JPH07145583A - Deinking and bleaching of waste paper - Google Patents
Deinking and bleaching of waste paperInfo
- Publication number
- JPH07145583A JPH07145583A JP5315997A JP31599793A JPH07145583A JP H07145583 A JPH07145583 A JP H07145583A JP 5315997 A JP5315997 A JP 5315997A JP 31599793 A JP31599793 A JP 31599793A JP H07145583 A JPH07145583 A JP H07145583A
- Authority
- JP
- Japan
- Prior art keywords
- treatment
- waste paper
- bleaching
- pulp
- deinking
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、古紙から古紙再生パル
プを製造する際の、古紙の脱インキ、漂白方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for deinking and bleaching waste paper when producing recycled pulp from waste paper.
【０００２】[0002]
【従来の技術】古紙再生パルプ（以下パルプという。）
は、通常、次の各工程を順次経て製造される。 古紙の脱インキ、漂白工程。 脱インキ、漂白された古紙をパルプ化する離解工程。 パルプの漂白工程。 夾雑物や脱離されたインキを系外に除去する工程。2. Description of the Related Art Recycled waste pulp (hereinafter referred to as pulp)
Is usually manufactured through the following steps in sequence. Deinking and bleaching of used paper. A disintegration process to pulp deinked and bleached waste paper. Bleaching process of pulp. The process of removing contaminants and desorbed ink outside the system.
【０００３】従来から古紙の脱インキ、漂白方法ではア
ルカリ剤と亜硫酸塩が用いられているが、近年亜硫酸塩
を亜二チオン酸塩に代えて用いる方法が提案されてい
る。前記の工程を施すことなく、これら脱インキ、漂
白方法で得られたパルプの白色度は低く、更に白色度を
上げるために、２次漂白としての前記の工程すなわ
ち、次亜塩素酸ソーダや過酸化水素のような漂白剤で低
温で長時間漂白する工程が採用されている。しかし得ら
れたパルプはそれでも満足な白色度とはいえず、又需要
家からのそれ以上の高白色度のものの要望も多く、かか
る古紙の脱インキ、漂白方法は十分なものとはいい難
い。Conventionally, an alkaline agent and a sulfite have been used in the deinking and bleaching methods of waste paper, but in recent years, a method has been proposed in which the sulfite is replaced with a dithionite. The pulp obtained by these deinking and bleaching methods without performing the above-mentioned steps has a low whiteness, and in order to further increase the whiteness, the above-mentioned step as the secondary bleaching, that is, sodium hypochlorite and excess A process of bleaching at a low temperature for a long time with a bleaching agent such as hydrogen oxide is adopted. However, the obtained pulp is not said to have a satisfactory whiteness, and there are many demands from customers for higher whiteness, and it is difficult to say that such methods of deinking and bleaching waste paper are sufficient.
【０００４】[0004]
【発明が解決しょうとする課題】本発明の目的は、高白
色度のパルプを製造するのに好適な古紙の脱インキ、漂
白方法を提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for deinking and bleaching waste paper suitable for producing high-whiteness pulp.
【０００５】[0005]
【課題を解決するための手段】本発明者らは、古紙の脱
インキ、漂白方法について種々検討した結果、古紙を順
次３種の処理に供することにより、高白色度のパルプが
製造できることを見出し本発明に至った。As a result of various studies on deinking and bleaching methods of waste paper, the present inventors have found that high-whiteness pulp can be produced by sequentially treating waste paper with three kinds of treatments. The present invention has been completed.
【０００６】即ち本発明は、古紙を脱インキ、漂白する
にあたり、古紙を順次、次の第１処理、第２処理及び第
３処理に供することを特徴とする古紙の脱インキ、漂白
方法に関するものである。 第１処理：アルカリ性下での亜硫酸塩による処理。 第２処理：アルカリ性下での亜硫酸塩及び亜硫酸塩以外
の還元剤による処理。 第３処理：アルカリ性下及び珪酸塩の存在下での過酸化
水素による処理。That is, the present invention relates to a method for deinking and bleaching used paper, characterized in that when deinking and bleaching used paper, the used paper is sequentially subjected to the following first treatment, second treatment and third treatment. Is. First treatment: treatment with sulfite under alkaline conditions. Second treatment: Treatment with sulfite and a reducing agent other than sulfite under alkaline conditions. Third treatment: treatment with hydrogen peroxide under alkaline conditions and in the presence of silicates.
【０００７】本発明の古紙の脱インキ、漂白方法におい
ては、古紙を上記の３つの処理に順次供することが肝要
であり、かかる処理によって、驚くべきことに脱インキ
及び漂白が効率的に行われ、その結果前記の従来方法で
は達成し難い高白色度のパルプを得ることが可能とな
る。これらの処理のいずれかでも省略したり、又は施す
順序を変更することは所期の目的を達成することができ
ない。In the method for deinking and bleaching waste paper according to the present invention, it is essential to subject the waste paper to the above-mentioned three treatments in sequence. Surprisingly, deinking and bleaching are efficiently performed by such treatment. As a result, it becomes possible to obtain a high-whiteness pulp that is difficult to achieve by the above-mentioned conventional method. Omitting or changing the order of applying any of these treatments cannot achieve the intended purpose.
【０００８】本発明の第１処理及び第２処理に用いる亜
硫酸塩としては、亜硫酸ナトリウム、亜硫酸カリウムな
どの亜硫酸アルカリ金属塩が挙げられる。本発明の第１
処理、第２処理及び第３処理をアルカリ性下で行なうに
際して用いるアルカリ剤としては、水酸化ナトリウム、
水酸化カリウムなどの水酸化アルカリや炭酸ナトリウ
ム、炭酸カリウムなどの炭酸アルカリ金属塩などが挙げ
られる。Examples of the sulfite used in the first treatment and the second treatment of the present invention include alkali metal sulfites such as sodium sulfite and potassium sulfite. First of the present invention
As the alkaline agent used when the treatment, the second treatment, and the third treatment are carried out under an alkaline condition, sodium hydroxide,
Examples thereof include alkali hydroxides such as potassium hydroxide and alkali metal carbonates such as sodium carbonate and potassium carbonate.
【０００９】本発明の第２処理に用いる亜硫酸塩以外の
還元剤としては、亜二チオン酸アルカリ金属塩、二酸化
チオ尿素、アルカリ金属ボロハイドライド塩などが挙げ
られる。Examples of the reducing agent other than the sulfite used in the second treatment of the present invention include alkali metal dithionite, thiourea dioxide, and alkali metal borohydride.
【００１０】本発明の第３処理に用いる珪酸塩としては
珪酸ナトリウム等の珪酸アルカリ金属などが挙げられ
る。Examples of the silicate used in the third treatment of the present invention include alkali metal silicates such as sodium silicate.
【００１１】本発明に使用される古紙としては模造古
紙、上ケント古紙、色上古紙などが挙げられる。Examples of the waste paper used in the present invention include imitation waste paper, upper Kent waste paper, colored upper waste paper and the like.
【００１２】次に、本発明の第１処理、第２処理及び第
３処理についての好ましい実施態様を説明する。尚、以
下の説明において、各処理で使用する薬剤の使用量は、
特に断らない限り処理に供される絶乾古紙の重量に対す
る重量％で示す。Next, preferred embodiments of the first treatment, the second treatment and the third treatment of the present invention will be described. In the following description, the amount of drug used in each process is
Unless otherwise specified, it is shown in% by weight based on the weight of absolutely dried old paper to be treated.
【００１３】まず、第１処理の好ましい実施態様として
は、古紙を水でスラリーに調製し、そのｐＨが処理開始
時８．５〜１０．５、好ましくは９．０〜１０．０にな
るように炭酸アルカリ金属塩０．１〜０．６％を加えた
後、亜硫酸アルカリ金属塩を０．５〜３％加え１〜５時
間８５〜１８０℃、好ましくは１２０〜１５０℃に加熱
する方法が挙げられる。First, as a preferred embodiment of the first treatment, used paper is prepared into a slurry with water so that the pH thereof is 8.5 to 10.5, preferably 9.0 to 10.0 at the start of the treatment. After adding 0.1 to 0.6% of alkali metal carbonate to 0.5 to 0.5% to 3% of alkali metal sulfite and heating to 85 to 180 ° C., preferably 120 to 150 ° C. for 1 to 5 hours. Can be mentioned.
【００１４】また、第２処理の好ましい実施態様として
は、第１処理後の古紙スラリ−にそのｐＨが処理開始時
８．５〜１０．５、好ましくは９．０〜１０．０になる
ように再び炭酸アルカリ金属塩０．１〜０．３％を加
え、次に亜硫酸アルカリ金属塩０．１〜０．３％及びこ
れ以外の還元剤、好ましくは亜硫酸アルカリ金属塩と異
なる酸化還元電位を持つ還元剤（亜二チオン酸ナトリウ
ム、二酸化チオ尿素、ナトリウムボロハイドライド等）
を０．１〜１．０％加え０．５〜３時間８５〜１８０
℃、好ましくは９０〜１００℃に加熱する方法が挙げら
れる。第２処理の温度は第１処理の温度よりも低い方が
好ましい。In a preferred embodiment of the second treatment, the pH of the used paper slurry after the first treatment is 8.5-10.5, preferably 9.0-10.0 at the start of the treatment. 0.1 to 0.3% of alkali metal carbonate again, and then 0.1 to 0.3% of alkali metal sulfite and another reducing agent, preferably a redox potential different from that of the alkali metal sulfite. Having reducing agent (sodium dithionite, thiourea dioxide, sodium borohydride, etc.)
0.1-1.0% added for 0.5-3 hours 85-180
The method of heating at 90 ° C., preferably 90 to 100 ° C. may be mentioned. The temperature of the second treatment is preferably lower than the temperature of the first treatment.
【００１５】さらに、第３処理の好ましい実施態様とし
ては、第２処理後の古紙スラリ−にまず珪酸アルカリ金
属塩０．５〜１．５％を加え、次にそのｐＨが処理開始
時９〜１２、好ましくは１０〜１１．５になるように水
酸化アルカリ０．１〜０．５％を加えた後、過酸化水素
を０．１〜２．０％加え１〜５時間４０〜９０℃、好ま
しくは６０〜８０℃に加熱する方法が挙げられる。過酸
化水素は通常３５〜６０％の濃度のものが使用される。Further, as a preferred embodiment of the third treatment, 0.5 to 1.5% of alkali metal silicate is first added to the used paper slurry after the second treatment, and then the pH thereof is 9 to 9 at the start of treatment. 12, 0.1 to 0.5% of alkali hydroxide is added to adjust the concentration to preferably 10 to 11.5, and then 0.1 to 2.0% of hydrogen peroxide is added for 1 to 5 hours at 40 to 90 ° C. The heating method is preferably 60 to 80 ° C. Hydrogen peroxide having a concentration of 35 to 60% is usually used.
【００１６】このように本発明の方法は、上記３処理を
連続的に実施できるので、各処理間の水洗を省略でき、
操作が簡便となり又排水が減少出来る。As described above, according to the method of the present invention, since the above three treatments can be continuously carried out, washing with water between the treatments can be omitted,
The operation is simple and the drainage can be reduced.
【００１７】古紙のスラリー濃度は通常３〜５０重量％
であるが、その濃度が高い程薬剤の効果が大きく、排水
も少なくなるので２０〜３５重量％か好ましい。The slurry concentration of waste paper is usually 3 to 50% by weight.
However, the higher the concentration, the greater the effect of the drug and the less the drainage, so 20 to 35% by weight is preferable.
【００１８】本発明の古紙の脱インキ、漂白方法におい
ては、従来使用の金属封鎖剤を使用することができ、そ
の使用量は絶乾古紙１００重量部に対して０．０５〜１
重量部である。金属封鎖剤としては、例えばトリポリ燐
酸ナトリウム、ジエチレントリアミン五酢酸五ナトリウ
ム等が挙げられる。In the method of deinking and bleaching waste paper according to the present invention, a conventionally used sequestering agent can be used, and the amount of the sequestering agent used is 0.05 to 1 with respect to 100 parts by weight of absolutely dried waste paper.
Parts by weight. Examples of the sequestering agent include sodium tripolyphosphate and pentasodium diethylenetriaminepentaacetate.
【００１９】以上処理された古紙スラリーは水で希釈さ
れた後、パルパーやニーダーのような離解機に供給され
る。この離解機で未離解古紙をパルプ化して、次にスク
リーンやセントリヒューガルクリーナー等で粗選する。
その後フロテーション又はウオッシングを行なってスク
リーン等で精選して高白色度のパルプを得る。粗選前後
のパルプを酸化漂白処理（例えば、過酸化水素漂白、次
亜塩素酸ソーダ漂白）すれば更に高白色度のパルプを得
ることができる。このようにして得られたパルプは常法
に従って抄造されて紙製品にすることができる。The used paper slurry thus treated is diluted with water and then supplied to a disintegrator such as a pulper or a kneader. Unrefined waste paper is pulped with this disintegrator and then roughly selected with a screen, centrifugal cleaner or the like.
After that, flotation or washing is performed and a pulp having a high whiteness is obtained by carefully selecting with a screen or the like. By subjecting the pulp before and after the rough selection to an oxidative bleaching treatment (for example, bleaching with hydrogen peroxide, bleaching with sodium hypochlorite), a pulp with a higher whiteness can be obtained. The pulp thus obtained can be made into a paper product by papermaking according to a conventional method.
【００２０】このパルプ化の際に界面活性剤を使用する
ことができ、界面活性剤としては従来使用のノニオン
型、アニオン型が挙げられ、その使用量は絶乾古紙１０
０重量部に対して０．０５〜０．５重量部が好ましい。A surfactant can be used in the pulping, and examples of the surfactant include nonionic type and anionic type which have been conventionally used.
0.05 to 0.5 parts by weight is preferable with respect to 0 parts by weight.
【００２１】[0021]
【実施例】以下、実施例により本発明方法を説明する
が、本発明は以下の実施例に限定されるものではない。 実施例１ 容器中の上質印刷古紙に水を加えて古紙濃度を３０重量
％に調製して古紙スラリ−を得た。この古紙スラリーを
以下の処理に供した。 第１処理：古紙スラリーに炭酸ナトリウム０．４％（対
絶乾古紙重量、以下の薬剤についても同様。）及び亜硫
酸ナトリウム２．５％を順次添加し、密閉して攪拌し
た。ｐＨは９．６であった。これを昇温し、１３０℃に
て４時間蒸煮した（第１処理終了時：ｐＨ７．８）。 第２処理：第１処理終了後、容器を開封し、炭酸ナトリ
ウム０．２％、亜硫酸ナトリウム０．２％及び亜二チオ
ン酸ナトリウム０．３％を順次速やかに添加し、密閉し
て１時間攪拌した。この温度は蒸煮時の余熱で９０℃〜
９５℃であった（第２処理終了時：ｐＨ８．０）。 第３処理：第２処理終了後、容器を開封し、３５％珪酸
ナトリウム水溶液３％及び水酸化ナトリウム０．４％を
順次加えよく攪拌した。ｐＨは１１．５であった。これ
に３５％過酸化水素水３％を加え密封して７０℃で３時
間攪拌した。EXAMPLES The method of the present invention will be described below with reference to examples, but the present invention is not limited to the following examples. Example 1 Water was added to high-quality printed waste paper in a container to adjust the waste paper concentration to 30% by weight to obtain a waste paper slurry. This waste paper slurry was subjected to the following treatment. First treatment: 0.4% of sodium carbonate (weight of absolute dry waste paper, the same applies to the following chemicals) and 2.5% of sodium sulfite were sequentially added to the waste paper slurry, and the mixture was sealed and stirred. The pH was 9.6. This was heated and steamed at 130 ° C. for 4 hours (at the end of the first treatment: pH 7.8). Second treatment: After completion of the first treatment, the container is opened, 0.2% of sodium carbonate, 0.2% of sodium sulfite and 0.3% of sodium dithionite are sequentially and rapidly added, and the vessel is hermetically closed for 1 hour. It was stirred. This temperature is 90 ° C-
It was 95 ° C. (at the end of the second treatment: pH 8.0). Third treatment: After completion of the second treatment, the container was opened, 3% of a 35% sodium silicate aqueous solution and 0.4% of sodium hydroxide were sequentially added, and well stirred. The pH was 11.5. To this was added 35% hydrogen peroxide water 3%, and the mixture was sealed and stirred at 70 ° C. for 3 hours.
【００２２】このようにして処理された古紙スラリー
（ｐＨ１０．８）は容器中から取り出され、水でパルプ
濃度を３重量％に希釈しパルパーで離解後、水洗・脱水
を繰り返し行なってスクリーン処理してパルプを得た。
このパルプをＪＩＳ Ｐ ８２０９に従って抄造して紙
を得た。この紙についての白色度はＪＩＳ Ｐ ８１２
３に従って測定し８３であり、紙一定面積当りの残イン
キ量はＪ．ＴＡＰＰＩ紙パルプ試験方法Ｎｏ．３９−８
２を参考に測定し百分率で０．００８％である。The waste paper slurry (pH 10.8) treated in this way is taken out from the container, diluted with water to a pulp concentration of 3% by weight, disintegrated with a pulper, and then repeatedly washed with water and dehydrated for screen treatment. To obtain pulp.
This pulp was made into paper according to JIS P 8209 to obtain paper. The whiteness of this paper is JIS P 812.
It was 83 when measured in accordance with No. 3, and the residual ink amount per a certain area of paper is J. TAPPI paper pulp test method No. 39-8
It is 0.008% as a percentage when measured with reference to 2.
【００２３】比較例１ 容器中の上質印刷古紙に水を加えて古紙濃度を３０重量
％に調製して古紙スラリーを得た。この古紙スラリーに
炭酸ナトリウム０．４％（対絶乾古紙重量、以下の薬剤
についても同様。）及び亜硫酸ナトリウム２．５％を順
次添加し、密閉して攪拌しながら１３０℃にて４時間蒸
煮した。蒸煮終了後、処理された古紙スラリー（ｐＨ
７．８）を容器中から取り出し、水でパルプ濃度を３重
量％に希釈しパルパーで離解後、水洗・脱水を繰り返し
行なってスクリーン処理してパルプを得た。次いで、実
施例１と同様にしてパルプを抄紙し、その白色度の測定
及び紙一定面積当りの残インキ量の測定を行なった。そ
の結果白色度は７３で該残インキ量は百分率で０．０８
６％であった。Comparative Example 1 Waste paper slurry was prepared by adding water to a high-quality printed waste paper in a container to adjust the waste paper concentration to 30% by weight. To this waste paper slurry, 0.4% sodium carbonate (weight of dry waste paper, the same applies to the following chemicals) and 2.5% sodium sulfite were sequentially added, and the mixture was sealed and steamed at 130 ° C for 4 hours with stirring. did. After steaming, treated waste paper slurry (pH
7.8) was taken out from the container, and the pulp concentration was diluted to 3% by weight with water, disintegrated with a pulper, washed with water and dehydrated repeatedly, and screened to obtain pulp. Then, the pulp was made into paper in the same manner as in Example 1, the whiteness of the pulp was measured, and the amount of residual ink per fixed area of the paper was measured. As a result, the whiteness was 73 and the residual ink amount was 0.08 in percentage.
It was 6%.
【００２４】また、水洗後のパルプを更に次亜塩素酸ナ
トリウム漂白を施した。すなわち、このパルプを水でパ
ルプ濃度を１０重量％に希釈しｐＨを約９にアルカリで
調製して、有効塩素１０％の次亜塩素酸ナトリウム水溶
液１０％を加えて攪拌後、２５℃で８時間静置した。そ
の後、水洗・脱水を繰り返し行なってスクリーン処理し
てパルプを得た。実施例１と同様にして得たパルプを抄
紙し、その白色度の測定を行なった。その結果、白色度
は７５であった。The pulp after washing with water was further bleached with sodium hypochlorite. That is, this pulp was diluted with water to a pulp concentration of 10% by weight, adjusted to pH of about 9 with an alkali, added with 10% of an effective chlorine aqueous solution of 10% sodium hypochlorite, stirred, and then stirred at 25 ° C. for 8 hours. Let stand for hours. Then, washing and dehydration were repeated and screen treatment was performed to obtain pulp. The pulp obtained in the same manner as in Example 1 was made into paper and its whiteness was measured. As a result, the whiteness was 75.
【００２５】比較例２ 容器中の上質印刷古紙に水を加えて古紙濃度を３０重量
％に調製して古紙スラリーを得た。この古紙スラリーに
水酸化ナトリウム１％（対絶乾古紙重量、以下の薬剤に
ついても同様。）及び炭酸ナトリウム０．５％を順次添
加し、密閉して攪拌しながら６０℃に加熱し、内圧が約
０．５ｋｇ／ｃｍ2になった時点で開封して亜二チオン
酸ナトリウム０．５％を速やかに加え、密閉して６０℃
で４時間攪拌した。その後、処理された古紙スラリーを
容器から取り出し、水でパルプを濃度を３重量％に希釈
しパルパーで離解後、水洗・脱水を繰り返し行なってス
クリーン処理してパルプを得た。次いで、実施例１と同
様にしてパルプを抄紙し、白色度の測定及び紙一定面積
当りの残インキ量の測定を行なった。その結果、白色度
は７４．９で及び該残インキ量は百分率で０．０３０％
であった。Comparative Example 2 Waste paper slurry was prepared by adding water to the good quality printed waste paper in a container to adjust the waste paper concentration to 30% by weight. Sodium hydroxide 1% (absolute dry paper weight, the same applies to the following chemicals) and sodium carbonate 0.5% were sequentially added to this waste paper slurry, and the mixture was sealed and heated to 60 ° C. with stirring, and the internal pressure was increased. When it reaches about 0.5 kg / cm 2 , it is opened and 0.5% of sodium dithionite is rapidly added.
It was stirred for 4 hours. Then, the treated waste paper slurry was taken out from the container, the pulp was diluted with water to a concentration of 3% by weight, disintegrated with a pulper, washed with water and dehydrated repeatedly to obtain a pulp by screen treatment. Then, the pulp was made into paper in the same manner as in Example 1, and the whiteness and the amount of residual ink per fixed area of the paper were measured. As a result, the whiteness was 74.9 and the residual ink amount was 0.030% in percentage.
Met.
【００２６】また、比較例１と同様にして水洗後のパル
プに次亜塩素酸ナトリウム漂白処理を施した。次いで、
実施例１と同様にしてパルプを抄紙し、その白色度の測
定を行なった。その結果、白色度は７７．５であった。In the same manner as in Comparative Example 1, the pulp after washing with water was subjected to sodium hypochlorite bleaching treatment. Then
The pulp was made into paper in the same manner as in Example 1 and its whiteness was measured. As a result, the whiteness was 77.5.
【００２７】実施例１並びに比較例１及び２の測定結果
より、亜硫酸ナトリウム処理、亜硫酸ナトリウムと亜二
チオン酸ナトリウムとの混合処理及び過酸化水素処理の
３処理からなる本発明方法は、比較例１の亜硫酸ナトリ
ウム処理による場合と比べて白色度が１０ポイント向上
し、残インキ率が１／１０に減少し、比較例２の亜二チ
オン酸ナトリウム処理による場合と比べても白色度が８
ポイント高く、残インキ率が１／４に減少した。白色度
について比較例１、２の次亜塩素酸ナトリウム処理をし
た場合と比べても５〜８ポイント高い結果を示してい
る。From the measurement results of Example 1 and Comparative Examples 1 and 2, the method of the present invention consisting of three treatments of sodium sulfite treatment, mixed treatment of sodium sulfite and sodium dithionite and hydrogen peroxide treatment was confirmed to be a comparative example. The whiteness was improved by 10 points and the residual ink ratio was reduced to 1/10 as compared with the case of the sodium sulfite treatment of No. 1, and the whiteness was 8 even compared with the case of the sodium dithionite treatment of Comparative Example 2.
The percentage was high, and the residual ink ratio was reduced to 1/4. The whiteness is 5 to 8 points higher than that of Comparative Examples 1 and 2 which are treated with sodium hypochlorite.
【００２８】実施例２ 実施例１の第１処理において亜硫酸ナトリウム２．５％
を１％に減じ、第３処理において３５％珪酸ナトリウム
水溶液３％を２．５５％に、水酸化ナトリウム０．４％
を０．２％に（珪酸ナトリウム及び水酸化ナトリウム添
加時ｐＨ１１）、及び３５％過酸化水素水３％を１．５
％に添加量を夫々減じた以外は、実施例１と同様にして
パルプを得、得られたパルプを抄紙し白色度を測定し
た。その結果、白色度は８１．５であった。Example 2 Sodium sulfite 2.5% in the first treatment of Example 1
Is reduced to 1%, and in the third treatment, 35% sodium silicate aqueous solution 3% to 2.55%, sodium hydroxide 0.4%
To 0.2% (pH 11 when sodium silicate and sodium hydroxide are added), and 35% hydrogen peroxide solution 3% to 1.5%
Pulp was obtained in the same manner as in Example 1 except that the addition amount was reduced to 100%, and the obtained pulp was paper-made to measure the whiteness. As a result, the whiteness was 81.5.
【００２９】実施例３ 実施例１の第２処理において亜二チオン酸ナトリウム
０．３％の代わりにナトリウムボロハイドライド０．３
％を用いた（添加時ｐＨ９．８、第２処理終了時ｐＨ
８．２）以外は、実施例１と同様にしてパルプを得、得
たパルプを抄紙し白色度を測定した。その結果、白色度
は８３．１であった。Example 3 In the second treatment of Example 1, sodium borohydride 0.3% was used instead of sodium dithionite 0.3%.
% (PH at the time of addition, pH 9.8 at the end of the second treatment)
Pulp was obtained in the same manner as in Example 1 except for 8.2), and the obtained pulp was paper-made to measure the whiteness. As a result, the whiteness was 83.1.
【００３０】[0030]
【発明の効果】本発明方法によれば、脱インキ漂白が効
率的に行なわれ、その結果従来の方法では達成し難い高
白色度の古紙再生パルプを得ることができる。したがっ
て，本発明方法は工業的に極めて有意義なものである。According to the method of the present invention, deinking bleaching is efficiently performed, and as a result, recycled pulp of high whiteness which is difficult to achieve by the conventional method can be obtained. Therefore, the method of the present invention is industrially very meaningful.
Claims (1)
紙を順次、次の第１処理、第２処理及び第３処理に供す
ることを特徴とする古紙の脱インキ、漂白方法。 第１処理：アルカリ性下での亜硫酸塩による処理。 第２処理：アルカリ性下での亜硫酸塩及び亜硫酸塩以外
の還元剤による処理。 第３処理：アルカリ性下及び珪酸塩の存在下での過酸化
水素による処理。1. A method of deinking and bleaching waste paper, which comprises subjecting waste paper to the following first treatment, second treatment and third treatment in order to deink and bleach the waste paper. First treatment: treatment with sulfite under alkaline conditions. Second treatment: Treatment with sulfite and a reducing agent other than sulfite under alkaline conditions. Third treatment: treatment with hydrogen peroxide under alkaline conditions and in the presence of silicates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5315997A JPH07145583A (en) | 1993-11-22 | 1993-11-22 | Deinking and bleaching of waste paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5315997A JPH07145583A (en) | 1993-11-22 | 1993-11-22 | Deinking and bleaching of waste paper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07145583A true JPH07145583A (en) | 1995-06-06 |
Family
ID=18072094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5315997A Pending JPH07145583A (en) | 1993-11-22 | 1993-11-22 | Deinking and bleaching of waste paper |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07145583A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0741203A1 (en) * | 1995-05-05 | 1996-11-06 | SOLVAY MINERALS, Inc. | Method of deinking wastepaper |
| JP2008536020A (en) * | 2005-04-08 | 2008-09-04 | ナルコ カンパニー | Improved composition and process for papermaking |
| CN101775749A (en) * | 2010-03-05 | 2010-07-14 | 杨树香 | Deinking, bleaching and treating process of waste paper |
| CN101831825A (en) * | 2010-03-25 | 2010-09-15 | 吉林晨鸣纸业有限责任公司 | Improved production method of waste paper deinking pulp |
| CN103437230A (en) * | 2013-08-29 | 2013-12-11 | 华南理工大学 | Biological enzyme-based process for deinking wastepaper by neutral-alkaline dual-loop flotation |
| JP2020172717A (en) * | 2019-04-09 | 2020-10-22 | 大王製紙株式会社 | Method of producing pulp raw material from waste paper |
-
1993
- 1993-11-22 JP JP5315997A patent/JPH07145583A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0741203A1 (en) * | 1995-05-05 | 1996-11-06 | SOLVAY MINERALS, Inc. | Method of deinking wastepaper |
| JP2008536020A (en) * | 2005-04-08 | 2008-09-04 | ナルコ カンパニー | Improved composition and process for papermaking |
| KR101310192B1 (en) * | 2005-04-08 | 2013-09-25 | 날코 컴퍼니 | Improved composition and processes for paper production |
| CN101775749A (en) * | 2010-03-05 | 2010-07-14 | 杨树香 | Deinking, bleaching and treating process of waste paper |
| CN101831825A (en) * | 2010-03-25 | 2010-09-15 | 吉林晨鸣纸业有限责任公司 | Improved production method of waste paper deinking pulp |
| CN103437230A (en) * | 2013-08-29 | 2013-12-11 | 华南理工大学 | Biological enzyme-based process for deinking wastepaper by neutral-alkaline dual-loop flotation |
| CN103437230B (en) * | 2013-08-29 | 2015-10-28 | 华南理工大学 | Based on alkali double loop flotation deinking technique in biology enzyme |
| JP2020172717A (en) * | 2019-04-09 | 2020-10-22 | 大王製紙株式会社 | Method of producing pulp raw material from waste paper |
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