CN221063897U - Electrolytic aluminum dangerous waste overhaul slag fluorine-fixing and cyanide-removing treatment system - Google Patents
Electrolytic aluminum dangerous waste overhaul slag fluorine-fixing and cyanide-removing treatment system Download PDFInfo
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- CN221063897U CN221063897U CN202322783196.3U CN202322783196U CN221063897U CN 221063897 U CN221063897 U CN 221063897U CN 202322783196 U CN202322783196 U CN 202322783196U CN 221063897 U CN221063897 U CN 221063897U
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- cyanide
- fixing
- fluorine
- overhaul slag
- treatment system
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- 239000002893 slag Substances 0.000 title claims abstract description 45
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 25
- 239000002699 waste material Substances 0.000 title claims description 6
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000007788 liquid Substances 0.000 claims abstract description 32
- 238000000926 separation method Methods 0.000 claims abstract description 23
- 239000002920 hazardous waste Substances 0.000 claims abstract description 15
- 239000007787 solid Substances 0.000 claims abstract description 13
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 10
- 229910052731 fluorine Inorganic materials 0.000 claims description 10
- 239000011737 fluorine Substances 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000002101 nanobubble Substances 0.000 claims description 6
- 230000006378 damage Effects 0.000 claims description 4
- 239000003814 drug Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 239000000706 filtrate Substances 0.000 claims description 3
- 239000012066 reaction slurry Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- CPPKAGUPTKIMNP-UHFFFAOYSA-N cyanogen fluoride Chemical compound FC#N CPPKAGUPTKIMNP-UHFFFAOYSA-N 0.000 abstract description 2
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 description 8
- 239000000243 solution Substances 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 239000002002 slurry Substances 0.000 description 5
- CAVCGVPGBKGDTG-UHFFFAOYSA-N alumanylidynemethyl(alumanylidynemethylalumanylidenemethylidene)alumane Chemical compound [Al]#C[Al]=C=[Al]C#[Al] CAVCGVPGBKGDTG-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000012065 filter cake Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 239000010406 cathode material Substances 0.000 description 2
- 238000006115 defluorination reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 150000004673 fluoride salts Chemical class 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 150000002825 nitriles Chemical class 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000002341 toxic gas Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 206010038731 Respiratory tract irritation Diseases 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The utility model provides a fluorine-fixing and cyanide-removing treatment system for electrolytic aluminum hazardous waste overhaul slag, which comprises the following steps: the crushing unit, the solid fluorine cyanide removal unit and the solid-liquid separation unit are sequentially connected in series through a conveying pipeline to form an integrated production line. The utility model can effectively shorten the treatment time of the overhaul slag and improve the treatment efficiency. The cyanide removal treatment by adopting ozone is environment-friendly and efficient, so that the utilization rate of the ozone is improved, and the treatment cost is reduced. The electrolytic aluminum hazardous waste overhaul slag fluorine-fixing and cyanide-removing treatment system realizes the resource utilization of beneficial substances in the overhaul slag and has better social and economic benefits.
Description
Technical Field
The utility model relates to the technical field of solid waste treatment in the electrolytic aluminum production process, in particular to a system for treating waste overhaul slag, fluorine and cyanide of electrolytic aluminum.
Background
The overhaul slag is that the cathode material of the electrolytic tank is directly contacted with electrolyte and aluminum liquid with corrosiveness at the temperature of more than 950 ℃ in the production process of electrolytic aluminum, and after the aluminum electrolytic tank is operated for a period of time, the electrolytic tank is continuously eroded and permeated along with the electrolyte and the aluminum liquid, and the electrolytic tank is usually required to be subjected to 1-time tank-stopping overhaul every 5-6 years, and the waste cathode material and the refractory heat-insulating material are replaced. Wherein the carbon solid waste (carbon material) accounts for about 50 percent, and the main components of the carbon material comprise cathode carbon blocks, fluoride salt, aluminum carbide and aluminum alloy; the aluminum-silicon solid waste (refractory heat-insulating material) accounts for about 40 percent, and the main components of the aluminum-silicon solid waste are aluminum oxide, silicon oxide, calcium oxide, fluoride salt and the like; in addition, about 0.2% cyanide salts are present.
Currently, the wet treatment of the overhaul slag is to directly place the overhaul slag into an aqueous solution and add a cyanogen and fluorine removing agent for treatment. However, this approach strongly reacts the components of the overhaul slag, such as aluminum nitride, aluminum carbide, cyanide salts, etc., with water, releasing a large amount of toxic gases, such as hydrogen cyanide, ammonia and methane.
In particular, hydrogen cyanide is a highly toxic gas and even a trace intake can lead to death of personnel; ammonia causes respiratory tract irritation injury; methane is extremely easy to burn and explode, and safety accidents can occur. The unorganized emission of these gases has exceeded environmental pollution approval standards, posing a serious threat to the quality of the air. In addition to direct health and safety hazards, these gas emissions also increase the environmental management pressures of the enterprise. The collection and treatment system must be added to invest more funds and energy for treatment. Therefore, in order to solve the problems, a fluorine-fixing and cyanide-removing treatment system for electrolytic aluminum hazardous waste overhaul slag is provided.
Disclosure of utility model
The utility model provides a fluorine-fixing and cyanide-removing treatment system for electrolytic aluminum hazardous waste overhaul slag, which aims to solve the problems.
An electrolytic aluminum hazardous waste overhaul slag fluorine-fixing and cyanide-removing treatment system, comprising: the crushing unit, the solid fluorine cyanide removal unit and the solid-liquid separation unit are sequentially connected in series through a conveying pipeline to form an integrated production line;
Unlike the wet treatment mode in the prior art, the fluorine fixing and cyanide removing unit comprises: the roasting furnace is connected with the crushing unit, the roasting furnace is connected with the ball mill, the ball mill is connected with the buffer tank, the buffer tank is connected with the ozone generator, and the ozone generator is connected with the solid-liquid separation unit. Wherein, the ball mill is connected with a medicament box, and the ozone generator is connected with an ozone storage tank. In the application, the crushed overhaul slag is roasted firstly to oxidize and decompose cyanide, aluminum nitride and aluminum carbide, thereby effectively avoiding the reaction and precipitation of harmful or dangerous gases such as HCN, NH3, CH4 and the like when the overhaul slag contacts water and effectively playing a role in fixing nitrogen. And secondly, performing defluorination and cyanogen removal operations in a ball mill and an ozone generator respectively, so as to achieve the purpose of high-efficiency defluorination and cyanogen removal. And finally, carrying out solid-liquid separation on the slurry with complete reaction.
As a preferred technical solution of the crushing unit according to the application, the crushing unit is one of a jaw crusher, a high-pressure roller mill, a hammer crusher or a counter-impact crusher or a combination thereof.
In order to judge whether the overhaul slag from the ball mill reaches the optimal size fraction, a cyclone for classifying the reaction slurry is arranged between the ball mill and the buffer tank. Returning unqualified materials of the overhaul slag particle grade to the mill again to continue grinding, and enabling the qualified materials of the overhaul slag particle grade to enter the next working procedure.
In order to ensure that ozone can stay in the solution for a long time to react with dangerous hydrogen cyanide ions in the leaching solution, the ozone generator is a micro-nano bubble generator, and an ozone destruction device is arranged in the micro-nano bubble generator, so that redundant ozone can be recovered.
As a preferable technical scheme of the solid-liquid separation unit, the solid-liquid separation unit comprises a filter press connected with an ozone generator for solid-liquid separation, wherein the lower part of the filter press is connected with a reservoir through a water pipe, and the reservoir is connected with a ball mill through a circulating water pipe and is used for providing needed water for the ball mill; the other end of the filter press is connected with a solid treatment device.
The technical scheme is as follows: the filter press carries out solid-liquid separation on the slurry, the separated solid enters the solid treatment device through the discharge port, and the separated liquid enters the reservoir through the water pipe for subsequent use, so that the required water is provided for the ball mill.
In order to prevent any solid impurities from being doped in the water recycled in the reservoir, a filter for filtering filtrate is arranged between the filter press and the reservoir.
In order to provide power for water circulation, water is lifted to a high place, so that the water can circulate in the system according to the designed flow, and a circulating pump is arranged on the circulating water pipe.
The utility model has the technical effects that:
According to the utility model, firstly, a roasting method is adopted, so that cyanide, aluminum nitride and aluminum carbide are oxidized and decomposed, and harmful or dangerous gases such as HCN, NH 3、CH4 and the like can be effectively prevented from being separated out by reaction when overhaul slag contacts water; secondly, adding water and a fluorine fixing agent into the ball mill to carry out fluorine fixing reaction, so as to achieve the effect of high-efficiency fluorine fixing in a short time; and then the ozone generator uses the strong oxidizing property of ozone to oxidize organic substances into harmless substances, thereby achieving the aim of removing cyanogen. Finally, the slurry is subjected to solid-liquid separation by utilizing a filter press, and the water is recycled.
The application can effectively shorten the treatment time of the overhaul slag and improve the treatment efficiency. The cyanide removal treatment by adopting ozone is environment-friendly and efficient, so that the utilization rate of the ozone is improved, and the treatment cost is reduced. The electrolytic aluminum hazardous waste overhaul slag fluorine-fixing and cyanide-removing treatment system realizes the resource utilization of beneficial substances in the overhaul slag and has better social and economic benefits.
Drawings
FIG. 1 is a schematic diagram of an electrolytic aluminum hazardous waste overhaul slag fluorine-fixing and cyanide-removing treatment system in the utility model;
In the figure, the crushing unit 1, the fluorine-fixing and cyanide-removing unit 2, the solid-liquid separation unit 3, the roasting furnace 20, the ball mill 21, the buffer tank 22, the ozone generator 23, the medicament box 24, the ozone storage tank 25, the cyclone 26, the filter press 30, the filter press 31, the water storage tank 32, the circulating water pipe 33, the filter 34 and the circulating pump.
Detailed Description
An embodiment of the present utility model will be specifically described with reference to fig. 1.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an electrolytic aluminum hazardous waste overhaul slag fluorine-fixing and cyanide-removing treatment system according to some embodiments of the present application, where the electrolytic aluminum hazardous waste overhaul slag fluorine-fixing and cyanide-removing treatment system includes: the device comprises a crushing unit 1, a fluorine-fixing and cyanide-removing unit 2 and a solid-liquid separation unit 3, wherein the crushing unit 1, the fluorine-fixing and cyanide-removing unit 2 and the solid-liquid separation unit 3 are sequentially connected in series through a conveying pipeline to form an integrated production line;
The fluorine fixing and cyanide removing unit 2 comprises: a roasting furnace 20 connected with the crushing unit 1, wherein the roasting furnace 20 is connected with a ball mill 21, the ball mill 21 is connected with a buffer tank 22, the buffer tank 22 is connected with an ozone generator 23, and the ozone generator 23 is connected with the solid-liquid separation unit 3;
Wherein, the ball mill 21 is connected with a medicament box 24, and the ozone generator 23 is connected with an ozone storage tank 25.
The specific operation process of the electrolytic aluminum dangerous waste overhaul slag fluorine-fixing and cyanide-removing treatment system in the embodiment is as follows: firstly, the overhaul slag is sent into a crushing unit 1 for preliminary crushing treatment, so that the requirement of a subsequent treatment process is met. The crushed and qualified overhaul slag is conveyed into a roasting furnace 20 for roasting. Through high-temperature roasting, the content of harmful substances in the overhaul slag can be further reduced, and the utilization value of the overhaul slag is improved. The overhaul slag after the roasting is sent into the ball mill 21 through a transmission pipeline. Meanwhile, the fluorine fixing agent in the agent box 24 and the water in the water reservoir 31 are added into the ball mill 21 for mixed grinding so as to realize high-efficiency fluorine fixing. The process mainly converts organic substances in the overhaul slag into harmless substances through chemical reaction, thereby achieving the effect of environmental protection.
The ground pulp is transferred to cyclone 26 for classification. In the process, the materials with unqualified overhaul slag particle level can return to the mill again to continue grinding, so as to meet the requirements of the subsequent treatment process. And the qualified materials of the overhaul slag particle grade enter the buffer tank 22 to be diluted and stirred by clean water for subsequent treatment.
The diluted ore pulp is poured into a high-grade oxidation reaction container of a micro-nano ozone generator, then the ozone generator 23 is started, and ozone is introduced into the overhaul slag ore pulp. The organic substances are oxidized into harmless substances through the strong oxidizing property of ozone, so that the aim of removing cyanide is fulfilled.
Finally, the slurry after the reaction is transferred to the filter press 30 for solid-liquid separation. In the process, the separated solid particles form a filter cake on the filter cloth, and the filter cake is discharged from a discharge hole and enters a solid treatment device in the next step. The liquid obtained by filtration enters the reservoir through the water pipe for reuse.
In some embodiments of the application, the crushing unit 1 is one of a jaw crusher, a high pressure roll mill, a hammer crusher or a counter-impact crusher, or a combination thereof.
In some embodiments of the present application, in order that ozone can stay in the solution for a long time to react with dangerous cyanide ions in the leaching solution, the ozone generator 23 is a micro-nano bubble generator, and an ozone destruction device is installed in the micro-nano bubble generator, so that redundant ozone can be recovered.
In some embodiments of the present application, in order to determine whether the overhaul slag discharged from the ball mill reaches an optimal size fraction, a cyclone 26 for classifying the reaction slurry is provided between the ball mill 21 and the buffer tank 22.
On the basis of the above embodiment, as a preferred specific embodiment of the solid-liquid separation unit, the solid-liquid separation unit 3 comprises a filter press 30 connected with an ozone generator 23 for solid-liquid separation, the lower part of the filter press 30 is connected with a reservoir 31 through a water pipe, and the reservoir 31 is connected with a ball mill 21 through a circulating water pipe 32 for providing required water in the ball mill; the other end of the filter press 30 is connected to a solids processing apparatus.
A filter 33 for filtering the filtrate is provided between the filter press 30 and the reservoir 31.
The circulating water pipe 32 is provided with a circulating pump 34.
Specifically, in this type of embodiment, the slurry in the ozone generator 23 is first transferred by a slag pump to the filter press 30 for solid-liquid separation. The solid content is increased by the filter cloth in the filter press 30, the solid particles form a filter cake on the filter cloth, and the filter cake is discharged from the discharge port and enters the solid treatment device of the next step. The filtered liquid is introduced into the filter 33 through a water pipe, and subjected to a deep purification treatment to remove various free impurities. The filtered liquid flows into the reservoir 31, and the circulation pump 34 is controlled to pump a certain amount of liquid from the reservoir 31 according to the water demand of the ball mill 21. The circulating liquid is supplied to the ball mill 21 again for use, thereby realizing the recycling of the liquid and reducing the water consumption.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the technical solutions according to the embodiments of the present utility model.
Claims (7)
1. Electrolytic aluminum hazardous waste overhaul slag fluorine-fixing and cyanide-removing treatment system is characterized by comprising: the device comprises a crushing unit (1), a fluorine-fixing and cyanide-removing unit (2) and a solid-liquid separation unit (3), wherein the crushing unit (1), the fluorine-fixing and cyanide-removing unit (2) and the solid-liquid separation unit (3) are sequentially connected in series through a conveying pipeline to form an integrated production line;
The fluorine fixing and cyanide removing unit (2) comprises: a roasting furnace (20) connected with the crushing unit (1), wherein the roasting furnace (20) is connected with a ball mill (21), the ball mill (21) is connected with a buffer tank (22), the buffer tank (22) is connected with an ozone generator (23), and the ozone generator (23) is connected with a solid-liquid separation unit (3);
Wherein, ball mill (21) connect medicament case (24), ozone generator (23) connect ozone holding vessel (25).
2. The electrolytic aluminum hazardous waste overhaul slag fluorine-fixing and cyanide-removing treatment system according to claim 1, wherein the crushing unit (1) is one or a combination of a jaw crusher, a high-pressure roller mill, a hammer crusher and a reaction crusher.
3. The electrolytic aluminum hazardous waste overhaul slag fluorine-fixing and cyanide-removing treatment system according to claim 1, wherein a cyclone (26) for classifying reaction slurry is arranged between the ball mill (21) and the buffer tank (22).
4. The electrolytic aluminum dangerous waste overhaul slag fluorine-fixing and cyanide-removing treatment system according to claim 1, wherein the ozone generator (23) is a micro-nano bubble generator, and an ozone destruction device is arranged in the micro-nano bubble generator and can recycle redundant ozone.
5. The electrolytic aluminum hazardous waste overhaul slag fluorine-fixing and cyanide-removing treatment system according to claim 1, wherein the solid-liquid separation unit (3) comprises a filter press (30) connected with an ozone generator (23) for solid-liquid separation, the lower part of the filter press (30) is connected with a reservoir (31) through a water pipe, and the reservoir (31) is connected with a ball mill (21) through a circulating water pipe (32) for providing required water in the ball mill; the other end of the filter press (30) is connected with a solid processing device.
6. The electrolytic aluminum hazardous waste overhaul slag fluorine-fixing and cyanide-removing treatment system according to claim 5, wherein a filter (33) for filtering filtrate is arranged between the filter press (30) and the reservoir (31).
7. The electrolytic aluminum hazardous waste overhaul slag fluorine-fixing and cyanide-removing treatment system according to claim 5, wherein the circulating water pipe (32) is provided with a circulating pump (34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322783196.3U CN221063897U (en) | 2023-10-17 | 2023-10-17 | Electrolytic aluminum dangerous waste overhaul slag fluorine-fixing and cyanide-removing treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322783196.3U CN221063897U (en) | 2023-10-17 | 2023-10-17 | Electrolytic aluminum dangerous waste overhaul slag fluorine-fixing and cyanide-removing treatment system |
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| Publication Number | Publication Date |
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| CN221063897U true CN221063897U (en) | 2024-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202322783196.3U Active CN221063897U (en) | 2023-10-17 | 2023-10-17 | Electrolytic aluminum dangerous waste overhaul slag fluorine-fixing and cyanide-removing treatment system |
Country Status (1)
| Country | Link |
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| CN (1) | CN221063897U (en) |
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