CN112279536B - Production process of industrial byproduct gypsum - Google Patents
Production process of industrial byproduct gypsum Download PDFInfo
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- CN112279536B CN112279536B CN202011222525.1A CN202011222525A CN112279536B CN 112279536 B CN112279536 B CN 112279536B CN 202011222525 A CN202011222525 A CN 202011222525A CN 112279536 B CN112279536 B CN 112279536B
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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
- C04B11/02—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
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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
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Abstract
The invention discloses a production process of industrial byproduct gypsum, which comprises a feeding system, a drying and calcining system, a cooling system, a waste heat recycling system and a storage system. The process realizes tight air locking of feeding and discharging, high heat efficiency of drying and calcining, cyclic utilization of waste heat, energy conservation and environmental protection by introducing advanced equipment such as a plug-in plate type air locking valve, a movable feeder, a novel drying and calcining kiln, an air heater, an air cooling rotary cooler and the like. The system runs stably, and the product quality is reliable.
Description
Technical Field
The invention relates to a production process of industrial byproduct gypsum.
Background
At present, the resource utilization of industrial byproduct gypsum has attracted people's high attention. The utilization of the industrial by-product gypsum requires that the industrial by-product gypsum is firstly dried and calcined to remove moisture in the industrial by-product gypsum. At present, rotary equipment heated by coal is generally adopted for drying and calcining industrial by-product gypsum, and the equipment has the problems of high energy consumption and low yield.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the defects of the prior art, the invention provides a production process of industrial byproduct gypsum.
The technical scheme is as follows: a production process of industrial byproduct gypsum comprises the following steps: the system comprises a feeding system, a drying and calcining system, a cooling system, a waste heat recycling system and a storage system; the method comprises the following specific steps:
the feeding system comprises the following components: the raw materials are industrial by-products gypsum, phosphogypsum and the like, the materials have certain humidity and viscosity, and are sent to the next procedure through a feeding belt, and a discharge hole of the feeding belt is connected with a plug-in plate type air locking valve; a movable feeder is connected behind the inserting plate type air locking valve, the movable feeder is of a full-sealing structure, an air induction port is formed in the side face of the movable feeder, and hot air in the drying and calcining kiln is sucked out by the air induction port through countercurrent flow and enters a drying dust remover; the return material of the drying dust remover is dry powder, the dry powder is returned to the feeding belt through a return material screw 1, and the dry powder is mixed with the wet sticky material;
the drying and calcining system comprises the following components: the drying and calcining kiln is used for dehydrating the attached water and the crystal water of the industrial byproduct gypsum, a plurality of steam pipes are distributed in the drying and calcining kiln and divided into three sections, the first section is a preheating section from a feeding end, the first section is a light pipe, the pipe wall of the section is thickened, the inner wall of the corresponding cylinder is lined with a stainless steel plate, the stainless steel plate is anticorrosive and anti-sticking to form blocks, and a vibrator is distributed on the outer wall of the cylinder to prevent the material of the cylinder wall from being stuck; the second section is a drying section, and an axial shovelling plate is welded on the drying section, so that the heat exchange area of the material is increased, and the material lifting and distributing function is realized, and the material is fully subjected to heat exchange with a heat source; the third section is a calcining section which is welded with an annular heat exchange sheet, so that the heat exchange area of the material is increased, and the crystal water of the material is calcined and dehydrated;
steam in a steam pipe in the drying calcining kiln enters the steam pipe through a rotary joint, the steam is changed into condensed water after heat exchange and is discharged from the rotary joint, a discharge port of the drying calcining kiln is connected with an air locking discharger, the entering of cold air outside the system is reduced, the temperature of materials discharged from the drying calcining kiln is about 150 ℃, and the materials enter a cooling system from the air locking discharger through a spiral conveyor 1 and a lifting machine 1;
the cooling system is as follows: the air-cooled rotary cooler is internally divided into a contact type cooling mode and a non-contact type cooling mode, the contact type cooling mode is that the air in the air-cooled rotary cooler directly exchanges heat with materials, and dust-containing gas after heat exchange is filtered and discharged by a dust remover; the non-contact cooling mode is that a heat exchange pipeline in the air-cooled rotary cooler is in contact heat exchange with materials, and hot air in the pipeline is led to the air heater; the air-cooled rotary cooler can reduce the temperature of the materials to be below 80 ℃, so that the materials discharged from the drying and calcining kiln are prevented from entering a pre-grinding bin and then being calcined at a low temperature, the characteristics of the materials calcined at the low temperature are unstable, and the waste rate is high;
the waste heat recycling system comprises the following components: high-temperature clean gas in the heat exchange tube of the air-cooled rotary cooler is recycled by a cooling fan, enters a heater and is continuously heated to more than 150 ℃, and then enters a drying and calcining kiln to dry the materials for recycling, so that the gas consumption is saved;
the dust-containing gas outlet of the air-cooled rotary cooler is connected with a cooling dust remover, and returned materials enter the elevator 2 through the return material screw 2 and enter the pre-grinding bin.
The discharge port of the air-cooled rotary cooler is connected with a vibrating screen, and impurities, blocks and the like in the materials are further screened and purified. The discharged material enters a lifter 2 through a screw conveyor 2 and enters a pre-grinding bin.
The storage system is as follows: the pre-grinding bin is divided into two bins, materials are divided into two pre-grinding bins through the material dividing valve, the materials enter the two pre-grinding bins respectively, the pre-grinding bin is used for storing stable materials after the system operates stably due to unstable material characteristics of the system during initial operation and before shutdown, and the pre-grinding bin is used for storing head and tail materials; because the properties of the head and tail materials are unstable, the head and tail materials are mixed with stable materials in a proper proportion by two weighing scales, and the head and tail materials are fully utilized on the premise of ensuring the product quality;
the gate valve, the star-shaped ash discharge valve and the metering scale are respectively connected below the two pre-grinding bins, and the arrangement of the double valves is convenient to maintain and replace, and can accurately control the amount of materials falling into the metering scale, so that the materials are prevented from impacting the metering scale to influence the precision of the metering scale; a dust remover of the pre-grinding bin collects dust of the pre-grinding bin and falls into the pre-grinding bin; the structure of the modified mill is divided into two forms: needle milling and ball milling. After the gypsum is subjected to modification grinding, the particle size distribution is more reasonable, the specific surface area is increased, the strength is greatly improved, and the volume weight is obviously reduced. Then the materials enter a screw conveyer 3, a lifter 3 finally enters a finished product bin, and a modified mill dust remover collects dust and collects the dust into the screw conveyer 3.
As an optimization: the inserting plate type air locking valve and the air locking discharger have the air locking effect, the entering of cold air outside the system is reduced, once the air leakage is large, the effect of drying materials is influenced, and the inserting plate air locking valve can effectively realize the discharging of wet and sticky industrial byproduct gypsum without material blockage.
Has the advantages that: the invention has the following advantages:
1. the inserting plate air locking valve has the air locking function, so that cold air outside the system is reduced, the material drying effect is influenced once the air leakage is large, and the inserting plate air locking valve can effectively realize the blanking of wet and sticky industrial byproduct gypsum without blocking.
2. The movable feeder is of a full-sealing structure and is also used for locking air and reducing the entering of the air quantity outside the system, the side surface of the movable feeder is provided with an air inducing port, and the air inducing port sucks out hot air in the drying calcining kiln through countercurrent and then enters a drying dust remover.
3. The return material of the drying dust remover is dry powder and returns to the feeding belt through the return material screw 1. The dry powder is mixed with the wet sticky material, so that the humidity and the stickiness of the material can be reduced, and the adhesion phenomenon of the material in equipment is well improved.
4. The drying and calcining kiln of the invention is used for drying and treating the attached water and the crystal water of the industrial byproduct gypsum. The drying and calcining kiln is internally distributed with a plurality of steam pipes which are divided into three sections, the first section is a preheating section from a feeding end, the first section is a light pipe, the pipe wall of the section is thickened, the inner wall of the corresponding cylinder body is lined with a stainless steel plate, the stainless steel plate is anticorrosive and anti-sticking to form blocks, the outer wall of the cylinder body is distributed with a vibrator, and the material adhesion of the cylinder wall is prevented; the second section is a drying section, and an axial shovelling plate is welded on the drying section, so that the heat exchange area of the material is increased, and the material lifting and distributing function is realized, and the material is fully subjected to heat exchange with a heat source; the third section is a calcining section, and an annular heat exchange sheet is welded on the calcining section, so that the heat exchange area of the material is increased, and the material crystal water is calcined and dehydrated.
5. The air-cooled rotary cooler can reduce the temperature of the materials to be below 80 ℃, so that the materials discharged from the drying and calcining kiln are prevented from being calcined at low temperature after entering the storage bin, the characteristics of the materials calcined at low temperature are unstable, and the waste rate is high.
6. The cooling system of the present invention is classified into a contact cooling system and a non-contact cooling system. The feeding part is provided with a forced feeding screw which rotates along with the cylinder, and besides the anti-blocking material, a power mechanism of the screw is also saved.
Drawings
FIG. 1 is a schematic view of the flow structure of the present invention;
FIG. 2 is a schematic diagram of the first half of a top view configuration A-A of the present invention;
FIG. 3 is a schematic diagram of the second half of the top view configuration A-A of the present invention;
FIG. 4 is a schematic diagram of the first half of the left view structure B-B of the present invention;
FIG. 5 is a schematic diagram of the second half of the left view structure B-B of the present invention;
FIG. 6 is a schematic diagram of the first half of the right-view structure C-C of the present invention;
FIG. 7 is a schematic diagram of the second half of the right view structure C-C of the present invention;
wherein, 1, a feeding belt; 2. a plug board air locking valve; 3. a movable feeder; 4. drying and calcining kiln; 5. drying the dust remover; 6. a return material screw 1; 7. a rotary joint; 8. a wind locking discharge valve; 9. a screw conveyor 1; 10. a hoist 1; 11. air-cooling rotary cooling machine; 12. cooling the dust remover; 13. a return material screw 2; 14. a cooling fan; 15. a heater; 16. vibrating screen; 17. a screw conveyor 2; 18. a hoist 2; 19. a material distributing valve; 20. pre-grinding bins 20-1 and 20-2; 21. gate valves 21-1 and 21-2; 22. star-shaped cinder valves 22-1 and 22-2; 23. weighing 23-1 and 23-2; 24. a dust remover of the pre-grinding bin; 25. modifying and grinding; 26. a modified grinding dust remover; 27. a screw conveyor 3; 28. a hoist 3; 29. and (6) a finished product bin.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below so that those skilled in the art can better understand the advantages and features of the present invention, and thus the scope of the present invention will be more clearly defined. The embodiments described herein are only a few embodiments of the present invention, rather than all embodiments, and all other embodiments that can be derived by one of ordinary skill in the art without inventive faculty based on the embodiments described herein are intended to fall within the scope of the present invention.
Examples
As shown in fig. 1-7, a process for producing industrial byproduct gypsum comprises the following steps: the system comprises a feeding system, a drying and calcining system, a cooling system, a waste heat recycling system and a storage system. The specific operation is as follows:
the feeding system comprises the following components: the raw materials are industrial by-product gypsum, the material has certain humidity and follows viscidity, send into next process through loading belt 1, loading belt 1's discharge gate has connect picture peg airlock 2, picture peg airlock 2 has the effect of locking the wind, reduce the entering of the outer cold wind of system, in case it is great to leak wind, can exert an influence to the effect of material stoving, picture peg airlock 2 can effectively realize the unloading of wet sticky industrial by-product gypsum in addition, the putty does not.
The movable feeder 3 is connected behind the inserting plate air locking valve 2, the movable feeder 3 is of a full-sealing structure and is also used for locking air so as to reduce the entering of cold air outside the system, an air inducing port is arranged on the side surface, and hot air in the drying and calcining kiln 4 is sucked out by the air inducing port through countercurrent flow and enters a drying dust remover 5.
The return material of the drying dust remover 5 is dry powder and returns to the feeding belt 1 through a return material screw 16. The dry powder is mixed with the wet sticky material, so that the humidity and the stickiness of the material can be reduced, and the adhesion phenomenon of the material in equipment is well improved.
The drying system is as follows: the drying and calcining kiln 4 is used for drying the attached water and the crystal water of the industrial byproduct gypsum. A plurality of steam pipes are distributed in the drying and calcining kiln 4, the steam pipes are divided into three sections, the first section is a preheating section from the feeding end, the section is a light pipe, the wall of the section is thickened, the inner wall of the corresponding cylinder body is lined with a stainless steel plate, the stainless steel plate is corrosion-resistant and anti-sticking to form blocks, a vibrator is distributed on the outer wall of the cylinder body, and the material adhesion of the cylinder wall is prevented; the second section is a drying section, and an axial shovelling plate is welded on the drying section, so that the heat exchange area of the material is increased, and the material lifting and distributing function is realized, and the material is fully subjected to heat exchange with a heat source; the third section is a calcining section, and annular heat exchange fins are welded on the calcining section, so that the heat exchange area of the material is increased, and the material crystal water is calcined and dehydrated.
Steam in a steam pipe in the drying and calcining kiln 4 enters a steam pipe through a rotary joint 7, the steam is changed into condensed water after heat exchange and is discharged from the rotary joint 7, a discharge port of the drying and calcining kiln 4 is connected with an air locking discharger 8, the entering of cold air outside the system is reduced, the temperature of materials discharged from the drying and calcining kiln 4 is about 150 ℃, and the materials enter a cooling system from the air locking discharger 8 through a screw conveyor 19 and a lifter 110;
the cooling system is as follows: the air-cooled rotary cooler 11 is divided into a contact type cooling mode and a non-contact type cooling mode, the contact type cooling mode is that air in the air-cooled rotary cooler 11 directly exchanges heat with materials, and dust-containing gas after heat exchange is filtered and discharged by a dust remover; the non-contact cooling mode is that a heat exchange pipeline in the air-cooled rotary cooler 11 is in contact heat exchange with materials, and hot air in the pipeline is led to the air heater 15; the air-cooled rotary cooler 11 can reduce the temperature of the materials to be below 80 ℃, so that the materials discharged from the drying and calcining kiln 4 are prevented from entering the pre-grinding bin 20 for low-temperature calcination, the characteristics of the materials after the low-temperature calcination are unstable, and the waste rate is high.
The waste heat recycling system comprises the following components: high-temperature clean gas in a heat exchange tube of the air-cooled rotary cooler 11 is recycled by a cooling fan 14, enters a heater 15 and is continuously heated to more than 150 ℃, and then enters a drying and calcining kiln 4 to dry materials for recycling, so that the gas consumption is saved;
the air-cooled rotary cooler 11 has a dust-containing gas outlet connected to the cooling dust collector 12, and the returned material enters the lifter 218 through the return material screw 213 and enters the pre-grinding bin 20.
The discharge port of the air-cooled rotary cooler 11 is connected with a vibrating screen 16, and impurities, blocks and the like in the materials are further screened and purified. The discharge enters the elevator 218 through the screw conveyor 217 and enters the pre-mill bin 20.
The storage system is as follows: the pre-grinding bin 20 is divided into two bins, materials are divided into two pre-grinding bins 20 through the material dividing valve 19, the materials enter the two pre-grinding bins 20 respectively, the pre-grinding bin 20-1 is used for storing stable materials after the system operates stably due to unstable material characteristics of the system before initial operation and shutdown, and the pre-grinding bin 20-2 is used for storing head and tail materials; because the head and tail materials are unstable in characteristics, the head and tail materials are mixed with stable materials in a proper proportion through two metering scales 23-1 and 23-2, and the head and tail materials are fully utilized on the premise of ensuring the product quality;
gate valves 21-1 and 21-2, star-shaped ash discharge valves 22-1 and 22-2 and metering scales 23-1 and 23-2 are respectively connected below the two pre-grinding bins 20-1 and 20-2, and the arrangement of the double valves is convenient for maintenance and replacement, and can accurately control the amount of materials falling into the metering scales 23-1 and 23-2, so that the materials are prevented from impacting the metering scales 23-1 and 23-2 to influence the precision of the metering scales; the dust remover 24 for the pre-grinding bin collects dust in the pre-grinding bin 20 and falls into the pre-grinding bin 20; the structure of the modified mill 25 is divided into two forms: needle milling and ball milling. After the gypsum is subjected to modification grinding, the particle size distribution is more reasonable, the specific surface area is increased, the strength is greatly improved, and the volume weight is obviously reduced. Then the materials enter a screw conveyer 327 and a lifter 328 and finally enter a finished product bin 29, and the modified mill dust remover 26 collects dust and collects the dust into the screw conveyer 327.
The inserting plate type air locking valve 2 and the air locking discharger 8 have the air locking effect, the entering of cold air outside the system is reduced, once the air leakage is large, the effect of material drying is influenced, and the inserting plate air locking valve 2 can effectively realize the discharging of wet and sticky industrial byproduct gypsum without material blockage.
Claims (2)
1. A production process of industrial byproduct gypsum is characterized in that: the system comprises a feeding system, a drying and calcining system, a cooling system, a waste heat recycling system and a storage system; the method comprises the following specific steps:
the feeding system comprises the following components: the raw material is industrial byproduct gypsum, the material has certain humidity and viscosity, and is sent to the next procedure through a feeding belt (1), and a discharge hole of the feeding belt (1) is connected with a plug-in plate type air locking valve (2); a movable feeder (3) is connected behind the inserting plate type air locking valve (2), the movable feeder (3) is of a full-sealing structure, an air inducing port is formed in the side face of the movable feeder, and hot air in the drying and calcining kiln (4) is sucked out by the air inducing port through countercurrent flow and enters a drying dust remover (5); the return material of the drying dust remover (5) is dry powder, and returns to the feeding belt (1) through a return material screw (1) (6), and the dry powder is mixed with the wet and sticky material;
the drying and calcining system comprises the following components: the drying and calcining kiln (4) carries out dehydration treatment on the attached water and the crystal water of the industrial byproduct gypsum, a plurality of steam pipes are distributed in the drying and calcining kiln (4), the steam pipes are divided into three sections, the first section is a preheating section from a feeding end, the first section is a light pipe, the pipe wall of the section is thickened, the inner wall of the corresponding cylinder body is lined with a stainless steel plate, corrosion resistance and adhesion resistance are realized, the block is formed, the vibrator is distributed on the outer wall of the cylinder body, and the material adhesion of the cylinder wall is prevented; the second section is a drying section, and an axial shovelling plate is welded on the drying section, so that the heat exchange area of the material is increased, and the material lifting and distributing function is realized, and the material is fully subjected to heat exchange with a heat source; the third section is a calcining section which is welded with an annular heat exchange sheet, so that the heat exchange area of the material is increased, and the crystal water of the material is calcined and dehydrated;
steam in a steam pipe in the drying and calcining kiln (4) enters the steam pipe through a rotary joint (7), the steam is changed into condensed water after heat exchange and is discharged from the rotary joint (7), a discharge hole of the drying and calcining kiln (4) is connected with an air locking discharger (8), the entering of cold air outside the system is reduced, the temperature of materials discharged from the drying and calcining kiln (4) is 150 ℃, and the materials enter a cooling system from the air locking discharger (8) through a screw conveyor 1(9) and a lifter 1 (10);
the cooling system is as follows: the air-cooled rotary cooler (11) is divided into a contact type cooling mode and a non-contact type cooling mode, the contact type cooling mode is that air in the air-cooled rotary cooler (11) directly exchanges heat with materials, and dust-containing gas after heat exchange is filtered and discharged by a dust remover; the non-contact cooling mode is that a heat exchange pipeline in the air-cooled rotary cooler (11) is in contact heat exchange with materials, and hot air in the pipeline is led to the air heater (15); the air-cooled rotary cooler (11) can reduce the temperature of the materials to be below 80 ℃, so as to prevent the materials discharged from the drying and calcining kiln (4) from entering a pre-grinding bin (20) for low-temperature calcination;
the waste heat recycling system comprises the following components: high-temperature clean gas in a heat exchange tube of the air-cooled rotary cooler (11) is recycled by a cooling fan (14), enters a heater (15) and is continuously heated to more than 150 ℃, and then enters a drying and calcining kiln (4) to dry materials for recycling, so that the gas consumption is saved;
the air-cooled rotary cooler (11) is connected with a dust-containing gas outlet of a cooling dust remover (12), and returned materials enter a lifter 2(18) through a returned material spiral 2(13) and enter a pre-grinding bin (20);
a discharge port of the air-cooled rotary cooler (11) is connected with a vibrating screen (16) to further screen and purify impurities and blocks in the materials; the discharged material enters a lifter 2 and 18 through a screw conveyer 2 and 17 and enters a pre-grinding bin 20;
the storage system is as follows: the pre-grinding bin (20) is divided into two bins, materials are divided into two pre-grinding bins (20) through the material dividing valve (19), the materials enter the two pre-grinding bins (20) respectively, the pre-grinding bin (20-1) is used for storing stable materials after the system operates stably due to unstable material characteristics of the system before initial operation and shutdown, and the pre-grinding bin (20-2) is used for storing head and tail materials; because the head and tail materials have unstable characteristics, the head and tail materials are mixed with stable materials according to a proper proportion by two weighing scales (23-1 and 23-2), and the head and tail materials are fully utilized on the premise of ensuring the product quality;
gate valves (21-1, 21-2), star-shaped ash discharge valves (22-1, 22-2) and metering scales (23-1, 23-2) are respectively connected below the two pre-grinding bins (20-1, 20-2), the arrangement of the double valves is convenient to maintain and replace, and the double valves can accurately control the amount of materials falling into the metering scales (23-1, 23-2) and prevent the materials from impacting the metering scales (23-1, 23-2) to influence the precision of the metering scales;
the dust remover (24) of the pre-grinding bin collects dust of the pre-grinding bin (20) and falls into the pre-grinding bin (20);
the structure of the modified mill (25) is divided into two forms: needle milling and ball milling; after the gypsum is subjected to modification and grinding, the particle size distribution is more reasonable, the specific surface area is increased, the strength is greatly improved, and the volume weight is obviously reduced. Then the materials enter a screw conveyer 3(27), a lifting machine 3(28) and finally enter a finished product bin (29), and a modified grinding dust remover (26) collects dust and collects the dust into the screw conveyer 3 (27).
2. The process for producing industrial by-product gypsum according to claim 1, characterized in that: the inserting plate type air locking valve (2) and the air locking discharger (8) have an air locking effect, the entering of cold air outside the system is reduced, once the air leakage is large, the effect of drying materials is influenced, and the inserting plate air locking valve (2) can effectively realize the discharging of wet and sticky industrial byproduct gypsum without material blockage.
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| CN100434381C (en) * | 2006-09-20 | 2008-11-19 | 山东天力干燥设备有限公司 | Semi-hydrated gypsum calcination system and preparation process thereof |
| CN203333493U (en) * | 2013-06-06 | 2013-12-11 | 宁夏博得石膏科技有限公司 | Steam pipe type gypsum calcining kiln |
| CN103265191A (en) * | 2013-06-14 | 2013-08-28 | 盐城市诚信水泥机械制造有限公司 | One-step-method compound desulfured gypsum drying and calcining equipment |
| CN204240775U (en) * | 2014-10-29 | 2015-04-01 | 北京中矿环保科技股份有限公司 | Steam Heating fin tube type revolving drum drier |
| CN108709408A (en) * | 2018-06-29 | 2018-10-26 | 自贡市德明电站锅炉有限公司 | Aqueous gypsum drying and calcining device and technique |
| CN111678337A (en) * | 2020-06-30 | 2020-09-18 | 宁夏博得石膏研究院(有限公司) | Steam-air mixing heat exchange integrated gypsum one-step calcining device and process thereof |
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