JP2019112154A - Limestone raw material feeding chute - Google Patents

Limestone raw material feeding chute Download PDF

Info

Publication number
JP2019112154A
JP2019112154A JP2017244989A JP2017244989A JP2019112154A JP 2019112154 A JP2019112154 A JP 2019112154A JP 2017244989 A JP2017244989 A JP 2017244989A JP 2017244989 A JP2017244989 A JP 2017244989A JP 2019112154 A JP2019112154 A JP 2019112154A
Authority
JP
Japan
Prior art keywords
chute
raw material
limestone
limestone raw
compressed air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2017244989A
Other languages
Japanese (ja)
Other versions
JP7069696B2 (en
Inventor
拓二 佐々木
Takuji Sasaki
拓二 佐々木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Metal Mining Co Ltd
Original Assignee
Sumitomo Metal Mining Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Mining Co Ltd filed Critical Sumitomo Metal Mining Co Ltd
Priority to JP2017244989A priority Critical patent/JP7069696B2/en
Publication of JP2019112154A publication Critical patent/JP2019112154A/en
Application granted granted Critical
Publication of JP7069696B2 publication Critical patent/JP7069696B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Chutes (AREA)
  • Crushing And Grinding (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Furnace Charging Or Discharging (AREA)

Abstract

To provide a chute capable of preventing limestone raw material from being clogged even when treating the limestone raw material having a high water content rate.SOLUTION: There is provided a chute 2 comprising a tilted bottom face 10 onto which limestone raw material charged in a crusher constituting a limestone slurry preparation facility in a nickel HPAL smelting plant is preferably supplied, and side faces 11 and 12 at both end parts in a width direction thereof. It is preferred that a plurality of air discharge parts 14 each for discharging compressed air preferably having a pressure of 0.7 MPa or more toward a downstream side in a slide-down direction A of the limestone raw material slid down along the bottom face 10 are arranged at both the end parts in the width direction of the bottom face 10, and a direction toward the downstream side in the slide-down direction A is tilted by 25 to 45° relative to the slide-down direction A.SELECTED DRAWING: Figure 2

Description

本発明は、石灰石スラリー調製に使用する石灰石原料の供給用シュート、及びシュート上の石灰石原料の堆積防止方法に関する。   The present invention relates to a chute for supplying limestone raw material used for limestone slurry preparation, and a method for preventing deposition of the limestone raw material on the chute.

高圧酸浸出（Ｈｉｇｈ Ｐｒｅｓｓｕｒｅ Ａｃｉｄ Ｌｅａｃｈｉｎｇ、以後ＨＰＡＬと称する）法を用いたニッケル製錬プラントでは、スラリー化した低品位ニッケル鉱石に高圧下で硫酸を添加することによりニッケルやコバルトなどの有価金属を浸出する処理が行われている。この浸出処理で得られた浸出液には鉄等の不純物が含まれているため、第１の中和工程にて浸出液のｐＨ調整が行われた後、固液分離により不純物を除去している。不純物除去後は、浸出液にＨ２Ｓガスを吹き込むことで有価金属としてのニッケル及びコバルトを硫化物として回収している。有価金属の回収後の残液は、第２の中和工程でｐＨ調整が行われた後、テーリングダムへ送液される。 In a nickel smelting plant using high pressure acid leaching (hereinafter referred to as HPAL) method, valuable metals such as nickel and cobalt are leached by adding sulfuric acid under high pressure to slurry low grade nickel ore Processing has been done. Since the leachate obtained by this leaching treatment contains impurities such as iron, after the pH adjustment of the leachate is performed in the first neutralization step, the impurities are removed by solid-liquid separation. After removing the impurities, nickel and cobalt as valuable metals are recovered as sulfides by blowing H 2 S gas into the leaching solution. The residual liquid after recovery of valuable metals is sent to a tailing dam after pH adjustment is performed in the second neutralization step.

上記のＨＰＡＬ製錬プラントでは、各中和工程のプロセス液のｐＨ調整のために石灰石が使用されている。この石灰石は、反応効率や搬送の容易さなどの観点から細かく粉砕された石灰石原料と水とからなる石灰石スラリーの形態で該プロセス液に添加されている。この石灰石スラリーの調製には、石灰石原料を保管場所から搬送するコンベアと、該コンベアの先端部から落下した石灰石原料を受け入れて所定の位置にガイドするシュートと、該シュートから投入された石灰石原料を破砕する破砕機と、該破砕された石灰石原料を所定のスラリー濃度となるように添加された水と共に石灰石スラリーの形態で貯蔵する貯蔵タンクと、該貯蔵タンクから抜き出された石灰石スラリーを移送のため昇圧する送液ポンプとから主に構成される設備が一般的に用いられている。   In the above HPAL smelting plant, limestone is used to adjust the pH of the process liquid of each neutralization step. The limestone is added to the process liquid in the form of a limestone slurry consisting of a finely crushed limestone raw material and water from the viewpoint of reaction efficiency and ease of transportation. For preparation of the limestone slurry, a conveyor for transporting the limestone material from the storage location, a chute for receiving the limestone material dropped from the tip of the conveyor and guiding it to a predetermined position, and the limestone material introduced from the chute A crusher for crushing, a storage tank for storing the crushed limestone raw material in the form of a limestone slurry together with water added to a predetermined slurry concentration, and transferring the limestone slurry extracted from the storage tank For this reason, equipment mainly composed of a liquid feed pump for increasing pressure is generally used.

上記の石灰石原料を破砕機に向けてガイドするシュートは、傾斜した底面に沿って石灰石原料を滑落させながらガイドするものであるため、雨季などで石灰石原料が湿った状態になると、粒径の特に細かな石灰石原料が該底面に付着して塊を形成し、そこを起点として石灰石原料が堆積してシュート内で詰まりが生じることがあった。堆積した石灰石原料の塊は、ある程度大きくなって滑落方向の力がシュートの底面との摩擦抵抗を超えると、大きな塊のまま破砕機内に落下し、その結果、破砕機に瞬時に過負荷がかかってモーターがトリップし、設備停止するトラブルが頻発することがあった。   The chute guiding the above limestone raw material to the crusher guides the limestone raw material while sliding down along the inclined bottom, so when the limestone raw material becomes wet in the rainy season etc., the particle size is A fine limestone raw material adhered to the bottom to form a lump, and from there, the limestone raw material could be deposited to cause clogging in the chute. When the lump of limestone raw material that has accumulated becomes large to some extent and the sliding direction force exceeds the frictional resistance with the bottom of the chute, the large lump as it is will fall into the crusher, resulting in an instantaneous overload of the crusher The motor tripped, causing frequent troubles to stop the equipment.

上記のようなシュート内での石灰石原料の詰り防止のため、様々な技術が提案されている。例えば特許文献１には、密閉構造のシュートの内部から外部に乾燥空気を流す技術が提案されている。この方法により、湿気を帯びた外部空気がシュート内部に流れ込むことを防止できるとともに、シュート内部の湿気を帯びた石灰石を乾燥させることができるので、石灰石がシュート内部に付着するのを防止できると記載されている。   Various techniques have been proposed to prevent clogging of the limestone raw material in the above-mentioned chute. For example, Patent Document 1 proposes a technique of flowing dry air from the inside to the outside of a chute having a closed structure. According to this method, it is possible to prevent moist external air from flowing into the inside of the chute and to dry the moist limestone inside the chute, thereby preventing limestone from adhering to the inside of the chute. It is done.

また、特許文献２にはロータリーキルンに粉体原料を投入するための固定式シュートにおいて、その粉体原料受入側に該シュートから独立した鋼板製のライナーを内挿し、該ライナーに市販のバイブレーターを取り付けて連続的に振動させるとともに、該ライナーに一般的な昇降装置を連結して昇降させることによって、粉体がシュート内部に付着するのを防止する技術が提案されている。   In addition, in Patent Document 2, in a fixed type chute for charging a powder material into a rotary kiln, a steel plate liner independent of the chute is inserted on the powder material receiving side, and a commercially available vibrator is attached to the liner. There has been proposed a technique for preventing the powder from adhering to the inside of the chute by continuously vibrating it and connecting a general lifting device to the liner and moving it up and down.

特開２００８−２９００４５号公報JP, 2008-290045, A 特開平１０−３１１６８２号公報JP 10-311682 A

しかしながら、特許文献１の技術を用いて石灰石原料をシュート内部で乾燥させるためには、大量の乾燥空気を供給するための設備が必要になるため、コスト面から実用的ではなかった。また、特許文献２の技術は粉体付着防止のためにライナーの振動装置及び昇降装置が必要になるため設備が全体的に大型化し、既設の石灰石スラリー調製設備に導入する場合は大掛かりな改造工事が必要になるため、この場合もコスト面から実用的ではなかった。   However, in order to dry a limestone raw material inside a chute using the technique of Patent Document 1, equipment for supplying a large amount of dry air is required, which is not practical in terms of cost. In addition, the technology of Patent Document 2 requires a vibration device and a lifting device of the liner to prevent powder adhesion, so that the entire equipment becomes large in size, and a large-scale remodeling work when introduced into existing limestone slurry preparation equipment Again, this is not practical in terms of cost.

他方、シュート内での石灰石原料の堆積を抑えるため、シュートの傾斜角を大きくすることが考えられるが、シュートの傾斜角を変えるには既設の破砕機やベルトコンベアの位置も変える必要があり、その改造工事にかかるコストが莫大になる可能性がある。更に、シュートの傾斜角が変わると破砕機への石灰石原料の供給量が変わる可能性があり、かえって頻繁に設備停止を引き起こすリスクもある。   On the other hand, it is conceivable to increase the inclination angle of the chute in order to suppress the deposition of the limestone material in the chute, but to change the inclination angle of the chute, it is necessary to change the position of the existing crusher and belt conveyor, The cost of the remodeling work may be enormous. Furthermore, if the inclination angle of the chute changes, the supply amount of limestone raw material to the crusher may change, and there is also a risk of causing frequent equipment shutdown.

本発明は、上記したような実情に鑑みて提案されたものであり、石灰石スラリー調製設備において、含水率の高い石灰石原料を取り扱う場合であっても、シュート内において石灰石原料が詰まりにくく、よって供給先の破砕機において過負荷による停止が生じにくく、設備の稼働率を向上させることが可能なシュートを提供することを目的としている。   The present invention has been proposed in view of the situation as described above, and the limestone raw material is less likely to be clogged in the chute even when handling limestone raw material having a high moisture content in a limestone slurry preparation facility, and thus supplied. It is an object of the present invention to provide a chute which is less likely to be stopped due to overload in the above-mentioned crusher and can improve the operation rate of the facility.

本発明者は、上記のシュート内の石灰石原料の詰りの問題を解決するため鋭意研究を重ねた結果、シュートの底面の幅方向両端部に圧縮エアーを放出する放出部を複数個設置することで、堆積した石灰石原料を瞬時に吹き飛ばして破砕機への定量供給を維持できることを見出し、本発明を完成するに至った。   As a result of intensive studies to solve the problem of clogging of limestone raw material in the above-mentioned chute, the present inventor installs a plurality of discharge parts for discharging compressed air at both ends in the width direction of the bottom of the chute. It has been found that the deposited limestone raw material can be blown off instantaneously to maintain the fixed supply to the crusher, and the present invention has been completed.

すなわち、本発明に係るシュートは、石灰石原料を供給する傾斜した底面とその幅方向両端部に位置する側面とを有するシュートであって、前記底面の幅方向両端部に、該底面に沿って滑落する石灰石原料の滑落方向の下流側に向って圧縮エアーを放出する複数のエアー放出部が配置されていることを特徴とする。   That is, the chute according to the present invention is a chute having an inclined bottom surface for supplying limestone raw material and side surfaces located at both widthwise end portions thereof, and is slid along the bottom surface at both widthwise end portions of the bottom surface. A plurality of air discharge parts that discharge compressed air toward the downstream side of the sliding direction of the limestone raw material are disposed.

また、本発明に係る石灰石原料の堆積防止方法は、石灰石原料を供給する傾斜した底面とその幅方向両端部に位置する側面とを有するシュートの該両端部に、該底面に沿って滑落する石灰石原料の滑落方向の下流側に向って圧縮エアーを放出することを特徴としている。   In the limestone material deposition preventing method according to the present invention, the limestone sliding along the bottom surface of the chute having sloped bottom surfaces supplying limestone material and side surfaces positioned at both widthwise end portions thereof. It is characterized in that compressed air is discharged toward the downstream side of the sliding direction of the raw material.

本発明によれば、含水率の高い石灰石原料を取り扱う場合であっても、シュート内で該石灰石原料が詰まるのを防止することができる。   According to the present invention, even when handling a limestone material having a high moisture content, clogging of the limestone material in the chute can be prevented.

本発明のシュートが好適に適用される石灰石スラリー調製設備の模式的な側面図である。It is a typical side view of a limestone slurry preparation installation where a chute of the present invention is applied suitably. 本発明の実施形態のシュートの斜視図である。It is a perspective view of the chute of an embodiment of the present invention. 図２のシュートをその底面に垂直な方向から見た断面図である。It is sectional drawing which looked at the chute | shoot of FIG. 2 from the direction perpendicular | vertical to the bottom face. 図２のシュートの側面図である。It is a side view of the chute of FIG.

以下、本発明のシュートの実施形態について、図面を参照しながら詳細に説明する。この本発明の実施形態のシュートは、ニッケルＨＰＡＬ製錬プラントの石灰石スラリー調製設備を構成する破砕機に石灰石原料を供給するために使用されるものである。すなわち、図１に示すように、ベルトコンベア１によってストックヤードから運ばれてきた石灰石原料Ｒは、その先端部から落下すると下方に設けられているシュート２の上端開口部から受け入れられる。該上端開口部から受け入れられた石灰石原料Ｒは、該シュート２の傾斜する底面に沿ってガイドされた後、シュート２の下端開口部から排出され、その下方に位置する破砕機３へ投入される。   Hereinafter, embodiments of the chute of the present invention will be described in detail with reference to the drawings. The chute of this embodiment of the present invention is used to supply a limestone raw material to a crusher which constitutes a limestone slurry preparation facility of a nickel HPAL smelting plant. That is, as shown in FIG. 1, the limestone raw material R conveyed from the stock yard by the belt conveyor 1 is received from the upper end opening of the chute 2 provided below when it falls from its tip. Limestone raw material R received from the upper end opening is guided along the inclined bottom surface of the chute 2 and then discharged from the lower end opening of the chute 2 and input to the crusher 3 located therebelow .

このように、石灰石原料をガイドする役割を担う本発明の実施形態のシュート２は、例えば図２に示すように、細長の略逆台形形状を有する傾斜した底面１０と、この底面１０の幅方向両端部に位置する略矩形形状の１対の側面１１、１２と、該底面１０に対向するようにこれら１対の側面１１、１２の上縁部に架け渡された細長の略逆台形形状の蓋部１３とからなり、上端開口部及び下端開口部がそれぞれ石灰石原料の投入口及び排出口となる。   Thus, the chute 2 according to the embodiment of the present invention, which plays a role of guiding limestone raw material, has an inclined bottom surface 10 having an elongated substantially inverted trapezoidal shape and a width direction of the bottom surface 10 as shown in FIG. A pair of substantially rectangular shaped side surfaces 11 and 12 located at both ends, and a slender substantially inverted trapezoidal shape bridging the upper edges of the pair of side surfaces 11 and 12 so as to face the bottom surface 10 It consists of the cover part 13, and an upper end opening part and a lower end opening part become an inlet and outlet of a limestone raw material, respectively.

本発明の実施形態のシュート２は、この底面１０の幅方向両端部に、該底面１０に沿って滑落する石灰石原料の滑落方向Ａの下流側に向って圧縮空気を放出する複数のエアー放出部１４が配されている。このように複数のエアー放出部１４から圧縮エアーを吹き出すことにより、底面１０と側面１１、１２との隅部に特に堆積する傾向にある石灰石原料を吹き飛ばすことができ、よって石灰石原料の定量供給を継続することが可能になる。   The chute 2 according to the embodiment of the present invention has a plurality of air discharge parts that discharge compressed air to the downstream side of the sliding direction A of the limestone material sliding down along the bottom surface 10 at both widthwise end portions of the bottom surface 10 There are fourteen. By blowing compressed air from the plurality of air discharge parts 14 in this manner, it is possible to blow away the limestone raw material which tends to deposit particularly on the corners of the bottom face 10 and the side faces 11 and 12, thereby supplying a fixed amount of limestone raw material. It is possible to continue.

上記のように、複数のエアー放出部１４をシュート２の幅方向両端部に配置する理由は、シュート２の底面のみならずシュート２の側面１１、１２においても石灰石原料が付着するので、これら底面１０と側面１１、１２とが直交する隅部でより多量に石灰石原料が堆積するからである。上記の複数のエアー放出部１４は、シュート２の底面１０の幅方向両端部から石灰石原料の堆積が生じやすい部位に向けて圧縮エアーが吹き付けられるのであれば設置位置については特に限定はないが、図３に示すように、底面１０の幅方向両端部に同数のエアー放出部１４（図３では３個ずつ）を滑落方向Ａに均等な間隔をあけて配置するのが好ましい。なお、図３では滑落方向Ａに平行な底面１０の中心線に関して左右対称に配置されているが、これに代えて左右で互い違いとなるように千鳥足状に配置してもよい。   As described above, the reason for arranging the plurality of air discharge parts 14 at both widthwise end portions of the chute 2 is that limestone raw material adheres not only to the bottom surface of the chute 2 but also to the side surfaces 11 and 12 of the chute 2 This is because a large amount of limestone material is deposited at the corner where 10 and the side surfaces 11 and 12 intersect with each other. The position of the plurality of air discharge parts 14 is not particularly limited as long as compressed air is sprayed from the both widthwise end portions of the bottom surface 10 of the chute 2 toward a portion where deposition of the limestone raw material tends to occur. As shown in FIG. 3, it is preferable to arrange the same number of air discharge parts 14 (three pieces in FIG. 3) at both ends in the width direction of the bottom face 10 at equal intervals in the sliding direction A. Although in FIG. 3, they are arranged symmetrically with respect to the center line of the bottom surface 10 parallel to the sliding direction A, they may be alternately arranged in a staggered manner so as to alternate between the left and right.

上記の各エアー放出部１４が滑落方向Ａの下流側に向う方向としては、具体的には図３に示すように滑落方向Ａに対して２５〜４５°傾斜させるのが好ましい。この傾斜角度θが４５°を超えると、石灰石原料の滑落方向Ａに対してより直角に近い角度で圧縮エアーを吹き付けることになるため、石灰石原料による詰りを効果的に防止することができなくなるおそれがある。逆に、上記の傾斜角度が２５°未満の場合は、底面１０の幅方向両側部に位置する隅部の詰りは効果的に防止することができるものの、シュート２の幅方向中央部分に堆積した石灰石原料を吹き飛ばしにくくなり、ここを起点として詰りが発生するおそれがある。   Specifically, as shown in FIG. 3, it is preferable to incline the air discharging portion 14 downstream with respect to the sliding direction A at an angle of 25 to 45 ° with respect to the sliding direction A. If this inclination angle θ exceeds 45 °, compressed air is blown at an angle closer to a right angle with respect to the sliding direction A of the limestone raw material, so that clogging by the limestone raw material may not be effectively prevented. There is. On the contrary, when the above-mentioned inclination angle is less than 25 °, although clogging at the corners located on both sides in the width direction of the bottom surface 10 can be effectively prevented, it was accumulated in the center of the chute 2 in the width direction It becomes difficult to blow away limestone raw material, and there is a possibility that clogging may occur from here.

図２〜３に示す具体例では、シュート２に６個のエアー放出部１４が設置されているが、これに限定されるものではなく、エアー放出部１４の個数はこれより多くてもよいし少なくてもよい。但し、シュート２の底面１０の面積２.６ｍ２当たりエアー放出部１４を６個以上配置することが好ましい。これにより、より確実に石灰石原料の詰りを防止することができる。エアー放出部１４の個数の上限についてはコスト面と底面１０の面積を広く確保する観点からできるだけ少ない方が好ましい。 In the specific example shown in FIGS. 2 to 3, six air discharge parts 14 are installed in the chute 2, but the invention is not limited to this, and the number of air discharge parts 14 may be larger than this. It may be less. However, it is preferable to arrange six or more air discharge parts 14 per 2.6 m 2 of the area of the bottom surface 10 of the chute 2. Thereby, clogging of the limestone raw material can be prevented more reliably. The upper limit of the number of the air discharger 14 is preferably as small as possible from the viewpoint of securing a wide area of the cost and the bottom surface 10.

各エアー放出部１４の具体的な構造としては、図２〜４に示すように、先端開口部が上記の滑落方向Ａの下流側を臨むように配置された呼び径１／４〜１インチ程度の配管で構成することができるが、これに限定されるものではなく、例えば底面１０の幅方向両端部に沿ってそれぞれ２本の配管を設け、これら配管に一定の間隔をあけて該滑落方向Ａの下流側を臨む方向に開口する開口部を穿孔してもよいし、これら配管に一定の間隔をあけて該滑落方向Ａの下流側に圧縮エアーが吹き出されるように市販のエアーノズルを取り付けてもよい。   As a specific structure of each air release portion 14, as shown in FIGS. 2 to 4, the tip opening portion is disposed so as to face the downstream side of the above sliding direction A, and the nominal diameter is about 1/4 to 1 inch. However, the present invention is not limited thereto. For example, two pipes may be provided along both widthwise end portions of the bottom surface 10, and the pipes may be separated by a predetermined distance from each other. Alternatively, a commercially available air nozzle may be provided so that compressed air is blown out downstream of the sliding direction A at predetermined intervals in these pipings. You may attach it.

上記の複数のエアー放出部１４の各々の上流側には、電磁弁などの開閉手段を設け、これらを例えば一定の時間ごとに開閉させることで圧縮エアーを間欠的にシュート２内に吹き込むように制御するのが好ましい。圧縮エアーの間欠的な吹き込みのタイミングについては特に限定はなく、例えば全てのエアー放出部１４から圧縮エアーが同時に放出するようにしてもよいし、所定の順序で１個ずつ又は数個ずつ放出するようにしてもよい。上記の間欠的な吹き込みの制御では、単位時間当たりの吹き込みの頻度や各吹き込み時の放出時間が容易に変更できるのが好ましい。また、各エアー放出部１４の上流側にはグローブ弁等の流量調整弁が設けられているのが好ましい。これにより、石灰石原料の含水率や粒径などの性状が変動しても上記吹き込み時の圧縮エアーの供給量や放出時間を適宜変更することができるので、局所的な石灰石原料の堆積をより効率よく防止することができる。   An opening / closing means such as a solenoid valve is provided on the upstream side of each of the plurality of air discharge parts 14 described above, and for example, compressed air is intermittently blown into the chute 2 by opening and closing these at predetermined time intervals. It is preferable to control. There is no particular limitation on the timing of intermittent blowing of compressed air, and for example, compressed air may be released simultaneously from all the air release parts 14, or may be released one by one or several at a predetermined order. You may do so. In the above-mentioned control of intermittent blowing, it is preferable that the frequency of blowing per unit time and the release time at each blowing can be easily changed. Further, it is preferable that a flow control valve such as a globe valve is provided on the upstream side of each air discharge part 14. As a result, even if the moisture content and particle size of the limestone raw material fluctuate, the amount and time of compressed air supplied at the time of blowing can be changed appropriately, so that the deposition of the limestone raw material can be made more efficient locally. It can be well prevented.

各エアー放出部１４に供給する圧縮エアーの圧力はゲージ圧基準で０.７ＭＰａ以上が好ましい。この圧縮エアーの圧力が０.７ＭＰａ未満では、エアー放出部１４から放出されるエアーの風力が弱くなり過ぎ、石灰石原料の詰りを効果的に防止するのが困難になる。上記のように各エアー放出部１４から間欠的に放出される圧縮エアーの１回当たりの放出時間は、１秒以上３秒以下であるのが好ましい。この放出時間が１秒未満では、圧縮エアーを放出する効果がほとんど得られなくなる。逆に、放出時間が３秒を超えると、間欠的に放出することによる効果が得られにくくなる。次に、本発明のシュートの具体的な実施例について説明するが、本発明は以下の実施例に限定されるものではない。   The pressure of the compressed air supplied to each air discharge part 14 is preferably 0.7 MPa or more on the basis of gauge pressure. If the pressure of the compressed air is less than 0.7 MPa, the wind force of the air released from the air release portion 14 becomes too weak, and it becomes difficult to effectively prevent clogging of the limestone raw material. As described above, it is preferable that the discharge time per one compressed air discharged intermittently from each air release part 14 is 1 second or more and 3 seconds or less. If this release time is less than 1 second, the effect of releasing compressed air can hardly be obtained. On the contrary, if the release time exceeds 3 seconds, it is difficult to obtain the effect of the intermittent release. Next, specific examples of the chute of the present invention will be described, but the present invention is not limited to the following examples.

図１に示すようなベルトコンベア１、シュート２、及び破砕機３からなる設備を用いて粒径１００ｍｍ以下の石灰石原料を８０〜１４０ｔ／Ｈｒでベルトコンベア１に供給しながら破砕した。このシュート２は底面１０の面積が２.６ｍ２であり、その幅方向両端部に図３に示すように合計６個の呼び径３／４インチの配管からなるエアー放出部１４を取り付け、各々、先端開口部が滑落方向Ａに対して４５°傾斜した方向を臨むように調整した。 A limestone raw material having a particle size of 100 mm or less was crushed while being supplied to the belt conveyor 1 at 80 to 140 t / Hr using equipment including the belt conveyor 1, the chute 2, and the crusher 3 as shown in FIG. This chute 2 has an area of the bottom surface 10 of 2.6 m 2 , and as shown in FIG. 3, air discharge parts 14 consisting of a total of six 3/4 inch diameter pipes are attached to both ends in the width direction. The tip opening was adjusted to face in a direction inclined 45 ° with respect to the sliding direction A.

更に、各エアー放出部１４に電磁弁を介してゲージ圧０.７ＭＰａの圧縮エアー供給配管を接続し、図３の紙面左側の３個のエアー放出部１４の電磁弁を上から２秒ずつ続けて開放させた後に引き続き同紙面右側の３個のエアー放出部１４の電磁弁を上から２秒ずつ続けて開放させることで構成される１２秒周期のエアー放出パターンを繰り返すことによって、シュート２内に常時いずれかのエアー放出部１４から圧縮エアーが吹き込まれるようにした。このようにして石灰石原料の粉砕処理を行った。   Furthermore, compressed air supply piping with a gauge pressure of 0.7 MPa is connected to each air release unit 14 via a solenoid valve, and the solenoid valves of the three air release units 14 on the left side of the paper surface of FIG. The chute 2 is repeated by repeating the air release pattern of 12 seconds cycle configured by continuously opening the solenoid valves of the three air release parts 14 on the right side of the same sheet from the top for 2 seconds successively after opening the The compressed air is constantly blown from any of the air discharge portions 14 to the Thus, the grinding process of the limestone raw material was performed.

比較のため、シュートに圧縮エアーを供給しない以外は上記と同様にして石灰石原料を粉砕処理した。これら圧縮エアーをシュートに吹き込んだ場合と吹き込まない場合の結果を下記表１に示す。   For comparison, the limestone raw material was pulverized in the same manner as described above except that compressed air was not supplied to the chute. The results when the compressed air is blown into the chute and when it is not blown are shown in Table 1 below.

Figure 2019112154
Figure 2019112154

上記表１の結果から分かるように、月間降雨量が５００ｍｍ／月程度の月で比較した場合、圧縮エアーをシュートに吹き込まない場合では１５回発生していた詰りが、圧縮エアーを吹き込むことにより２回に減少した。すなわち、石灰石スラリー調製設備に適用される石灰石原料用のシュートにおいて、その底面の幅方向両端部の複数個所にエアー放出部を設けて間欠的に圧縮エアーを吹き出すことによって、石灰石原料の含水率の性状が変動しても破砕機への定量供給をほぼ維持でき、よって従来の粉体付着防止装置に比べて小型且つ安価に破砕機の過負荷による設備停止を抑制することができる。   As can be seen from the results in Table 1 above, when the monthly rainfall is compared in the month of about 500 mm / month, the clogging that occurred 15 times when the compressed air is not blown into the chute is 2 by blowing the compressed air 2 Reduced to times. That is, in the chute for limestone raw material applied to a limestone slurry preparation facility, the air release parts are provided at a plurality of locations in the width direction both end portions of the bottom to intermittently blow compressed air to obtain moisture content of the limestone raw material. Even if the property changes, the fixed amount supply to the crusher can be substantially maintained, so that the equipment stop due to the overload of the crusher can be suppressed in a smaller size and at a lower cost than the conventional powder adhesion preventing device.

１ ベルトコンベア
２ シュート
３ 破砕機
１０ 底面
１１、１２ 側面
１３ 蓋部
１４ エアー放出部
Ａ 滑落方向
Ｒ 石灰石原料 DESCRIPTION OF SYMBOLS 1 Belt conveyor 2 Chute 3 Crusher 10 Bottom 11, 12 Side 13 Lid 14 Air discharge part A Sliding direction R Limestone raw material

Claims (5)

石灰石原料を供給する傾斜した底面とその幅方向両端部に位置する側面とを有するシュートであって、前記底面の幅方向両端部に、該底面に沿って滑落する石灰石原料の滑落方向の下流側に向って圧縮エアーを放出する複数のエアー放出部が配置されていることを特徴とするシュート。   It is a chute which has an inclined bottom which supplies limestone material, and the side located in the width direction both ends, and the downstream of the sliding direction of the limestone material which slides along the bottom in the width direction both ends of the bottom A chute characterized in that a plurality of air discharge parts are arranged to discharge compressed air toward the vehicle. 前記滑落方向の下流側に向う方向が、該滑落方向に対して２５〜４５°傾斜していることを特徴とする、請求項１記載のシュート。   The chute according to claim 1, wherein the downstream direction of the sliding direction is inclined at 25 to 45 with respect to the sliding direction. 前記底面の面積２.６ｍ２当たり６個以上のエアー放出部が配置されていることを特徴とする、請求項１又は２に記載のシュート。 The chute according to claim 1 or 2, wherein six or more air discharge parts are disposed per 2.6 m 2 of area of the bottom surface. 前記複数のエアー放出部に供給する圧縮エアーの圧力が０.７ＭＰａ以上であり、各エアー放出口からの圧縮エアーの放出時間を１回当たり１秒以上３秒以下とすることを特徴とする、請求項１〜３のいずれか１項に記載のシュート   The pressure of the compressed air supplied to the plurality of air discharge parts is 0.7 MPa or more, and the discharge time of the compressed air from each air discharge port is set to 1 second or more and 3 seconds or less per one operation. The chute according to any one of claims 1 to 3. 石灰石原料を供給する傾斜した底面とその幅方向両端部に位置する側面とを有するシュートの該両端部に、該底面に沿って滑落する石灰石原料の滑落方向の下流側に向って圧縮エアーを放出することを特徴とするシュート上の石灰石原料の堆積防止方法。   The compressed air is discharged toward the downstream side of the sliding direction of the limestone raw material sliding along the bottom surface at the both ends of the chute having the inclined bottom surface supplying the limestone raw material and the side surfaces located at the widthwise end portions thereof. Method for preventing deposition of limestone raw material on chute characterized by being.
JP2017244989A 2017-12-21 2017-12-21 Limestone raw material supply chute Active JP7069696B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2017244989A JP7069696B2 (en) 2017-12-21 2017-12-21 Limestone raw material supply chute

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2017244989A JP7069696B2 (en) 2017-12-21 2017-12-21 Limestone raw material supply chute

Publications (2)

Publication Number Publication Date
JP2019112154A true JP2019112154A (en) 2019-07-11
JP7069696B2 JP7069696B2 (en) 2022-05-18

Family

ID=67222978

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2017244989A Active JP7069696B2 (en) 2017-12-21 2017-12-21 Limestone raw material supply chute

Country Status (1)

Country Link
JP (1) JP7069696B2 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61114921A (en) * 1984-11-09 1986-06-02 Mitsubishi Heavy Ind Ltd Air slide transport apparatus
US4812085A (en) * 1985-01-15 1989-03-14 Swiss Aluminium Ltd. Conduit for transporting finely-divided or fine-granular, dry bulk materials and a process for operation of same
JPH061439A (en) * 1992-06-17 1994-01-11 Sun Tec:Kk Branch structure of transport path of air slide type conveyer
JPH1143215A (en) * 1997-07-24 1999-02-16 Nkk Corp Vibration feeder
JP2000153910A (en) * 1998-11-18 2000-06-06 Sintokogio Ltd Box-type chute device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61114921A (en) * 1984-11-09 1986-06-02 Mitsubishi Heavy Ind Ltd Air slide transport apparatus
US4812085A (en) * 1985-01-15 1989-03-14 Swiss Aluminium Ltd. Conduit for transporting finely-divided or fine-granular, dry bulk materials and a process for operation of same
JPH061439A (en) * 1992-06-17 1994-01-11 Sun Tec:Kk Branch structure of transport path of air slide type conveyer
JPH1143215A (en) * 1997-07-24 1999-02-16 Nkk Corp Vibration feeder
JP2000153910A (en) * 1998-11-18 2000-06-06 Sintokogio Ltd Box-type chute device

Also Published As

Publication number Publication date
JP7069696B2 (en) 2022-05-18

Similar Documents

Publication Publication Date Title
JP5543613B2 (en) Powder lime baking equipment
WO2011142688A1 (en) Apparatus for pneumatic vacuum separation of bulk materials
JP2008230825A (en) Powdery body transport method and powdery body transport device
JP5644582B2 (en) Method for suppressing dust generation during transport of powder
CN105292819A (en) Assembly for powder feeding bin
CN208666250U (en) The closed dust pelletizing system of belt conveyor
JP5724724B2 (en) Cement manufacturing apparatus and cement manufacturing method
JP2019112154A (en) Limestone raw material feeding chute
CN207188213U (en) A kind of Novel seed process equipment
CN211964515U (en) Manganese ore pellet preparation system
JP4110591B2 (en) Vibrating feeder
CN108393177A (en) Ground slag machining production line
RU78703U1 (en) INSTALLATION OF PNEUMATIC SEPARATION
CA2783495A1 (en) Method and apparatus for delivering a grinding media to a grinding mill
CN213434714U (en) Clay ore crushing device
CN210594334U (en) Connecting structure for powder bin and belt conveying mechanism
KR101002404B1 (en) A coal pulverization and distribution transfer device
CN210150351U (en) Handle environmental protection device of copper smelting mill fine dust
CN109536701B (en) Device and method for reducing powder content of lump ore
CN102166568A (en) Ash removal method for screening machines and ash removal device for screening machines
JPH0665394B2 (en) Fine powder separator for fine powder agglomerator of coke oven
CN205518554U (en) A screening plant for sieving impurity in grit aggregate
CN219859468U (en) Iron powder raw material adsorption conveying device
CN106269178B (en) A kind of raw material vertical-grinding system
CN206276482U (en) A kind of raw material vertical-grinding system

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20201028

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20210827

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20210907

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20211108

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20220405

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20220418

R150 Certificate of patent or registration of utility model

Ref document number: 7069696

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150