CN105648472A - Recycling method and system for tin in tin stripping waste liquid and tin stripping waste liquid - Google Patents
Recycling method and system for tin in tin stripping waste liquid and tin stripping waste liquid Download PDFInfo
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- CN105648472A CN105648472A CN201610044322.5A CN201610044322A CN105648472A CN 105648472 A CN105648472 A CN 105648472A CN 201610044322 A CN201610044322 A CN 201610044322A CN 105648472 A CN105648472 A CN 105648472A
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- tin
- waste liquor
- stannum
- removal waste
- nitric acid
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
- C25C1/14—Electrolytic production, recovery or refining of metals by electrolysis of solutions of tin
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/30—Acidic compositions for etching other metallic material
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/46—Regeneration of etching compositions
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
Abstract
The invention discloses a recycling method and system for tin in tin stripping waste liquid and tin stripping waste liquid. Firstly, the tin stripping waste liquid is guided into a nitric acid separation system, nitric acid is extracted and separated from the tin stripping waste liquid, first-level treating liquid is obtained at the same time, and the concentration of tin contained in the tin stripping waste liquid is larger than a preset value; and then the first-level treating liquid is guided into an electrolysis system for an electro-deposition reaction, the simple-substance tin and second-level treating liquid are obtained, and the concentration of tin contained in the second-level treating liquid is equal to or smaller than the preset value. Thus, tin can be efficiently recycled from the tin stripping waste liquid, tin resources can be recycled, and the effect of saving resources is achieved.
Description
Technical field
The application relates to environmental technology field, particularly relates to the recovery method of stannum, system and tin stripping liquid in a kind of tin removal waste liquor.
Background technology
Stannum is a kind of rare and that price is high heavy metal, stannum all has been widely used in national economy and national defense construction every field, along with society's being continuously increased stannum demand, the application expanding day of stannum, particularly at the electronics of high speed development day by day and numeral message area. But along with economic fast development, be faced with the decline of tin ore grade both at home and abroad all to some extent, following resource is not enough, hard case of resource exhaustion.
The traditional treatment method of tin resource is included live method process, wet treatment, the sedimentation method and the way of distillation etc., but these methods all exist the serious problems such as material consumption is big, metal recovery rate is low, wastewater flow rate is big. Therefore, in tin resource exploitation process, need a kind of technology can reclaim stannum from discarded containing tin raw material (includes solution and solid waste), and recycle and move back stannum other useful constituent of medicinal liquid synthetical recovery, without discharging of waste liquid, the method that metal recovery rate is high becomes increasingly important, and this is the trend of resource rational utilization.
Summary of the invention
The application is intended to solve at least to a certain extent one of above-mentioned technical problem.
First aspect according to the application, the application provides the recovery method of stannum in a kind of tin removal waste liquor, in described tin removal waste liquor, the recovery method of stannum processes for a kind of tin removal waste liquor, described tin removal waste liquor is to adopt tin stripping liquid to carry out moving back stannum to process gained, described tin stripping liquid comprises: nitric acid, slow releasing agent and tin plating additive, and in described tin removal waste liquor, the recovery method of stannum includes:
Described tin removal waste liquor being imported nitric acid piece-rate system, goes out nitric acid with extract and separate from described coagulation liquid, obtain coagulation liquid simultaneously, contained by described tin removal waste liquor, tin concentration is more than preset value;
Described coagulation liquid being imported electrolysis system and carries out electrodeposit reaction, obtain simple substance stannum and two stage treatment liquid, in described two stage treatment liquid, contained tin concentration is equal to or less than described preset value.
Further, the regeneration method of described tin removal waste liquor also includes:
Described two stage treatment liquid is adjusted to the level required by described tin stripping liquid.
Further, described slow releasing agent adopts pyrovinic acid; Described tin plating additive adopts one or more the combination in brightener, leveling agent and antioxidant;Described extraction extractant is tbp; Described electrolysis system anode material is scribble the analysis titanium plate of oxygen noble coatings, titanium net or titanium pipe, and cathode material is titanium plate, corrosion resistant plate or sheet tin, and electrolysis bath is new electrobath or tube type electrolytic tank.
Further, in described tin removal waste liquor, the mass concentration of stannum is 50-80g/L; The volume percent content of described nitric acid is 1-5%; The mass concentration of described slow releasing agent is 80-150g/L; The mass concentration of described tin plating additive is 1-5g/L; Described preset value is 15-20g/L; The volume percent content of described extractant is 30-50%; Described electro-deposition parameter is: electric current density is 150-800A/m2, temperature 20-50 DEG C.
Second aspect according to the application, the application provides the recovery system of stannum in a kind of tin removal waste liquor, in described tin removal waste liquor, the recovery system of stannum processes for a kind of tin removal waste liquor, described tin removal waste liquor is to adopt tin stripping liquid to carry out moving back stannum to process gained, described tin stripping liquid comprises: nitric acid, slow releasing agent and tin plating additive, and in described tin removal waste liquor, the recovery system of stannum includes:
Working cylinder, is used for storing described tin removal waste liquor, and contained by described tin removal waste liquor, tin concentration is more than preset value;
Nitric acid piece-rate system, is used for importing described tin removal waste liquor, and extract and separate goes out nitric acid from described tin removal waste liquor, obtain coagulation liquid simultaneously;
Electrolysis system, is used for importing described coagulation liquid and carrying out electrodeposit reaction, obtains simple substance stannum and two stage treatment liquid, and in described two stage treatment liquid, contained tin concentration is equal to or less than described preset value.
Further, in described tin removal waste liquor, the recovery system of stannum also includes:
Temporary cylinder, is used for importing described two stage treatment liquid, and adjusts described two stage treatment liquid to the level required by described tin stripping liquid.
Further, described slow releasing agent adopts pyrovinic acid; Described tin plating additive adopts one or more the combination in brightener, leveling agent and antioxidant; Described extraction extractant is tbp; Described electrolysis system anode material is scribble the analysis titanium plate of oxygen noble coatings, titanium net or titanium pipe, and cathode material is titanium plate, corrosion resistant plate or sheet tin, and electrolysis bath is new electrobath or tube type electrolytic tank.
Further, in described tin removal waste liquor, the mass concentration of stannum is 50-80g/L; The volume percent content of described nitric acid is 1-5%; The mass concentration of described slow releasing agent is 80-150g/L; The mass concentration of described tin plating additive is 1-5g/L; Described preset value is 15-20g/L; The volume percent content of described extractant is 30-50%; Described electro-deposition parameter is: electric current density is 150-800A/m2, temperature 20-50 DEG C.
The third aspect according to the application, the application provides a kind of tin stripping liquid, including: nitric acid, slow releasing agent and tin plating additive, described slow releasing agent adopts pyrovinic acid; Described tin plating additive adopts one or more the combination in brightener, leveling agent and antioxidant.
Further, the solution concentration of described nitric acid is 1-5%; The mass concentration of described slow releasing agent is 80-150g/L; The mass concentration of described tin plating additive is 1-5g/L.
The application provides the benefit that:
By providing the recovery method of stannum, system and tin stripping liquid in a kind of tin removal waste liquor, first, tin removal waste liquor is imported nitric acid piece-rate system, go out nitric acid with extract and separate from tin removal waste liquor, obtaining coagulation liquid, contained by described tin removal waste liquor, tin concentration is more than preset value simultaneously; Then, coagulation liquid being imported electrolysis system and carries out electrodeposit reaction, obtain simple substance stannum and two stage treatment liquid, in two stage treatment liquid, contained tin concentration is equal to or less than described preset value. So, can from tin removal waste liquor high efficiente callback stannum, it is achieved the recycle and reuse of tin resource, reach resource-effective effect.
Accompanying drawing explanation
Fig. 1 be the embodiment of the present application one tin removal waste liquor in the structural representation of recovery system of stannum.
Fig. 2 be the embodiment of the present application one tin removal waste liquor in the schematic flow sheet of recovery method of stannum.
Detailed description of the invention
Being described below in detail embodiments herein, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of same or like function from start to finish. The embodiment described below with reference to accompanying drawing is illustrative of, it is intended to be used for explaining the application, and it is not intended that restriction to the application.
The application is described in further detail in conjunction with accompanying drawing below by detailed description of the invention.
As shown in Figure 1, the embodiment of the present application provides the recovery system of stannum in a kind of tin removal waste liquor, in this tin removal waste liquor, the recovery system of stannum processes for a kind of tin removal waste liquor, tin removal waste liquor is to adopt tin stripping liquid to carry out moving back stannum to process gained, tin stripping liquid comprises: nitric acid, slow releasing agent and tin plating additive, and in tin removal waste liquor, the recovery system of stannum includes:
Working cylinder 101, is used for storing tin removal waste liquor, and contained by tin removal waste liquor, tin concentration is more than preset value;
Nitric acid piece-rate system 102, is used for importing tin removal waste liquor, and extract and separate goes out nitric acid from tin removal waste liquor, obtains coagulation liquid simultaneously;
Electrolysis system 103, is used for importing coagulation liquid and carrying out electrodeposit reaction, obtains simple substance stannum and two stage treatment liquid, and in two stage treatment liquid, contained tin concentration is equal to or less than above-mentioned preset value.
In tin removal waste liquor, the recovery system of stannum also includes:
Temporary cylinder 104, is used for importing two stage treatment liquid, and adjusts two stage treatment liquid to the level required by tin stripping liquid, concrete, adjusts adjustable composition or component accounting etc. Thus the liquid of gained after process can be recycled as tin stripping liquid, reach the effect of energy-conserving and environment-protective.
Wherein, slow releasing agent adopts pyrovinic acid; Tin plating additive adopts one or more the combination in brightener, leveling agent and antioxidant; Extraction extractant is tbp; Electrolysis system 103 anode material is scribble the analysis titanium plate of oxygen noble coatings, titanium net or titanium pipe, and cathode material is titanium plate, corrosion resistant plate or sheet tin, and electrolysis bath is new electrobath or tube type electrolytic tank.
In tin removal waste liquor, the mass concentration of stannum is 50-80g/L; The volume percent content of nitric acid is 1-5%; The mass concentration of slow releasing agent is 80-150g/L; The mass concentration of tin plating additive is 1-5g/L; Preset value is 15-20g/L; The volume percent content of extractant is 30-50%; Electro-deposition parameter is: electric current density is 150-800A/m2, temperature 20-50 DEG C.
As shown in Figure 2, corresponding the embodiment of the present application additionally provides the recovery method of stannum in a kind of tin removal waste liquor, in this tin removal waste liquor, the recovery method of stannum processes for a kind of tin removal waste liquor, tin removal waste liquor is to adopt tin stripping liquid to carry out moving back stannum to process gained, tin stripping liquid comprises: nitric acid, slow releasing agent and tin plating additive, and in tin removal waste liquor, the recovery method of stannum includes:
201, tin removal waste liquor is imported nitric acid piece-rate system, goes out nitric acid with extract and separate from tin removal waste liquor, obtain coagulation liquid simultaneously, contained by tin removal waste liquor, tin concentration is more than preset value;
202, coagulation liquid is imported electrolysis system and carries out electrodeposit reaction, obtain simple substance stannum and two stage treatment liquid, in two stage treatment liquid, contained tin concentration is equal to or less than above-mentioned preset value.
The regeneration method of above-mentioned tin removal waste liquor also includes:
203, two stage treatment liquid is adjusted to the level required by tin stripping liquid, thus the liquid of gained after process can be recycled as tin stripping liquid, reach the effect of energy-conserving and environment-protective.
As a kind of embodiment, can also be without in other embodiments comprising temporary cylinder 104, accordingly, do not include the process of step 203.
The recovery method of stannum, system and tin stripping liquid in the tin removal waste liquor of the application are described below by several specific embodiments.
Embodiment one:
The volume percent content adopting nitric acid is 3%, the mass concentration of pyrovinic acid is 90g/L, the mass concentration of tin plating additive is that 2g/L prepares tin stripping liquid and carries out moving back stannum on stannum production line and process moving back, saturated tin-stripping solution enters nitric acid piece-rate system extraction mode and carries out nitric acid separation, the volume percent content of extractant is 30-50%, separates nitric acid efficiency and reaches 98%. Separate the entrance electro-deposition system of the tin-stripping solution after nitric acid and carry out electro-deposition recovery stannum, electrolytic parameter condition: electric current density is 200A/m2, temperature 25 DEG C. During electrolysis, anode scribbles the titanium plate of analysis oxygen noble coatings, and negative electrode material is titanium plate. When the mass concentration of stannum (Sn) ion is lower than 15g/L, electrolysis terminates, and after electrolysis terminates, electrolyte can recycle as molten tin liquor through overregulating component. Through test analysis, stannum purity reaches 99.84%.
Embodiment two:
The volume percent content adopting nitric acid is 3%, the mass concentration of pyrovinic acid is 120g/L, the mass concentration of tin plating additive is that 3g/L prepares tin stripping liquid and carries out moving back stannum on stannum production line and process moving back, saturated tin-stripping solution enters nitric acid piece-rate system extraction mode and carries out nitric acid separation, the volume percent content of extractant is 30-50%, separates nitric acid efficiency and reaches 98%. Separate the entrance electro-deposition system of the tin-stripping solution after nitric acid and carry out electro-deposition recovery stannum, electrolytic parameter condition: electric current density is 300A/m2, temperature 30 DEG C. During electrolysis, anode scribbles the titanium plate of analysis oxygen noble coatings, and negative electrode material is titanium plate. When the mass concentration of Sn ion is lower than 15g/L, electrolysis terminates, and after electrolysis terminates, electrolyte can recycle as molten tin liquor through overregulating component. Through test analysis, stannum purity reaches 99.81%.
Embodiment three:
Adopt volume percent content 4% that concentration of nitric acid is, the mass concentration of pyrovinic acid is 150g/L, the mass concentration of tin plating additive is that 4g/L prepares tin stripping liquid and carries out moving back stannum on stannum production line and process moving back, saturated tin-stripping solution enters nitric acid piece-rate system extraction mode and carries out nitric acid separation, the volume percent content of extractant is 30-50%, separates nitric acid efficiency and reaches 98%. Separate the entrance electro-deposition system of the tin-stripping solution after nitric acid and carry out electro-deposition recovery stannum, electrolytic parameter condition: electric current density is 400A/m2, temperature 35 DEG C. During electrolysis, anode scribbles the titanium plate of analysis oxygen noble coatings, and negative electrode material is titanium plate. When the mass concentration of Sn ion is lower than 15g/L, electrolysis terminates, and after electrolysis terminates, electrolyte can recycle as molten tin liquor through overregulating component. Through test analysis, stannum purity reaches 99.82%.
Embodiment four:
Adopt volume percent content 5% that concentration of nitric acid is, the mass concentration of pyrovinic acid is 120g/L, the mass concentration of tin plating additive is that 5g/L prepares tin stripping liquid and carries out moving back stannum on stannum production line and process moving back, saturated tin-stripping solution enters nitric acid piece-rate system extraction mode and carries out nitric acid separation, the volume percent content of extractant is 30-50%, separates nitric acid efficiency and reaches 98%. Separate the entrance electro-deposition system of the tin-stripping solution after nitric acid and carry out electro-deposition recovery stannum, electrolytic parameter condition: electric current density is 600A/m2, temperature 40 DEG C.During electrolysis, anode scribbles the titanium pipe of analysis oxygen noble coatings, and negative electrode material is titanium plate. When the mass concentration of Sn ion is lower than 15g/L, electrolysis terminates, and after electrolysis terminates, electrolyte can recycle as molten tin liquor through overregulating component. Through test analysis, stannum purity reaches 99.86%.
Embodiment five:
The volume percent content adopting nitric acid is 5%, the mass concentration of pyrovinic acid is 100g/L, the mass concentration of tin plating additive is that 5g/L prepares tin stripping liquid and carries out moving back stannum on stannum production line and process moving back, saturated tin-stripping solution enters nitric acid piece-rate system extraction mode and carries out nitric acid separation, the volume percent content of extractant is 30-50%, separates nitric acid efficiency and reaches 98%. Separate the entrance electro-deposition system of the tin-stripping solution after nitric acid and carry out electro-deposition recovery stannum, electrolytic parameter condition: electric current density is 800A/m2, temperature 50 C. During electrolysis, anode scribbles the titanium plate of analysis oxygen noble coatings, and negative electrode material is titanium plate. When the mass concentration of Sn ion is lower than 15g/L, electrolysis terminates, and after electrolysis terminates, electrolyte can recycle as molten tin liquor through overregulating component. Through test analysis, stannum purity reaches 99.89%.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means in conjunction with this embodiment or example describe are contained at least one embodiment or the example of the application. In this manual, the schematic representation of above-mentioned term is not necessarily referring to identical embodiment or example. And, the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiments or example.
Above content is further description the application made in conjunction with specific embodiment, it is impossible to assert the application be embodied as be confined to these explanations. For the application person of an ordinary skill in the technical field, under the premise conceived without departing from the application, it is also possible to make some simple deduction or replace.
Claims (10)
1. the recovery method of stannum in a tin removal waste liquor, it is characterized in that, in described tin removal waste liquor, the recovery method of stannum processes for a kind of tin removal waste liquor, described tin removal waste liquor is to adopt tin stripping liquid to carry out moving back stannum to process gained, described tin stripping liquid comprises: nitric acid, slow releasing agent and tin plating additive, and in described tin removal waste liquor, the recovery method of stannum includes:
Described tin removal waste liquor being imported nitric acid piece-rate system, goes out nitric acid with extract and separate from described tin removal waste liquor, obtain coagulation liquid simultaneously, contained by described tin removal waste liquor, tin concentration is more than preset value;
Described coagulation liquid being imported electrolysis system and carries out electrodeposit reaction, obtain simple substance stannum and two stage treatment liquid, in described two stage treatment liquid, contained tin concentration is equal to or less than described preset value.
2. the recovery method of stannum in tin removal waste liquor as claimed in claim 1, it is characterised in that the regeneration method of described tin removal waste liquor also includes:
Described two stage treatment liquid is adjusted to the level required by described tin stripping liquid.
3. the recovery method of stannum in tin removal waste liquor as claimed in claim 1, it is characterised in that described slow releasing agent adopts pyrovinic acid; Described tin plating additive adopts one or more the combination in brightener, leveling agent and antioxidant; Described extraction extractant is tbp; Described electrolysis system anode material is scribble the analysis titanium plate of oxygen noble coatings, titanium net or titanium pipe, and cathode material is titanium plate, corrosion resistant plate or sheet tin, and electrolysis bath is new electrobath or tube type electrolytic tank.
4. the recovery method of stannum in tin removal waste liquor as claimed in claim 3, it is characterised in that in described tin removal waste liquor, the mass concentration of stannum is 50-80g/L;The volume percent content of described nitric acid is 1-5%; The mass concentration of described slow releasing agent is 80-150g/L; The mass concentration of described tin plating additive is 1-5g/L; Described preset value is 15-20g/L; The volume percent content of described extractant is 30-50%; Described electro-deposition parameter is: electric current density be 150-800A/m2, temperature 20-50 DEG C.
5. the recovery system of stannum in a tin removal waste liquor, it is characterized in that, in described tin removal waste liquor, the recovery system of stannum processes for a kind of tin removal waste liquor, described tin removal waste liquor is to adopt tin stripping liquid to carry out moving back stannum to process gained, described tin stripping liquid comprises: nitric acid, slow releasing agent and tin plating additive, and in described tin removal waste liquor, the recovery system of stannum includes:
Working cylinder, is used for storing described tin removal waste liquor, and contained by described tin removal waste liquor, tin concentration is more than preset value;
Nitric acid piece-rate system, is used for importing described tin removal waste liquor, and extract and separate goes out nitric acid from described tin removal waste liquor, obtain coagulation liquid simultaneously;
Electrolysis system, is used for importing described coagulation liquid and carrying out electrodeposit reaction, obtains simple substance stannum and two stage treatment liquid, and in described two stage treatment liquid, contained tin concentration is equal to or less than described preset value.
6. the recovery system of stannum in tin removal waste liquor as claimed in claim 5, it is characterised in that in described tin removal waste liquor, the recovery system of stannum also includes:
Temporary cylinder, is used for importing described two stage treatment liquid, and adjusts described two stage treatment liquid to the level required by described tin stripping liquid.
7. the recovery system of stannum in tin removal waste liquor as claimed in claim 5, it is characterised in that described slow releasing agent adopts pyrovinic acid; Described tin plating additive adopts one or more the combination in brightener, leveling agent and antioxidant; Described extraction extractant is tbp; Described electrolysis system anode material is scribble the analysis titanium plate of oxygen noble coatings, titanium net or titanium pipe, and cathode material is titanium plate, corrosion resistant plate or sheet tin, and electrolysis bath is new electrobath or tube type electrolytic tank.
8. the recovery system of stannum in tin removal waste liquor as claimed in claim 7, it is characterised in that in described tin removal waste liquor, the mass concentration of stannum is 50-80g/L; The volume percent content of described nitric acid is 1-5%; The mass concentration of described slow releasing agent is 80-150g/L; The mass concentration of described tin plating additive is 1-5g/L; Described preset value is 15-20g/L; The volume percent content of described extractant is 30-50%; Described electro-deposition parameter is: electric current density is 150-800A/m2, temperature 20-50 DEG C.
9. a tin stripping liquid, it is characterised in that including: nitric acid, slow releasing agent and tin plating additive, described slow releasing agent adopts pyrovinic acid; Described tin plating additive adopts one or more the combination in brightener, leveling agent and antioxidant.
10. tin stripping liquid as claimed in claim 9, it is characterised in that the solution concentration of described nitric acid is 1-5%; The mass concentration of described slow releasing agent is 80-150g/L; The mass concentration of described tin plating additive is 1-5g/L.
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| CN106048653A (en) * | 2016-07-28 | 2016-10-26 | 昆山金易得环保科技有限公司 | Method for recovering simple substance tin |
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| CN106048612B (en) * | 2016-07-28 | 2017-04-26 | 昆山金易得环保科技有限公司 | Tin removing liquid and method for removing tin-contained layer on base material |
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