WO2013145872A1 - 磁選機 - Google Patents
磁選機 Download PDFInfo
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- WO2013145872A1 WO2013145872A1 PCT/JP2013/052809 JP2013052809W WO2013145872A1 WO 2013145872 A1 WO2013145872 A1 WO 2013145872A1 JP 2013052809 W JP2013052809 W JP 2013052809W WO 2013145872 A1 WO2013145872 A1 WO 2013145872A1
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- Prior art keywords
- belt
- particles
- magnet unit
- weak magnetic
- magnetic separator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/16—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts
- B03C1/22—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with non-movable magnets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/16—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts
- B03C1/18—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with magnets moving during operation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/16—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C2201/00—Details of magnetic or electrostatic separation
- B03C2201/20—Magnetic separation whereby the particles to be separated are in solid form
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B34/00—Obtaining refractory metals
- C22B34/20—Obtaining niobium, tantalum or vanadium
- C22B34/24—Obtaining niobium or tantalum
Definitions
- the present invention recycling industry, suitable in the field of food and materials for performing the powder sorting, there relates magnetic separator for sorting particles using a magnetic, in particular, the particles conveyed by the belt conveyor in contrast, it relates to weak magnetic magnetic separator which only the magnetization recovery ferromagnetic particles magnetized by a weak force by hanging magnet unit suspended from the top of the belt conveyor.
- the magnetic separator is one of the most popular particle separation devices that are generally widely used. Iron scraps are magnetically attracted and captured by magnets suspended from the top, magnets stored in conveyor pulleys, or magnets arranged on the left and right sides of the particle flow path, and separated from non-magnetic particles. Is the method. In addition to permanent magnets, electromagnets and superconducting magnets may be used as magnets. There is also a method of increasing the magnetization gradient by arranging a matrix such as a fine iron wire between magnets. Both are devised to magnetically capture particles and fine particles having weaker magnetism.
- the conventional magnetic separator has a technical problem of how many particles are magnetically captured by a strong magnetic attractive force (magnetic flux density, magnetization gradient).
- Patent Document 1 clearly describes that this is performed by reducing the sensitivity (magnetic force) of the magnetic separator.
- Patent Document 2 describes that only a ferromagnetic material is magnetized by opening a gap with particles on a conveyor using a suspension type magnetic separator as in the present invention.
- shape separation devices there are two types of shape separation devices: a sensing / sorting device that judges from images monitored by a camera, etc., and a mechanical device that uses rolling surfaces such as inclined surfaces. Is included.
- the mechanical shape sorter includes a centrifugal type, a vibration type, a tilt type, and the like, but there are tilted belt type particle sorters using a conveyor belt as disclosed in Patent Documents 3 to 5. . Furthermore, there is a combination of an inclined belt sorter and a magnetic separation function in which a magnet is stored on the lower surface of the belt (see Patent Document 6).
- JP 2006-75793 A Japanese Patent Laid-Open No. 5-146708 JP 2001-9380 A Japanese Patent No. 3508279 Japanese Patent No. 4001830 Japanese Patent Application Laid-Open No. 2005-118685 JP 2010-214352 A
- Patent Document 7 discloses a primary concentration method in which elements mounted on a printed circuit board are separated and collected, and the elements separated and collected are screened and screened to collect particles having the same size range as a tantalum capacitor.
- a secondary concentration step that collects the same specific gravity range as the tantalum capacitor from the primary concentrated product by specific gravity selection, and a non-magnetized material is recovered from the secondary concentrated product by weak magnetic separation to obtain a highly concentrated product of the tantalum capacitor.
- a tantalum capacitor recycling method characterized in that the third concentration step requires a weak magnetic separator that performs weak magnetic separation.
- a cylindrical element such as an aluminum electrolytic capacitor may be extracted from the mixed element group by rolling down the inclined surface.
- the cylindrical side surface portion is not supplied so as to face the inclined direction when it is supplied onto the belt, it remains on the belt like the rectangular particles.
- the small rectangular element rolls down the inclination, so that accurate shape separation cannot be performed.
- the problem to be solved by the present invention is to provide an apparatus for magnetically collecting only ferromagnetic particles. It is another object of the present invention to provide an apparatus capable of achieving accurate shape separation of cylindrical particles in a compact apparatus in which a magnetic conveyor for conveying magnetic material is inclined.
- the present invention includes a belt conveyor that conveys the particles to be sorted, and a suspended magnet unit that is provided above the belt conveyor so as to be separated from the belt conveyor. It is a weak magnetic separator that magnetizes and collects a ferromagnetic material by magnetizing the particles to be sorted conveyed on a conveyor belt with a low magnetic force without unevenness, and does not collect a weak magnetic material.
- the magnet unit has a length in the longitudinal direction larger than the belt width of the belt, the longitudinal direction of the magnet unit coincides with the belt width direction, and both ends of the magnet unit protrude from the belt width,
- the magnet is installed in such a way that the distance from the surface of the belt is a constant distance in the longitudinal direction, so that the magnet is within a weak magnetic force range of more than 0 and less than 700 gauss. Variation of the magnetic flux density in the belt width direction in the belt surface position knit facing is equal to or less than 10%.
- the present invention provides the above-described weak magnetic separator, wherein the belt of the belt conveyor is inclined at a right angle from the traveling direction of the belt, and the shape of the particles to be sorted rolls down on the inclined surface due to gravity.
- the present invention provides the above-described weak magnetic separator, wherein at least one swing-type pin gate is provided above the belt of the belt conveyor, and the particles to be sorted in contact with the belt contact the pins of the pin gate. By doing so, a change in posture of the particles to be sorted on the belt is promoted. Further, the present invention provides the above-mentioned weak magnetic separator, wherein particles having the same size range as the tantalum capacitor are collected from the elements separated and collected from the used printed circuit board as the particles to be sorted, and then primarily concentrated, and further selected by specific gravity. By using a secondary concentrated secondary concentrated product recovered from the same specific gravity range as that of the tantalum capacitor, the product transported from the belt conveyor without being magnetically recovered is used as a highly concentrated product of the tantalum capacitor.
- the weak magnetic separator of the present invention does not use a roll type such as a magnetic pulley that tends to cause uneven magnetic force on the belt, but employs a suspended magnet unit.
- the size of the magnet unit is made larger than the belt width, and the particles transported on the belt in the portion near the center excluding both ends of the magnet unit have a uniform and low magnetic force.
- magnetizing it is possible to collect all the ferromagnetic materials and collect no weak magnetic material.
- the suspended magnet unit is equipped with an up / down fine movement device as required, and has a function of moving the range from approximately 2 cm to 50 cm up and down from the belt surface in units of mm.
- the magnetic flux density at can be adjusted.
- the introduction of a new mechanism that separates the shape of the conveyor belt, rather than a simple conveying means allows the shape separation device to be used in combination, so that the “spherical / cylindrical particles” and “strong” It becomes possible to select the three components of “magnetic particles” and “other particles” with high accuracy.
- the cylindrical particle changes its posture by contact with the obstacle and changes its posture. If the side faces in the direction of inclination in the process, the inclined surface immediately rolls down, promoting shape separation and improving the accuracy of shape separation.
- the pin since the pin is a swing-type pin gate, it does not cause blockage due to particle accumulation by the pin, and an excessive load is not applied to both the pin and the particles to be sorted.
- Example of this invention it is a figure which shows the magnetic flux density distribution of the belt width direction according to the suspension magnet unit and the distance between belts. It is a figure for demonstrating the motion of each particle
- the present invention includes a belt conveyor for conveying a sorting particles, the suspended magnet unit provided with spaced above the belt conveyor, the magnet unit, unevenness to be sorted particles to be conveyed on a belt It is a weak magnetic separator that collects all ferromagnetic materials by magnetizing with a low magnetic force without any magnetic force and does not collect weak magnetic materials at all.
- the suspended magnet unit has a length in the longitudinal direction. Is larger than the belt width, the longitudinal direction of the magnet unit is aligned with the belt width direction, and both ends of the magnet unit are protruded from the belt width so that the separation distance from the belt surface is a constant distance in the longitudinal direction.
- a weak magnetic magnetic separator characterized in that at most 0%.
- it is not a roll type such as a magnetic pulley that easily causes unevenness of magnetic force on the belt, but a suspended magnet unit is adopted, and both ends of the magnet unit that easily generates unevenness of magnetic force are not used.
- a plate magnet having a length of 45 cm in the longitudinal direction is used as a magnetic separator with a belt width of 30 cm.
- the hanging magnet has a function of moving up and down in the range of 2 cm to 50 cm from the belt surface by providing a vertical fine movement device as necessary. From this, generally more than 0 700 gauss (more than 0 0.07 Tesla: [T] or less) with covering a very low magnetic flux density range of generally uneven magnetic flux density of the belt surface, as shown in FIG. 1 It is characterized by being within 10%.
- the vertical axis represents the magnetic flux density [tesla] ([T])
- the horizontal axis represents (the distance from the center) belt width indicates [mm]
- the distance between the hanging magnet unit and the belt 0 mm (i.e. belt In the case of 25 mm, 50 mm, 75 mm, and 100 mm, the magnetic flux density distribution in the belt width direction is plotted, and it can be seen that there is almost no unevenness in the magnetic flux density distribution.
- the present invention provides the above-mentioned weak magnetic separator, by introducing a new mechanism for promoting shape separation by inclining the belt of the belt conveyor in a direction perpendicular to the traveling direction as shown in FIG.
- the device is also used as a compact device, and it is possible to sort into three components of “spherical / cylindrical particles”, “ferromagnetic particles” and “other particles” with high accuracy while being a compact device.
- Electronic devices include flat ones such as ICs and memories, rectangular ones such as tantalum capacitors, and cylindrical ones such as aluminum electrolytic capacitors. Since there are few spherical particles, it is an aluminum electrolytic capacitor that can be expected to roll by an inclined belt.
- reference numeral 1 indicates a suspended magnet unit
- reference numeral 2 indicates a belt
- reference numeral 3 indicates a sample supply position
- reference numeral 4 indicates cylindrical particles
- reference numeral 5 indicates non- Magnetic and weak magnetic rectangular particles are shown.
- Reference numeral 6 denotes a ferromagnetic rectangular particle.
- Reference numeral X denotes a belt conveying direction.
- Reference numeral ⁇ denotes an inclination of the belt surface of the belt 2. As shown in FIG. 2, the inclination indicates an inclination in which the belt surface of the belt 2 has a left shoulder downward (or right shoulder downward) with respect to a horizontal plane in the belt conveyance direction view.
- the present invention provides the above-mentioned weak magnetic separator, in which the particles B having the end faces directed in the inclined direction (that is, the side faces directed in the conveying direction of the conveyor) are arranged on the belt in the middle of the conveying of the conveyor.
- the cylindrical particles changed their posture by contact with the obstacle, and the side faced in the inclined direction in the process of changing the posture, so that the inclined surface immediately rolled down.
- the pin must be fixed to the device so as to hang from the belt. Also, in order to ensure contact with the particles, it is desirable to install a large number of pins in the inclined direction instead of one.
- this swing-type pin gate is formed from a plate (pin gate 10) provided with a large number of pins 11 attached to a rotating shaft 12 rotatable in the forward direction of the belt conveyance direction X as shown in FIG. It consists of a structure that hangs down.
- the pin gate 10 hangs vertically with respect to the belt 2 according to gravity in a state where the pin gate 10 is not in contact with the particle. Due to the movement of the particles, the pin gate 10 swings around the rotation shaft 12 in the traveling direction of the belt 2 to prevent the particles from being blocked. Since the side surface may not be inclined in a single contact, it is desirable to install the pin gates 10 at three or more locations in order to obtain certainty.
- the weak magnetic separator of the present invention can be applied to various mixed particle groups of 0.1 mm or more, mainly 1 mm or more and 80 mm or less (preferably 30 mm or less). Examples of the electronic element group peeled from the waste printed circuit board.
- the present inventors have already proposed a method of highly concentrating only a tantalum capacitor from a mixed electronic element group by three steps of screening (sieving), airflow selection, and magnetic separation in “Recycling Method of Tantalum Capacitor” of Patent Document 7. I have applied.
- Patent Document 7 as a method of removing the crystal resonator coexisting with the tantalum capacitor after airflow selection, the crystal resonator is usually magnetized only, and the tantalum capacitor is usually not magnetized regardless of the presence or absence of the lead wire. It is specified that magnetic separation at a low magnetic force of 240 Gauss (0.024 Tesla), which is not performed, is performed.
- the weak magnetic separator of the present invention not only satisfies this condition, but is an apparatus that can individually collect cylindrical aluminum electrolytic capacitors at the inclined belt portion.
- the function of the inclined belt-type shape separation device with swing pin gate is given to the low-magnetic separator and the conveyor for realizing the uniform low magnetic force according to the present invention.
- the recovery test of tantalum capacitors it was possible to achieve more accurate element selection. That is, the removal test of the quartz resonator and the aluminum electrolytic capacitor that coexist with the tantalum capacitor (impurities) was performed on the mixed element simulation sample that is close to the tantalum capacitor in particle size and specific gravity (highly difficult to sort). As a result, it was possible to remove the crystal resonator by the weak magnetic separation function and the aluminum electrolytic capacitor by the inclined belt selection function.
- the machine of the present invention is compact and can be continuously supplied and discharged, and can process elements of about 20 kg / h with a 1 m long conveyor and about 40 kg / h with a 2 m long conveyor. Yes, it is extremely practical.
- the present invention has been developed with the weak magnetic separator in the recycling industry in mind. Can be used as a machine.
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- Combined Means For Separation Of Solids (AREA)
Abstract
Description
一方、形状分離装置は、カメラなどでモニターした映像から判断するセンシング・ソーティング装置と、傾斜面などの転がりを利用した機械式のものがあり、さらに、気流選別式のものではその選別因子に形状が含まれる。機械式の形状選別装置には、遠心式、振動式、傾斜式などの方式があるが、コンベアベルトを用いた傾斜ベルト型の粒子選別装置については、特許文献3~5に示されるものがある。
さらに、傾斜ベルト選別機と磁選機能を組み合わせたものについては、ベルト下面に磁石を格納したものがある(特許文献6参照)。
例えば、プリント基板から剥離した電子素子を、磁選機を用いて種類ごとに選別することを考える。希土類天然磁石や電磁石、超伝導磁石など、高度な磁選機で発揮される高い磁気吸引力を以て選別すると、ニッケルコーティングや、わずかな鉄分にも反応して、素子の大部分が磁着してしまい、素子の種類別選別は達成されない。普及型の磁選機(磁束密度0.1T以上)を用いると、鉄分が多い素子、素子に接続したリード線が磁着することによって素子が回収される。しかし、例えばタンタルコンデンサなどでは、プリント基板から剥離した際、リード線付きで剥離した場合と、リード線なしで剥離した場合などが生じるため、この方法で磁選をすると、同一素子が、磁着産物と非磁着産物に分かれてしまう。
一方、例えば、プリント基板から剥離した電子素子のうち、アルミ電解コンデンサなど円筒形素子は、傾斜面を転がり落ちることにより、混合素子群から抜き出せる可能性がある。しかし、従来の傾斜ベルト型形状分離装置では、ベルト上に供給する際、円筒形の側面部が傾斜方向に向くように供給しないと、矩形粒子と同様にベルト上に残ってしまう。また、振動などを与えると、小さな矩形素子は傾斜を転がり落ちてしまうため、精度良い形状分離ができない。
本発明が解決しようとする課題は、強磁性粒子のみを磁着回収する装置を提供することにある。さらに、磁選用の搬送コンベアを傾斜させたコンパクトな装置の中で、円筒形粒子の精度良い形状分離をも達成させる装置を提供することにある。
また、本発明は、上記弱磁力磁選機において、前記ベルトコンベアの前記ベルトを、前記ベルトの進行方向から直角方向に傾斜させて設け、前記被選別粒子のうち重力により傾斜面を転がり落ちる形状のものと、重力により傾斜面を転がり落ちない形状のものとに形状選別することを特徴とする。
また、本発明は、上記弱磁力磁選機において、前記ベルトコンベアの前記ベルト上方に少なくとも1個のスイング型のピンゲートを設け、前記ベルト上の搬送中の前記被選別粒子が前記ピンゲートのピンに接触することにより前記被選別粒子の前記ベルト上での姿勢変化を促すようにしたことを特徴とする。
また、本発明は、上記弱磁力磁選機において、前記被選別粒子として、使用済みプリント基板から剥離回収した素子類からタンタルコンデンサと同一の寸法範囲の粒子を回収して一次濃縮し、さらに比重選別により前記タンタルコンデンサと同じ比重範囲のものを回収した二次濃縮した二次濃縮産物を用い、磁着回収されずに前記ベルトコンベアから搬出されたものを前記タンタルコンデンサの高濃縮産物とすることを特徴とする。
また、本発明の一の形態では、コンベヤベルトを単なる搬送手段でなく、形状分離させる新機構の導入により、形状分離装置を兼務させ、コンパクトな装置でありながら「球形・円筒形粒子」「強磁性粒子」「その他の粒子」の3成分に高精度に選別することが可能となる。
さらに、本発明の他の一の形態では、コンベアの搬送途中のベルト上に設置した細いピンの障害物を設置したので、円筒形粒子は障害物との接触により、姿勢を変え、姿勢を変える過程で側面が傾斜方向に向けば、直ちに傾斜面を転がり落ちることとなり、形状分離を促進させて形状分離の精度が向上する。また、ピンはスイング型のピンゲートとすることにより、ピンによる粒子溜まりによる閉塞を発生することなく、ピン及び被選別粒子の双方に対して過度な負荷がかかることもない。
例えば廃プリント基板から剥離した電子素子を種類別に選別することを考える。電子素子にはICやメモリのような扁平状のもの、タンタルコンデンサのように直方体のもの、アルミ電解コンデンサのように円筒形のものなどがある。球形の粒子はほとんどないため、傾斜ベルトによる転がりが期待できるのはアルミ電解コンデンサである。
なお、図2中の符号1は、つり下げ磁石ユニットを示し、符号2は、ベルトを示し、符号3は、試料供給位置を示し、符号4は、円筒形粒子を示し、符号5は、非磁性・弱磁性矩形粒子を示し、符号6は、強磁性矩形粒子を示し、符号Xは、ベルト搬送方向を示し、符号θは、ベルト2のベルト面の傾斜を示す。傾斜は、図2に示されるように、ベルト搬送方向視で、水平面に対して、ベルト2のベルト面が左肩下がり(又は右肩下がり)となる傾斜を示す。
そこで、本発明は、上記弱磁力磁選機において、端面を傾斜方向に向けた(すなわち、側面をコンベアの搬送方向に向けた)粒子Bを、コンベアの搬送途中のベルト上に設置した細いピンの障害物を設置することで、円筒形粒子は障害物との接触により、姿勢を変えさせ、姿勢を変える過程で側面が傾斜方向に向かせるようにして、直ちに傾斜面を転がり落ちるようにした。ここで、ピンはベルト上からつり下げるように装置に固定されていなければならない。また、粒子との接触を確実にするにはピンは1本でなく、傾斜方向に向かって多数本設置することが望まれる。しかし、あまり多すぎてピンの間隔が狭くなると、粒子自体がピンを通過できず、粒子が溜まって閉塞を起こしてしまう。粒子の間隔が広ければ接触せずに通過してしまう粒子が増える。そこで、粒子溜まりによる閉塞を防止しつつ、ピンと粒子との確実な接触を維持するため、スイング型のピンゲートを採用した。このスイング型のピンゲートは、図3のようにベルト搬送方向Xと順方向に回転可能な回転軸12に取り付けられる多数のピン11を備えた板(ピンゲート10)を、ベルト2の上から暖簾状に垂らした構成からなる。ピンゲート10は、粒子と接触していない状況では、重力に従って、ベルト2に対して垂直に垂れ下がっているが、粒子と接触をすると、粒子の姿勢を変えるきっかけを与えながら、ベルト2の移動に伴う粒子の移動により、ピンゲート10が回転軸12を中心に、ベルト2の進行方向にスイングして、粒子の閉塞を妨げる。一度の接触で、側面が傾斜方向に向かないこともあるため、確実性を求めるためピンゲート10は3カ所以上に設置することが望ましい。
特許文献7による「タンタルコンデンサのリサイクル方法」に基づき、本発明の均一な低磁力を実現した低磁力磁選機とその搬送コンベアに、スイングピンゲート付き傾斜ベルト型形状分離装置の機能を持たせることによって、タンタルコンデンサの回収試験を行うと、さらに精度の高い素子選別を実現できた。すなわちタンタルコンデンサと粒径および比重が近接する(極めて選別困難度の高い)混合素子模擬試料に対して、タンタルコンデンサと共存する(不純物である)水晶振動子とアルミ電解コンデンサの除去試験を行った結果、弱磁力磁選機能で水晶振動子を、傾斜ベルト選別機能でアルミ電解コンデンサを除去することが可能であった。また、本発明機はコンパクトでありながら、連続供給・排出が可能であるとともに、長さ1mのコンベアで素子を約20kg/h、長さ2mのコンベアで約40kg/h処理することが可能であり、極めて実用性に富むものである。
2 ベルト
3 試料供給位置
4,A,B 円筒形粒子
5 非磁性・弱磁性矩形粒子
6 強磁性矩形粒子
10 ピンゲート
11 ピン
12 回転軸
X ベルト搬送方向
θ 傾斜
Claims (4)
- 被選別粒子を搬送するベルトコンベアと、前記ベルトコンベアの上方に離間して設けられたつり下げ型磁石ユニットを有し、当該磁石ユニットが、前記ベルトコンベアのベルト上で搬送される前記被選別粒子をムラのない低磁力で磁着させることにより、強磁性体を磁着回収するとともに、弱磁性体を磁着回収しない弱磁力磁選機であって、
前記磁石ユニットは、その長手方向の長さが前記ベルトのベルト幅より大きく、前記磁石ユニットの長手方向をベルト幅方向に一致させ、かつ、前記磁石ユニットの両端を前記ベルト幅より突出させ、前記ベルトの表面からの離間距離が長手方向にわたって一定距離になるように設置されることにより、0を超え700ガウス以下の弱い磁力範囲内で、前記磁石ユニットと対向する前記ベルト表面での前記ベルト幅方向における磁束密度のばらつきが10%以下であることを特徴とする弱磁力磁選機。 - 前記ベルトコンベアの前記ベルトを、前記ベルトの進行方向から直角方向に傾斜させて設け、前記被選別粒子のうち重力により傾斜面を転がり落ちる形状のものと、重力により傾斜面を転がり落ちない形状のものとに形状選別することを特徴とする請求項1に記載の弱磁力磁選機。
- 前記ベルトコンベアの前記ベルト上方に少なくとも1個のスイング型のピンゲートを設け、前記ベルト上の搬送中の前記被選別粒子が前記ピンゲートのピンに接触することにより前記被選別粒子の前記ベルト上での姿勢変化を促すようにしたことを特徴とする請求項2に記載の弱磁力磁選機。
- 前記被選別粒子として、使用済みプリント基板から剥離回収した素子類からタンタルコンデンサと同一の寸法範囲の粒子を回収して一次濃縮し、さらに比重選別により前記タンタルコンデンサと同じ比重範囲のものを回収した二次濃縮した二次濃縮産物を用い、磁着回収されずに前記ベルトコンベアから搬出されたものを前記タンタルコンデンサの高濃縮産物とすることを特徴とする請求項1ないし3のいずれか1項に記載の弱磁力磁選機。
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