JPH0324235A - Method for simultaneous measurement of iron component, moisture and density of compounded raw material for sintering - Google Patents
Method for simultaneous measurement of iron component, moisture and density of compounded raw material for sinteringInfo
- Publication number
- JPH0324235A JPH0324235A JP1157017A JP15701789A JPH0324235A JP H0324235 A JPH0324235 A JP H0324235A JP 1157017 A JP1157017 A JP 1157017A JP 15701789 A JP15701789 A JP 15701789A JP H0324235 A JPH0324235 A JP H0324235A
- Authority
- JP
- Japan
- Prior art keywords
- gamma rays
- density
- raw material
- moisture
- iron
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 239000002994 raw material Substances 0.000 title claims abstract description 36
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 24
- 238000005259 measurement Methods 0.000 title claims description 10
- 238000000034 method Methods 0.000 title claims description 8
- 238000005245 sintering Methods 0.000 title abstract description 10
- 230000005251 gamma ray Effects 0.000 claims abstract description 19
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 14
- 150000001875 compounds Chemical class 0.000 claims description 16
- 239000000523 sample Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims 2
- 238000001228 spectrum Methods 0.000 abstract description 5
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 3
- 239000001257 hydrogen Substances 0.000 abstract description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 2
- 230000001681 protective effect Effects 0.000 abstract 1
- 230000005855 radiation Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 2
- HGLDOAKPQXAFKI-OUBTZVSYSA-N californium-252 Chemical compound [252Cf] HGLDOAKPQXAFKI-OUBTZVSYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 238000009614 chemical analysis method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、鉄鋼業において使用される焼結配合原料の鉄
分、水分、及び密度の測定方法に関するちのである．
（従来の技術）
従来焼結配合原料の鉄分は、化学的分析方法などにより
、また水分は赤外線方式などにより測定されている．焼
結配合原料の密度の測定に関しては、特開昭６３−４５
３２７． ４５３２８号公報、および特開昭６３− ２
４７３１８号公報において、ガンマ線を用いて計測する
方法が開示されている。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for measuring the iron content, moisture, and density of sintered compound raw materials used in the steel industry. (Prior art) Conventionally, the iron content of sintered compound raw materials has been measured using chemical analysis methods, and the moisture content has been measured using infrared methods. Regarding the measurement of the density of sintered compound raw materials, JP-A-63-45
327. Publication No. 45328, and JP-A-63-2
No. 47318 discloses a method of measuring using gamma rays.
（発明が解決しようとする課題）
ところで上記従来技術による測定は、測定の頻度も測定
の場所らそれぞれ異なっている。そのため，最終的に焼
結機のパレット上に装入された焼結配合原料の状態、す
なわち鉄分、水分、密度を同時に把握することが困難で
あり、パレット上下方向、幅方向の適切な装入制御の実
施に支障をきたしている．
本発明は、放射綿を利用した計測技術を融合することに
より、ｌカ所で連続的に上記諸量を測定し、適切な操業
を確保する測定方法を提供する．（問題点を解決するた
めの手段）
本発明は、中性子とガンマ線を放出する１個の放射性同
位元素線源（以下単に線源と称する）と、１台のガンマ
線検出器を装備した細長いプローブを焼結配合原料中に
挿入して、前記線源からのガンマ緯と原料との衝突によ
って生ずる散乱ガンマ線の量により原料の密度を測定す
ると共に、前記線源からの高速中性子が原料中の水分の
水素原子によって減速されて生ずる熱中性子が水素原子
に吸収されて発生する捕獲ガンマ線の量、および該熱中
性子が原料中の鉄分の鉄原子に吸収されて発生する捕獲
ガンマ線の量の両者の関係、ならびに前記原料の密度を
用い、水分、鉄分を同時に測定する焼結配合原料の鉄分
、水分、密度の同時測定方法である．
（作 用）
以下作用とと６に、図面により本発明を詳細に説明する
．
第１図において、中性子とガンマ練を放出する線源ｌ（
たとえばカリホルニウム２５２） ． Ｌ，＋へい２、
及びガンマ線検出器３を細長い保護管４に内蔵し、これ
を焼結配合原料５の中に挿入する．緯源１から放出され
る１次ガンマ線６は、焼結配合原料５と衝突し散乱ガン
マ線７となり、ガンマ線検出器３により検出される。一
方第２図において、線源１から放出される高速中性子８
は、水分の水素原子１２との複数回の衝突の後、熱中性
子９となる．この熱中性子９は別の水素原子１２に吸収
され、約２．２百万電子ボルトの捕獲ガンマ線１０を発
生する．またこの熱中性子９は鉄分の鉄原子１３に吸収
され、約７．６百万電子ボルトの捕獲ガンマ線ｌ１を発
生する．該捕獲ガンマ線ｌＯ、１ｌは、散乱ガンマ線７
と同様にガンマ線検出器３により検出される．
ガンマ線検出器３の信号を波高弁別器にかけることによ
り、第３図に示すエネルギーとガンマ綿検出数の関係を
意味するエネルギースペクトルｌ４を得る．該エネルギ
ースペクトル１４の中で、約０．２から０．５百万電子
ボルトの領域１５を前記散乱ガンマＡｉ７の検出に設定
し、約２．１から２．３百万電子ボルトの領域ｌ６を前
記捕獲ガンマ線１０の検出に設定し、約７．０から８．
０百万電子ボルトの領域を前記捕獲ガンマ線ｌ１の検出
に設定することにより、各々のガンマ線の検出数（第３
図の斜線の部分に対応）を求めることができる．
まず領域１５で観測されるガンマ線数によって、焼結配
合原料５の密度が第４図に示す密度と散乱ガンマ線の関
係ｌ８を用いて知れる．一般に関係ｌ８は実験によって
決定でき、検出数が大きいほど密度は小さくなる傾向を
利用する．この関係は、焼結配合原ｆ！４５の成分の通
常の変動には影響されないことが、製鐵所焼結工場での
テストによって判明している．
次に領域ｌ６で観洞されるガンマ線数は、焼結配合原料
５の中の単位体積当たりに含まれる水素原子ｌ２の数に
関する関係を有する．しかし同数の水素原子ｌ２が存在
しても、単位体積当たりの原料重量すなわち密度が異な
ると、水分に換算した時の重量％（以下ｗｔ％）が異な
る．したがって最初に求めた密度に対応する検量線の関
係１９を用い、水分を求める手続きをとる．この関係は
第５図に示される．ガンマ線検出数が同じなら密度が小
さい方が水分のｗｔ％は大きくなる．同様に領域１７で
観測されるガンマ線数は、焼結配合原料５の中の単位体
積当たりに含まれる鉄原子１３の数に関する関係を有す
る。しかし同数の鉄原子ｌ３が存在しても、単位体積当
たりの原料重量すなわち密度が異なると、鉄分に換算し
た時のｗｔ％が異なる．さらに水分によって熱中性子の
発生量が変動する．すなわち水分が多いほど熱中性子の
数が増し、その結果、同じ鉄原子１３が存在してもガン
マ綿数は増加する．それゆえ第６図に示すように鉄分と
鉄原子からの捕獲ガンマ線の数の関係２０は水分を変化
させて求める．捕獲ガンマ線検出数に対する密度の影響
は、鉄からの捕獲ガンマ線ｌ１が高いエネルギーであり
、発生から検出器３までの距離が１０から２０ｃｍ程度
であるので無視できる．
以上の作用によって焼結配合原料５中の密度、水分，鉄
分が同一場所で連続的に測定できるようになる．
（実施例）
操業中の焼結工場での実施例を示す．
カリホルニウム２５２の３．７メガベクレル（１００マ
イクロキューリー）線源と、径２０ｍｍ、長さ１００ｍ
ｍのビスマスジャーマネート検出器を装備した径３５ｍ
ｍのプローブを焼結配合原料中に挿入し、１００秒の計
測で密度１．８５±０．０５ｇ／ｃｍ” ．水分は上記
密度のちとで６．０±ｌ．Ｏｗｔ％、鉄分は上記密度、
水分の６とで５０．６±３．５ｗｔ％の値を得、十分実
用に耐えることを実証した．現在２本が連続的に実ライ
ンで使用されている．
（発明の効果）
以上説明したごとく本発明による測定方法は、放射線を
利用することにより、パレット上に装入した焼結配合原
料に対して、従来の密度に加えて鉄分、水分をｌカ所の
測定点で同時にかつ連続的に測定できるものであり、装
入直後の原料を正確に把握することにより、迅速かつ適
切な原料装入制御を可能とするものであり，焼結鉱の品
質維持と生産性の向上に資するものである。(Problems to be Solved by the Invention) In the measurements according to the above-mentioned prior art, the frequency of measurement also differs depending on the location of measurement. Therefore, it is difficult to simultaneously grasp the state of the sintered compound raw materials finally charged onto the pallet of the sintering machine, that is, the iron content, moisture, and density. This is interfering with the implementation of control. The present invention provides a measurement method that continuously measures the above-mentioned quantities at one location and ensures proper operation by combining measurement technology using radiation cotton. (Means for Solving the Problems) The present invention uses a long and thin probe equipped with one radioisotope source (hereinafter simply referred to as a radiation source) that emits neutrons and gamma rays and one gamma ray detector. The density of the raw material is measured by the gamma latitude from the source and the amount of scattered gamma rays generated by collision with the raw material. The relationship between the amount of captured gamma rays generated when thermal neutrons generated by being decelerated by hydrogen atoms are absorbed by hydrogen atoms, and the amount of captured gamma rays generated when the thermal neutrons are absorbed by iron atoms of iron in the raw material, This is also a method for simultaneously measuring the iron content, water content, and density of a sintered blended raw material, in which the moisture content and iron content are simultaneously measured using the density of the raw material. (Function) The present invention will be explained in detail below with reference to the drawings. In Figure 1, a radiation source l(
For example, californium 252). L, + Hei 2,
A gamma ray detector 3 and a gamma ray detector 3 are built into a long and narrow protection tube 4, and this is inserted into a sintering compound raw material 5. The primary gamma rays 6 emitted from the lattice source 1 collide with the sintering compound raw material 5 and become scattered gamma rays 7, which are detected by the gamma ray detector 3. On the other hand, in FIG. 2, fast neutrons 8 emitted from the radiation source 1
becomes a thermal neutron 9 after multiple collisions with hydrogen atoms 12 of water. This thermal neutron 9 is absorbed by another hydrogen atom 12 and generates captured gamma rays 10 of approximately 2.2 million electron volts. Furthermore, this thermal neutron 9 is absorbed by iron atoms 13 of iron, and generates captured gamma rays l1 of about 7.6 million electron volts. The captured gamma rays 1O, 1l are scattered gamma rays 7
Similarly, it is detected by gamma ray detector 3. By applying the signal from the gamma ray detector 3 to a pulse height discriminator, an energy spectrum l4 indicating the relationship between energy and the number of detected gamma rays shown in FIG. 3 is obtained. In the energy spectrum 14, a region 15 of about 0.2 to 0.5 million electron volts is set for detection of the scattered gamma Ai7, and a region 16 of about 2.1 to 2.3 million electron volts is set. Set to detect the captured gamma rays 10, about 7.0 to 8.
By setting the region of 0 million electron volts for the detection of the captured gamma rays l1, the number of detected gamma rays (third
(corresponding to the shaded area in the figure) can be found. First, based on the number of gamma rays observed in the region 15, the density of the sintered compound raw material 5 is known using the relationship l8 between density and scattered gamma rays shown in FIG. In general, the relationship 18 can be determined by experiment, making use of the tendency that the density decreases as the number of detections increases. This relationship is based on the sintering compound f! Tests at the steelworks sintering plant have shown that it is not affected by normal variations in the 45 components. Next, the number of gamma rays observed in the region 16 has a relationship with the number of hydrogen atoms 12 contained per unit volume in the sintered compound raw material 5. However, even if the same number of hydrogen atoms l2 are present, if the weight of the raw material per unit volume, that is, the density, differs, the weight percent (hereinafter referred to as wt%) when converted to water will differ. Therefore, use the calibration curve relationship 19 corresponding to the initially determined density to determine the moisture content. This relationship is shown in Figure 5. If the number of gamma rays detected is the same, the lower the density, the higher the wt% of water. Similarly, the number of gamma rays observed in the region 17 has a relationship with the number of iron atoms 13 contained per unit volume in the sintered compound raw material 5. However, even if the same number of iron atoms l3 are present, if the weight of the raw material per unit volume, that is, the density, differs, the wt% when converted to iron content will differ. Furthermore, the amount of thermal neutrons generated varies depending on the moisture content. In other words, the more water there is, the more thermal neutrons there are, and as a result, the number of gamma cotton increases even if the same 13 iron atoms are present. Therefore, as shown in Figure 6, the relationship 20 between iron content and the number of gamma rays captured from iron atoms is determined by varying the water content. The influence of density on the number of captured gamma rays detected can be ignored because the captured gamma rays l1 from iron have high energy and the distance from the source to the detector 3 is about 10 to 20 cm. Due to the above actions, the density, moisture, and iron content in the sintered compound raw material 5 can be measured continuously at the same location. (Example) An example of a sintering factory in operation is shown below. A 3.7 megabecquerel (100 microcurie) radiation source of californium 252 with a diameter of 20 mm and a length of 100 m.
35m diameter equipped with bismuth germanate detector
Insert a probe of m into the sintered compound raw material and measure for 100 seconds to find a density of 1.85±0.05g/cm''.The moisture content is 6.0±l.Owt% after the above density, and the iron content is at the above density. ,
A value of 50.6 ± 3.5 wt% was obtained for the water content of 6, demonstrating that it is sufficiently durable for practical use. Currently, two are being used continuously on the actual line. (Effects of the Invention) As explained above, the measuring method according to the present invention uses radiation to measure the iron content and moisture in 1 locations in addition to the conventional density of the sintered compounded raw materials charged on the pallet. It enables simultaneous and continuous measurement at measurement points, and by accurately understanding the raw material immediately after charging, it enables quick and appropriate raw material charging control, which helps maintain the quality of sintered ore. This contributes to improving productivity.
第１図、第２図は放射線源を内蔵したプロープにより焼
結配合原料の測定をおこなう方法を説明する図面であり
、第１図は原料の密度、第２図は水分、鉄分の測定を説
明する図面、第３図はガンマ線のエネルギーと検出され
た数の関係をしめずエネルギースペクトル図、第４図は
原料の密度と散乱ガンマ線数との関係図、第５図は水分
と水素の捕獲ガンマ線数との関係図、第６図は鉄分と鉄
の捕獲ガンマ線数との関係図である．
１・・・中性子・ガンマ線源、２・・・しやへい、３・
・・ガンマ線検出器、４・・・保護管、５・・・焼結配
合原料、６・・・１次ガンマ線、７・・・散乱ガンマ線
、８・・・高速中性子、９・・・熱中性子、１０・・・
水素からの捕獲ガンマ線、１１・・・鉄からの捕獲ガン
マ線、ｌ２・・・水素原子、１３、鉄原子、１４・・・
エネルギースペクトル、１５・・・散乱ガンマ線領域、
１６・・・水素原子からのガンマ線領域、ｌ７・・・鉄
原子からのガンマ線領域、ｌ８・・・密度と散乱ガンマ
線検出数の関係、ｌ９・・・水分と水素原子からの捕獲
ガンマ線検出数の関係、２０・・・鉄分と鉄原子からの
捕獲ガンマ線検出数の関係
弁Ｉ図Figures 1 and 2 are diagrams explaining the method of measuring sintered compound raw materials using a probe with a built-in radiation source. Figure 1 explains the density of the raw materials, and Figure 2 explains the measurement of moisture and iron content. Figure 3 is an energy spectrum diagram showing the relationship between gamma ray energy and the number of detected gamma rays, Figure 4 is a diagram showing the relationship between raw material density and the number of scattered gamma rays, and Figure 5 is a diagram showing the captured gamma rays of moisture and hydrogen. Figure 6 is a diagram showing the relationship between iron content and the number of gamma rays captured by iron. 1... Neutron/gamma ray source, 2... Shiyahei, 3...
... Gamma ray detector, 4... Protection tube, 5... Sintering compound raw material, 6... Primary gamma ray, 7... Scattered gamma ray, 8... Fast neutron, 9... Thermal neutron , 10...
Gamma ray captured from hydrogen, 11... Gamma ray captured from iron, l2... Hydrogen atom, 13, Iron atom, 14...
Energy spectrum, 15...scattered gamma ray region,
16... Gamma ray region from hydrogen atoms, l7... Gamma ray region from iron atoms, l8... Relationship between density and number of detected scattered gamma rays, l9... Number of detected captured gamma rays from moisture and hydrogen atoms Relationship, 20... Relationship valve I diagram between iron content and the number of detected gamma rays captured from iron atoms
Claims (1)
と、１台のガンマ線検出器を装備した細長いプロープを
焼結配合原料中に挿入して、前記線源からのガンマ線と
原料との衝突によって生ずる散乱ガンマ線の量により原
料の密度を測定すると共に、前記線源からの高速中性子
が原料中の水分の水素原子によって減速されて生ずる熱
中性子が水素原子に吸収されて発生する捕獲ガンマ線の
量、および該熱中性子が原料中の鉄分の鉄原子に吸収さ
れて発生する捕獲ガンマ線の量の両者の関係、ならびに
前記原料の密度を用い、水分、鉄分を同時に測定する焼
結配合原料の鉄分、水分、密度の同時測定方法。An elongated probe equipped with a radioisotope source that emits neutrons and gamma rays and a gamma ray detector is inserted into the sintered compound material, and the gamma rays from the source collide with the material. The density of the raw material is measured by the amount of scattered gamma rays generated, and the amount of captured gamma rays generated when the fast neutrons from the source are slowed down by hydrogen atoms in the moisture in the raw material and thermal neutrons are absorbed by the hydrogen atoms. The relationship between the amount of captured gamma rays generated when the thermal neutrons are absorbed by iron atoms in the raw material, and the density of the raw material to simultaneously measure the moisture and iron content of the sintered compound raw material. , a method for simultaneous measurement of density.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1157017A JPH0774395B2 (en) | 1989-06-20 | 1989-06-20 | Simultaneous measurement of iron content, water content, and density of sintering compound raw materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1157017A JPH0774395B2 (en) | 1989-06-20 | 1989-06-20 | Simultaneous measurement of iron content, water content, and density of sintering compound raw materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0324235A true JPH0324235A (en) | 1991-02-01 |
| JPH0774395B2 JPH0774395B2 (en) | 1995-08-09 |
Family
ID=15640362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1157017A Expired - Fee Related JPH0774395B2 (en) | 1989-06-20 | 1989-06-20 | Simultaneous measurement of iron content, water content, and density of sintering compound raw materials |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0774395B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0545784A2 (en) * | 1991-11-29 | 1993-06-09 | Troxler Electronic Laboratories, Inc. | Apparatus and method for detecting subterranean leakage from a large storage vessel |
| JP2011523577A (en) * | 2008-06-04 | 2011-08-18 | チェック−キャップ リミテッド | Apparatus and method for imaging tissue |
| CN112313504A (en) * | 2018-06-21 | 2021-02-02 | 澳洲快索有限公司 | System and method for humidity measurement |
| CN112313504B (en) * | 2018-06-21 | 2024-04-26 | 澳洲快索有限公司 | System and method for humidity measurement |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6345327A (en) * | 1986-08-12 | 1988-02-26 | Nippon Steel Corp | Method for controlling charging of raw material to sintering machine |
| JPS6345328A (en) * | 1986-08-12 | 1988-02-26 | Nippon Steel Corp | Method for controlling charging of raw material to sintering machine |
| JPS6362694A (en) * | 1986-09-02 | 1988-03-18 | 株式会社 スギノマシン | Small-diameter hole processing equipment |
| JPS63247318A (en) * | 1987-04-02 | 1988-10-14 | Nippon Steel Corp | Method for charging sintering raw material |
-
1989
- 1989-06-20 JP JP1157017A patent/JPH0774395B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6345327A (en) * | 1986-08-12 | 1988-02-26 | Nippon Steel Corp | Method for controlling charging of raw material to sintering machine |
| JPS6345328A (en) * | 1986-08-12 | 1988-02-26 | Nippon Steel Corp | Method for controlling charging of raw material to sintering machine |
| JPS6362694A (en) * | 1986-09-02 | 1988-03-18 | 株式会社 スギノマシン | Small-diameter hole processing equipment |
| JPS63247318A (en) * | 1987-04-02 | 1988-10-14 | Nippon Steel Corp | Method for charging sintering raw material |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0545784A2 (en) * | 1991-11-29 | 1993-06-09 | Troxler Electronic Laboratories, Inc. | Apparatus and method for detecting subterranean leakage from a large storage vessel |
| JP2011523577A (en) * | 2008-06-04 | 2011-08-18 | チェック−キャップ リミテッド | Apparatus and method for imaging tissue |
| CN112313504A (en) * | 2018-06-21 | 2021-02-02 | 澳洲快索有限公司 | System and method for humidity measurement |
| CN112313504B (en) * | 2018-06-21 | 2024-04-26 | 澳洲快索有限公司 | System and method for humidity measurement |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0774395B2 (en) | 1995-08-09 |
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