JPH0139550B2 - - Google Patents
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- Publication number
- JPH0139550B2 JPH0139550B2 JP3159383A JP3159383A JPH0139550B2 JP H0139550 B2 JPH0139550 B2 JP H0139550B2 JP 3159383 A JP3159383 A JP 3159383A JP 3159383 A JP3159383 A JP 3159383A JP H0139550 B2 JPH0139550 B2 JP H0139550B2
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- Prior art keywords
- properties
- sintered ore
- individual
- index
- determined
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Food Science & Technology (AREA)
- Analytical Chemistry (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Medicinal Chemistry (AREA)
- Physics & Mathematics (AREA)
- Remote Sensing (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
本発明は、焼結鉱の性状を迅速且つ簡単に測定
することができる方法に関する。
焼結鉱の被還元性や還元粉化性は高炉操業にと
つて望ましいレベルに維持する必要があり、この
ため焼結操業では得られる焼結鉱の被還元性、還
元粉化性などの性状を常に監視し、これを管理す
る必要がある。従来、このうちの被還元性を測定
する方法として、試料を還元ガスで所定時間還元
し、その時の酸素除去量から還元率を求めるとい
う方法が一般的に行われている。この方法はJIS
に規格され、具体的には、焼結鉱試料500grを
CO30％、N270％、15／minの還元ガスで900
℃、180分間還元し、その時の酸素除去量から還
元率を求める試験を２回行い、その平均値を求め
て還元率を決定するものである。しかし、この方
法は、粒度調整のための試料の縮分、篩分や化学
分析を行つた上３時間の還元試験を行うため、１
回の試験に最低６時間程度かかり、このため事実
上１〜２日に１回程度しか行うことができず、実
操業の被還元性管理に用いるには十分なものとは
言い難い。また還元粉化性を求める方法として、
上記被還元性測定法と同様の還元ガスで550℃、
30分間還元し、この試料を30rpmで30分間、900
回転させた後３mmの篩で篩分け、−３mmの粒子の
割合を還元粉化率として求める方法が行われてい
る。しかし、この測定方法も測定自体に時間がか
かるため日に２〜３回程度の頻度で行うのが限度
であり、上記被還元性の測定と同様、実操業の管
理に用いるには十分なものと言い難い。また焼結
鉱の性状を測定する他の方法として、コイルを備
えた円筒内に焼結鉱試料を装入し、これに含まれ
るマグネタイトの割合によつて起る共振周波数の
変化を利用してマグネタイトの定量分析を行う方
法があるのが、、この方法では、焼結鉱中の重要
成分であるヘマタイト、カルシウムフエライト等
の非磁性鉱物の定量分析はできず、このため精度
の高い還元率の予測はできない。
従来、焼結鉱組織を定量化することができる装
置として特開昭45―83895号に示されるような画
像処理によるものが知られている。しかし、この
ような装置は鉱物相組織の定量化だけを目的とし
たものであり、その定量値から積極的に鉱物（例
えば焼結鉱）の性状を求めようとするものではな
い。
また、本件出願人は先に特願昭57―150013号
（特開昭59―40165号）において焼結鉱性状の測定
方法を提案したが、その骨子は焼結鉱のミクロ組
織の画像から、ヘマタイト、マグネタイト等のミ
クロ組織割合だけでなく、元鉱部、焼結部などの
マクロ組織割合をも求めようというもので、これ
も組織割合の定量化そのものを主眼とした技術で
ある。
また、同提案には定量分析値から焼結鉱の物性
を求める手法として、マクロ気孔割合そのものか
ら被還元率を、また２次ヘマタイトと元鉱割合か
ら還元粉化率を求めるという内容が示されている
が、これらは極く限られた組織の、しかも定量値
そのものを用いた手法であり、その精度にはある
程度の限界がある。
本発明はこのような現状に鑑み研究開発された
もので、焼結鉱の特定性状（又は該性状の主たる
支配因子）に関する焼結鉱中個別組織固有の指数
（又は値）と画像処理により得られる焼結試料中
の上記各個別組織の面積比率（組織割合）とか
ら、焼結鉱試料の性状指数を簡単且つ迅速に測定
することに成功したものである。本発明者等は、
焼結鉱を構成する各個別組織固有の性状に注目
し、この性状及び焼結鉱中各個別組織の組織割合
と、焼結鉱そのものの性状との関係を検討した結
果、特定性状又は該性状の主たる支配因子に関す
る各個別組織固有の指数又は値に当該個別組織の
全体に対する面積比率を乗じて得られる数値の総
和が実測値と明確な相関を有することを知見した
ものであり、本発明はこのような知見に基づいて
構成されたものである。
このような本発明の構成は、焼結鉱の特定の性
状を測定するに当り、焼結鉱の組織を構成個別組
織に分類し、各構成個別組織の人工的に合成され
た単一鉱物相から上記性状又は該性状の主たる支
配因子に関する各個別組織固有の指数又は値をあ
らかじめ求めておき、画像処理により焼結鉱試料
の上記各個別組織の面積比率を測定し、下式によ
り上記焼結鉱試料の特定性状に関する性状指数Ｐ
を求めるようにしたものである。
但し、Ｐ：性状指数
Pi：特定性状又は該性状の主たる支配
因子に関する各個別組織固有の指数
又は値
Si：画像処理によつて求められた試料
中各個別組織の面積比率
ａ：係 数
ｎ：個別組織の数
例えば、焼結鉱の被還元性を測定する場合に
は、被還元性に関する各個別組織固有の還元指数
をそれぞれ求めておき、画像処理により測定され
た個別組織の面積比率S1〜Soと個別組織の還元指
数P1〜Poとから上記式により還元指数Ｐを求め
る。
以下、本発明を詳細に説明する。
本発明法で測定される焼結鉱性状としては被還
元性、還元粉化性等があるが、いずれの性状を測
定する場合でも、焼結鉱の組織を構成個別組織に
分類して上記性状又はその性状の主たる支配因子
に関する各個別組織固有の指数又は値をそれぞれ
予め求めておく。この組織分類の一例による個別
組織（鉱物相）として以下のものがあげられる。
(1)微細型ヘマタイト…ヘマタイト粒子は小さく、
粒子どうしは主として拡散結合のネツトワーク
を構成している。
(2)２次ヘマタイト…スラグプール中に肥大化して
晶出している。
(3)微細型カルシウムフエライト…微細組織を有す
るカルシウムフエライト。
(4)針状カルシウムフエライト…微細型カルシウム
フエライトが成長し針状を呈する組織。
(5)短冊型カルシウムフエライト…スラグプール中
に晶出してできる。
このような組織（鉱物相）の他に気孔部、スラ
グ等の各組織部があることは言うまでもない。ま
た、他に少量ではあるがマグネタイト組織が含ま
れる場合がある。最近の焼結鉱は還元性向上を図
るため焼結温度を低く管理しており、このため製
品焼結鉱中のマグネタイト量も従来焼結鉱に比較
し低くなつている。従つて実際の測定ではこのマ
グネタイト組織を個別組織の分類が外すことも可
能である。本発明では、このように分類された各
個別組織固有の性状（又は性状の主たる支配因
子）を求める。本発明者等の検討したところによ
れば、焼結鉱を構成する各個別組織は、被還元性
や還元粉化性に関して固有の特徴を有しており、
例えば、上記分類によ個別組織の場合では、被還
元性は微細型カルシウムフエライト、微細型ヘマ
タイト＞針状カルシウムフエライト、２次ヘマタ
イト＞短冊型カルシウムフエライトの順に向上す
ることが確められている。
以上のような各個別組織固有の性状（又は性状
の主たる支配因子）を求めるため、個別組織（鉱
物相）をそれぞれ単一鉱物相として人工的に合成
する必要がある。この単一鉱物相を合成する一方
法として、Ｘ線マイクロアナライザーにより実際
の焼結鉱組織の定量分析を行い、この分析結果か
ら試薬により組織の合成を行うものである。また
特に溶融組織合成を行う場合には、鉱物相の周辺
マトリクス組成も分析し、試薬により両者の量
比、温度、保持時間、雰囲気等を決定するもので
ある。下表はその合成条件の一例を示すもので、
これらによつて得られた各合成組織相は顕微鏡観
察及びＸ線回析により、そのほぼ90％以上が目的
鉱物相であることが確認されている。
The present invention relates to a method for quickly and easily measuring the properties of sintered ore. The reducibility and reduction pulverizability of sintered ore must be maintained at a desirable level for blast furnace operation. must be constantly monitored and managed. Conventionally, as a method for measuring reducibility, a method has generally been used in which a sample is reduced with a reducing gas for a predetermined period of time, and the reduction rate is determined from the amount of oxygen removed at that time. This method uses JIS
Specifically, the sintered ore sample is 500gr.
900 with CO30%, N2 70%, 15/min reducing gas
℃ for 180 minutes, the test is performed twice to determine the reduction rate from the amount of oxygen removed at that time, and the average value is determined to determine the reduction rate. However, this method requires a 3-hour reduction test in addition to reduction, sieving, and chemical analysis of the sample to adjust the particle size.
Each test takes at least about 6 hours, and therefore can only be carried out once every 1 to 2 days, and cannot be said to be sufficient for use in managing reducibility in actual operations. In addition, as a method for determining reduction powdering property,
550℃ using the same reducing gas as in the reducibility measurement method above.
Reduce for 30 min, and this sample was heated at 30 rpm for 30 min at 900
After rotation, the particles are sieved through a 3 mm sieve, and the percentage of -3 mm particles is determined as the reduction powdering rate. However, this measurement method also takes time to measure, so it can only be carried out two or three times a day.As with the reducibility measurement mentioned above, it is sufficient for use in managing actual operations. It's hard to say. Another method for measuring the properties of sintered ore is to charge the sintered ore sample into a cylinder equipped with a coil and use the change in resonance frequency caused by the proportion of magnetite contained in the sample. There is a method for quantitatively analyzing magnetite, but this method cannot quantitatively analyze non-magnetic minerals such as hematite and calcium ferrite, which are important components in sintered ore. It is impossible to predict. Conventionally, as a device capable of quantifying the structure of sintered ore, a device using image processing as shown in Japanese Patent Application Laid-open No. 83895/1984 has been known. However, such a device is intended only for quantifying the mineral phase structure, and is not intended to actively determine the properties of the mineral (for example, sintered ore) from the quantitative value. In addition, the present applicant previously proposed a method for measuring the properties of sintered ore in Japanese Patent Application No. 150013/1983 (Japanese Patent Application No. 40165/1982), but the gist of the method was to The aim is to determine not only the microstructure ratio of hematite, magnetite, etc., but also the macrostructure ratio of the original ore part, sintered part, etc., and this is also a technology that focuses on quantifying the structure ratio itself. In addition, the proposal also states that as a method for determining the physical properties of sintered ore from quantitative analysis values, the reduction rate is determined from the macroporosity itself, and the reduction powdering rate is determined from the proportion of secondary hematite and the original ore. However, these methods use quantitative values of extremely limited tissues, and their accuracy is limited to some extent. The present invention has been researched and developed in view of the current situation, and is based on the index (or value) specific to individual structures in sintered ore related to the specific properties of sintered ore (or the main controlling factor of the properties) obtained through image processing. The property index of the sintered ore sample was successfully measured simply and quickly from the area ratio (structure ratio) of each of the above-mentioned individual structures in the sintered sample. The inventors,
As a result of focusing on the unique properties of each individual structure that makes up the sintered ore and examining the relationship between this property, the proportion of each individual structure in the sintered ore, and the properties of the sintered ore itself, we found that the specific properties or the properties It was discovered that the sum of the numerical values obtained by multiplying the index or value unique to each individual tissue regarding the main controlling factor of the individual tissue by the area ratio of the individual tissue to the whole has a clear correlation with the actual measured value, and the present invention It was constructed based on such knowledge. Such a configuration of the present invention is such that, when measuring specific properties of sintered ore, the structure of sintered ore is classified into constituent individual structures, and an artificially synthesized single mineral phase of each constituent individual structure is detected. The index or value specific to each individual structure regarding the above properties or the main controlling factor of the properties is determined in advance from Property index P related to specific properties of ore samples
It was designed to ask for. However, P: Property index Pi: Index or value specific to each individual tissue regarding a specific property or the main controlling factor of the property Si: Area ratio of each individual tissue in the sample determined by image processing a: Coefficient n: Number of individual structures For example, when measuring the reducibility of sintered ore, the reduction index specific to each individual structure regarding reducibility is determined, and the area ratio of the individual structures measured by image processing S 1 The reduction index P is determined from ~S o and the reduction index P 1 ~ P o of the individual organization using the above formula. The present invention will be explained in detail below. The properties of sintered ore measured by the method of the present invention include reducibility, reduction pulverizability, etc., but when measuring any of the properties, the structure of the sintered ore is classified into individual constituent structures and the above properties are determined. Alternatively, an index or value unique to each individual tissue regarding the main controlling factor of its properties is determined in advance. The following are examples of individual structures (mineral phases) according to this structure classification. (1) Fine hematite...Hematite particles are small,
Particles mainly constitute a diffusion bond network. (2) Secondary hematite...It is enlarged and crystallized in the slag pool. (3) Fine calcium ferrite: Calcium ferrite with a fine structure. (4) Acicular calcium ferrite: A structure in which microscopic calcium ferrite grows and takes on a needle shape. (5) Strip-shaped calcium ferrite: Formed by crystallization in slag pools. Needless to say, in addition to this structure (mineral phase), there are other structure parts such as pores and slag. In addition, magnetite structures may also be included, albeit in small amounts. The sintering temperature of recent sintered ores is controlled low in order to improve reducibility, and therefore the amount of magnetite in the product sintered ore is lower than that of conventional sintered ores. Therefore, in actual measurements, it is possible to exclude this magnetite structure from being classified as an individual structure. In the present invention, properties (or main controlling factors of properties) unique to each individual tissue classified in this way are determined. According to the studies of the present inventors, each individual structure constituting sintered ore has unique characteristics in terms of reducibility and reducibility to powder.
For example, in the case of individual structures according to the above classification, it has been confirmed that the reducibility improves in the order of fine calcium ferrite, fine hematite > needle-shaped calcium ferrite, and secondary hematite > strip-shaped calcium ferrite. In order to obtain the properties (or main controlling factors of properties) unique to each individual structure as described above, it is necessary to artificially synthesize each individual structure (mineral phase) as a single mineral phase. One method for synthesizing this single mineral phase is to quantitatively analyze the actual sintered ore structure using an X-ray microanalyzer, and synthesize the structure using a reagent based on the analysis results. In particular, when performing melt structure synthesis, the surrounding matrix composition of the mineral phase is also analyzed, and the quantitative ratio of both, temperature, holding time, atmosphere, etc. are determined using reagents. The table below shows an example of the synthesis conditions.
It has been confirmed by microscopic observation and X-ray diffraction that approximately 90% or more of each of the synthetic texture phases obtained by these methods is the target mineral phase.
微細型ヘマタイト（S1） ……30％
２次ヘマタイト（S2） ……10％
微細型カルシウムフエライト（S3） ……５％
針状カルシウムフエライト（S4） ……25％
短冊型カルシウムフエライト（S5） ……０％
20μ以上の気孔部（S6） ……12％
スラグ（S7） ……18％
P(RI)＝ａ（p1S1＋P2S2＋…＋p3＋S7）
＝72％
（実測値73％）
P(RDI)＝ａ（p1S1＋p2S2＋…＋p3S7）
＝40％
（実測値39％）
実施例 (3)
第６図に示す焼結鉱組織から試料を採取し、還
元指数P(RI)及び還元粉化率P(RDI)を測定した。その
際の各個別組織の面積比率及び得られた各性状指
数は以下の通りである。
〔面積比率〕
微細型ヘマタイト（S1） ……32.5％
２次ヘマタイト（S2） ……8.5％
微細型カルシウムフエライト（S3） ……4.3％
針状カルシウムフエライト（S4） ……27.8％
短冊型カルシウムフエライト（S5） ……2.3％
20μ以上の気孔部（S6） ……14.3％
スラグ（S7） ……10.3％
P(RI)＝ａ（p1S1＋p2S2＋…＋p7S7）
＝67.0％
（実測値68.5％）
P(RDI)＝ａ（p1S1＋p2S2＋…＋p7S7）
＝42.0％
（実測値40.8％）
以上述べた本発明によれば、被還元性及び還元
粉化性等の焼結鉱性状を迅速且つ正確に測定する
ことができ、実操業における焼結鉱性状管理に好
適なものであるということができる。
Fine hematite (S 1 ) ...30% Secondary hematite (S 2 ) ...10% Fine calcium ferrite (S 3 ) ...5% Acicular calcium ferrite (S 4 ) ...25% Strip-shaped calcium ferrite (S 5 ) ...0% Pores larger than 20μ (S 6 ) ...12% Slag (S 7 ) ...18% P (RI) = a (p 1 S 1 + P 2 S 2 +... + p 3 + S 7 ) = 72% (actual value 73%) P (RDI) = a (p 1 S 1 + p 2 S 2 +...+p 3 S 7 ) = 40% (actual value 39%) Example (3) Fig. 6 A sample was taken from the sintered ore structure shown in , and the reduction index P (RI) and reduction powdering rate P (RDI) were measured. The area ratio of each individual tissue and each property index obtained at that time are as follows. [Area ratio] Fine hematite (S 1 ) ...32.5% Secondary hematite (S 2 ) ...8.5% Fine calcium ferrite (S 3 ) ...4.3% Acicular calcium ferrite (S 4 ) ...27.8% Strip-shaped calcium ferrite (S 5 )...2.3% Pores of 20 μ or more (S 6 )...14.3% Slag (S 7 )...10.3% P (RI) = a (p 1 S 1 + p 2 S 2 + ...+p 7 S 7 ) = 67.0% (actual value 68.5%) P (RDI) = a (p 1 S 1 + p 2 S 2 +...+p 7 S 7 ) = 42.0% (actual value 40.8%) The book mentioned above According to the invention, sintered ore properties such as reducibility and reduced powdering property can be measured quickly and accurately, and it can be said that the invention is suitable for managing sintered ore properties in actual operations.
第１図は焼結鉱中個別組織の還元指数を示すも
のである。第２図は本発明により測定される係数
導入前の還元指数と実測値に基づく還元指数との
関係を示すものである。第３図は本発明により測
定される還元粉化率の支配因子たる残留歪と実測
値に基づく還元粉化指数との関係を示すものであ
る。第４図ないし第６図は本発明の実施例におけ
る試料の顕微鏡拡大写真である。
Figure 1 shows the reduction index of individual structures in sintered ore. FIG. 2 shows the relationship between the reduction index measured by the present invention before the introduction of the coefficient and the reduction index based on the actually measured value. FIG. 3 shows the relationship between the residual strain, which is a controlling factor of the reduction powdering rate measured by the present invention, and the reduction powdering index based on the actually measured value. 4 to 6 are enlarged microscopic photographs of samples in Examples of the present invention.
Claims (1)
鉱の組織を構成個別組織に分類し、各構成個別組
織の人工的に合成された単一鉱物相から上記性状
又は該性状の主たる支配因子に関する各個別組織
固有の指数又は値をあらかじめ求めておき、画像
処理により焼結鉱試料の上記各個別組織の面積比
率を測定し、下式により上記焼結鉱試料の特定性
状に関する性状指数Ｐを求めることを特徴とする
焼結鉱性状の測定方法。 但し、Ｐ：性状指数 Pi：特定性状又は該性状の主たる支配因子
に関する各個別組織固有の指数又は
値 Si：画像処理によつて求められた試料中各
個別組織の面積比率 ａ：係 数 ｎ：個別組織の数[Claims] 1. In measuring the specific properties of sintered ore, the structure of sintered ore is classified into constituent individual structures, and the above-mentioned single mineral phase is determined from the artificially synthesized single mineral phase of each constituent individual structure. The index or value specific to each individual structure regarding the properties or the main controlling factors of the properties is determined in advance, and the area ratio of each individual structure of the sintered ore sample is measured by image processing. A method for measuring properties of sintered ore, characterized by determining a property index P related to specific properties. However, P: Property index Pi: Index or value specific to each individual tissue regarding a specific property or the main controlling factor of the property Si: Area ratio of each individual tissue in the sample determined by image processing a: Coefficient n: Number of separate organizations
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3159383A JPS59157568A (en) | 1983-02-26 | 1983-02-26 | Method for measuring characteristic of sintered ore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3159383A JPS59157568A (en) | 1983-02-26 | 1983-02-26 | Method for measuring characteristic of sintered ore |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59157568A JPS59157568A (en) | 1984-09-06 |
| JPH0139550B2 true JPH0139550B2 (en) | 1989-08-22 |
Family
ID=12335484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3159383A Granted JPS59157568A (en) | 1983-02-26 | 1983-02-26 | Method for measuring characteristic of sintered ore |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59157568A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62119455A (en) * | 1985-11-20 | 1987-05-30 | Agency Of Ind Science & Technol | Refractory degree measurement of pottery stone |
| CN102721650B (en) * | 2012-06-13 | 2014-05-14 | 中国地质科学院矿产资源研究所 | Method and device for extracting mineral composition remote sensing information based on characteristic indexes |
| JP6094230B2 (en) * | 2013-01-18 | 2017-03-15 | 新日鐵住金株式会社 | Microscopic image analysis method for sintered ore |
| JP6844392B2 (en) * | 2017-04-11 | 2021-03-17 | 日本製鉄株式会社 | Evaluation method for reducing pulverization of sinter |
| JP7453532B2 (en) * | 2020-04-08 | 2024-03-21 | 日本製鉄株式会社 | Sintered ore structure learning device, structure structure learning method, and structure structure learning program, and sintered ore manufacturing condition changing device, manufacturing condition changing method, and manufacturing condition changing program |
-
1983
- 1983-02-26 JP JP3159383A patent/JPS59157568A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59157568A (en) | 1984-09-06 |
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