CN108557870A - Metastannic acid retracting device in a kind of stripping tin waste liquid - Google Patents
Metastannic acid retracting device in a kind of stripping tin waste liquid Download PDFInfo
- Publication number
- CN108557870A CN108557870A CN201810423979.1A CN201810423979A CN108557870A CN 108557870 A CN108557870 A CN 108557870A CN 201810423979 A CN201810423979 A CN 201810423979A CN 108557870 A CN108557870 A CN 108557870A
- Authority
- CN
- China
- Prior art keywords
- stripping
- waste liquid
- retracting device
- metastannic acid
- tin
- 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.)
- Pending
Links
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 title claims abstract description 109
- AUYOHNUMSAGWQZ-UHFFFAOYSA-L dihydroxy(oxo)tin Chemical compound O[Sn](O)=O AUYOHNUMSAGWQZ-UHFFFAOYSA-L 0.000 title claims abstract description 66
- 239000002699 waste material Substances 0.000 title claims abstract description 58
- 239000007788 liquid Substances 0.000 title claims abstract description 56
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 66
- 238000005868 electrolysis reaction Methods 0.000 claims description 9
- 238000004458 analytical method Methods 0.000 claims description 7
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 claims description 6
- 229910001431 copper ion Inorganic materials 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims 2
- 230000007613 environmental effect Effects 0.000 abstract description 13
- 239000003513 alkali Substances 0.000 abstract description 4
- 238000007796 conventional method Methods 0.000 abstract description 4
- 239000007791 liquid phase Substances 0.000 abstract description 4
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 239000007790 solid phase Substances 0.000 abstract description 3
- 239000002351 wastewater Substances 0.000 description 9
- 238000004064 recycling Methods 0.000 description 8
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 7
- 229910017604 nitric acid Inorganic materials 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 4
- 230000001351 cycling effect Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 229910006069 SO3H Inorganic materials 0.000 description 2
- 229910009256 Sn(CH3SO3)2 Inorganic materials 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 229910003654 H2SnO3 Inorganic materials 0.000 description 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 1
- 239000000908 ammonium hydroxide Substances 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 230000007794 irritation Effects 0.000 description 1
- 239000010808 liquid waste Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G19/00—Compounds of tin
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Electrolytic Production Of Metals (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses metastannic acid retracting devices in a kind of stripping tin waste liquid, it is characterised in that：Metastannic acid retracting device includes stripping molten tin bath in the stripping tin waste liquid, for holding stripping tin liquor, metastannic acid retracting device also sets up hydrogen peroxide adding set, plate and frame filter press, centrifuge in the stripping tin waste liquid, plate and frame filter press is used for being dehydrated to metastannic acid, centrifuge is used for detaching metastannic acid, hydrogen peroxide adding set is connected to stripping molten tin bath, and the plate and frame filter press is connected with stripping molten tin bath, centrifuge.Metastannic acid retracting device is dehydrated stripping tin waste liquid by plate and frame filter press, centrifuge, is detached in stripping tin waste liquid disclosed in this invention, and solid phase is metastannic acid, and liquid phase is the stripping new liquid of tin.The a large amount of alkali consumption of conventional method is avoided, waste discharge amount, energy conservation and environmental protection are reduced.
Description
Technical field
The present invention relates to stripping tin waste liquid technical field, more particularly to metastannic acid retracting device in a kind of stripping tin waste liquid.
Background technology
Tin is present in metastannic acid colloidal form in salpeter solution in existing stripping tin waste liquid, need to use a large amount of alkali neutralization,
Then flocculant is used to capture separation.Nitric acid is that nitric acid decomposes when the stripping tin liquor of principal component generates chemical reaction, generates irritation
Smell, operating environment is poor, is unfavorable for the safety of operating personnel and the purification of environment.As environmental protection administration is to industrial wastewater discharge
In the controls such as ammonia nitrogen it is more and more tighter, and still very big to ammonium hydroxide, nitric acid usage amount in circuit board industry, environmental protection pressure is very big.
For the waste liquid that this quadrat method generates due to containing a large amount of nitric acid, wastewater treatment is difficult.Tin metal is dissolved in nitric acid, recovery process
Complexity, wasting manpower and material resources be easy to cause environmental pollution.Stripping tin waste liquid is recycled by producer in existing circuit board plant, but
It is that washing nitrogen content allows concentration of emission, nitrogenous highly concentrated waste water major part circuit board plant considerably beyond environmental protection administration after shelling tin
It is inside outer processing of discharging or entrust after dilution is handled, two methods cost is all higher, and in the presence of environmentally friendly risk.And existing stripping tin
It shells tin waste liquid in method to be not easy to recycle, waste of resource.
In order to solve the problems in the prior art, need to research and develop metastannic acid recycling dress in a kind of stripping tin waste liquid that nitrogen content is low
It sets.
Invention content
Purpose of the present invention is to：Overcome the shortcomings of the prior art, solves problems of the prior art, one kind is provided
Metastannic acid retracting device in tin waste liquid is shelled, using link-suspended basket centrifuge or tube centrifuge as capital equipment, is carried out in stripping tin waste liquid
The extraction of metastannic acid colloid.Shell tin waste liquid can cycling and reutilization, reduce waste water and exhausted air quantity, environmental protection and energy saving.
The technical scheme is that：
Metastannic acid retracting device in a kind of stripping tin waste liquid, it is characterised in that：Metastannic acid retracting device in the stripping tin waste liquid
Including shelling molten tin bath, for holding stripping tin liquor, metastannic acid retracting device also sets up hydrogen peroxide adding set, plate in the stripping tin waste liquid
Frame filter press, centrifuge, plate and frame filter press are used for being dehydrated to metastannic acid, and centrifuge is used for detaching metastannic acid, hydrogen peroxide addition dress
It sets and is connected to stripping molten tin bath, the plate and frame filter press is connected with stripping molten tin bath, centrifuge.
Preferably, the centrifuge is link-suspended basket centrifuge or tube centrifuge.
Preferably, the centrifuge speed is 600-1200 revs/min.
Preferably, the centrifuge speed turns for 800-1200.
Preferably, filter cloth density used in the plate and frame filter press is 1-200um.
Preferably, filter cloth density used in the plate and frame filter press is 1-80um.
Preferably, metastannic acid retracting device further includes cupric electrolysis retracting device, cupric electrolysis recycling dress in the stripping tin waste liquid
It sets and is connected to stripping molten tin bath, for removing the copper ion in stripping molten tin bath.
Preferably, metastannic acid retracting device further includes hydrogen peroxide on-line analysis device in the stripping tin waste liquid, and hydrogen peroxide exists
Line analysis device is connect with hydrogen peroxide automatic adding device and stripping molten tin bath, for analyzing hydrogen peroxide surplus, and according to hydrogen peroxide
Surplus starts hydrogen peroxide automatic adding device and adds hydrogen peroxide automatically.
Advantages of the present invention：
1, in stripping tin waste liquid disclosed in this invention metastannic acid retracting device by centrifuge to stripping tin waste liquid be dehydrated,
Separation, solid phase are metastannic acid, and liquid phase is the stripping new liquid of tin.The a large amount of alkali consumption of conventional method is avoided, waste discharge amount is reduced.It does not need
Use the flocculants such as PAM.Energy conservation and environmental protection.
2, by using centrifuge detach stripping tin generate metastannic acid, shell tin liquor energy cycling and reutilization, environmental protection, save at
This.
3, washing waste water is free of ammonia nitrogen, Ke Yizhi after metastannic acid retracting device stripping tin in stripping tin waste liquid disclosed in this invention
Run in and put, without especially processing, is good for the environment, saves environmental protection treatment cost.
4, when metastannic acid retracting device eliminates stripping tin using cupric electrolysis retracting device in stripping tin waste liquid disclosed in this invention
The copper ion that ground copper corrosion introduces completes recycling for stripping tin liquor, reduces discharge of wastewater.
5, metastannic acid retracting device consumes hydrogen peroxide in stripping tin waste liquid disclosed in this invention and hydrogen peroxide easily decomposes, so
Compare environmentally friendly.
6, metastannic acid retracting device uses hydrogen peroxide on-line analysis device and dioxygen in stripping tin waste liquid disclosed in this invention
Water automatic adding device controls hydrogen peroxide concentration and stablizes, it is ensured that stripping tin rate is consistent.High degree of automation simultaneously saves manpower.
7, centrifuge is link-suspended basket centrifuge or tube centrifuge operating high speed, can be sufficiently separated metastannic acid.
Description of the drawings
The invention will be further described with reference to the accompanying drawings and embodiments：
Fig. 1 is the schematic diagram of metastannic acid retracting device in stripping tin waste liquid of the present invention.
Specific implementation mode
Below in conjunction with the accompanying drawings and technical solution of the present invention is described in detail in preferred embodiment.
As shown in Figure 1, the present invention discloses metastannic acid retracting device in a kind of stripping tin waste liquid, metastannic acid in the stripping tin waste liquid
Retracting device includes stripping molten tin bath, and for holding stripping tin liquor, metastannic acid retracting device also sets up hydrogen peroxide and adds in the stripping tin waste liquid
Feeder apparatus, plate and frame filter press, centrifuge, plate and frame filter press are used for being dehydrated to metastannic acid, and centrifuge is used for detaching metastannic acid, dioxygen
Water adding set is connected to stripping molten tin bath, and the plate and frame filter press is connected with stripping molten tin bath with centrifuge.Stripping disclosed in this invention
Metastannic acid retracting device is dehydrated stripping tin waste liquid by centrifuge, is detached in tin waste liquid, and solid phase is metastannic acid, and liquid phase is stripping
The new liquid of tin.The a large amount of alkali consumption of conventional method is avoided, waste discharge amount is reduced.The flocculants such as PAM need not be used.Energy conservation and environmental protection.
The metastannic acid that stripping tin generates is detached by using centrifuge, shells tin liquor energy cycling and reutilization, environmental protection is cost-effective.
Preferably, the centrifuge is link-suspended basket centrifuge or tube centrifuge.This centrifuge operating high speed, can be fully
Detach metastannic acid.
Preferably, the centrifuge speed is 600-1200 revs/min.Separation is efficient.
Preferably, the centrifuge speed turns for 800-1200.Metastannic acid can further be efficiently separated.
Preferably, filter cloth density used in the plate and frame filter press is 1-200um.Fully realize dehydration.
Preferably, filter cloth density used in the plate and frame filter press is 1-80um.Further be conducive to metastannic acid dehydration,
Facilitate centrifugation.
Preferably, metastannic acid retracting device further includes cupric electrolysis retracting device, cupric electrolysis recycling dress in the stripping tin waste liquid
It sets and is connected to stripping molten tin bath, for removing the copper ion in stripping molten tin bath.Metastannic acid recycling dress in stripping tin waste liquid disclosed in this invention
The copper ion that ground copper corrosion introduces when eliminating stripping tin using cupric electrolysis retracting device is set, recycling for stripping tin liquor is completed, is dropped
Low discharge of wastewater.
Preferably, metastannic acid retracting device further includes hydrogen peroxide on-line analysis device in the stripping tin waste liquid, and hydrogen peroxide exists
Line analysis device is connect with hydrogen peroxide automatic adding device and stripping molten tin bath, for analyzing hydrogen peroxide surplus, and according to hydrogen peroxide
Surplus starts hydrogen peroxide automatic adding device and adds hydrogen peroxide automatically.Metastannic acid recycles in stripping tin waste liquid disclosed in this invention
The copper ion that ground copper corrosion introduces when device eliminates stripping tin using cupric electrolysis retracting device, completes recycling for stripping tin liquor,
Reduce discharge of wastewater.Washing waste water is free of ammonia nitrogen after metastannic acid retracting device stripping tin in stripping tin waste liquid disclosed in this invention, can
It is good for the environment without especially processing with direct emission, saves environmental protection treatment cost.
Metastannic acid retracting device processing system and method are simple in stripping tin waste liquid disclosed in this invention, reduce tin recycling at
This, so that production cost is greatly lowered in circuit board plant.
The liquid waste processing of traditional nitric acid stripping tin method, nitric acid are neutralized using NAOH, and tin mud (metastannic acid) separation, exhaust gas can not
It disposes completely.
Traditional industry wet method metastannic acid uses following equation for reaction principle：
Metastannic acid generates 3Sn+4HNO3+H2O→3H2SnO3+4NO
Exhaust-gas treatment 4NO+O2→2NO2
Exhaust-gas treatment 2NO2+Na2CO3→NaNO2+NaNO3+CO2
This obtained waste liquid of conventional method needs to carry out denitrogenation processing, of high cost, not environmentally.
Tin of the present invention uses following chemical principle with reacting in stripping tin liquor reactive tank,
Sn+H2O2+2CH3SO3H→Sn(CH3SO3)2+2H2O
Sn(CH3SO3)2+H2O2+H2O→H2SnO3+2CH3SO3H
Metastannic acid in stripping tin liquor is extracted by the above chemical principle and is used as metastannic acid semi-finished product, and it is de- to neutralize centrifugal drying
Finished product is metastannic acid colloid or powder after water.Washing waste water is free of ammonia nitrogen after shelling tin, can be handled without special with direct emission,
It is good for the environment, saves environmental protection treatment cost.It shells tin ability to stablize, the content of tin in stripping tin time control pharmacy bath will not be because of medicine
Theil indices increase and cause to shell the decline of tin ability in bath.
And metastannic acid retracting device in the stripping tin waste liquid of the present invention so that stripping tin liquor cycling and reutilization further reduces
Waste water and exhausted air quantity, environmental protection and energy saving.
Still there are many embodiment, all technical sides formed using equivalents or equivalent transformation by the present invention
Case is within the scope of the present invention.
Claims (8)
1. metastannic acid retracting device in a kind of stripping tin waste liquid, it is characterised in that：Metastannic acid retracting device packet in the stripping tin waste liquid
Stripping molten tin bath is included, for holding stripping tin liquor, metastannic acid retracting device also sets up hydrogen peroxide adding set, sheet frame in the stripping tin waste liquid
Filter press, centrifuge, plate and frame filter press are used for being dehydrated to metastannic acid, and centrifuge is used for detaching metastannic acid, hydrogen peroxide adding set
It is connected to stripping molten tin bath, the plate and frame filter press is connected with stripping molten tin bath, centrifuge.
2. metastannic acid retracting device in stripping tin waste liquid according to claim 1, it is characterised in that：The centrifuge is tripodia
Formula centrifuge or tube centrifuge.
3. metastannic acid retracting device in stripping tin waste liquid according to claim 1, it is characterised in that：The centrifuge speed is
600-1200 revs/min.
4. metastannic acid retracting device in stripping tin waste liquid according to claim 1, it is characterised in that：The centrifuge speed is
800-1200 turns.
5. metastannic acid retracting device in stripping tin waste liquid according to claim 1, it is characterised in that：The plate and frame filter press institute
It is 1-200um with filter cloth density.
6. metastannic acid retracting device in stripping tin waste liquid according to claim 1, it is characterised in that：The plate and frame filter press institute
It is 1-80um with filter cloth density.
7. metastannic acid retracting device in stripping tin waste liquid according to claim 1, it is characterised in that：In the stripping tin waste liquid partially
Stannic acid retracting device further includes cupric electrolysis retracting device, and cupric electrolysis retracting device is connected to stripping molten tin bath, for removing in stripping molten tin bath
Copper ion.
8. metastannic acid retracting device in stripping tin waste liquid according to claim 1, it is characterised in that：In the stripping tin waste liquid partially
Stannic acid retracting device further includes hydrogen peroxide on-line analysis device, hydrogen peroxide on-line analysis device and hydrogen peroxide automatic adding device and
Molten tin bath connection is shelled, for analyzing hydrogen peroxide surplus, and it is automatic according to hydrogen peroxide surplus startup hydrogen peroxide automatic adding device
Add hydrogen peroxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810423979.1A CN108557870A (en) | 2018-05-07 | 2018-05-07 | Metastannic acid retracting device in a kind of stripping tin waste liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810423979.1A CN108557870A (en) | 2018-05-07 | 2018-05-07 | Metastannic acid retracting device in a kind of stripping tin waste liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108557870A true CN108557870A (en) | 2018-09-21 |
Family
ID=63537848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810423979.1A Pending CN108557870A (en) | 2018-05-07 | 2018-05-07 | Metastannic acid retracting device in a kind of stripping tin waste liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108557870A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1920098A (en) * | 2005-08-23 | 2007-02-28 | 李德良 | Dissolved tin containing divalent copper compound and tin alloy solution |
| CN205223353U (en) * | 2015-11-06 | 2016-05-11 | 陶克（苏州）机械设备有限公司 | Tin waste liquid regeneration facility is shelled to nitric acid type |
| CN105714298A (en) * | 2016-03-23 | 2016-06-29 | 广东工业大学 | Tin stripping agent based on sulfuric acid-ferric salt system and preparing method of tin stripping agent |
| CN106676528A (en) * | 2015-11-06 | 2017-05-17 | 陶克（苏州）机械设备有限公司 | Regenerative device and method for nitric acid type solder stripping wastewater |
| CN208471559U (en) * | 2018-05-07 | 2019-02-05 | 昆山市新溢诚电子科技有限公司 | Metastannic acid recyclable device in a kind of stripping tin waste liquid |
-
2018
- 2018-05-07 CN CN201810423979.1A patent/CN108557870A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1920098A (en) * | 2005-08-23 | 2007-02-28 | 李德良 | Dissolved tin containing divalent copper compound and tin alloy solution |
| CN205223353U (en) * | 2015-11-06 | 2016-05-11 | 陶克（苏州）机械设备有限公司 | Tin waste liquid regeneration facility is shelled to nitric acid type |
| CN106676528A (en) * | 2015-11-06 | 2017-05-17 | 陶克（苏州）机械设备有限公司 | Regenerative device and method for nitric acid type solder stripping wastewater |
| CN105714298A (en) * | 2016-03-23 | 2016-06-29 | 广东工业大学 | Tin stripping agent based on sulfuric acid-ferric salt system and preparing method of tin stripping agent |
| CN208471559U (en) * | 2018-05-07 | 2019-02-05 | 昆山市新溢诚电子科技有限公司 | Metastannic acid recyclable device in a kind of stripping tin waste liquid |
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