JP2012135703A - Method for recovering high purity gypsum powder from gypsum board wasted material at high yield - Google Patents
Method for recovering high purity gypsum powder from gypsum board wasted material at high yield Download PDFInfo
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本発明は、荒破砕処理でボード原紙を除去した石膏粉体中から、残存した紙繊維を除去し、高純度な石膏粉体を高収率で回収する方法を提供するものである。 The present invention provides a method for removing residual paper fibers from gypsum powder from which board base paper has been removed by rough crushing, and recovering high-purity gypsum powder in a high yield.
石膏ボード廃材の発生量は、年間約１５０万ｔであり、この内、約５０万ｔは生産時や家屋等の新築内装工事の端材で、石膏ボードメーカーがリサイクルを行っている。また、残りの約１００万ｔが、家屋等の建造物の改装・解体工事で排出され、埋立処分されている。このような石膏ボード廃材の発生量は年々増加する傾向にあり、埋立地の不足、環境問題の点から石膏ボード廃材の有効な処理方法が求められている。 The amount of gypsum board waste generated is about 1.5 million tons per year. Of this, about 500,000 tons are scraps from new interior construction work at the time of production and houses, and the gypsum board manufacturer recycles them. The remaining 1 million tons are discharged by land renovation and demolition work for buildings such as houses. The amount of such gypsum board waste generated tends to increase year by year, and an effective treatment method for gypsum board waste is required from the viewpoint of lack of landfill and environmental problems.
石膏ボード廃材を有効にリサイクルするためには、石膏とボード原紙を分離する必要がある。これについては、これまでに多くの方法が提案されている（例えば、特許文献１、２参照）。 In order to effectively recycle gypsum board waste, it is necessary to separate gypsum and board base paper. Many methods have been proposed so far (see, for example, Patent Documents 1 and 2).
これらの方法では、通常、石膏ボード廃材をまず荒破砕（粗粉砕）する。石膏ボードを荒破砕する際、ボード原紙の大部分は比較的大きな紙の状態を保持し、一方で石膏は粉体となるため、これらは容易にふるい分離することができる。 In these methods, usually, the gypsum board waste is first roughly crushed (coarse pulverized). When roughly crushing gypsum board, most of the board base paper retains a relatively large paper state, while gypsum becomes powder, so they can be easily separated by sieving.
しかしながら、この際、ボード原紙の一部は叩解され、図１および２に示すような繊維状態となる。この紙繊維は、太さが約１０〜５０μｍと細いが、長さは１ｍｍ以上あるものが多く（以下、このような繊維を単に「紙繊維」と称する場合がある）、目開き１〜３ｍｍ程度のふるいを使用することで、ある程度石膏と分離することができるが、多くの紙繊維がふるいを通過することは避けられなかった。 However, at this time, a part of the board base paper is beaten to form a fiber state as shown in FIGS. This paper fiber is as thin as about 10 to 50 μm in thickness, but is often 1 mm or more in length (hereinafter, such a fiber may be simply referred to as “paper fiber”) and has an opening of 1 to 3 mm. By using a sieve of a degree, it can be separated from gypsum to some extent, but it is inevitable that many paper fibers pass through the sieve.
前記方法でボード原紙と分離された石膏粉体は、半水石膏とし、これと水を混合してスラリー状とした後に成形体を製造することが多い。その際、前記紙繊維が混入していると再凝集して水を吸収するため、スラリーの流動性を悪化させる原因となる。また、成形体の概観不良の原因にもなる。 The gypsum powder separated from the board base paper by the above method is semi-water gypsum, and this and water are mixed to form a slurry, and a molded body is often produced. At that time, if the paper fiber is mixed, it re-aggregates and absorbs water, which causes the fluidity of the slurry to deteriorate. Moreover, it also causes a poor appearance of the molded body.
これを防ぐために、より小さいふるい目で処理した場合、分離できる紙繊維の量は増えるが、同時にふるい上に残留する石膏量が多くなるため、紙繊維を選択的に分離するには至らなかった。このふるい上の石膏粉体は、当然紙繊維の多い石膏粉体である。このため使用用途が限定されるため、大部分は最終処分場で埋め立て処理する必要があり、資源の再利用の観点から問題があった。 In order to prevent this, when processing with a smaller sieve, the amount of paper fiber that can be separated increases, but at the same time, the amount of gypsum remaining on the sieve increases, so paper fibers could not be selectively separated. . The gypsum powder on the sieve is naturally gypsum powder with a lot of paper fibers. For this reason, since the usage is limited, most of the landfill needs to be landfilled at the final disposal site, which is problematic from the viewpoint of resource reuse.
従って、本発明の目的は、従来技術では分離が困難であった、石膏ボード廃材中に残存した紙繊維を、効率よく分離する処理方法を提供することにある。 Accordingly, an object of the present invention is to provide a processing method for efficiently separating paper fibers remaining in gypsum board waste, which has been difficult to separate with the prior art.
本発明者等は、前記目的を達成するために鋭意研究を重ねた。その結果、石膏ボード廃材を荒破砕処理し、ボード原紙を除去した後の紙繊維が残存した石膏粉体を、乾式で衝撃式粉砕機またはジェット式粉砕機で処理することによって、石膏が優先的に衝撃破壊される一方で、紙繊維の多くはそれ以上破壊されず、もとの繊維長を保持することを発見した（図３）。これによって、従来技術では分離ができなかった紙繊維も、ふるい分離できることを見出し、本発明を完成するに至った。 The inventors of the present invention have made extensive studies to achieve the above object. As a result, gypsum is preferentially treated by roughly crushing gypsum board waste and treating the gypsum powder with paper fibers remaining after removing board base paper with a dry-type impact crusher or jet crusher. It was found that many of the paper fibers were not destroyed any more, while retaining the original fiber length (Fig. 3). As a result, it was found that paper fibers that could not be separated by the prior art can also be separated by sieving, and the present invention has been completed.
即ち本発明は、石膏ボード廃材を荒破砕処理し、ボード原紙を除去した後に得られる紙質を含有する石膏粉体から、該紙質を除去して高純度の石膏粉体を回収する方法であって、該紙質を含有する石膏粉体を、乾式で、衝撃式粉砕機またはジェット式粉砕機で微粉砕した後、該微粉砕後の粉体をふるい処理にかけることを特徴とする、前記回収方法である。 That is, the present invention is a method for recovering high-purity gypsum powder by removing the paper quality from the gypsum powder containing paper quality obtained after rough crushing of gypsum board waste and removing the board base paper. The recovery method, wherein the gypsum powder containing the paper is dry-type, finely pulverized by an impact-type pulverizer or a jet-type pulverizer, and the finely pulverized powder is subjected to a sieving treatment. It is.
更に、前記の粉砕機に風力分級機能を付加し、粉砕後の粒度分布の最大粒径を小さくすることで、石膏と紙繊維との分離精度を向上させることができることを見出した。 Furthermore, it has been found that the accuracy of separation between gypsum and paper fibers can be improved by adding an air classification function to the above-mentioned pulverizer and reducing the maximum particle size of the particle size distribution after pulverization.
また、前記紙繊維の残存した石膏粉体を微粉砕する前に、加熱乾燥し、付着水分を完全に除去することによって、より効率的に紙繊維を分離除去することが可能であることをも見出した。 In addition, the paper fiber can be more efficiently separated and removed by heating and drying to completely remove the adhering water before finely pulverizing the remaining gypsum powder of the paper fiber. I found it.
本発明の方法によれば、石膏ボード廃材を荒破砕処理し、ボード原紙を除去した後の紙繊維の残存した石膏ボード廃材から、より純度の高い石膏粉体を回収することができる。従って、本発明で回収した石膏粉体は、半水石膏にした後、水と混合して成形体を作成する場合、紙繊維が残留した場合と比較してスラリーの流動性が良好であるため、より強度の高い成形体を作成することができる。 According to the method of the present invention, it is possible to recover gypsum powder having higher purity from the gypsum board waste material in which the paper fibers remain after the gypsum board waste material is roughly crushed and the board base paper is removed. Therefore, when the gypsum powder recovered in the present invention is made into half-water gypsum and then mixed with water to form a molded body, the fluidity of the slurry is better than when the paper fibers remain. Thus, a molded body having higher strength can be produced.
本発明において、処理の対象となる石膏ボード廃材の由来は特に制限されない。一般には、石膏ボードの生産工程、建築現場の施行工程で発生する端材、残材としての石膏ボードや、改装・解体工事で建築廃材として発生する石膏ボードなどが挙げられる。 In the present invention, the origin of the gypsum board waste material to be treated is not particularly limited. In general, there are gypsum board generated as a waste material in the production process of a gypsum board, a construction site enforcement process, a gypsum board as a residual material, and a gypsum board generated as a construction waste material in renovation and demolition work.
本発明においては、このような石膏ボード廃材を荒破砕処理し、ボード原紙が除去されたものから、さらに紙質を除去して高純度の石膏を回収する。当該粉砕及び除去方法としては、公知の方法が特に制限されることなく適用できる。なおここで、荒破砕とは、石膏ボード廃材中の石膏が、目開き２０ｍｍ程度のふるい下に分離できる大きさになるまでの粉砕をいう。荒粉砕及び後述する微粉砕の効率を考慮すると、ふるい分け法による平均粒径Ｄ５０が１〜１０ｍｍの範囲にあることが好ましく、３〜８ｍｍの範囲にあることがより好ましい。 In the present invention, such a gypsum board waste material is roughly crushed, and the paper quality is further removed from the board base paper removed to collect high-purity gypsum. As the pulverization and removal method, known methods can be applied without particular limitation. Here, rough crushing refers to crushing until the gypsum in the gypsum board waste material has a size that can be separated under a sieve having an opening of about 20 mm. Considering the efficiency of rough pulverization and fine pulverization described later, the average particle diameter D50 by the sieving method is preferably in the range of 1 to 10 mm, and more preferably in the range of 3 to 8 mm.
荒粉砕の方法を具体的に例示すると、２軸スクリューに巻きこむ方法や、ローラー圧縮による方法等が挙げられる。 Specific examples of the rough pulverization method include a method of winding on a twin screw, a method by roller compression, and the like.
また荒粉砕物からのボード原紙の除去方法としては、ふるい分けや風力分離等が挙げられる。 Examples of the method for removing board base paper from the coarsely pulverized product include sieving and wind separation.
後述する微粉砕の際の前記紙繊維の除去効率を考慮すると、紙質成分の残存量が、全体量に対して４質量％以下となるように、より好ましくは２質量％以下となるように、当該ボード原紙が除去されたものが好ましい。一方、通常は、前述したとおり、石膏を高回収率で回収しつつ紙質成分を１質量％以下とすることは極めて困難であり、また、この段階で回収される石膏中の紙質成分が０．５質量％を下回る値であれば、後述する微粉砕を行う利点は大幅に減少する。 Considering the removal efficiency of the paper fiber at the time of pulverization described later, the residual amount of the paper quality component is 4% by mass or less, more preferably 2% by mass or less with respect to the total amount, What removed the board base paper is preferable. On the other hand, as described above, it is extremely difficult to reduce the paper component to 1% by mass or less while collecting the gypsum at a high recovery rate, and the paper component in the gypsum recovered at this stage is 0. If the value is less than 5% by mass, the advantage of performing the fine pulverization described later is greatly reduced.
なお通常は、上述の荒粉砕及びボード原紙の除去を行った後の粉体でも、前記紙繊維に加え、より大きなボード原紙を含有している。本発明における紙質とは、前述した紙繊維のみならず、当該ボード原紙をも含む概念であり、以下に述べる微粉砕及びふるい処理により、双方を除去可能である。 Normally, the powder after the above rough pulverization and board base paper removal also contains larger board base paper in addition to the paper fibers. The paper quality in the present invention is a concept including not only the above-described paper fibers but also the board base paper, and both can be removed by the fine grinding and sieving treatment described below.
本発明においては、上述のようにして荒破砕し、ボード原紙が除去された粉砕物、即ち、紙質を含有する石膏粉体を、乾式で、衝撃式粉砕機またはジェット式粉砕機に投入し、石膏ボード廃材を微粉砕する。なお上記「乾式」とは粉砕に際して用いられる分散媒が気体であることをいう。 In the present invention, the crushed material from which the board base paper has been removed by rough crushing as described above, that is, gypsum powder containing paper quality, is put into a dry type, impact type pulverizer or jet type pulverizer, Grind gypsum board waste. The “dry type” means that the dispersion medium used for pulverization is a gas.
衝撃式粉砕機またはジェット式粉砕機の例としては、例えば、「粉体工学便覧 第２版」（日刊工業新聞社、１９９８年発行）の第３０２頁に記載の表４．２．６に具体的に記載されている。 Examples of impact pulverizers or jet pulverizers include, for example, Table 4.2.6 described on page 302 of “Powder Engineering Handbook 2nd Edition” (published by Nikkan Kogyo Shimbun, 1998). Has been described.
より具体的には衝撃式粉砕機としては、高速で回転するハンマ、ピン、羽根で被粉砕物を叩くタイプのミルが挙げられる。ジョット式粉砕機では、ノズルから高圧で噴出する空気または蒸気に被粉砕物を巻き込み、被粉砕物どうし、または衝撃板に衝突させるタイプのミルが挙げられる。 More specifically, examples of the impact pulverizer include a mill of a type in which an object to be crushed is hit with a hammer, a pin, and a blade rotating at high speed. The Giotto pulverizer includes a mill of a type in which an object to be pulverized is entrained in air or steam ejected from a nozzle at a high pressure and collides with the objects to be pulverized or impact plates.
石膏の結晶と紙繊維では、衝撃破壊強度が大きく異なるため、上記の如き衝撃式粉砕機またはジェット式粉砕機によって、石膏が微粉砕されるような場合でも、紙繊維は処理前の繊維長をほとんど保持する。このため、多くの紙繊維は、次に述べるふるい処理を行うことによって、石膏粉体中から分離除去することが可能となる。またボード原紙は、通常は紙繊維程度までは細かくされるが、その後は、上述の理由により、ふるいによる除去が可能な大きさを保つ。 Since the impact fracture strength differs greatly between gypsum crystals and paper fiber, even if gypsum is finely pulverized by the above-mentioned impact pulverizer or jet pulverizer, the paper fiber has a fiber length before treatment. Hold almost. For this reason, many paper fibers can be separated and removed from the gypsum powder by performing the following sieve treatment. Also, the board base paper is usually made fine to the extent of paper fibers, but after that, for the reasons described above, the size that can be removed by sieving is maintained.
また前記表に記載の微粉砕機のなかでも広義のボールミル、撹拌ミルおよびせん断ミルに分類されるタイプは、石膏粉砕中に紙繊維も粉砕し、最終的には粉体状にまでするため、やはり本発明で用いる微粉砕機とすることはできない。 Among the fine pulverizers listed in the above table, the types classified into broad ball mills, agitation mills and shear mills also pulverize paper fibers during gypsum pulverization, and finally to a powder form. After all, it cannot be a fine pulverizer used in the present invention.
本発明において、上記微粉砕における微粉砕処理後の石膏の粒径は、紙繊維と効率よくふるい分けにより分離できる大きさであれば良く、特に制限されないが、平均粒径０．５〜２０μｍ、更に好ましくは１〜１０μｍである。なお、該平均粒径とは、レーザー回折散乱式粒度分布計で、分散媒体にエタノールを用いて測定した際の体積平均粒径の測定結果であり、後述の平均粒径もこの測定結果の数値を示す。 In the present invention, the particle size of the gypsum after the fine pulverization process in the fine pulverization is not particularly limited as long as it is a size that can be separated from the paper fiber by efficient sieving, but the average particle size is 0.5 to 20 μm, Preferably it is 1-10 micrometers. The average particle diameter is a measurement result of a volume average particle diameter measured with a laser diffraction / scattering particle size distribution meter using ethanol as a dispersion medium. The average particle diameter described later is also a numerical value of the measurement result. Indicates.
さらに本発明において用いる衝撃式粉砕機またはジェット式粉砕機としては、風力分級機能を有するものが、石膏と紙繊維の分離精度を更に向上させることができ好ましい。即ち、風力分級機能を有する微粉砕機は、粉砕された石膏（粒子）を風力分級し、所定の粒径に達していない粒子を粉砕機に戻し再粉砕するとともに、所定の粒径に達している粒子については回収し再度粉砕機にかけないようにして、その粉砕効率を向上させている。この際、比重の軽い紙繊維は、その繊維長が長くても、風力分級に際しては微少な石膏粉と同様の挙動を示すため、これによって、回収された粉体中の紙繊維と石膏微粒子の大きさの差をより大きくすることができる。 Further, as the impact type pulverizer or jet type pulverizer used in the present invention, one having an air classification function is preferable because it can further improve the separation accuracy of gypsum and paper fibers. That is, the fine pulverizer having an air classification function wind-classifies the pulverized gypsum (particles), returns the particles that have not reached the predetermined particle size to the pulverizer, and re-pulverizes them, and reaches the predetermined particle size. The collected particles are not collected and applied again to the pulverizer to improve the pulverization efficiency. At this time, the paper fiber having a low specific gravity exhibits the same behavior as the fine gypsum powder even when the fiber length is long, and thus the paper fiber and the gypsum fine particles in the recovered powder are The difference in size can be further increased.
本発明においては、このようにして微粉砕処理を行った石膏粉体をふるい処理する。これによって、微粉化された石膏粉末と、紙質（通常は、元の石膏粉末に大きめのボード原紙が混入していても、前記微粉砕により紙繊維まで粉砕されているため、以下では「紙繊維」と称す）とが分離できる。この際のふるいの目開きは、紙繊維と石膏を効率よく分離できる大きさであれば良く、特に制限されないが、５０〜５００μｍ、更に好ましくは１００〜３００μｍである。 In the present invention, the gypsum powder thus finely pulverized is sieved. As a result, the pulverized gypsum powder and the paper quality (normally, even if a large board base paper is mixed in the original gypsum powder, the paper fiber is pulverized by the fine pulverization. Can be separated from each other. The opening of the sieve at this time is not particularly limited as long as it is a size capable of efficiently separating paper fibers and gypsum, but is 50 to 500 μm, more preferably 100 to 300 μm.
更に、紙繊維が残留した石膏粉体を、前もって加熱乾燥することによって、より効率よく紙繊維をふるい分離することができる。即ち、石膏ボード廃材には、濡れているものが含まれている場合が多い。この状態の石膏ボード廃材を微粉砕処理した場合、粉砕機内でのスケーリングの原因となる。また、微粉砕後の石膏が凝集しやすくなるため、ふるいが困難となる場合がある。よって、石膏ボード廃材を粉砕処理の前に加熱乾燥することによって、よりスムーズに粉砕、ふるい処理が可能となる。この加熱乾燥条件は、付着水分の量に依存するため一概に決めることができず、各々のケースにおいて、付着水分が除去される温度、時間であれば良い。前述のように、石膏を半水石膏にして、これと水を混合して成形体を得ようとする場合は、１１０〜１５０℃で加熱乾燥することによって、付着水分の除去と同時に、この工程で全量半水化することが効率的で好ましい。 Furthermore, the paper fibers can be more efficiently sieved and separated by heating and drying the gypsum powder in which the paper fibers remain. That is, the gypsum board waste material often contains wet material. When the gypsum board waste material in this state is finely pulverized, it causes scaling in the pulverizer. Moreover, since gypsum after fine pulverization tends to aggregate, sieving may be difficult. Therefore, grinding and sieving can be performed more smoothly by heating and drying the gypsum board waste material before the grinding treatment. Since the heating and drying conditions depend on the amount of adhering moisture, it cannot be determined unconditionally. In each case, the temperature and time may be any temperature at which the adhering moisture is removed. As described above, when gypsum is made into semi-water gypsum and mixed with water to obtain a molded body, this process is performed simultaneously with removal of adhering moisture by heating and drying at 110 to 150 ° C. It is efficient and preferable to make the whole amount half water.
以下、本発明を更に具体的に説明するため、実施例を示すが、本発明は、これらの実施例に限定されるものではない。 EXAMPLES Hereinafter, examples will be shown to describe the present invention more specifically, but the present invention is not limited to these examples.
なお、以下の実施例及び比較例において、紙繊維の残存量は、以下の方法により求めた。 In the following examples and comparative examples, the remaining amount of paper fiber was determined by the following method.
所定量の石膏ボード廃材を秤量し、この廃材中の石膏と、反応するのに十分な量の水酸化ナトリウム水溶液と、石膏ボード廃材を混合撹拌し、石膏をすべて水酸化カルシウムにした。その後、これをろ過し、水酸化カルシウムのケーキを水洗した。次に、この水酸化ナトリウムをこれと反応するのに十分な量の塩酸水溶液と混合撹拌し、水酸化カルシウムをすべて溶解させた。次に、これをろ過、水洗した後、残留固形分を１００℃で乾燥し、水分を除去した。乾燥後の固形分を１０００℃まで加熱し、この際の重量減少分を紙繊維の重量とした。 A predetermined amount of gypsum board waste material was weighed, and the gypsum in this waste material, a sufficient amount of sodium hydroxide aqueous solution to react, and the gypsum board waste material were mixed and stirred to make all the gypsum into calcium hydroxide. Then, this was filtered and the calcium hydroxide cake was washed with water. Next, this sodium hydroxide was mixed and stirred with a sufficient amount of aqueous hydrochloric acid solution to react with it to dissolve all the calcium hydroxide. Next, after filtering and washing with water, the residual solid was dried at 100 ° C. to remove moisture. The solid content after drying was heated to 1000 ° C., and the weight loss at this time was defined as the weight of the paper fiber.
実施例１
石膏ボード廃材を荒破砕処理し、ボード原紙を目開き１４ｍｍでふるい除去した紙繊維の残存量１．３％の石膏粉体を旋回流型ジェットミルに投入し、平均粒径８μｍまで粉砕した。粉砕処理後の石膏粉体を、目開き２５０μｍでふるい処理を行った。ふるいを通過して得られた処理後の石膏粉体中の紙繊維の残留量は０．５％であり、その際の石膏粉体の回収率は９９％以上であった。
Example 1
The gypsum board waste material was roughly crushed, and gypsum powder with a residual amount of 1.3% of the paper fiber obtained by sieving and removing the board base paper with an opening of 14 mm was put into a swirling jet mill and pulverized to an average particle size of 8 μm. The pulverized gypsum powder was sieved with an opening of 250 μm. The residual amount of paper fibers in the treated gypsum powder obtained through the sieve was 0.5%, and the recovery rate of the gypsum powder at that time was 99% or more.
実施例２
石膏ボード廃材を荒破砕処理し、ボード原紙を目開き１４ｍｍでふるい除去した紙繊維の残存量１．３％の石膏粉体を、風力分級機能付きのハンマミルに投入し、平均粒径６μｍまで粉砕した。粉砕処理後の石膏ボード廃材を目開き２００μｍでふるい処理を行った。ふるいを通過して得られた処理後の石膏粉体中の紙繊維の残留量は０．４％であり、その際の石膏粉体の回収率は９９％以上であった。
Example 2
Gypsum powder with 1.3% residual paper fiber, which is obtained by roughly crushing gypsum board waste and removing the board base paper with a 14 mm sieve, is put into a hammer mill with an air classification function and pulverized to an average particle size of 6 μm. did. The crushed gypsum board waste material was sieved with an opening of 200 μm. The residual amount of paper fibers in the treated gypsum powder obtained through the sieve was 0.4%, and the recovery rate of the gypsum powder at that time was 99% or more.
実施例３
石膏ボード廃材を荒破砕処理し、ボード原紙を目開き１１ｍｍでふるい除去した紙繊維の残留量０．８％の石膏ボード廃材を、１３０℃で加熱乾燥した後、風力分級機能付きのハンマミルに投入し、平均粒径５μｍまで粉砕した。粉砕処理後の石膏ボード廃材を目開き１００μｍでふるい処理を行った。ふるいを通過して得られた処理後の石膏粉体中の紙繊維の残留量は０．３％であり、その際の石膏粉体の回収率は９９％以上であった。
Example 3
Gypsum board waste material is roughly crushed, and the board base paper is sieved and removed with an opening of 11 mm. The remaining amount of paper gypsum board waste is 0.8%, and is heated and dried at 130 ° C before being put into a hammer mill with an air classification function. And pulverized to an average particle size of 5 μm. The crushed gypsum board waste material was sieved with an opening of 100 μm. The residual amount of paper fiber in the treated gypsum powder obtained through the sieve was 0.3%, and the recovery rate of the gypsum powder at that time was 99% or more.
比較例１
石膏ボード廃材を荒破砕処理し、ボード原紙を目開き１１ｍｍでふるい除去した紙繊維の残存量０．８％の石膏ボード廃材を目開き２５０μｍでふるい処理を行った。ふるいを通過して得られた処理後の石膏粉体中の紙繊維の残留量は０．５％であり、その際の石膏粉体の回収率は２５％であった。
Comparative Example 1
The waste gypsum board was roughly crushed, and the waste gypsum board with a residual amount of 0.8% of the paper fiber obtained by sieving and removing the base board paper with an opening of 11 mm was sieved with an opening of 250 μm. The residual amount of paper fiber in the treated gypsum powder obtained through the sieve was 0.5%, and the recovery rate of the gypsum powder at that time was 25%.
比較例２
石膏ボード廃材を荒破砕処理し、ボード原紙を目開き１４ｍｍでふるい除去した紙繊維の残存量１．３％の石膏ボード廃材をポットミルに投入し、平均粒径８μｍまで粉砕した。粉砕処理後の石膏ボード廃材を、目開き２５０μｍでふるい処理を行った。ふるいを通過して得られた処理後の石膏粉体中の紙繊維の残留量は１．２％であった。
Comparative Example 2
The waste gypsum board was roughly crushed, and the waste gypsum board with 1.3% residual paper fiber obtained by sieving and removing the board base paper with an opening of 14 mm was put into a pot mill and pulverized to an average particle size of 8 μm. The waste gypsum board material after pulverization was sieved with an opening of 250 μm. The residual amount of paper fibers in the treated gypsum powder obtained through the sieve was 1.2%.
比較例３
石膏ボード廃材を荒破砕処理し、ボード原紙を目開き１１ｍｍでふるい除去した紙繊維の残存量０．８％の石膏ボード廃材を遊星ミルに投入し、平均粒径５μｍまで粉砕した。粉砕処理後の石膏ボード廃材を、目開き２００μｍでふるい処理を行った。ふるいを通過して得られた処理後の石膏ボード廃材中の紙繊維の残留量は０．８％であった。
Comparative Example 3
The waste gypsum board was roughly crushed, and the waste gypsum board with the remaining amount of 0.8% of the paper fiber obtained by sieving and removing the board base paper with an opening of 11 mm was put into a planetary mill and pulverized to an average particle size of 5 μm. The waste gypsum board material after pulverization was sieved with an opening of 200 μm. The residual amount of paper fiber in the treated gypsum board waste material obtained through the sieve was 0.8%.
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