JP2008189970A - Method for producing granulated substance for metallurgical raw material - Google Patents

Method for producing granulated substance for metallurgical raw material Download PDF

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JP2008189970A
JP2008189970A JP2007024189A JP2007024189A JP2008189970A JP 2008189970 A JP2008189970 A JP 2008189970A JP 2007024189 A JP2007024189 A JP 2007024189A JP 2007024189 A JP2007024189 A JP 2007024189A JP 2008189970 A JP2008189970 A JP 2008189970A
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sludge
mass
raw material
moisture
dust
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JP5103919B2 (en
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Natsuo Ishiwatari
夏生 石渡
Hiroyuki Hirohane
弘行 広羽
Yoshiaki Hara
義明 原
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JFE Steel Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a granulated substance for a metallurgical raw material, which can easily pulverize the granulated substance, can also reduce a load in drying, and is effective for suppressing the production cost of the granulated substance. <P>SOLUTION: The method for producing the granulated substance for the metallurgical raw material comprises the steps of: firstly mixing carbon-containing wet dust having high humidity and/or sludge with a metal-oxide-containing raw material having lower humidity than the wet dust; subsequently pulverizing the mixture; and then agglomerating it. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、冶金原料用造粒物の製造方法に関し、とくに回転炉床炉もしくはシャフト炉等の冶金炉にて還元金属を製造するときの原料となる造粒物を製造する方法に関する。   The present invention relates to a method for producing a granulated material for a metallurgical raw material, and more particularly to a method for producing a granulated material as a raw material when producing a reduced metal in a metallurgical furnace such as a rotary hearth furnace or a shaft furnace.

製鉄所等では、大量のダストやスラッジが発生する。このダストやスラッジは、ＦｅやＣｒ、Ｚｎなどの有用な金属、それらの酸化物や水酸化物を含有すると共に、炭素分である固体還元材をも含有しており、有用な資源の１つである。   A large amount of dust and sludge is generated at steelworks and the like. This dust and sludge contains useful metals such as Fe, Cr and Zn, oxides and hydroxides thereof, and also contains a solid reducing material which is carbon, and is one of useful resources. It is.

このようなダストやスラッジからは、これらを加熱することによって、脱水ならびに還元反応を経て、各種の有用な金属の回収ができる。その回収技術としては、非特許文献1に記載されているような方法が知られている。この方法は、前記のダストやスラッジを、回転炉床炉やシャフト炉などで加熱、還元することにより、鉄などの蒸気圧の低い金属は固体のまま、亜鉛や鉛など蒸気圧の高い金属は蒸気もしくはヒューム状のダストとして、回収する方法である。
「新日鉄技報」（２００２年３月、第２５ページ） From these dusts and sludges, various useful metals can be recovered through dehydration and reduction reactions by heating them. As the recovery technique, a method as described in Non-Patent Document 1 is known. In this method, the dust and sludge are heated and reduced in a rotary hearth furnace or shaft furnace, so that metals with low vapor pressure such as iron remain solid, while metals with high vapor pressure such as zinc and lead are not solid. It is a method of collecting as vapor or fume-like dust.
"Nippon Steel Technical Report" (March 2002, page 25)

前記回転炉床炉やシャフト炉に装入される原料は、一部を除いて造粒物を用いるのが普通である。冶金用原料となるその造粒物は、炉内での還元反応をよくするためには、ダストおよびスラッジの場合、被還元酸素量を分母とし、炭素量の物質量を分子としたときの炭素分比率を、０．６〜１．２程度に制御することが有効であると言われている。   The raw material charged into the rotary hearth furnace or shaft furnace is usually a granulated product except for a part. In order to improve the reduction reaction in the furnace, the granulated material used as the raw material for metallurgy, in the case of dust and sludge, is carbon when the amount of oxygen to be reduced is the denominator and the amount of carbon is the numerator. It is said that it is effective to control the fraction ratio to about 0.6 to 1.2.

一般に、ダストやスラッジは、炭素分の含有率が高く、前記炭素分比率が１．２を超えている。そこで従来、このダスト、スラッジを使う場合、被還元酸素分を多く含む鉄鉱石やミルスケールなどを共に配合して、前記炭素分比率を低下させる処理を行うのが普通である。   In general, dust and sludge have a high carbon content, and the carbon content ratio exceeds 1.2. Therefore, conventionally, when using this dust and sludge, it is common to mix the iron ore containing a large amount of oxygen to be reduced, the mill scale, etc., and reduce the carbon content ratio.

かかる造粒物を製造する方法としては、従来、ブリケッティングもしくはペレタイジングが一般的であり、その粒径は５ｍｍ以下の小粒径で不均一なものが望ましい。しかし、例えば、鉄鉱石、とくに焼結鉱用の鉄鉱石は、比較的粒度が粗く、粉砕しなければ、適切な粒度および粒度分布のものにすることができない。   Conventionally, briquetting or pelletizing is generally used as a method for producing such a granulated product, and the particle size is preferably a small particle size of 5 mm or less and non-uniform. However, for example, iron ore, particularly iron ore for sintered ore, is relatively coarse in particle size and cannot be made suitable particle size and particle size distribution unless pulverized.

ところが、こうした鉄鉱石などは硬度が高く、ミルを使用して粉砕する場合、損耗がはげしく、ミルの交換を頻繁に行わなければならず、コストの増大を招くので、この問題の解決が求められている。   However, such iron ore has high hardness, and when it is pulverized using a mill, it is worn out and the mill must be replaced frequently, resulting in an increase in cost. ing.

また、湿式処理されたダスト、即ち、湿ダストやスラッジは、湿分（水分）が多いのが普通である。しかし、冶金炉用原料としては、約１０ｍａｓｓ％未満の水分量にした方が造粒性に優れることが知られている。また、水分を低下することで、冶金炉の燃料原単位を低下することも知られている。そのため、この湿ダストやスラッジを使う場合、従来、乾燥をすることが多いが、この湿ダストやスラッジはそもそも付着性が高く、特に乾燥機中においてはこれらが機内壁面に付着して、操業障害を招くことが多い。従って、湿ダストやスラッジを冶金原料とするには、乾燥機への付着を抑えることのできる乾燥方法の開発が求められている。   Also, wet-processed dust, that is, wet dust and sludge, usually has a high moisture content (moisture). However, as a raw material for metallurgical furnaces, it is known that when the water content is less than about 10 mass%, the granulation property is excellent. It is also known to reduce the fuel consumption rate of a metallurgical furnace by reducing moisture. Therefore, when this wet dust or sludge is used, it is often dried in the past, but this wet dust and sludge is highly adherent in the first place, especially in the dryer, they adhere to the inner wall of the machine, causing operational problems. Is often invited. Therefore, in order to use wet dust or sludge as a metallurgical raw material, development of a drying method capable of suppressing adhesion to a dryer is required.

そこで、本発明の目的は、粉砕が容易にできると共に乾燥の負荷を少なくすることができ、造粒物製造コストを抑制するのに有効な冶金原料用造粒物の製造方法を提案することにある。   Therefore, an object of the present invention is to propose a method for producing a granulated product for metallurgical raw materials that can be easily pulverized and can reduce the load of drying, and is effective in suppressing the cost of producing the granulated product. is there.

上記目的を実現する手段として、本発明は、高湿分を有する炭素含有湿ダストおよび／またはスラッジと、それより湿分が低い金属酸化物含有原料とをまず混合し、次いで、粉砕処理し、その後、塊成化処理することを特徴とする冶金原料用造粒物の製造方法を提案する。   As a means for realizing the above object, the present invention first mixes a carbon-containing wet dust and / or sludge having a high moisture content with a metal oxide-containing raw material having a lower moisture content, and then pulverizes it. Then, the manufacturing method of the granulated material for metallurgical raw materials characterized by carrying out the agglomeration process is proposed.

本発明において、前記金属酸化物含有原料が、鉄鉱石、焼結鉱粉またはミルスケールのいずれか１種以上であること、前記粉砕は乾燥しながら行うこと、前記湿ダストおよび／またはスラッジは、水分が１０ｍａｓｓ％以上のもの、より好ましくは２５ｍａｓｓ％以上のものを用いることが、そして、前記金属酸化物含有原料は、水分が１０ｍａｓｓ％未満のものを用いることが、好ましい解決手段である。   In the present invention, the metal oxide-containing raw material is at least one of iron ore, sintered ore powder, or mill scale, the pulverization is performed while drying, and the wet dust and / or sludge is: It is preferable to use a material having a water content of 10 mass% or more, more preferably a material having a water content of 25 mass% or more, and that the metal oxide-containing raw material has a water content of less than 10 mass%.

上述したように、本発明によれば、混合原料の粉砕前の段階で、低湿分の鉄鉱石等の金属酸化物含有原料に対して予め、高湿分のダストやスラッジを混合しておくので、粉砕の負荷が軽くなる。また、本発明によれば、その粉砕と同時に乾燥を行うので、低湿分の鉄鉱石等が高湿分のダスト・スラッジによる乾燥障害（付着）を緩和して乾燥処理が容易にないり、ひいては造粒物製造コストを低下させる。   As described above, according to the present invention, high-humidity dust and sludge are mixed in advance with a metal oxide-containing raw material such as low-humidity iron ore in the stage before pulverization of the mixed raw material. , The load of crushing is lightened. Further, according to the present invention, drying is performed simultaneously with the pulverization, so that low-humidity iron ore and the like alleviate drying trouble (adhesion) due to high-humidity dust and sludge, and the drying process is not easy. Reduce granule manufacturing cost.

本発明の考え方の特徴をまとめると以下のとおりである。まず、本発明において重要な役割を担う湿ダストやスラッジは、その中に平均５ｍａｓｓ％〜５０ｍａｓｓ％程度の炭素分、多くのものは平均２０ｍａｓｓ％〜３０ｍａｓｓ％を含み高湿分（≧１０ｍａｓｓ％）であるのが特徴である。この炭素分は、コークスや石炭、油分などに由来する固体還元材であり、これらは鉄鉱石などと比べると、硬度が著しく低い。従って、金属酸化物含有原料である鉄鉱石を粉砕する前に、炭素を含有するために硬度が低い湿ダストやスラッジを予め混合し、その後、その混合物を粉砕するようにすれば、これら湿ダストやスラッジが鉄鉱石よりも先に粉砕され、その粉が鉄鉱石とミル表面との間に入って緩衝し、ミル壁の摩耗を防止する。   The features of the concept of the present invention are summarized as follows. First, wet dust and sludge, which play an important role in the present invention, have an average carbon content of about 5 mass% to 50 mass%, many of which contain an average of 20 mass% to 30 mass%, and a high humidity (≧ 10 mass%). It is a feature. This carbon content is a solid reducing material derived from coke, coal, oil, etc., and these have remarkably low hardness compared to iron ore and the like. Therefore, before pulverizing the iron ore that is a metal oxide-containing raw material, if wet dust or sludge having low hardness to contain carbon is mixed in advance, and then the mixture is pulverized, then these wet dust And sludge are crushed before iron ore, and the powder enters between the iron ore and the mill surface to buffer and prevent wear of the mill wall.

このような作用効果は、硬度の高い金属酸化物含有原料であればどのような原料に対しても有効であるが、製鉄原料の中では特に、鉄鉱石、焼結鉱、ミルスケールなどに対して、効果を発揮する。   Such an effect is effective for any raw material containing metal oxide with high hardness, but among iron making raw materials, iron ore, sintered ore, mill scale, etc. And show the effect.

一方で、本発明では、このように予混合したあと粉砕処理するが、このとき、乾燥を同時に行ってもよい。このような粉砕・乾燥の同時処理の場合、新たな効果も発揮する。それは、鉄鉱石などの金属酸化物原料は、湿ダストやスラッジと比較して水分量が少なく（＜１０ｍａｓｓ％）、付着性（親水性）が低いことに起因する。この付着性の低い鉄鉱石などの金属酸化物含有原料が、高湿分で付着性の高い湿ダストやスラッジと乾燥機内壁面との間に流れ込み、高湿分の湿ダストやスラッジが乾燥機内壁面に付着するのを効果的に防止する作用を発揮するからである。   On the other hand, in the present invention, the pulverization is performed after premixing as described above, and at this time, drying may be performed simultaneously. In the case of such simultaneous processing of pulverization and drying, a new effect is also exhibited. This is because metal oxide raw materials such as iron ore have a lower moisture content (<10 mass%) and lower adhesion (hydrophilicity) than wet dust and sludge. This metal oxide-containing raw material such as iron ore with low adhesion flows between moist dust and sludge with high moisture and high adhesion, and the inner wall surface of the dryer. It is because the effect | action which prevents effectively adhering to is exhibited.

このような作用効果は、粉砕、乾燥工程の全般において生ずるが、低湿分（＜１０ｍａｓｓ％）の鉄鉱石等に対し、高湿分（≧１０ｍａｓｓ％）のダスト・スラッジの組み合わせのときに顕著であり、特にダスト・スラッジの水分が２５ｍａｓｓ％以上の湿ダストやスラッジを混合する場合において効果が高い。   Such an effect occurs in the entire pulverization and drying process, but is remarkable when a combination of high humidity (≧ 10 mass%) dust and sludge with low-humidity (<10 mass%) iron ore and the like. In particular, the effect is high when wet dust or sludge having a dust sludge moisture content of 25 mass% or more is mixed.

以下、上述した本発明方法の作用効果を検証するために、図1（従来方法）および図２（発明方法）の小型設備を組み立てて造粒を行い、ミルの損耗量や乾燥機内壁面への原料の付着量を測定し比較する実験を行った。なお、両設備とも、造粒物製造量１トン／時間で鉄鉱石と湿ダスト・スラッジの混合比率は３：７である。   In order to verify the operational effects of the above-described method of the present invention, the small equipment shown in FIG. 1 (conventional method) and FIG. 2 (invention method) is assembled and granulated, and the amount of wear on the mill and the inner wall of the dryer are reduced. An experiment was conducted to measure and compare the adhesion amount of the raw material. In both facilities, the granule production rate is 1 ton / hour, and the mixing ratio of iron ore and wet dust / sludge is 3: 7.

（１）従来方法の説明
この方法は、図１に示す造粒設備を用いて造粒した例である。図示した設備について、マテリアルフローに従って説明する。
ダストおよびスラッジは、ダスト・スラッジ受け入れ装置１にて受け入れする。この装置は、開放型のホッパと切り出し装置からなり、そのホッパ内にはダスト・スラッジをショベルもしくはダンプカーなどにより投入する。この場合、スラッジは水分が多く、壁面と付着しやすいので、ノッカーなどの付着防止装置を備えたり、表面が平滑なステンレス鋼で製作したものでもよい。切り出し装置としては、スクリューフィーダ、ベルトフィーダーなどを使用する。 (1) Description of Conventional Method This method is an example of granulation using the granulation equipment shown in FIG. The illustrated equipment will be described according to the material flow.
Dust and sludge are received by the dust sludge receiving device 1. This device is composed of an open hopper and a cutting device, and dust and sludge are put into the hopper by an excavator or a dump truck. In this case, since the sludge has a high water content and easily adheres to the wall surface, the sludge may be provided with an adhesion prevention device such as a knocker or may be made of stainless steel having a smooth surface. As the cutting device, a screw feeder, a belt feeder or the like is used.

このようにして受け入れたダスト・スラッジは、それぞれ定量が切り出されて、乾燥装置Ｄ１に投入され、個別に乾燥される。この乾燥装置Ｄ１は、熱風炉２、ミル３、燃焼室４、バグフィルタ５などによって構成される。例えば、水分量の多いスラッジは、熱風によって乾燥され、その乾燥時に微粒となったものは熱風に搬送されて、バグフィルタ５に回収される。一方、熱風にて搬送されなかったものは、燃焼室４の底部に設置されているミル３で粉砕され、細粒となり、コンベヤにて、ダスト・スラッジホッパ６に搬送される。 Dust sludge received in this way are each cut out quantitative, is turned to the drying device D 1, are dried separately. The drying apparatuses D 1 is a hot air furnace 2, the mill 3, the combustion chamber 4, and the like the bag filter 5. For example, sludge with a large amount of water is dried with hot air, and the fine particles produced during the drying are transported to hot air and collected by the bag filter 5. On the other hand, what is not conveyed by hot air is pulverized by the mill 3 installed at the bottom of the combustion chamber 4 to become fine particles, and is conveyed to the dust / sludge hopper 6 by the conveyor.

なお、従来方法では、鉄鉱石は別ラインに設置されている乾燥機Ｄ２にて同様に乾燥され、鉱石ホッパ７に搬送される。この鉄鉱石は、スラッジに比べて、水分が低い傾向にあるため、例えば、水分が十分に低い（＜１０ｍａｓｓ％、好ましくは≦５ｍａｓｓ％）場合は、熱風炉は不要である。 In the conventional method, the iron ore is similarly dried by the dryer D 2 installed in a separate line and is transported to the ore hopper 7. Since this iron ore tends to have a lower moisture content than sludge, for example, when the moisture is sufficiently low (<10 mass%, preferably ≦ 5 mass%), a hot stove is not necessary.

これらのダスト・スラッジおよび鉄鉱石は、まずホッパ６、７（図示の８はフラックス・バインダホッパである）にて備蓄され、フラックスおよびバインダーと定量に配合されて切り出され、混合機９へ送られる。この混合機９で十分に混合された原料は、次に造粒装置１０へ送られ、造粒物となる。この図では、双ロールタイプのブリケツトマシーンを記載しているが、ぺレタイザーなどであっても効果は変わらない。
なお、図示の１１は、乾燥装置Ｄ１の燃焼室４の内壁面に付着した付着物を示している。 These dust sludge and iron ore are first stored in hoppers 6 and 7 (8 in the figure is a flux binder hopper), mixed with flux and binder in a fixed amount, cut out, and sent to the mixer 9. . The raw material sufficiently mixed by the mixer 9 is then sent to the granulating apparatus 10 to become a granulated product. In this figure, a twin-roll type briquette machine is shown, but the effect does not change even with a pelletizer.
Incidentally, 11 illustrated show the deposits adhering to the inner wall surface of the combustion chamber 4 of the dryer D 1.

（２）本発明方法の説明
図２は、本発明方法で使用する造粒設備の模式図である。この図に示す設備は、図１に示す従来設備と、乾燥装置Ｄ１および混合機９の配置が異なるだけである。即ち、本発明方法を適用する図２の設備は、混合機９が乾燥装置Ｄ１の上流側に配設されているのに対し、従来方法で用いる装置は、乾燥装置Ｄ１、Ｄ２の後工程に混合機９を配置して、それぞれ独立して乾燥した鉄鉱石と湿ダスト、スラッジとを、造粒の前に混合するようになっている点で、際立った相違点がある。 (2) Description of the method of the present invention FIG. 2 is a schematic view of the granulation equipment used in the method of the present invention. The equipment shown in this figure is different from the conventional equipment shown in FIG. 1 only in the arrangement of the drying device D 1 and the mixer 9. That is, in the equipment of FIG. 2 to which the method of the present invention is applied, the mixer 9 is disposed on the upstream side of the drying device D 1 , whereas the devices used in the conventional method are the drying devices D 1 and D 2 . There is a remarkable difference in that the mixer 9 is arranged in the post-process and the iron ore, wet dust, and sludge that are independently dried are mixed before granulation.

図２に示す本発明方法では、ダスト・スラッジ受け入れ装置１および鉱石受け入れ装置１２と混合機９を直接つなぎ、湿ダストやスラッジが高水分のまま鉄鉱石やフラックスと混合される。高水分の湿ダストやスラッジを混合することは、一般に難しいと考えられるが、例えば、高速攪拌ミキサーやアイリッヒミキサーなどを用いて、攪拌を強化することで、混合が可能である。また、乾燥粉の搬送コンベアー間にも混合機を配置しておき予め、フラックスやバインダーを添加して予混合することも有効である。
このように混合機９において混合された湿ダスト、スラッジと鉱石等との混合粉は、従来方法と同様に造粒機１０にて造粒処理される。 In the method of the present invention shown in FIG. 2, the dust / sludge receiving device 1 and the ore receiving device 12 and the mixer 9 are directly connected, and the wet dust and sludge are mixed with the iron ore and the flux with high moisture. It is generally considered difficult to mix high-moisture wet dust or sludge, but for example, mixing can be performed by enhancing stirring using a high-speed stirring mixer or Eirich mixer. It is also effective to place a mixer between the dry powder conveyors and add a flux or a binder in advance to perform premixing.
Thus, the mixed powder of wet dust, sludge, ore, etc. mixed in the mixer 9 is granulated by the granulator 10 as in the conventional method.

（３）この実験において使用した混合原料
表1に使用した鉄鉱石、ダストスラッジ（高炉、転炉等で発生したダストを湿式集塵してスラッジ状になったもの）の組成を示す。このダストスラッジは、高炉系のスラッジであり、リングスリットウォッシャー（ＲＳＷ）で湿式除塵されたものをフィルタープレスで水分を除去したものであり、本発明において湿ダストといい、単にスラッジとも言うものである。このダストスラッジの水分濃度は、圧さく圧力や滞留時間などによって１０ｍａｓｓ％−３５ｍａｓｓ％に変化する。また、鉄鉱石の水分もヤードに積み上げられて以後の天候により、１０ｍａｓｓ％〜５ｍａｓｓ％の間で変化する。 (3) Mixed raw materials used in this experiment Table 1 shows the composition of iron ore and dust sludge (wet dust collected in a blast furnace, converter, etc. to form a sludge). This dust sludge is a blast furnace sludge, which is obtained by removing moisture with a filter press after wet removal by a ring slit washer (RSW). is there. The moisture concentration of the dust sludge changes from 10 mass% to 35 mass% depending on the pressing pressure and the residence time. Moreover, the moisture of iron ore is also piled up in the yard and varies between 10 mass% and 5 mass% depending on the weather after that.

Figure 2008189970
Figure 2008189970

（４）性能評価
性能の評価はミルの損耗量と乾燥機内付着物の低減量で行った。
ａ．ミルの損耗量
ミルの損耗量は新品ミルの重量と１週間使用した後にミルを回収し、清掃を行った上で測った使用後のミルの重量との差を新品ミルの重量で割ったものを損耗量とした。発明方法では、使用するミルが１基であるのに対し、従来方法では、使用するミルが２基であるため、全てのミルを同一スペックにして使用することとし、それぞれのミルの損耗量を合計量で示した。ただし、本発明法３〜６については、付着量を測定するために行った操業であるため、損耗量は測定しなかった。 (4) Performance evaluation The performance was evaluated based on the amount of wear of the mill and the amount of deposits in the dryer.
a. The amount of wear on the mill The amount of wear on the mill is the difference between the weight of the new mill and the weight of the mill after use after one week of use, after the mill has been collected and cleaned. Was the amount of wear. In the method of the invention, only one mill is used, whereas in the conventional method, since two mills are used, all the mills are used with the same specifications. Shown in total amount. However, about this invention method 3-6, since it was the operation performed in order to measure the adhesion amount, the amount of wear was not measured.

ｂ．乾燥機内付着量
乾燥構内の付着量は一週間操業した後に機内に付着している量を測定した。乾燥機内の体積は１５ｍ３である。発明方法で使用する乾燥機が１基であるのに対して、従来方法では使用する乾燥機が２基であるため、それぞれの乾燥榛の付着量と合計量を示した。 b. Amount of adhesion in the dryer The amount of adhesion in the dry yard was measured after one week of operation. The volume in the dryer is 15 m 3 . Since the number of dryers used in the method of the invention is one, whereas the number of dryers used in the conventional method is two, the attached amount and the total amount of each dry soot are shown.

ｃ．実験操業の詳細
操業結果を表２に示す。各条件は以下の通りである。
従来方法１：図１の設備を使用し、鉄鉱石水分５ｍａｓｓ％、スラッジ水分１０ｍａｓｓ％で乾燥機無しで製造した場合、
従来方法２：図１の設備を使用し、鉄鉱石水分１０ｍａｓｓ％、スラッジ水分１８ｍａｓｓ％で製造した場合、
従来方法３：図１の設備を使用し、鉄鉱石水分1０ｍａｓｓ％、スラッジ水分２２ｍａｓｓ％で製造した場合、
従来方法４：図１の設備を使用し、鉄鉱石水分1０ｍａｓｓ％、スラッジ水分２５ｍａｓｓ％で製造した場合、
従来方法５：図１の設備を使用し、鉄鉱石水分1０ｍａｓｓ％、スラッジ水分２８ｍａｓｓ％で製造した場合、
従来方法６：図１の設備を使用し、鉄鉱石水分1０ｍａｓｓ％、スラッジ水分３２ｍａｓｓ％で製造した場合、
本発明方法１：図２の設備を使用し、鉄鉱石水分５ｍａｓｓ％、スラッジ水分１０ｍａｓｓ％で乾燥機無しで製造した場合、
本発明方法２：図２の設備を使用し、鉄鉱石水分1０ｍａｓｓ％、スラッジ水分１８ｍａｓｓ％で製造した場合、
本発明方法３：図２の設備を使用し、鉄鉱石水分1０ｍａｓｓ％、スラッジ水分２２ｍａｓｓ％で製造した場合、
本発明方法４：図２の設備を使用し、鉄鉱石水分1０ｍａｓｓ％、スラッジ水分２５ｍａｓｓ％で製造した場合、
本発明方法５：図２の設備を使用し、鉄鉱石水分1０ｍａｓｓ％、スラッジ水分２８ｍａｓｓ％で製造した場合、
本発明方法６：図２の設備を使用し、鉄鉱石水分1０ｍａｓｓ％、スラッジ水分３２ｍａｓｓ％で製造した場合、 c. Details of the experimental operation Table 2 shows the operation results. Each condition is as follows.
Conventional method 1: When the equipment shown in FIG. 1 is used and the iron ore moisture is 5 mass% and the sludge moisture is 10 mass% and is manufactured without a dryer.
Conventional method 2: When the equipment of FIG. 1 is used and the iron ore moisture is 10 mass% and the sludge moisture is 18 mass%,
Conventional method 3: When the equipment shown in FIG. 1 is used and the iron ore moisture is 10 mass% and the sludge moisture is 22 mass%,
Conventional method 4: When the equipment of FIG. 1 is used and the iron ore moisture is 10 mass% and the sludge moisture is 25 mass%,
Conventional method 5: When the equipment of FIG. 1 is used and the iron ore moisture is 10 mass% and the sludge moisture is 28 mass%,
Conventional method 6: When the equipment of FIG. 1 is used and the iron ore moisture is 10 mass% and the sludge moisture is 32 mass%,
Method 1 of the present invention: When the equipment of FIG.
Method 2 of the present invention: When the equipment shown in FIG. 2 is used and the iron ore moisture is 10 mass% and the sludge moisture is 18 mass%,
Method 3 of the present invention: When the equipment shown in FIG. 2 is used and the iron ore moisture is 10 mass% and the sludge moisture is 22 mass%,
Method 4 of the present invention: When the equipment shown in FIG. 2 is used and the iron ore moisture is 10 mass% and the sludge moisture is 25 mass%,
Method 5 of the present invention: When the equipment shown in FIG. 2 is used and the iron ore moisture is 10 mass% and the sludge moisture is 28 mass%,
Method 6 of the present invention: When the equipment shown in FIG. 2 is used and the iron ore moisture is 10 mass% and the sludge moisture is 32 mass%,

Figure 2008189970
Figure 2008189970

発明方法１、２および従来方法１、２を比較するとわかるように、本発明方法を使用することにより、損耗量が大幅に低下した。この効果は乾燥あり／なしともに同様の効果を示した。   As can be seen by comparing the inventive methods 1 and 2 and the conventional methods 1 and 2, the amount of wear was significantly reduced by using the method of the present invention. This effect showed the same effect with and without drying.

図３は、処理前原料の平均水分量と付着量との関係を示した。この図に示すように、平均水分量が増加すると付着量は増加することがわかる。特に、従来方法ではスラッジ水分２５ｍａｓｓ％を超えると、急激に付着量が増加するのに対して、発明方法では増加傾向に大きな変化が見られなかった。つまり、発明方法は、水分量２５ｍａｓｓ％以上で、急激に付着量が増加するのを防ぐ効果があることがわかった。   FIG. 3 shows the relationship between the average moisture content of the raw material before treatment and the adhesion amount. As shown in this figure, it can be seen that the amount of adhesion increases as the average water content increases. In particular, in the conventional method, when the sludge moisture exceeds 25 mass%, the amount of adhesion increases rapidly, whereas in the inventive method, there has been no significant change in the increasing tendency. That is, it has been found that the inventive method has an effect of preventing the adhesion amount from rapidly increasing when the water content is 25 mass% or more.

本発明の技術は、回転炉床炉やシャフト炉の原料となる還元鉄を製造するときに用いられる原料を提供する場合の他、他の冶金炉などの原料としても使用される造粒物の製造技術として利用できる。   The technique of the present invention provides a raw material used when producing reduced iron as a raw material for a rotary hearth furnace and a shaft furnace, as well as a granulated material used as a raw material for other metallurgical furnaces. It can be used as a manufacturing technology.

従来方法の設備構成図である。It is an equipment block diagram of the conventional method. 発明方法の設備構成国である。The country of equipment configuration of the inventive method. 処理前原料の平均水分量と付着量の関係を示すグラフである。It is a graph which shows the relationship between the average moisture content of the raw material before a process, and the adhesion amount.

符号の説明Explanation of symbols

１ ダスト・スラッジ受け入れ装置
２ 熱風炉
３）ミル
４ 燃焼室
５ バグフィルタ
６ ダスト・スラッジホッパ
７ 鉱石ホッパ
９ フラックス、バインダホッパ
９ 混合機
１０ 造粒機
１１ 付着物
１２ 鉱石受け入れホッパ
Ｄ１、Ｄ２ 乾燥装置 DESCRIPTION OF SYMBOLS 1 Dust / sludge receiving device 2 Hot air furnace 3) Mill 4 Combustion chamber 5 Bag filter 6 Dust / sludge hopper 7 Ore hopper 9 Flux, binder hopper 9 Mixer 10 Granulator 11 Deposit 12 Ore receiving hopper D 1 , D 2 Drying equipment

Claims (6)

高湿分を有する炭素含有湿ダストおよび／またはスラッジと、それより湿分が低い金属酸化物含有原料とをまず混合し、次いで、粉砕処理し、その後、塊成化処理することを特徴とする冶金原料用造粒物の製造方法。 A carbon-containing wet dust and / or sludge having a high moisture content and a metal oxide-containing raw material having a lower moisture content are first mixed, then ground and then agglomerated. Manufacturing method of granulated material for metallurgical raw materials. 前記金属酸化物含有原料が、鉄鉱石、焼結鉱粉またはミルスケールのいずれか１種以上であることを特徴とする請求項１記載の冶金原料用造粒物の製造方法。   The method for producing a granulated product for a metallurgical raw material according to claim 1, wherein the metal oxide-containing raw material is at least one of iron ore, sintered ore powder, and mill scale. 前記粉砕は、乾燥しながら行うことを特徴とする請求項１または２に記載の冶金原料用造粒物の製造方法。   The said pulverization is performed while drying, The manufacturing method of the granulated material for metallurgical raw materials of Claim 1 or 2 characterized by the above-mentioned. 前記湿ダストおよび／またはスラッジは、水分が１０ｍａｓｓ％以上であることを特徴とする請求項１〜３のいずれか１項に記載の冶金原料用造粒物の製造方法。   The said wet dust and / or sludge are 10 mass% or more of water | moisture contents, The manufacturing method of the granulated material for metallurgical raw materials of any one of Claims 1-3 characterized by the above-mentioned. 前記湿ダストおよび／またはスラッジは、水分が２５ｍａｓｓ％以上であることを特徴とする請求項１〜３のいずれか１項に記載の冶金原料用造粒物の製造方法。   The wet dust and / or sludge has a moisture content of 25 mass% or more, and the method for producing a granulated material for metallurgical raw materials according to any one of claims 1 to 3. 前記金属酸化物含有原料は、水分が１０ｍａｓｓ％以下であることを特徴とする請求項１または２に記載の冶金原料用造粒物の製造方法。   The said metal oxide containing raw material is a water | moisture content of 10 mass% or less, The manufacturing method of the granulated material for metallurgical raw materials of Claim 1 or 2 characterized by the above-mentioned.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010168627A (en) * 2009-01-23 2010-08-05 Nippon Yakin Kogyo Co Ltd Method for dehydrating hydrous valuable metal-containing substance using microwave
WO2019188668A1 (en) * 2018-03-29 2019-10-03 Ｊｆｅスチール株式会社 Granulated substance, method for producing granulated article, method for producing sintered ore

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JPS5323804A (en) * 1976-08-18 1978-03-04 Nippon Steel Corp Production of pellet
JPS5521581A (en) * 1978-08-04 1980-02-15 Kobe Steel Ltd Method of manufacturing material for sintered mineral
JPH1112626A (en) * 1997-06-30 1999-01-19 Sumitomo Metal Ind Ltd Production of reduced iron

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5323804A (en) * 1976-08-18 1978-03-04 Nippon Steel Corp Production of pellet
JPS5521581A (en) * 1978-08-04 1980-02-15 Kobe Steel Ltd Method of manufacturing material for sintered mineral
JPH1112626A (en) * 1997-06-30 1999-01-19 Sumitomo Metal Ind Ltd Production of reduced iron

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010168627A (en) * 2009-01-23 2010-08-05 Nippon Yakin Kogyo Co Ltd Method for dehydrating hydrous valuable metal-containing substance using microwave
WO2019188668A1 (en) * 2018-03-29 2019-10-03 Ｊｆｅスチール株式会社 Granulated substance, method for producing granulated article, method for producing sintered ore
CN111918974A (en) * 2018-03-29 2020-11-10 杰富意钢铁株式会社 Granulated substance, method for producing granulated substance, and method for producing sintered ore

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