CN108947063A - A kind of process of recycling treatment acidic etching waste liquid and alkaline etching waste liquid for producing - Google Patents
A kind of process of recycling treatment acidic etching waste liquid and alkaline etching waste liquid for producing Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0063—Hydrometallurgy
- C22B15/0084—Treating solutions
- C22B15/0086—Treating solutions by physical methods
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0063—Hydrometallurgy
- C22B15/0084—Treating solutions
- C22B15/0089—Treating solutions by chemical methods
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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- 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
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Abstract
The present invention relates to the processes of a kind of recycling treatment acidic etching waste liquid and alkaline etching waste liquid for producing, using the mixing to acidic etching waste liquid and alkaline etching waste liquid for producing, lye is added simultaneously, filters pressing is carried out after allotment pH value, respectively obtain copper-contained sludge and level-one filtrate, it is separately added into decoppering agent in level-one filtrate and flocculant carries out flocculating setting, then it is filtered separation, obtain cupric sediment and second level filtrate, second level filtrate is subjected to filter element filtering, obtain the three-level filtrate of no particulate matter, adjust the pH value of three-level filtrate, using cation exchange resin, obtain the three-level filtrate of copper content < 1ppm；Three-level filtrate first passes through vacuum distillation, respectively obtains sodium chloride crystallization and primary mother liquor；Primary mother liquor is pumped into thermostatical crystallization device, respectively obtains ammonium chloride crystals and secondary mother liquor, realizes the recycling of chlorine and ammonia in two kinds of waste liquids, accomplishes that the maximization of resource recycles.
Description
Technical field
The present invention relates to the process of disposal of resources contained waste liquid more particularly to a kind of recycling treatment acid etchings
The process of waste liquid and alkaline etching waste liquid for producing.
Background technique
PCB printed wiring board, is important electronic component, is the supporter of electronic component, is that electronic component is electrical
The carrier of connection.PCB production procedure: sawing sheet, heavy copper, pattern transfer, graphic plating, moves back the techniques such as film, etching at drilling, wherein
Etch process has acid etching, alkali etching, microetch carving technology, can all generate a large amount of etching waste liquor in etching process, etching
Waste liquid has the features such as complicated component, copper concentration is high, is danger wastes according to national dangerous waste register, cannot arbitrarily discharge, it is necessary to
By processing.
The common method of processing acidic etching waste liquid or alkaline etching waste liquid for producing mainly has at present: 1, etching solution method of reproduction: adopting
With direct electrolysis method or extraction electrolysis method, the extraction of copper and the recycling for etching sub- liquid in waste liquid are realized；2, it the copper precipitation method: adopts
Copper is precipitated from acidic etching waste liquid or alkaline etching waste liquid for producing with alkali, is prepared into the byproduct of copper.
Patent document CN103952704 A < the present invention relates to use acid and alkaline etching waste liquid for producing to prepare copper-bath
System and method > in make referrals to, acidic etching waste liquid and alkaline etching waste liquid for producing are uniformly mixed in pH conditioning tank, simultaneously
Lye is added and obtains hydroxide deposits, then uses sulfuric acid dissolution Kocide SD powder, obtains copper-bath.But this method
Obtained copper sediment finally will affect the quality of copper sulphate containing a large amount of sodium salt, while also ignore the production of high-purity ammonium chloride
The preparation method of product guarantees the quality of product.
Summary of the invention
The technical problem to be solved by the present invention is overcoming the deficiencies of the prior art and provide a kind of recycling treatment acidity erosion
The process of waste liquid and alkaline etching waste liquid for producing is carved, chlorine, ammonia, copper cannot be most during recycling in the previous two kinds of waste liquids of solution
The defect that bigization recycles.
The technical solution adopted by the present invention to solve the technical problems is: a kind of recycling treatment acidic etching waste liquid and alkali
The process of property etching waste liquor, comprising the following steps:
1. choosing acidic etching waste liquid, alkaline etching waste liquid for producing mixing, while lye is added, allotment forms the mixing that pH value is 7-9
Then solution carries out filters pressing, respectively obtain copper-contained sludge and level-one filtrate；
2. being separately added into decoppering agent in level-one filtrate and flocculant carrying out flocculating setting, it is then filtered separation, is contained
Copper sediment and second level filtrate；
3. second level filtrate is carried out filter element filtering, the three-level filtrate of no particulate matter is obtained；Then the PH to 4- of three-level filtrate is adjusted
6；
4. the three-level filtrate for regulating pH value is obtained the level Four filtrate of copper content < 1ppm using cation exchange resin；
5. the level Four filtrate of copper content < 1ppm is first passed through vacuum distillation, sodium chloride crystallization and primary mother liquor are respectively obtained；
6. primary mother liquor is pumped into thermostatical crystallization device, temperature in controller respectively obtains ammonium chloride crystals and secondary mother liquor.
Through the above scheme, using the mixing to acidic etching waste liquid and alkaline etching waste liquid for producing, while lye is added, deploys
Carry out filters pressing after pH value, respectively obtain copper-contained sludge and level-one filtrate, be separately added into level-one filtrate decoppering agent and flocculant into
Then row flocculating setting is filtered separation, obtain cupric sediment and second level filtrate, and second level filtrate is carried out filter element filtering,
The three-level filtrate of no particulate matter is obtained, the pH value for adjusting three-level filtrate obtains copper content < using cation exchange resin
The level Four filtrate of 1ppm；Level Four filtrate first passes through vacuum distillation, respectively obtains sodium chloride crystallization and primary mother liquor；Primary mother liquor pump
Enter in thermostatical crystallization device, respectively obtain ammonium chloride crystals and secondary mother liquor, realizes the recycling of chlorine and ammonia in two kinds of waste liquids, do
Maximization to resource recycles.
Further, 1. 2. copper-contained sludge and cupric sediment that step is obtained with step are handled according to the following steps:
I, it mixes copper-contained sludge and cupric sediment to form mixing copper-contained sludge, then be carried out through mixing copper-contained sludge
Drying；
II, by the mixing copper-contained sludge after drying, according to weight ratio and coal dust, quartz, lime stone, iron powder with 100: 8-
The ratio of 10:4-6:5-7:4-6 is matched, and is carried out melting subsequently into smelting furnace, is obtained the blister copper of copper factor > 80%.
Through the above scheme, copper-contained sludge and cupric sediment are mixed, is then dried, after drying
Mixing copper-contained sludge, according to weight ratio and coal dust, quartz, lime stone, iron powder with 100: 8-10:4-6:5-7:4-6 ratio
Example is matched, and is carried out melting subsequently into smelting furnace, the blister copper of copper factor > 80% is obtained, to obtain the blister copper of high-purity.
Further, the step 1. in, by acidic etching waste liquid and alkaline etching waste liquid for producing according to volume ratio 1:2-5 ratio
Mixing, while it is 7-9 that the pH value that concentration is 10%-30% lye to mixed solution, which is added,；
The lye of addition is ammonium carbonate or ammonium hydrogen carbonate or sodium hydroxide or potassium hydroxide one or more mixture.
Further, step 2. in, decoppering agent be vulcanized sodium or heavy metal chelating agent, concentration is 10-20%, by quality
Than additional proportion is 0.1-1%；
Flocculant is the Flokal B PAM that molecular weight is greater than 2,000,000, and concentration is 0.1-0.5%, and the flocculating setting time is 8-
10h obtains cupric sediment and second level filtrate after separating using sock filtration；
Further, step 3. in, second level filtrate by aperture be 1-5mm filter core be filtered；Adjust PH solvent be
Concentration is the hydrochloric acid of 10-15%.
Further, step 5. in, level Four filtrate is evaporated under reduced pressure through MVR or triple effect evaporation, and negative pressure is -0.08-
0.1Mpa, evaporation room temperature: 60-80 DEG C；
Further, step 6. in, temperature in the thermostatical crystallization device is controlled at 30-40 DEG C；
The secondary mother liquor is back in the three-level filtrate by cation exchange resin and carries out circulation distillation.
Further, in the step II, the smelting temperature of smelting furnace is 1100-1250 DEG C, and when melting blasts oxygen
Concentration is 60%-80%.
The beneficial effects of the present invention are:
By the mixing to acidic etching waste liquid and alkaline etching waste liquid for producing, while lye is added, carries out filters pressing after deploying pH value, point
Do not obtain copper-contained sludge and level-one filtrate, decoppering agent and flocculant be separately added into level-one filtrate and carries out flocculating setting, then into
Row is separated by filtration, and obtains cupric sediment and second level filtrate, and second level filtrate is carried out filter element filtering, obtains the three-level of no particulate matter
Filtrate, the pH value for adjusting three-level filtrate obtain the level Four filtrate of copper content < 1ppm using cation exchange resin；Level Four
Filtrate first passes through vacuum distillation, respectively obtains sodium chloride crystallization and primary mother liquor；Primary mother liquor is pumped into thermostatical crystallization device, respectively
Ammonium chloride crystals and secondary mother liquor are obtained, the recycling of chlorine and ammonia in two kinds of waste liquids is realized, accomplish the maximization recycling of resource
It utilizes.
Detailed description of the invention
The following further describes the present invention with reference to the drawings.
Fig. 1 is process flow chart of the invention.
Specific embodiment
Presently in connection with specific embodiment, the present invention is further illustrated.These attached drawings are simplified schematic diagram only with
Illustration illustrates basic structure of the invention, therefore it only shows the composition relevant to the invention.
Process flow chart as shown in Figure 1；
The process of a kind of recycling treatment acidic etching waste liquid and alkaline etching waste liquid for producing is provided, comprising the following steps:
1. acidic etching waste liquid and alkaline etching waste liquid for producing are mixed according to volume ratio 1:2-5 ratio, while it is 10%- that concentration, which is added,
The pH value of 30% lye to mixed solution is 7-9；
The lye of addition is ammonium carbonate or ammonium hydrogen carbonate or sodium hydroxide or potassium hydroxide one or more mixture, is then carried out
Filters pressing respectively obtains copper-contained sludge and level-one filtrate after can using filter press filters pressing；
2. being separately added into decoppering agent in level-one filtrate and flocculant carrying out flocculating setting, it is then filtered separation, decoppering agent
For vulcanized sodium or heavy metal chelating agent, concentration is 10-20%, and in mass ratio, additional proportion is 0.1-1%；
Flocculant is the Flokal B PAM that molecular weight is greater than 2,000,000, and concentration is 0.1-0.5%, and the flocculating setting time is 8-
10h obtains cupric sediment and second level filtrate after separating using sock filtration；
3. second level filtrate is filtered by the filter core that aperture is 1-5mm, the three-level filtrate of no particulate matter is obtained, is then adjusted
The PH to 4-6 of three-level filtrate, adjust PH solvent be concentration be 10-15% hydrochloric acid.
4. the three-level filtrate for regulating pH value is obtained the level Four filter of copper content < 1ppm using cation exchange resin
Liquid；
5. the level Four filtrate of copper content < 1ppm is first passed through vacuum distillation, sodium chloride crystallization and primary mother liquor are respectively obtained；Four
Grade filtrate can be evaporated under reduced pressure through MVR or triple effect evaporation, and negative pressure is -0.08-0.1Mpa, evaporation room temperature: 60-80 DEG C；
6. primary mother liquor is pumped into thermostatical crystallization device, temperature in controller respectively obtains ammonium chloride crystals and secondary mother liquor, permanent
Temperature in warm crystallizer is controlled at 30-40 DEG C；
Secondary mother liquor is back in the three-level filtrate by cation exchange resin and carries out circulation distillation.
1. 2. copper-contained sludge and cupric sediment that step is obtained with step can also be handled according to the following steps:
I, it mixes copper-contained sludge and cupric sediment to form mixing copper-contained sludge, then be carried out through mixing copper-contained sludge
Drying；
II, by the mixing copper-contained sludge after drying, according to weight ratio and coal dust, quartz, lime stone, iron powder with 100: 8-
The ratio of 10:4-6:5-7:4-6 is matched, and is carried out melting subsequently into smelting furnace, is obtained the blister copper of copper factor > 80%, melts
The smelting temperature of furnace is 1100-1250 DEG C, and it is 60%-80% that when melting, which blasts the concentration of oxygen,.
In actual operation, the mixing first to acidic etching waste liquid and alkaline etching waste liquid for producing, while lye is added, it deploys
Carry out filters pressing after pH value, respectively obtain copper-contained sludge and level-one filtrate, be separately added into level-one filtrate decoppering agent and flocculant into
Then row flocculating setting is filtered separation, obtain cupric sediment and second level filtrate, and second level filtrate is carried out filter element filtering,
The three-level filtrate of no particulate matter is obtained, the pH value for adjusting three-level filtrate obtains copper content < using cation exchange resin
The level Four filtrate of 1ppm；Level Four filtrate first passes through vacuum distillation, respectively obtains sodium chloride crystallization and primary mother liquor；Primary mother liquor pump
Enter in thermostatical crystallization device, respectively obtain ammonium chloride crystals and secondary mother liquor, realizes the recycling of chlorine and ammonia in two kinds of waste liquids, do
Maximization to resource recycles.
It mixes by copper-contained sludge and cupric sediment, is then dried, by the mixing cupric after drying
Sludge is matched according to weight ratio and coal dust, quartz, lime stone, iron powder with 100: 8-10:4-6:5-7:4-6 ratio
Than coal dust is as fuel, and quartz, lime stone, iron powder are respectively as slag former.
Melting is carried out subsequently into smelting furnace, obtains the blister copper of copper factor > 80%, to obtain the blister copper of high-purity, is solved
Determined chlorine, ammonia, copper in previous two kinds of waste liquids cannot maximize the defect of recycling during recycling.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (8)
1. a kind of process of recycling treatment acidic etching waste liquid and alkaline etching waste liquid for producing, characterized in that including following step
It is rapid:
1. choosing acidic etching waste liquid, alkaline etching waste liquid for producing mixing, while lye is added, allotment forms the mixing that pH value is 7-9
Then solution carries out filters pressing, respectively obtain copper-contained sludge and level-one filtrate；
2. being separately added into decoppering agent in level-one filtrate and flocculant carrying out flocculating setting, it is then filtered separation, is contained
Copper sediment and second level filtrate；
3. second level filtrate is carried out filter element filtering, the three-level filtrate of no particulate matter is obtained；Then the PH to 4- of three-level filtrate is adjusted
6；
4. the three-level filtrate for regulating pH value is obtained the level Four filtrate of copper content < 1ppm using cation exchange resin；
5. the level Four filtrate of copper content < 1ppm is first passed through vacuum distillation, sodium chloride crystallization and primary mother liquor are respectively obtained；
6. primary mother liquor is pumped into thermostatical crystallization device, temperature in controller respectively obtains ammonium chloride crystals and secondary mother liquor.
2. the process of a kind of recycling treatment acidic etching waste liquid and alkaline etching waste liquid for producing according to claim 1,
It is characterized in that
1. 2. copper-contained sludge and cupric sediment that step is obtained with step are handled according to the following steps:
I, it mixes copper-contained sludge and cupric sediment to form mixing copper-contained sludge, then be carried out through mixing copper-contained sludge
Drying；
II, by the mixing copper-contained sludge after drying, according to weight ratio and coal dust, quartz, lime stone, iron powder with 100:8-
The ratio of 10:4-6:5-7:4-6 is matched, and is carried out melting subsequently into smelting furnace, is obtained the blister copper of copper factor > 80%.
3. the process of a kind of recycling treatment acidic etching waste liquid and alkaline etching waste liquid for producing according to claim 1,
It is characterized in that the step 1. in, acidic etching waste liquid and alkaline etching waste liquid for producing are mixed according to volume ratio 1:2-5 ratio, together
When be added concentration be 10%-30% lye to the pH value of mixed solution be 7-9；
The lye of addition is ammonium carbonate or ammonium hydrogen carbonate or sodium hydroxide or potassium hydroxide one or more mixture.
4. the process of a kind of recycling treatment acidic etching waste liquid and alkaline etching waste liquid for producing according to claim 1,
It is characterized in that step 2. in, decoppering agent be vulcanized sodium or heavy metal chelating agent, concentration is 10-20%, in mass ratio, be added
Ratio is 0.1-1%；
Flocculant is the Flokal B PAM that molecular weight is greater than 2,000,000, and concentration is 0.1-0.5%, and the flocculating setting time is 8-
10h obtains cupric sediment and second level filtrate after separating using sock filtration.
5. the process of a kind of recycling treatment acidic etching waste liquid and alkaline etching waste liquid for producing according to claim 1,
It is characterized in that step 3. in, second level filtrate by aperture be 1-5mm filter core be filtered；The solvent for adjusting PH is concentration
It is the hydrochloric acid of 10-15%.
6. the process of a kind of recycling treatment acidic etching waste liquid and alkaline etching waste liquid for producing according to claim 1,
It is characterized in that step 5. in, level Four filtrate is evaporated under reduced pressure through MVR or triple effect evaporation, and negative pressure is -0.08-0.1Mpa, steam
Hair room temperature: 60-80 DEG C.
7. the process of a kind of recycling treatment acidic etching waste liquid and alkaline etching waste liquid for producing according to claim 1,
It is characterized in that step 6. in, temperature in the thermostatical crystallization device is controlled at 30-40 DEG C；
The secondary mother liquor is back in the three-level filtrate by cation exchange resin and carries out circulation distillation.
8. the process of a kind of recycling treatment acidic etching waste liquid and alkaline etching waste liquid for producing according to claim 2,
It is characterized in that the smelting temperature of smelting furnace is 1100-1250 DEG C in the step II, the concentration that when melting blasts oxygen is
60%-80%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109626643A (en) * | 2018-12-28 | 2019-04-16 | 九江德福科技股份有限公司 | A kind of waste water second level copper-removing method |
| CN111321300A (en) * | 2020-04-08 | 2020-06-23 | 上海环境工程设计研究院有限公司 | Recycling treatment system for copper-removed waste liquid and method for treating copper-removed waste liquid |
| CN112408458A (en) * | 2020-12-05 | 2021-02-26 | 苏州华锋环保技术有限公司 | Production equipment and production method of regenerated copper sulfate |
| CN113024045A (en) * | 2021-04-16 | 2021-06-25 | 深圳市龙岗区东江工业废物处置有限公司 | Treatment method and recovery method of mixed liquor |
| CN114772628A (en) * | 2022-04-22 | 2022-07-22 | 盛隆资源再生（无锡）有限公司 | Method for recovering waste etching liquid |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109626643A (en) * | 2018-12-28 | 2019-04-16 | 九江德福科技股份有限公司 | A kind of waste water second level copper-removing method |
| CN111321300A (en) * | 2020-04-08 | 2020-06-23 | 上海环境工程设计研究院有限公司 | Recycling treatment system for copper-removed waste liquid and method for treating copper-removed waste liquid |
| CN112408458A (en) * | 2020-12-05 | 2021-02-26 | 苏州华锋环保技术有限公司 | Production equipment and production method of regenerated copper sulfate |
| CN113024045A (en) * | 2021-04-16 | 2021-06-25 | 深圳市龙岗区东江工业废物处置有限公司 | Treatment method and recovery method of mixed liquor |
| CN114772628A (en) * | 2022-04-22 | 2022-07-22 | 盛隆资源再生（无锡）有限公司 | Method for recovering waste etching liquid |
| CN114772628B (en) * | 2022-04-22 | 2024-02-06 | 盛隆资源再生（无锡）有限公司 | Recovery method of waste etching liquid |
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Address after: Room 401, No. 10, 1228 Lane, Jiangchang Road, Jing'an District, Shanghai 200000 Applicant after: SHANGHAI INSTITUTE FOR DESIGN & RESEARCH ON ENVIRONMENTAL ENGINEERING Address before: 200040 Shanghai Jing'an District Jiangchang Road 1228 Lane 10 Room 401 Shanghai Environmental Engineering Design Research Institute Co., Ltd. Applicant before: SHANGHAI INSTITUTE FOR DESIGN & RESEARCH ON ENVIRONMENTAL ENGINEERING |
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