JPH0711468A - Method for removing coating film of can scrap and method for removing tin - Google Patents
Method for removing coating film of can scrap and method for removing tinInfo
- Publication number
- JPH0711468A JPH0711468A JP21686293A JP21686293A JPH0711468A JP H0711468 A JPH0711468 A JP H0711468A JP 21686293 A JP21686293 A JP 21686293A JP 21686293 A JP21686293 A JP 21686293A JP H0711468 A JPH0711468 A JP H0711468A
- Authority
- JP
- Japan
- Prior art keywords
- tin
- coating film
- detinning
- iron
- leaching
- 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.)
- Withdrawn
Links
Classifications
-
- 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
- C23F1/44—Compositions for etching metallic material from a metallic material substrate of different composition
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、缶屑から鉄と錫を資源
としてリサイクルするため、メッキ部分の錫を高効率で
除去する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for highly efficiently removing tin in a plated portion in order to recycle iron and tin from can waste as resources.
【０００２】[0002]
【従来の技術】スチール缶などのブリキ廃材からメッキ
部分の錫を分離し、鉄と錫を回収する方法が例えば特開
昭５６−７５５８６号公報に示されている。この方法で
は、錫と鉄が分離するまでに缶屑の破砕工程と塗膜分離
工程が含まれている。塗装被膜は、缶屑の破砕工程にお
いて破砕時の衝撃により剥離することとされている。2. Description of the Related Art A method of separating tin in a plated portion from a waste tin material such as a steel can and recovering iron and tin is disclosed in, for example, Japanese Patent Application Laid-Open No. 56-75586. In this method, a crushing process of cans and a coating film separating process are included before tin and iron are separated. The coating film is supposed to be peeled off by the impact at the time of crushing in the crushing process of can waste.
【０００３】錫メッキ材からメッキ部分の錫を除去する
方法としては、例えば特開昭５５−１３８０９１号公報
に示されている電解脱錫法、特開昭６３−１５７８２１
号公報に示されている塩化鉄脱錫法、欧米で操業されて
いるアルカリ脱錫法（Ａ ｍｉｎｉｎｇ ｒｅｓｅａｒ
ｃｈ ｃｏｎｔｒａｃｔ ｒｅｐｏｒｔ（１９８３））
がある。As a method of removing tin in a plated portion from a tin-plated material, for example, an electrolytic detinning method disclosed in JP-A-55-138091 and JP-A-63-157821.
Iron tin detining method disclosed in Japanese Patent Publication No. JP-A No. 2004-242242, and alkaline detining method (Amining resea) operating in Europe and America.
ch contract report (1983))
There is.
【０００４】特開昭５５−１３８０９１号公報に示され
ている電解脱錫法は、アルカリ溶液中に錫メッキ廃材を
陽極に配置してメッキ部分の錫を浸出させ、陰極には錫
の地金を配置して錫を電析させ、回収する方法である。In the electrolytic detinning method disclosed in Japanese Patent Application Laid-Open No. 55-138091, a waste tin-plating material is placed in an alkaline solution as an anode to leaching tin in a plated portion, and a cathode is made of tin metal. Is a method of arranging and electrodepositing tin to collect it.
【０００５】特開昭６３−１５７８２１号公報に示され
ている塩化鉄脱錫法は、塩化第二鉄の浸出力を利用して
数分内で錫を浸出させる方法である。The iron chloride detinning method disclosed in JP-A-63-157821 is a method of leaching tin within a few minutes by utilizing the leaching power of ferric chloride.
【０００６】Ａ ｍｉｎｉｎｇ ｒｅｓｅａｒｃｈ ｃ
ｏｎｔｒａｃｔ ｒｅｐｏｒｔ（１９８３）に示されて
いるアルカリ脱錫法は、アルカリ溶液中に錫は浸出する
が、鉄は不働態化してほとんど浸出しないことを利用し
たものである。さらに、錫浸出を促進するために硝酸ナ
トリウム等の酸化剤が用いられる。A mining research c
The alkaline detinning method shown in the on-trace report (1983) utilizes that tin is leached in an alkaline solution, but iron is passivated and hardly leached. Further, an oxidizing agent such as sodium nitrate is used to promote tin leaching.
【０００７】[0007]
【発明が解決しようとする課題】塗膜除去に関しては、
特開昭５６−７５５８６号公報に示されているような缶
屑破砕時の摩耗、衝撃だけでは塗膜剥離は不十分であ
る。塗膜が一部残留したまま脱錫操作を行うと、この塗
膜の存在が脱錫の律速となり、脱錫処理時間を規定して
いれば、除去できずに残留する錫の量を多くするという
問題が生じる。Regarding the removal of the coating film,
Peeling of the coating film is not sufficient only by abrasion and impact when crushing cans as disclosed in JP-A-56-75586. When the tin removal operation is performed with a part of the coating film remaining, the presence of this coating film determines the rate of tin removal, and if the tin removal treatment time is specified, the amount of tin remaining that cannot be removed increases. The problem arises.
【０００８】脱錫法に関しては、Ａ ｍｉｎｉｎｇ ｒ
ｅｓｅａｒｃｈ ｃｏｎｔｒａｃｔｒｅｐｏｒｔ（１９
８３）に示されているアルカリ脱錫法と特開昭５５−１
３８０９１号公報に示されている電解脱錫法の場合、脱
錫処理時間が１．５〜５時間程度かかり、効率が非常に
悪い。また、特開昭６３−１５７８２１号公報に示され
ている塩化第二鉄法では錫浸出は数分で完了するが、同
時に鉄も浸出するので十分な固体分の鉄回収ができず、
また、浸出液中からの錫回収にも手間を要することにな
る。Regarding the detinning method, A mining r
essearch contractreport (19
83) and the alkaline detinization method described in JP-A-55-1.
In the case of the electrolytic detinning method disclosed in Japanese Patent No. 38091, the tin removal treatment time is about 1.5 to 5 hours, and the efficiency is very poor. Further, in the ferric chloride method disclosed in Japanese Patent Laid-Open No. 63-157821, tin leaching is completed in a few minutes, but at the same time, iron is also leached, so that sufficient solid iron cannot be recovered.
Further, it takes time and effort to recover tin from the leachate.
【０００９】本発明は、缶屑裁断の後塗膜を完全に除去
し、錫浸出の浸出速度向上と錫浸出の選択性向上とを同
時に解決する脱錫法を提供することを目的とする。It is an object of the present invention to provide a detinning method in which the coating film is completely removed after the cutting of can waste and the improvement of the tin leaching rate and the improvement of the tin leaching selectivity are solved at the same time.
【００１０】[0010]
【課題を解決するための手段】本発明の要旨は以下の通
りである。The gist of the present invention is as follows.
【００１１】 缶屑を破砕機で５ｍｍ×５ｍｍ〜５０
ｍｍ×５０ｍｍのチップ状にし、磁力選別機にかけて非
鉄分を除去した後、７０〜９５℃の４０〜３３０ｇ／ｌ
水酸化ナトリウム水溶液中で超音波洗浄することを特徴
とする缶屑の塗膜除去方法。5 mm × 5 mm to 50 mm with a crusher
After making it into a chip of mm × 50 mm and removing the non-ferrous component by applying a magnetic separator, 40-330 g / l at 70-95 ° C.
A method for removing a coating film from waste cans, which comprises performing ultrasonic cleaning in an aqueous sodium hydroxide solution.
【００１２】 温度１０〜９５℃の４０〜３３０ｇ／
ｌ水酸化ナトリウムと５〜３０ｇ／ｌペルオキソ二硫酸
カリウムとからなる混合水溶液中で脱錫処理することを
特徴とする缶屑の脱錫方法。40-330 g / of temperature 10-95 degrees Celsius
A method for detinning tin waste, comprising detinning in a mixed aqueous solution of 1-sodium hydroxide and 5-30 g / l potassium peroxodisulfate.
【００１３】 前記の缶屑の塗膜除去方法を実施し
た後、前記の脱錫方法を実施することを特徴とする缶
屑の脱錫方法。A method for detinning tin waste, comprising carrying out the above tin removal method after carrying out the method for removing a coating film for can waste.
【００１４】[0014]
【作用】本発明は、缶屑を温度７０〜９５℃の４０〜３
３０ｇ／ｌ水酸化ナトリウム（ＮａＯＨ）水溶液中で超
音波洗浄することにより缶屑の塗膜を完全に剥離する。
次いで、温度１０〜９５℃の４０〜３３０ｇ／ｌ水酸化
ナトリウム（ＮａＯＨ）と５〜３０ｇ／ｌペルオキソ二
硫酸カリウム（Ｋ2 Ｓ2 Ｏ8 ）とからなる混合溶液中で
脱錫処理することにより、ペルオキソ二硫酸カリウムの
酸化剤としての作用とアルカリ浴中での鉄の不働体化の
作用とを利用し、錫浸出の浸出速度と錫浸出の選択性と
を同時に高めることができる。According to the present invention, the waste is treated at 40 to 3 at a temperature of 70 to 95 ° C.
The coating film of the can waste is completely removed by ultrasonic cleaning in a 30 g / l sodium hydroxide (NaOH) aqueous solution.
Then, a tin removal treatment is performed in a mixed solution of 40 to 330 g / l sodium hydroxide (NaOH) and 5 to 30 g / l potassium peroxodisulfate (K 2 S 2 O 8 ) at a temperature of 10 to 95 ° C. By utilizing the action of potassium peroxodisulfate as an oxidizing agent and the action of passivation of iron in an alkaline bath, the leaching rate of tin leaching and the selectivity of tin leaching can be simultaneously enhanced.
【００１５】図１に本発明方法のフローの例を示す。缶
屑は破砕機により搬送と脱錫処理とに有利な形状をした
５ｍｍ×５ｍｍ〜５０ｍｍ×５０ｍｍ、望ましくは２５
〜１００ｍｍ2 のチップ状に裁断される。チップの大き
さは小さいほど塗膜剥離に有利であり、５０ｍｍ×５０
ｍｍより大きくなると塗膜剥離に時間がかかり適切でな
い。また、５ｍｍ×５ｍｍより小さくなると溶液からの
缶屑の分離と搬送の点で困難が生じるので適切でない。
次に磁力選別機により非鉄分、特にアルミニウムを十分
に取り除く。アルミニウムは次工程で使用される水酸化
ナトリウム水溶液と激しく反応して水素ガスを発生する
ので、アルミニウムの残留は危険である。FIG. 1 shows an example of the flow of the method of the present invention. The waste is 5 mm × 5 mm to 50 mm × 50 mm, preferably 25 mm, which has a shape advantageous for carrying and destining by a crusher.
It is cut into chips of -100 mm 2 . The smaller the chip size is, the more advantageous it is for peeling off the coating film.
If it is larger than mm, it takes time to peel off the coating film, which is not suitable. Further, if it is smaller than 5 mm × 5 mm, it is difficult to separate the can waste from the solution and convey it, which is not suitable.
Next, a magnetic separator is used to sufficiently remove non-ferrous components, especially aluminum. Aluminum remains dangerous because aluminum reacts violently with the aqueous sodium hydroxide solution used in the next step to generate hydrogen gas.
【００１６】本発明の塗膜除去法では、アルカリ溶液中
での加水分解反応により缶のプリントおよび有機塗膜が
侵されることを利用する。通常のアルカリ脱錫法におい
ても前記塗膜がアルカリに侵され、徐々に剥離していく
が、本発明では前記塗膜を金属表面から短時間で完全に
脱離させるため、脱錫処理工程と塗膜除去工程とを分離
し、ＮａＯＨ水溶液中で超音波洗浄する。すなわち、Ｎ
ａＯＨ水溶液の温度を７０〜９５℃、濃度を４０〜３３
０ｇ／ｌに設定し、攪拌しながら缶屑を超音波洗浄す
る。The method of removing the coating film of the present invention utilizes the fact that the can print and the organic coating film are attacked by the hydrolysis reaction in the alkaline solution. Even in the usual alkaline detinning method, the coating film is gradually peeled off by being attacked by alkali, but in the present invention, the coating film is completely desorbed from the metal surface in a short time. Separated from the coating film removing step, ultrasonic cleaning is performed in a NaOH aqueous solution. That is, N
The temperature of the aOH aqueous solution is 70 to 95 ° C, and the concentration is 40 to 33.
Set to 0 g / l and ultrasonically clean the can waste with stirring.
【００１７】この塗膜剥離はＮａＯＨ水溶液の温度の影
響を受け、温度が高いほど速い。しかし、蒸発による顕
著な液量の減少を避けるため、上限を９５℃に設定す
る。また、温度が低くなると塗膜剥離が遅くなるので、
下限を７０℃とする。濃度は４０〜３３０ｇ／ｌが適当
であり、４０ｇ／ｌ未満では塗膜剥離が遅くなり、３３
０ｇ／ｌ超では塗膜剥離速度の上昇はほとんどない。超
音波洗浄による塗膜剥離は、超音波洗浄を用いない場合
に比べて処理時間が半分になるため、超音波洗浄が必要
である。運転条件は、５０ｋＨｚの超音波を用い、１ｌ
あたり５０Ｗの発信源を用いるのが望ましい。The peeling of the coating film is affected by the temperature of the aqueous NaOH solution, and the higher the temperature, the faster the peeling. However, the upper limit is set to 95 ° C. in order to avoid a significant decrease in the amount of liquid due to evaporation. Also, since the peeling of the coating film becomes slower when the temperature becomes lower,
The lower limit is 70 ° C. A concentration of 40 to 330 g / l is suitable, and if it is less than 40 g / l, the peeling of the coating film will be delayed.
If it exceeds 0 g / l, the peeling speed of the coating film hardly increases. The peeling of the coating film by ultrasonic cleaning requires half the processing time as compared with the case where ultrasonic cleaning is not used. The operating condition is 1 liter using ultrasonic waves of 50 kHz.
It is desirable to use a source of 50 W each.
【００１８】塗膜除去後の本発明の脱錫法は、基本的に
はアルカリ脱錫法であるが、本発明では酸化剤としてペ
ルオキソ二硫酸カリウム（Ｋ2 Ｓ2 Ｏ8 ）を用いること
を特徴とする。アルカリ溶液中であるから鉄の浸出はほ
とんどなく、しかもＫ2 Ｓ2Ｏ8 の浸出力によって錫浸
出が促進される。脱錫溶液は４０〜３３０ｇ／ｌＮａＯ
Ｈ、５〜３０ｇ／ｌＫ2 Ｓ2 Ｏ8 の水溶液である。ま
た、脱錫処理温度は１０〜９５℃に設定する。The detinning method of the present invention after removing the coating film is basically an alkaline detinning method, but in the present invention, potassium peroxodisulfate (K 2 S 2 O 8 ) is used as an oxidizing agent. Characterize. Since it is in an alkaline solution, there is almost no leaching of iron, and the leaching output of K 2 S 2 O 8 promotes tin leaching. Detinization solution is 40-330g / l NaO
H, is an aqueous solution of 5~30g / lK 2 S 2 O 8 . The detinning treatment temperature is set to 10 to 95 ° C.
【００１９】この溶液中では鉄はほとんど浸出せず、し
かも錫の浸出速度は従来法のアルカリ脱錫法より速い。
ＮａＯＨの濃度が４０ｇ／ｌ未満、Ｋ2 Ｓ2 Ｏ8 の濃度
が５ｇ／ｌ未満になると錫浸出速度が低下し、短時間で
脱錫ができなくなる。逆にＮａＯＨ濃度が３３０ｇ／ｌ
超、Ｋ2 Ｓ2 Ｏ8 の濃度が３０ｇ／ｌ超となっても錫浸
出速度はそれほど速くならず、むしろペルオキソ二硫酸
カリウムの分解が起こり、試薬１ｇあたりの錫浸出効率
が悪くなる。また、混合水溶液の温度を７５℃以上にす
ることで塩化第二鉄溶液なみの大きな浸出力を得ること
ができる。しかし、９５℃を超えるとペルオキソ二硫酸
カリウムの分解と水の蒸発による液量の顕著な減少が起
こり、５０℃未満、とりわけ１０℃未満では十分な錫浸
出速度が得られず、脱錫処理に時間がかかるので、脱錫
温度を１０〜９５℃とする。Iron is hardly leached in this solution, and the leaching rate of tin is higher than that of the conventional alkali detinning method.
If the concentration of NaOH is less than 40 g / l and the concentration of K 2 S 2 O 8 is less than 5 g / l, the tin leaching rate decreases and detinning cannot be performed in a short time. Conversely, the NaOH concentration is 330 g / l
Even if the concentration of K 2 S 2 O 8 exceeds 30 g / l, the tin leaching rate is not so high, and rather potassium peroxodisulfate is decomposed, and the tin leaching efficiency per 1 g of the reagent is deteriorated. In addition, by setting the temperature of the mixed aqueous solution to 75 ° C. or higher, it is possible to obtain a large immersion output similar to that of the ferric chloride solution. However, when the temperature exceeds 95 ° C, decomposition of potassium peroxodisulfate and water evaporation remarkably decrease, and when the temperature is less than 50 ° C, particularly less than 10 ° C, a sufficient tin leaching rate cannot be obtained, and the tin removal treatment is difficult. Since it takes time, the detinning temperature is set to 10 to 95 ° C.
【００２０】脱錫処理後、固体分の鉄を引き上げ、洗浄
後、高品位鉄スクラップとして回収する。After the tin removal treatment, the solid iron is pulled up, washed and recovered as high-grade iron scrap.
【００２１】脱錫処理後の浸出液については、例えばＦ
ｉｒｓｔ Ｉｎｔｅｒｎａｔｉｏｎａｌ ｔｉｎｐｌａ
ｔｅ ｃｏｎｆｅｒｅｎｃｅ（１９７６）Ｐ４２７に記
載されているような方法で浸出液から錫を沈澱回収、あ
るいは電解回収する。For the leachate after the tin removal treatment, for example, F
irst International tinpla
Precipitation recovery or electrolytic recovery of tin from the leachate by the method described in te conference (1976) P427.
【００２２】[0022]
〔塗膜除去工程〕１０ｍｍ×１０ｍｍに裁断されたビー
ル缶を用いて、温度７０℃、濃度１０％ＮａＯＨ水溶液
中で塗装被膜の剥離実験を行った。その結果、ビール缶
の表面塗膜の剥離に、超音波洗浄を用いない場合１５分
を要したが、超音波洗浄を用いた場合７分で完了した。[Coating film removal step] Using a beer can that was cut into a size of 10 mm x 10 mm, a peeling test of the coating film was conducted in a 10% NaOH aqueous solution at a temperature of 70 ° C. As a result, it took 15 minutes to peel off the surface coating film of the beer can when ultrasonic cleaning was not used, but it was completed in 7 minutes when ultrasonic cleaning was used.
【００２３】〔脱錫処理工程〕メッキ錫の両面の平均目
付け量が９．２ｇ／ｍ2 の錫メッキ板７ｇを対象に、脱
錫試験を行った。その結果を表１に示す。[Detinization Treatment Step] A tin removal test was conducted on 7 g of a tin-plated plate having an average basis weight of 9.2 g / m 2 on both sides of plated tin. The results are shown in Table 1.
【００２４】[0024]
【表１】 ＊）：比較例だけ反応時間が１０分、その他は反応時
間が５分。 錫除去率＝（錫浸出量）／（脱錫処理前錫含有量） 比較例：塩化第二鉄水溶液（１０８ｇ／ｌＦｅＣｌ
3 ）（２０℃） 比較例：硝酸ナトリウム−苛性ソーダ溶液（２０ｇ／
ｌＮａＮＯ3 ；１００ｇ／ｌＮａＯＨ）（７５℃） 比較例：ペルオキソ二硫酸カリウム−苛性ソーダ溶液
（２０ｇ／ｌＫ2 Ｓ2Ｏ8 ；１００ｇ／ｌＮａＯＨ）
（５℃） 本発明例：ペルオキソ二硫酸カリウム−苛性ソーダ溶
液（２０ｇ／ｌＫ2 Ｓ2 Ｏ8 ；１００ｇ／ｌＮａＯＨ）
（１０℃） 本発明例：ペルオキソ二硫酸カリウム−苛性ソーダ溶
液（２０ｇ／ｌＫ2 Ｓ2 Ｏ8 ；１００ｇ／ｌＮａＯＨ）
（２０℃） 本発明例：ペルオキソ二硫酸カリウム−苛性ソーダ溶
液（２０ｇ／ｌＫ2 Ｓ2 Ｏ8 ；１００ｇ／ｌＮａＯＨ）
（７５℃）[Table 1] *): Reaction time is 10 minutes only in Comparative Example, and 5 minutes in other cases. Tin removal rate = (tin leaching amount) / (tin content before detinization treatment) Comparative example: ferric chloride aqueous solution (108 g / lFeCl
3 ) (20 ° C) Comparative example: sodium nitrate-caustic soda solution (20 g /
1NaNO 3 ; 100 g / l NaOH) (75 ° C.) Comparative example: potassium peroxodisulfate-sodium hydroxide solution (20 g / l K 2 S 2 O 8 ; 100 g / l NaOH)
(5 ° C.) Inventive Example: Potassium peroxodisulfate-caustic soda solution (20 g / lK 2 S 2 O 8 ; 100 g / l NaOH)
(10 ° C.) Inventive Example: Potassium peroxodisulfate-caustic soda solution (20 g / lK 2 S 2 O 8 ; 100 g / l NaOH)
(20 ° C.) Inventive Example: Potassium peroxodisulfate-caustic soda solution (20 g / lK 2 S 2 O 8 ; 100 g / l NaOH)
(75 ° C)
【００２５】１０８ｇ／ｌ塩化第二鉄水溶液（比較例
）と２０ｇ／ｌ硝酸ナトリウム−１００ｇ／ｌ苛性ソ
ーダ溶液（比較例）が、従来塩化鉄法とアルカリ脱錫
法とで用いられている浸出溶液である。本発明で使用す
る溶液の例としては、２０ｇ／ｌペルオキソ二硫酸カリ
ウム−１００ｇ／ｌ苛性ソーダ溶液（本発明例〜）
を用いた。しかし、比較例のように水溶液温度が１０
℃未満では錫除去率が５０％を割った。この結果から、
比較例と本発明例〜が錫除去率に優れていること
がわかるが、比較例では全浸出量が多い、つまり鉄浸
出の量が多いので、被メッキ材が鉄である場合、比較例
は脱錫方法としては不適当である。108 g / l ferric chloride aqueous solution (comparative example) and 20 g / l sodium nitrate-100 g / l caustic soda solution (comparative example) are leaching solutions conventionally used in the iron chloride method and the alkaline detinning method. Is. Examples of the solution used in the present invention include 20 g / l potassium peroxodisulfate-100 g / l caustic soda solution (invention examples-).
Was used. However, as in the comparative example, the temperature of the aqueous solution is 10
When the temperature was lower than 0 ° C, the tin removal rate fell below 50%. from this result,
It can be seen that the comparative example and the present invention example ~ are excellent in the tin removal rate, but in the comparative example, the total leaching amount is large, that is, the amount of iron leaching is large, so when the plated material is iron, the comparative example is It is unsuitable as a detinning method.
【００２６】本発明例は脱錫速度の点で優れた脱錫方
法であるが、本発明例およびも従来法と比べ十分に
速い脱錫速度を有し、しかも常温近辺での脱錫処理であ
るので、操作の簡便性の点で優れた脱錫方法であるとい
える。The example of the present invention is a tin removal method which is excellent in terms of the tin removal rate. However, it has a sufficiently high tin removal rate as compared with the examples of the present invention and the conventional method, and the tin removal treatment is performed at around room temperature. Therefore, it can be said that it is an excellent tin removal method in terms of the ease of operation.
【００２７】[0027]
【発明の効果】本発明により、缶屑の脱錫処理時間を大
幅に短縮することが可能となる。According to the present invention, the tin removal time of can waste can be significantly shortened.
【図１】本発明の脱錫方法の例のフローを示す図であ
る。FIG. 1 is a diagram showing a flow of an example of a tin removal method of the present invention.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中野 寛文 千葉県富津市新富20−１ 新日本製鐵株式 会社技術開発本部内 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hirofumi Nakano 20-1 Shintomi, Futtsu City, Chiba Shin Nippon Steel Co., Ltd. Technology Development Division
Claims (3)
ｍ×５０ｍｍのチップ状にし、磁力選別機にかけて非鉄
分を除去した後、７０〜９５℃の４０〜３３０ｇ／ｌ水
酸化ナトリウム水溶液中で超音波洗浄することを特徴と
する缶屑の塗膜除去方法。1. A crusher for shavings of 5 mm × 5 mm to 50 m
A coating film of cans characterized by being made into m × 50 mm chips, subjected to a magnetic separator to remove non-ferrous components, and then ultrasonically washed in 40-330 g / l sodium hydroxide aqueous solution at 70-95 ° C. Method.
水酸化ナトリウムと５〜３０ｇ／ｌペルオキソ二硫酸カ
リウムとからなる混合水溶液中で脱錫処理することを特
徴とする缶屑の脱錫方法。2. 40 to 330 g / l at a temperature of 10 to 95 ° C.
A method for detinning tin waste, which comprises detinning in a mixed aqueous solution of sodium hydroxide and 5 to 30 g / l potassium peroxodisulfate.
施した後、請求項２記載の脱錫方法を実施することを特
徴とする缶屑の脱錫方法。3. A method for detinning tin waste, which comprises performing the method for removing a coating film of tin waste according to claim 1 and then performing the tin removal method according to claim 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21686293A JPH0711468A (en) | 1993-04-30 | 1993-08-10 | Method for removing coating film of can scrap and method for removing tin |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12462493 | 1993-04-30 | ||
| JP5-124624 | 1993-04-30 | ||
| JP21686293A JPH0711468A (en) | 1993-04-30 | 1993-08-10 | Method for removing coating film of can scrap and method for removing tin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0711468A true JPH0711468A (en) | 1995-01-13 |
Family
ID=26461274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21686293A Withdrawn JPH0711468A (en) | 1993-04-30 | 1993-08-10 | Method for removing coating film of can scrap and method for removing tin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0711468A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101252137B1 (en) * | 2010-11-12 | 2013-04-08 | 덕산하이메탈(주) | Manufacturing method of tin for radiating low alpha radioactive rays using electrolytic refining |
| JP2014125640A (en) * | 2012-12-25 | 2014-07-07 | Sanwa Yuka Kogyo Kk | Removal liquid for chromium-based hard film |
-
1993
- 1993-08-10 JP JP21686293A patent/JPH0711468A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101252137B1 (en) * | 2010-11-12 | 2013-04-08 | 덕산하이메탈(주) | Manufacturing method of tin for radiating low alpha radioactive rays using electrolytic refining |
| JP2014125640A (en) * | 2012-12-25 | 2014-07-07 | Sanwa Yuka Kogyo Kk | Removal liquid for chromium-based hard film |
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| A300 | Withdrawal of application because of no request for examination |
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