JPS62297420A - Noncalcined briquetted ore excellent in strength at high temperature - Google Patents
Noncalcined briquetted ore excellent in strength at high temperatureInfo
- Publication number
- JPS62297420A JPS62297420A JP14116486A JP14116486A JPS62297420A JP S62297420 A JPS62297420 A JP S62297420A JP 14116486 A JP14116486 A JP 14116486A JP 14116486 A JP14116486 A JP 14116486A JP S62297420 A JPS62297420 A JP S62297420A
- Authority
- JP
- Japan
- Prior art keywords
- strength
- reduction
- furnace
- ore
- pores
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000011148 porous material Substances 0.000 claims abstract description 29
- 239000011230 binding agent Substances 0.000 claims description 9
- 230000009467 reduction Effects 0.000 abstract description 35
- 239000004568 cement Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000002156 mixing Methods 0.000 abstract description 2
- 239000004484 Briquette Substances 0.000 abstract 4
- 230000006866 deterioration Effects 0.000 abstract 1
- 230000035699 permeability Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000008188 pellet Substances 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 230000007423 decrease Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 7
- 230000001603 reducing effect Effects 0.000 description 6
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 5
- 235000011613 Pinus brutia Nutrition 0.000 description 5
- 241000018646 Pinus brutia Species 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 229910052595 hematite Inorganic materials 0.000 description 4
- 239000011019 hematite Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 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 4
- 239000000203 mixture Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012256 powdered iron Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
３、発明の詳細な説明
（産業上の利用分野）
この発明は、セメントなどの結合剤により塊成化した鉄
鉱石（非焼成塊成鉱）の改良に関するものである。[Detailed Description of the Invention] 3. Detailed Description of the Invention (Field of Industrial Application) This invention relates to the improvement of iron ore agglomerated with a binder such as cement (non-calcined agglomerate). .
（従来の技術）
粉状鉄鉱石を塊成化して高炉用原料とする方法として、
粒鉱と燃料（粉コークス）にセメント、水などを添加し
て混合・造粒する方法が採用されている。(Conventional technology) As a method of agglomerating powdered iron ore and using it as raw material for blast furnaces,
The method used is to add cement, water, etc. to grain ore and fuel (coke breeze), and then mix and granulate the mixture.
この方法により製造された非焼成塊成鉱は、焼成工程を
とらないためＮＯｘ、ＳＯｘの発生がな（、しかも微粉
コークス、無煙炭などの炭材を内装して還元性状を改善
することが可能であるという特徴を持っている。しかし
ながら、次のような欠点を有しているため高炉用原料と
して広く一般的に用いられるに至っていないのが実情で
ある。The uncalcined agglomerate produced by this method does not require a calcination process, so it does not generate NOx or SOx (in addition, it is possible to improve its reducing properties by incorporating carbonaceous materials such as fine coke and anthracite). However, the reality is that it has not been widely used as a raw material for blast furnaces due to the following drawbacks.
（発明が解決しようとする問題点）
その欠点としては、第１に、焼成していないためにパイ
ングー結合水、鉄鉱石中結晶水、自由水などの水分を含
み、還元炉内で分解・蒸発する際に多量の吸熱反応を起
して炉内温度を低下させ、結果として還元遅れ、高炉の
操業変動、燃料比増加を引き起す、自由水については、
工場内で発生する低温排風により乾燥させる方法が提案
されており、それにより蒸発させることができるが、パ
イングー結合水、鉄鉱石中結晶水については分解温度が
高いために除去することは非常に困難である。(Problems to be Solved by the Invention) First, because it is not fired, it contains water such as pine goo bound water, crystalline water in iron ore, and free water, which decomposes and evaporates in the reduction furnace. Regarding free water, which causes a large amount of endothermic reaction during blasting and lowers the temperature inside the furnace, resulting in a reduction delay, fluctuations in blast furnace operation, and an increase in the fuel ratio,
A method of drying using low-temperature exhaust air generated within the factory has been proposed, and it is possible to evaporate it, but it is extremely difficult to remove Paingu bound water and crystalline water in iron ore due to their high decomposition temperatures. Have difficulty.
第２に、通常水硬性結合剤としてはセメントをはじめと
するＣａＯ・５ｉｎ２系のものが使用されるが、これが
脈石量の増加を引き起す。Secondly, as a hydraulic binder, CaO.5in2 type materials such as cement are usually used, but this causes an increase in the amount of gangue.
第３に、一般的に水硬性結合剤の価格は高く、非焼成塊
成鉱の製造コスＦを高（している。Third, the price of hydraulic binders is generally high, making the manufacturing cost F of uncalcined agglomerates high.
以上のような欠点は、いずれも非焼成塊成鉱にはパイン
グーを加えなければならないという宿命に白米するもの
であり、これら欠点を少しでも緩和し、非焼成塊成鉱の
メリットを最大限に引き出すためには、パイングー使用
量を極力減らすことが要請される。All of the above disadvantages are due to the fact that uncalcined agglomerate ore must be added with pine nuts, so it is necessary to alleviate these disadvantages even a little and maximize the benefits of non-calcined agglomerate ore. In order to extract it, it is necessary to reduce the amount of Pine Goo used as much as possible.
これらを改善する品質設計としては、たとえば特開昭５
８−５２４４５号公報に示されるように、鉱石原料に添
加するバインダー量、加圧力、加圧時間を調整して成品
の間隙率を制御し、還元時の粉化を少なくするものがあ
る。For example, as a quality design to improve these,
As shown in Japanese Patent No. 8-52445, there is a method in which the porosity of the product is controlled by adjusting the amount of binder added to the ore raw material, the pressing force, and the pressing time to reduce powdering during reduction.
本発明者らは、前記の事情から製造コストの低減を目的
として成品の気孔に着目し、気孔と熱間強度の関係につ
いて鋭意研究を重ねた結果、熱間強度に優れ、結果的に
セメントなどのバインダー量を低減させた非焼成塊成鉱
を完成させた。Based on the above circumstances, the present inventors focused on the pores of finished products with the aim of reducing manufacturing costs, and as a result of intensive research on the relationship between pores and hot strength, they found that they had excellent hot strength, and as a result, cement, etc. We have completed a non-calcined agglomerate with a reduced amount of binder.
（問題点を解決するための手段）
本発明の要旨は、粉鉱石を主体に結合材を添加して製造
した塊成物内の１０μ輪以上の気孔が塊成物体積に対し
３．０ ％以下であることを特徴とする熱間強度に優れ
た非焼！＆諷成鉱である。(Means for Solving the Problems) The gist of the present invention is that the pores of 10μ or more in the agglomerate produced by adding a binder mainly to fine ore are 3.0% of the volume of the agglomerate. Non-fired with excellent hot strength, characterized by: & It is a rich ore.
（作用）
このような気孔構造を造り込むことによって高炉内での
還元途中の強度低下を低く抑えることができる。したが
って、従来パイングー量は５〜１５％とするのが一般的
であったが、本発明によればパインンー量を５％以下に
しても炉内で十分に形状を保持するので、炉内における
吸熱量が少なく、製造コストお上り脈石量の低い優れた
非焼成塊成鉱となる。(Function) By creating such a pore structure, it is possible to suppress the decrease in strength during reduction in the blast furnace. Therefore, conventionally, the amount of pine goo was generally set at 5 to 15%, but according to the present invention, even if the amount of pine goo is reduced to 5% or less, the shape is sufficiently maintained in the furnace. It is an excellent non-calcined agglomerate with low calorific value, low manufacturing cost and low gangue amount.
本発明の非焼成塊成鉱は、次に詳述するように鉱石銘柄
の選択お上り造粒条件（添加水分等）の適正化により製
造できる。The non-calcined agglomerated ore of the present invention can be produced by selecting the ore brand and optimizing the granulation conditions (added moisture, etc.) as detailed below.
本発明者らが非焼成塊成鉱の還元後強度の低下メカニズ
ムについて鋭意調査、研究を重ねた結果、還元後の強度
低下原因は、大別して■バインダーの熱分解によるもの
、■へマタイトからマグネタイトへの還元膨張によるも
の、の三者に分れ、このうち強度低下に対しては後者■
の作用が大きいことが実験的に明らかになった。As a result of intensive investigation and research by the present inventors on the mechanism of strength reduction after reduction of non-calcined agglomerate ore, the causes of strength decrease after reduction can be roughly divided into: (1) thermal decomposition of binder, (2) change from hematite to magnetite. It is divided into three types: due to reduction and expansion to
It has been experimentally revealed that the effect of
したがって、ベレットの還元後強度低下を抑えるために
は還元のされ方をコントロールすればよく、その一手段
として気孔構造を特定条件に造り込むことによって、そ
れが可能となるのである。Therefore, in order to suppress the decrease in strength of pellets after reduction, it is only necessary to control the method of reduction, and one way to do this is to create a pore structure under specific conditions.
ｍｉ図は、気孔構造が異なる種々のコールドベレットを
同一還元条件（Ｃｏ：Ｎａ＝３０ニア ０゜温度７００
℃）で還元した後、圧潰強度を測定したもので、横軸に
同図（Ａ）は１０μ−以上の気孔のベレット体積に対す
る含有割合、同図（Ｂ）は８μ論以上の気孔の同じくベ
レット体積に対する含有割合である。第１図から明らか
な如（，１０μ輪以上の気孔割合を指標にとれば還元後
強度との相関が明確であり、その割合が３％を境に、そ
れ以下では強度は高いが、３％超では強度は急激に低下
している。また、８μ−以上の場合は還元後強度との相
関が明確でない。The mi diagram shows various cold pellets with different pore structures under the same reduction conditions (Co:Na = 30 near 0° temperature 700°C).
The crushing strength was measured after reduction at ℃), and the horizontal axis shows (A) the content ratio of pores of 10μ or more to the pellet volume, and (B) of the same pellet with pores of 8μ or more. This is the content ratio relative to volume. As is clear from Figure 1, if the percentage of pores with a diameter of 10μ or more is taken as an index, there is a clear correlation with the strength after reduction. When the strength exceeds 8μ, the strength decreases rapidly.When the strength exceeds 8μ, the correlation with the strength after reduction is not clear.
この実験結果により、非焼成塊成鉱の還元後強度は全気
孔割合にはあまり影響されず、１０μ一以上の気孔割合
により決まることがわかる。The experimental results show that the strength after reduction of uncalcined agglomerate ore is not significantly influenced by the total pore ratio, but is determined by the pore ratio of 10μ or more.
尚、好ましい範囲としては、１０μ−以上の気孔割合を
２．５ ％以下にする。In addition, as a preferable range, the proportion of pores of 10 μm or more is set to 2.5% or less.
これを楳弐図によりさらに具体的に説明する。This will be explained more specifically using Umeji.
第２図は第１図の実験データのうち、気孔構造が異なる
２種類のベレットを同一還元条件（ＣＯ：Ｎ、＝３０ニ
ア０．温度７００℃）で還元した後の断面を示したもの
である。Figure 2 shows cross sections of the experimental data shown in Figure 1 after two types of pellets with different pore structures were reduced under the same reducing conditions (CO:N, = 30 near 0, temperature 700°C). be.
初期気孔量のうち大きな気孔の気孔率の低い（Ａ）では
マグネタイト生成量が少なく、しかも比較的外殻に近い
箇所に生成しているのに対し、初期気孔量のうち大きな
気孔の気孔率の高い（Ｂ）ではマグネタイト生成量が多
く、かつ内部まで生成している。In (A), where the porosity of the large pores among the initial pores is low, the amount of magnetite produced is small and is generated relatively close to the outer shell, whereas the porosity of the large pores among the initial pores is small. At high (B), the amount of magnetite produced is large and is produced even inside.
これらの強度は、初期強度は（Ｂ）の方が高いにもかか
わらず、還元後強度は（Ｂ）の方がはるかに低い結果と
なった。また、還元後体積膨張率をみると、（Ａ）が約
０゜５％であるのに対し、（Ｂ）は約３．０％ と＾い
結果となった。すなわち、（Ｂ）のベレットは比較的大
きな気孔が多いため、還元ガスが内部まで拡散し易く、
それによってヘマタイトからマグネタイトへの還元がベ
レット全体に均一に起り、還元膨張・強度低下に至ると
考えられる。これに対し、（Ａ）のベレットでは天外な
気孔が少ないため、還元ガスが内部まで浸透しにくく、
外殻付近でヘマタイト→マグネタイト→ウスタイト→鉄
と順次還元が進行するためマグネタイＦ生成量が少なく
、還元膨張・強度低下が抑えられるものと考えられる。Regarding these strengths, although the initial strength of (B) was higher, the strength after reduction was much lower for (B). Also, looking at the volumetric expansion coefficient after reduction, (A) was about 0.5%, while (B) was about 3.0%. In other words, since the pellet (B) has many relatively large pores, the reducing gas easily diffuses into the inside.
It is thought that this causes the reduction of hematite to magnetite to occur uniformly throughout the pellet, leading to reduction expansion and a decrease in strength. On the other hand, the pellet of (A) has fewer pores, so it is difficult for the reducing gas to penetrate inside.
It is thought that because the reduction progresses in the order of hematite → magnetite → wustite → iron near the outer shell, the amount of magnetite F generated is small, and reduction expansion and strength reduction are suppressed.
以上の考察と実験結果より、還元後強度低下を抑えるた
めには、１０μ曽以上の気孔率を一定値以下にすること
により第２図（Ａ）のような還元形態をとらせることが
有効な手段になるといえる。From the above considerations and experimental results, in order to suppress the decrease in strength after reduction, it is effective to reduce the porosity of 10μ or more to a certain value or less to achieve the reduction form shown in Figure 2 (A). It can be said to be a means.
これらペレットの気孔構造は原料配合によって決まり、
たとえば豪州系鉱石（ハマスレイ）を高配合した場合、
ベントナイトを添加したときに粗大気孔の気孔率が小さ
くなる傾向にあり、これらを適宜フントロールして本発
明の非焼成塊成鉱を製造することができる。The pore structure of these pellets is determined by the raw material composition,
For example, if a high content of Australian ore (Hamasley) is used,
When bentonite is added, the porosity of the coarse pores tends to become smaller, and the non-calcined agglomerate of the present invention can be produced by appropriately funneling these.
尚、気孔径および気孔率の測定方法は、水以圧入法によ
り気孔径分布を測定する一方、Ａ成鉱を水銀に浸漬し、
その比体積を求めることにより次式により産出できる。The pore size and porosity were measured by measuring the pore size distribution by the water injection method, and by immersing the A-forming ore in mercury.
By determining its specific volume, it can be produced using the following formula.
１０μ膳以上の気孔率（％） ｘｉ ｏ。Porosity (%) of 10μ or more xi o.
（実施例）
原料配合およびセメント系パイングー配合割合を変えた
各種類の粒度１４〜１８ｍｍのベレットを製造し、これ
を１０日間養生した後、シャフト還元炉においてＣＯ：
Ｎ２＝３０ニア ０の混合ガスで還元したときの強度変
化を表１１二比較例と共シこ示した。(Example) Various types of pellets with a particle size of 14 to 18 mm were produced with different raw material compositions and cementitious paint ratios, and after curing for 10 days, CO:
Table 11 shows the change in strength when reduced with a mixed gas of N2=30N2 and the two comparative examples.
尚、添加水分は鉱石銘柄固有の吸水性に応じて増減させ
、生ベレット落下強度が最大になる水分値を予め決定し
、養生・還元に供した。The added moisture was increased or decreased depending on the water absorption characteristic of the ore brand, and the moisture value at which the raw pellet drop strength was maximized was determined in advance and used for curing and reduction.
表１からも明らかな如く、１０μ−以上の気孔割合が３
．０％をこえると還元後強度が着しく低下しており、１
０μ−以上の気孔率を３％以下に制御することにより、
ベレットの還元後強度を高く維持することが可能となっ
た。また、パイングー量は従来通常５〜１５％であった
が、５％以下に減らしても、本発明によれば還元後強度
をかなり高く維持することが可能となった。As is clear from Table 1, the proportion of pores larger than 10μ is 3.
．． If it exceeds 0%, the strength after reduction decreases considerably, and 1
By controlling the porosity of 0μ or more to 3% or less,
It became possible to maintain high strength of the pellet after reduction. Further, the amount of pine goo was conventionally usually 5 to 15%, but even if it is reduced to 5% or less, according to the present invention, it has become possible to maintain a considerably high strength after reduction.
（発明の効果）
以上詳述した如ぐ、本発明によれば還元後強度低下を抑
えることができるので、高炉などシャフト炉の還元炉内
で形状を保持させ、安定した炉内通気状態を確保するこ
とができる。また、同時に脈石量の低下、バインダーの
低減による炉内温度低下の防止、製造コストの低下など
の効果も得られるので、従来よりも高炉などの還元炉に
おける非焼成塊成鉱の配合率を増すことが可能となり、
銑鉄原単位低減に役立つ。(Effects of the Invention) As detailed above, according to the present invention, it is possible to suppress a decrease in strength after reduction, so that the shape can be maintained in the reduction furnace of a shaft furnace such as a blast furnace, and a stable ventilation condition inside the furnace can be ensured. can do. At the same time, it also reduces the amount of gangue, prevents temperature drops in the furnace by reducing the amount of binder, and lowers production costs, so the blending ratio of uncalcined agglomerate in reduction furnaces such as blast furnaces is lower than in the past. It becomes possible to increase
Helps reduce pig iron consumption.
第１図（Ａ）、（Ｂ）は非焼成塊成鉱の気孔と還元後強
度の関係図、ｔＩＩＪ２図（Ａ）、（Ｂ）は非焼成塊成
鉱の還元状況の説明図である。
１・・・ヘマタイト、２・・・マグネタイト、３・・・
ウスタイト。FIGS. 1(A) and (B) are diagrams showing the relationship between the pores of uncalcined agglomerate ore and the strength after reduction, and tIIJ2 diagrams (A) and (B) are explanatory diagrams of the state of reduction of uncalcined agglomerate ore. 1... Hematite, 2... Magnetite, 3...
Uestite.
Claims (1)
内の１０μｍ以上の気孔が塊成物体積に対し３．０％以
下であることを特徴とする熱間強度に優れた非焼成塊成
鉱。(1) Excellent hot strength characterized by the fact that the pores of 10 μm or more in the agglomerate produced by adding a binder mainly to fine ore are 3.0% or less of the volume of the agglomerate. Uncalcined agglomerate ore.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61141164A JPH0781169B2 (en) | 1986-06-17 | 1986-06-17 | Non-fired agglomerated ore with excellent hot strength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61141164A JPH0781169B2 (en) | 1986-06-17 | 1986-06-17 | Non-fired agglomerated ore with excellent hot strength |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62297420A true JPS62297420A (en) | 1987-12-24 |
| JPH0781169B2 JPH0781169B2 (en) | 1995-08-30 |
Family
ID=15285623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61141164A Expired - Lifetime JPH0781169B2 (en) | 1986-06-17 | 1986-06-17 | Non-fired agglomerated ore with excellent hot strength |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0781169B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100415920B1 (en) * | 1996-12-18 | 2004-03-31 | 주식회사 포스코 | Method for lumping preliminary hot compacted iron |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58124529A (en) * | 1982-01-19 | 1983-07-25 | Sanyo Kokusaku Pulp Co Ltd | Granulation of powdery ore |
-
1986
- 1986-06-17 JP JP61141164A patent/JPH0781169B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58124529A (en) * | 1982-01-19 | 1983-07-25 | Sanyo Kokusaku Pulp Co Ltd | Granulation of powdery ore |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100415920B1 (en) * | 1996-12-18 | 2004-03-31 | 주식회사 포스코 | Method for lumping preliminary hot compacted iron |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0781169B2 (en) | 1995-08-30 |
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