JP5768937B2 - Apparatus and method for removing powder adhering to steelmaking raw material - Google Patents

Apparatus and method for removing powder adhering to steelmaking raw material Download PDF

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JP5768937B2
JP5768937B2 JP2014518264A JP2014518264A JP5768937B2 JP 5768937 B2 JP5768937 B2 JP 5768937B2 JP 2014518264 A JP2014518264 A JP 2014518264A JP 2014518264 A JP2014518264 A JP 2014518264A JP 5768937 B2 JP5768937 B2 JP 5768937B2
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JPWO2013179609A1 (en
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榎枝　成治
成治 榎枝
西名　慶晃
慶晃 西名
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B07B1/282—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens their jigging movement being a closed or open curvilinear path in a plane perpendicular to the plane of the screen and parrallel or transverse to the direction of conveyance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
    • 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
    • C22B1/00—Preliminary treatment of ores or scrap

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Description

本発明は、塊状の製鉄原料の表面に付着する微粒を除去するための、製鉄原料付着粉の除去装置および除去方法に関する。   The present invention relates to an apparatus and a method for removing powders attached to a steelmaking raw material for removing fine particles adhering to the surface of a massive ironmaking raw material.

高炉原料である塊鉱石は、通常、原料ヤードに山積みの状態で貯留されている。そのため、降雨時には、塊鉱石が濡れて、例えば５〜５０ｍｍの粒径である塊鉱石の表面に５ｍｍ以下の粒径の微粒鉄鉱石が付着する。塊鉱石がこのままの状態で高炉へ装入されると、塊鉱石の平均粒径が小さくなり、炉内の通気抵抗が増すので生産性が低下する。
そこで、塊鉱石を高炉へ装入する前に、塊鉱石の表面に付着した５ｍｍ以下の微粒（塊鉱石付着粉）を除去する高炉装入前処理が行われている。The lump ore, which is a blast furnace raw material, is normally stored in a piled state in the raw material yard. Therefore, at the time of rain, the lump ore gets wet and fine iron ore having a particle size of 5 mm or less adheres to the surface of the lump ore having a particle size of 5 to 50 mm, for example. When the lump ore is charged into the blast furnace in this state, the average particle size of the lump ore becomes small, and the ventilation resistance in the furnace increases, so the productivity decreases.
Therefore, before charging the lump ore into the blast furnace, pretreatment for charging the blast furnace is performed to remove fine particles of 5 mm or less (lump ore adhesion powder) adhering to the surface of the lump ore.

従来、塊鉱石付着粉を除去する方法としては、以下のような方法が開示されている。
例えば、特許文献１には、塊鉱石を水洗して付着粉を除去する方法が提案されている。Conventionally, the following methods are disclosed as a method of removing lump ore adhesion powder.
For example, Patent Document 1 proposes a method of washing the lump ore with water to remove the adhering powder.

また、振動篩を用いて付着粉を除去する方法が提案されている。振動篩は、片振幅数ｍｍ、振動数数百Ｈｚ以上で篩網を振動させて、篩網上で塊鉱石を移動させながら、付着粉を篩網下へ除去するものである。   In addition, a method for removing adhered powder using a vibrating sieve has been proposed. The vibrating sieve vibrates the sieve mesh with a half amplitude of several mm and a vibration of several hundred Hz or more, and removes adhering powder under the sieve mesh while moving the lump ore on the sieve mesh.

特開平０７−１１３１２７公報Japanese Patent Laid-Open No. 07-113127

しかし、特許文献１に記載の塊鉱石を水洗して付着粉を除去する方法は、大量の水を使用し、かつ、付着粉除去後の水処理のため、シックナーやフィルタープレスなどの設備が必要となる上に、水洗して濡れた塊鉱石を直接高炉へ送ることができないので、濡れた塊鉱石を乾燥するための熱源設備が必要となる。   However, the method of removing the adhering powder by washing the block ore described in Patent Document 1 uses a large amount of water and requires equipment such as a thickener and a filter press for water treatment after the adhering powder is removed. In addition, since the wet ore that has been washed and wetted cannot be sent directly to the blast furnace, a heat source facility for drying the wet ore is required.

また、振動篩を用いて付着粉を除去する方法は、次のような問題がある。すなわち、前述したように、塊鉱石は原料ヤードに山積み状態で貯留しているため、降雨時に塊鉱石表面が濡れて付着粉が粘着性を持つ。この状態では、振動篩を使用した場合、付着粉が篩目に詰まりやすくなり、付着粉の除去効率が低下する。   Moreover, the method of removing adhering powder using a vibration sieve has the following problems. That is, as described above, the lump ore is stored in the raw material yard in a piled state, so that the surface of the lump ore gets wet during rainfall and the adhered powder has stickiness. In this state, when a vibrating sieve is used, the adhering powder is easily clogged with the sieve, and the removal efficiency of the adhering powder decreases.

本発明は、上記のような事情に鑑みてなされたものであり、製鉄原料の表面に付着した付着粉を効率良く除去することができる製鉄原料付着粉の除去装置および除去方法を提供することを目的とするものである。   This invention is made in view of the above situations, and provides the removal apparatus and removal method of the iron-making raw material adhesion powder which can remove efficiently the adhesion powder adhering to the surface of an iron-making raw material. It is the purpose.

上記課題を解決するために、本発明は以下の特徴を有する。
［１］ 製鉄原料の表面に付着した付着粉を除去する装置であって、傾斜スクリーンを有し、該傾斜スクリーンが片振幅A、角速度ωで振動し、角速度ωが（ｇ／A）１／２以上、（３．３ｇ／A）１／２以下である製鉄原料付着粉の除去装置。In order to solve the above problems, the present invention has the following features.
[1] An apparatus for removing powder adhering to the surface of a steelmaking raw material, having an inclined screen, the inclined screen vibrates with a half amplitude A and an angular velocity ω, and the angular velocity ω is (g / A) 1 / The removal apparatus of the iron-making raw material adhesion powder | flour which is 2 or more and (3.3g / A) 1/2 or less.

［２］前記該傾斜スクリーンが、揺動運動する傾斜スクリーンであり、片振幅４０〜５０ｍｍ、回転数１７０〜２１０ｒｐｍの傾斜逆回転方向の円運動する偏心駆動機構を有する［１］に記載の製鉄原料付着粉の除去装置。 [2] The steel manufacturing apparatus according to [1], wherein the inclined screen is an inclined screen that swings and has an eccentric drive mechanism that performs a circular movement in a reverse rotation direction with a single amplitude of 40 to 50 mm and a rotation number of 170 to 210 rpm. Raw material adhering powder removal device.

［３］前記該傾斜スクリーンが、上下方向に往復運動する傾斜スクリーンであり、片振幅４０〜５０ｍｍ、振動数１７０〜２１０ｒｐｍの上下方向に往復運動する駆動機構を有する［１］に記載の製鉄原料付着粉の除去装置。 [3] The iron making raw material according to [1], wherein the inclined screen is an inclined screen that reciprocates in the vertical direction, and has a drive mechanism that reciprocates in the vertical direction with a single amplitude of 40 to 50 mm and a frequency of 170 to 210 rpm. Adhering powder removal device.

［４］前記傾斜スクリーンが、５ｍｍ〜１５ｍｍの篩目を有する［１］に記載の製鉄原料付着粉の除去装置。 [4] The apparatus for removing powders attached to a steelmaking raw material according to [1], wherein the inclined screen has a mesh size of 5 mm to 15 mm.

［５］前記篩目が、５ｍｍ〜１０ｍｍである［４］に記載の製鉄原料付着粉の除去装置。 [5] The apparatus for removing powder from an iron-making raw material according to [4], wherein the sieve mesh is 5 mm to 10 mm.

［６］前記傾斜スクリーンが、１０〜２５度の傾斜角度を有する［１］に記載の製鉄原料付着粉の除去装置。 [6] The apparatus for removing powder from an iron-making raw material according to [1], wherein the inclined screen has an inclination angle of 10 to 25 degrees.

［７］片振幅A、角速度ωで振動し、角速度ωが（ｇ／A）１／２以上、（３．３ｇ／A）１／２以下である傾斜スクリーンを有する製鉄原料石付着粉の除去装置を用いて、製鉄原料の表面に付着した付着粉を除去する製鉄原料付着粉の除去方法。[7] Removal of iron-making material stone adhering powder having an inclined screen that vibrates at a single amplitude A and an angular velocity ω, and the angular velocity ω is (g / A) 1/2 or more and (3.3 g / A) 1/2 or less The removal method of the iron-making raw material adhering powder which removes the adhering powder adhering to the surface of the iron-making raw material using an apparatus.

［８］前記該傾斜スクリーンが、揺動運動する傾斜スクリーンであり、片振幅４０〜５０ｍｍ、回転数１７０〜２１０ｒｐｍの傾斜逆回転方向の円運動する偏心駆動機構を有する［７］に記載の製鉄原料付着粉の除去方法。 [8] The iron manufacturing apparatus according to [7], wherein the tilting screen is a tilting screen that swings and has an eccentric drive mechanism that performs a circular motion in a tilt reverse rotation direction with a single amplitude of 40 to 50 mm and a rotation speed of 170 to 210 rpm. Method for removing raw material adhering powder.

［９］前記該傾斜スクリーンが、上下方向に往復運動する傾斜スクリーンであり、片振幅４０〜５０ｍｍ、振動数１７０〜２１０ｒｐｍの上下方向に往復運動する駆動機構を有する［７］に記載の製鉄原料付着粉の除去方法。 [9] The ironmaking raw material according to [7], wherein the inclined screen is an inclined screen that reciprocates vertically, and has a drive mechanism that reciprocates vertically with a single amplitude of 40 to 50 mm and a frequency of 170 to 210 rpm. How to remove adhered powder.

［１０］前記傾斜スクリーンの運動により塊鉱石を跳ね上げて、跳ね上げた塊鉱石を、前記傾斜スクリーンおよび／または前記傾斜スクリーン上の塊鉱石に落下衝突させて、塊鉱石表面に付着した粉を塊鉱石表面から剥がし、該剥がした粉を前記傾斜スクリーンを通過させて塊鉱石と分離することを特徴とする［７］に記載の製鉄原料付着粉の除去方法。 [10] The lump ore is bounced up by the movement of the slant screen, and the lump ore that is bounced up is dropped and collided with the slant screen and / or the lump ore on the slant screen, and the powder adhering to the lump ore surface is removed. Peeling from the lump ore surface, the peeled powder is separated from lump ore by passing through the inclined screen.

［１１］前記製鉄原料が、鉄鉱石、焼結鉱、コークスと石炭である［７］に記載の製鉄原料付着粉の除去方法。 [11] The method for removing powders attached to iron making materials according to [7], wherein the iron making materials are iron ore, sintered ore, coke and coal.

本発明においては、傾斜スクリーンの揺動運動により跳ね上げられた製鉄原料と、傾斜スクリーンあるいは傾斜スクリーン上の製鉄原料との衝突によって、製鉄原料表面の付着粉を効率良く除去することができる。
すなわち、特許文献１のような大量の水を使用することが無いので、製鉄原料を乾燥させる必要がなく、付着粉を除去後の製鉄原料を、直接、高炉等に送ることができる。In the present invention, the adhering powder on the surface of the iron-making material can be efficiently removed by the collision between the iron-making material jumped up by the swinging motion of the tilting screen and the iron-making material on the tilting screen or the tilting screen.
That is, since a large amount of water as in Patent Document 1 is not used, it is not necessary to dry the iron-making raw material, and the iron-making raw material after removing the adhering powder can be directly sent to a blast furnace or the like.

また、製鉄原料が傾斜スクリーン上を飛び上がり、傾斜スクリーン上に着地すると同時に傾斜スクリーンをハンマリングする状態になるので、そのハンマリングによって傾斜スクリーンの篩目に引っ掛かっている付着粉が外れ、振動篩を使用した場合のような篩目の目詰まりが生じ難い。   In addition, since the steelmaking material jumps up on the inclined screen and lands on the inclined screen, the inclined screen is hammered at the same time, so the adhering powder caught on the screen of the inclined screen is removed by the hammering, and the vibrating sieve is removed. It is difficult to cause clogging of the mesh as used.

本発明の実施形態１を示す斜視図である。It is a perspective view which shows Embodiment 1 of this invention. 本発明の実施形態１を示す正面図である。It is a front view which shows Embodiment 1 of this invention. 本発明の実施形態１における製鉄原料の動きを示す側面図である。It is a side view which shows the motion of the iron-making raw material in Embodiment 1 of this invention. 本発明の実施例を示す側面図である。It is a side view which shows the Example of this invention. 本発明の実施例１における付着粉除去効果を示す図である。It is a figure which shows the adhesion powder removal effect in Example 1 of this invention. 本発明の実施例１における付着粉除去効果を示す図である。It is a figure which shows the adhesion powder removal effect in Example 1 of this invention. 本発明の実施例２における付着粉除去効果を示す図である。It is a figure which shows the adhesion powder removal effect in Example 2 of this invention. 本発明の実施例２における付着粉除去効果を示す図である。It is a figure which shows the adhesion powder removal effect in Example 2 of this invention. 本発明の実施形態２を示す斜視図である。It is a perspective view which shows Embodiment 2 of this invention. 本発明の実施形態２を示す正面図である。It is a front view which shows Embodiment 2 of this invention. 本発明の実施形態２における製鉄原料の動きを示す側面図である。It is a side view which shows the motion of the iron-making raw material in Embodiment 2 of this invention.

まず、本発明の原理について説明する。
スクリーンが垂直方向に片振幅A、角速度ωで振動し、網面上に質量ｍの粒子が乗っている1次元モデルを考えと、網面の加速度は（１）式、粒子の運動方程式は（２）式となる。Nは、網面から受ける垂直抗力である。
ｍ・ｄ２ｙ／ｄｔ２＝N - mg （１）
ｄ２Ｙ／ｄｔ２＝−Aω2sinωt （２）
（１）式中のｙは粒子の上下方向変位であり、（２）式中のＹは網面の上下方向の変位である。
粒子が飛び上らない条件（網面と一体になって運動）は、（３）式、（４）式である。
ｙ＝Ｙ （３）
ｄ２ｙ／ｄｔ２＝ｄ２Ｙ／ｄｔ２ （４）
したがって、（１）、（２）式より、下記の（５）式が得られる。
N=m( g−Aω2sinωt ) （５）
Nは０超えであるから、（５）式より、（６）式が得られる。
sinωt ＜ g / Aω2 （６）
sinωtの絶対値は１以下なので、（７）式が得られる。
ω ＜（ｇ／A）１／２ （７）
したがって、粒子が網面を飛び上る角速度条件は、（８）式で表される。
ω ≧（ｇ／A）１／２ （８）First, the principle of the present invention will be described.
Considering a one-dimensional model in which the screen vibrates vertically with a single amplitude A and angular velocity ω, and a particle of mass m is on the mesh surface, the acceleration of the mesh surface is the equation (1) and the equation of motion of the particle is ( 2) N is the vertical drag received from the mesh surface.
m · d 2 y / dt 2 = N-mg (1)
d 2 Y / dt 2 = −Aω 2 sinωt (2)
In the formula (1), y is the vertical displacement of the particles, and Y in the formula (2) is the vertical displacement of the mesh surface.
The conditions that the particles do not fly up (movement with the mesh surface) are the formulas (3) and (4).
y = Y (3)
d 2 y / dt 2 = d 2 Y / dt 2 (4)
Therefore, the following expression (5) is obtained from the expressions (1) and (2).
N = m (g−Aω 2 sinωt) (5)
Since N is greater than 0, equation (6) is obtained from equation (5).
sinωt <g / Aω 2 (6)
Since the absolute value of sinωt is 1 or less, equation (7) is obtained.
ω <(g / A) 1/2 (7)
Therefore, the angular velocity condition for the particles to jump over the network surface is expressed by equation (8).
ω ≧ (g / A) 1/2 (8)

粒子が網面を飛び上って再び網面に着地する際、網面が1周期分振動するまでに着地することが望ましい。このときの最大角速度は、（９）式で表される。
ω ≦（3.3・ｇ／A）１／２ （９）
つまり、角速度は、以下の（１０）式の範囲内で選択することが望ましいと考えられる。
（ｇ／A）１／２ ≦ ω ≦（3.3・ｇ／A）１／２ （１０）When the particles jump over the net surface and land on the net surface again, it is desirable that the net surface lands before it vibrates for one cycle. The maximum angular velocity at this time is expressed by equation (9).
ω ≤ (3.3 · g / A) 1/2 (9)
In other words, it is considered desirable to select the angular velocity within the range of the following equation (10).
(G / A) 1/2 ≦ ω ≦ (3.3 · g / A) 1/2 (10)

実施の形態１Embodiment 1

本発明に係る実施形態１を図面に基づいて説明する。

実施形態１に係る製鉄原料付着粉の除去装置は、図１に斜視図、図２に正面図を示す揺動反発式選別機（揺動篩）１を用いている。
Embodiment 1 which concerns on this invention is demonstrated based on drawing.

The apparatus for removing powder from an iron-making raw material according to Embodiment 1 uses a swinging repulsive sorter (swinging sieve) 1 shown in a perspective view in FIG. 1 and in a front view in FIG.


揺動反発式選別機は、投入物の形状および硬度の差によってスクリーン上で反発する弾道が異なることを利用して選別する形態選別装置である。揺動反発式選別機１は、一定角度傾斜させたスクリーンと偏心駆動機構とを有している。スクリーンは、傾斜スクリーン２とスクリーン架台３を有している。偏心駆動機構は、軸受４を介して一定量Ａだけ偏心したクランク軸５を有している。スクリーンを偏心駆動機構により傾斜逆方向に回転させて（図１中に矢印で示す）、傾斜方向に往復しながら上下方向に振動する動作（揺動運動）を行わせる。傾斜スクリーンの傾斜角度は、１０〜２５度が望ましい。傾斜角度を10度未満にすると、スクリーン上での移動速度が低いので、搬送物がスクリーン上に滞留し、処理速度が低下し易い。一方、傾斜角度を２５度超にすると、搬送物が傾斜シュートを滑り落ちるような挙動になって、十分に付着粉を篩えなくなり篩効率が低下する。
The swing repulsive sorter is a form sorter that sorts using the fact that the trajectory repels on the screen differs depending on the shape and hardness of the input material. The swing repulsive sorter 1 has a screen and an eccentric drive mechanism that are inclined at a certain angle. The screen has an inclined screen 2 and a screen mount 3. The eccentric drive mechanism has a crankshaft 5 that is eccentric by a certain amount A via a bearing 4. The screen is rotated in the direction opposite to the tilt by the eccentric drive mechanism (indicated by an arrow in FIG. 1), and an operation (oscillating motion) that vibrates in the vertical direction while reciprocating in the tilt direction is performed. The inclination angle of the inclined screen is desirably 10 to 25 degrees. When the tilt angle is less than 10 degrees, the moving speed on the screen is low, so that the conveyed product stays on the screen and the processing speed tends to decrease. On the other hand, if the inclination angle exceeds 25 degrees, the transported material behaves like sliding down the inclination chute, so that the adhering powder cannot be sufficiently sieved and the sieving efficiency is lowered.

揺動運動により、傾斜スクリーン２上で反発の強い重量物は傾斜スクリーン２の傾斜下方向に回収され、反発の弱い軽量物は傾斜スクリーン２の傾斜上方に回収され、傾斜スクリーン２の篩目より小さい小径物は傾斜スクリーン２の直下に回収される。 Due to the swinging motion, heavy objects that are strongly repelled on the inclined screen 2 are collected in the downward direction of the inclined screen 2, and light objects that are weakly repelled are collected above the inclined screen 2. Small small-diameter objects are collected directly under the inclined screen 2.

実施形態１に係る塊鉱石付着粉除去装置１においては、傾斜スクリーン２が偏心駆動機構（軸受４、クランク軸５）によって、上下方向の振動における片振幅が４０〜５０ｍｍ、傾斜逆方向に回転する円運動の回転数が１７０〜２１０ｒｐｍとなる揺動運動を行うようにするのが好ましい。   In the lump ore adhering powder removing apparatus 1 according to the first embodiment, the inclined screen 2 is rotated by the eccentric drive mechanism (bearing 4, crankshaft 5) in the vertical direction with a single amplitude of 40 to 50 mm in the vertical direction. It is preferable to perform a swinging motion in which the rotational speed of the circular motion is 170 to 210 rpm.

そして、傾斜スクリーン２は、打ち抜き板、櫛歯のいずれも使用可能で形状を問わず選択することができる。その材質は、鋼板製、樹脂製、ゴム製のいずれも使用可能であるが、硬質ゴム、軟質ゴムを樹脂布で強化したラバースクリーンが、耐摩耗性、耐衝撃性、粉の剥離性に優れるのでより好ましい。   The inclined screen 2 can be selected from any punched plate and comb teeth regardless of the shape. The material can be made of steel, resin, or rubber, but a rubber screen reinforced with a hard rubber or soft rubber with a resin cloth is excellent in wear resistance, impact resistance, and powder peelability. It is more preferable.

また、傾斜スクリーン２は、製鉄原料に付着した５ｍｍ以下の付着粉を効率的に除去できるように、５〜１５ｍｍの篩目を有するのが好ましい。製鉄原料に付着する粉のほとんどは５ｍｍ以下と細かいので、篩目は５ｍｍ以上であればよく、篩目は大きい方が目詰まり防止、処理能力の点で好ましいが、篩目が大きすぎると比較的小さい製鉄原料まで篩目を通ってしまうので、５〜１５ｍｍとするのが好ましく、５〜１０ｍｍがより好ましい。   Moreover, it is preferable that the inclination screen 2 has a sieve of 5-15 mm so that the adhering powder of 5 mm or less adhering to the iron-making raw material can be efficiently removed. Since most of the powder adhering to the iron-making material is as fine as 5 mm or less, the mesh size should be 5 mm or more. A larger mesh size is preferable in terms of prevention of clogging and processing ability, but compared with an excessively large mesh size. Since it passes through a sieve even to a small steelmaking raw material, it is preferably 5 to 15 mm, more preferably 5 to 10 mm.

なお、クランク軸５は、図１、図２では片側２基であるが、片側１基で駆動させても、また３基以上を、駆動軸同士をチェーンなどで連結させてもよい。   1 and 2, the crankshaft 5 is two on one side. However, the crankshaft 5 may be driven by one on one side, or three or more may be connected to each other by a chain or the like.

実施形態１に係る製鉄原料付着粉の除去装置１においては、図３に示すように、片振幅４０〜５０ｍｍ、回転数１７０〜２１０ｒｐｍで円運動（揺動運動）する傾斜スクリーン２上に製鉄原料１０を投入すると、クランク軸５の１回転の内、図３（ａ）に示すように、上半分の回転では、傾斜スクリーン２の動きによって製鉄原料１０が持ち上げられ、上方に跳ね上がる。このとき、製鉄原料１０同士の攪拌・衝突が生じ、製鉄原料１０表面に付着した微粉（付着粉）１１が剥ぎ取られる。更に、クランク軸５の１回転の内、図３（ｂ）に示すように、下半分の回転では、跳ね上げられた製鉄原料１０が傾斜スクリーン２上に落下し、製鉄原料１０と傾斜スクリーン２との衝突により、さらに付着粉１１が払い落とされる。そして、付着粉１１が除去された製鉄原料１０が傾斜スクリーン２の傾斜に沿って傾斜下方向に搬送されて行き、傾斜下方向端で回収される。一方、除去された付着粉１１は傾斜スクリーン２の直下に回収される。   As shown in FIG. 3, in the apparatus 1 for removing iron-made raw material adhering powder according to the first embodiment, the iron-making raw material is placed on an inclined screen 2 that makes a circular motion (oscillating motion) at a single amplitude of 40 to 50 mm and a rotational speed of 170 to 210 rpm. When 10 is put in, as shown in FIG. 3 (a) in one rotation of the crankshaft 5, the iron-making raw material 10 is lifted by the movement of the inclined screen 2 and jumps upward. At this time, stirring / collision between the iron-making raw materials 10 occurs, and the fine powder (attached powder) 11 attached to the surface of the iron-making raw material 10 is peeled off. Further, as shown in FIG. 3 (b) in one rotation of the crankshaft 5, the iron-making raw material 10 that has been bounced up falls on the inclined screen 2, and the iron-making raw material 10 and the inclined screen 2 are rotated. The adhering powder 11 is further removed by the collision. And the iron-making raw material 10 from which the adhering powder 11 has been removed is transported downward along the inclination of the inclined screen 2 and is collected at the end of the inclined lower direction. On the other hand, the removed adhering powder 11 is collected directly under the inclined screen 2.

このようにして、この実施形態においては、製鉄原料１０の表面に付着した付着粉１１を効率良く除去することができる。対象となる製鉄原料としては、鉄鉱石、焼結鉱、コークス、石炭が望ましい。   Thus, in this embodiment, the attached powder 11 attached to the surface of the iron-making raw material 10 can be efficiently removed. As the target steelmaking raw material, iron ore, sintered ore, coke, and coal are desirable.

本発明の実施例として、図４に示すように、表面に５ｍｍ以下の微粒鉄鉱石１１が１０質量％程度付着した１０〜５０ｍｍの銘柄Ａの塊鉱石１０Ａをベルトコンベア２０で搬送して、１０ｍｍの篩目を有する傾斜スクリーン（ラバースクリーン）２を備えた揺動篩１に投入し、傾斜スクリーン２の傾斜下方向端で塊鉱石１０Ｂを回収するとともに、傾斜スクリーン２の直下で付着粉１１を回収した。その際に、傾斜スクリーン２の片振幅は、３０ｍｍ、４５ｍｍ、６０ｍｍの３パターン、回転数は、１２０〜２５０ｒｐｍに設定した。     As an example of the present invention, as shown in FIG. 4, 10 to 50 mm brand A lump ore 10A having a fine iron ore 11 of 5 mm or less attached to the surface is conveyed by a belt conveyor 20 to 10 mm. The sludge screen 2 is put into a rocking sieve 1 equipped with an inclined screen (rubber screen) 2 and collects the ore 10B at the inclined lower end of the inclined screen 2, and the adhered powder 11 is directly under the inclined screen 2. It was collected. At that time, the half amplitude of the inclined screen 2 was set to 3 patterns of 30 mm, 45 mm, and 60 mm, and the rotation speed was set to 120 to 250 rpm.

そして、揺動篩１に投入する前の塊鉱石（除去処理前の塊鉱石）１０Ａと、回収した塊鉱石（除去処理後の塊鉱石）１０Ｂのそれぞれについて、乾燥後、篩目５ｍｍの篩を通過した篩下粉量を測定することで、除去処理後の塊鉱石１０Ｂの付着粉残留割合を算出した。ここで、付着粉残留割合は、除去処理前の塊鉱石１０Ａを乾燥して測定した篩下粉量（当初付着粉量）に対する、除去処理後の塊鉱石１０Ｂを乾燥して測定した篩下粉量（残留付着粉量）の質量比率（％）である。すなわち、付着粉残留割合＝塊鉱石１０Ｂの篩下粉量／塊鉱石１０Ａの篩下粉量×１００である。   And about each of the lump ore (the lump ore before the removal process) 10A before thrown into the rocking sieve 1 and the collected lump ore (the lump ore after the removal process) 10B, after drying, a sieve having a mesh size of 5 mm is used. By measuring the amount of sieving powder that passed through, the amount of residual powder remaining in the lump ore 10B after the removal treatment was calculated. Here, the adhering powder residual ratio is the sieving powder measured by drying the lump ore 10B after the removal treatment with respect to the sieving powder amount (initial adhering powder amount) measured by drying the lump ore 10A before the removal treatment. It is the mass ratio (%) of the amount (residual adhered powder amount). That is, the residual ratio of adhered powder = the amount of sieving powder of lump ore 10B / the amount of sieving powder of lump ore 10A × 100.

図５、図６に、この実施例における付着粉残留割合を示す。
図５より、各片振幅において、付着粉残留割合が最小となる回転数があることが分かる。そして、図６は、各片振幅での最小付着粉残留割合をプロットしたものである。5 and 6 show the residual ratio of adhered powder in this example.
From FIG. 5, it can be seen that at each piece amplitude, there is a rotation speed at which the adhering powder residual ratio is minimum. FIG. 6 is a plot of the minimum adhering powder residual ratio at each piece amplitude.

この図５、図６より、傾斜スクリーン２の揺動運動を片振幅４０〜５０ｍｍの領域に設定して、その回転数を１７０〜２１０ｒｐｍにすれば、付着粉残留割合を非常に少なくすることができ、好ましい。   From FIG. 5 and FIG. 6, if the swinging motion of the inclined screen 2 is set to a region with a single amplitude of 40 to 50 mm and the rotation speed is set to 170 to 210 rpm, the residual ratio of adhered powder can be greatly reduced. It is possible and preferable.

本発明の実施例２を示す。付着粉除去の方法は、実施例１と同様であるが、塊鉱石は別の銘柄B（第一の実施例は銘柄A）を使用した。供給する塊鉱石銘柄Bは、５ｍｍ以下の微粒が１０％程度付着したものを使用した。
スクリーンの片振幅は、３０、４５、６０mmの３パターン、回転数は、１２０〜２５０ｒｐｍと設定した。Example 2 of the present invention will be described. The method for removing the adhered powder was the same as in Example 1, but another brand B (brand A in the first example) was used as the lump ore. The lump ore brand B to be supplied was one having about 10% of fine particles of 5 mm or less adhered thereto.
The half amplitude of the screen was set to 3 patterns of 30, 45, and 60 mm, and the rotation speed was set to 120 to 250 rpm.

図７、８に実施例での付着粉残留割合を示す。
図７より、実施例１同様、各片振幅において、付着粉残留割合が最小をとる回転数領域があることが分かる。また、各片振幅での最小付着粉残留割合をプロットしたものが図８である。図８より、実施例１同様、片振幅を４０〜５０mmの領域に設定すれば、付着粉残留割合を最小にすることができることがいえる。 7 and 8 show the residual ratio of adhered powder in the examples.
From FIG. 7, it can be seen that, as in Example 1, there is a rotation speed region in which the residual ratio of the adhered powder is minimized in each piece amplitude. FIG. 8 is a plot of the minimum adhering powder residual ratio at each piece amplitude. From FIG. 8, it can be said that, as in Example 1, if the half amplitude is set in the region of 40 to 50 mm, the residual ratio of adhered powder can be minimized.

実施の形態２Embodiment 2

図９に揺動篩の斜視図、図１０に正面図を示す。
一定角度傾斜させたスクリーン２が、上下方向のみ往復運動するように拘束されており（図示せず）、４隅にカムフォロア７を左右方向に往復させるスリットが入った部材８が取り付けられている。また、カムフォロア７を介して一定量Ｂだけ偏心したクランク軸５が取り付けられている。クランク軸５を回転させることで、スクリーン２を上下方向に振動する動作を行い、投入物を跳ね上げ、再びスクリーン２上に落下衝突させることを繰り返す装置である。 FIG. 9 is a perspective view of the swing sieve, and FIG. 10 is a front view.
The screen 2 inclined at a certain angle is restrained so as to reciprocate only in the vertical direction (not shown), and members 8 having slits for reciprocating the cam follower 7 in the left-right direction are attached to the four corners. A crankshaft 5 that is eccentric by a certain amount B is attached via a cam follower 7. By rotating the crankshaft 5 , the screen 2 is oscillated in the vertical direction, the throwing-up of the input material, and repeated dropping and colliding with the screen 2 are repeated.

この装置に塊鉱石を投入すると、図１１のように、クランク軸５の１回転の内、最下点から最高点までの回転で、スクリーン２の動きによって塊鉱石が持ち上げられ、スクリーン２の傾斜上方に跳ね上がる。このとき、塊鉱石同士の攪拌・衝突が生じ、鉱石表面に付着した粉が剥ぎ取られる。更に、クランク軸５の最高点から最下点までの回転では、跳ね上げられた塊鉱石がスクリーン６上に落下し、塊鉱石とスクリーン２との衝突により、さらに付着粉が払い落とされる。これを繰り返して塊鉱石が傾斜下方向に搬送されていく。 When lump ore is put into this device, lump ore is lifted by the movement of the screen 2 by rotation from the lowest point to the highest point in one rotation of the crankshaft 5 as shown in FIG. Jump up. At this time, agitation and collision between the massive ores occur, and the powder adhering to the ore surface is peeled off. Further, when the crankshaft 5 is rotated from the highest point to the lowest point, the lump ore that has been bounced down falls on the screen 6, and the adhering powder is further wiped off by the collision between the lump ore and the screen 2. By repeating this, the lump ore is transported downward in the slope.

クランク軸５は、図９、１０では片側２基であるが、片側１基で駆動させても、また３基以上を駆動軸同士をチェーンなどで連結させてもよい。
スクリーン６の形状、篩目は、第一の実施形態と同様のものが選択できる。 The crankshaft 5 is two on one side in FIGS. 9 and 10, but may be driven by one on one side, or three or more may be connected to each other by a chain or the like.
The shape and screen of the screen 6 can be the same as those in the first embodiment.

１ 製鉄原料着粉除去装置（揺動反発式選別機、揺動篩）
２ 傾斜スクリーン
３ スクリーン架台
４ 軸受
５ クランク軸
７ カムフォロア
８ カムフォロア７を左右方向に往復させるスリットが入った部材
１０ 製鉄原料
１０Ａ 除去処理前の製鉄原料
１０Ｂ 除去処理後の製鉄原料
１１ 付着粉
２０ ベルトコンベア1 Steelmaking raw material powder removal device (oscillating repulsive sorter, oscillating sieve)
DESCRIPTION OF SYMBOLS 2 Inclined screen 3 Screen mount 4 Bearing 5 Crankshaft 7 Cam follower 8 The member containing the slit which reciprocates the cam follower 7 in the left-right direction 10 Iron-making raw material 10A Iron-making raw material 10B before removal processing Iron-making raw material 11 after removal processing 11 Adhering powder 20 Belt conveyor

Claims (7)

製鉄原料の表面に付着した付着粉を除去する装置であって、片振幅４０〜５０ｍｍ、回転数１７０〜２１０ｒｐｍの偏心駆動機構により、傾斜逆回転方向に揺動運動する傾斜スクリーンを有し、該傾斜スクリーンが片振幅Ａ、角速度ωで振動し、角速度ωが（ｇ／Ａ）１／２以上、（３．３ｇ／Ａ）１／２以下である製鉄原料付着粉の除去装置。 An apparatus that removes adhering powder adhering to the surface of a steelmaking raw material, having an inclined screen that oscillates in an inclined reverse rotation direction by an eccentric drive mechanism having a single amplitude of 40 to 50 mm and a rotation speed of 170 to 210 rpm , An apparatus for removing iron-made raw material adhering powder in which an inclined screen vibrates at a single amplitude A and an angular velocity ω, and the angular velocity ω is (g / A) 1/2 or more and (3.3 g / A) 1/2 or less. 製鉄原料の表面に付着した付着粉を除去する装置であって、片振幅４０〜５０ｍｍ、回転数１７０〜２１０ｒｐｍの偏心駆動機構により、上下方向に往復運動する傾斜スクリーンを有し、該傾斜スクリーンが片振幅Ａ、角速度ωで振動し、角速度ωが（ｇ／Ａ）１／２以上、（３．３ｇ／Ａ）１／２以下である製鉄原料付着粉の除去装置。 An apparatus that removes adhering powder adhering to the surface of a steelmaking raw material, and has an inclined screen that reciprocates up and down by an eccentric drive mechanism having a single amplitude of 40 to 50 mm and a rotational speed of 170 to 210 rpm. An apparatus for removing powders adhering to a steelmaking raw material that vibrates at a single amplitude A and an angular velocity ω, and the angular velocity ω is (g / A) 1/2 or more and (3.3 g / A) 1/2 or less. 前記傾斜スクリーンが、１０〜２５度の傾斜角度を有する請求項１または２に記載の製鉄原料付着粉の除去装置。 The apparatus for removing powder from an iron-making raw material according to claim 1 or 2 , wherein the inclined screen has an inclination angle of 10 to 25 degrees. 片振幅４０〜５０ｍｍ、回転数１７０〜２１０ｒｐｍの偏心駆動機構により、傾斜逆回転方向に揺動運動して、片振幅Ａ、角速度ωで振動し、角速度ωが（ｇ／Ａ）１／２以上、（３．３ｇ／Ａ）１／２以下である傾斜スクリーンを有する製鉄原料石付着粉の除去装置を用いて、製鉄原料の表面に付着した付着粉を除去する製鉄原料付着粉の除去方法。 By an eccentric drive mechanism with a single amplitude of 40 to 50 mm and a rotation speed of 170 to 210 rpm, the rocking motion is performed in the reverse direction of the tilt, and the single amplitude A and the angular velocity ω are oscillated, and the angular velocity ω is (g / A) 1/2 or more. (3.3 g / A) A method for removing iron-making raw material adhering powder, which uses an apparatus for removing iron-making raw material stone adhering powder having an inclined screen of 1/2 or less, to remove the adhering powder adhering to the surface of the iron-making raw material. 片振幅４０〜５０ｍｍ、回転数１７０〜２１０ｒｐｍの偏心駆動機構により、上下方向に往復運動して、片振幅Ａ、角速度ωで振動し、角速度ωが（ｇ／Ａ）１／２以上、（３．３ｇ／Ａ）１／２以下である傾斜スクリーンを有する製鉄原料石付着粉の除去装置を用いて、製鉄原料の表面に付着した付着粉を除去する製鉄原料付着粉の除去方法。 By an eccentric drive mechanism having a single amplitude of 40 to 50 mm and a rotational speed of 170 to 210 rpm, the reciprocating motion is made up and down to vibrate at a single amplitude A and an angular velocity ω, and the angular velocity ω is (g / A) 1/2 or more, (3 .3 g / A) A method for removing iron-making raw material-attached powder, which uses an apparatus for removing iron-making raw material stone-attached powder having an inclined screen that is ½ or less to remove the attached powder that has adhered to the surface of the iron-making raw material. 前記傾斜スクリーンの運動により塊鉱石を跳ね上げて、跳ね上げた塊鉱石を、前記傾斜スクリーンおよび／または前記傾斜スクリーン上の塊鉱石に落下衝突させて、塊鉱石表面に付着した粉を塊鉱石表面から剥がし、該剥がした粉を前記傾斜スクリーンを通過させて塊鉱石と分離することを特徴とする請求項４または５に記載の製鉄原料付着粉の除去方法。 The lump ore is bounced up by the movement of the inclined screen, the lump ore that is bounced up is dropped and collided with the lump screen and / or the lump ore on the inclined screen, and the powder adhering to the lump ore surface 6. The method for removing iron-made raw material-attached powder according to claim 4 or 5 , wherein the peeled powder is separated from the lump ore by passing through the inclined screen. 前記製鉄原料が、鉄鉱石、焼結鉱、コークスと石炭である請求項４〜６のいずれかに記載の製鉄原料付着粉の除去方法。 The said iron-making raw material is an iron ore, a sintered ore, coke, and coal, The removal method of the iron-making raw material adhesion powder in any one of Claims 4-6 .
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