CN112876110A - Gypsum powder production system and process - Google Patents
Gypsum powder production system and process Download PDFInfo
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- CN112876110A CN112876110A CN202110142121.XA CN202110142121A CN112876110A CN 112876110 A CN112876110 A CN 112876110A CN 202110142121 A CN202110142121 A CN 202110142121A CN 112876110 A CN112876110 A CN 112876110A
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- 239000010440 gypsum Substances 0.000 claims abstract description 81
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 81
- 239000000843 powder Substances 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 47
- 238000001354 calcination Methods 0.000 claims abstract description 31
- 239000002994 raw material Substances 0.000 claims abstract description 26
- 238000001035 drying Methods 0.000 claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 claims abstract description 23
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 238000000265 homogenisation Methods 0.000 claims abstract description 15
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 12
- 230000023556 desulfurization Effects 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 37
- 238000000227 grinding Methods 0.000 claims description 15
- 239000000428 dust Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 229910021389 graphene Inorganic materials 0.000 claims 1
- 230000036314 physical performance Effects 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 5
- 238000006467 substitution reaction Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 238000000498 ball milling Methods 0.000 description 2
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
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Classifications
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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
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
- C04B11/262—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke waste gypsum other than phosphogypsum
- C04B11/264—Gypsum from the desulfurisation of flue gases
-
- 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
- C04B11/00—Calcium sulfate cements
- C04B11/005—Preparing or treating the raw materials
-
- 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
- C04B11/00—Calcium sulfate cements
- C04B11/007—After-treatment of the dehydration products, e.g. aging, stabilisation
-
- 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
- C04B11/00—Calcium sulfate cements
- C04B11/02—Methods and apparatus for dehydrating gypsum
- C04B11/028—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained
-
- 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
- C04B11/00—Calcium sulfate cements
- C04B11/02—Methods and apparatus for dehydrating gypsum
- C04B11/028—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained
- C04B11/036—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained for the dry process, e.g. dehydrating in a fluidised bed or in a rotary kiln, i.e. to obtain beta-hemihydrate
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention relates to the technical field of desulfurization gypsum comprehensive treatment, in particular to a gypsum powder production system and a process. The system comprises a raw material bin, a rotary dryer, a fluidized bed furnace, a cooling heat exchanger, a ball mill and a powder bin which are sequentially connected, wherein the discharge end of the rotary dryer is connected with the feed end of a scattering machine through a PU chain conveyor, the discharge end of the scattering machine is connected with the feed end of the fluidized bed furnace, and a homogenizing bin is also arranged between the ball mill and the powder bin; the process adopts the processes of high-temperature pre-drying and medium-temperature calcining, the production system has high thermal efficiency and good product quality, simultaneously ensures the stability of the calcining process, and avoids the problems of over-burning or under-burning; the hard blocks possibly generated in the drying and transporting processes of the raw materials are scattered by scattering, so that the stability of the calcining process is facilitated; the phases tend to be homogenized through the homogenization of the homogenization bin, the content of the semi-hydrated gypsum is increased, the physical performance of the gypsum powder is improved, and the product quality is improved.
Description
Technical Field
The invention relates to the technical field of desulfurization gypsum comprehensive treatment, in particular to a gypsum powder production system and a process.
Background
The main components of the desulfurized gypsum, also called flue gas desulfurized gypsum, sulfur gypsum or FGD gypsum, are the same as natural gypsum, and are calcium sulfate dihydrate, the desulfurized gypsum is a byproduct of FGD process, and the FGD process is a technology for recovering sulfur dioxide in flue gas of fire coal or oil by using lime-limestone. The comprehensive treatment of the desulfurized gypsum is very significant, the further development of the national environmental-friendly circular economy is effectively promoted, the mining amount of the ore paste is greatly reduced, and the resources are protected.
At present, the method of one-step method, two-step method, calcination and grinding and the like are commonly adopted for producing gypsum powder by using desulfurized gypsum. The one-step method is a treatment process integrating drying and calcining, the process flow is simple, but the retention time of materials in a calcining furnace is long, the calcining in the furnace is not uniform due to the limited conditions, the phenomena of overburning and underburning are easy to occur, and the calcined raw materials contain a large amount of soot; the two-step method is drying and then calcining, the process shortens the calcining time, but the internal crystal structure of the material cannot be changed, and the calcined material is agglomerated, so that the phenomenon of under-burning or over-burning is easy to occur, and the performance of the produced gypsum powder is unstable; by adopting the method of calcining and grinding, different phase change processes can occur when grinding is carried out in a high-temperature environment, thereby influencing the quality of the building gypsum. Based on the above, the Chinese patent application with the patent publication number of CN105384372A provides a method and a device for preparing building gypsum from desulfurized gypsum, comprising the following steps of drying desulfurized gypsum raw material by hot air, controlling the drying temperature between 110 ℃ and 130 ℃, and ensuring that the content of attached water is less than or equal to 3 percent after drying; calcining the dried gypsum at the temperature of between 150 and 160 ℃ for 20 to 40 min; and (3) cooling the calcined gypsum to 50-60 ℃, and sending the cooled material to a ball mill for grinding, wherein the particle size of the ground material is more than 200 meshes. But the method still has the defects of poor stability of the calcining process and poor product quality.
Disclosure of Invention
Aiming at the problems of low product quality and unstable calcining process in the existing gypsum powder production, the invention provides a gypsum powder production system and a gypsum powder production process, which ensure the stability of the calcining process, and have good product quality and good particle grading.
In a first aspect, the invention provides a gypsum powder production system, which comprises a raw material bin, a rotary dryer, a fluidized bed furnace, a cooling heat exchanger, a ball mill and a powder bin which are sequentially connected, wherein a discharge end of the rotary dryer is connected with a feed end of a scattering machine through a PU chain conveyor, the discharge end of the scattering machine is connected with the feed end of the fluidized bed furnace, and a homogenizing bin is further arranged between the ball mill and the powder bin.
Furthermore, a metering pump is arranged between the breaker and the fluidized bed furnace.
Furthermore, the rotary dryer and the ball mill are both connected with an air box pulse type dust remover. The dust brought out by the gypsum powder production system is collected and purified by the air box pulse type dust remover and then discharged.
Further, the ball mill is a windshield ball mill. Drying and grinding the desulfurized gypsum by hot air.
The invention also aims to provide a production method of gypsum powder, which comprises the following steps:
(1) delivering the desulfurization gypsum raw material into a raw material bin, and drying the metered desulfurization gypsum raw material in a rotary dryer at the drying temperature of 150-;
(2) the dried desulfurized gypsum enters a scattering machine for scattering and then enters a fluidized bed roaster for calcination, wherein the calcination temperature is 120-140 ℃;
(3) the calcined material is cooled through a cooling heat exchanger, then enters a ball mill for grinding, and enters a homogenizing silo for homogenizing after grinding;
(4) and (5) transporting the homogenized material to a powder bin to obtain gypsum powder.
Wherein,
and (3) heating the fluidized bed furnace by adopting heat conducting oil and high-temperature hot air simultaneously in the step (2). The heat source can conveniently remove crystal water, and ensures that the gypsum powder meets the quality index.
The scattering rotating speed in the step (2) is 800-. The hard blocks possibly generated in the drying and transporting processes of the materials are scattered through scattering, so that the stability of the calcining process is facilitated.
The temperature reduction process in the step (3) is to cool the mixture to 70-85 ℃ for 30-60 min. Through the cooling process, the fluidity of the gypsum powder is slowed down, and the stability and the quality of later-stage grinding are ensured.
The particle size of the material ground in the step (3) is 200-250 meshes.
The homogenization process in the step (3) is physical homogenization, stacking homogenization is carried out for 24-45h, and the homogenization temperature is 35-50 ℃.
The beneficial effect of the invention is that,
(1) because the desulfurized gypsum has the characteristic of high water content, the invention adopts the processes of high-temperature pre-drying and medium-temperature calcining, the production system has high thermal efficiency and good product quality, simultaneously ensures the stability of the calcining process, and avoids the problems of over-burning or under-burning; the hard blocks possibly generated in the drying and transporting processes of the raw materials are scattered by scattering, so that the stability of the calcining process is facilitated; the phases tend to be homogenized through homogenization in the homogenization bin, so that the content of the semi-hydrated gypsum is increased, the physical properties of gypsum powder are improved, and the product quality is improved;
(2) the whiteness of the gypsum powder prepared by the method is improved to more than 60, the flexural strength is more than 4.2, the compressive strength is more than 7.7, and the service performance is greatly improved.
Drawings
FIG. 1 is a schematic view of a landplaster production system according to example 1 of the present invention;
in the figure, 1, a raw material bin; 2. a rotary dryer; 3. a PU chain conveyor; 4. a breaker; 5. a metering pump; 6. a fluidized bed furnace; 7. a cooling heat exchanger; 8. a ball mill; 9. a homogenizing bin; 10. and a powder bin.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A gypsum powder production system comprises a raw material bin 1, a rotary dryer 2, a scattering machine 4, a fluidized bed furnace 6, a cooling heat exchanger 7, a ball mill 8, a homogenizing bin 9 and a powder bin 10 which are sequentially connected in sequence from front to back, wherein the ball mill 8 is a windshield type ball mill, the drying and grinding of desulfurized gypsum are carried out by hot air, and other devices adopt conventional devices in the prior art or are improved; the desulfurized gypsum raw material in the raw material bin 1 is conveyed by a belt conveyor to enter a rotary dryer 2, the material is conveyed by a discharge end of the rotary dryer 2 through a PU chain conveyor 3 to enter a scattering machine 4 for scattering, and hard blocks possibly appearing in the drying and transporting processes of the material are scattered by scattering, so that the stability of the calcining process is facilitated; the scattered materials are metered by a metering pump 5 and then enter a fluidized bed furnace 6 for calcination, and the fluidized bed furnace 6 occupies a small area and is economical and practical; the calcined material is cooled by a cooling heat exchanger 7, the temperature of the material is reduced to a temperature with lower activity, the fluidity is reduced, the stability of ball milling is ensured, then the calcined material enters a ball mill 8 for grinding, the ground material enters a homogenizing bin 9 for homogenizing, the material phase tends to be homogenized, the content of semi-hydrated gypsum is improved, the physical property of gypsum powder is improved, the product quality is improved, and the calcined material enters a powder bin 10 after the homogenizing is finished to obtain a final gypsum powder finished product.
Example 2
On the basis of the embodiment 1, the rotary dryer and the ball mill are both connected with an air box pulse type dust remover. The gas tank pulse type dust remover is arranged above the place where dust is easy to generate, and the dust brought out in the gypsum powder production system is collected and purified by the gas tank pulse type dust remover and then discharged.
Example 3
A production method of gypsum powder comprises the following steps:
(1) feeding the desulfurization gypsum raw material into a raw material bin, and feeding the metered desulfurization gypsum raw material into a rotary dryer for drying at the drying temperature of 150 ℃ for 2 hours;
(2) the dried desulfurized gypsum enters a scattering machine to be scattered, the scattering speed is 1200r/min, the scattering time is 3min, and then the desulfurized gypsum enters a fluidized bed furnace to be calcined, wherein the fluidized bed furnace adopts heat conduction oil and high-temperature hot air to heat simultaneously, and the calcining temperature is 120 ℃;
(3) cooling the calcined material in a cooling heat exchanger to 85 ℃ for 30min, then grinding the calcined material in a ball mill, wherein the particle size of the ground material is 200-250 meshes, the ground material is homogenized in a homogenizing silo for 24h after being stacked, and the homogenizing temperature is 50 ℃;
(4) and (5) transporting the homogenized material to a powder bin to obtain gypsum powder.
Example 4
A production method of gypsum powder comprises the following steps:
(1) feeding the desulfurization gypsum raw material into a raw material bin, and feeding the metered desulfurization gypsum raw material into a rotary dryer for drying at the drying temperature of 170 ℃ for 1.2 h;
(2) the dried desulfurized gypsum enters a scattering machine to be scattered, the scattering speed is 1100r/min, the scattering time is 40min, and then the desulfurized gypsum enters a fluidized bed furnace to be calcined, wherein the fluidized bed furnace adopts heat conduction oil and high-temperature hot air to heat simultaneously, and the calcining temperature is 140 ℃;
(3) cooling the calcined material in a cooling heat exchanger to 70 ℃ for 45min, then grinding the calcined material in a ball mill, wherein the particle size of the ground material is 200-250 meshes, the ground material is homogenized in a homogenizing silo for 36h after being stacked, and the homogenizing temperature is 45 ℃;
(4) and (5) transporting the homogenized material to a powder bin to obtain gypsum powder.
Example 5
A production method of gypsum powder comprises the following steps:
(1) feeding the desulfurization gypsum raw material into a raw material bin, and feeding the metered desulfurization gypsum raw material into a rotary dryer for drying at 165 ℃ for 1 h;
(2) the dried desulfurized gypsum enters a scattering machine to be scattered, the scattering speed is 1200r/min, the scattering time is 3min, and then the desulfurized gypsum enters a fluidized bed furnace to be calcined, wherein the fluidized bed furnace adopts heat conduction oil and high-temperature hot air to heat simultaneously, and the calcining temperature is 120 ℃;
(3) cooling the calcined material in a cooling heat exchanger to 85 ℃ for 30min, then grinding the calcined material in a ball mill, wherein the particle size of the ground material is 200-250 meshes, the ground material is homogenized in a homogenizing silo for 45h after being stacked, and the homogenizing temperature is 35 ℃;
(4) and (5) transporting the homogenized material to a powder bin to obtain gypsum powder.
Comparative example 1
Compared with the embodiment 3, the difference is that the drying temperature in the step (1) is 120 ℃, the drying time is 30min, and the calcining temperature is 170 ℃.
Comparative example 2
Compared with the embodiment 3, the difference is that the material does not need to be homogenized and directly enters the powder bin after ball milling.
Test example 1
The performance of the gypsum powders obtained in examples 3 to 5 and comparative examples 1 to 2 was measured, and the results are shown in Table 1.
Table 1 shows the performance indexes of the obtained gypsum powder
| Whiteness degree | Compressive strength | Flexural strength | |
| Example 3 | 62 | 7.89 | 4.21 |
| Example 4 | 60 | 7.75 | 4.22 |
| Example 5 | 62 | 7.82 | 4.20 |
| Comparative example 1 | 58 | 7.45 | 3.63 |
| Comparative example 2 | 57 | 7.50 | 3.57 |
As can be seen from Table 1, the invention adopts the processes of high-temperature pre-drying and medium-temperature calcining, the production system has high thermal efficiency and good product quality, simultaneously ensures the stability of the calcining process, and avoids the problems of over-burning or under-burning; the hard blocks possibly generated in the drying and transporting processes of the raw materials are scattered by scattering, so that the stability of the calcining process is facilitated; the phases tend to be homogenized through the homogenization of the homogenization bin, the content of the semi-hydrated gypsum is increased, the physical performance of the gypsum powder is improved, and the product quality is improved.
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a production system of gesso, is including former feed bin (1), rotary dryer (2), fluidized bed furnace (6), cooling heat exchanger (7), ball mill (8) and powder storehouse (10) that connect gradually, its characterized in that, the feed end of scattering machine (4) is connected through PU chain conveyor (3) to the discharge end of rotary dryer (2), the feed end of fluidized bed furnace (6) is connected to the discharge end of scattering machine (4), still is provided with homogenization storehouse (9) between ball mill (8) and powder storehouse (10).
2. A gypsum powder production system according to claim 1, wherein a metering pump (5) is further provided between the disintegrator (4) and the fluidized bed furnace (6).
3. A gypsum powder production system according to claim 1, wherein the rotary dryer (2) and the ball mill (8) are connected to an air box pulse dust collector.
4. A gypsum powder production system according to claim 1, wherein said ball mill (8) is a windshield ball mill.
5. A process for producing gypsum powder by using the production system as claimed in any one of claims 1 to 4, comprising the steps of:
(1) the desulfurization gypsum raw material is sent to a raw material bin (1), and the metered desulfurization gypsum raw material enters a rotary dryer (2) to be dried, wherein the drying temperature is 150-;
(2) the dried desulfurized gypsum enters a scattering machine (4) for scattering and then enters a fluidized bed furnace (6) for calcining, wherein the calcining temperature is 120-140 ℃;
(3) the calcined material is cooled by a cooling heat exchanger (7), then enters a ball mill (8) for grinding, and enters a homogenizing bin (9) for homogenizing after grinding;
(4) and (3) transporting the homogenized material to a powder bin (10) to obtain gypsum powder.
6. The process for producing gypsum powder according to claim 5, wherein the fluidized bed furnace in the step (2) is simultaneously heated with heat transfer oil and high-temperature hot air.
7. The process for producing gypsum powder as claimed in claim 5, wherein the scattering rotation speed in step (2) is 800-1200r/min, and the scattering time is 30-45 min.
8. The process for producing gypsum powder as claimed in claim 5, wherein the temperature reduction in step (3) is carried out by cooling to 70-85 ℃ for 30-60 min.
9. The process for producing gypsum powder as claimed in claim 5, wherein the particle size of the material ground in step (3) is 200-250 mesh.
10. The method for preparing a green and environment-friendly graphene solar cell as claimed in claim 5, wherein the homogenization process in the step (3) is physical homogenization, stacking homogenization is carried out for 24-45h, and the homogenization temperature is 35-50 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113880470A (en) * | 2021-09-30 | 2022-01-04 | 泰安路发节能环保设备有限公司 | Novel process and equipment for producing building gypsum |
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| CN105384372A (en) * | 2015-11-27 | 2016-03-09 | 山东先罗输送机械有限公司 | Method and device for preparing building gypsum from desulfurized gypsum |
| CN205223025U (en) * | 2015-11-27 | 2016-05-11 | 山东先罗输送机械有限公司 | Desulfurized gypsum preparation building gypsum's device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113880470A (en) * | 2021-09-30 | 2022-01-04 | 泰安路发节能环保设备有限公司 | Novel process and equipment for producing building gypsum |
| CN113880470B (en) * | 2021-09-30 | 2023-03-07 | 泰安路发节能环保设备有限公司 | Process and equipment for producing building gypsum |
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