JP5163062B2 - Blast furnace operation method - Google Patents
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- JP5163062B2 JP5163062B2 JP2007290439A JP2007290439A JP5163062B2 JP 5163062 B2 JP5163062 B2 JP 5163062B2 JP 2007290439 A JP2007290439 A JP 2007290439A JP 2007290439 A JP2007290439 A JP 2007290439A JP 5163062 B2 JP5163062 B2 JP 5163062B2
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Description
本発明は、製鉄プロセスにおいて、鉄鉱石等の高炉原料を篩い分けし、微粉を事前除去して高炉操業を効率的に行う手法に関する。 The present invention relates to a method for efficiently performing blast furnace operation by sieving blast furnace raw materials such as iron ore and removing fine powder in advance in an iron making process.
高炉を始めとする竪型炉による製鉄プロセスにおいては、充填層内に還元ガスを流通させて鉄鉱石を還元する必要があるため、効率的な操業を行う為には還元ガスが流通可能な空隙を確保する必要があり、鉄鉱石、コークス、焼結鉱等の装入原料は事前に微粉を除去しておく事が望ましい。このため各製鉄所においてはこれらの製鉄用原料から微粉を除去する篩い設備（振動篩い）を有している。しかしながらヤードで保管する原料等は、原料の保管の際、雨天等により水分含有率が高くなると微粉の付着力が高まるため、従来の篩いによる微粉除去は十分ではなかった。特に鉄鉱石は水分との親和性が高く、湿潤時の微粉の除去が非常に困難である。また、篩いのスクリーン上に粘土状の原料が付着して目詰まりを発生させる要因となっている。このため水分付着性の高い原料の篩い設備においては、通常目開きが大きい篩いが使用されてきた。たとえば、同じ高炉原料でも、焼結工場から直接送られる焼結鉱は殆ど水分を含まず微粉が落下しやすい為、微粉除去のために通常目開き４〜６ｍｍの篩いが使用されているが、水分を含み微粉が付着している事が多い鉄鉱石の場合、粉の除去性能を高め目詰まりを抑制するため通常目開き１０ｍｍ程度の篩いが使用されている。つまり通常高炉原料としてそのまま使用できる４〜１０ｍｍの範囲の原料も篩い落とす事になり、歩留まりを大幅に低下させる要因となっている。また、目開き１０ｍｍの篩いを用いた場合でも、依然１ｍｍ以下の微粉の一部は１０ｍｍ以上の鉱石に付着して落下せず、粉除去効率は大幅には向上していない。 In ironmaking processes using vertical furnaces such as blast furnaces, it is necessary to circulate reducing gas in the packed bed to reduce iron ore. It is desirable to remove fine powder in advance for the charging materials such as iron ore, coke, and sintered ore. For this reason, each steelworks has a sieving facility (vibrating sieving) for removing fine powder from these ironmaking raw materials. However, the raw material stored in the yard has not been sufficiently removed by conventional sieving since the adhesion of fine powder increases when the moisture content increases due to rain or the like during storage of the raw material. In particular, iron ore has a high affinity with moisture, and it is very difficult to remove fine powder when wet. In addition, the clay-like raw material adheres to the screen of the sieve and becomes a factor causing clogging. For this reason, in a raw material sieving equipment having a high moisture adhesion, a sieving having a large mesh has been used. For example, even in the same blast furnace raw material, since the sintered ore sent directly from the sintering plant contains almost no water and fine powder easily falls, a sieve with an opening of 4 to 6 mm is usually used for fine powder removal. In the case of iron ore that contains moisture and often has fine powder adhered thereto, a sieve having an opening of about 10 mm is usually used in order to improve the powder removal performance and suppress clogging. That is, the raw material in the range of 4 to 10 mm that can be used as it is as a normal blast furnace raw material is also screened out, which is a factor for greatly reducing the yield. Further, even when a sieve having an opening of 10 mm is used, a part of fine powder of 1 mm or less still adheres to ore of 10 mm or more and does not fall, and the powder removal efficiency is not significantly improved.
鉄鉱石のような湿潤状態の原料の粉除去効率を向上させることのできる篩い分け手段としては、伸縮可能な篩網と、これを上下左右に連動させて変形しながら原料を運搬する可動機構を有する特殊スクリーン、例えばジャンピングスクリーン（登録商標）が知られている。ジャンピングスクリーン（登録商標）では、ウレタン製の網目に対して引っ張り・ゆるめの繰り返し運動を与える事により原料を跳ね上げ、落下の際の衝撃力で付着粉を分散させる効果が期待できる。また、網目が常に変形する為、湿潤原料を使用しても目詰まりが起こりにくいとされている。 As a sieving means that can improve the powder removal efficiency of wet raw materials such as iron ore, an expandable sieve mesh and a movable mechanism that conveys the raw material while deforming it in conjunction with up and down and left and right A special screen having, for example, a jumping screen (registered trademark) is known. With Jumping Screen (registered trademark), it is possible to expect the effect of dispersing the adhered powder by the impact force at the time of dropping, by applying the repetitive movement of pulling and loosening to the mesh made of urethane. Further, since the mesh is always deformed, clogging is unlikely to occur even when a wet raw material is used.
篩い分け以外の湿潤状態の原料の付着粉除去方法として、微粉が付着した鉄鉱石をスクリーン式ジェット洗浄機で水洗処理して付着粉を除去する方法が知られている（例えば、特許文献１参照。）。洗浄水をスクリーン上で勢い良く噴射するため鉄鉱石付着粉がきれいに洗浄され、付着粉を含んだ洗浄液はスクリーン式脱水機と液体サイクロンによって効率的に処理が可能であるとされている。
上記のように、従来、湿潤時の付着粉が多い高炉原料は目開きの大きな篩い目を有する篩いで分級されてきたが、歩留が大幅に低下するものの依然篩い上に付着粉が混入し、付着粉除去効果は大きくなかった。 As mentioned above, blast furnace raw materials with a large amount of adhering powder when wet have been classified with a sieve having a large mesh opening, but the yield is greatly reduced, but the adhering powder is still mixed on the sieve. The adhering powder removal effect was not great.
また特殊スクリーンを用いた篩い分け法では、湿潤状態の原料の付着粉の分離性能は期待できるものの、スクリーン材質がウレタン等の樹脂材質で構成されており、さらに常に変形・伸縮するため、特に鉄鉱石などの硬質で比重の大きい材料を用いる場合、耐久性に問題がある。スクリーンの耐久性が低いと、スクリーン交換に伴うランニングコストが高額になるばかりでなく、交換のためにラインを止める頻度が高くなり、生産性悪化の大きな要因となる可能性が有る。また、従来製鉄所内で用いられている振動スクリーンとは形式が大きく異なるため、従来のスクリーンを撤去して新たに特殊スクリーンの設備を建設する必要があり、莫大な設備費用が必要になると予測される。従って、特殊スクリーンは製鉄原料用の篩い分け方法としてあまり普及していない。 In addition, the sieving method using a special screen can be expected to separate the adhering powder of the raw material in the wet state, but the screen material is made of a resin material such as urethane, and is constantly deformed and stretched. When using a hard material with a large specific gravity such as stone, there is a problem in durability. If the durability of the screen is low, not only the running cost associated with the screen replacement becomes high, but also the frequency of stopping the line for replacement becomes high, which may be a major factor in the deterioration of productivity. In addition, since the screen is very different from the vibrating screen used in the conventional steelworks, it is necessary to remove the conventional screen and construct a new special screen facility, which is expected to require enormous facility costs. The Therefore, special screens are not very popular as a sieving method for steelmaking raw materials.
さらに、スクリーン式ジェット洗浄機を用いて鉄鉱石を水洗処理する方法では、スクリーン式ジェット洗浄機、スクリーン式脱水機、液体サイクロン等の設備を新たに建設するために巨額の建設コストが必要となる。また特に鉄鉱石微粉を含んだ水処理に際しては、設備の磨耗が激しいためメンテナンスコストが高額になるという問題がある。さらに洗浄後の鉄鉱石に付着した水分による高炉への持ち込み水分が増加し、高炉炉頂温度を低下させ、操業を不安定化する要因となる可能性が有る。 Furthermore, in the method of washing iron ore with a screen jet washer, a huge construction cost is required to newly construct equipment such as a screen jet washer, a screen dehydrator, and a hydrocyclone. . Further, particularly in water treatment containing iron ore fine powder, there is a problem in that maintenance costs are high due to severe equipment wear. Furthermore, the moisture brought into the blast furnace due to the water adhering to the iron ore after washing may increase, lowering the blast furnace top temperature and destabilizing the operation.
そこで、本発明では、従来の篩い設備をそのまま有効活用することが可能であり、比較的安価に鉄鉱石等の高炉原料の付着粉除去性能を向上させることのできる高炉の操業方法を提供することを目的とする。 Therefore, in the present invention, it is possible to effectively use the conventional sieving equipment as it is, and provide a blast furnace operating method capable of improving the adhesion powder removal performance of blast furnace raw materials such as iron ore at a relatively low cost. With the goal.
本発明者らは、前記課題を解決するために、従来用いられている汎用の振動篩いを用いて、高炉原料の水分による付着粉を効率的に除去する手法について検討した。付着粉は水分の架橋効果によって高炉原料に付着しているものと考えられる。よって、水分を除去する事が出来れば水分架橋の数が低減し、除去量が増加する可能性が有る。そこで水分量による付着粉除去効果について実験を行った。乾燥した鉄鉱石を準備し、一定の粒度分布になるように配合し、それぞれ鉱石質量比３％〜１２％の水分を添加し、２０ｃｍφ丸篩いを用いて９．５ｍｍの網目で篩い分け試験を行った。各試験において鉱石質量は１ｋｇとした。また篩い分けに際してはロータップ式の振動篩いを用い、同一の振動を３０秒間与えるものとし、この際発生した篩い下を十分に乾燥し、質量を測定した。結果を、表１に示す。 In order to solve the above-mentioned problems, the present inventors have studied a method for efficiently removing adhering powder due to moisture in a blast furnace raw material using a conventional general-purpose vibration sieve. It is considered that the adhering powder adheres to the blast furnace raw material due to the cross-linking effect of moisture. Therefore, if moisture can be removed, the number of moisture crosslinks may be reduced, and the removal amount may increase. Then, it experimented about the adhesion powder removal effect by the amount of moisture. Prepare dry iron ore, mix it so as to have a certain particle size distribution, add water of 3% to 12% of the ore mass ratio, respectively, and conduct a sieving test with a 9.5 mm mesh using a 20 cmφ round sieve. went. In each test, the ore mass was 1 kg. Further, when sieving, a low-tap type vibration sieve was used, and the same vibration was applied for 30 seconds. The generated under-sieving was sufficiently dried and the mass was measured. The results are shown in Table 1.
篩い下質量比率（篩い下質量÷初期質量×１００）が少ないものほど篩い上鉄鉱石に対する付着粉が多いと考えられるので、表１の結果によれば、水分添加量が３ｍａｓｓ％〜７ｍａｓｓ％（水分含有量：２．９ｍａｓｓ％〜６．５ｍａｓｓ％）では、水分添加量が多いほど付着粉量が増える事が示されている。しかしながら水分添加量７〜９ｍａｓｓ％（水分含有量：６．５ｍａｓｓ％以上）においては逆に水分量が増加するに従い付着粉が減少することが確認された。これは、添加水分量９％以上（水分含有量８．３％以上）においては、水分が粒子全体に充満しさらに過剰な状態にあるため水分により洗浄されるような形態となり、微粉が落下しやすくなるためであると考えられる。このような水分過多の条件下では粉除去性能は向上するが、篩い下粉は泥水状となり、ベルトコンベアでの運搬が困難になる等、篩い下粉の取り扱いが困難に成るため実際には適用不可能である。このように水分含有濃度によって付着粉の挙動が変化するため、水分添加量７ｍａｓｓ％を境として水分を除去もしくは水分を更に添加することにより付着粉除去が可能であるが、水分を添加して洗浄状態にする事は現篩い設備においては現実的ではないので、水分を積極的に除去すべきであると考えられる。そして、全ての水分濃度において付着粉を効率的に除去する為には、高い水分含有量条件下でも素早く大量に水分を吸収し、乾燥状態に近づける事の出来る高い水分吸収性能を持った水分吸収剤を篩い前に添加することが有効であることを見出した。 As the mass ratio under the sieve (the mass under the sieve ÷ the initial mass × 100) is smaller, it is considered that the adhering powder to the iron ore on the sieve is larger. Therefore, according to the results in Table 1, the water addition amount is 3 mass% to 7 mass% Water content: 2.9 mass% to 6.5 mass%) indicates that the amount of adhering powder increases as the amount of water added increases. However, it was confirmed that the adhering powder decreased as the water content increased when the water content was 7-9 mass% (water content: 6.5 mass% or more). This is because when the added water content is 9% or more (water content is 8.3% or more), the entire particle is filled with water and is in an excessive state, so that it is washed with water and fine powder falls. This is thought to be easier. Under such excessive moisture conditions, the powder removal performance is improved. However, undersieving powder becomes muddy and difficult to transport on a belt conveyor, so it is difficult to handle undersieving powder. Impossible. In this way, the behavior of the adhering powder changes depending on the moisture content concentration. Therefore, it is possible to remove the adhering powder by removing the moisture or adding more water at the water addition amount of 7 mass%. Since it is not practical for the current sieving equipment to be in a state, it is considered that moisture should be actively removed. And in order to efficiently remove the adhering powder at all moisture concentrations, moisture absorption with high moisture absorption performance that can absorb a large amount of moisture quickly even under high moisture content conditions and can be brought close to a dry state. It has been found that it is effective to add the agent before sieving.
本発明はこのような知見に基づきなされたもので、その特徴は以下の通りである。
（１）湿潤状態の高炉原料に水分吸収剤を添加して混合し、混合した状態で篩い分けを行い、湿潤高炉原料を篩い下粉と、微粉除去後の高炉行き原料とに分離し、微粉が除去された高炉行き原料である篩い上を高炉に装入することを特徴とする高炉の操業方法。
（２）水分吸収剤として、高分子吸水材を用いることを特徴とする、（１）に記載の高炉の操業方法。
（３）前記水分吸収剤を密閉状態にある貯留タンクから圧力により配管中を気送運搬し、圧力を利用して高炉原料に吹き付け添加することを特徴とする、（１）または（２）に記載の高炉の操業方法。
（４）ベルトコンベア上の高炉原料上に水分吸収剤を添加し、前記ベルトコンベアの乗り継ぎ落差における衝撃を利用して前記高炉原料と前記水分吸収剤とを混合することを特徴とする（１）〜（３）のいずれか１に記載の高炉の操業方法。
The present invention has been made based on such findings, and the features thereof are as follows.
(1) adding a water absorbent blast furnace wet mixed, have rows sieved in a mixed state, and separated into a lower powder sieve wet blast furnace raw material, a blast furnace bound material after fines removal, A method for operating a blast furnace, comprising charging a blast furnace with a sieve, which is a raw material for blast furnace, from which fine powder has been removed .
(2) The method for operating a blast furnace according to (1), wherein a polymer water-absorbing material is used as the moisture absorbent.
(3) In the above (1) or (2), the moisture absorbent is transported by air from the storage tank in a sealed state by pressure and sprayed and added to the blast furnace raw material using the pressure. The blast furnace operation method described.
(4) a moisture absorbent was added pressure on blast furnace on the conveyor belt, by utilizing a shock in transit drop of the belt conveyor is characterized in that mixing the water absorbent and the blast furnace raw material (1 ) The operating method of the blast furnace of any one of- (3) .
本発明によれば、従来の篩い設備を用いながら、雨水等にさらされた影響により湿潤状態にある高炉原料の篩い分けが容易に行えるようになる。これにより高炉に装入される微粉原料を十分に抑制する事が可能となり、高炉内の通気性が確保され操業安定性が向上する。 ADVANTAGE OF THE INVENTION According to this invention, the blast furnace raw material in a wet state by the influence exposed to rain water etc. can be easily sieved using the conventional sieving equipment. As a result, it is possible to sufficiently suppress the fine powder material charged into the blast furnace, ensuring air permeability in the blast furnace and improving operational stability.
また、近年高炉操業においてはコークス使用量の削減により高炉炉頂温度が低下し水分が凝集してダスト排出が妨げられ易い状況にあるが、高炉装入原料の水分含有量が減少すると原料の乾燥に必要な熱量が少なくなるため、炉頂部において必要な温度（１００℃以上）を確保しやすくなり、ダスト排出性能が向上し通気性を確保し易くなるという効果もある。 Also, in recent years in blast furnace operation, due to the reduction of coke consumption, the temperature at the top of the blast furnace has decreased and moisture has agglomerated and dust discharge is likely to be hindered. Therefore, it is easy to ensure the necessary temperature (100 ° C. or higher) at the top of the furnace, improving the dust discharge performance and ensuring air permeability.
さらに、従来湿潤原料を篩い分けする際、水分を含んだ篩い下粉がベルト上に付着しベルトコンベアの故障の原因となる事があったが、本発明の方法を用いることで水分が水分吸収剤に補足されるため篩い下粉の付着性が小さくなり、これらのトラブルを回避できるため、生産性も向上する。 In addition, when sieving wet raw materials in the past, water-containing sieving underfloor powder may adhere to the belt and cause a failure of the belt conveyor. By using the method of the present invention, moisture is absorbed by water. Since it is supplemented by the agent, the adhesion of the under-sieving powder is reduced, and these troubles can be avoided, so the productivity is also improved.
本発明では、高炉原料に水分吸収剤を添加して混合し、篩い分けを行うことで、水分の存在により湿潤状態にある高炉原料から水分を除去し、水分架橋による微粉の付着を少なくできる為、従来の篩い設備を用いながら容易に微粉を除去できるようになる。そして、篩い分けにより微粉が除去された高炉原料である篩い上を、高炉に装入して操業を行ない、銑鉄を製造する。本発明は湿潤状態にある全ての高炉原料に対して適用可能であるが、特に水分の付着性が強い鉄鉱石、石炭、コークス、焼結鉱、石灰石等の篩い分けに適用した場合顕著な効果を示す。 In the present invention, the moisture absorbent is added to the blast furnace raw material, mixed, and sifted to remove moisture from the wet blast furnace raw material due to the presence of moisture, thereby reducing adhesion of fine powder due to moisture crosslinking. The fine powder can be easily removed while using the conventional sieving equipment. Then, the top of the sieve, which is the raw material of the blast furnace from which fine powder has been removed by sieving, is charged into the blast furnace and operated to produce pig iron. Although the present invention can be applied to all blast furnace raw materials in a wet state, it is particularly effective when applied to sieving of iron ore, coal, coke, sintered ore, limestone, etc., which have strong moisture adhesion. Indicates.
尚、湿潤状態とは、鉄鉱石等の粒子表面に水分が存在する状態である。鉄鉱石等の原料の含有水分量に対する界面活性剤の効果は、原料の粒子内部の気孔分布により異なるが（対象粒子内部の気孔に水分が吸収された後の粒子表面の水分が問題となるため）、原料の水分含有量が５ｍａｓｓ％以上の場合に効果が大きい。 The wet state is a state in which moisture exists on the surface of particles such as iron ore. The effect of surfactants on the moisture content of raw materials such as iron ore varies depending on the pore distribution inside the raw material particles (because the moisture on the particle surface after the moisture is absorbed by the pores inside the target particles becomes a problem) ), The effect is large when the water content of the raw material is 5 mass% or more.
本発明に用いる水分吸収剤としては、水分吸収速度が非常に早く、また水分吸収後に分子構造内に水分を捕獲する事により粘着性を示さない物質が望ましい。これらの物質の一例としてシリカゲルや各種高分子吸水剤が挙げられるが、特に高分子吸水剤は自重の数百倍以上の水分を取り込む事が可能であり、また水分吸収速度も格段に速いため、より適している。従って、水分吸水剤としては、高分子吸水剤を用いることが特に好ましい。また、ゼオライト、活性炭を用いることも特に好ましい。 As the water absorbent used in the present invention, a substance that has a very high water absorption rate and does not exhibit adhesiveness by trapping water in the molecular structure after water absorption is desirable. Examples of these substances include silica gel and various polymer water-absorbing agents, but especially the polymer water-absorbing agent can take in water several hundred times more than its own weight, and the water absorption rate is remarkably fast, More suitable. Therefore, it is particularly preferable to use a polymer water-absorbing agent as the water-absorbing agent. It is also particularly preferable to use zeolite or activated carbon.
水分吸水剤の高炉原料への添加方法としては、ヤード上で添加し重機で混合する方法、もしくはベルトコンベア上で高炉原料上に添加し、ベルトコンベアの乗り継ぎシュートにおける落下衝撃を利用して混合する方法などがあるが、混合効果が十分であれば後者の方法がより低コストであるため望ましい。また、ベルトコンベア上で水分吸収剤を添加する位置は、篩いからなるべく離れていることが好ましく、原料ヤード側に近い位置とすることが望ましい。これは乗り継ぎ落差をより多く通過し、より多くの時間をかけて搬送されたほうが、水分吸水剤が対象物全体に行き渡りやすくなり、また吸水に必要な時間をより多く確保する事が可能となるためである。 As a method of adding water-absorbing agent to the blast furnace raw material, it is added on the yard and mixed with heavy equipment, or added to the blast furnace raw material on the belt conveyor, and mixed using the drop impact on the belt conveyor transfer chute. There is a method, but if the mixing effect is sufficient, the latter method is desirable because the cost is lower. Further, the position where the moisture absorbent is added on the belt conveyor is preferably as far as possible from the sieve, and is preferably close to the raw material yard side. This means that it is easier for the water-absorbing agent to reach the entire object and more time is required for water absorption if it passes through the connecting head more and is transported for more time. Because.
さらに、水分吸水剤を高炉原料に添加する際の水分吸水剤の切り出し方法としては、振動フィーダーによる切り出しなど、各種粉体定量切出し方法を適用可能であるが、水分吸収剤は空気中の水分を取り込み、劣化もしくは凝結する可能性があるため、高炉原料への添加直前まで外気と遮断された密閉状態にある事が望ましい。よって以上の観点から、密閉状態にある貯留タンクから圧力により配管中を気送運搬し、圧力を利用して高炉原料に吹き付ける手法が最も適している。水分吸収剤を添加、混合後、従来の篩い設備にて篩い分けをおこなうが、篩い設備は従来と同様の運転条件で操業可能であり、特別な操作を必要としない。 Furthermore, as a method for cutting out the water absorbing agent when adding the water absorbing agent to the blast furnace raw material, various powder quantitative cutting methods such as cutting with a vibration feeder can be applied, but the water absorbing agent removes moisture in the air. Since it may be taken in, deteriorated, or condensed, it is desirable to be in a sealed state that is shut off from the outside air until just before addition to the blast furnace raw material. Therefore, from the above viewpoint, a method is most suitable in which the inside of the piping is pneumatically conveyed by pressure from the storage tank in a sealed state and sprayed onto the blast furnace raw material using the pressure. After adding and mixing the moisture absorbent, sieving is carried out with a conventional sieving equipment, but the sieving equipment can be operated under the same operating conditions as before and does not require any special operation.
図１は、本発明の一実施形態を示すフロー図である。微粉が付着した湿潤高炉原料１を高炉の原料として用いる際に、密閉状態にある貯留タンク内の水分吸収剤２を、気送ライン３により湿潤高炉原料１に上部から吹き付けて添加する。水分吸収剤２を添加された湿潤高炉原料１をベルトコンベア４で搬送し、ベルトコンベア４の乗り継ぎシュート部分４ａで落下する際に、水分吸収剤と湿潤高炉原料とが混合される。この状態で湿潤高炉原料１を、従来高炉装入前の原料の篩い分けに用いている篩い設備５を用いて篩い分けを行うことで、湿潤高炉原料１は篩い下粉６と微粉除去後の高炉行き原料７とに分離され、高炉行き原料７を高炉に装入することで、微粉の割合の少ない原料を高炉に装入することが可能となる。
FIG. 1 is a flowchart showing an embodiment of the present invention. When the wet blast furnace raw material 1 to which fine powder is adhered is used as the raw material for the blast furnace, the moisture absorbent 2 in the storage tank in a sealed state is sprayed and added to the wet blast furnace raw material 1 from the upper portion by an
本発明による効果を確認する為に、以下の条件で篩い分け試験を行った。 In order to confirm the effect of the present invention, a sieving test was conducted under the following conditions.
１、水分による粉付着性が高い鉄鉱石を用意し、幅２ｍ、長さ３．５ｍ、目開き７ｍｍの振動篩いに約５Ｔを供して篩い分けを行った。鉄鉱石の含有水分量を乾燥法で測定したところ、３．９ｍａｓｓ％であった。 1. Iron ore with high powder adhesion due to moisture was prepared, and sieved by applying about 5T to a vibrating sieve having a width of 2 m, a length of 3.5 m, and a mesh opening of 7 mm. It was 3.9 mass% when the moisture content of the iron ore was measured by the drying method.
２、上記１と同じ鉄鉱石に水分を散水した後、ショベルを用いてよく混合し、水分をなじませる為に数時間静置して湿潤状態とした。ここで再び鉄鉱石の水分含有量を乾燥法で測定したところ、９．３ｍａｓｓ％となった。この湿潤鉄鉱石を前述の振動ふるいに約５Ｔ供し、篩い分けを行った。 2. After water was sprinkled on the same iron ore as in 1 above, it was mixed well using an excavator and allowed to stand for several hours in order to allow the water to blend into a wet state. Here, when the water content of the iron ore was measured again by the drying method, it was 9.3 mass%. The wet iron ore was subjected to about 5 T on the above-mentioned vibrating screen and sieved.
３、散水した上記ｂと同じ湿潤鉄鉱石にポリアクリル酸系の高分子吸水材を鉄鉱石に対して０．２５ｍａｓｓ％添加し、ショベルを用いてよく攪拌した後、約５Ｔを上述の振動ふるいに供して篩い分け試験を行った。 3. After adding 0.25 mass% of a polyacrylic polymer water-absorbing material to the same wet iron ore as the above-mentioned b and sprinkling water, and stirring well using an excavator, about 5T is added to the above vibration sieve. And subjected to a sieving test.
以上の１〜３の篩い分け後の「篩い下質量比率」と、「篩い下粒径５ｍｍ以下（−５ｍｍ）回収率」の測定結果を表２に示す。 Table 2 shows the measurement results of “mass ratio under sieving” after sieving 1 to 3 and “recovery rate under particle size of 5 mm or less (−5 mm)”.
鉄鉱石に水分を添加した湿潤鉄鉱石を篩い分けすると、篩い下質量比率（篩い下質量÷篩い供給質量×１００）が大幅に低下した。そこで、篩い下−５ｍｍ回収率（篩い下−５ｍｍ質量÷篩い供給−５mm質量×１００）を計算すると、同様に回収率が大幅に低下しており、−５ｍｍ粉が大量に篩い上試料に付着している事が確認された。さらに、高分子吸水材を添加混合した条件においては、湿潤鉄鉱石のみの場合と比較して篩い下質量比率が大幅に増加した。篩い下−５ｍｍ回収率も水分添加前に近いレベルまで回復しており、高分子吸収剤により付着粉が篩い落とされる効果が確認さされた。 When the wet iron ore obtained by adding moisture to the iron ore is sieved, the mass ratio under sieve (mass under sieve ÷ mass of sieve feed × 100) is greatly reduced. Therefore, when the sieving -5 mm recovery rate (under sieving -5 mm mass ÷ sieving supply -5 mm mass x 100) is calculated, the recovery rate is also greatly reduced, and a large amount of -5 mm powder adheres to the sieving sample. It was confirmed that Further, under the condition where the polymer water-absorbing material was added and mixed, the mass ratio under the sieve was greatly increased as compared with the case of only the wet iron ore. The sieving -5 mm recovery was also recovered to a level close to that before the addition of water, and the effect of sieving the adhering powder by the polymer absorbent was confirmed.
１ 湿潤高炉原料
２ 水分吸収剤
３ 気送ライン
４ ベルトコンベア
４ａ 乗り継ぎシュート部分
５ 篩い設備
６ 篩い下粉
７ 高炉行き原料
DESCRIPTION OF SYMBOLS 1 Wet blast furnace raw material 2 Moisture-absorbing
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