CN215887082U - Manganese-rich slag production system capable of recycling dust - Google Patents
Manganese-rich slag production system capable of recycling dust Download PDFInfo
- Publication number
- CN215887082U CN215887082U CN202122458623.1U CN202122458623U CN215887082U CN 215887082 U CN215887082 U CN 215887082U CN 202122458623 U CN202122458623 U CN 202122458623U CN 215887082 U CN215887082 U CN 215887082U
- Authority
- CN
- China
- Prior art keywords
- tail gas
- dust
- tank
- manganese
- coal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The utility model discloses a manganese-rich slag production system capable of recycling dust, and belongs to the technical field of metallurgy. The system comprises a blast furnace, a tail gas treatment device, a dedusting ash treatment device and a blowing device. The furnace belly of the blast furnace is provided with a plurality of hot air pipes, and the furnace top is provided with a gas discharging pipe. The tail gas treatment device comprises a dust removal assembly connected with a coal gas discharge pipe. The dedusting ash treatment device comprises a dedusting ash collection tank, a washing tank, a filter press, a punching machine, a metering trough, a mixing tank, a ball mill and a powder collection tank which are sequentially arranged. The injection device comprises an injection tank connected with the powder collecting tank and a plurality of coal injection guns connected with the outlet end of the injection tank, and the coal injection guns are arranged in the hot blast pipe and used for injecting mixed powder into the blast furnace. The fly ash is sequentially washed, filter-pressed, tabletted and metered, and then is mixed and crushed with raw coal to form mixed powder, and the mixed powder is injected into the blast furnace, so that the fly ash is recycled, and the risk of the deterioration of the condition of the blast furnace caused by the enrichment of harmful components is reduced.
Description
Technical Field
The utility model belongs to the technical field of metallurgy, and particularly relates to a manganese-rich slag production system capable of recycling dust.
Background
The production of manganese-rich slag by blast furnace method is one of the main production modes of manganese-rich slag, and in the production process, a large amount of fly ash is produced, and the fly ash contains about 40% of carbon, about 30% of iron and a small amount of Al2O3And SiO2And also contains some harmful elements such as Na, K, Cl, Zn, Pb, etc. At present, the main purposes of the dust removal ash comprise sintering ore batching, building material batching and the like.
Because a blast furnace for producing the common manganese-rich slag is small, the amount of generated dust is limited, and the dust is high in utilization cost because the dust is stored and transported for a long distance when the dust is used as a building material ingredient. Moreover, when the fly ash is used as a sintering ore ingredient, harmful components are continuously enriched, which is not beneficial to the stability of the blast furnace road condition.
SUMMERY OF THE UTILITY MODEL
In view of the above, the utility model provides a manganese-rich slag production system capable of recycling fly ash, so as to solve the technical problem that harmful components are continuously enriched when fly ash is recycled in the prior art, which is not beneficial to the stability of the blast furnace road condition.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a manganese-rich slag production system capable of recycling dust comprises a blast furnace, a tail gas treatment device, a dust removal treatment device and a blowing device;
a plurality of hot air pipes are arranged at the furnace belly of the blast furnace, and a gas discharging pipe is arranged at the furnace top;
the tail gas treatment device comprises a dust removal assembly, the dust removal assembly is connected with the coal gas discharge pipe and is used for reducing the dust content in coal gas and generating dust;
the dedusting ash treatment device comprises a dedusting ash collection tank, a washing tank, a filter press, a punching machine, a metering material tank, a mixing tank, a ball mill and a powder collection tank which are arranged in sequence; the dedusting ash collecting tank is used for collecting dedusting ash generated by the dedusting assembly; a fresh water pipe is arranged on the washing tank and used for adding water into the dedusting ash to prepare a dedusting ash turbid liquid; the filter press is used for filter-pressing the dust-removing ash turbid liquid to generate a dust-removing ash filter cake and filtrate; the punching machine is used for punching the dedusting ash filter cake to a preset hardness to obtain a dedusting ash pressing sheet; the metering hopper is used for conveying dust removal pressing sheets; the mixing tank is used for mixing the dust removal pressed sheets with raw coal to obtain a mixture; the ball mill is used for crushing the mixture to prepare mixed powder; the powder collecting tank is used for collecting mixed powder;
the injection device comprises an injection tank connected with the powder collecting tank and a plurality of coal injection guns connected with the outlet end of the injection tank, and the coal injection guns are arranged in the hot blast pipe and used for injecting mixed powder into the blast furnace.
As a further description of the above technical solution: and the filtrate discharge end of the filter press is connected with the feed end of the water washing tank.
As a further description of the above technical solution: the tail gas treatment device further comprises a waste heat boiler, the feed end of the waste heat boiler is connected with the coal gas discharge pipe, and the discharge end of the waste heat boiler is connected with the dust removal assembly.
As a further description of the above technical solution: the tail gas treatment device also comprises a hot blast stove, and a fuel gas feed end of the hot blast stove is connected with a tail gas discharge end of the dust removal assembly; and the tail gas discharge end of the hot blast stove is connected with the ball mill.
As a further description of the above technical solution: the gas phase discharge end of the powder collecting tank is connected with a tail gas dust remover, and the dedusting ash discharge end of the tail gas dust remover is connected with the dedusting ash collecting tank.
As a further description of the above technical solution: and a gas phase outlet end of the tail gas dust remover is provided with a tail gas discharge pipe and a tail gas circulating pipe, the tail gas discharge pipe is emptied, and the tail gas circulating pipe is connected with the ball mill.
As a further description of the above technical solution: the tail gas discharge end of the hot blast stove is provided with a high-temperature tail gas regulating valve, and the tail gas circulating pipe is provided with a low-temperature tail gas regulating valve.
As a further description of the above technical solution: the tail gas discharge pipe is connected with a tail gas desulfurization tower.
As a further description of the above technical solution: the dust removal component comprises a gravity dust remover and a bag-type dust remover which are connected in sequence.
As a further description of the above technical solution: the manganese-rich slag production system capable of recycling the dust removal ash further comprises a raw coal conveying device, and the raw coal conveying device comprises a bituminous coal metering trough and an anthracite coal metering trough.
The utility model has the following beneficial effects: and arranging a dedusting ash treatment device, wherein dedusting ash generated in the production process of the manganese-rich slag is firstly added with water and pulped in the water washing tank to form a dedusting ash turbid liquid. And sending the dust removal ash turbid liquid into the filter press, and performing filter pressing to obtain a dust removal ash filter cake and filtrate, so that the content of water-soluble harmful substances in the dust removal ash is reduced. And stamping the fly ash filter cake, mixing the filter cake with raw coal, crushing and drying to form mixed powder. The mixed powder passes through the jetting device is followed hot-blast main jetting gets into in the blast furnace, improve through the coal injection method on the one hand the stove internal environment of blast furnace improves blast furnace operating mode, reduces the coke quantity, reduction in production cost, and on the other hand, recycle the fly ash, reduce the carbon loss, further reduce cost. In the recycling process of the dedusting ash, water-soluble harmful substances are partially removed through washing, so that the risk of the deterioration of the blast furnace condition caused by the enrichment of harmful components is reduced.
Drawings
FIG. 1 is a schematic equipment flow diagram of a manganese-rich slag production system capable of recycling dust.
In the figure: the manganese-rich slag production system 10 capable of recycling the fly ash comprises a blast furnace 100, a hot air pipe 110, a coal gas discharging pipe 120, a dust removal component 210, a waste heat boiler 220, a hot air furnace 230, a high-temperature tail gas regulating valve 231, a fly ash collecting tank 310, a water washing tank 320, a fresh water pipe 321, a filter press 330, a punch press 340, a metering trough 350, a mixing tank 360, a ball mill 370, a powder collecting tank 380, a tail gas dust remover 390, a tail gas discharging pipe 391, a tail gas circulating pipe 392, a low-temperature tail gas regulating valve 393, a tail gas desulfurization tower 394, an injection tank 410, a coal injection gun 420, a bituminous coal metering trough 510 and an anthracite metering trough 520.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Referring to fig. 1, a manganese-rich slag production system 10 capable of recycling fly ash provided in an embodiment of the present invention includes a blast furnace 100, a tail gas treatment device, a fly ash treatment device, and a blowing device. The blast furnace 100 is provided with a plurality of hot air pipes 110 at the furnace belly and a gas outlet pipe 120 at the furnace top. The tail gas treatment device comprises a dust removal assembly 210, wherein the dust removal assembly 210 is connected with the coal gas discharge pipe 120 and is used for reducing the dust content in coal gas and generating dust removal ash.
The fly ash treatment device comprises a fly ash collecting tank 310, a water washing tank 320, a filter press 330, a punching machine 340, a metering trough 350, a mixing tank 360, a ball mill 370 and a powder collecting tank 380 which are arranged in sequence. The fly ash collection tank 310 is used for collecting fly ash generated by the dust collection assembly 210. And the water washing tank 320 is provided with a fresh water pipe 321 for adding water into the dedusting ash to prepare a dedusting ash turbid liquid. The filter press 330 is used for filter-pressing the dust-removing ash turbid liquid to generate a dust-removing ash filter cake and filtrate. The punch 340 is used for punching the fly ash filter cake to a predetermined hardness to obtain a fly ash tablet. The metering chute 350 is used for conveying dust removal tablets. The mixing tank 360 is used for mixing the dust removal tabletting and the raw coal to obtain a mixture. The ball mill 370 is used to pulverize the mixture to prepare a mixed powder. The powder collection tank 380 is used for collecting mixed powder.
The blowing device comprises a blowing tank 410 connected to the powder collecting tank 380 and a plurality of coal injection guns 420 connected to the outlet end of the blowing tank 410, wherein the coal injection guns 420 are arranged in the hot blast pipe 110 and are used for blowing mixed powder into the blast furnace 100.
In this embodiment, in the process of smelting the manganese-rich slag, the coal gas produced in the blast furnace 100 is discharged through the coal gas discharging pipe 120, and is first separated by the dust removing assembly 210 to obtain clean coal gas and dust. Wherein, the clean gas is recycled, and the fly ash is firstly collected in the fly ash collecting tank 310. When the fly ash in the fly ash collecting tank 310 accumulates to a certain material level, the fly ash is transported to in the water washing tank 320, pure water or deionized water is added, and stirring is carried out to form the fly ash turbid liquid to carry out water washing to the fly ash, make wherein water-soluble harmful substance, dissolve in aquatic such as Na, K, Cl. The dust removal ash turbid liquid is sent into the filter press 330 through a pump and other facilities, filter pressing is carried out, a dust removal ash filter cake and filtrate are obtained, at the moment, the content of water-soluble harmful substances such as Na, K, Cl and the like in the dust removal ash filter cake is greatly reduced, C, SiO2Etc. are enriched. The fly ash filter cake is transferred to the punch 340 for punching to form a fly ash tablet with certain hardness for further crushing to obtain a mixed powder with a granularity meeting the process requirement. And (3) after the fly ash tablets are measured by the measuring trough 350, the fly ash tablets are sent into the mixing tank 360 to be mixed with raw coal (wherein the content of the raw coal is more than or equal to 97 percent) to form a mixture. The mixture is fed into the ball mill 370 for milling to obtain a powder mixture having a particle size meeting the process requirements. The mixed powder passes through the blowing tank410 and the coal injection lance 420 are injected into the blast furnace 100 from the hot blast pipe 110. On the one hand, the in-furnace environment of the blast furnace is improved through a coal injection method, the operation condition of the blast furnace is improved, the coke consumption is reduced, the production cost is reduced, and on the other hand, the fly ash is recycled, the carbon loss is reduced, and the cost is further reduced. In the recycling process of the dedusting ash, water-soluble harmful substances are partially removed through washing, so that the risk of worsening the condition of the blast furnace 100 caused by the enrichment of harmful components is reduced.
It should be noted that in the above embodiment, the filter press 330 may be replaced by a suction filtration device, and the ball mill 370 may be replaced by other types of milling devices.
Further, the filtrate discharge end of the filter press 330 is connected to the feed end of the water washing tank 320 to recycle the filtrate of the filter press, so that on one hand, the loss of C in the filtrate is reduced, and on the other hand, the wastewater yield is reduced.
In an embodiment, the tail gas treatment device further includes a waste heat boiler 220, a feed end of the waste heat boiler 220 is connected to the gas outlet pipe 120, and a discharge end of the waste heat boiler 220 is connected to the dust removal assembly 210. The high-temperature gas extracted from the top of the blast furnace 100 first passes through the exhaust heat boiler 220, and the energy therein is recovered, thereby reducing the heat loss. In this embodiment, the boiler ash generated in the exhaust heat boiler 220 is transferred to the fly ash collection tank 310 for recycling.
Further, the tail gas treatment device further comprises a hot blast stove 230, and a fuel gas feeding end of the hot blast stove 230 is connected with a tail gas discharging end of the dust removal assembly 210. The tail gas discharge end of the hot blast stove 230 is connected with the ball mill 370. The gas extracted from the top of the blast furnace 100 is dedusted by the dedusting component 210, and the obtained clean gas is used as the fuel gas of the hot blast stove 230, and the hot blast stove is used for heating the air fed into the blast furnace 100 to a predetermined process temperature and is introduced into the blast furnace 100 through the hot blast pipe 110 to maintain the basic oxygen requirement in the blast furnace 100. In the hot blast stove 230, high-temperature tail gas generated by burning clean gas is introduced into the ball mill 370, and a mixture formed by raw coal and dust removal pressing sheets is dried, so that heat can be further recycled, and heat loss is reduced.
Further, the gas phase discharge end of the powder collecting tank 380 is connected with a tail gas dust collector 390, and the dust removal discharge end of the tail gas dust collector 390 is connected with the dust removal collecting tank 310. The tail gas dust remover 390 is used for reducing the dust content in the tail gas, and the dust removed dust generated in the tail gas dust remover 390 is collected in the dust removed dust collecting tank 310 for further recycling.
Furthermore, a tail gas discharge pipe 391 and a tail gas circulation pipe 392 are arranged at the gas phase outlet end of the tail gas dust remover 390, the tail gas discharge pipe 391 is emptied, and the tail gas circulation pipe 392 is connected with the ball mill 370. And mixing part of the low-temperature tail gas and the high-temperature tail gas, and introducing the mixture into the ball mill 370 to adjust the temperature of the gas sent into the ball mill 370, so as to prevent the over-high temperature and potential safety hazard.
Further, a high-temperature tail gas regulating valve 231 is arranged at a tail gas discharging end of the hot blast stove 230, a low-temperature tail gas regulating valve 393 is arranged on the tail gas circulating pipe 392, and the temperature of the gas fed into the ball mill 370 is regulated by regulating the opening degrees of the high-temperature tail gas regulating valve 231 and the low-temperature tail gas regulating valve 393.
In one embodiment, the tail gas discharge pipe 391 is connected to a tail gas desulfurization tower 394 to reduce the content of acid gases in the tail gas and ensure that the tail gas reaches the standard.
In an embodiment, the dust removing assembly 210 includes a gravity dust remover and a bag-type dust remover connected in sequence, so as to improve the dust removing effect of the coal gas.
In another embodiment, the manganese-rich slag production system 10 capable of recycling fly ash further includes a raw coal conveying device, which includes a bituminous coal measuring trough 510 and an anthracite coal measuring trough 520, and the bituminous coal and the anthracite coal are respectively conveyed into the mixing tank 360 through the bituminous coal measuring trough 510 and the anthracite coal measuring trough 520, so that the powder obtained by the ball mill 370 has both bituminous coal components and anthracite coal components. The bituminous coal has higher volatile components, loose structure, porous combustion process, better combustion performance than anthracite, but lower replacement ratio. The anthracite has high carbon content and compact structure, the combustion process is a laminar combustion process from outside to inside, the combustion rate is lower, but the replacement ratio is higher than that of bituminous coal. Therefore, the soft coal and the anthracite are mixed and injected into the blast furnace 100, so that the combustion can be mutually promoted, and the coal coke replacement ratio of the blast furnace is improved. In addition, the reasonable coal blending greatly reduces the explosiveness of the mixed coal powder, improves the combustion performance, reduces the unburned coal powder and is beneficial to the smooth operation of the blast furnace.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the utility model.
Claims (10)
1. A manganese-rich slag production system capable of recycling dust comprises a blast furnace, and is characterized by further comprising a tail gas treatment device, a dust removal treatment device and a blowing device;
a plurality of hot air pipes are arranged at the furnace belly of the blast furnace, and a gas discharging pipe is arranged at the furnace top;
the tail gas treatment device comprises a dust removal assembly, the dust removal assembly is connected with the coal gas discharge pipe and is used for reducing the dust content in coal gas and generating dust;
the dedusting ash treatment device comprises a dedusting ash collection tank, a washing tank, a filter press, a punching machine, a metering material tank, a mixing tank, a ball mill and a powder collection tank which are arranged in sequence; the dedusting ash collecting tank is used for collecting dedusting ash generated by the dedusting assembly; a fresh water pipe is arranged on the washing tank and used for adding water into the dedusting ash to prepare a dedusting ash turbid liquid; the filter press is used for filter-pressing the dust-removing ash turbid liquid to generate a dust-removing ash filter cake and filtrate; the punching machine is used for punching the dedusting ash filter cake to a preset hardness to obtain a dedusting ash pressing sheet; the metering hopper is used for conveying dust removal pressing sheets; the mixing tank is used for mixing the dust removal pressed sheets with raw coal to obtain a mixture; the ball mill is used for crushing the mixture to prepare mixed powder; the powder collecting tank is used for collecting mixed powder;
the injection device comprises an injection tank connected with the powder collecting tank and a plurality of coal injection guns connected with the outlet end of the injection tank, and the coal injection guns are arranged in the hot blast pipe and used for injecting mixed powder into the blast furnace.
2. The manganese-rich slag production system capable of recycling precipitator dust according to claim 1, wherein a filtrate discharge end of the filter press is connected with a feed end of the water washing tank.
3. The manganese-rich slag production system capable of recycling fly ash according to claim 1, wherein said tail gas treatment device further comprises a waste heat boiler, a feed end of said waste heat boiler is connected to said gas discharge pipe, and a discharge end of said waste heat boiler is connected to said dust removal assembly.
4. The manganese-rich slag production system capable of recycling precipitator dust according to claim 3, wherein the tail gas treatment device further comprises a hot blast stove, and a fuel gas feed end of the hot blast stove is connected with a tail gas discharge end of the dust removal assembly; and the tail gas discharge end of the hot blast stove is connected with the ball mill.
5. The manganese-rich slag production system capable of recycling fly ash according to claim 4, wherein a gas phase discharge end of the powder collection tank is connected with a tail gas dust collector, and a fly ash discharge end of the tail gas dust collector is connected with the fly ash collection tank.
6. The manganese-rich slag production system capable of recycling fly ash according to claim 5, wherein a tail gas discharge pipe and a tail gas circulation pipe are arranged at the gas phase outlet end of the tail gas dust remover, the tail gas discharge pipe is emptied, and the tail gas circulation pipe is connected with the ball mill.
7. The manganese-rich slag production system capable of recycling fly ash according to claim 6, wherein a high temperature tail gas regulating valve is disposed at a tail gas discharge end of the hot blast stove, and a low temperature tail gas regulating valve is disposed on the tail gas circulating pipe.
8. The manganese-rich slag production system capable of recycling fly ash according to claim 6, wherein said tail gas discharge pipe is connected to a tail gas desulfurization tower.
9. The manganese-rich slag production system capable of recycling precipitator dust according to claim 1, wherein the dust collection assembly comprises a gravity dust collector and a bag-type dust collector which are connected in sequence.
10. The manganese-rich slag production system capable of recycling fly ash of claim 1, further comprising a raw coal conveying device, wherein said raw coal conveying device comprises a bituminous coal metering chute and an anthracite coal metering chute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122458623.1U CN215887082U (en) | 2021-10-12 | 2021-10-12 | Manganese-rich slag production system capable of recycling dust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122458623.1U CN215887082U (en) | 2021-10-12 | 2021-10-12 | Manganese-rich slag production system capable of recycling dust |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215887082U true CN215887082U (en) | 2022-02-22 |
Family
ID=80250202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122458623.1U Active CN215887082U (en) | 2021-10-12 | 2021-10-12 | Manganese-rich slag production system capable of recycling dust |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215887082U (en) |
-
2021
- 2021-10-12 CN CN202122458623.1U patent/CN215887082U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108380360B (en) | Production process of steel slag and iron fine powder | |
| CN109423558A (en) | A kind of technique of municipal administration and metallurgical difficult solid waste collaboration resource utilization | |
| CN103344114B (en) | A kind of novel energy-saving emission-reducing sintering machine system and sintering method | |
| CN1891841B (en) | Regenerative lead processing method and apparatus | |
| CN106113246B (en) | A kind of device and operation method of medical refuse burning flyash microwave continuous sintering ceramsite | |
| CN111270077A (en) | System and method for treating dust collection ash of steel plant by chain plate type high-temperature reduction furnace | |
| CN109680156A (en) | A kind of waste incineration and generating electricity cinder resourceization utilizes system and method | |
| CN105800968A (en) | Device and method for quicklime digestion, dedusting and sewage sludge treatment | |
| CN108502884A (en) | A method of producing the grey mix and convert calcium lime powder pressure ball molding of calcium carbide furnace of calcium carbide purification | |
| CN107504492B (en) | Industrial sludge, waste emulsion residue and metallurgical ash combined treatment system and power generation process thereof | |
| CN206997328U (en) | A kind of aluminium electroloysis waste cathode carbon block harmless treatment and recovery system | |
| CN213726549U (en) | Recovery and reproduction device for active coke desulfurization and denitrification crushed coke | |
| CN215887082U (en) | Manganese-rich slag production system capable of recycling dust | |
| CN111747727A (en) | Copper-nickel-containing solid hazardous waste sintering system and sintering process | |
| CN217579030U (en) | System for treating oil-containing muddy water of rolled steel by rotary hearth furnace | |
| CN110343878A (en) | A kind of energy-saving and environment-friendly dilval production method | |
| CN108977250A (en) | A kind of waste tire of automobile and agricultural stalk fuel combination processing unit and method | |
| CN207592409U (en) | A kind of system of municipal administration and metallurgical difficult solid waste collaboration recycling | |
| CN205997147U (en) | A kind of device of medical refuse burning flyash microwave continuous sintering ceramsite | |
| CN112624637B (en) | High-activity steel slag micro powder preparation system | |
| CN208791588U (en) | A kind of waste tire of automobile and agricultural stalk fuel combination processing unit | |
| CN212451336U (en) | System for utilize flue gas tail gas preparation buggy | |
| CN204356237U (en) | With the quality coal in cement kiln systems of grate-cooler disposing sludge | |
| CN102863137B (en) | Comprehensive utilization method and comprehensive utilization system for biochemical sludge | |
| CN113181758A (en) | Gypsum wet flue gas desulfurization method and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |