JP5540871B2 - Bulk ore processing method - Google Patents
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- JP5540871B2 JP5540871B2 JP2010104058A JP2010104058A JP5540871B2 JP 5540871 B2 JP5540871 B2 JP 5540871B2 JP 2010104058 A JP2010104058 A JP 2010104058A JP 2010104058 A JP2010104058 A JP 2010104058A JP 5540871 B2 JP5540871 B2 JP 5540871B2
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- 238000003672 processing method Methods 0.000 title claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 28
- 230000001133 acceleration Effects 0.000 claims description 24
- 238000005406 washing Methods 0.000 claims description 24
- 230000018044 dehydration Effects 0.000 claims description 14
- 238000006297 dehydration reaction Methods 0.000 claims description 14
- 239000010419 fine particle Substances 0.000 claims description 9
- 239000002352 surface water Substances 0.000 claims description 7
- 239000000843 powder Substances 0.000 description 29
- 208000005156 Dehydration Diseases 0.000 description 13
- 238000002474 experimental method Methods 0.000 description 10
- 238000010298 pulverizing process Methods 0.000 description 9
- 238000001035 drying Methods 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 229910052595 hematite Inorganic materials 0.000 description 2
- 239000011019 hematite Substances 0.000 description 2
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000003416 augmentation Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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Description
本発明は、高炉装入用の主原料の一部として使用する塊鉱石の処理方法に関するものである。 The present invention relates to a method for treating a lump ore used as a part of a main raw material for charging a blast furnace.
高炉で原料として使用する塊鉱石は、所定粒径、例えば６ｍｍ〜３０ｍｍに粒度調整された後、高炉に装入される。
通常、ヤードにおいて野積みされている入荷直後の塊鉱石の表面には微粒粉（例えば６ｍｍ未満の粉）が付着しているが、微粒粉が付着していると、これが炉内に持ち込まれて炉内通気に悪影響を与えることが懸念される。
そこで、このような微粒粉を除去することが必要となるが、雨の影響等で水分を含んだ微粒粉は塊鉱石表面に強固に付着しているため、例えば篩い分けによって除去することは難しい。
The lump ore used as a raw material in the blast furnace is adjusted to a predetermined particle size, for example, 6 mm to 30 mm, and then charged into the blast furnace.
Normally, fine powder (for example, powder of less than 6 mm) adheres to the surface of the lump ore just stacked in the yard, but if fine powder adheres, it is brought into the furnace. There is concern about adverse effects on furnace ventilation.
Therefore, it is necessary to remove such fine particles, but the fine particles containing moisture are strongly adhered to the surface of the lump ore due to the influence of rain and the like, so it is difficult to remove them by sieving, for example. .
そこで、塊鉱石の表面に付着している微粒粉を除去する技術として、特許文献１には、鉱石の水洗処理方法が提案されている。
特許文献１に提案された鉱石の水洗処理方法は、「微粒粉を含む塊鉱石をスクリーン式ジェット水洗機により洗浄し、該洗浄水を第１のスクリーン式脱水機により脱水して微粒粉を回収し、次いで前記第１のスクリーン式脱水機からの排出洗浄水を液体サイクロンに供給して細微粒粉を分離し、その後、分離された該細微粒粉を第２のスクリーン式脱水機により脱水して回収することを特徴とする鉱石の水洗処理方法。」（特許文献１の請求項１参照）というものである。
Therefore, as a technique for removing fine particles adhering to the surface of the lump ore, Patent Document 1 proposes a method for washing the ore with water.
The ore water washing method proposed in Patent Document 1 is “recovering fine powder by washing the lump ore containing fine powder with a screen jet water washer and dewatering the wash water with a first screen dehydrator. Then, the discharged washing water from the first screen type dehydrator is supplied to the hydrocyclone to separate the fine powder, and then the separated fine powder is dehydrated by the second screen dehydrator. The ore water-washing method characterized in that the ore is recovered "(see claim 1 of Patent Document 1).
また、特許文献２には、予め水洗処理した塊鉱石を焼結機の床敷として使用する技術が提案されている（特許文献２の請求項２参照）。 Patent Document 2 proposes a technique of using a lump ore previously washed with water as a floor for a sintering machine (see claim 2 of Patent Document 2).
特許文献１には、塊鉱石を水洗して微粒粉を除去すること、及び除去された微粒粉の処理に関しては述べられているが、水洗して水に濡れた塊鉱石のその後の処理については触れられていない。
塊鉱石は、炉内に向けて搬送されるが、塊鉱石が水に濡れた状態のまま搬送されると、その搬送過程においてベルトコンベアの搬送面や高炉用ホッパーの内壁に水分が付着して、それによって搬送過程で粉化した微粒粉が再び塊鉱石の表面に付着することが考えられる。また、濡れた状態の塊鉱石をそのまま炉内に装入すると、水分が炉内へ入るため、高炉の炉頂温度が低下してしまうことも懸念され、高炉でより多くの燃料が必要となるという問題もある。
Patent Document 1 describes washing the lump ore with water to remove the fine powder, and processing of the removed fine powder, but with regard to the subsequent treatment of the lump ore that has been washed and wetted with water. Not touched.
The lump ore is transported toward the furnace, but if the lump ore is transported in a wet state, moisture adheres to the conveyor surface of the belt conveyor and the inner wall of the blast furnace hopper during the transport process. Thus, it is conceivable that the fine powder pulverized in the conveying process adheres again to the surface of the lump ore. In addition, if the wet ore in a wet state is charged into the furnace as it is, moisture enters the furnace, so there is a concern that the top temperature of the blast furnace will decrease, and more fuel is required in the blast furnace. There is also a problem.
他方、特許文献２においては、水洗した塊鉱石を焼結機の床敷として使用することで、濡れた塊鉱石を熱によって乾燥することが述べられている。
しかし、焼結機の床敷として使用することで塊鉱石を乾燥させるというのでは、炉内への塊鉱石の効率的な装入には利用できない。また、焼結機の生産性低下、使用する鉱石性状が制限されるといった問題もある。
On the other hand, Patent Document 2 describes that wet ore is dried by heat by using the washed ore as a bed for a sintering machine.
However, drying the lump ore by using it as a floor for a sintering machine cannot be used for efficient loading of the lump ore into the furnace. In addition, there is a problem that the productivity of the sintering machine is lowered and the properties of the ore to be used are limited.
本発明はかかる課題を解決するためになされたものであり、微粒粉の付着がなく効率的に高炉に装入できる塊鉱石の処理方法を提供することを目的としている。 This invention is made | formed in order to solve this subject, and it aims at providing the processing method of the lump ore which can be charged in a blast furnace efficiently without adhesion of fine powder.
発明者は、塊鉱石に付着している微粒粉を除去し、水分が高炉へ入るのをできるだけ抑制するにはいかにするべきかを検討した。
まず、ヤードにおいて野積みされている塊鉱石に付着している微粒粉を除去するには、水洗することが効果的であるとの結論に達した。しかし、水洗することで付着する水分を処理しないと、上述したように、ベルトコンベアなどによる搬送過程で微粒粉が塊鉱石の表面に再び付着するという問題がある。また、水分が炉内へ入るため、高炉の炉頂温度が低下してしまうことも懸念され、高炉でより多くの燃料が必要となるという問題もある。
The inventor examined how to remove the fine particles adhering to the lump ore and suppress the entry of moisture into the blast furnace as much as possible.
First, it was concluded that washing with water was effective in removing fine particles adhering to the lump ore piled up in the yard. However, if the water adhering to it by washing with water is not treated, as described above, there is a problem that the fine powder adheres again to the surface of the lump ore during the conveyance process by a belt conveyor or the like. In addition, since moisture enters the furnace, there is a concern that the top temperature of the blast furnace will decrease, and there is a problem that more fuel is required in the blast furnace.
そこで、水洗した塊鉱石から水分を除去する必要があるが、この水分除去の方法として一般的に考えられるのは、熱風によって乾燥するという方法である。この点、特許文献２の方法もこれに近いものである。
しかし、発明者の検討によると、例えば積層された塊鉱石の下方から熱風を当てるようにして乾燥するようにした場合、熱風が直接当たる下層部分の塊鉱石の乾燥は可能でも、より上層にある塊鉱石には飽和蒸気を含んだ熱風が当たり、乾燥されにくく、効率が悪いということがわかった。つまり、このような乾燥方法ではコスト高につながる上、ＣＯ２の排出量も大きいという問題もある。
Therefore, it is necessary to remove water from the lump ore washed with water, and a method generally considered as a method for removing water is to dry with hot air. In this respect, the method of Patent Document 2 is similar to this.
However, according to the inventor's study, for example, when drying is performed by applying hot air from below the laminated ore, it is possible to dry the lower part of the ore directly hitting the hot air, but it is in the upper layer It was found that the lump ore hits with hot air containing saturated steam, and is difficult to dry, resulting in poor efficiency. In other words, such a drying method leads to high costs and a problem of large CO 2 emission.
塊鉱石に付着している水分の状況を確認したところ、水分の大部分は塊鉱石の表面近くに付着しており、内部への浸透は少ないことが分かった。また、塊鉱石の水分を除去することの意義としては、搬送過程での微粒粉の付着防止と、水分の炉内への浸入抑制である。とすれば、塊鉱石の水分除去にとって重要なことは、その内部まで乾燥させるような方法は必要なく、表面付着している水分を効果的に除去し、しかも粉化が生じないことである。
そこで、このような水分除去方法について検討した結果、遠心力を使って塊鉱石から水分を分離することを考え、実験を行ったところ、水洗した塊鉱石を遠心方式の脱水機に投入することで、粉化を生ずることなく表面付着水を効果的に除去できるとの知見を得た。
When the condition of moisture adhering to the lump ore was confirmed, it was found that most of the moisture was adhering near the surface of the lump ore and the penetration into the inside was small. In addition, the significance of removing the moisture of the lump ore is prevention of adhesion of fine particles during the conveyance process and suppression of the penetration of moisture into the furnace. If this is the case, what is important for the removal of water from the massive ore is that there is no need for a method of drying the inside of the ore, and that the water adhering to the surface is effectively removed and no pulverization occurs.
Therefore, as a result of examining such a water removal method, considering that the water is separated from the lump ore using centrifugal force, an experiment was conducted, and the washed lump ore was put into a centrifugal dehydrator. The present inventors have obtained knowledge that surface adhering water can be effectively removed without causing pulverization.
本発明は以上のような考察と研究によって得られた知見を基になされたものであり、具体的には以下の構成からなるものである。 The present invention has been made on the basis of the above-described consideration and research, and specifically comprises the following configuration.
（１）本発明に係る塊鉱石の処理方法は、高炉に装入する塊鉱石の処理方法であって、前記塊鉱石を水洗する水洗工程と、水洗により6mm未満の微粒粉を除去した塊鉱石を遠心脱水方式の脱水機に投入して表面水を除去する脱水工程とを備え、前記脱水工程における遠心脱水機の回転数を、鉱石にかかる遠心加速度が４００ｍ／ｓｅｃ ２ 以上、７００ｍ／ｓｅｃ ２ 以下になるように調整することを特徴とするものである。
(1) The lump ore processing method according to the present invention is a lump ore treatment method charged in a blast furnace, wherein the lump ore is washed with water, and the lump ore from which fine particles less than 6 mm have been removed by washing. In a centrifugal dehydration type dehydrator to remove surface water, and the rotational speed of the centrifugal dehydrator in the dehydration process is set such that the centrifugal acceleration applied to the ore is 400 m / sec 2 or more and 700 m / sec 2. It adjusts so that it may become the following .
本発明においては、高炉に装入する塊鉱石の処理方法であって、前記塊鉱石を水洗する水洗工程と、水洗により6mm未満の微粒粉を除去した塊鉱石を遠心脱水方式の脱水機に投入して表面水を除去する脱水工程とを備え、前記脱水工程における遠心脱水機の回転数を、鉱石にかかる遠心加速度が４００ｍ／ｓｅｃ ２ 以上、７００ｍ／ｓｅｃ ２ 以下になるように調整するようにしたので、塊鉱石の表面に付着した微粒粉を効果的に除去でき、さらに塊鉱石の表面に付着した水分を塊鉱石に粉化を生ずることなく効果的に除去できるので、微粒粉の付着がなく効率的に高炉に装入できる塊鉱石を得ることができる。
In the present invention, a method for processing a lump ore charged in a blast furnace, the water washing step of washing the lump ore, and lump ore from which fine powder less than 6 mm has been removed by water washing is put into a centrifugal dehydration dehydrator And removing the surface water, and adjusting the rotational speed of the centrifugal dehydrator in the dehydration process so that the centrifugal acceleration applied to the ore is 400 m / sec 2 or more and 700 m / sec 2 or less. As a result, the fine powder adhering to the surface of the lump ore can be effectively removed, and the water adhering to the surface of the lump ore can be effectively removed without causing pulverization of the lump ore. It is possible to obtain a lump ore that can be charged efficiently into the blast furnace.
本実施の形態に係る塊鉱石の処理方法は、図１の処理工程の説明図に示すように、６ｍｍ未満の微粒粉１が付着した塊鉱石３を水洗する水洗工程（Ｓ１）と、水洗した塊鉱石３を遠心脱水方式の脱水機に投入して表面水５を除去する脱水工程（Ｓ２）とを備え、脱水工程を経た塊鉱石３を高炉に装入する工程を備えている。
以下、主な工程を詳細に説明する。
In the lump ore processing method according to the present embodiment, as shown in the explanatory diagram of the processing step in FIG. 1, a water washing step (S1) for washing the lump ore 3 to which the fine powder 1 of less than 6 mm is adhered and the water washing are performed. A dehydration step (S2) in which the lump ore 3 is put into a centrifugal dehydration type dehydrator to remove the surface water 5, and a lump ore 3 that has undergone the dehydration step is charged into a blast furnace.
Hereinafter, main steps will be described in detail.
＜水洗工程＞
水洗工程は塊鉱石３の表面に付着した６ｍｍ未満の微粒粉１を水洗により除去する工程である。水洗方法は、特に限定されるわけではなく、例えば高圧水を塊鉱石３に散水して行う方法でもよいし、あるいは塊鉱石３を回転ドラム型水洗装置に装入して水洗する方法でもよいし、またあるいはスクリーン式のジェット水洗機によって水洗する方法でもよい。
<Washing process>
The water washing step is a step of removing the fine powder 1 of less than 6 mm adhered to the surface of the lump ore 3 by washing with water. The washing method is not particularly limited, and for example, a method in which high-pressure water is sprinkled on the lump ore 3 or a method in which the lump ore 3 is charged in a rotary drum type washing apparatus and washed with water may be used. Alternatively, a method of washing with a screen-type jet washing machine may be used.
＜脱水工程＞
脱水工程は、水洗した塊鉱石３を遠心脱水方式の脱水機に投入し表面水５を除去する工程である。
脱水機の構造は特に限定されるものではなく、公知のものを利用することができ、例えば図２に示すような、＜工場操作シリーズ＞増補・遠心分離、化学工業所、昭和49年6月15日初版、p.227に記載された竪型連続式遠心脱水機７を利用できる。
図２に示した竪型連続式遠心脱水機７は、図示しないモータによって回転する駆動軸９と、該駆動軸９に固定されたバスケット１１と、バスケット１１に装備された逆円錐台状のスクリーン１３と、塊鉱石３を装入するためのホッパー１５とを備えている。
ホッパー１５に投入された塊鉱石３は、ホッパー１５を通り、高速回転するスクリーン面に供給される。スクリーン面に供給された塊鉱石３は、遠心力を受けて脱水され、スクリーン面を徐々に上昇してスクリーン面の上縁部から固体排出口１７側へ落下して排出される。他方、脱水された水はスクリーン１３を通過して液体排出口１９から排出される。
<Dehydration process>
The dehydration step is a step of removing the surface water 5 by putting the lump ore 3 washed with water into a centrifugal dehydration type dehydrator.
The structure of the dehydrator is not particularly limited, and a known one can be used. For example, as shown in FIG. 2, <Factory Operation Series> Augmentation / Centrifuge Separation, Chemical Industry, June 1974 The vertical continuous centrifugal dehydrator 7 described in the first edition on the 15th, p.227 can be used.
A vertical continuous centrifugal dehydrator 7 shown in FIG. 2 includes a drive shaft 9 that is rotated by a motor (not shown), a basket 11 that is fixed to the drive shaft 9, and an inverted frustoconical screen mounted on the basket 11. 13 and a hopper 15 for charging the lump ore 3.
The lump ore 3 charged into the hopper 15 passes through the hopper 15 and is supplied to the screen surface that rotates at high speed. The lump ore 3 supplied to the screen surface is dewatered by receiving centrifugal force, gradually rises on the screen surface, falls from the upper edge of the screen surface to the solid discharge port 17 side, and is discharged. On the other hand, the dehydrated water passes through the screen 13 and is discharged from the liquid discharge port 19.
上記のような連続式の遠心脱水機を用いることで、塊鉱石３の表面の水分を効率的に脱水処理できる。
なお、連続式の遠心脱水機は、図２に示すような竪型のものに限定されず、スクリーン１３を横向きに設置した横型の遠心脱水機であってもよい。
By using the continuous centrifugal dehydrator as described above, the moisture on the surface of the lump ore 3 can be efficiently dehydrated.
The continuous centrifugal dehydrator is not limited to the vertical type as shown in FIG. 2 and may be a horizontal centrifugal dehydrator in which the screen 13 is installed sideways.
連続式の遠心脱水機によって塊鉱石３を脱水処理した場合の、塊鉱石３に残留する水分と塊鉱石３に作用する遠心加速度との関係を実験によって調査した。
使用した塊鉱石３は、水洗により６ｍｍ未満の微粒粉を除去したヘマタイト系の鉱石Ａと、同じく水洗処理をしたピソライト系の鉱石Ｂである。ヘマタイト系の鉱石Ａは気孔率が小さく比較的粘りのある鉱石であり、ピソライト系の鉱石Ｂは気孔率が大きく比較的もろい鉱石である。
また、使用した連続式遠心脱水機は、スクリーンを横型にした横型遠心脱水装置を用いた。装置内での鉄鉱石の滞留時間は１〜４秒であった。
The relationship between the moisture remaining in the lump ore 3 and the centrifugal acceleration acting on the lump ore 3 when the lump ore 3 was dehydrated by a continuous centrifugal dehydrator was investigated by experiments.
The lump ore 3 used is a hematite ore A from which fine particles of less than 6 mm have been removed by washing with water, and a pisolite ore B that has also been washed with water. The hematite ore A is an ore having a small porosity and a relatively stickiness, and the pisolite ore B is a ore having a large porosity and a relatively brittleness.
The continuous centrifugal dehydrator used was a horizontal centrifugal dehydrator with a horizontal screen. The residence time of the iron ore in the apparatus was 1 to 4 seconds.
図３はこの実験結果を示すグラフであり、縦軸が残留水分量（質量％）、横軸が遠心加速度（ｍ／ｓｅｃ２）である。図３のグラフに示されるように、残留水分量が鉱石Ａの場合であれば６．０質量％程度、鉱石Ｂの場合であれば６．８質量％程度まで減少すると、遠心加速度をさらに大きくしても残留水分量は減少することなくほぼ一定になることがわかった。残留水分量の減少がストップするときの遠心加速度は約４００ｍ／ｓｅｃ２であった。したがって、残留水分量を減少させるという観点からは遠心加速度は４００ｍ／ｓｅｃ２以上であることが好ましい。もっとも、遠心加速度が４００ｍ／ｓｅｃ２を超えてさらに大きくなっても、脱水の効果が大きくならないことから、遠心加速度を４００ｍ／ｓｅｃ２より相当程度大きくしてもエネルギーの無駄になるため、上限値としては例えば、１０００ｍ／ｓｅｃ２以下、さらにエネルギーの無駄をなくすには７００ｍ／ｓｅｃ２以下、あるいは５００ｍ／ｓｅｃ２以下にするのも好ましい。
FIG. 3 is a graph showing the results of this experiment. The vertical axis represents the residual moisture content (mass%), and the horizontal axis represents the centrifugal acceleration (m / sec 2 ). As shown in the graph of FIG. 3, if the residual water content is about 6.0% by mass in the case of the ore A and about 6.8% by mass in the case of the ore B, the centrifugal acceleration is further increased. Even so, it was found that the amount of residual water remained almost constant without decreasing. The centrifugal acceleration when the decrease in the residual water content stopped was about 400 m / sec 2 . Therefore, from the viewpoint of reducing the residual moisture content, the centrifugal acceleration is preferably 400 m / sec 2 or more. However, even when larger centrifugal acceleration exceeds the 400 meters / sec 2, since the effect of dehydration is not increased, to become a waste of energy and considerable extent greater than 400 meters / sec 2 the centrifugal acceleration, the upper limit value For example, 1000 m / sec 2 or less is preferable, and 700 m / sec 2 or less or 500 m / sec 2 or less is also preferable in order to eliminate waste of energy.
脱水処理後の鉱石Ａ、Ｂの外観調査をしたところ、両者共に表面は乾いており、本発明方法によれば鉱石の表面に付着した表面水５を除去できることが確認できた。この結果、鉱石運搬中のベルトコンベアや高炉用ホッパーの内壁を濡らしたり、再び微粒粉１が塊鉱石３の表面に付着したりする問題が解決されることが実証された。 When the appearances of the ores A and B after the dehydration treatment were examined, the surfaces of both the ores A and B were dry, and it was confirmed that the surface water 5 adhering to the ore surface could be removed according to the method of the present invention. As a result, it was proved that the problems of wetting the inner walls of the belt conveyor and the blast furnace hopper during ore transportation and the fine powder 1 adhering to the surface of the lump ore 3 were solved.
塊鉱石３を水洗して微粒粉１を除去しても、脱水工程で粉化が生じて粉が発生すると効果が半減することから、連続式遠心脱水機を用いた場合の粉化発生の有無についても調査した。使用した塊鉱石３及び脱水装置は実施例１と同様である。
実験は、鉱石にかかる遠心加速度を変化させて、粉化の状況を確認した。
Even if the coarse ore 3 is washed with water and the fine powder 1 is removed, if the powder is generated in the dehydration process and the powder is generated, the effect is halved. Whether or not powder is generated when a continuous centrifugal dehydrator is used We also investigated. The lump ore 3 and the dehydrating apparatus used are the same as those in Example 1.
In the experiment, the centrifugal acceleration applied to the ore was changed to confirm the state of pulverization.
図４はこの実験の結果を示すグラフであり、縦軸が６ｍｍ未満の微粒粉１の含有比率（質量％）、横軸が遠心加速度（ｍ／ｓｅｃ２）である。
図４のグラフに示されるように、実験前は６ｍｍ未満の微粒粉１が含まれていなかったものが、遠心加速度５００ｍ／ｓｅｃ２で実験した後は、鉱石Ａでは１．４質量％、鉱石Ｂでは２．８質量％であった。また、遠心加速度１０００ｍ／ｓｅｃ２で実験した後は、鉱石Ａでは７．１質量％、鉱石Ｂでは１３．３質量％であった。さらに、遠心加速度３０００ｍ／ｓｅｃ２で実験した後は、鉱石Ａでは１８．０質量％、鉱石Ｂでは３２．０質量％であった。
この実験から、遠心加速度が大きくなるにしたがって微粒粉１の含有比率が増加することが分かった。
炉内の通気性を保持するという観点からは微粒粉１の含有比率を５質量％未満にする必要があることから、微粒粉１の含有比率を５質量％未満にするための遠心加速度を図４のグラフから読み取ると７００ｍ／ｓｅｃ２以下である。
したがって、塊鉱石３の粉化を５質量％未満にするためには遠心加速度を７００ｍ／ｓｅｃ２以下にする必要がある。
FIG. 4 is a graph showing the results of this experiment, where the vertical axis represents the content ratio (% by mass) of the fine powder 1 having a size of less than 6 mm, and the horizontal axis represents the centrifugal acceleration (m / sec 2 ).
As shown in the graph of FIG. 4, the powder that did not contain the fine powder 1 of less than 6 mm before the experiment was 1.4% by mass in the ore A after the experiment with a centrifugal acceleration of 500 m / sec 2. In B, it was 2.8 mass%. Further, after an experiment at a centrifugal acceleration of 1000 m / sec 2 , the ore A was 7.1% by mass and the ore B was 13.3% by mass. Further, after an experiment at a centrifugal acceleration of 3000 m / sec 2 , the ore A was 18.0% by mass and the ore B was 32.0% by mass.
From this experiment, it was found that the content ratio of the fine powder 1 increases as the centrifugal acceleration increases.
From the viewpoint of maintaining air permeability in the furnace, the content ratio of the fine powder 1 needs to be less than 5% by mass, and therefore the centrifugal acceleration for reducing the content ratio of the fine powder 1 to less than 5% by mass is illustrated. It is 700 m / sec 2 or less when read from the graph of 4.
Therefore, in order to reduce the pulverization of the lump ore 3 to less than 5% by mass, the centrifugal acceleration needs to be 700 m / sec 2 or less.
発明者は、遠心加速度が増すと塊鉱石３の粉化が増すことの原因を調査したところ、遠心加速度が増すとスクリーン１３の回転数が増し、より高速回転になったスクリーン１３に塊鉱石３が投入される際に塊鉱石３に破砕が生ずることが主な原因であるとの知見を得た。
したがって、高速回転するスクリーン１３に投入口から連続的に塊鉱石３を装入するタイプの連続式遠心脱水機においては、塊鉱石３の粉化を５質量％未満にするためには遠心加速度を７００ｍ／ｓｅｃ２以下にするのが好ましいが、投入時に塊鉱石３とスクリーン１３の接触による粉化を抑制する手段を設けたり、あるいはバッチ式の遠心脱水機を用いたりするなどして塊鉱石３の投入時の粉化を防止するようにすれば必ずしも遠心加速度を７００ｍ／ｓｅｃ２以下にする必要はない。
Inventor, it was investigate the cause of increasing the pulverization of lumps ore 3 the centrifugal acceleration increases, the centrifugal acceleration increases increases the rotational speed of the screen 13, lump ore 3 to the screen 13 becomes faster rotation It has been found that the main cause is the occurrence of crushing in the lump ore 3 when.
Accordingly, in the continuous centrifugal dehydrator of the type in which the lump ore 3 is continuously charged into the screen 13 that rotates at a high speed from the inlet, the centrifugal acceleration is set to be less than 5% by mass in the lump ore 3 pulverization. 700 m / sec 2 or less is preferable, but a means for suppressing pulverization due to contact between the lump ore 3 and the screen 13 at the time of charging, or a lump ore 3 is used. If the pulverization at the time of charging is prevented, the centrifugal acceleration is not necessarily 700 m / sec 2 or less.
１ 微粒粉
３ 塊鉱石
５ 表面水
７ 竪型連続式遠心脱水機
９ 駆動軸
１１ バスケット
１３ スクリーン
１５ ホッパー
１７ 固体排出口
１９ 液体排出口
DESCRIPTION OF SYMBOLS 1 Fine powder 3 Lump ore 5 Surface water 7 Vertical continuous centrifugal dehydrator 9 Drive shaft 11 Basket 13 Screen 15 Hopper 17 Solid discharge port 19 Liquid discharge port
Claims (1)
This is a method for treating lump ore charged in a blast furnace, wherein the lump ore is washed with water, and lump ore from which fine particles less than 6 mm have been removed by water washing is put into a centrifugal dehydration type dehydrator to remove surface water. A lump ore comprising: a dewatering step for removing, and adjusting a rotational speed of a centrifugal dehydrator in the dewatering step so that a centrifugal acceleration applied to the ore is 400 m / sec 2 or more and 700 m / sec 2 or less Processing method.
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