JP2001348625A - Method for producing pellet for iron-marking raw material - Google Patents
Method for producing pellet for iron-marking raw materialInfo
- Publication number
- JP2001348625A JP2001348625A JP2000171769A JP2000171769A JP2001348625A JP 2001348625 A JP2001348625 A JP 2001348625A JP 2000171769 A JP2000171769 A JP 2000171769A JP 2000171769 A JP2000171769 A JP 2000171769A JP 2001348625 A JP2001348625 A JP 2001348625A
- Authority
- JP
- Japan
- Prior art keywords
- raw material
- iron
- pellets
- starch
- weight
- 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.)
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Classifications
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、製鉄工程で発生す
る主成分が鉄分のダスト、スケール、スラッジや鉄鉱石
粉の利用法に関するもので、これらをペレット化するこ
とで製鉄工程で使用することに関する改善方法である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of using iron dust, scale, sludge and iron ore powder, the main components of which are generated in an iron making process, and relates to the use of these in the iron making process by pelletizing them. It is an improvement method.
【０００２】[0002]
【従来の技術】従来、製鉄工程においては、例えば高炉
・転炉ダストをペレット化し、焼成炉で処理後、製鉄原
料として使用することが行われている。ペレットは、造
粒してから焼成炉までのトラックやコンベアによる運搬
途上でのハンドリングによる崩壊、粉化や、また、焼成
炉に装入する際の崩壊や粉化等に起因する、歩留の低下
や焼成炉の効率低下、周囲の環境を悪化させるような粉
塵の発生を抑えるために、十分な強度を確保することが
必要である。従来、ペレット強度を高めるために、原料
である鉄含有粉にバインダーを混合し、ペレット化する
ことが行われている。例えば、特表昭５６−５０１５７
０では鉱物微粉および澱粉からなる混合物をペレット化
する、また、糊化した澱粉を鉱物微粉に加え、ペレット
化する、としている。2. Description of the Related Art Conventionally, in the iron making process, for example, blast furnace and converter dust is pelletized, processed in a firing furnace, and then used as a raw material for iron making. Pellets are subject to collapse and powdering due to handling during transportation by truck or conveyor from granulation to the firing furnace, and also due to collapsing and powdering when charged into the firing furnace. It is necessary to secure sufficient strength in order to suppress the generation of dust that lowers the efficiency of the firing furnace and lowers the surrounding environment. Conventionally, in order to increase the pellet strength, a binder is mixed with iron-containing powder, which is a raw material, and pelletized. For example, Japanese Patent Publication No. 56-50157
In the case of 0, a mixture of mineral fine powder and starch is pelletized, and gelatinized starch is added to mineral fine powder and pelletized.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、前記の
ペレット製造方法を用いて製鉄工程で発生する鉄含有粉
と石炭を混合してペレットを製造したところ、少量の澱
粉では十分な強度を得る事ができなかった。十分な強度
を得るために多量の澱粉を用いると、バインダーである
澱粉の費用が高価となり、更に造粒での生産性低下及び
焼成工程での効率が低下した。本発明は、このような事
情に鑑みてなされたもので、少量の澱粉を使用して、十
分な強度を有する製鉄原料用ペレットを提供することを
目的とする。However, when the pellets were produced by mixing the iron-containing powder generated in the iron-making process with coal using the above-mentioned pellet production method, it was found that sufficient strength could be obtained with a small amount of starch. could not. If a large amount of starch is used to obtain sufficient strength, the cost of starch as a binder becomes expensive, and further, productivity in granulation is reduced and efficiency in the firing step is reduced. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a pellet for a steelmaking raw material having a sufficient strength by using a small amount of starch.
【０００４】[0004]
【課題を解決するための手段】本発明に係る製造方法の
要旨は、高炉・転炉ダスト、圧延スケール、スラッジ、
鉄鉱石粉等の製鉄工程で発生する鉄含有粉をそれぞれ単
独あるいは混合した原料に、石炭、コークス等の炭材、
澱粉を加えて混合、混練し、さらに造粒機で澱粉溶液を
供給して造粒することを特徴とする製鉄原料の製造方法
である。The gist of the production method according to the present invention is as follows: blast furnace / converter dust, rolling scale, sludge,
Iron ore powder and other iron-containing powders generated in the iron-making process can be used alone or in combination with raw materials such as coal and coke,
A method for producing a raw material for ironmaking, comprising adding starch, mixing and kneading, and further supplying a starch solution with a granulator to granulate.
【０００５】[0005]
【発明の実施の形態】本発明の請求項１記載のペレット
製造方法の作用を確認するため、以下の実験を行った。
最初に本発明方法によって、転炉ダストを６０重量％、
圧延スケールを２５重量％、炭材として無煙炭を１５重
量％配合し、造粒に適した粒度に整えたものを原料と
し、澱粉を該当原料の０〜０．５重量％の間で０．１％
ずつ変化させて混合した後、適当な水分に調整し、この
混合物をボールミルによって十分に混合、混練し、直径
１ｍの皿型造粒機でペレット化した。造粒機では澱粉を
５重量％溶解した水溶液を原料の２重量％連続的に添加
することで、該当原料の０．１重量％の澱粉を溶液状で
供給した。このようにしてペレットに含まれる澱粉の合
計を０．１〜０．６％とした。造粒後のペレット直径は
８〜１２mmで、ペレット含水率は約１０重量％であっ
た。以上のペレット化の処理工程を図１に示す。BEST MODE FOR CARRYING OUT THE INVENTION The following experiment was conducted to confirm the operation of the method for producing pellets according to claim 1 of the present invention.
First, according to the method of the present invention, 60% by weight of converter dust
Rolled scale is 25% by weight, and anthracite is blended as a carbon material in an amount of 15% by weight. The raw material is adjusted to a particle size suitable for granulation. %
After changing the mixture, the water content was adjusted to an appropriate level, and the mixture was sufficiently mixed and kneaded by a ball mill, and pelletized by a dish-type granulator having a diameter of 1 m. In the granulator, an aqueous solution in which 5% by weight of starch was dissolved was continuously added in an amount of 2% by weight of the raw material, so that 0.1% by weight of the corresponding raw material was supplied in the form of starch. Thus, the total amount of starch contained in the pellets was 0.1 to 0.6%. The pellet diameter after granulation was 8 to 12 mm, and the pellet moisture content was about 10% by weight. FIG. 1 shows the above-mentioned pelletizing process.
【０００６】このようにして製造したペレットの圧壊強
度及び落下強度試験を行った。圧壊強度測定結果を図
２、落下強度測定結果を図３に本発明の方法として示
す。次に比較のため、本発明のプロセスで造粒機での澱
粉水溶液供給を止め、転炉ダスト、圧延スケール、無煙
炭を混合した原料に澱粉を当該原料の０．５、１．０重
量％混合してペレットを製造した。このようにして製造
したペレットの圧壊強度及び落下強度試験を行った。圧
壊強度測定結果を図２、落下強度測定結果を図３に比較
の方法として示す。[0006] The crushing strength and drop strength test of the pellets thus produced were performed. FIG. 2 shows the crushing strength measurement results, and FIG. 3 shows the drop strength measurement results as the method of the present invention. Next, for comparison, in the process of the present invention, the supply of the starch aqueous solution in the granulator was stopped, and starch was mixed with a raw material obtained by mixing converter dust, a rolling scale, and anthracite in a ratio of 0.5% and 1.0% by weight of the raw material. To produce pellets. The pellets thus produced were subjected to a crushing strength test and a drop strength test. FIG. 2 shows the crushing strength measurement results, and FIG. 3 shows the drop strength measurement results as a comparison method.
【０００７】また、このようにして製造した本発明のペ
レットと比較の方法で製造した比較ペレットを乾燥装置
の一例であるバンドドライヤーで１６０℃程度の熱風を
送って徐々に乾燥し、ペレット含水率が１％以下になる
まで十分に乾燥した。このように乾燥処理したペレット
の圧壊強度及び落下強度試験を行った。圧壊強度測定結
果を図４、落下強度測定結果を図５に本発明の方法と比
較の方法として示す。The pellets of the present invention thus produced and the comparative pellets produced by the comparative method are gradually dried by blowing hot air at about 160 ° C. with a band dryer, which is an example of a drying apparatus, to obtain a pellet moisture content. Was sufficiently dried until the content became 1% or less. The pellets thus dried were subjected to a crushing strength test and a drop strength test. FIG. 4 shows the crushing strength measurement results, and FIG. 5 shows the drop strength measurement results as a method for comparison with the method of the present invention.
【０００８】ここで圧壊強度とはペレット１個の圧縮破
壊に要する力をいい、落下強度とはペレット１個を所定
の高さから鉄板上に落下させ、ペレットが割れなかった
落下回数をいう。なお、図３の落下強度は１ｍの高さか
らペレットを落下させ、図５の落下強度は４５０mmの高
さからペレットを落下させた結果を示す。[0008] Here, the crushing strength refers to the force required for compressive breaking of one pellet, and the drop strength refers to the number of times that one pellet is dropped from a predetermined height onto an iron plate and the pellet is not broken. The drop strength in FIG. 3 shows the result of dropping the pellet from a height of 1 m, and the drop strength in FIG. 5 shows the result of dropping the pellet from a height of 450 mm.
【０００９】前記試験の結果から、本発明のペレット
は、比較の方法で製造されたペレットよりも少量の澱粉
使用量で十分な強度を有することが判る。なお、本試験
では皿型造粒機でペレット化を行ったが、造粒中に溶液
添加が可能なドラム型造粒機を用いても同様の結果が得
られる。From the above test results, it can be seen that the pellets of the present invention have sufficient strength with a smaller amount of starch used than the pellets produced by the comparative method. In this test, pelletization was performed using a dish-type granulator, but similar results can be obtained by using a drum-type granulator capable of adding a solution during granulation.
【００１０】[0010]
【実施例】本発明の方法によって、転炉ダスト、圧延ス
ケールと石炭を混合して原料とし、さらに、この混合原
料に澱粉を加えて混練、水分調整し、皿型造粒機にてペ
レット化した。造粒機では混合原料に、澱粉を溶解した
水溶液を連続的に添加した。このようにして得られたペ
レットを振動ふるいに導いて適切な範囲の直径のペレッ
トを選択し、選択したペレットを乾燥機にてペレット中
水分が１％以下となるよう乾燥後、焼成炉にて加熱処理
を行なった。EXAMPLE According to the method of the present invention, a converter dust, a rolling scale and coal are mixed to obtain a raw material, and starch is added to the mixed raw material, kneaded, water content is adjusted, and pelletized by a plate granulator. did. In the granulator, an aqueous solution in which starch was dissolved was continuously added to the mixed raw material. The pellets thus obtained are guided to a vibrating sieve to select pellets having a diameter in an appropriate range, and the selected pellets are dried in a drier so that the moisture content in the pellets is 1% or less, and then in a firing furnace. Heat treatment was performed.
【００１１】具体的な、手順と条件は以下の通りであ
る。転炉ダストを６０重量％、圧延スケールを２５重量
％、炭材として無煙炭を１５重量％混合して原料とし、
さらに、この混合原料に澱粉を０．２重量％加えたもの
をミキサーにて十分に混合した後、混合原料水分が８重
量％となるよう調整した。これをボールミルに導き、混
合原料の粒度が１mm以下となるよう粉砕し、十分に混練
後、皿型造粒機にてペレット化した。造粒機では混合原
料に、澱粉を５重量％溶解した水溶液を混合原料の２重
量％連続的に添加することで、混合原料の０．１重量％
の澱粉を溶液状で供給し、ペレットに含まれる澱粉の合
計が０．３重量％、含有水分１０重量％のペレットとな
るよう調整した。このようにして得られたペレットを振
動ふるいに導き、粒径範囲８〜１５mmのペレットを選択
し、選択したペレットをバンドドライヤーにてペレット
中水分が１％以下となるよう乾燥後、ベルトコンベアに
て焼成炉に導いた。The specific procedures and conditions are as follows. 60% by weight of converter dust, 25% by weight of rolling scale, and 15% by weight of anthracite as a carbon material were mixed as raw materials,
Further, a mixture obtained by adding 0.2% by weight of starch to this mixed raw material was sufficiently mixed with a mixer, and then adjusted so that the mixed raw material had a water content of 8% by weight. This was introduced into a ball mill, pulverized so that the particle size of the mixed raw material was 1 mm or less, kneaded sufficiently, and then pelletized by a dish-type granulator. In the granulator, 0.1% by weight of the mixed raw material is added by continuously adding an aqueous solution in which 5% by weight of starch is dissolved to the mixed raw material to 2% by weight of the mixed raw material.
Was supplied in the form of a solution, and adjusted so that the total amount of starch contained in the pellets was 0.3% by weight and the moisture content was 10% by weight. The pellets thus obtained are guided to a vibrating sieve, pellets having a particle size range of 8 to 15 mm are selected, and the selected pellets are dried with a band dryer so that the moisture in the pellets is 1% or less, and then transferred to a belt conveyor. Led to the firing furnace.
【００１２】表１に、焼成炉入側で採取したペレットの
圧壊強度、落下強度、粉化率、造粒の生産性（指標）を
記載する。焼成炉入側でのペレットの粉化率が高くなる
と焼成炉の効率が低下するため、焼成炉入口でのペレッ
ト粉化率は低い方が好ましい。なお、粉化率はベルトコ
ンベアから焼成炉に落下する場所で採取し、篩にて粒度
分布を測定し、３mm未満の重量％を表す。また、生産性
は実施例を１００とした指標で、造粒機で生産されるペ
レットの粒径範囲を８〜１５mmとして生産量の変動を１
０％以内に抑えて８時間以上継続操業できたときの８時
間平均値を比較した。Table 1 shows the crushing strength, drop strength, powdering rate, and granulation productivity (index) of the pellets collected on the entrance side of the firing furnace. If the powdering rate of the pellets on the inlet side of the firing furnace increases, the efficiency of the firing furnace decreases, so that the pelletizing rate at the inlet of the firing furnace is preferably lower. In addition, the powdering ratio is sampled at a place where the powder falls from a belt conveyor into a firing furnace, and the particle size distribution is measured with a sieve. Further, the productivity is an index with the example taken as 100, and the variation in the production amount is 1 with the particle size range of the pellets produced by the granulator being 8 to 15 mm.
The 8-hour average values when the operation could be continued for 8 hours or more while being kept within 0% were compared.
【００１３】［比較例１］比較例１として、転炉ダスト
を６０重量％、圧延スケールを２５重量％、炭材として
無煙炭を１５重量％混合して原料とし、さらに、この混
合原料に澱粉を０．３重量％加えたものをミキサーにて
十分に混合した後、混合原料水分が８重量％となるよう
調整した。これをボールミルに導き、混合原料の粒度が
１mm以下となるよう粉砕し、十分に混練後、皿型造粒機
にてペレット化した。造粒機では混合原料に、水分を混
合原料の２重量％連続的に添加し、含有水分１０重量％
のペレットとなるよう調整した。振動篩で適切な範囲の
直径のペレットを選択後、乾燥機にてペレット中水分が
１％以下となるよう乾燥後、ベルトコンベアにて焼成炉
に導き、焼成炉入口で採取したペレットの圧壊強度、落
下強度、粉化率、生産性（指標）を測定した。これを表
１中に併記した。Comparative Example 1 As Comparative Example 1, 60% by weight of converter dust, 25% by weight of a rolling scale, and 15% by weight of anthracite as a carbon material were used as raw materials, and starch was further added to the mixed raw material. After adding 0.3% by weight, the mixture was sufficiently mixed with a mixer, and then adjusted so that the water content of the mixed raw material became 8% by weight. This was introduced into a ball mill, pulverized so that the particle size of the mixed raw material was 1 mm or less, kneaded sufficiently, and then pelletized by a dish-type granulator. In the granulator, 2% by weight of the mixed raw material is continuously added to the mixed raw material, and the water content is 10% by weight.
Was adjusted to become pellets. After selecting pellets of an appropriate diameter range with a vibrating sieve, drying the pellets with a dryer so that the moisture content in the pellets is 1% or less, guiding the pellets to the firing furnace on a belt conveyor, and crushing the pellets collected at the firing furnace entrance. , Drop strength, powdering rate, and productivity (index) were measured. This is also shown in Table 1.
【００１４】［比較例２］比較例２として、転炉ダスト
を６０重量％、圧延スケールを２５重量％、炭材として
無煙炭を１５重量％混合して原料とし、さらに、この混
合原料に澱粉を１．０重量％加えたものをミキサーにて
十分に混合した後、混合原料水分が８重量％となるよう
調整した。これをボールミルに導き、混合原料の粒度が
１mm以下となるよう粉砕し、十分に混練後、皿型造粒機
にてペレット化した。造粒機では混合原料に、水分を混
合原料の２重量％連続的に添加し、含有水分１０重量％
のペレットとなるよう調整した。振動篩で適切な範囲の
直径のペレットを選択後、乾燥機にてペレット中水分が
１％以下となるよう乾燥後、ベルトコンベアにて焼成炉
に導き、焼成炉入口で採取したペレットの圧壊強度、落
下強度、粉化率、生産性（指標）を測定した。これを表
１中に併記した。Comparative Example 2 As Comparative Example 2, 60% by weight of converter dust, 25% by weight of a rolling scale, and 15% by weight of anthracite as a carbon material were used as raw materials, and starch was further added to this mixed raw material. After adding 1.0% by weight, the mixture was sufficiently mixed with a mixer, and then adjusted so that the water content of the mixed raw material became 8% by weight. This was introduced into a ball mill, pulverized so that the particle size of the mixed raw material was 1 mm or less, kneaded sufficiently, and then pelletized by a dish-type granulator. In the granulator, 2% by weight of the mixed raw material is continuously added to the mixed raw material, and the water content is 10% by weight.
Was adjusted to become pellets. After selecting pellets of an appropriate diameter range with a vibrating sieve, drying the pellets with a dryer so that the moisture content in the pellets is 1% or less, guiding the pellets to the firing furnace on a belt conveyor, and crushing the pellets collected at the firing furnace entrance. , Drop strength, powdering rate, and productivity (index) were measured. This is also shown in Table 1.
【００１５】[0015]
【表１】 [Table 1]
【００１６】表１の実施例と比較例１とから、同一量の
澱粉を用いた場合、本発明のペレットのほうが、比較の
方法で製造したペレットよりも圧壊強度、落下強度とも
に高く、結果としてペレット粉化率が低いという好まし
い結果を得る事ができることが判る。また、実施例と比
較例２とから、比較の方法で製造したペレットで、本発
明の方法で製造したペレットと同等のペレット粉化率を
得るためには多量の澱粉が必要であることが判る。ま
た、生産性（指標）も実施例のほうが優れていることが
判る。From the examples in Table 1 and Comparative Example 1, when the same amount of starch was used, the pellets of the present invention had higher crushing strength and drop strength than the pellets produced by the comparative method. It turns out that a favorable result that the pelletization ratio is low can be obtained. Further, from the examples and comparative example 2, it can be seen that a large amount of starch is required in order to obtain a pelletization ratio equivalent to that of the pellets produced by the method of the present invention in the pellets produced by the comparative method. . In addition, it can be seen that the productivity (index) is better in the example.
【００１７】[0017]
【発明の効果】以上のように本発明方法は、少量の澱粉
で、十分な強度を有する製鉄原料用ペレットを得ること
ができるという優れた特徴を有している。As described above, the method of the present invention has an excellent feature that pellets having sufficient strength can be obtained with a small amount of starch.
【図１】本発明の実施の形態を示す図。FIG. 1 is a diagram showing an embodiment of the present invention.
【図２】本発明法と比較法による、ペレット圧壊強度の
比較を示す図。FIG. 2 is a diagram showing a comparison of pellet crushing strength by the method of the present invention and a comparative method.
【図３】本発明法と比較法による、ペレット落下強度の
比較を示す図。FIG. 3 is a diagram showing a comparison of pellet drop strength between the method of the present invention and a comparative method.
【図４】本発明法と比較法による、乾燥後のペレット圧
壊強度の比較を示す図。FIG. 4 is a diagram showing a comparison of pellet crushing strength after drying according to the method of the present invention and a comparative method.
【図５】本発明法と比較法による、乾燥後のペレット落
下強度の比較を示す図。FIG. 5 is a diagram showing a comparison of pellet drop strength after drying according to the method of the present invention and a comparative method.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 延本 明 兵庫県姫路市広畑区富士町１番地 新日本 製鐵株式会社広畑製鐵所内 Ｆターム(参考） 4K001 AA10 BA14 BA15 CA18 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Akira Nobumoto 1Fuji-cho, Hirohata-ku, Himeji-shi, Hyogo F-term in Nippon Steel Corporation Hirohata Works (reference) 4K001 AA10 BA14 BA15 CA18
Claims (1)
ッジ、鉄鉱石粉等の製鉄工程で発生する鉄含有粉をそれ
ぞれ単独あるいは混合した原料に、石炭、コークス等の
炭材、澱粉を加えて混合、混練し、さらに造粒機で澱粉
溶液を供給して造粒することを特徴とする、製鉄原料用
ペレットの製造方法。An iron-containing powder generated in an iron-making process such as blast furnace / converter dust, rolling scale, sludge, iron ore powder, etc., alone or mixed with a carbonaceous material such as coal and coke and a starch. , Kneading, and granulating by supplying a starch solution with a granulator, and pelletizing the raw material for steelmaking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000171769A JP2001348625A (en) | 2000-06-08 | 2000-06-08 | Method for producing pellet for iron-marking raw material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000171769A JP2001348625A (en) | 2000-06-08 | 2000-06-08 | Method for producing pellet for iron-marking raw material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001348625A true JP2001348625A (en) | 2001-12-18 |
Family
ID=18674281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000171769A Withdrawn JP2001348625A (en) | 2000-06-08 | 2000-06-08 | Method for producing pellet for iron-marking raw material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001348625A (en) |
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| JP2007009240A (en) * | 2005-06-28 | 2007-01-18 | Kobe Steel Ltd | Method for reusing converter dust |
| KR100726208B1 (en) * | 2005-11-11 | 2007-06-11 | 조영기 | The steel ingot or carbon steel ingot manufacturing method and manufacturing devices which uses the steel by product |
| WO2009037943A1 (en) | 2007-09-18 | 2009-03-26 | Kabushiki Kaisha Kobe Seiko Sho | Method for producing briquette with carbonaceous material incorporated therein by use of oil-containing iron-making plant dust |
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| US8206487B2 (en) | 2007-07-27 | 2012-06-26 | Kobe Steel, Ltd. | Method for producing carbon composite metal oxide briquettes |
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| CN103898318A (en) * | 2012-12-31 | 2014-07-02 | 攀钢集团研究院有限公司 | Pelletizing method, pellet ore fresh pellet and pellet ore |
| CN103898318B (en) * | 2012-12-31 | 2016-12-28 | 攀钢集团研究院有限公司 | A kind of method of pelletizing and a kind of pellet raw ball and pellet |
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| CN104726630A (en) * | 2015-03-25 | 2015-06-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | High-alkalinity composite metallized pellet for converter and production process thereof |
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