JPS5870788A - Treating agent for regenerating used paper - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 本発明は故紙の再生用処理剤に関し、更に詳細には、炭
酸ナトリウム・過酸化水素付加物を用いて故紙の離解、
漂白を行ない効率的に故紙を再生することに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a treatment agent for recycling waste paper, and more specifically, the present invention relates to a treatment agent for recycling waste paper, and more specifically, it is a treatment agent for disintegrating waste paper using a sodium carbonate/hydrogen peroxide adduct.
Relating to efficient recycling of waste paper by bleaching.

従来、故紙の再生□は、苛性ソー先界面活性剤等の脱墨
剤を用いて離解し、その後熟成、洗浄し、更に次亜塩素
酸塩を用いて漂白する方法が採用されているが、この方
法は上記のように多工程を要し、又、この再生工程から
排出される排水は、高いＣＯ’Ｄを有し排水処理上問題
となる。一方、漂白工程を別個に設けずに、漂白を離解
および熟成工程で同時に行なう方法として、過酸化ソー
ダあるいは過酸化水素を離解時に添加し故紙を再生する
方法も提案されているが、これらの過酸化物は、危険物
あるいは劇物であるため、さらには皮膚や粘膜を強く侵
すため、取扱い上問題がある。Conventionally, waste paper has been recycled by disintegrating it using a deinking agent such as a caustic saw tip surfactant, then aging and washing it, and then bleaching it using hypochlorite. This method requires multiple steps as described above, and the wastewater discharged from this regeneration step has a high CO'D, which poses a problem in wastewater treatment. On the other hand, a method has been proposed in which bleaching is carried out simultaneously in the disintegration and aging processes without a separate bleaching process, in which waste paper is recycled by adding soda peroxide or hydrogen peroxide during disintegration. Oxides pose problems in handling because they are dangerous or deleterious substances, and furthermore, they strongly attack the skin and mucous membranes.

そこで本発明者等は、作業安全性が高く且つ省力的な故
紙の再生処理剤を見出すべく鋭意検討を重ねた結果、本
発明を完成させたものである。Therefore, the present inventors have completed the present invention as a result of intensive studies to find a waste paper recycling agent that is highly safe and labor-saving.

即ち、本発明は、炭酸ナトリウム・過酸化水素付加物（
以下ＰＣと略称する）を主成分、とする故紙の再生用処
理剤である。That is, the present invention provides a sodium carbonate/hydrogen peroxide adduct (
This is a waste paper recycling treatment agent whose main component is PC (hereinafter abbreviated as PC).

ｐｃは化学式Ｎａ２Ｃ６３・３／２Ｈ２０□で示される
固形の過酸化水素付加物であり、その安定性は極めて良
く、又、皮膚刺激性は過酸化水素に比して極めて弱い。PC is a solid hydrogen peroxide adduct represented by the chemical formula Na2C63.3/2H20□, and its stability is extremely good, and its skin irritation is extremely weak compared to hydrogen peroxide.

本発明の処理剤を使用するに際しては、通常用いられる
脱墨剤とともにこれを離解工程に添加して処理すれば故
紙の再生を効率的に行なうことができ、別途に漂白工程
を設ける必要はないが、より高い白色度を希望する場合
Ｊよ、その後、次亜塩素酸塩等で更に漂白すればよい。When using the processing agent of the present invention, it is possible to efficiently recycle waste paper by adding it to the defibration process along with a commonly used deinking agent, and there is no need to provide a separate bleaching process. However, if a higher degree of whiteness is desired, then it may be further bleached with hypochlorite or the like.

ＰＣの添加量は、故紙に対して一般的には０．５〜２．
５ｆｆｌ　７２３％である。又、処理液中でのＰＣの安
定剤として、例えば有機キレート剤１、マグネシウム−
イオン、珪酸塩および各種リン酸塩等を必要に応じて添
加してもよい。The amount of PC added to the waste paper is generally 0.5 to 2.
5ffl 723%. In addition, as a stabilizer for PC in the processing solution, for example, organic chelating agent 1, magnesium-
Ions, silicates, various phosphates, etc. may be added as necessary.

離解処理の温度は通常４０〜６０℃で行なうが、故紙の
種類等によって最適温度は異なる。離解処理に引き続い
て行なわれる熟成処理の温度は、熟成時間によって異な
り、熟成時間を長時間取れる場合は４０〜５０℃ひ行な
うことが出来、比較的短時間しか取れない場合は、６０
〜７０℃といった比較的高い湿度て゛効果的熟成ができ
る。設備的に可能であれば熟成時間を十分に確保した方
が、再生故紙のより高い白色度の向上が期待出来るだけ
でなく、熟成温度を下げることが出来るため、］ネルギ
ーコストが減り経済的利点も大きくなり、好ましい実施
態様となる。The temperature of disintegration treatment is usually 40 to 60°C, but the optimum temperature varies depending on the type of waste paper. The temperature of the ripening treatment that follows the disintegration treatment varies depending on the ripening time; if the ripening time can be taken for a long time, it can be carried out at 40 to 50 degrees Celsius, and if it can be done for a relatively short time, it can be done at 60 degrees Celsius.
Effective ripening can be achieved at a relatively high humidity of ~70°C. If the equipment allows for sufficient aging time, not only can the whiteness of recycled waste paper be expected to be further improved, but the aging temperature can also be lowered, reducing energy costs and providing economic benefits. This is a preferred embodiment.

従来法の熟成工程後のＪｌｌ水は比較的高いＣＯＤを有
しているが、本発明の処理剤を添加した系は、後述する
実施例からも明らかなように、ＣＯＤの流出が抑制され
ている。又、流出するＣＯＤは、難解および熟成温度と
も密接に関連し、その温度が低い方が、流出ＣＯＤが低
くなる−ため好ましい。Jll water after the conventional aging process has a relatively high COD, but in the system to which the treatment agent of the present invention is added, the outflow of COD is suppressed, as is clear from the examples described below. There is. Furthermore, the COD that flows out is closely related to the refractory and ripening temperature, and the lower the temperature, the lower the COD that flows out, which is preferable.

上述したごとき本発明の故紙再生用処理剤は処理工程の
簡素化が計れる、ＣＯＤの流出を抑制出来る、離解が促
進される、使用薬品自体の危険性および刺激性が少ない
ために取扱いが安全かつ便利である、更に好ましい態様
で実施すればエネルギーを節約できる等といった多（の
利点を有しており、産業上極めて有利なものである。The treatment agent for waste paper recycling of the present invention as described above simplifies the treatment process, suppresses the outflow of COD, promotes disintegration, and the chemicals used themselves are less dangerous and irritating, making them safe and easy to handle. It has many advantages such as being convenient and, if implemented in a preferred manner, can save energy, etc., and is extremely advantageous industrially.

以下に本発明を実施例により′詳しく説明する。The present invention will be explained in detail below using examples.

実施例 ７：３の割合（重量比）で模造および色土故紙を均一に
混合し、更に第１表に示した各種薬品の所要量を添加し
、常温で３分間ミキサーで離解処理した（故紙濃度３．
５％）。その後、故紙濃度を２０％に調整し、ポリ袋に
入れて４０および６０℃の恒温槽に２４Ｒ間浸漬し熟成
させた。熟成終了後ｐＨ，ＣＯＤ’および白色度を測定
した。Example 7: Imitation and colored waste paper were mixed uniformly at a ratio (weight ratio) of 3, the required amounts of various chemicals shown in Table 1 were added, and the disintegration treatment was carried out in a mixer for 3 minutes at room temperature (waste paper Concentration 3.
5%). Thereafter, the waste paper concentration was adjusted to 20%, and the waste paper was placed in a plastic bag and immersed in a constant temperature bath at 40 and 60° C. for 24R to age. After completion of aging, pH, COD' and whiteness were measured.

白色度は、絶乾故紙１０（＋に対４して水通水１立を用
い１００メツシｌのワイヤーで６回濾過洗浄を行なった
のち測定した。表中の数値は、ハンター白色度系で各２
枚づつのシート白色度を測定したときの平均値である。The whiteness was measured after filtering and cleaning six times with a 100 mesh liter wire using bone dry waste paper 10 (4 to 4 to 1 water flow).The values in the table are based on the Hunter whiteness system. 2 each
This is the average value when the whiteness of each sheet is measured.

尚、実験Ｎｏ、１　、Ｎｏ、４及Ｎｏ、’５については
、熟成処理に引き続き次亜塩素酸カルシウム漂白を行な
った。漂白条件は、常温、８１度５％、５時間Ｃあり、
その後２回洗浄し白色度を測定した。For experiments No. 1, No. 4, and No. '5, calcium hypochlorite bleaching was performed subsequent to the aging treatment. Bleaching conditions are room temperature, 81 degrees 5%, and C for 5 hours.
Thereafter, it was washed twice and its whiteness was measured.

各種結果をそれぞれ第１表に示す。尚、ＰＣとしては有
効酸素１０，５％のものを使用した。第１表に示ず各秒
添加薬品の濃度は対故紙の重量％である。但し、次亜塩
素酸カルシウムは有効塩素の対故紙ｆｆ１ｆｆｉ％であ
る。The various results are shown in Table 1. The PC used was one containing 10.5% effective oxygen. The concentration of the chemicals added each second, which are not shown in Table 1, is expressed in weight percent of the waste paper. However, the amount of available chlorine in calcium hypochlorite is ff1ffi% of the waste paper.

Claims (1)

【特許請求の範囲】[Claims] １、炭酸ナト、リウム・過酸化水素付加物を主成分とす
る故紙の再生用処理剤。1. A waste paper recycling treatment agent whose main components are sodium carbonate, lithium and hydrogen peroxide adducts.