CN109912245B - Method and device for co-production of gypsum powder in sulfuric acid production - Google Patents
Method and device for co-production of gypsum powder in sulfuric acid production Download PDFInfo
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- CN109912245B CN109912245B CN201910343446.7A CN201910343446A CN109912245B CN 109912245 B CN109912245 B CN 109912245B CN 201910343446 A CN201910343446 A CN 201910343446A CN 109912245 B CN109912245 B CN 109912245B
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- phosphogypsum
- fluidized bed
- sulfuric acid
- gypsum powder
- heat exchanger
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- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 title claims abstract description 115
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 71
- 239000010440 gypsum Substances 0.000 title claims abstract description 44
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 44
- 239000000843 powder Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 10
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims abstract description 95
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000001354 calcination Methods 0.000 claims abstract description 17
- 239000002002 slurry Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 12
- 238000007664 blowing Methods 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000012986 modification Methods 0.000 claims abstract description 6
- 230000004048 modification Effects 0.000 claims abstract description 6
- 238000002360 preparation method Methods 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 239000011343 solid material Substances 0.000 claims description 58
- 238000005192 partition Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000002440 industrial waste Substances 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 5
- 239000004571 lime Substances 0.000 claims description 5
- 239000008267 milk Substances 0.000 claims description 5
- 210000004080 milk Anatomy 0.000 claims description 5
- 235000013336 milk Nutrition 0.000 claims description 5
- 239000011593 sulfur Substances 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- 238000003828 vacuum filtration Methods 0.000 claims description 4
- 238000011085 pressure filtration Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 25
- 239000002918 waste heat Substances 0.000 abstract description 11
- 239000002699 waste material Substances 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical group [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 239000004566 building material Substances 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000004035 construction material Substances 0.000 description 2
- 230000029087 digestion Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 239000011426 gypsum mortar Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000011505 plaster Substances 0.000 description 2
- 239000002352 surface water Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- QCJQWJKKTGJDCM-UHFFFAOYSA-N [P].[S] Chemical compound [P].[S] QCJQWJKKTGJDCM-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 1
- 229910052683 pyrite Inorganic materials 0.000 description 1
- 239000011028 pyrite Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Abstract
The invention discloses a method and a device for producing co-production gypsum powder by sulfuric acid, which take phosphogypsum as a raw material and take high-temperature sulfur dioxide gas generated by sulfuric acid production as a heat source, and comprise the following preparation steps: (1) Mixing phosphogypsum, adding an alkaline material for modification, and filtering the modified phosphogypsum slurry for later use; (2) And (3) adding the modified phosphogypsum obtained in the previous step into a fluidized bed, introducing high-temperature sulfur dioxide gas generated by sulfuric acid production into the tubes of the tubular heat exchanger, blowing air inwards from the bottom of the fluidized bed, allowing the phosphogypsum to pass through the tubes of the tubular heat exchanger and exchange heat with the sulfur dioxide gas, and drying and calcining to obtain gypsum powder. The invention can directly utilize the waste heat generated by sulfuric acid production without conversion, thoroughly utilizes heat energy, does not waste, converts phosphogypsum into gypsum powder, realizes zero emission of phosphogypsum, realizes maximum utilization of two industrial auxiliary wastes, saves energy, reduces emission and is green and circulated.
Description
Technical Field
The invention relates to the field of gypsum building materials, in particular to a method and a device for producing co-produced gypsum powder by sulfuric acid.
Background
A large amount of waste heat is generated in the sulfuric acid production process (including pyrite, sulfur concentrate and other smelting acid and sulfur acid production), and most of the production of phosphate is carried out by using sulfuric acid, so that many factories are constructed by matching sulfuric acid with phosphating equipment, the byproducts of the phosphate products are phosphogypsum, the stacking of the phosphogypsum occupies a large amount of land resources, and the pollution to the atmosphere, water system and soil is caused by wind erosion and rain erosion, and the construction cost of a phosphogypsum storage yard is quite expensive. The main component of phosphogypsum is calcium sulfate crystal, which contains insoluble phosphorus, water-soluble phosphorus, fluorine, organic matters and other harmful impurities, and the presence of the impurities can lead the phosphogypsum not to be directly used for processing gypsum powder, but the phosphogypsum can be used as construction materials such as plaster, gypsum mortar and the like after being modified and calcined into the gypsum powder.
At present, the utilization of the waste heat in the sulfuric acid production is generally realized by preparing steam by a boiler, the steam is used for pushing a steam turbine to generate power and then is used as a heat source for drying or concentrating, or is directly sold to other users, but the limitation is that when no device is available for the steam, the sulfuric acid cannot be produced due to high production cost, the boiler belongs to dangerous special equipment, has explosion danger, is only used for generating power, has low economic value, has low heat energy utilization efficiency and can cause a considerable energy waste, and the existing calcined phosphogypsum adopts natural gas as fuel, and places without natural gas are limited, so that the digestion path of the phosphogypsum is limited.
In the prior art, few reports on direct utilization of waste heat generated in sulfuric acid production are available, and no report on combined utilization of the waste heat generated in sulfuric acid production and waste side generated in phosphate production is available, so that two industrial side waste can be utilized to the maximum extent, energy conservation and emission reduction are realized, green circulation is realized, and zero emission of phosphogypsum is still a problem to be solved urgently at present.
Disclosure of Invention
The invention aims at: the method for producing the co-production gypsum powder by using the sulfuric acid can directly utilize the waste heat generated by the sulfuric acid production without conversion, thoroughly utilizes the heat energy, does not waste, converts phosphogypsum into gypsum powder, realizes zero emission of phosphogypsum, realizes maximum utilization of two industrial auxiliary wastes, saves energy, reduces emission and is environment-friendly.
The technical scheme adopted by the invention is as follows:
in order to achieve the above purpose, the invention provides a method for producing co-production gypsum powder by sulfuric acid, which takes phosphogypsum as a raw material and takes high-temperature sulfur dioxide gas generated by sulfuric acid production as a heat source, and comprises the following preparation steps:
(1) Mixing phosphogypsum, adding an alkaline material for modification, and filtering the modified phosphogypsum slurry for later use;
(2) And (3) adding the modified phosphogypsum obtained in the previous step into a fluidized bed, introducing high-temperature sulfur dioxide gas generated by sulfuric acid production into the tubes of the tubular heat exchanger, blowing air inwards from the bottom of the fluidized bed, allowing the phosphogypsum to pass through the tubes of the tubular heat exchanger and exchange heat with the sulfur dioxide gas, and drying and calcining to obtain gypsum powder.
Preferably, the alkaline material used in the step (1) is lime milk or alkaline industrial waste. The main component of phosphogypsum is calcium sulfate crystal, which contains insoluble phosphorus, water-soluble phosphorus, fluorine, organic matters and other harmful impurities, and the phosphogypsum cannot be directly used for processing gypsum powder due to the existence of the impurities, but can be used as construction materials such as plaster gypsum, gypsum mortar and the like after being modified and calcined into gypsum powder.
Preferably, the pH value of the phosphogypsum slurry modified in the step (1) is 8-12. The residual acid in the phosphogypsum can be neutralized by adding lime milk or alkaline industrial waste residues, the pH value of the phosphogypsum is adjusted, and the influence of the residual acid in the phosphogypsum on the performance of the phosphogypsum is eliminated.
Preferably, the filtering method in the step (1) comprises the steps of sequentially performing filter pressing, vacuum filtering and centrifugal machine, wherein the free water content in the filtered modified phosphogypsum is less than 25%.
Preferably, the high temperature sulfur dioxide gas in step (1) is flowing in the opposite direction to phosphogypsum. The phosphogypsum and sulfur dioxide gas exchange heat reversely, the temperature of a low temperature area is 80-100 ℃, the temperature of a high temperature area is 160-210 ℃ for drying surface water of the phosphogypsum, the temperature of each area is controlled to be 18-30 minutes by adopting PLC (programmable logic controller) for calcining crystal water of the phosphogypsum, and cold air is fed when the temperature of the areas is exceeded, and the time from feeding to discharging of materials is controlled to be 18-30 minutes.
Preferably, the phosphogypsum in the step (2) is dried and calcined for 18-30 minutes.
Because the phosphogypsum needs to be dried to remove surface water before calcination, the required temperature is low, and the low-level heat can be fully utilized. Through measurement and calculation, each time 1 ton of sulfuric acid is produced, the available waste heat is 85 kilocalories, which is equivalent to the calorific value of 0.121 ton of standard coal, and the pollutant emission of the fire coal is reduced. Taking a device for producing 20 ten thousand tons of sulfuric acid annually as an example, the standard coal can be saved by 2.42 ten thousand tons annually, and meanwhile, the production cost of the sulfuric acid is reduced.
Because the transportation radius of phosphogypsum for producing cement retarder, gypsum brick and the like is limited within the range of 100 km, the gypsum powder processed by the method can be used for producing building materials such as gypsum boards, partition wall materials, gypsum putty and the like, the transportation radius can be extended to 1000 km, the digestion amount of phosphogypsum is enlarged, and by taking a device for producing 20 ten thousand tons of sulfuric acid per year as an example, 48.4 ten thousand tons of phosphogypsum can be produced per year, the problem of environmental pollution caused by phosphogypsum stockpiling is solved, and the aim of reducing emission is fulfilled.
The invention also provides a device for producing co-produced gypsum powder by using sulfuric acid, which comprises a sulfuric acid production device, a fluidized bed and a tubular heat exchanger, wherein the tubular heat exchanger is arranged in the fluidized bed, the sulfuric acid production device is communicated with the tubular heat exchanger through an air inlet pipe, a plurality of combinations of the fluidized bed and the tubular heat exchanger can be connected in series, the top of the fluidized bed is provided with a solid material inlet and a solid material outlet, the solid material outlet is communicated with the solid material inlet of the adjacent fluidized bed through a solid material flow pipeline, the bottom of the fluidized bed is provided with an air inlet, and the tubular heat exchanger is communicated through a gas flow pipeline.
According to the actual needs, the fluidized bed and the tubular heat exchanger are combined in series, phosphogypsum is added from a solid material inlet of the fluidized bed, meanwhile, the solid material is blown by blowing inwards from the bottom of the fluidized bed, high-temperature sulfur dioxide gas in a tube of the tubular heat exchanger is introduced to perform heat exchange with phosphogypsum in the fluidized bed, the fluidized bed enables the phosphogypsum solid material to become fluid under the action of the gas blowing, the material fluid flows between the tubes of the tubular heat exchanger through a solid material flowing pipeline, the indirect heat exchange between the low-temperature fluid outside the tubes and the high-temperature sulfur dioxide gas in the tubes is realized, the effect of calcining the phosphogypsum is achieved, and finally, gypsum powder is obtained from a solid material outlet of the fluidized bed.
Preferably, the sulfuric acid production device is a fluidized bed furnace or a sulfur burning furnace.
Preferably, the combination of the fluidized bed and the tubular heat exchanger may be used in series of 1 to 5. The number of the serial connection can be selected according to actual production requirements, and the phosphogypsum calcining efficiency can be improved to a greater extent and the energy utilization rate can be improved through serial connection.
Preferably, a partition plate is vertically arranged in the middle of the fluidized bed, and the solid material inlet and the solid material outlet of the fluidized bed are distributed on two sides of the partition plate. When phosphogypsum is added into the fluidized bed from the solid material inlet, phosphogypsum cannot directly flow out from the solid material outlet under the blocking effect of the partition plate, so that the short circuit of the materials is avoided, the solid materials can be fully stirred in the fluidized bed, and the calcination is more uniform.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. the invention converts phosphogypsum into gypsum powder by utilizing the waste heat of sulfuric acid production, combines and utilizes two industrial waste pairs, plays respective roles, realizes the maximum utilization rate of the two industrial waste pairs, reduces the stacking of phosphogypsum, realizes the zero emission of phosphogypsum, solves the environmental pollution problem caused by phosphogypsum stacking, saves energy, reduces emission and is green and circulated.
2. The invention opens up a new waste heat utilization mode and channel for producing sulfuric acid by directly utilizing waste heat of sulfuric acid production, solves the limitation brought by the utilization method of producing steam by a boiler, is not limited to drying and calcining phosphogypsum, can be also suitable for drying other solid powder materials, has wider application, does not have special equipment of the danger of the boiler, avoids the dangerous source of explosion, and is safe and reliable and strong in practicability.
3. The waste heat generated by the sulfuric acid production is directly utilized for drying and calcining phosphogypsum, so that the method has the advantages of no secondary conversion, high heat energy utilization rate and no energy waste.
4. The phosphogypsum powder produced by the invention can be used as a building material, can replace natural gypsum powder, reduces or even eliminates exploitation of natural gypsum, realizes a green circular economy mode of sulfur-phosphorus construction, and has strong practicability and economic value.
Drawings
The invention will now be described by way of example and with reference to the accompanying drawings in which:
fig. 1 is a schematic view of the structure of the device of the present invention.
Marked in the figure as: the device comprises a 1-sulfuric acid production device, an 11-air inlet pipe, a 2-fluidized bed, a 21-solid material inlet, a 22-solid material outlet, a 23-partition plate, a 24-air inlet, a 3-tubular heat exchanger, a 4-gas flow pipeline and a 5-solid material flow pipeline.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
A method for producing co-production gypsum powder by using sulfuric acid takes phosphogypsum as a raw material, and high-temperature sulfur dioxide gas generated by sulfuric acid production is taken as a heat source, and comprises the following preparation steps:
(1) Mixing phosphogypsum, adding lime milk into the phosphogypsum slurry for modification until the pH value of the phosphogypsum slurry is 6, sequentially carrying out filter pressing, vacuum filtration and centrifugal machine on the modified phosphogypsum slurry, and finally enabling the free water content in the filtered modified phosphogypsum to be less than 25%;
(2) And (3) adding the modified phosphogypsum obtained in the previous step into the fluidized bed, introducing sulfur dioxide gas into the tubes of the tubular heat exchanger, blowing air inwards from the bottom of the fluidized bed, allowing the phosphogypsum to pass through the tubes of the tubular heat exchanger and perform reverse heat exchange with the sulfur dioxide gas, and drying and calcining for 20 minutes to obtain gypsum powder from the solid material outlet of the fluidized bed.
The utility model provides a device of co-production gesso of sulfuric acid production, includes sulfuric acid production device 1, fluidized bed 2 and tubular heat exchanger 3, tubular heat exchanger 3 establishes in fluidized bed 2, sulfuric acid production device 1 communicates with tubular heat exchanger 3 through intake pipe 11, fluidized bed 2 and tubular heat exchanger 3's combination can establish ties a plurality of, fluidized bed 2 top is equipped with solid material entry 21 and solid material export 22, solid material export 22 communicates with the solid material entry 21 of adjacent fluidized bed 2 through solid material circulation pipeline 5, fluidized bed 2 bottom is equipped with air inlet 24, tubular heat exchanger 3 communicates through gas circulation pipeline 4.
In the embodiment, the sulfuric acid production device 1 is a fluidized bed furnace, and the combination of the fluidized bed 2 and the tubular heat exchanger 3 is used in series connection with 3.
The middle part of the fluidized bed 2 is vertically provided with a baffle plate 23, and the solid material inlet 21 and the solid material outlet 22 of the fluidized bed 2 are distributed on two sides of the baffle plate 23. When phosphogypsum is added into the fluidized bed 2 from the solid material inlet 21, phosphogypsum cannot directly flow out from the solid material outlet 22 under the blocking effect of the partition plate 23, so that the short circuit of materials is avoided, and the solid materials can be fully stirred in the fluidized bed 2, and the calcination is more uniform.
Example 2
A method for producing co-production gypsum powder by using sulfuric acid takes phosphogypsum as a raw material, takes sulfur dioxide gas generated by sulfuric acid production as a heat source, and comprises the following preparation steps:
(1) Mixing phosphogypsum, adding lime milk into the phosphogypsum slurry for modification until the pH value of the phosphogypsum slurry is 9, sequentially carrying out filter pressing, vacuum filtration and centrifugal machine on the modified phosphogypsum slurry, and finally enabling the free water content in the filtered modified phosphogypsum to be less than 25%;
(2) And (3) adding the modified phosphogypsum obtained in the previous step into the fluidized bed, introducing sulfur dioxide gas into the tubes of the tubular heat exchanger, blowing air inwards from the bottom of the fluidized bed, allowing the phosphogypsum to pass through the tubes of the tubular heat exchanger and perform reverse heat exchange with the sulfur dioxide gas, and drying and calcining for 25 minutes to obtain gypsum powder from the solid material outlet of the fluidized bed.
The utility model provides a device of co-production gesso of sulfuric acid production, includes sulfuric acid production device 1, fluidized bed 2 and tubular heat exchanger 3, tubular heat exchanger 3 establishes in fluidized bed 2, sulfuric acid production device 1 communicates with tubular heat exchanger 3 through intake pipe 11, fluidized bed 2 and tubular heat exchanger 3's combination can establish ties a plurality of, fluidized bed 2 top is equipped with solid material entry 21 and solid material export 22, solid material export 22 communicates with the solid material entry 21 of adjacent fluidized bed 2 through solid material circulation pipeline 5, fluidized bed 2 bottom is equipped with air inlet 24, tubular heat exchanger 3 communicates through gas circulation pipeline 4.
In the embodiment, the sulfuric acid production device 1 is a fluidized bed furnace, and 4 combinations of the fluidized bed 2 and the tubular heat exchanger 3 are used in series.
The middle part of the fluidized bed 2 is vertically provided with a baffle plate 23, and the solid material inlet 21 and the solid material outlet 22 of the fluidized bed 2 are distributed on two sides of the baffle plate 23. When phosphogypsum is added into the fluidized bed 2 from the solid material inlet 21, phosphogypsum cannot directly flow out from the solid material outlet 22 under the blocking effect of the partition plate 23, so that the short circuit of materials is avoided, and the solid materials can be fully stirred in the fluidized bed 2, and the calcination is more uniform.
Example 3
A method for producing co-production gypsum powder by using sulfuric acid takes phosphogypsum as a raw material, takes sulfur dioxide gas generated by sulfuric acid production as a heat source, and comprises the following preparation steps:
(1) Mixing phosphogypsum, adding alkaline industrial waste residue into the phosphogypsum slurry for modification until the pH value of the phosphogypsum slurry is 12, and sequentially carrying out filter pressing, vacuum filtration and centrifugal machine on the modified phosphogypsum slurry, so that the free water content in the filtered modified phosphogypsum is less than 25%;
(2) And (3) adding the modified phosphogypsum obtained in the previous step into the fluidized bed, introducing sulfur dioxide gas into the tubes of the tubular heat exchanger, blowing air inwards from the bottom of the fluidized bed, allowing the phosphogypsum to pass through the tubes of the tubular heat exchanger and perform reverse heat exchange with the sulfur dioxide gas, and drying and calcining for 30 minutes to obtain gypsum powder from the solid material outlet of the fluidized bed.
The utility model provides a device of co-production gesso of sulfuric acid production, includes sulfuric acid production device 1, fluidized bed 2 and tubular heat exchanger 3, tubular heat exchanger 3 establishes in fluidized bed 2, sulfuric acid production device 1 communicates with tubular heat exchanger 3 through intake pipe 11, fluidized bed 2 and tubular heat exchanger 3's combination can establish ties a plurality of, fluidized bed 2 top is equipped with solid material entry 21 and solid material export 22, solid material export 22 communicates with the solid material entry 21 of adjacent fluidized bed 2 through solid material circulation pipeline 5, fluidized bed 2 bottom is equipped with air inlet 24, tubular heat exchanger 3 communicates through gas circulation pipeline 4.
In the embodiment, the sulfuric acid production device 1 is a sulfur incinerator, and 5 combinations of the fluidized bed 2 and the tubular heat exchanger 3 are connected in series for use.
The middle part of the fluidized bed 2 is vertically provided with a baffle plate 23, and the solid material inlet 21 and the solid material outlet 22 of the fluidized bed 2 are distributed on two sides of the baffle plate 23. When phosphogypsum is added into the fluidized bed 2 from the solid material inlet 21, phosphogypsum cannot directly flow out from the solid material outlet 22 under the blocking effect of the partition plate 23, so that the short circuit of materials is avoided, and the solid materials can be fully stirred in the fluidized bed 2, and the calcination is more uniform.
Claims (9)
1. The method for producing co-produced gypsum powder by using sulfuric acid is characterized by comprising a device for producing co-produced gypsum powder by using sulfuric acid, wherein the device comprises a sulfuric acid production device (1), a fluidized bed (2) and a tubular heat exchanger (3), the tubular heat exchanger (3) is arranged in the fluidized bed (2), the sulfuric acid production device (1) is communicated with the tubular heat exchanger (3) through an air inlet pipe (11), a plurality of combinations of the fluidized bed (2) and the tubular heat exchanger (3) can be connected in series, a solid material inlet (21) and a solid material outlet (22) are arranged at the top of the fluidized bed (2), the solid material outlet (22) is communicated with the solid material inlet (21) of an adjacent fluidized bed (2) through a solid material circulation pipeline (5), an air inlet (24) is arranged at the bottom of the fluidized bed (2), and the tubular heat exchanger (3) is communicated through a gas circulation pipeline (4);
when the device for producing co-production gypsum powder by adopting sulfuric acid is used for co-producing gypsum powder, the concrete method comprises the following steps:
phosphogypsum is used as a raw material, and high-temperature sulfur dioxide gas generated in sulfuric acid production is used as a heat source, and the method comprises the following preparation steps: (1) Mixing phosphogypsum, adding an alkaline material for modification, and filtering the modified phosphogypsum slurry to obtain modified phosphogypsum; (2) And (3) adding the modified phosphogypsum obtained in the step (1) into a fluidized bed, introducing high-temperature sulfur dioxide gas generated by sulfuric acid production into the tubes of the tubular heat exchanger, blowing air inwards from the bottom of the fluidized bed, allowing the phosphogypsum to pass through the tubes of the tubular heat exchanger and exchange heat with the sulfur dioxide gas, and drying and calcining to obtain gypsum powder.
2. The method for producing co-produced gypsum powder according to claim 1, wherein the alkaline material used in the step (1) is lime milk or alkaline industrial waste.
3. The method for producing co-produced gypsum powder according to claim 1, wherein the pH of the phosphogypsum slurry modified in the step (1) is 6 to 12.
4. The method for producing co-produced gypsum powder according to claim 1, wherein the filtration method in step (1) comprises sequentially performing pressure filtration, vacuum filtration and centrifuge, and the free water content of the filtered modified phosphogypsum is less than 25%.
5. The method for producing co-produced gypsum powder according to claim 1, wherein the high temperature sulfur dioxide gas in the step (1) is opposite to the flow direction of phosphogypsum, and the tubular heat exchanger is divided into a high temperature zone and a low temperature zone in sequence along the flow direction of sulfur dioxide gas.
6. The method for producing co-produced gypsum powder according to claim 1, wherein the phosphogypsum drying and calcining time in the step (2) is 18-30 minutes.
7. The method for producing co-produced gypsum powder according to claim 1, wherein the sulfuric acid production device (1) is a fluidized bed furnace or a sulfur burner.
8. A method for producing co-produced gypsum powder according to claim 1, wherein the combination of the fluidized bed (2) and the tubular heat exchanger (3) can be used in series 1 to 5.
9. The method for producing co-produced gypsum powder according to claim 1, wherein a partition plate (23) is vertically arranged in the middle of the fluidized bed (2), and the solid material inlet (21) and the solid material outlet (22) of the fluidized bed (2) are distributed on two sides of the partition plate (23).
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201261720Y (en) * | 2008-07-07 | 2009-06-24 | 昆明理工大学 | Integrated apparatus for utilizing phosphogypsum decomposition circulating fluid bed residual heat |
| CN102089071A (en) * | 2008-05-09 | 2011-06-08 | 克劳迪亚斯.彼得斯技术有限责任公司 | Calcination method and facility |
| CN102442650A (en) * | 2011-10-18 | 2012-05-09 | 中国石油化工集团公司 | Method for producing sulfuric acid and co-producing calcium carbide by phosphogypsum |
| CN103936313A (en) * | 2014-05-08 | 2014-07-23 | 瓮福（集团）有限责任公司 | Process for preparing building gypsum powder from phosphogypsum |
| CN106630709A (en) * | 2016-09-26 | 2017-05-10 | 广西亿品投资有限公司 | Method for drying phosphogypsum with sulfuric acid tail gas |
| WO2017173717A1 (en) * | 2016-04-08 | 2017-10-12 | 成都千砺金科技创新有限公司 | Method for directly using phosphogypsum decomposition gas in wet phosphoric acid production |
| CN107651870A (en) * | 2017-11-07 | 2018-02-02 | 河南建筑材料研究设计院有限责任公司 | A kind of suspension air-flowing type ardealite integrated treatment unit and method |
| CN107720708A (en) * | 2017-11-21 | 2018-02-23 | 宜昌鄂中化工有限公司 | A kind of acid production with sulphur waste heat is used for the device and method of ardealite comprehensive utilization |
| CN207451624U (en) * | 2017-11-21 | 2018-06-05 | 宜昌鄂中化工有限公司 | A kind of acid production with sulphur waste heat is used for the device of ardealite comprehensive utilization |
| CN109485281A (en) * | 2018-12-29 | 2019-03-19 | 四川绵竹市盘龙矿物质有限责任公司 | A kind of method of ardealite online production building material |
| CN210030476U (en) * | 2019-04-26 | 2020-02-07 | 四川绵竹市盘龙矿物质有限责任公司 | Device for co-producing gypsum powder in sulfuric acid production |
-
2019
- 2019-04-26 CN CN201910343446.7A patent/CN109912245B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102089071A (en) * | 2008-05-09 | 2011-06-08 | 克劳迪亚斯.彼得斯技术有限责任公司 | Calcination method and facility |
| CN201261720Y (en) * | 2008-07-07 | 2009-06-24 | 昆明理工大学 | Integrated apparatus for utilizing phosphogypsum decomposition circulating fluid bed residual heat |
| CN102442650A (en) * | 2011-10-18 | 2012-05-09 | 中国石油化工集团公司 | Method for producing sulfuric acid and co-producing calcium carbide by phosphogypsum |
| CN103936313A (en) * | 2014-05-08 | 2014-07-23 | 瓮福（集团）有限责任公司 | Process for preparing building gypsum powder from phosphogypsum |
| WO2017173717A1 (en) * | 2016-04-08 | 2017-10-12 | 成都千砺金科技创新有限公司 | Method for directly using phosphogypsum decomposition gas in wet phosphoric acid production |
| CN106630709A (en) * | 2016-09-26 | 2017-05-10 | 广西亿品投资有限公司 | Method for drying phosphogypsum with sulfuric acid tail gas |
| CN107651870A (en) * | 2017-11-07 | 2018-02-02 | 河南建筑材料研究设计院有限责任公司 | A kind of suspension air-flowing type ardealite integrated treatment unit and method |
| CN107720708A (en) * | 2017-11-21 | 2018-02-23 | 宜昌鄂中化工有限公司 | A kind of acid production with sulphur waste heat is used for the device and method of ardealite comprehensive utilization |
| CN207451624U (en) * | 2017-11-21 | 2018-06-05 | 宜昌鄂中化工有限公司 | A kind of acid production with sulphur waste heat is used for the device of ardealite comprehensive utilization |
| CN109485281A (en) * | 2018-12-29 | 2019-03-19 | 四川绵竹市盘龙矿物质有限责任公司 | A kind of method of ardealite online production building material |
| CN210030476U (en) * | 2019-04-26 | 2020-02-07 | 四川绵竹市盘龙矿物质有限责任公司 | Device for co-producing gypsum powder in sulfuric acid production |
Non-Patent Citations (1)
| Title |
|---|
| 磷石膏净化及石膏煅烧工艺综述;马行美;硫磷设计与粉体工程(第05期);第18-21页 * |
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