JP2022024689A - Method of crushing waste gypsum - Google Patents

Method of crushing waste gypsum Download PDF

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JP2022024689A
JP2022024689A JP2020127415A JP2020127415A JP2022024689A JP 2022024689 A JP2022024689 A JP 2022024689A JP 2020127415 A JP2020127415 A JP 2020127415A JP 2020127415 A JP2020127415 A JP 2020127415A JP 2022024689 A JP2022024689 A JP 2022024689A
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mesh
gypsum
mill
opening
waste gypsum
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直樹 松田
Naoki Matsuda
誠 片岡
Makoto Kataoka
晋吾 平中
Shingo Hiranaka
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Tokuyama Corp
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Tokuyama Corp
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Priority to JP2020127415A priority Critical patent/JP2022024689A/en
Priority to PCT/JP2021/015914 priority patent/WO2022024475A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/02—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/13—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft and combined with sifting devices, e.g. for making powdered fuel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/46—Sulfates

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing Of Solid Wastes (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

To provide a crushing method which effectively separates paper pieces and gypsum and suppresses injury of mill mesh that is used for crushing when crushing waste gypsum.SOLUTION: Waste gypsum is crushed by using two sets of mills. Either mill 2 includes a projection port 18 on one end part and a discharge port 19 on the other end part, and rotates a rotation shaft 10 which is provided with a hammer 12 within a casing 16. The mill on the first step causes opening of the mesh 22 to be (12 to 30) mm and the mill on the second step causes opening of the mesh to be (3 to 12) mm. The waste gypsum is put into the mill on the first step, the waste gypsum which passes through the mesh of the mill on the first step is put into the mill on the second step, paper pieces and foreign matters are provided from discharge ports of the mill on the first step and the mill on the second step, and the waste gypsum powder is obtained from the mesh of the mill on the second step.SELECTED DRAWING: Figure 2

Description

この発明は廃石膏の破砕方法に関する。 The present invention relates to a method for crushing waste gypsum.

発明者は、廃石膏ボードからの石膏の回収を検討している。特許文献１（特開2020-65975）は石膏の回収方法の例を示している。最初に廃石膏ボードを破砕し、次いで適当な粒度に粉砕し、石膏粒体と紙片とを分離する。得られた石膏粒体をか焼し、次いで水と混合して石膏スラリーとする。この石膏スラリーから二水石膏を析出させ、固液分離装置で二水石膏粒子を分離する。廃石膏ボード中には、金具などの金属異物と、モルタル、コンクリートなどの硬質異物が混入している。そこで石膏スラリー中の金属異物及び硬質異物を比重の差により分離する。なお廃石膏ボードから得られるものの内で価値があるのは、二水石膏と紙片である。またこの明細書では、金属異物と硬質異物をまとめて重量異物と呼ぶ。 The inventor is considering recovering gypsum from waste gypsum board. Patent Document 1 (Japanese Patent Laid-Open No. 2020-65975) shows an example of a method for recovering gypsum. First, the waste gypsum board is crushed, then crushed to an appropriate particle size, and the gypsum granules and the piece of paper are separated. The obtained gypsum granules are calcinated and then mixed with water to form a gypsum slurry. Dihydrate gypsum is precipitated from this gypsum slurry, and the dihydrate gypsum particles are separated by a solid-liquid separator. Metallic foreign substances such as metal fittings and hard foreign substances such as mortar and concrete are mixed in the waste gypsum board. Therefore, the metallic foreign matter and the hard foreign matter in the gypsum slurry are separated by the difference in specific gravity. Of the things that can be obtained from waste gypsum board, the two water gypsum and pieces of paper are valuable. Further, in this specification, metallic foreign matter and hard foreign matter are collectively referred to as heavy foreign matter.

特開2020-65975Japanese Patent Laid-Open No. 2020-65975

廃石膏の破砕の過程で紙片と石膏を分離できると好ましい。発明者は、ハンマーを備えた回転軸をケーシング内で回転させる打撃式のミルが、この目的に適していることを確認した。即ち、廃石膏ボードをケーシングの一端付近から投入し、回転するハンマーにより破砕し、破砕された石膏塊をケーシングのメッシュから排出する。紙片は破砕されにくいのでメッシュを通らず、ケーシングの他端付近までハンマーにより送られて排出される。 It is preferable that the piece of paper and the gypsum can be separated in the process of crushing the waste gypsum. The inventor has confirmed that a striking mill that rotates a rotating shaft with a hammer inside the casing is suitable for this purpose. That is, the waste gypsum board is thrown in from the vicinity of one end of the casing, crushed by a rotating hammer, and the crushed gypsum lump is discharged from the mesh of the casing. Since the piece of paper is not easily crushed, it does not pass through the mesh and is sent by a hammer to the vicinity of the other end of the casing and discharged.

廃石膏ボードには、石膏とボード紙の他に、金具などの金属片、モルタル、コンクリート等の重量異物が含まれている。紙片と石膏を分離するためには、メッシュの開口を小さくすることが好ましいが、このようなメッシュは肉薄で機械的強度が制限されるため、重量異物により損傷しやすい。なおメッシュの開口は打ち抜き等により設けるため、メッシュの開口径（直径）はメッシュの肉厚以上になり、開口を小さくすると、メッシュの肉厚も小さくなる。 In addition to gypsum and board paper, waste gypsum board contains metal pieces such as metal fittings and heavy foreign substances such as mortar and concrete. In order to separate the piece of paper and gypsum, it is preferable to make the opening of the mesh small, but such a mesh is thin and has limited mechanical strength, so that it is easily damaged by heavy foreign matter. Since the opening of the mesh is provided by punching or the like, the opening diameter (diameter) of the mesh becomes larger than the wall thickness of the mesh, and when the opening is made smaller, the wall thickness of the mesh also becomes smaller.

この発明の課題は、廃石膏を破砕する際に、紙片と石膏を効果的に分離すること、及び、破砕に用いるミルのメッシュの損傷を抑制することにある。 An object of the present invention is to effectively separate a piece of paper and gypsum when crushing waste gypsum, and to suppress damage to the mesh of the mill used for crushing.

この発明では、１段目と２段目の２台のミルを用いて廃石膏を破砕する。ミルはいずれも、一端部に投入口を他端部に排出口を備え、かつ投入口と排出口の間にメッシュを有するケーシングを備え、ケーシング内でハンマーを備えた回転軸を回転させるミルである。１段目のミルでは前記メッシュの開口を12mm以上30mm以下とし、２段目のミルでは前記メッシュの開口を3mm以上12mm以下とし、かつ２段目のミルのメッシュの開口を１段目のミルのメッシュの開口よりも小さくし、
１段目のミルの投入口から廃石膏を投入し、
１段目のミルのメッシュを通過した廃石膏を２段目のミルの投入口から投入し、
１段目のミルと２段目のミルの排出口から紙片と異物を得、
２段目のミルのメッシュから廃石膏粒体を得る。これらの開口のサイズは、メッシュの損傷を減らしながら、石膏と紙片を分離するために、発明者が経験的に求めた値である。なおメッシュの肉厚は、メッシュの開口径とほぼ同じである。 In the present invention, waste gypsum is crushed using two mills, one for the first stage and the other for the second stage. All mills are mills that have an inlet at one end and an outlet at the other end, a casing with a mesh between the inlet and the outlet, and a rotating shaft with a hammer inside the casing. be. In the first-stage mill, the mesh opening is 12 mm or more and 30 mm or less, in the second-stage mill, the mesh opening is 3 mm or more and 12 mm or less, and the mesh opening of the second-stage mill is the first-stage mill. Smaller than the mesh opening of
Put the waste gypsum from the inlet of the first stage mill,
The waste gypsum that has passed through the mesh of the first stage mill is poured from the inlet of the second stage mill.
Obtain a piece of paper and foreign matter from the outlets of the first and second mills,
Waste gypsum granules are obtained from the mesh of the second stage mill. The size of these openings is a value empirically determined by the inventor to separate the gypsum and the piece of paper while reducing damage to the mesh. The wall thickness of the mesh is almost the same as the opening diameter of the mesh.

好ましくは、１段目のミルのメッシュの開口を14mm以上20mm以下とし、２段目のミルのメッシュの開口を5mm以上10mm以下とする。これらの開口サイズは、石膏と紙片を分離し、かつメッシュの損傷を少なくするための、経験的な最適範囲である。 Preferably, the mesh opening of the first-stage mill is 14 mm or more and 20 mm or less, and the mesh opening of the second-stage mill is 5 mm or more and 10 mm or less. These opening sizes are an empirical optimum range for separating gypsum and pieces of paper and reducing damage to the mesh.

この発明では、ハンマーで廃石膏を破砕し、紙片と石膏粒体とに分離する。投入口から排出口まで移動する間に、廃石膏はハンマーにより繰り返し打撃を受け、紙片から石膏が脱落する。1段目のミルはメッシュの開口が12mm以上30mm以下と大きいので、破砕された石膏塊はメッシュから素早く排出される。またメッシュを肉厚にできるので、重量異物によるメッシュの損傷を抑制できる。紙片及び重量異物は１段目のミルの排出口から排出され、紙片に付着している石膏分は少ない。２段目のミルにも重量異物が混入するが、１段目のミルのメッシュを通過した小さな異物なので、メッシュを損傷させることは少ない。石膏塊は２段目のミルでさらに破砕されて石膏粒体となり、紙片及び重量異物と石膏粒体に分離される。 In the present invention, waste gypsum is crushed with a hammer and separated into a piece of paper and gypsum granules. While moving from the input port to the discharge port, the waste gypsum is repeatedly hit by a hammer, and the gypsum falls off from the piece of paper. Since the mesh opening of the first stage mill is as large as 12 mm or more and 30 mm or less, the crushed gypsum mass is quickly discharged from the mesh. Moreover, since the mesh can be made thicker, damage to the mesh due to heavy foreign matter can be suppressed. The piece of paper and heavy foreign matter are discharged from the discharge port of the first-stage mill, and the amount of gypsum adhering to the piece of paper is small. Heavy foreign matter is also mixed in the second stage mill, but since it is a small foreign matter that has passed through the mesh of the first stage mill, it is unlikely to damage the mesh. The gypsum lump is further crushed by the second-stage mill to become gypsum granules, which are separated into a piece of paper and heavy foreign matter and gypsum granules.

この発明では、回転打撃式のハンマーを備えた２段のミルにより、廃石膏を紙片と石膏に分離する。ここで１段目のミルではメッシュの開口を12mm以上30mm以下、２段目のミルではメッシュの開口を3mm以上12mm以下とすることにより、紙片と石膏を充分に分離でき、かつメッシュの損傷も抑制できる。 In the present invention, waste gypsum is separated into a piece of paper and gypsum by a two-stage mill equipped with a rotary striking hammer. Here, by setting the mesh opening to 12 mm or more and 30 mm or less in the first-stage mill and the mesh opening to 3 mm or more and 12 mm or less in the second-stage mill, paper pieces and plaster can be sufficiently separated and the mesh is damaged. Can be suppressed.

実施例での、廃石膏ボードから二水石膏粒子の回収までの工程図Process diagram from waste gypsum board to recovery of dihydrate gypsum particles in Examples 実施例で用いるミルの鉛直方向断面図Vertical sectional view of the mill used in the examples 実施例でのメッシュの平面図Top view of the mesh in the examples 実施例でのメッシュの断面図Cross-sectional view of the mesh in the examples メッシュの開口の変形例を示す図The figure which shows the deformation example of the opening of a mesh メッシュの開口の第２の変形例を示す図The figure which shows the 2nd modification of the opening of a mesh

以下に本発明を実施するための実施例を示す。この発明の範囲は、特許請求の範囲の記載に基づき、明細書の記載とこの分野での周知技術とを参酌し、当業者の理解に従って定められるべきである。この発明の範囲は実施例により限定されるものではない。 Examples for carrying out the present invention are shown below. The scope of the present invention should be determined in accordance with the understanding of those skilled in the art, based on the description of the scope of claims, taking into consideration the description of the specification and well-known techniques in the art. The scope of the present invention is not limited to the examples.

図１～図６に、実施例の廃石膏ボードの破砕方法を示す。図１は廃石膏ボードから二水石膏の回収までの工程を示し、廃石膏ボードを１段目のミル2に投入し破砕する。なお必要であれば、１段目のミル2の前段で、廃石膏ボードをチェーン式破砕機等で粗く破砕し、ミル2に投入できるサイズにする。１段目のミル2で廃石膏ボードを粗く破砕し、紙片と重量異物の混合物と、石膏塊とに分離する。１段目のミル2のメッシュを通過した石膏塊を２段目のミル3に投入し、石膏塊をさらに破砕することにより、紙片と重量異物を分離する。ミル2,3から得た紙片と重量異物を、サイクロン、振動篩等の比重選別装置4によりさらに分離し、石膏、紙片及び重量異物に分離する。 1 to 6 show a method of crushing the waste gypsum board of the example. FIG. 1 shows the process from the waste gypsum board to the recovery of the dihydrate gypsum, and the waste gypsum board is put into the first stage mill 2 and crushed. If necessary, the waste gypsum board is roughly crushed with a chain type crusher or the like in the front stage of the first stage mill 2 to a size that can be put into the mill 2. The waste gypsum board is roughly crushed by the first-stage mill 2 and separated into a mixture of a piece of paper and a heavy foreign substance and a gypsum block. The gypsum lump that has passed through the mesh of the first-stage mill 2 is put into the second-stage mill 3, and the gypsum lump is further crushed to separate the paper piece and the heavy foreign matter. The paper pieces and heavy foreign substances obtained from the mills 2 and 3 are further separated by a specific gravity sorting device 4 such as a cyclone and a vibrating sieve, and separated into gypsum, paper pieces and heavy foreign substances.

２段目のミル3のメッシュから排出された石膏粒体は、必要であれば粉砕装置5により粉砕し、あるいは比重分離装置、磁選機等により、紙片と重量異物を石膏からさらに分離する。石膏をサイロ6に一端貯蔵し、か焼機7によりか焼することにより、半水及び/又は無水III型石膏とする。次いで、晶析装置8で水性媒体と混合することにより、石膏スラリーとし、二水石膏粒子を析出させる。石膏スラリーをフィルタープレス等の固液分離装置9により固液分離し、二水石膏粒子とろ液とに分離し、ろ液は例えば晶析装置8へ還流させる。この発明は廃石膏を２段直列のミル2,3により破砕することにあり、他の点は適宜に変更できる。 The gypsum granules discharged from the mesh of the second-stage mill 3 are crushed by a crushing device 5 if necessary, or a piece of paper and a heavy foreign substance are further separated from the gypsum by a specific gravity separating device, a magnetic separator or the like. The gypsum is once stored in a silo 6 and baked with a calcination machine 7 to obtain semi-water and / or anhydrous type III gypsum. Then, it is mixed with an aqueous medium in the crystallization apparatus 8 to form a gypsum slurry, and dihydrate gypsum particles are precipitated. The gypsum slurry is solid-liquid separated by a solid-liquid separation device 9 such as a filter press, separated into dihydrate gypsum particles and a filtrate, and the filtrate is returned to, for example, a crystallization apparatus 8. The present invention is to crush waste gypsum with two-stage series mills 2 and 3, and other points can be changed as appropriate.

図２に１段目のミル2の構造を示し、メッシュの開口サイズが小さいこと等の他は、２段目のミル3も同様である。回転軸10にハンマー12が複数列が設けられ、ハンマー12の打撃面は回転軸10の軸方向から傾斜し、廃石膏を図２の右から左へ送る。回転軸10はモータ14により回転し、15,15は回転軸10を支持する軸受である。回転軸10とハンマー12は例えば鋼製のケーシング16内に収容され、ケーシング16の一端側に投入口18があり、図示しない廃石膏ボードを投入する。廃石膏ボードが投入口18を通り難い場合、図示しないチェーン破砕機などにより廃石膏ボードを予め破砕しておく。ケーシング16の他端側に排出口19があり、ハンマー12によりメッシュ22の開口を通過するサイズまで破砕されなかった紙片と重量異物を排出する。 FIG. 2 shows the structure of the first-stage mill 2, and the same applies to the second-stage mill 3 except that the opening size of the mesh is small. A plurality of rows of hammers 12 are provided on the rotating shaft 10, the striking surface of the hammer 12 is inclined from the axial direction of the rotating shaft 10, and waste gypsum is sent from right to left in FIG. The rotary shaft 10 is rotated by the motor 14, and 15 and 15 are bearings that support the rotary shaft 10. The rotating shaft 10 and the hammer 12 are housed in, for example, a steel casing 16, and there is a charging port 18 on one end side of the casing 16 to load waste gypsum board (not shown). If it is difficult for the waste gypsum board to pass through the slot 18, the waste gypsum board is crushed in advance by a chain crusher or the like (not shown). There is a discharge port 19 on the other end side of the casing 16 to discharge pieces of paper and heavy foreign matter that have not been crushed to a size that passes through the opening of the mesh 22 by the hammer 12.

ケーシング16の例えば下方に、多数の開口を備えるメッシュ22が設けられ、ハンマー12により破砕され、開口を通るサイズまで破砕された石膏塊をカバー２０底部の出口２１から排出する。なおメッシュ22は、ケーシング16の下方のみでなく全周に設けても良い。 For example, below the casing 16, a mesh 22 having a large number of openings is provided, and a gypsum block crushed by a hammer 12 and crushed to a size passing through the openings is discharged from an outlet 21 at the bottom of the cover 20. The mesh 22 may be provided not only below the casing 16 but also on the entire circumference.

図３，図４に、メッシュ22の開口25を示す。24は鋼などの金属板で、打ち抜き等により例えば円形の開口２５を設ける。金属板24の厚さｔは、開口25の開口径Ｄ（直径）とほぼ同じで有る。メッシュ22の開口率（メッシュ22を上方から見て、開口25の合計面積を、開口25を含むメッシュ22の面積で割ったもの）は例えば20％以上50％以下とし、好ましくは30％以上40％以下とする。開口率が高いほど破砕の効率が増すが、、メッシュ22の強度が低下する。 3 and 4 show the opening 25 of the mesh 22. Reference numeral 24 denotes a metal plate such as steel, and a circular opening 25 is provided, for example, by punching or the like. The thickness t of the metal plate 24 is substantially the same as the opening diameter D (diameter) of the opening 25. The aperture ratio of the mesh 22 (when the mesh 22 is viewed from above, the total area of the openings 25 divided by the area of the mesh 22 including the openings 25) is, for example, 20% or more and 50% or less, preferably 30% or more and 40. % Or less. The higher the aperture ratio, the higher the crushing efficiency, but the lower the strength of the mesh 22.

１段目のミル2では、開口径Ｄを12mm以上30mm以下、好ましくは14mm以上20mm以下とする。メッシュ22の厚さｔを12mm以上、好ましくは14mm以上とすると、廃石膏ボード中の金属異物、モルタル、コンクリート等の硬質異物により損傷することはほとんどない。また石膏ボードの規格上、廃石膏ボードの厚さは12.5mmまたは9mmのものが多いので、開口径Ｄを12mm以上、好ましくは14mm以上とすると、破砕された石膏塊は開口25を簡単に通過できる。回転打撃式のハンマー12は廃石膏を破砕し、紙片と石膏塊に分離する。廃石膏をケーシング16内で移動させる間に、紙片に付着した石膏は繰り返し打撃を受けて紙片から脱落し、メッシュ22から排出されるので、紙片に付着して排出される石膏分は少ない。経験的には、開口径Ｄを12mm以上とすると、石膏成分の90%以上を開口25から取り出すことができる。開口径Ｄを30mm以下、好ましくは20mm以下とすると、２段目のミル3へ入る紙片と重量異物を減らすことができ、また大きなサイズの重量異物が２段目のミル3に混入し、メッシュを損傷させることを防止できる。なお仮にミル2のメッシュの開口を12mm未満にすると、メッシュが損傷するだけでなく、紙片と共に排出口19から排出される石膏分が増す。 In the first-stage mill 2, the opening diameter D is 12 mm or more and 30 mm or less, preferably 14 mm or more and 20 mm or less. When the thickness t of the mesh 22 is 12 mm or more, preferably 14 mm or more, it is hardly damaged by metal foreign matter, mortar, concrete or other hard foreign matter in the waste gypsum board. Also, due to the standard of gypsum board, the thickness of waste gypsum board is often 12.5 mm or 9 mm, so if the opening diameter D is 12 mm or more, preferably 14 mm or more, the crushed gypsum block easily passes through the opening 25. can. The rotary striking hammer 12 crushes the waste gypsum and separates it into pieces of paper and gypsum lumps. While the waste gypsum is moved in the casing 16, the gypsum adhering to the piece of paper is repeatedly hit and falls off from the piece of paper and is discharged from the mesh 22, so that the amount of gypsum adhering to the piece of paper and discharged is small. Empirically, when the opening diameter D is 12 mm or more, 90% or more of the gypsum component can be taken out from the opening 25. When the opening diameter D is 30 mm or less, preferably 20 mm or less, it is possible to reduce the amount of paper pieces and heavy foreign matter that enter the second-stage mill 3, and large-sized heavy foreign matter is mixed into the second-stage mill 3 and meshed. Can be prevented from damaging. If the opening of the mesh of the mill 2 is less than 12 mm, not only the mesh will be damaged, but also the amount of gypsum discharged from the discharge port 19 will increase together with the piece of paper.

紙片はコシがあるため小さなサイズに破砕されにくく、大部分は排出口19から排出される。金具、モルタル、コンクリートなどの重量異物の多くも、排出口19から排出される。しかし紙片と重量異物の一部は、石膏塊と共に出口21から２段目のミル3に投入される。 Since the pieces of paper are stiff, they are not easily crushed into small sizes, and most of them are discharged from the discharge port 19. Many heavy foreign substances such as metal fittings, mortar, and concrete are also discharged from the discharge port 19. However, a piece of paper and a part of heavy foreign matter are thrown into the second stage mill 3 from the outlet 21 together with the gypsum lump.

２段目のミル3には大きなサイズの重量異物は投入されないので、メッシュは1段目のミル2のメッシュよりも薄くても良い。2段目のミル3で、投入口18から排出口19へ移動する間にハンマー12による打撃を繰り返し受けて、石膏塊から紙片と石膏とがさらに分離し、また重量異物も石膏から分離する。そして石膏塊は破砕されて石膏粒体となる。そして発明者の経験では、２段目のミル3のメッシュ22の開口径Ｄを3mm以上で12mm以下、好ましくは5mm以上で10mm以下とすると、紙片及び重量異物を石膏から充分に分離でき、かつメッシュの損傷も防止できる。なお２段目のミル3では、メッシュの開口を１段目のミル2のメッシュよりも小さくする。 Since no large-sized heavy foreign matter is thrown into the second-stage mill 3, the mesh may be thinner than the mesh of the first-stage mill 2. The second-stage mill 3 is repeatedly hit by the hammer 12 while moving from the input port 18 to the discharge port 19, further separating the piece of paper and the gypsum from the gypsum block, and also separating heavy foreign matter from the gypsum. Then, the gypsum mass is crushed into gypsum granules. In the experience of the inventor, when the opening diameter D of the mesh 22 of the second stage mill 3 is 3 mm or more and 12 mm or less, preferably 5 mm or more and 10 mm or less, paper pieces and heavy foreign substances can be sufficiently separated from the gypsum. Damage to the mesh can also be prevented. In the second-stage mill 3, the mesh opening is made smaller than that of the first-stage mill 2.

なお２段目のミル3から得られた石膏粒体を、粉砕装置5によりさらに粉砕しても良く、粉砕後に磁選機、比重分離装置などにより、石膏から他の成分をさらに分離しても良い。 The gypsum granules obtained from the second-stage mill 3 may be further crushed by the crushing device 5, and after crushing, other components may be further separated from the gypsum by a magnetic separator, a specific gravity separation device, or the like. ..

メッシュ22の開口のサイズについて説明する。円形の開口25では、開口の直径Ｄを開口のサイズとする。円形以外の開口では、例えば開口の内接円の直径を開口のサイズとする。例えば図５の開口30、図６の開口40では、鎖線で示す内接円の直径Ｄを開口のサイズとする。 The size of the opening of the mesh 22 will be described. In the circular opening 25, the diameter D of the opening is the size of the opening. For openings other than a circle, for example, the diameter of the inscribed circle of the opening is taken as the size of the opening. For example, in the opening 30 of FIG. 5 and the opening 40 of FIG. 6, the diameter D of the inscribed circle indicated by the chain line is taken as the size of the opening.

実施例では以下の効果が得られる。
・ ミル2,3の投入口18から排出口19へ移動する間に、回転するハンマー12により廃石膏に繰り返し打撃を加える。打撃により紙片から石膏が脱落し、石膏と紙片を効果的に分離できる。
・ １段目のミル2のメッシュの開口を12mm以上30mm以下、好ましくは14mm以上20mm以下とすることにより、破砕した石膏塊をメッシュを通じて素早く排出でき、かつメッシュを肉厚にできるのでメッシュの損傷も防止できる。
・ ２段目のミル3のメッシュの開口を3mm以上12mm以下、好ましくは5mm以上10mm以下とし、かつ１段目のミルのメッシュの開口よりも小さくすることにより、紙片及び重量異物を石膏から充分に分離できる。大きな重量異物は１段目のミル2で分離済みであるため、メッシュの開口を小さくしても、２段目のミル3のメッシュは損傷し難い。
In the examples, the following effects can be obtained.
-While moving from the input port 18 to the discharge port 19 of the mills 2 and 3, the waste gypsum is repeatedly hit by the rotating hammer 12. The gypsum falls off from the piece of paper by hitting, and the gypsum and the piece of paper can be effectively separated.
・ By setting the opening of the mesh of the first stage mill 2 to 12 mm or more and 30 mm or less, preferably 14 mm or more and 20 mm or less, the crushed gypsum mass can be quickly discharged through the mesh and the mesh can be thickened, so that the mesh is damaged. Can also be prevented.
-By making the opening of the mesh of the second-stage mill 3 3 mm or more and 12 mm or less, preferably 5 mm or more and 10 mm or less, and smaller than the opening of the mesh of the first-stage mill, a piece of paper and heavy foreign matter can be sufficiently removed from the gypsum. Can be separated into. Since the large heavy foreign matter has already been separated by the first-stage mill 2, the mesh of the second-stage mill 3 is not easily damaged even if the mesh opening is made smaller.

2,3 ミル
4 比重選別装置
5 粉砕装置
6 サイロ
7 か焼機
8 晶析装置
9 固液分離装置
10 回転軸
12 ハンマー
14 モータ
15 軸受
16 ケーシング
18 投入口
19 排出口
20 カバー
21 出口
22 メッシュ
24 金属板
25 開口
30,40 開口 2,3 mils
4 Specific density sorting device
5 Crusher
6 silo
7 Calcination machine
8 Crystallizer
9 Solid-liquid separator
10 axis of rotation
12 hammer
14 motor
15 bearings
16 Casing
18 Input port
19 Outlet
20 cover
21 Exit
22 mesh
24 Metal plate
25 openings
30,40 Aperture

Claims (1)

１段目と２段目の２台のミルを用いて廃石膏を破砕する方法であって、
当該ミルはいずれも、一端部に投入口を他端部に排出口を備え、かつ投入口と排出口の間にメッシュを有するケーシングを備え、ケーシング内でハンマーを備えた回転軸を回転させるミルであり、
１段目のミルでは前記メッシュの開口を12mm以上30mm以下とし、
２段目のミルでは前記メッシュの開口を3mm以上12mm以下とし、かつ２段目のミルのメッシュの開口を１段目のミルのメッシュの開口よりも小さくし、
１段目のミルの投入口から廃石膏を投入し、
１段目のミルのメッシュを通過した廃石膏を２段目のミルの投入口から投入し、
１段目のミルと２段目のミルの排出口から紙片と異物を得、
２段目のミルのメッシュから廃石膏粒体を得ることを特徴とする、廃石膏の破砕方法。 It is a method of crushing waste gypsum using two mills, one for the first stage and the other for the second stage.
All of the mills have a loading port at one end and a discharging port at the other end, and a casing having a mesh between the loading port and the discharging port is provided, and a rotary shaft equipped with a hammer is rotated in the casing. And
In the first stage mill, the opening of the mesh is 12 mm or more and 30 mm or less.
In the second stage mill, the opening of the mesh is 3 mm or more and 12 mm or less, and the mesh opening of the second stage mill is smaller than the mesh opening of the first stage mill.
Put the waste gypsum from the inlet of the first stage mill,
The waste gypsum that has passed through the mesh of the first stage mill is poured from the inlet of the second stage mill.
Obtain a piece of paper and foreign matter from the outlets of the first and second mills,
A method for crushing waste gypsum, which comprises obtaining waste gypsum granules from a mesh of a second-stage mill.
JP2020127415A 2020-07-28 2020-07-28 Method of crushing waste gypsum Pending JP2022024689A (en)

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JP3126091B2 (en) * 1994-05-10 2001-01-22 チヨダセラ株式会社 Board crushing equipment
US6164572A (en) * 1996-07-26 2000-12-26 Tudahl; Daniel L. Apparatus and method for recycling gypsum wallboard
JP3556627B2 (en) * 2001-09-03 2004-08-18 育三 大嶽 Waste coarse crusher, waste crusher / separator, fine crusher, and waste treatment system
JP2004243165A (en) * 2003-02-12 2004-09-02 Toda Constr Co Ltd Method for classifying and recycling gypsum board
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