71: 0.95 (weight) mixes ground phosphate rock, ground silica and pulverized anthracite, add kaolin as binding agent, consumption is 5% of a compound butt, finish mix, dry behind the kaolin slurry coating of material piece with concentration 40%;
(2) tunnel kiln reduction: will expect that piece sends into tunnel furnace, and be heated to 1365 ℃, and heat after 2.5 hours, waste material is released from kiln;
(3) aquation: will send into hydrated tower from the gas of tunnel furnace and carry out the aquation absorption, and get slightly acid, thick sour the filtration through pipe filter again after plate-and-frame filter press filtration, reactor decolouring promptly got PHOSPHORIC ACID TECH.GRADE.
7. according to the method for the described producing industrial phosphoric acid by tunnel kiln of claim 6, it is characterized in that: the intracavity section shaped flat of described tunnel furnace and narrow, heating chamber and combustion chamber are an integral body, and each temperature section adopts air curtain to separate.
8. according to the method for the described producing industrial phosphoric acid by tunnel kiln of claim 7, it is characterized in that: the inner lining material of described tunnel furnace is zirconium English brick or corundum brick.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008103042763A CN101337663A (en) | 2008-08-28 | 2008-08-28 | Method for producing industrial phosphoric acid by tunnel kiln |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008103042763A CN101337663A (en) | 2008-08-28 | 2008-08-28 | Method for producing industrial phosphoric acid by tunnel kiln |
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|---|---|
| CN101337663A true CN101337663A (en) | 2009-01-07 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597039B (en) * | 2009-07-08 | 2011-06-08 | 湖北兴发化工集团股份有限公司 | Method for producing phosphoric acid by utilizing tunnel kiln |
| CN102381690A (en) * | 2010-12-03 | 2012-03-21 | 宣威市恒邦磷化工业有限公司 | Powdered rock phosphate oxygen-enriched binder |
| CN102765706A (en) * | 2012-08-20 | 2012-11-07 | 黄靖元 | Method for producing phosphoric acid through ground phosphate rock in fast hot-melting mode |
| WO2014194569A1 (en) * | 2013-06-04 | 2014-12-11 | 四川玖长科技有限公司 | Device for preparing phosphoric acid from smoke exiting kiln in kiln process for production of phosphoric acid |
-
2008
- 2008-08-28 CN CNA2008103042763A patent/CN101337663A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597039B (en) * | 2009-07-08 | 2011-06-08 | 湖北兴发化工集团股份有限公司 | Method for producing phosphoric acid by utilizing tunnel kiln |
| CN102381690A (en) * | 2010-12-03 | 2012-03-21 | 宣威市恒邦磷化工业有限公司 | Powdered rock phosphate oxygen-enriched binder |
| CN102765706A (en) * | 2012-08-20 | 2012-11-07 | 黄靖元 | Method for producing phosphoric acid through ground phosphate rock in fast hot-melting mode |
| WO2014194569A1 (en) * | 2013-06-04 | 2014-12-11 | 四川玖长科技有限公司 | Device for preparing phosphoric acid from smoke exiting kiln in kiln process for production of phosphoric acid |
| RU2643049C2 (en) * | 2013-06-04 | 2018-01-30 | Сычуань Ко Чанг Технолоджи Ко., Лтд | Device for obtaining and production of phosphoric acid from smoke received in process of combustion in furnace |
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Open date: 20090107 |