JP2013044053A - Method for producing deinked waste paper pulp - Google Patents
Method for producing deinked waste paper pulp Download PDFInfo
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Abstract
Description
本発明は、工業用水の使用量を少なくした古紙脱墨パルプの製造方法に関するものである。 The present invention relates to a method for producing waste paper deinked pulp in which the amount of industrial water used is reduced.
近年、地球資源保護の観点から古紙を再生した再生紙の需要が伸びてきている。これに応えるために良好な品質の古紙脱墨パルプを製造することが課題となっている。
製紙工場にとって、水は人間の血液に例えられるほどの重要性がある。水はパルプを運ぶ媒体であり、抄紙機における地合形成にも不可欠であり、大量の水が消費される。紙パルプ工業の工業用水（清水）使用量は、平均的に重量で生産量の４０〜１００倍程度である。製紙工場では、用水の循環使用は常識となっているが、循環使用を増やすと、工程内にピッチや菌類が増えて、ピッチやスライムによる異物のトラブルが発生する。よって用水を処理する必要が生じるが、循環使用をむやみに増やすと処理費用の増大を招く。したがって、確保できる工業用水の量や、用水の循環使用にかかる費用などを考慮して、各工程の設計、運用が行われている。
In recent years, the demand for recycled paper made from recycled paper has been increasing from the viewpoint of protecting global resources. In order to meet this demand, it has been a challenge to produce good quality waste paper deinked pulp.
For paper mills, water is as important as human blood. Water is a medium for carrying pulp and is essential for formation in paper machines, and a large amount of water is consumed. The amount of industrial water (fresh water) used in the pulp and paper industry is about 40 to 100 times the production amount by weight on average. In paper mills, it is common knowledge to circulate and use water. However, if the circulation is increased, pitches and fungi increase in the process, and foreign matter trouble due to pitch and slime occurs. Therefore, it becomes necessary to treat the water, but if the circulation use is increased unnecessarily, the treatment cost increases. Therefore, each process is designed and operated in consideration of the amount of industrial water that can be secured and the cost of circulating water for use.
近年、気象変動の影響か、渇水問題の頻度が増しており、節水時にも減産することなく製品を安定供給できる、工程の設計、運用が必要となっている。
製紙工場のなかでも、古紙脱墨パルプの製造工程は、パルプ繊維とインクを分離する工程であり、パルプの希釈と濃縮を繰り返すため、大量の用水が必要となる。その際にも、清水の使用量を極力少なくする必要がある。用水の循環使用については、次のような意義がある。
（１）工業用水の使用量を削減し、工業用水にかかる費用を下げる。
（２）排水量を削減し、流失原料を少なくする。
（３）循環水の持つ熱量を有効利用することにより、パルプの濃縮等の負荷を下げる。
（４）工業用水の代わりに循環水を使用することで、微細繊維や填料の回収率が向上することに加え、紙の地合いが向上する。
In recent years, the frequency of drought problems has increased due to weather fluctuations, and it is necessary to design and operate processes that can stably supply products without reducing production even when water is saved.
Among paper mills, the process for producing waste paper deinked pulp is a process of separating pulp fibers and ink, and a large amount of water is required to repeat the dilution and concentration of the pulp. At that time, it is necessary to reduce the amount of fresh water used as much as possible. The circulation of water for use has the following significance.
(1) Reduce the amount of industrial water used and reduce the cost of industrial water.
(2) Reduce the amount of wastewater and reduce the amount of raw material lost.
(3) By effectively using the heat quantity of the circulating water, the load such as pulp concentration is reduced.
(4) By using circulating water instead of industrial water, the recovery rate of fine fibers and fillers is improved, and the texture of paper is improved.
古紙脱墨パルプの製造では、古紙に含まれる、印刷されたインクと紙に含まれる填料や塗工紙の塗料に含まれる顔料、接着剤が除去されるので、歩留りは６０〜８５％程度で、残りは除去される成分であり、除去の際に多くの用水が必要である。古紙脱墨パルプ製造の各工程から排出される水としては、脱墨工程で浮上選別される脱墨工程排水や、精選、脱水、濃縮、洗浄などの工程で排出される水がある。このような水は、通常、処理せずそのまま上流工程で使用されたり、必要により、加圧浮上処理や浮選処理されて再使用される。
特許文献１には、古紙パルプ製造工程で排出される排水の処理方法、特に脱墨工程から排出される排水の処理方法について開示されている。非特許文献１には、古紙脱墨パルプの製造方法における白水処理と、新聞古紙脱墨パルプの白水ループ例が記載されている。しかし、いずれも、工程水の種類分けや処理、再利用については詳細には開示されていない。
In the production of waste paper deinked pulp, the printed ink and the filler contained in the paper, the pigment and the adhesive contained in the paint of the coated paper are removed, so the yield is about 60-85% The remainder is a component to be removed, and a large amount of water is required for removal. Examples of water discharged from each process of waste paper deinking pulp production include deinking process drainage that is floated and selected in the deinking process, and water discharged in processes such as selection, dehydration, concentration, and washing. Such water is usually used as it is in an upstream process without being treated, or is reused after being subjected to a pressure flotation treatment or a flotation treatment as necessary.
Patent Document 1 discloses a method for treating wastewater discharged in the waste paper pulp manufacturing process, particularly a method for treating wastewater discharged from the deinking process. Non-Patent Document 1 describes an example of white water treatment in a method for producing waste paper deinked pulp and a white water loop of newspaper waste paper deinked pulp. However, none of the process water classification, treatment, and reuse is disclosed in detail.
本発明の課題は、工業用水の使用量を少なくすることができる古紙脱墨パルプ製造方法を提供することである。 The subject of this invention is providing the used paper deinking pulp manufacturing method which can reduce the usage-amount of industrial water.
本発明者は、古紙脱墨パルプ製造工程における、工程水の種類分けや処理、再利用について特定することで、清水の使用量を削減しながら、品質の良好な古紙脱墨パルプを得ることができることを見出した。 The present inventor is able to obtain used paper deinked pulp of good quality while reducing the amount of fresh water used by specifying the classification, processing, and reuse of process water in the used paper deinked pulp manufacturing process. I found out that I can do it.
請求項１に係る発明は、
（１）少なくとも、離解、脱墨、精選、濃縮、分散、第二脱墨、第二精選の各工程をこの順に含む、古紙脱墨パルプの製造方法において、工程内で使用する用水を、清水と少なくとも４種類の工程水に分け、工程水のうち、ＳＳ濃度のより少ない工程水を、より下流工程の工程水として使用することを特徴とする古紙脱墨パルプの製造方法。である。
請求項２に係る発明は、
（２）工程水の少なくとも一種を加圧浮上処理して工程内で循環使用することを特徴とする（１）に記載の古紙脱墨パルプの製造方法。である。
請求項３に係る発明は、
（３）工程水を加圧浮上処理する処理量が、古紙脱墨パルプ製造工程の工程外から供給される用水の合計量の５０〜９０％であり、清水の使用原単位が１０Ｔ／ＢＤＴ以下であることを特徴とする（２）に記載の古紙脱墨パルプの製造方法。である。
The invention according to claim 1
(1) In the method for producing waste paper deinked pulp, which includes at least the steps of disaggregation, deinking, selection, concentration, dispersion, second deinking, and second selection in this order, the water used in the process is fresh water. And at least four types of process water, and among the process water, process water having a lower SS concentration is used as process water for the downstream process. It is.
The invention according to claim 2
(2) The method for producing waste paper deinked pulp according to (1), wherein at least one kind of process water is subjected to pressure levitation treatment and recycled in the process. It is.
The invention according to claim 3
(3) The processing amount of the process water subjected to pressure levitation treatment is 50 to 90% of the total amount of water supplied from outside the process of the used paper deinked pulp manufacturing process, and the basic unit of use of fresh water is 10 T / BDT or less (2) The method for producing waste paper deinked pulp according to (2). It is.
本発明の古紙脱墨パルプの製造方法によれば、工業用水使用量の削減、歩留りの向上、節水時の対応が容易になる。 According to the method for producing waste paper deinked pulp of the present invention, it is easy to reduce the amount of industrial water used, improve the yield, and cope with water saving.
以下、本発明の実施の形態を説明する。
（古紙脱墨パルプの製造工程）
古紙脱墨パルプの製造工程が、どのような処理からなるかは、特に限定されない。一般には、古紙を、パルパー等の機械的解繊を伴う離解装置でスラリーとし（離解処理）、スクリーンやクリーナー等の除塵装置で異物を除去し（粗選・精選処理）、必要に応じて過酸化水素等で漂白し（漂白処理）、フローテーター等の浮選機で微細繊維やインキ成分等を浮上選別し（浮選処理）、洗浄処理、脱水処理するなどして、古紙脱墨パルプを製造している。もちろん、例えば、浮選処理を多段としたり、一連の処理の途中でニーディング（混練）処理やディスパージョン（分散）を行う場合もある。
Embodiments of the present invention will be described below.
(Manufacturing process of waste paper deinked pulp)
There is no particular limitation on what kind of processing the manufacturing process of waste paper deinked pulp comprises. In general, waste paper is made into a slurry (pulverization process) using a pulping machine or other mechanical defibration apparatus (disaggregation process), and foreign matter is removed using a dust removal apparatus such as a screen or a cleaner (coarse / selection process). Bleaching with hydrogen oxide (bleaching), flotation and sorting fine fibers and ink components with a flotation machine such as a floatator (flotation processing), washing, dewatering, etc. Manufacture. Of course, for example, the flotation process may be performed in multiple stages, or the kneading (kneading) process or the dispersion (dispersion) may be performed during a series of processes.
次に各工程の作用と設備について説明する。
（離解：パルパー）
受け入れた古紙を、パルパーでバラバラに解されたパルプ繊維状態にする。離解する際のパルプ濃度に限定は無いが、パルパーには、低濃度パルパー（濃度３〜５％）と高濃度パルパー（濃度１３〜１８％）、ドラムパルパー（濃度１３〜２５％）がある。必要に応じ、パルパーには、古紙と同時にアルカリ薬品（水酸化ナトリウム、ケイ酸ナトリウム）、脱墨剤、過酸化水素などが添加される。アルカリ薬品は、インキ被膜に作用し、けん化、加水分解しインキを分離させ、繊維を膨潤化させインキや異物の分離を促進する働きがある。
Next, the operation and equipment of each process will be described.
(Disaggregation: Pulper)
The accepted used paper is made into a pulp fiber state that has been broken apart by a pulper. The pulp concentration at the time of disaggregation is not limited, but the pulper includes a low-concentration pulper (concentration 3 to 5%), a high-concentration pulper (concentration 13 to 18%), and a drum pulper (concentration 13 to 25%). If necessary, alkaline chemicals (sodium hydroxide, sodium silicate), deinking agents, hydrogen peroxide, and the like are added to the pulper at the same time as the waste paper. Alkaline chemicals act on the ink film and have a function of saponifying and hydrolyzing to separate the ink and swelling the fibers to promote separation of the ink and foreign matters.
（粗選・精選、除塵：クリーナー、スクリーン）
除塵工程には、古紙離解後の粗大異物除去を目的とする粗選工程と、完成パルプの品質を達成するレベルまで異物を除去する精選工程がある。
パルパーを出た原料は、まず重量異物を除去する高濃度クリーナー（濃度３〜４％）で、砂、金属などを分離し、排出する。次いで粗選スクリーン（濃度１．５〜４％）で紐や大きい粘着異物を除去する。精選スクリーンは、処理濃度は１．０〜１．５％程度であるが、フローテーターの前段に設置する場合は、設備の小型化、経済性を考慮し比較的高濃度（１．５〜２％）で処理する場合がある。スクリーンには、丸孔スクリーン（１．０〜７．０ｍｍφ）とスリットスクリーン（０．１３〜０．４０ｍｍ幅）がある。
クリーナーは渦流によって生じる繊維と異物の比重差によって異物を選別し、スクリーンでは除去しにくい細かい砂、金属などの重量異物やホットメルト、ポリ紐などの軽量異物の除去を行う。クリーナーは低濃度のほうが異物除去効率が高く、通常１％前後の濃度である。
(Coarse selection / selection, dust removal: cleaner, screen)
The dust removal process includes a rough selection process for removing coarse foreign matters after disintegration of used paper and a fine selection process for removing foreign substances to a level that achieves the quality of the finished pulp.
The raw material that has come out of the pulper is first separated and discharged by a high-concentration cleaner (concentration 3 to 4%) that removes heavy foreign substances. Next, the string and large adhesive foreign matter are removed with a coarse screen (concentration 1.5 to 4%). The treatment screen has a processing concentration of about 1.0 to 1.5%. However, when it is installed at the front stage of the floatator, it is relatively high concentration (1.5 to 2) in consideration of downsizing of the equipment and economy. %) May be processed. There are round screens (1.0 to 7.0 mmφ) and slit screens (0.13 to 0.40 mm width).
The cleaner sorts the foreign matter by the difference in specific gravity between the fiber and the foreign matter generated by the vortex, and removes heavy foreign matter such as fine sand and metal that are difficult to remove with a screen, and lightweight foreign matters such as hot melt and poly string. The cleaner has a higher foreign substance removal efficiency at a low concentration, and the concentration is usually around 1%.
（漂白・熟成）
熟成処理は未剥離インキを低減する効果があり、通常粗選スクリーンもしくは前段精選スクリーンの後にあり要求によっては分散工程の直後に設置する。熟成がアルカリ条件下であることから、過酸化水素漂白も兼用し、アルカリと同時に過酸化水素およびケイ酸ナトリウムを添加する。パルプ濃度が高いほど薬品の効果が高いとされており、中濃度漂白の場合１３〜２０％程度、高濃度漂白の場合２５〜３０％程度である。
(Bleaching / Aging)
The ripening treatment has the effect of reducing the unpeeled ink, and is usually placed after the coarse selection screen or the pre-screening screen, and immediately after the dispersion step depending on demand. Since aging is under alkaline conditions, hydrogen peroxide bleaching is also used, and hydrogen peroxide and sodium silicate are added simultaneously with alkali. The higher the pulp concentration, the higher the chemical effect. In the case of medium concentration bleaching, it is about 13 to 20%, and in the case of high concentration bleaching, it is about 25 to 30%.
（浮選:フローテーター）
脱墨を行うフローテーターはパルプスラリー中に空気の泡を送り込んで、疎水性のインキ粒子を泡表面に吸着させ、工程外へ除去する。フローテーターでのパルプ濃度は０．８〜１．５％程度である。
(Flotation: Flotator)
The flotator that performs deinking sends air bubbles into the pulp slurry, adsorbs hydrophobic ink particles to the surface of the bubbles, and removes them outside the process. The pulp concentration in the flotator is about 0.8 to 1.5%.
（混練・分散：ニーダー、ディスパーザー）
機械的な力でインキを剥離する、混練や分散を行う。インキの剥離のほか、インキをフローテーターで除去しやすい粒径にしたり、黒染繊維の減少に効果がある。濃度は２０〜３５％程度である。
(Kneading / dispersing: kneader, disperser)
Kneading and dispersing are performed by peeling the ink with mechanical force. In addition to ink peeling, it is effective in making the particle size easy to remove with a floatator and reducing black dyed fibers. The concentration is about 20 to 35%.
（白水処理：フローテーター・加圧浮上機）
工程内で発生する洗浄機や脱水機のろ液は、系内各工程の希釈に用いられ、余剰分は排水として排水処理設備にて処理される。古紙脱墨パルプの系内白水には、微細インキや灰分、マイクロスティッキーなどの異物が混入しているため、白水を回収することは、これらを系内に再び取り込むことになり、完成パルプの品質低下や薬品使用量の増加を招く。以前からフローテーターを用いた白水フローテーションを導入しているが、近年では、微細異物やアニオン・カチオン類を除去するため、加圧浮上装置を用いて、白水の浄化を図っている。フローテーターは粘着異物・インキ・灰分除去が可能であり、加圧浮上機より繊維ロスが少ない。加圧浮上機は入口固形分の８０〜９０％を除去することが可能で、粘着異物・インキ・灰分の除去には有効である。ただし繊維ロスは大きい。
本発明の古紙脱墨パルプの製造方法の原料に使用する古紙としては、新聞、チラシ、雑誌、色上、ケントなどに分類される古紙を目的とするパルプの品質に合わせて使用することができる。
(White water treatment: Flotator / Pressure levitation machine)
The filtrate of the washer and dehydrator generated in the process is used for dilution of each process in the system, and the surplus is processed as wastewater in a wastewater treatment facility. The white water in the waste paper deinked pulp contains foreign matter such as fine ink, ash, and microsticky, so recovering the white water will re-incorporate these into the system, resulting in the quality of the finished pulp. It causes a decrease and an increase in chemical usage. In the past, white water flotation using a floatator has been introduced, but in recent years, white water has been purified using a pressure levitation device in order to remove fine foreign substances and anions and cations. The floatator can remove adhesive foreign matter, ink, and ash, and has less fiber loss than a pressure flotation machine. The pressure levitation machine can remove 80 to 90% of the solid content at the inlet, and is effective in removing adhesive foreign matter, ink, and ash. However, fiber loss is large.
The used paper used as a raw material for the method for producing waste paper deinked pulp of the present invention can be used in accordance with the quality of pulp intended for used paper classified as newspaper, flyer, magazine, color, Kent, etc. .
本願発明の古紙脱墨パルプの製造方法は、少なくとも、離解、脱墨、精選、濃縮、分散、第二脱墨、第二精選の各工程をこの順に含む、古紙脱墨パルプの製造方法において、工程内で使用する用水を、清水と少なくとも４種類の工程水に分け、工程水のうち、ＳＳ濃度のより少ない工程水を、より下流工程の工程水として使用することを特徴とする。
本発明では、古紙脱墨パルプ製造工程における、工程水を、ＳＳ濃度の大小により、少なくとも４種類に分割し、各工程の希釈水として使用する。その際、工程水のＳＳ濃度により、ＳＳ濃度の小さい工程水を、古紙脱墨パルプの製造工程の下流工程、すなわちより洗浄度の高い工程の希釈水として使用する。
前述した工程水の種類としては、工程水を一時的に貯留する専用のタンクやチェスト等を有していることが必要であり、工程間を移動するだけの水は工程水の種類に入れない。
なお、清水は、ポンプのシール水、洗浄濃縮機のシャワー水や冷却水などに使用するのが望ましい。これらの箇所に使用する水質が悪いと、詰まりを起こしやすいためである。清水はパルプの希釈には使用しないのが清水の使用量を抑えることができるので望ましい。
The method for producing waste paper deinked pulp of the present invention comprises at least the steps of disaggregation, deinking, selection, concentration, dispersion, second deinking, and second selection in this order, The water used in the process is divided into clean water and at least four types of process water, and the process water having a lower SS concentration is used as process water in the downstream process.
In the present invention, in the waste paper deinked pulp manufacturing process, the process water is divided into at least four types according to the SS concentration and used as dilution water in each process. At that time, the process water having a small SS concentration is used as the dilution water in the downstream process of the waste paper deinked pulp manufacturing process, that is, the process having a higher degree of cleaning, depending on the SS concentration of the process water.
As the type of process water described above, it is necessary to have a dedicated tank or chest for temporarily storing process water, and water that only moves between processes cannot be included in the type of process water. .
In addition, it is desirable to use fresh water for sealing water for pumps, shower water for cooling concentrators, cooling water, and the like. This is because clogging is likely to occur if the water quality used in these places is poor. It is desirable not to use fresh water for pulp dilution because the amount of fresh water used can be reduced.
工程水のＳＳ濃度は、最も低い工程水１で３００〜５００ｐｐｍ、最も高い工程水４で１０００〜２０００ｐｐｍ程度である。
種水の流量と白水の処理量を調整し、各工程水の余剰分は、それより一段ＳＳ濃度の高い工程水に供給され、系内の流量バランスが保たれる。
工程水の種類が少ないと、脱墨効率の低下による異物混入、白色度の低下、薬品費の増加を起こすことがあり、これを防ぐには、清水の使用量が多くなってしまう。
工程水を、４種類より多くしても、工程が複雑になり、操業管理が難しくなるだけで、清水の使用量削減やパルプの品質向上は見込めない。
The SS concentration of process water is about 300 to 500 ppm for the lowest process water 1 and about 1000 to 2000 ppm for the highest process water 4.
The flow rate of the seed water and the amount of white water treated are adjusted, and the surplus amount of each process water is supplied to the process water having a higher SS concentration, thereby maintaining the flow rate balance in the system.
When there are few kinds of process water, foreign matter contamination due to a decrease in deinking efficiency, a decrease in whiteness, and an increase in chemical costs may occur. To prevent this, the amount of fresh water used is increased.
Even if the amount of process water is more than four, the process becomes complicated and the operation management becomes difficult, and the amount of fresh water used cannot be reduced and the quality of pulp cannot be improved.
古紙脱墨パルプ製造工程の工程外から供給される用水（種水）としては、清水（工業用水）、抄紙機で発生する余剰白水、排水処理設備で処理した再生水などが挙げられる。 Examples of water (seed water) supplied from outside the waste paper deinked pulp manufacturing process include fresh water (industrial water), surplus white water generated by a paper machine, and recycled water treated by a wastewater treatment facility.
本願発明の古紙脱墨パルプの製造方法は、工程水の少なくとも一種を処理して工程内で循環使用することを特徴とする。
本発明の古紙脱墨パルプの製造方法では、白水処理により、ＳＳ濃度１０００〜２０００ｐｐｍの工程水を処理しＳＳ濃度３００〜１０００ｐｐｍの処理水を得る。
工程水の処理方法としては、加圧浮上処理を行うのが望ましい。
加圧浮上処理により、ＳＳ分とアニオン・カチオン類を除去することができる。また、加圧浮上処理によれば、パルプ繊維の流失が少ないため、歩留りが良くなる。
加圧浮上処理とは、加圧によって多量の空気を白水中に溶解させ、次いで大気圧に戻すことによって排水中に気泡を発生させ、気泡に懸濁物質を付着させて浮上させ、この浮上物（スカム）を除去する処理方法である。
The method for producing waste paper deinked pulp of the present invention is characterized in that at least one kind of process water is treated and recycled in the process.
In the method for producing waste paper deinked pulp of the present invention, process water having an SS concentration of 1000 to 2000 ppm is treated by white water treatment to obtain treated water having an SS concentration of 300 to 1000 ppm.
As a process water treatment method, it is desirable to perform a pressure levitation treatment.
The SS component and anions / cations can be removed by the pressure levitation treatment. In addition, according to the pressure levitation treatment, the yield of the pulp fiber is reduced because the pulp fiber is less lost.
Pressurized flotation treatment involves dissolving a large amount of air in white water by pressurization and then returning to atmospheric pressure to generate bubbles in the drainage, causing suspended solids to adhere to the bubbles, and then floating. This is a processing method for removing (scum).
一般に、浮上処理の方法としては、加圧式のほか、例えば、散気管式等がある。しかしながら、加圧式の方が、排水中に残留する界面活性剤を発泡させ易いため、懸濁物質を効率的に浮上させることができるという点で好ましい。 In general, as a method of levitation treatment, for example, there is an air diffuser type in addition to a pressure type. However, the pressurization type is preferable in that the surfactant remaining in the waste water can be easily foamed, so that suspended substances can be efficiently levitated.
このような、白水処理の工程を一系統あるいは複数設けてもよい。
なお、白水処理による処理量は、古紙脱墨パルプ製造工程の工程外から供給される用水の合計量の５０〜９０％とするのが望ましい。処理量が９０％より多いと、循環量が増え、動力が大きくなる。ＳＳ濃度の高い再生水の比率が高くなるため、ＳＳ除去率を上げる必要が出てきて、コスト増になる。処理量が５０％より少ないと、処理水の入るピットを空にさせないため、かわりになる水の使用量が増えるため、清水の使用量が増えることになる。
このようにすることで清水の使用量が少なくても異物が少なく品質の良い古紙脱墨パルプを製造することができ、清水の使用原単位が１０Ｔ／ＢＤＴ（製造された絶乾古紙脱墨パルプ）以下とすることができる。
One or more such white water treatment steps may be provided.
In addition, as for the processing amount by a white-water process, it is desirable to set it as 50 to 90% of the total amount of the water supplied from the outside of a used paper deinking pulp manufacturing process. When the processing amount is more than 90%, the circulation amount increases and the power increases. Since the ratio of reclaimed water with a high SS concentration increases, it becomes necessary to increase the SS removal rate, which increases costs. If the treatment amount is less than 50%, the pits into which the treated water enters are not emptied, and the amount of water used instead increases, so the amount of fresh water used increases.
By doing so, it is possible to produce high quality waste paper deinked pulp with little foreign matter even if the amount of fresh water used is small, and the basic unit of clean water used is 10T / BDT (produced absolutely dry waste paper deinked pulp ) Can be:
古紙脱墨パルプの製造工程において、離解工程における離解性や、脱水工程における脱水性は、温度が高いほうが良くなるので、蒸気で加温している場合があり、特に古紙を離解する離解工程は大量の希釈水を用いており、加温するには多くの熱量が必要である。清水の使用量を少なくすることにより、工程水の温度を高くすることができるので、加温のための熱量を減らすことができるので省エネにつながる。 In the manufacturing process of waste paper deinked pulp, the higher the temperature, the better the disaggregation process in the disaggregation process and the dehydration process in the dehydration process, so it may be heated with steam, especially the disaggregation process to disaggregate used paper A large amount of dilution water is used, and a large amount of heat is required for heating. By reducing the amount of fresh water used, the temperature of the process water can be raised, so the amount of heat for heating can be reduced, leading to energy saving.
本発明の古紙脱墨パルプの製造方法において、清水は、詰りの問題が発生しやすい、ポンプのシール水や、洗浄濃縮機のシャワー水、あるいは、各種冷却水として用いるだけで、パルプの希釈水としての使用を無しにするとよい。このように、清水の使用量が少ないと、工程水の温度を高くすることができるので、脱墨効果や脱水効率が良くなるというメリットがある。
フローテーターから排出されるリジェクト分は灰分除去装置を用いてパルプ繊維を回収するのが望ましい。灰分除去装置としては、置換洗浄を行う装置を用いるのが望ましい。
このようにすることで、清水の使用量を少なくしながら、パルプの歩留りを下げずに、異物の少ない品質の良い古紙脱墨パルプを製造することができる。
In the method for producing waste paper deinked pulp of the present invention, fresh water is prone to clogging problems, and it can be used as pump sealing water, washing concentrator shower water, or various cooling water. It is good to eliminate the use as. In this way, when the amount of fresh water used is small, the temperature of the process water can be increased, so that there is an advantage that the deinking effect and dewatering efficiency are improved.
It is desirable to recover the pulp fiber from the reject discharged from the floatator using an ash removal device. As the ash removal device, it is desirable to use a device that performs displacement cleaning.
By doing so, it is possible to produce a good quality used paper deinked pulp with less foreign matter, while reducing the amount of fresh water used and without lowering the yield of the pulp.
次に本願発明の古紙脱墨パルプの製造方法の具体例を示す。 Next, the specific example of the manufacturing method of the waste paper deinked pulp of this invention is shown.
実施例１の古紙脱墨パルプ製造工程は、順に、離解、脱墨、精選、濃縮、分散、第二脱墨、第二精選、第二濃縮、漂白の各工程から成る。
工程水はＳＳ濃度の低い順に工程水１〜４の４つに分けている。
工程水４は離解工程、工程水３は脱墨工程、工程水２は精選工程、工程水１は第二脱墨工程と第二精選工程の希釈水にそれぞれ用いられる。そして工程水３は加圧浮上処理を行い、工程水１に供給されている。濃縮工程のろ液は工程水３と工程水２に補給される。第二濃縮工程のろ液は工程水１に補給される。
清水チェストの余剰分は工程水１へ供給される。工程水１の余剰分は工程水２へ、工程水２の余剰分は工程水３へ供給される。工程水４は離解工程の希釈水に使用するため加温しており、余剰分は系外へ排出せず工程水３へ供給され、工程水３の余剰分が系外へ排出される。
種水として、清水と再生水が清水チェストへ供給され、抄紙白水が工程水１へ供給される。
加圧浮上処理による処理量は、工程外から供給される用水の合計量の７７％としており、清水の使用原単位は５Ｔ／ＢＤＴである。
The waste paper deinking pulp manufacturing process of Example 1 includes, in order, disaggregation, deinking, selection, concentration, dispersion, second deinking, second selection, second concentration, and bleaching.
The process water is divided into four process waters 1 to 4 in ascending order of SS concentration.
The process water 4 is used as a disaggregation process, the process water 3 is used as a deinking process, the process water 2 is used as a selection process, and the process water 1 is used as dilution water in the second deinking process and the second selection process. Then, the process water 3 is subjected to a pressure levitation process and is supplied to the process water 1. The filtrate of the concentration process is supplied to process water 3 and process water 2. The filtrate of the second concentration process is supplied to process water 1.
The surplus of the fresh water chest is supplied to the process water 1. The surplus of process water 1 is supplied to process water 2 and the surplus of process water 2 is supplied to process water 3. The process water 4 is heated for use as dilution water in the disaggregation process, and the surplus is not discharged out of the system but supplied to the process water 3, and the surplus of the process water 3 is discharged out of the system.
As seed water, fresh water and recycled water are supplied to the fresh water chest, and papermaking white water is supplied to the process water 1.
The treatment amount by the pressure levitation treatment is 77% of the total amount of water supplied from outside the process, and the basic unit of use of fresh water is 5T / BDT.
実施例２の古紙脱墨パルプ製造工程は、順に、離解、脱墨、精選、濃縮、分散、第二脱墨、第二精選、第二濃縮、漂白の各工程から成る。
工程水はＳＳ濃度の低い順に工程水１〜４の４つに分けている。
工程水４は離解工程と脱墨工程、工程水３は精選工程と第二脱墨工程、工程水１は第二精選工程の希釈水にそれぞれ用いられる。そして工程水２は加圧浮上処理を行い、工程水１に供給されている。濃縮工程のろ液は工程水４と工程水３に補給される。第二濃縮工程のろ液は工程水２に補給される。
清水チェストの余剰分は工程水１へ供給される。また、各工程水の余剰分は、ＳＳ濃度が一段階高い工程水へ補給される。すなわち、工程水１の余剰分は工程水２へ、工程水２の余剰分は工程水３へ、工程水３の余剰分は工程水４へ供給される。工程水４の余剰分は系外へ排出される。
種水として、清水が清水チェストへ供給され、抄紙白水が工程水２へ供給され、再生水が工程水１へ供給される。
加圧浮上処理による処理量は、工程外から供給される用水の合計量の７５％としており、清水の使用原単位は８Ｔ／ＢＤＴである。
The waste paper deinking pulp manufacturing process of Example 2 is composed of the steps of disaggregation, deinking, selection, concentration, dispersion, second deinking, second selection, second concentration, and bleaching in order.
The process water is divided into four process waters 1 to 4 in ascending order of SS concentration.
The process water 4 is used for the disaggregation process and the deinking process, the process water 3 is used for the fine selection process and the second deinking process, and the process water 1 is used for the dilution water of the second fine selection process. Then, the process water 2 is subjected to pressure levitation treatment and is supplied to the process water 1. The filtrate of the concentration process is supplied to process water 4 and process water 3. The filtrate of the second concentration process is supplied to process water 2.
The surplus of the fresh water chest is supplied to the process water 1. Moreover, the surplus of each process water is replenished to the process water whose SS concentration is one step higher. That is, the surplus of process water 1 is supplied to process water 2, the surplus of process water 2 is supplied to process water 3, and the surplus of process water 3 is supplied to process water 4. The surplus of process water 4 is discharged out of the system.
As seed water, fresh water is supplied to the fresh water chest, papermaking white water is supplied to the process water 2, and reclaimed water is supplied to the process water 1.
The treatment amount by the pressure levitation treatment is 75% of the total amount of water supplied from outside the process, and the basic unit of use of fresh water is 8T / BDT.
本発明の古紙脱墨パルプ製造工程によれば、清水の使用量を減らすことができ、実質的に清水を使用せずに、古紙脱墨パルプを製造することが可能である。 According to the used paper deinked pulp manufacturing process of the present invention, the amount of fresh water used can be reduced, and it is possible to manufacture used paper deinked pulp substantially without using fresh water.
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