JPS627823A - Method for sintering hardly briquettable fine ore - Google Patents
Method for sintering hardly briquettable fine oreInfo
- Publication number
- JPS627823A JPS627823A JP14802785A JP14802785A JPS627823A JP S627823 A JPS627823 A JP S627823A JP 14802785 A JP14802785 A JP 14802785A JP 14802785 A JP14802785 A JP 14802785A JP S627823 A JPS627823 A JP S627823A
- Authority
- JP
- Japan
- Prior art keywords
- ore
- briquettable
- fine ore
- hardly
- pseudo
- 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
- 238000005245 sintering Methods 0.000 title claims description 13
- 238000000034 method Methods 0.000 title claims description 8
- 239000010802 sludge Substances 0.000 claims abstract description 18
- 238000004898 kneading Methods 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims description 19
- 239000008187 granular material Substances 0.000 claims description 16
- 239000010419 fine particle Substances 0.000 claims 1
- 239000008188 pellet Substances 0.000 abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 2
- 239000004576 sand Substances 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 21
- 238000005469 granulation Methods 0.000 description 11
- 230000003179 granulation Effects 0.000 description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 8
- 239000002994 raw material Substances 0.000 description 7
- 239000011230 binding agent Substances 0.000 description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 4
- 235000012255 calcium oxide Nutrition 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 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
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000007771 core particle Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、製鉄原料として使用する難造粒性鉱石粉の焼
結法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for sintering difficult-to-granulate ore powder used as a raw material for iron manufacturing.
高炉操業のための原料調製のための焼結に当たっては、
焼結反応を均一に進行させるために一旦擬似粒子化され
る。この擬似粒子はペレットへの装入条件によって充填
状態が悪化するような影響を受は難いこと、焼結過程で
崩壊せずに保持されていることが重要である。When sintering to prepare raw materials for blast furnace operation,
In order to make the sintering reaction proceed uniformly, it is once made into pseudo-particles. It is important that these pseudo-particles are not easily affected by the conditions in which they are charged into the pellets such that the filling state deteriorates, and that they are maintained without collapsing during the sintering process.
従来、鉱石の焼結に際しての事前処理として２〜３＋ｌ
ｌｆｆ１程度の粒度の粉鉱石にコークスと石灰石などの
原料を造粒機中で水とともに混練して造粒していた。Conventionally, 2~3+L was used as a pre-treatment for sintering ore.
Raw materials such as coke and limestone were mixed with water in a granulator to granulate ore powder having a particle size of about lff1.
この造粒の機構は、ミクロ的には核粒子の凹部に微粉原
料が付着して擬似粒子を形成するものである。しかしな
がら、ペレットフィード、砂鉄のような銘柄の原料を使
用した場合には微粉鉱石の付着性が悪く、造粒が困難な
場合がある。かかる難造粒性微粉鉱石は、直接焼結原料
として使用すると焼成過程で通気阻害を起こし、生産性
が低下する。The mechanism of this granulation is that, microscopically, the fine powder raw material adheres to the concave portions of the core particles to form pseudo particles. However, if a brand of raw material such as pellet feed or iron sand is used, the adhesion of fine ore may be poor and granulation may be difficult. If such difficult-to-granulate fine ore is directly used as a sintering raw material, ventilation will be inhibited during the sintering process, resulting in a decrease in productivity.
このため、かかる難造粒性の鉱石の造粒焼結性を高める
ための改善策として、例えばベントナイト等のバインダ
ーを用いることが提案されているが、これらバインダー
により焼結鉱中の不純物が増え、品質を悪化させたり、
また、コスト増をもたらすという問題があった。Therefore, as an improvement measure to improve the granulation and sinterability of such difficult-to-granulate ores, it has been proposed to use binders such as bentonite, but these binders increase impurities in the sintered ore. , deteriorate the quality,
Additionally, there was a problem of increased costs.
造粒が困難な鉱石粉は顕微鏡的にも極めて滑らかな表面
を有していることが、微粉鉱石の付着性を低下させ、造
粒を困難にしている原因であることが分かった。It has been found that ore powder, which is difficult to granulate, has a microscopically extremely smooth surface, which reduces the adhesion of fine ore powder and makes granulation difficult.
本発明の目的は、難造粒性鉱石の付着性を改善し擬偵粒
化性を高めて焼結性を向上させる方法を提供することに
ある。An object of the present invention is to provide a method for improving the adhesion of difficult-to-granulate ores, increasing pseudo-granulation properties, and improving sinterability.
かかる目的は、転炉排ガスから回収される転炉スラジを
難造粒鉱石粉末に混合し混練することによって達成する
ことができる。This objective can be achieved by mixing and kneading converter sludge recovered from converter exhaust gas with difficult-to-granulate ore powder.
周知のように、転炉スラジはミクロンサイズの比較的高
純度の酸化鉄粉末の集合体であり、従来から特公昭４５
−４１４８１号公報、特開昭４８−１４５１３号公報、
特開昭４９−１３００２号公報等に記載されているよう
にその利用が図られて来た。As is well known, converter sludge is an aggregate of micron-sized relatively high-purity iron oxide powder,
-41481 publication, JP-A-48-14513 publication,
Its use has been attempted as described in Japanese Unexamined Patent Publication No. 49-13002.
本発明は、この転炉スラジが造粒混練時にペレットフィ
ードのような難造粒性鉱石原料の核粒表面に付着して、
ミクロ的な凹凸を形成し、この凹凸面に微粉鉱石が侵入
付着して擬似粒子化を促進すると共に、生石灰と同等の
通気性改善効果があるという知見に基づいて完成したも
のである。In the present invention, this converter sludge adheres to the surface of core grains of difficult-to-granulate ore materials such as pellet feed during granulation and kneading.
This product was developed based on the knowledge that it forms microscopic irregularities, and that fine ore particles penetrate and adhere to these irregular surfaces, promoting the formation of pseudo-particles, and that it has the same effect of improving air permeability as quicklime.
即ち、難造粒性鉱石の微粉に、水分１５％以下の小塊状
をなす転炉スラジを添加して、ボールミル型の混練機で
破砕混練することによって難造粒性鉱石の微粉が付着し
た表面が凹凸状をなす粒子を得、難造粒性鉱石自体の造
粒性を改善したものである。That is, converter sludge in the form of small lumps with a moisture content of 15% or less is added to fine powder of difficult-to-granulate ore, and the mixture is crushed and kneaded using a ball mill-type kneader to form a surface to which fine powder of difficult-to-granulate ore is attached. This yields particles with an uneven shape and improves the granulation properties of the difficult-to-granulate ore itself.
この粒子を焼結するに際しては、造粒性は改善されたが
、依然として微細であり、直接使用すると通気阻害を起
こすために、別工程で調製したバインダーを添加しない
通常の粉末鉱石を例えばドラムミキサーを用いて造粒し
た粒子と混合して使用すると良い。When sintering these particles, the granulation properties have been improved, but they are still fine and if used directly, they will cause ventilation obstruction, so ordinary powder ore prepared in a separate process without the addition of a binder is used, for example, in a drum mixer. It is best to use it by mixing it with particles granulated using.
具体的には、難造粒性の鉱石粉に自然乾燥後の転炉ダス
トを４０〜７０重量％添加して、ボールミルで混練した
後に、ドラムミキサーで造粒し、次いで貯蔵ホッパーで
１２時間〜７日間養成する。この養成後の難造粒性の造
粒鉱石に通常のバインダーを添加しないで、造粒した鉱
石にペレットフィード単味換算で３〜９重景％配合して
焼結する。Specifically, 40 to 70% by weight of air-dried converter dust is added to difficult-to-granulate ore powder, kneaded in a ball mill, granulated in a drum mixer, and then stored in a storage hopper for 12 hours or more. Train for 7 days. A normal binder is not added to the hard-to-granulate granulated ore after curing, but the granulated ore is mixed with 3 to 9 weight percent in terms of pellet feed alone and sintered.
ここで、転炉スラジの含水量が約３０％相当あるために
直接使用するとボールミルの設備の制約上から磨砕でき
ないので、ヤード積みにして自然乾燥すると含水量が１
５％以下となり、増配合が可能となり表着と擬似粒化が
容易となる。この理由から転炉スラジの配合量は４０重
量％よりすくないと、転炉スラジ自体の自己酸化発熱硬
化不足による擬似粒子の強化が図れず、逆に７０重量％
より多いと、転炉スラジの自己酸化発熱過多による擬似
粒の崩壊を招くことになる。Here, since the moisture content of converter sludge is approximately 30%, if it is used directly, it cannot be ground due to the limitations of the ball mill equipment, so if it is piled up in a yard and dried naturally, the moisture content will be reduced to 1.
It becomes 5% or less, which makes it possible to increase the content and facilitate surface adhesion and pseudo-granulation. For this reason, if the blending amount of converter sludge is less than 40% by weight, the pseudo particles cannot be strengthened due to insufficient self-oxidation exothermic hardening of the converter sludge itself;
If the amount is larger than this, the pseudo grains will collapse due to excessive self-oxidation heat generation of the converter sludge.
貯蔵ホッパーにおける養成は１２時間以下であると、ス
ラジの自己発熱硬化不足から擬似粒子が輸送中あるいは
焼結機装入時に粉化し易く、通気性、焼結鉱の品質を阻
害する。一方、７日以上の養成となると自己発熱硬化に
より擬似粒子が各々結合して大塊状化して使用できなく
なる頻度が増大する。If the curing time in the storage hopper is less than 12 hours, the self-heating hardening of the sludge is insufficient, and pseudo particles are likely to be powdered during transportation or during charging into the sintering machine, impairing air permeability and quality of the sintered ore. On the other hand, if the curing is carried out for more than 7 days, the pseudo-particles will combine with each other due to self-heating curing to form large agglomerates and become unusable.
勿論、これらの造粒に際しては、従来、通気性向上のた
めのバインダーとしてもちいられてきた生石灰粉末も使
用することができるが、転炉スラジ粉末による付着性と
通気性が改善されるので、従来よりもその添加量は少な
くてよい。Of course, quicklime powder, which has conventionally been used as a binder to improve air permeability, can also be used for granulation, but converter sludge powder improves adhesion and air permeability, so The amount added may be smaller than that.
平均８０〜９０μ隋粒径のペレットフィード微粉７．２
重量％と、平均粒径が１８ｍ酸化鉄粒子が集合した平均
粒径２ｏＩＩＩＩｌの塊状転炉スラジ５．３重量％を配
合して、ボールミル中で破砕混練することによって平均
粒径８ｏμｍの造粒子を得た。Pellet feed fine powder with average particle size of 80-90μ 7.2
% by weight and 5.3% by weight of lumpy converter sludge with an average particle size of 2oIIIl in which iron oxide particles with an average particle size of 18m are aggregated, and crushed and kneaded in a ball mill to form particles with an average particle size of 8oμm. Obtained.
これに、別にバインダー添加の必要性のない造粒性のよ
い粉末鉱石８７．５重量％を混練して得た平均粒径２５
ＩＩｌ＋１のペレットを調製し、このペレットに対して
、前記転炉スラジを添加して得たペレットフィードを１
２．５重量％添加して焼結した。This was mixed with 87.5% by weight of powdered ore with good granulation properties that do not require the addition of a binder, with an average particle size of 25%.
IIl+1 pellets were prepared, and the pellet feed obtained by adding the converter sludge to the pellets was added to 1
2.5% by weight was added and sintered.
焼結工程中、これらの粒子は何等崩壊することがなく、
平均粒径２．５■の焼結用粉末鉱石を得ることができ、
また、生産性も４〜５％向上した。During the sintering process, these particles do not disintegrate in any way;
It is possible to obtain powder ore for sintering with an average particle size of 2.5μ,
Additionally, productivity improved by 4 to 5%.
本発明は、転炉スラジを生石灰粉に代わって使用するこ
とができるので、転炉スラジの存効利用ばかりではなく
、生石灰の使用量が低減され、また従来、難造粒性のた
めに使用が制限されてきた各種の原料を多量に使用でき
るという効果を奏することができる。The present invention allows converter sludge to be used in place of quicklime powder, which not only makes effective use of converter sludge, but also reduces the amount of quicklime used. It is possible to achieve the effect that various raw materials, which have been limited, can be used in large quantities.
Claims (1)
造粒性鉱石粉の表面に細粒子を固着して後に造粒するこ
とを特徴とする難造粒性鉱石粉の焼結法。1. Difficult to granulate ore powder, which is characterized by adding converter sludge to difficult to granulate ore powder, kneading it, fixing fine particles on the surface of the difficult to granulate ore powder, and then granulating it. Sintering method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60148027A JPH0643617B2 (en) | 1985-07-04 | 1985-07-04 | Sintering method of hard-to-granulate ore powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60148027A JPH0643617B2 (en) | 1985-07-04 | 1985-07-04 | Sintering method of hard-to-granulate ore powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS627823A true JPS627823A (en) | 1987-01-14 |
| JPH0643617B2 JPH0643617B2 (en) | 1994-06-08 |
Family
ID=15443472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60148027A Expired - Lifetime JPH0643617B2 (en) | 1985-07-04 | 1985-07-04 | Sintering method of hard-to-granulate ore powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0643617B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53142301A (en) * | 1977-05-18 | 1978-12-12 | Nippon Steel Corp | Treating method for finely powdered raw material |
-
1985
- 1985-07-04 JP JP60148027A patent/JPH0643617B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53142301A (en) * | 1977-05-18 | 1978-12-12 | Nippon Steel Corp | Treating method for finely powdered raw material |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0643617B2 (en) | 1994-06-08 |
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