CN114768504B - Efficient sulfur melting process - Google Patents
Efficient sulfur melting process Download PDFInfo
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- CN114768504B CN114768504B CN202210543012.3A CN202210543012A CN114768504B CN 114768504 B CN114768504 B CN 114768504B CN 202210543012 A CN202210543012 A CN 202210543012A CN 114768504 B CN114768504 B CN 114768504B
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- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 123
- 239000011593 sulfur Substances 0.000 title claims abstract description 123
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 120
- 238000010309 melting process Methods 0.000 title claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 66
- 239000006260 foam Substances 0.000 claims abstract description 60
- 238000002844 melting Methods 0.000 claims abstract description 43
- 230000008018 melting Effects 0.000 claims abstract description 43
- 230000008929 regeneration Effects 0.000 claims abstract description 16
- 238000011069 regeneration method Methods 0.000 claims abstract description 16
- 238000004064 recycling Methods 0.000 claims abstract description 13
- 239000003513 alkali Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 10
- 230000001172 regenerating effect Effects 0.000 claims description 8
- 230000002035 prolonged effect Effects 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 238000006477 desulfuration reaction Methods 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 239000006227 byproduct Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 238000010992 reflux Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 150000003839 salts Chemical group 0.000 abstract description 4
- 230000008719 thickening Effects 0.000 abstract description 4
- 230000000630 rising effect Effects 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 2
- 150000003568 thioethers Chemical class 0.000 description 2
- 239000012670 alkaline solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/73—After-treatment of removed components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/16—Cleaning-out devices, e.g. for removing the cake from the filter casing or for evacuating the last remnants of liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
- B01D37/04—Controlling the filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J6/00—Heat treatments such as Calcining; Fusing ; Pyrolysis
- B01J6/005—Fusing
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/002—Removal of contaminants
- C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
- C10K1/004—Sulfur containing contaminants, e.g. hydrogen sulfide
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
- C10K1/12—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids alkaline-reacting including the revival of the used wash liquors
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Combustion & Propulsion (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to a high-efficiency sulfur melting process, which is characterized in that: the sulfur-containing component in the water gas is absorbed and reacted by alkali liquor through a desulfurizing tower to form rich liquor, the rich liquor is regenerated by a regeneration tank with a self-suction ejector, sulfur foam is formed in the regeneration tank and overflows to a sulfur foam tank, the regenerated clear liquor overflows to a lean liquor tank for recycling, the sulfur foam is conveyed to a filter through a sulfur foam pump, the sulfur foam containing part of clear liquor is filtered, the aim of upgrading and thickening is fulfilled, and the thickened sulfur foam is pumped to a sulfur melting kettle for sulfur melting by a pump, and the clear liquor is recycled. The process can reduce the circulation amount of sulfur foam, delay the rising rate of the secondary salt, reduce the generation amount of the secondary salt, recycle clear liquid and greatly improve the quality of molten sulfur and the recovery rate of molten sulfur.
Description
Technical Field
The invention belongs to the field of chemical industry, and particularly relates to a high-efficiency sulfur melting process.
Background
In the chemical industry, a wet desulfurization process is often adopted to remove sulfides from sulfur-containing gases such as water gas, and the process is very important for recycling the removed sulfides. The existing sulfur melting technology directly recycles the overflow sulfur foam of the regeneration tank through the sulfur melting kettle for melting sulfur, in the technology, the overflow sulfur foam self-entrainment alkali liquor is more, the circulating amount of the sulfur melting kettle is large, the amount of recovered sulfur melting clear liquid is larger, the generation of clear liquid secondary salt is fast due to high-temperature heating of the sulfur melting kettle, the displacement amount of the alkali liquor discharged per year is large, the sulfur melting quality is reduced, and the sulfur recycling rate is low.
Disclosure of Invention
The invention aims to solve the problems and provide a high-efficiency sulfur melting process.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a high-efficiency sulfur melting process is characterized in that: a sulfur melting device is adopted to realize desulfurization and sulfur melting;
the sulfur melting device comprises: the bottom liquid outlet of the desulfurizing tower is connected with a rich liquid tank, the bottom liquid outlet of the rich liquid tank is connected with an ejector of a regeneration tank through a rich liquid pump, the upper overflow port of the regeneration tank is connected with a sulfur foam tank, the upper clear liquid port of the regeneration tank is connected with a lean liquid tank, the bottom foam pipe of the sulfur foam tank is connected with a filter through a sulfur foam pump, the bottom outlet of the filter is connected with an intermediate tank, the lower concentrated foam pipe of the intermediate tank is connected with a sulfur melting kettle through a concentrated foam pump, the upper liquid outlet of the sulfur melting kettle is connected with a cooling tank, and the lower outlet of the cooling tank is connected with a No. two storage tank;
the specific process comprises the following steps:
a. the water gas enters a desulfurizing tower from the bottom of the tower, and is subjected to countercurrent heat transfer with the spraying alkali liquor at the top of the tower through a transmission medium to absorb sulfur-containing substances in the water gas, so that a rich liquor is formed and enters a rich liquor tank from the bottom of the tower;
b. the rich liquid enters a regeneration tank through a regeneration tank ejector by a pump, and is oxidized and regenerated, formed sulfur foam overflows from the top of the regeneration tank to enter a sulfur foam tank, and clear liquid returns to a lean liquid tank from the bottom of the regeneration tank;
c. conveying the sulfur foam into a filter by a pump for upgrading and thickening, controlling the filtering pressure to be 1-100 KPa (a), adjusting the control steps of the filter according to the content of suspended sulfur in the filtered alkali liquor, recycling the sulfur foam subjected to upgrading and thickening to an intermediate tank, and recycling the supernatant into a lean liquor tank;
d. conveying the quality-improving and concentration-increasing sulfur foam of the middle tank to a sulfur melting kettle by a pump to heat and melt sulfur, and discharging the melted sulfur from the bottom of the sulfur melting kettle to form a sulfur cake as a byproduct; the sulfur melting clear liquid enters a cooling tank from the top of the sulfur melting kettle, enters a second storage tank after cooling, settling and separation, and is pumped into a lean liquid tank for recycling.
The upper part of the filter is provided with a clear liquid pipe which is connected with the lean liquid tank; the lower part of the filter is provided with a backflushing liquid pipe which is connected with a first storage tank.
The foam pipe is also connected with a fault pipe and an emergency pipe, the fault pipe is connected into a first storage pool, and the emergency pipe is connected with the dense foam pipe.
In the step c, the quality improvement and concentration increase are divided into six steps of liquid feeding, clear liquid backflow, filtration, backflushing, sedimentation and slag discharge; the time control of each step sequence is as follows: controlling the liquid inlet at 40-60 seconds, refluxing the clear liquid for 30-50 seconds, filtering for 1000-2000 seconds, backflushing for 30-50 seconds, settling for 8-120 seconds, and checking for 10-20 seconds; the filter control step sequence is adjusted, specifically: when the suspended sulfur is higher than 0.5g/l, the filtering time is shortened, and the backflushing time is prolonged by 5-10 seconds; when the suspended sulfur is lower than 0.5g/l, the filtering period is gradually prolonged, and the backflushing time is shortened by 5-10 seconds.
In the step d, the temperature in the sulfur melting kettle is controlled to be 120-135 ℃, the pressure is 0-0.4MPa, and the temperature of the top outlet of the tower is controlled to be 80-90 ℃.
The principle of the invention is as follows: the sulfur-containing component in the water gas is absorbed and reacted by alkali liquor through a desulfurizing tower to form rich liquor, the rich liquor is regenerated by a regeneration tank with a self-suction ejector, sulfur foam is formed in the regeneration tank and overflows to a sulfur foam tank, the regenerated clear liquor overflows to a lean liquor tank for recycling, the sulfur foam is pumped to a Golgi filter, the sulfur foam containing part of clear liquor is filtered, the aim of upgrading and thickening is fulfilled, and the thickened sulfur foam is pumped to a sulfur melting kettle for sulfur melting, and the clear liquor is recycled.
The beneficial effects of the invention are as follows: the device is internally provided with a sulfur foam filter, so that the quality improvement and the enrichment of the sulfur foam are realized, the circulating amount of the sulfur foam is reduced, the alkali liquid amount carried in the sulfur foam is reduced by 50%, the sulfur melting efficiency and the sulfur quality are improved, the steam consumption is reduced, and the steam consumption cost is effectively saved; by reducing the alkali liquid quantity carried by the sulfur melting foam and increasing the sulfur melting clear liquid cooling system, the rising rate of the secondary salt is delayed, the service life of alkali liquid is prolonged, the discharge amount of the alkali liquid is reduced, and the purposes of safety, environmental protection and continuous sulfur melting are realized.
Drawings
FIG. 1 is a process flow diagram of the present invention;
in the figure: 1-desulfurizing tower, 2-rich liquid tank, 3-rich liquid pump, 4-regenerating tank, 5-sulfur foam tank, 6-lean liquid tank, 7-sulfur foam pump, 8-Goer filter, 9-intermediate tank, 10-sulfur melting kettle, 11-cooling tank, 12-rich foam pump, 13-first storage tank and 14-second storage tank;
a-clear liquid pipe, B-foam pipe, B1-fault pipe, B2-emergency pipe, C-recoil liquid pipe and D-dense foam pipe.
Detailed Description
Example 1, see figure 1,
the working process comprises the following steps: the water gas enters a desulfurizing tower 1 from the bottom of the tower, and is subjected to countercurrent heat transfer with an alkaline solution sprayed from the top of the tower, sulfur-containing substances in the water gas are absorbed, so that a rich solution enters a rich solution tank 2 from the bottom of the tower, the rich solution enters a regenerating tank 4 through a regenerating tank ejector by a rich solution pump 3, the rich solution is regenerated in the regenerating tank, clear liquid at the bottom of the regenerating tank 4 enters a lean solution tank 6 for recycling, sulfur foam overflows from the top of the regenerating tank 4 and enters a sulfur foam tank 5, the collected sulfur foam is conveyed to a filter 8 by a sulfur foam pump 7, the sulfur foam filtered by the filter 8 enters an intermediate tank 9, the quality-improving and concentration-increasing sulfur foam is conveyed to a sulfur melting kettle 10 by a foam pump 12 for sulfur melting, sulfur is recovered at the bottom of the kettle, clear liquid at the top of the sulfur melting kettle 10 is cooled by a cooling tank 11 and then recovered to a No. two storage tank 14, and the lean solution tank 6 is pumped for recycling.
And (3) recycling filtered clear liquid and backflushing liquid of the filter 8: the filtered clear liquid enters the lean liquid tank 6 through the clear liquid pipe A, the backflushing liquid enters the first storage tank 13 through the backflushing liquid pipe C, and is conveyed to the sulfur melting kettle 10 by a pump to continuously melt sulfur, so that continuous and stable operation of the sulfur melting system is ensured.
When the filter 8 fails, the maintenance is planned, and when the time is long, the failure pipe B1 is put into service, and sulfur foam directly enters the first storage tank 13; when the filter 8 breaks down suddenly and the amount of sulfur foam is large, a control valve on the emergency pipe B2 is opened, and the sulfur enters the sulfur melting kettle 10 through the dense foam pipe D for sulfur melting.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (5)
1. A high-efficiency sulfur melting process is characterized in that: a sulfur melting device is adopted to realize desulfurization and sulfur melting;
the sulfur melting device comprises: the bottom liquid outlet of the desulfurizing tower (1) is connected with the rich liquid tank (2), the bottom liquid outlet of the rich liquid tank (2) is connected with an ejector of the regenerating tank (4) through the rich liquid pump (3), the upper overflow port of the regenerating tank (4) is connected with the sulfur foam tank (5), the upper clear liquid port of the regenerating tank (4) is connected with the lean liquid tank (6), the bottom foam pipe (B) of the sulfur foam tank (5) is connected with the filter (8) through the sulfur foam pump (7), the bottom outlet of the filter (8) is connected with the intermediate tank (9), the lower concentrated foam pipe (D) of the intermediate tank (9) is connected with the sulfur melting kettle (10) through the concentrated foam pump (12), the upper liquid outlet of the sulfur melting kettle (10) is connected with the cooling tank (11), and the lower outlet of the cooling tank (11) is connected with the No. two storage tanks (14);
the specific process comprises the following steps:
a. the water gas enters a desulfurizing tower (1) from the bottom of the tower, and is in countercurrent heat transfer with the spraying alkali liquor at the top of the tower through a transmission medium to absorb sulfur-containing substances in the water gas, so that a rich liquor is formed and enters a rich liquor tank (2) from the bottom of the tower;
b. the rich liquid enters a regeneration tank (4) through a regeneration tank injector by a pump, the formed sulfur foam overflows from the top of the regeneration tank to enter a sulfur foam tank (5), and clear liquid returns to a lean liquid tank (6) from the bottom of the regeneration tank (4);
c. conveying sulfur foam into a filter (8) by a pump for quality improvement and concentration enhancement, controlling the filtering pressure to be 1-100 KPa (a), adjusting the control steps of the filter according to the content of suspended sulfur in filtered alkali liquor, recycling the sulfur foam after quality improvement and concentration enhancement to a middle tank (9), and enabling the top clear liquid to enter a lean liquid tank (6) for recycling;
d. conveying the quality-improving and concentration-increasing sulfur foam of the intermediate tank (9) into a sulfur melting kettle (10) by a pump to heat and melt sulfur, and discharging the melted sulfur from the bottom of the sulfur melting kettle to form a sulfur cake as a byproduct; the sulfur melting clear liquid enters a cooling tank (11) from the top of the sulfur melting kettle, enters a second storage tank (14) after cooling, sedimentation and separation, and is pumped into a lean liquid tank (6) for recycling.
2. A high efficiency sulfur melting process as set forth in claim 1 wherein: the upper part of the filter (8) is provided with a clear liquid pipe (A), and the clear liquid pipe (A) is connected into the lean liquid tank (6); the lower part of the filter (8) is provided with a backflushing liquid pipe (C), and the backflushing liquid pipe (C) is connected into a first storage tank (13).
3. A high efficiency sulfur melting process as set forth in claim 1 wherein: the foam pipe (B) is also connected with a fault pipe (B1) and an emergency pipe (B2), the fault pipe (B1) is connected into a first storage tank (13), and the emergency pipe (B2) is connected with a dense foam pipe (D).
4. A high efficiency sulfur melting process as set forth in claim 1 wherein: in the step c, the quality improvement and concentration increase are divided into six steps of liquid feeding, clear liquid backflow, filtration, backflushing, sedimentation and slag discharge; the time control of each step sequence is as follows: controlling the liquid inlet at 40-60 seconds, refluxing the clear liquid for 30-50 seconds, filtering for 1000-2000 seconds, backflushing for 30-50 seconds, settling for 8-120 seconds, and checking for 10-20 seconds; the filter control step sequence is adjusted, specifically: when the suspended sulfur is higher than 0.5g/l, the filtering time is shortened, and the backflushing time is prolonged by 5-10 seconds; when the suspended sulfur is lower than 0.5g/l, the filtering period is gradually prolonged, and the backflushing time is shortened by 5-10 seconds.
5. A high efficiency sulfur melting process as set forth in claim 1 wherein: in the step d, the temperature in the sulfur melting kettle is controlled to be 120-135 ℃, the pressure is 0-0.4MPa, and the temperature of the top outlet of the tower is controlled to be 80-90 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210543012.3A CN114768504B (en) | 2022-05-19 | 2022-05-19 | Efficient sulfur melting process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210543012.3A CN114768504B (en) | 2022-05-19 | 2022-05-19 | Efficient sulfur melting process |
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| Publication Number | Publication Date |
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| CN114768504A CN114768504A (en) | 2022-07-22 |
| CN114768504B true CN114768504B (en) | 2023-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210543012.3A Active CN114768504B (en) | 2022-05-19 | 2022-05-19 | Efficient sulfur melting process |
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| Country | Link |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62183835A (en) * | 1985-10-11 | 1987-08-12 | ウ−テ−ベ−・ウムベルトテクニク・ブクス・ア−ゲ− | Method and device for desulfurizing gas containing hydrogen sulfide |
| CN207404839U (en) * | 2017-10-19 | 2018-05-25 | 云南鼎和环保科技有限公司 | The device of sulphur is recycled in a kind of wet desulfurizing process from sulphur foam solution |
| CN110331009A (en) * | 2019-07-19 | 2019-10-15 | 北京优艺康光学技术有限公司 | A kind of sulphur foam and doctor solution are separated by filtration technique |
-
2022
- 2022-05-19 CN CN202210543012.3A patent/CN114768504B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62183835A (en) * | 1985-10-11 | 1987-08-12 | ウ−テ−ベ−・ウムベルトテクニク・ブクス・ア−ゲ− | Method and device for desulfurizing gas containing hydrogen sulfide |
| CN207404839U (en) * | 2017-10-19 | 2018-05-25 | 云南鼎和环保科技有限公司 | The device of sulphur is recycled in a kind of wet desulfurizing process from sulphur foam solution |
| CN110331009A (en) * | 2019-07-19 | 2019-10-15 | 北京优艺康光学技术有限公司 | A kind of sulphur foam and doctor solution are separated by filtration technique |
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| CN114768504A (en) | 2022-07-22 |
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