CN103602987A - Environment-friendly detinning liquor for waste circuit boards - Google Patents
Environment-friendly detinning liquor for waste circuit boards Download PDFInfo
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- CN103602987A CN103602987A CN201310657568.6A CN201310657568A CN103602987A CN 103602987 A CN103602987 A CN 103602987A CN 201310657568 A CN201310657568 A CN 201310657568A CN 103602987 A CN103602987 A CN 103602987A
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- nitric acid
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Abstract
The invention relates to an environment-friendly detinning liquor for waste circuit boards, which is prepared from the following raw materials in percentage by weight: 75-85% of water, 10-18% of nitric acid, 3-5% of methyl benzotriazole, 0.8-1.2% of sodium mercaptobenzothiazole and 0.8-1.2% of sulfamic acid. The environment-friendly detinning liquor can dissolve and remove all tin on the immersed waste circuit borads, so that the components are separated from the circuit boards. By using the nitric acid as the detinning agent and the methyl benzotriazole and sodium mercaptobenzothiazole as the corrosion inhibitors, the nitric acid and sulfamic acid can effectively clean scales and corrosion products on the waste circuit boards and components thereof, and effectively prevent the waste circuit boards and components thereof from the influence of nitric acid to cause damage or dissolution of surface metals; and the liquor only dissolves and separates the metallic tin, thereby ensuring that the components from the waste circuit boards can be reutilized, and enhancing the recycling value of the metallic tin.
Description
Technical field
The present invention relates to chemical preparations technical field, is a kind of for cleaning on waste and old circuit board the liquid for detin specifically.
Background technology
Expanding economy and scientific and technological progress make electronic industry fast development, have brought deep change to the mankind's production, mode of life.The update cycle due to electronic product constantly shortens simultaneously, a large amount of electronic products is scrapped after reaching work-ing life becomes electron wastes, consequent electron wastes with 18% speed increment, becomes one of fastest-rising rubbish in the world every year.Waste and old circuit board be in electron wastes composition and structure the most complicated, be also the most unmanageable parts simultaneously, if do not add processings, arbitrarily stacking or landfill or deal with improperly will to around environment bring very large threat; In addition, China, just at Developing Circulation Economy, advocates and sets up conservation-minded society, the immense pressure of social sustainable development being brought to alleviate population, resource, environment.The comprehensive treating process of waste and old circuit board and recycling have become an important topic in resource environment field.
In waste and old circuit board, contain a large amount of resources such as available plastics, glass, metal and rare precious metal, if arbitrarily dispose waste and old circuit board, not only can bring potential harm to environment, and can cause the significant wastage of resource.
Also having many patent documentations adopts detin water auxiliary agent to carry out detin to the tin point on plate to waste and old circuit board components and parts are departed from from circuit card, reach the recycle of components and parts is worth, but the detin water auxiliary agent of the type is more serious to components and parts damage or corrosion condition in detin process, affect the secondary use value of components and parts, and detin water auxiliary agent in use can affect other metals of waste and old circuit board (as metallic copper, lead etc.) dissolving, the metallic tin impurity coming off is obviously increased, and the withdrawal that affects metallic tin is used.
Summary of the invention
The object of the invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of can not damage or corrosion condition components and parts in to waste and old circuit board detin process, and detin liquid that can be to other dissolving metals of circuit card, this detin liquid is after being used, also can not pollute environmental health, highlight the advantage of environmental protection.
The present invention can be achieved through the following technical solutions:
The invention discloses a kind of environmental protection detin liquid being used on waste and old circuit board, the raw material that described environmental protection detin liquid includes following weight percent forms:
Water 75%～85% nitric acid 10%～18% tolyltriazole 3%～5%
Mercapto benzothiazole sodium 0.8%～1.2% thionamic acid 0.8%～1.2%.
In the raw material of above-mentioned composition, the optimum weight per-cent of environmental protection detin liquid is as follows:
Water 80% nitric acid 15% tolyltriazole 3%
Mercapto benzothiazole sodium 1% thionamic acid 1%.
In the raw material of above-mentioned composition, the concentration of described nitric acid is 90～95%.
Nitric acid (nitric acid) molecular formula HNO3, is a kind of mineral acid that has strong oxidizing property, severe corrosive, and acid anhydrides is nitrogen pentoxide.The acidity of nitric acid is compared with sulfuric acid and hydrochloric acid little (PKa=-1.3), soluble in water, ionization completely in water, and its dilute solution water white transparency under normal temperature, strong solution water white transparency, but concentrated nitric acid easily decomposes generation nitrogen peroxide, and aobvious brown under normal temperature.Nitric acid is one of most important basic chemical raw materials, is the Chemicals that a kind of purposes is extremely wide, can be used as and cleans rust remover use.
Tolyltriazole, is called for short TTA, and molecular formula is C7H7N3; be white in color particle or powder, be the mixture of 4-tolyltriazole and 5-tolyltriazole, fusing point 80-86 ℃; be insoluble in water, be dissolved in the organic solvents such as alcohol, benzene, toluene, chloroform, dissolve in sig water.Easily moisture absorption, is mainly rust-preventive agent and the inhibiter of metal (as silver, copper, lead, nickel, zinc etc.), and in the detin process of waste and old circuit board, effective holding circuit plate and components and parts thereof can not corroded rapidly by nitric acid.
Mercapto benzothiazole sodium is called for short MBT Na, also claim sodium salt of 2-mercaptobenzothiazole, it is the troubled liquor that has distinctive odor, the solution of water, alcohols furnishing, can make the inhibiter of iron and steel, copper, aluminum products, MBT Na corrosion inhibition mainly rely on copper surface on active copper atom or cupric ion there is a kind of chemisorption; Thereby or and then there is sequestering action and form the fine and close and protective membrane firmly of one deck.In the detin process of waste and old circuit board, effectively the Copper Foil of holding circuit plate forms protective membrane and can not corroded rapidly by nitric acid.
Thionamic acid, is colourless or white crystals, water-soluble, is slightly soluble in ethanol and methyl alcohol, is slightly soluble in acetone, is insoluble to ether. in the aqueous solution, resolve into gradually monoammonium sulfate, solubleness in water: 146.8 g/l (20 ℃).The aqueous solution of thionamic acid has the strongly-acid equal with hydrochloric acid, sulfuric acid etc., therefore another name is again solid sulphuric acid, it has non-volatile, odorless and the feature minimum to human toxicity.The thionamic acid aqueous solution is slower to the corrosion product effect of iron, can add some sodium-chlor, makes it slowly to produce hydrochloric acid, thereby dissolved iron is dirty effectively.The thionamic acid aqueous solution can be removed the water scale and corrosion product of the equipment surface of the material manufactures such as iron, steel, copper, stainless steel.And it can be used as the acid that galvanized metal surfaces cleans.
The present invention compared with prior art has the following advantages:
Liquid of the present invention be by said ratio material dissolution in water, in being mounted with the container of this liquid, waste and old circuit board is soaked to 1-2 days, get final product so that the tin of waste and old circuit board all dissolves and comes off, shake waste and old circuit board can depart from components and parts from circuit card, because the present invention adopts nitric acid as detin agent, adopt tolyltriazole and mercapto benzothiazole sodium as inhibiter simultaneously, make nitric acid, thionamic acid can effectively clean the water scale and corrosion product of waste and old circuit board and components and parts thereof, and effectively guaranteed old circuit card and components and parts thereof can not be subject to the impact of nitric acid and damage or its surperficial metal object is dissolved, liquid of the present invention is dissolved metallic tin and separation only, guaranteed that components and parts that waste and old circuit board splits away off can realize secondary and use, and the metallic tin impurity coming off is reduced, improve the withdrawal utility value of metallic tin, this detin liquid is after being used, also can not pollute environmental health, highlight the advantage of environmental protection, it is skillfully constructed, applied range, be applicable to generally promoting the use of.
Embodiment
Below the invention will be further described:
Embodiment mono-:
The present embodiment discloses and the invention discloses a kind of environmental protection detin liquid being used on waste and old circuit board, and the raw material that described environmental protection detin liquid includes following weight percent forms:
Water 80% nitric acid 15% tolyltriazole 3%
Mercapto benzothiazole sodium 1% thionamic acid 1%.
In the raw material of above-mentioned composition, the concentration of described nitric acid is 93%.
Liquid of the present invention be by said ratio material dissolution in water, in being mounted with the container of this liquid, by waste and old circuit board soak at room temperature 2 days, get final product so that the tin of waste and old circuit board all dissolves and comes off, shake waste and old circuit board can depart from components and parts from circuit card, because the present invention adopts nitric acid as detin agent, adopt tolyltriazole and mercapto benzothiazole sodium as inhibiter simultaneously, make nitric acid, thionamic acid can effectively clean the water scale and corrosion product of waste and old circuit board and components and parts thereof, and effectively guaranteed old circuit card and components and parts thereof can not be subject to the impact of nitric acid and damage or its surperficial metal object is dissolved.The metallic tin purity coming off is very high, recycles value very high.
Embodiment bis-:
The present embodiment discloses and the invention discloses a kind of environmental protection detin liquid being used on waste and old circuit board, and the raw material that described environmental protection detin liquid includes following weight percent forms:
Water 85% nitric acid 10% tolyltriazole 3.4%
Mercapto benzothiazole sodium 0.8% thionamic acid 0.8%.
In the raw material of above-mentioned composition, the concentration of described nitric acid is 95%.
Liquid of the present invention be by said ratio material dissolution in water, in being mounted with the container of this liquid, by waste and old circuit board soak at room temperature 2 days, get final product so that the tin of waste and old circuit board all dissolves and substantially comes off, shake waste and old circuit board can depart from components and parts from circuit card, because the present invention adopts nitric acid as detin agent, adopt tolyltriazole and mercapto benzothiazole sodium as inhibiter simultaneously, make nitric acid, thionamic acid can effectively clean the water scale and corrosion product of waste and old circuit board and components and parts thereof, and effectively guaranteed old circuit card and components and parts thereof can not be subject to the impact of nitric acid and damage or its surperficial metal object is dissolved.The metallic tin purity coming off is higher, recycles value very high.
Embodiment tri-:
The present embodiment discloses and the invention discloses a kind of environmental protection detin liquid being used on waste and old circuit board, and the raw material that described detin liquid includes following weight percent forms:
Water 75% nitric acid 18% tolyltriazole 5%
Mercapto benzothiazole sodium 0.8% thionamic acid 1.2%.
In the raw material of above-mentioned composition, the concentration of described nitric acid is 90%.
Liquid of the present invention be by said ratio material dissolution in water, in being mounted with the container of this liquid, by waste and old circuit board soak at room temperature 1 day, get final product so that the tin of waste and old circuit board all dissolves and comes off completely, shake waste and old circuit board can depart from components and parts from circuit card, because the present invention adopts nitric acid as detin agent, adopt tolyltriazole and mercapto benzothiazole sodium as inhibiter simultaneously, make nitric acid, thionamic acid can effectively clean the water scale and corrosion product of waste and old circuit board and components and parts thereof, and effectively guaranteed old circuit card and components and parts thereof can not be subject to the impact of nitric acid and damage or its surperficial metal object is dissolved.The metallic tin purity coming off is very high, recycles value high.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction; The those of ordinary skill of all industry all can by specification described in and implement swimmingly the present invention; But all those skilled in the art are not departing within the scope of technical solution of the present invention, can utilize disclosed above technology contents and a little change, the modification of making and the equivalent variations developing, be equivalent embodiment of the present invention; Meanwhile, the change of any equivalent variations that all foundations essence technology of the present invention is done above embodiment, modification and differentiation etc., within all still belonging to the protection domain of technical scheme of the present invention.
Claims (3)
1. be used in the environmental protection detin liquid on waste and old circuit board, it is characterized in that: the raw material that described environmental protection detin liquid includes following weight percent forms:
Water 75%～85% nitric acid 10%～18% tolyltriazole 3%～5%
Mercapto benzothiazole sodium 0.8%～1.2% thionamic acid 0.8%～1.2%.
2. be used according to claim 1 the environmental protection detin liquid on waste and old circuit board, it is characterized in that: the weight percent of described environmental protection detin liquid is as follows:
Water 80% nitric acid 15% tolyltriazole 3%
Mercapto benzothiazole sodium 1% thionamic acid 1%.
3. according to the environmental protection detin liquid being used in described in claim 1 or 2 on waste and old circuit board, it is characterized in that: the concentration of described nitric acid is 90～95%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310657568.6A CN103602987B (en) | 2013-07-29 | 2013-12-09 | Environment-friendly detinning liquor for waste circuit boards |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310321632.3 | 2013-07-29 | ||
| CN2013103216323 | 2013-07-29 | ||
| CN201310321632 | 2013-07-29 | ||
| CN201310657568.6A CN103602987B (en) | 2013-07-29 | 2013-12-09 | Environment-friendly detinning liquor for waste circuit boards |
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| CN103602987A true CN103602987A (en) | 2014-02-26 |
| CN103602987B CN103602987B (en) | 2017-01-25 |
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| CN201310657568.6A Active CN103602987B (en) | 2013-07-29 | 2013-12-09 | Environment-friendly detinning liquor for waste circuit boards |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107034363A (en) * | 2017-04-28 | 2017-08-11 | 西北有色金属研究院 | A kind of method for reclaiming goldleaf quick from stanniferous gold-plated electronic waste |
| TWI616560B (en) * | 2017-07-17 | 2018-03-01 | 中國鋼鐵股份有限公司 | Pickling solution, use and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101760743A (en) * | 2009-11-09 | 2010-06-30 | 广东奥美特集团有限公司 | Tin stripping liquid |
| CN101962776A (en) * | 2010-09-01 | 2011-02-02 | 济南德锡科技有限公司 | Solder stripping agent and preparation method thereof |
| CN102925905A (en) * | 2012-12-03 | 2013-02-13 | 中昊(大连)化工研究设计院有限公司 | Acid-washing corrosion inhibitor for copper and alloy device |
-
2013
- 2013-12-09 CN CN201310657568.6A patent/CN103602987B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101760743A (en) * | 2009-11-09 | 2010-06-30 | 广东奥美特集团有限公司 | Tin stripping liquid |
| CN101962776A (en) * | 2010-09-01 | 2011-02-02 | 济南德锡科技有限公司 | Solder stripping agent and preparation method thereof |
| CN102925905A (en) * | 2012-12-03 | 2013-02-13 | 中昊(大连)化工研究设计院有限公司 | Acid-washing corrosion inhibitor for copper and alloy device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105714298B (en) * | 2016-03-23 | 2019-01-29 | 广东利尔化学有限公司 | It is a kind of based on sulfuric acid-molysite system etching agent and preparation method thereof |
| CN107034363A (en) * | 2017-04-28 | 2017-08-11 | 西北有色金属研究院 | A kind of method for reclaiming goldleaf quick from stanniferous gold-plated electronic waste |
| CN107034363B (en) * | 2017-04-28 | 2019-03-19 | 西北有色金属研究院 | A method of goldleaf is quickly recycled from stanniferous gold-plated electronic waste |
| TWI616560B (en) * | 2017-07-17 | 2018-03-01 | 中國鋼鐵股份有限公司 | Pickling solution, use and preparation method thereof |
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| CN103602987B (en) | 2017-01-25 |
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| ASS | Succession or assignment of patent right |
Owner name: MEIZHOU HONGXIN ENVIRONMENTAL PROTECTION TECHNOLOG Free format text: FORMER OWNER: LI MINHUI Effective date: 20150217 |
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Effective date of registration: 20150217 Address after: 514700, Huangmei village, Meizhou Town, Meixian District, Guangdong province (WAN FA Chemical Co., Ltd.) Applicant after: Meizhou City Hong Xin Environmental Protection Technology Co., Ltd Address before: 514700, Guangdong, Meizhou, Meixian Province town and town people and the management of the East Gate Applicant before: Li Minhui |
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