CN112981459A - Method for electrolytic refining of coarse soldering tin - Google Patents
Method for electrolytic refining of coarse soldering tin Download PDFInfo
- Publication number
- CN112981459A CN112981459A CN202110272888.4A CN202110272888A CN112981459A CN 112981459 A CN112981459 A CN 112981459A CN 202110272888 A CN202110272888 A CN 202110272888A CN 112981459 A CN112981459 A CN 112981459A
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- CN
- China
- Prior art keywords
- soldering tin
- electrolyte
- electrolytic refining
- cathode
- concentration
- 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.)
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Links
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000007670 refining Methods 0.000 title claims abstract description 26
- 238000005476 soldering Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000003792 electrolyte Substances 0.000 claims abstract description 20
- AFVFQIVMOAPDHO-UHFFFAOYSA-N methanesulfonic acid Substances CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000654 additive Substances 0.000 claims abstract description 8
- 230000000996 additive effect Effects 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 6
- 239000010935 stainless steel Substances 0.000 claims abstract description 6
- 229910052718 tin Inorganic materials 0.000 claims description 26
- 239000012535 impurity Substances 0.000 claims description 8
- 229910000679 solder Inorganic materials 0.000 claims description 6
- -1 alkyl naphthalene sulfonate Chemical compound 0.000 claims description 5
- 229910052745 lead Inorganic materials 0.000 claims description 5
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 239000002253 acid Substances 0.000 description 7
- 238000005868 electrolysis reaction Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 229910004014 SiF4 Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229940098779 methanesulfonic acid Drugs 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
The invention relates to a method for electrolytic refining of coarse soldering tin, and belongs to the technical field of wet metallurgy. The crude soldering tin is used as an anode plate, the stainless steel is used as a cathode plate, and the concentration of the main component is 50-150g/L, Sn g/g of methanesulfonic acid2++Pb2+Controlling the cathode current density of 125-250A/m in the electrolyte with the concentration of 30-160g/L and the total additive amount of 0.8-3g/L2The distance between the electrodes is 25-100mm, the temperature of the electrolyte is 20-50 ℃, the cathode discharging period is 4-7d, and the refined soldering tin and the anode mud are obtained through electrolytic refining. The invention adopts cleaner electrolyte and carries out electrolytic refining by matching with the specific electrolytic process of the invention, and has the characteristics of high efficiency, energy conservation and emission reduction.
Description
Technical Field
The invention relates to a method for electrolytic refining of coarse soldering tin, and belongs to the technical field of wet metallurgy.
Background
Fine solder is used in the fields of electric appliances, glass, catalysts, solders, etc. due to its special physical and chemical properties, and is refined from coarse solder. The refining of the crude soldering tin mainly adopts fire refining and electrolytic refining, wherein the fire refining has the defects of high energy consumption, large environmental pollution and the like, and the electrolytic refining has the advantages of high direct recovery rate of tin, easy recovery of valuable metals, low energy consumption and the like compared with the electrolytic refining.
The electrolyte adopted by the crude soldering tin electrolytic refining mainly comprises acid electrolyte and alkaline electrolyte, becauseThe acidic electrolyte is more stable and has lower production cost, so the acidic electrolyte is widely applied to production. At present, the silicofluoric acid solution is mainly adopted for electrolytic refining, but the silicofluoric acid is easy to volatilize, a large amount of acid mist can be generated on a working site, and the smell is foul and unpleasant; the silicofluoric acid can also decompose and separate out HF and SiF4Gas, which is very harmful to human body and environment; the energy consumption is high; low production efficiency, long production period, large capital backlog and the like.
Disclosure of Invention
In view of the problems and deficiencies of the prior art, the present invention provides a method for electrorefining solder preform. The invention adopts cleaner electrolyte and carries out electrolytic refining by matching with the specific electrolytic process of the invention, and has the characteristics of high efficiency, energy conservation and emission reduction. The invention is realized by the following technical scheme.
A method for refining rough soldering tin by electrolysis comprises the following specific steps:
the crude soldering tin is used as an anode plate, the stainless steel is used as a cathode plate, and the concentration of the main component is 50-150g/L, Sn g/g of methanesulfonic acid2++Pb2+Controlling the cathode current density of 125-250A/m in the electrolyte with the concentration of 30-160g/L and the total additive amount of 0.8-3g/L2The distance between the electrodes is 25-100mm, the temperature of the electrolyte is 20-50 ℃, the cathode discharging period is 4-7d, and the refined soldering tin and the anode mud are obtained through electrolytic refining.
The mass percentage of the main component of the crude soldering tin is (wt%) is: 41 to 80 percent of Sn, 15 to 40 percent of Pb and other small impurities.
The additive is alkyl naphthalene sulfonate.
The invention has the beneficial effects that:
the invention is environment-friendly, and avoids the serious pollution of toxic and harmful gas and acid mist generated by the electrolysis of a silicofluoric acid solution system to the environment and the serious harm to human bodies; low energy consumption, when the cathode current density is 125-250A/m2When the voltage of the cell is 0.1-0.35V; current efficiency>98 percent; the invention adopts cleaner electrolyte and carries out electrolytic refining by matching with the specific electrolytic process of the invention, and has the characteristics of high efficiency, energy conservation and emission reduction.
Detailed Description
The present invention will be further described with reference to the following embodiments.
Example 1
The method for refining the crude soldering tin by electrolysis comprises the following specific steps:
coarse soldering tin (mass percent of main component: (wt%) is: 41% Sn, 30% Pb and other small impurities) as an anode plate and stainless steel as a cathode plate, and the concentration of the main component is 60g/L, Sn g/g of methanesulfonic acid2++Pb2+Controlling the cathode current density to 125A/m in the electrolyte with the concentration of 30g/L and the total amount of the additive alkyl naphthalene sulfonate to be 3g/L2The electrode spacing is 25mm, the temperature of the electrolyte is 30 ℃, the cathode discharging period is 4d, and refined soldering tin (the mass percentage of the main components: Sn: 60.1%, the balance being lead and other trace impurities) and anode mud are obtained through electrolytic refining.
In this example, the cell voltage is 0.18V and the current efficiency is 98.71%.
Example 2
The method for refining the crude soldering tin by electrolysis comprises the following specific steps:
coarse soldering tin (mass percent of main component: (wt%) is: 80% Sn, 15% Pb and other small impurities) as an anode plate and stainless steel as a cathode plate, wherein the concentration of the main component is 150g/L, Sn g/g of methanesulfonic acid2++Pb2+Controlling the cathode current density to be 150A/m in the electrolyte with the concentration of 80g/L and the total amount of the additive alkyl naphthalene sulfonate to be 0.8g/L2The electrode spacing is 60mm, the temperature of the electrolyte is 20 ℃, the cathode discharging period is 7d, and refined soldering tin (the mass percentage of the main components: Sn: 90.4%, the balance being lead and other trace impurities) and anode mud are obtained through electrolytic refining.
In this example, the cell voltage is 0.10V and the current efficiency is 99.12%.
Example 3
The method for refining the crude soldering tin by electrolysis comprises the following specific steps:
coarse soldering tin (mass percent of main component: (wt%) is: sn 52%, Pb 40% and other small impurities) as an anode plate, stainless steel as a cathode plate, and a concentration of 50g/L, Sn of methanesulfonic acid as a main component2++Pb2+Concentration 160gControlling the cathode current density to be 250A/m in the electrolyte consisting of/L and 2.1g/L of the total amount of the additive alkyl naphthalene sulfonate2The electrode spacing is 100mm, the temperature of the electrolyte is 50 ℃, the cathode discharging period is 5d, and refined soldering tin (the mass percentage of the main components: Sn: 59.3%, the balance being lead and other trace impurities) and anode mud are obtained through electrolytic refining.
In this example, the cell voltage is 0.35V and the current efficiency is 98.36%.
While the present invention has been described in detail with reference to the specific embodiments thereof, the present invention is not limited to the embodiments described above, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (3)
1. A method for electrolytic refining of crude soldering tin is characterized by comprising the following specific steps:
the crude soldering tin is used as an anode plate, the stainless steel is used as a cathode plate, and the concentration of the main component is 50-150g/L, Sn g/g of methanesulfonic acid2++Pb2+Controlling the cathode current density of 125-250A/m in the electrolyte with the concentration of 30-160g/L and the total additive amount of 0.8-3g/L2The distance between the electrodes is 25-100mm, the temperature of the electrolyte is 20-50 ℃, the cathode discharging period is 4-7d, and the refined soldering tin and the anode mud are obtained through electrolytic refining.
2. The method for electrorefining solder preforms as set forth in claim 1, wherein: the mass percentages of the main components of the crude soldering tin are as follows: 41 to 80 percent of Sn, 15 to 40 percent of Pb and other small impurities.
3. The method for electrorefining solder preforms as set forth in claim 1, wherein: the additive is alkyl naphthalene sulfonate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110272888.4A CN112981459A (en) | 2021-03-12 | 2021-03-12 | Method for electrolytic refining of coarse soldering tin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110272888.4A CN112981459A (en) | 2021-03-12 | 2021-03-12 | Method for electrolytic refining of coarse soldering tin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112981459A true CN112981459A (en) | 2021-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110272888.4A Pending CN112981459A (en) | 2021-03-12 | 2021-03-12 | Method for electrolytic refining of coarse soldering tin |
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| Country | Link |
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| CN (1) | CN112981459A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104746098A (en) * | 2015-03-24 | 2015-07-01 | 昆明理工大学 | Electrolyte and method for electrolyzing and refining crude lead |
| CN109338408A (en) * | 2018-12-04 | 2019-02-15 | 中华全国供销合作总社天津再生资源研究所 | A kind of electrolyte and a kind of electrorefining method of useless electronic solder |
| CN110050089A (en) * | 2016-12-19 | 2019-07-23 | 威立雅环境公司 | For extract include tin and/or lead in conductive mixture electrolytic method |
| CN110249076A (en) * | 2017-01-31 | 2019-09-17 | 三菱综合材料株式会社 | Tin alloy plating solution |
-
2021
- 2021-03-12 CN CN202110272888.4A patent/CN112981459A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104746098A (en) * | 2015-03-24 | 2015-07-01 | 昆明理工大学 | Electrolyte and method for electrolyzing and refining crude lead |
| CN110050089A (en) * | 2016-12-19 | 2019-07-23 | 威立雅环境公司 | For extract include tin and/or lead in conductive mixture electrolytic method |
| JP2020514537A (en) * | 2016-12-19 | 2020-05-21 | ヴェオリア エンバイロメント−ブイイー | Electrolytic method for extracting tin and / or lead contained in an electrically conductive mixture |
| CN110249076A (en) * | 2017-01-31 | 2019-09-17 | 三菱综合材料株式会社 | Tin alloy plating solution |
| CN109338408A (en) * | 2018-12-04 | 2019-02-15 | 中华全国供销合作总社天津再生资源研究所 | A kind of electrolyte and a kind of electrorefining method of useless electronic solder |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210618 |
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