JPH0723600B2 - Cleaning method for scales containing aluminum silicate as a main component in paper pulp manufacturing process - Google Patents
Cleaning method for scales containing aluminum silicate as a main component in paper pulp manufacturing processInfo
- Publication number
- JPH0723600B2 JPH0723600B2 JP32259889A JP32259889A JPH0723600B2 JP H0723600 B2 JPH0723600 B2 JP H0723600B2 JP 32259889 A JP32259889 A JP 32259889A JP 32259889 A JP32259889 A JP 32259889A JP H0723600 B2 JPH0723600 B2 JP H0723600B2
- Authority
- JP
- Japan
- Prior art keywords
- scale
- aluminum silicate
- main component
- containing aluminum
- manufacturing process
- 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.)
- Expired - Lifetime
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
Landscapes
- Paper (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は紙パルプ製造工程に生成するケイ酸アルミニウ
ムを主成分とするスケールの洗浄方法に関する。TECHNICAL FIELD The present invention relates to a method for cleaning a scale containing aluminum silicate as a main component produced in a paper pulp manufacturing process.
製紙工程においては、サイズ剤、染料等をはじめとする
各種薬品のパルプ繊維上への定着や、歩留り、濾水向
上、あるいはピッチコントロールを目的として硫酸バン
ドを多量に添加している。硫酸バンドは、それが存在す
る白水のpH条件によって種々の形態のアルミナ種を形成
し、一般的な白水pHである４〜５においては一部は３価
のアルミニウムイオンもしくは水溶性のアルミナ種とし
て存在する。これらは高pH原料の混合等によるpH上昇に
より水酸化アルミニウムとなって装置表面上に析出し、
その結晶成長の過程で水中のケイ酸イオを取り込んで種
々のAl2O2/SiO2比のケイ酸アルミニウムスケールを形成
する。In the papermaking process, a large amount of sulfuric acid band is added for the purpose of fixing various chemicals such as sizing agents, dyes, etc. on pulp fibers, improving yield, drainage, or controlling pitch. The sulfuric acid band forms various types of alumina species depending on the pH condition of white water in which it is present, and at a general white water pH of 4 to 5, a part of trivalent aluminum ions or water-soluble alumina species is formed. Exists. These become aluminum hydroxide due to pH increase due to mixing of high pH raw materials, etc., and are deposited on the equipment surface,
In the process of crystal growth, silicate io in water is taken in to form aluminum silicate scales with various Al 2 O 2 / SiO 2 ratios.
同様のケイ酸アルミニウムを主成分とするスケールは脱
墨パルプ製造工程においても生成する。この場合は、古
紙中に含まれる硫酸バンド由来のアルミナが古紙処理工
程中でのアルカリ処理によってアルミン酸塩となって溶
出し、その後のpH低下によって水酸化アルミニウムとな
って析出し、結晶成長の過程で、脱墨薬品として使用さ
れるケイ酸ソーダに主にとして由来するケイ酸イオンを
取り込んでケイ酸アルミニウムスケールを生成する。Similar scales containing aluminum silicate as a main component are also produced in the deinking pulp manufacturing process. In this case, the alumina derived from the sulfuric acid band contained in the waste paper is eluted as an aluminate by the alkali treatment in the waste paper treatment step, and then the pH is lowered to precipitate as aluminum hydroxide, which causes crystal growth. In the process, silicate ions mainly derived from the sodium silicate used as a deinking chemical are incorporated to produce an aluminum silicate scale.
ケイ酸アルミニウムを主成分とするスケールは、それ自
身が配管の閉塞やワイヤー、フィルターの目詰りといっ
た操業上の問題を生じせしめるのみならず、装置表面の
平滑性を損なうことによって微生物に生育の場所を与
え、スライムデポジットを生じさせたり、原料の集塊化
物を生じさせる原因となって抄紙機での断紙や最終製品
での斑点、穴あきの大きな要因となる。また時にはスケ
ール自身の脱落によって操業性、品質と損なうこともあ
る。このため、ケイ酸アルミニウムを主成分とするスケ
ールの除去は操業性、品質の両面で極めて重要であり、
従来、その目的のため、苛性ソーダ等のアルカリ水溶液
を用いることによて対処されてきている。The scale containing aluminum silicate as a main component not only causes operational problems such as clogging of pipes and clogging of wires and filters, but also impairs the smoothness of the surface of the device, which causes the microorganisms to grow. And cause slime deposits and agglomerates of raw materials, which are major factors for paper breaks in paper machines and spots and perforations in final products. Also, sometimes the scale itself falls off, which impairs operability and quality. For this reason, the removal of scale composed mainly of aluminum silicate is extremely important in terms of workability and quality,
Conventionally, for that purpose, it has been dealt with by using an alkaline aqueous solution such as caustic soda.
しかしながら、この方法では水酸化アルミニウムそのも
のに対して有効であっても、ケイ酸アルミニウムに対し
ては溶解効果が低く、このため、ケイ酸アルミニウムを
主成分とするスケールでは除去が不完全となったり、あ
るいは洗浄時間の長大を余儀なくされているのが実情で
あるため、かねてより製紙業界からそのスケールの有効
な洗浄方法が切望されていた。However, even though this method is effective for aluminum hydroxide itself, it has a low dissolution effect for aluminum silicate, so that the removal may be incomplete on a scale containing aluminum silicate as a main component. Or, since it is a fact that the cleaning time is long, the paper manufacturing industry has long sought an effective cleaning method for the scale.
本発明の目的は前期未解決の問題を解決することにあ
る。本発明者は、紙パルプ製造工程に生じるケイ酸アル
ミニウムを主成分とするスケールの洗浄除去に関し、鋭
意検討した結果、アルカリ水溶液にグルコン酸ソーダを
少量併用することにより、アルカリ単独の水溶液の場合
に比べてケイ酸アルミニウムを主成分とするスケールの
溶解除去効果が著しく促進されることを見出し本発明に
到達した。An object of the present invention is to solve the problems that have not been solved yet. The present inventor, as a result of diligent examination regarding cleaning and removal of a scale containing aluminum silicate as a main component occurring in a paper pulp manufacturing process, by using a small amount of sodium gluconate in an alkaline aqueous solution, in the case of an aqueous solution containing only alkali. In comparison, the inventors have found that the effect of dissolving and removing a scale containing aluminum silicate as a main component is remarkably promoted, and have reached the present invention.
本発明の紙パルプ製造工程に生成するケイ酸アルミニウ
ムを主成分とするスケールの洗浄はグルコン酸ソーダを
0.01〜５重量％含有し、pH10以上のアルカリ性水溶液を
該工程のスケール生成箇所へ添加することによって構成
される。The cleaning of the scale containing aluminum silicate as a main component produced in the paper pulp manufacturing process of the present invention is performed using sodium gluconate.
It is constituted by adding an alkaline aqueous solution containing 0.01 to 5% by weight and having a pH of 10 or more to the scale formation site in the step.
種々の検討の結果、アルカリ水溶液中におけるグルコン
酸ソーダの含有量は0.01〜５重量％、好ましくは0.05〜
１重量％含むものが有効であることを見いだした。0.01
重量％より少量では充分な効果が得られず、また５重量
％より多く含有させても添加量の割にはスケール溶解促
進効果の向上が期待されず経済的でない。また、グルコ
ン酸ソーダ添加水溶液によるケイ酸アルミニウムを主成
分とするスケール溶解促進効果は、アルカリを併用して
pH10以上とすることが必須条件である。この際、pHは高
いほどグルコン酸ソーダの添加効果は大となる。用いら
れるアルカリの種類は時に限定されず、苛性ソーダ、炭
酸ソーダ、苛性カリ等が利用される。尚、本発明の目的
が達成される限り、他の任意の成分、例えば界面活性剤
等を併用してもなんら差支えない。以下に実施例をあげ
て本発明をさらに詳しく説明する。As a result of various studies, the content of sodium gluconate in the alkaline aqueous solution is 0.01 to 5% by weight, preferably 0.05 to
It has been found that one containing 1% by weight is effective. 0.01
If the amount is less than 5% by weight, a sufficient effect cannot be obtained, and even if the amount is more than 5% by weight, the effect of promoting scale dissolution is not expected to be improved for the added amount, which is not economical. In addition, the scale dissolution promoting effect of aluminum silicate as a main component by the sodium gluconate added aqueous solution is
It is an essential condition that the pH is 10 or more. At this time, the higher the pH, the greater the effect of adding sodium gluconate. The type of alkali used is not limited at times, and sodium hydroxide, sodium carbonate, potassium hydroxide, etc. are used. As long as the object of the present invention is achieved, any other component such as a surfactant may be used in combination. Hereinafter, the present invention will be described in more detail with reference to examples.
実施例１ 上質紙抄造の某抄紙機のセーブオールビット壁面より採
取したケイ酸アルミニウムを主成分とするスケールを用
い、苛性ソーダ水溶液単独、およびグルコン酸ソーダ含
有苛性ソーダ水溶液のスケール溶解力を比較した。Example 1 The scale dissolving power of a caustic soda aqueous solution alone and a sodium gluconate-containing caustic soda aqueous solution were compared by using a scale containing aluminum silicate as a main component collected from the wall surface of a save all bit machine of a paper machine for fine papermaking.
（供試スケール組成） 灰分（900℃）:65重量％ 灰分組成:Al2O2 64.1重量％ SiO2 30.8重量％ CaO 2.0重量％ MgO 2.5重量％ Fe2O3 0.6重量％ その他 0.8重量％ （試験方法） 試験液100mlをそれぞれ300ml三角フラスコに取り、20〜
50メッシュの粒度にそろえた上記スケールの200mgを試
験液中に加えた。バイオシェーカー（大洋科学工業
（株）製BR−300L）を用い、100rpm振盪攪拌下で試験液
とスケールを接触させた。所定時間接触後の未溶解スケ
ール重量を求め下式によるスケール溶解率を求めた。
尚、試験液温度は30℃で一定とした。(Sample scale composition) Ash content (900 ° C): 65 wt% Ash composition: Al 2 O 2 64.1 wt% SiO 2 30.8 wt% CaO 2.0 wt% MgO 2.5 wt% Fe 2 O 3 0.6 wt% Other 0.8 wt% ( Test method) Transfer 100ml of test solution to a 300ml Erlenmeyer flask, and
200 mg of the above scale, which had a particle size of 50 mesh, was added to the test solution. Using a bio shaker (BR-300L manufactured by Taiyo Kagaku Kogyo Co., Ltd.), the test solution was brought into contact with the scale under 100 rpm shaking and stirring. The undissolved scale weight after contacting for a predetermined time was calculated, and the scale dissolution rate was calculated by the following formula.
The test solution temperature was constant at 30 ° C.
（結果） 結果を表−１に示す。この結果によれば、グルコン酸ソ
ーダを少量含有させることにより、著しくスケール溶解
が促進されることが示されている。 (Results) The results are shown in Table-1. These results show that the inclusion of a small amount of sodium gluconate significantly promotes scale dissolution.
実施例２ 実施例１同一スケールを用い、種々のpHにおけるグルコ
ン酸ソーダの添加効果を調べた。試験方法は実施例１を
同様に行った。 Example 2 Example 1 Using the same scale, the effect of adding sodium gluconate at various pHs was investigated. The test method was the same as in Example 1.
尚、試験液をスケールの接触時間は２時間（一定）とし
た。表−２に示した結果によりスケール溶解に於けるグ
ルコン酸ソーダの添加効果はpH10以上で発揮されること
が明らかである。The contact time of the test solution with the scale was 2 hours (constant). From the results shown in Table-2, it is clear that the effect of adding sodium gluconate in the scale dissolution is exhibited at pH 10 or higher.
実施例３ 白板紙抄造の某円綱抄紙機のシリンダーモールドおよび
ワイヤーにケイ酸アルミニウムを主成分とするスケール
が付着するため、従来苛性ソーダの１％水溶液を円網バ
ットに張り、２時間シリンダーを回転する方法により洗
浄していたが、スケールは僅かかしか除去出来ずこのた
め濾水性が回復せず操業上の問題を生じていた。 Example 3 Since a scale containing aluminum silicate as a main component adheres to a cylinder mold and a wire of a certain circular rope paper making machine for white paperboard making, a 1% aqueous solution of caustic soda is conventionally placed on a cylinder vat and the cylinder is rotated for 2 hours. Although it was washed by the method described above, only a small amount of scale could be removed, and the drainage was not recovered, which caused an operational problem.
付着スケールの組成は下記の如くであった。The composition of the deposited scale was as follows.
灰 分:59.2重量％ 灰分組成:Al2O2 66.6重量％ SiO2 25.8重量％ CaO 2.5重量％ MgO 0.3重量％ Fe2O3 3.0重量％ CuO 1.8重量％ 図−１に実機に於けるグルコン酸ソーダの添加効果を示
した。この試験では最初の１時間は苛性ソーダ１重量％
水溶液のみを用いる従来法による洗浄を実施し、その後
グルコン酸ソーダを0.2重量％投入してさらに１時間の
洗浄を実施した。スケール溶解量は洗浄液中に溶出した
Alイオン濃度を原子吸光光度法によって測定し、上記ス
ケール組成をもとにスケール量に換算して求めた。Ash: 59.2 wt% Ash composition: Al 2 O 2 66.6 wt% SiO 2 25.8 wt% CaO 2.5 wt% MgO 0.3 wt% Fe 2 O 3 3.0 wt% CuO 1.8 wt% Gluconic acid in actual equipment The effect of adding soda was shown. 1% by weight of caustic soda for the first hour in this test
Washing was carried out by a conventional method using only an aqueous solution, and then 0.2% by weight of sodium gluconate was added to carry out washing for another hour. The amount of scale dissolution was eluted in the washing solution
The Al ion concentration was measured by an atomic absorption spectrophotometric method and converted into a scale amount based on the above scale composition.
図−１よりグルコン酸ソーダの添加によりケイ酸アルミ
ニウムを主成分とするスケールの溶解が著しく促進され
たことが明らかであり、完全に除去されたことが洗浄後
の目視観察によっても確認された。It is clear from FIG. 1 that the addition of sodium gluconate significantly promoted the dissolution of the scale containing aluminum silicate as a main component, and it was also confirmed by visual observation after washing that the scale was completely removed.
本発明の洗浄方法によれば、従来アルカリ液単独では除
去が困難、もしくは除去に長時間を要していた紙パルプ
製造工程のケイ酸アルミニウムを主成分とするスケール
の除去が極めて容易に達成される。これは、操業性なら
びに製品品質の改善に大きく寄与するとともに、洗浄の
ための停止時間の短縮が達成され効率的なプラントの運
転を可能にすることができる。According to the cleaning method of the present invention, it is extremely easy to remove the scale containing aluminum silicate as a main component in the paper pulp manufacturing process, which has conventionally been difficult to remove with an alkali solution alone or required a long time for removal. It This greatly contributes to improvement of operability as well as product quality, and reduction of downtime for cleaning can be achieved to enable efficient plant operation.
図−１は、苛性ソーダ水溶液単独の場合と、グルコン酸
ソーダ含有苛性ソーダ水溶液の場合の各々における洗浄
時間と、洗浄液中の溶解スケール濃度をの関係を図示し
たグラフである。FIG. 1 is a graph illustrating the relationship between the cleaning time and the dissolved scale concentration in the cleaning solution in the case of the aqueous solution of caustic soda alone and the case of the aqueous solution of sodium gluconate-containing caustic soda.
Claims (1)
し、かつpH10以上のアルカリ性水溶液である。洗浄液を
用いることを特徴とする紙パルプ製造工程におけるケイ
酸アルミニウムを主成分とするスケールの洗浄方法。1. An alkaline aqueous solution containing 0.01 to 5% by weight of sodium gluconate and having a pH of 10 or more. A method for cleaning a scale containing aluminum silicate as a main component in a paper pulp manufacturing process, which comprises using a cleaning liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32259889A JPH0723600B2 (en) | 1989-12-14 | 1989-12-14 | Cleaning method for scales containing aluminum silicate as a main component in paper pulp manufacturing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32259889A JPH0723600B2 (en) | 1989-12-14 | 1989-12-14 | Cleaning method for scales containing aluminum silicate as a main component in paper pulp manufacturing process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03185198A JPH03185198A (en) | 1991-08-13 |
| JPH0723600B2 true JPH0723600B2 (en) | 1995-03-15 |
Family
ID=18145494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32259889A Expired - Lifetime JPH0723600B2 (en) | 1989-12-14 | 1989-12-14 | Cleaning method for scales containing aluminum silicate as a main component in paper pulp manufacturing process |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0723600B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103556165A (en) * | 2013-10-25 | 2014-02-05 | 天津沃川水处理工程技术有限公司 | Heavy-duty detergent for inner wall of stainless steel sugar bowl, and preparation method thereof |
| JP6233940B1 (en) * | 2017-01-20 | 2017-11-22 | 株式会社日本キャンパック | CIP cleaning method |
| CN108149017B (en) * | 2017-12-29 | 2019-05-24 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | A system for replacing alkaline etching liquid with mold-boiler liquid and recycling aluminum hydroxide |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54134046A (en) * | 1978-04-10 | 1979-10-18 | Kurita Water Ind Ltd | Removal of scale |
-
1989
- 1989-12-14 JP JP32259889A patent/JPH0723600B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03185198A (en) | 1991-08-13 |
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