JPH0639626B2 - Sintered ore manufacturing method - Google Patents
Sintered ore manufacturing methodInfo
- Publication number
- JPH0639626B2 JPH0639626B2 JP62303230A JP30323087A JPH0639626B2 JP H0639626 B2 JPH0639626 B2 JP H0639626B2 JP 62303230 A JP62303230 A JP 62303230A JP 30323087 A JP30323087 A JP 30323087A JP H0639626 B2 JPH0639626 B2 JP H0639626B2
- Authority
- JP
- Japan
- Prior art keywords
- binder
- powder
- raw material
- coke
- ore
- 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.)
- Expired - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 19
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 50
- 239000011230 binding agent Substances 0.000 claims description 35
- 239000000843 powder Substances 0.000 claims description 33
- 239000002994 raw material Substances 0.000 claims description 26
- 235000012255 calcium oxide Nutrition 0.000 claims description 25
- 239000000292 calcium oxide Substances 0.000 claims description 25
- 235000019738 Limestone Nutrition 0.000 claims description 18
- 239000000571 coke Substances 0.000 claims description 18
- 239000006028 limestone Substances 0.000 claims description 18
- 238000005245 sintering Methods 0.000 claims description 12
- 239000010410 layer Substances 0.000 claims description 8
- 239000002344 surface layer Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 11
- 239000000047 product Substances 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 7
- 238000002156 mixing Methods 0.000 description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 238000013329 compounding Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、焼結鉱の製造方法に関し、更に詳しくは、焼
結用バインダを焼結過程において安価に製造した焼結鉱
製造コストの低廉化を図かる製造方法に関する。Description: TECHNICAL FIELD The present invention relates to a method for producing a sinter, and more specifically, a sinter producing cost which is produced inexpensively in a sintering process of a binder for sintering. The present invention relates to a manufacturing method for achieving the same.
〔従来の技術〕 焼結操業の模式図を第６図に示す。床敷ホッパ３からパ
レット１上に切出された床敷鉱の上に給鉱ホッパ４から
切出された原料２を積層して供給する。原料２は点火装
置１５で点火されメインブロワ１４の通風により原料中
の粉コークスは燃焼し、原料２は焼成され焼結鉱とな
る。焼結鉱は粉砕機５で粉砕され、クーラ６で冷却され
た後、篩７で分級される。篩上の粒径８〜１６ｍｍの成
品は床敷鉱１０として床敷ホッパ３に戻され、残余は製
品１３として高炉に搬送される。分級され粒径−５ｍｍ
以下のものは返鉱１１としてミキサ８によって新原料１
２と混合された後給鉱ホッパ４に戻される。一般にパレ
ット上の原料２の通気性を改善する手段として、バイン
ダを原料中に混入させることがある。バインダとしては
普通生石灰（ＣａＯ）がよく用いられている。[Prior Art] A schematic view of the sintering operation is shown in FIG. The raw material 2 cut out from the feed hopper 4 is stacked and supplied on the bedding ore cut out from the bedding hopper 3 onto the pallet 1. The raw material 2 is ignited by the igniter 15 and the powder coke in the raw material is burned by the ventilation of the main blower 14, and the raw material 2 is fired and becomes a sintered ore. The sinter is crushed by the crusher 5, cooled by the cooler 6, and then classified by the sieve 7. The product having a particle size of 8 to 16 mm on the sieve is returned to the bedding hopper 3 as a bedding ore 10, and the rest is conveyed to the blast furnace as a product 13. Classified particle size-5mm
The following is a new raw material 1 by the mixer 8 as return ore 11.
After being mixed with 2, it is returned to the feed hopper 4. Generally, as a means for improving the air permeability of the raw material 2 on the pallet, a binder may be mixed into the raw material. Common quicklime (CaO) is often used as a binder.
このＣａＯを安価に製造し利用する方法として、特開昭
５８−１３３３３１号には石灰（ＣａＯ）粉９を石灰用
ホッパ１９により切り出し、原料２の最上部に積層させ
点火装置１５内の熱によって石灰粉を生石灰粉（Ｃａ
Ｏ）とし、篩７により返鉱１１とともに回収し、バイン
ダとして利用する方法が提案されている。As a method for inexpensively producing and utilizing this CaO, in Japanese Patent Laid-Open No. 58-133331, lime (CaO) powder 9 is cut out by a lime hopper 19 and stacked on top of the raw material 2 by heat in the ignition device 15. Lime powder is quicklime powder (Ca
O), and a method of recovering it together with the return ore 11 with the sieve 7 and using it as a binder is proposed.
しかし、この方法では、 篩７での製品１３と返鉱１１との分離が完全でなく、
製品１３中にバインダが混入する。However, in this method, the separation of the product 13 and the return ore 11 on the sieve 7 is not complete,
The binder is mixed in the product 13.
クーラ６での通風冷却によって、製造されたバインダ
の一部が飛散する。A part of the manufactured binder is scattered by the ventilation cooling by the cooler 6.
点火装置１５だけでは完全にＣａＯに分解せず、バイ
ンダとしてＣａＯへの転化率が不十分である。The ignition device 15 alone does not completely decompose into CaO, and the conversion rate to CaO as a binder is insufficient.
等の問題がある。There is a problem such as.
上述したように従来の方法にはバインダの回収歩留りが
低い、ＣａＯへの転化率が低い、製品中にバインダが混
入する等の問題があった。製品にバインダが混入すると
ＣａＯ％をはじめとする焼結鉱の化学成分が目標値とず
れ、ばらつきも大きくなり品質上大きな問題となる。As described above, the conventional methods have problems such as a low binder recovery yield, a low conversion rate to CaO, and the inclusion of binder in the product. When the binder is mixed in the product, the chemical composition of the sinter, such as CaO%, deviates from the target value and the dispersion becomes large, which causes a serious problem in quality.
本発明は上述の問題点を解決するために提案されたもの
であり、 製品焼結鉱との分離が完全で製品の化学成分に影響を
与えない。The present invention has been proposed to solve the above-mentioned problems, and the separation from the product sinter is complete and does not affect the chemical composition of the product.
バインダとしてＣａＯへの転化率が高い。The conversion rate to CaO as a binder is high.
バインダの回収歩留りが高い。Binder recovery yield is high.
上述のようなバインダを副生する焼結鉱の製造方法を提
供することを目的とするものである。It is an object of the present invention to provide a method for producing a sinter that produces a binder as described above.
本発明は上述の問題点を解決するもので、焼結機パレッ
ト上の最上層に粉コークスと石灰石粉を装入して焼結を
行い、生成した生石灰粉を焼結用バインダとして供給す
る焼結鉱の製造方法に適用され、次の技術手段を採っ
た。すなわち、 粉コークスを石灰石粉中に７％〜２０％混合して焼結
し、排鉱部近傍で表層の生石灰粉をスクレーパで掻上げ
分離して吸引回収した後、これを焼結原料供給ホッパに
供給する方法である。The present invention solves the above-mentioned problems, in which the coke powder and limestone powder are charged into the uppermost layer on the sinter machine pallet and sintered, and the produced quicklime powder is supplied as a sintering binder. It was applied to the production method of mine and the following technical measures were taken. That is, powder coke is mixed with limestone powder in an amount of 7% to 20% and sintered, and the quick lime powder in the surface layer is scraped up with a scraper and separated by suction in the vicinity of the mine ore, and then this is fed into a sintering raw material supply hopper. It is a method of supplying to.
本発明は、点火装置だけではなく粉コークスの燃焼熱を
も利用するので、ＣａＯへの転化率が高く、また生成さ
れたバインダは比重の大小を利用してスクレーパ、ブロ
ワ等によりパレット上で回収するので篩で分級する方法
と比較してバインダの回収歩留は大幅に向上するので焼
結鉱製造コストを低廉化することができる。Since the present invention utilizes not only the ignition device but also the combustion heat of powder coke, the conversion rate to CaO is high, and the generated binder is recovered on a pallet by a scraper, a blower, etc. by utilizing the magnitude of specific gravity. Therefore, the binder recovery yield is significantly improved as compared with the method of classifying with a sieve, so that the production cost of the sinter can be reduced.
石灰石粉中の粉コークス配合率とＣａＯ転化率の関係を
鍋試験によって求めた結果を第２図に示す。第２図によ
れば、配合率５％で転化率９７％を示しており、これ以
上配合率を増加しても転化率は殆ど変らない。かと云っ
て２０％を超えると過剰となり燃残りが発生しコストア
ップとなるので上限は２０％が限度である。また、逆に
配合率が５％以下では石灰層下の配合原料に着火しな
い。従って、粉コークス配合率としては５％〜２０％と
するが７％〜２０％が最適である。FIG. 2 shows the results of the relationship between the powder coke blending ratio in the limestone powder and the CaO conversion ratio obtained by a pan test. According to FIG. 2, the conversion rate is 97% at the compounding rate of 5%, and the conversion rate hardly changes even if the compounding rate is further increased. However, if it exceeds 20%, it will be excessive and unburned residue will occur, which will increase the cost, so the upper limit is 20%. On the contrary, if the blending ratio is 5% or less, the blended raw material below the lime layer does not ignite. Therefore, the powder coke blending ratio is set to 5% to 20%, but 7% to 20% is optimal.
第１図は本発明を好適に実施できる、焼結鉱の製造装置
の説明図を示している。給鉱ホッパ４と点火装置１５の
間に石灰石用ホッパ１９を設置する。石灰石用ホッパ１
９に石灰石粉９と粉コークス１８を混合して装入し、石
灰石用ホッパ１９から原料２の上に積層して切出す。点
火装置１５で点火され、粉コークスが燃焼して石灰石粉
が熱分解されて生石灰（ＣａＯ）となる。FIG. 1 shows an explanatory view of a sinter production apparatus capable of suitably implementing the present invention. A limestone hopper 19 is installed between the mining hopper 4 and the ignition device 15. Hopper for limestone 1
The limestone powder 9 and the powder coke 18 are mixed and charged in 9, and the limestone hopper 19 is stacked on the raw material 2 and cut out. It is ignited by the ignition device 15, the coke powder is burned, and the limestone powder is thermally decomposed into quick lime (CaO).
排鉱部２６の手前にフード２１とスクレーパ２２を設置
する。スクレーパ２２により原料２の上部をかきあげブ
ロワ２５によって生石灰を吸引する。吸引された生石灰
粉はサイクロン２４により捕集されホッパ２０に貯留さ
れる。この場合、燃焼した粉コークスも同時に吸引され
るが操業上は何ら問題はない。The hood 21 and the scraper 22 are installed in front of the mining section 26. The scraper 22 scrapes the upper part of the raw material 2 and the blower 25 sucks quicklime. The sucked quicklime powder is collected by the cyclone 24 and stored in the hopper 20. In this case, the burned powder coke is also sucked at the same time, but there is no problem in operation.
ホッパ２０で回収後、配合槽２７内のバインダ用ホッパ
１６に装入され、他の新原料、石灰石粉９、返鉱１１、
粉コークス１８の各槽から切出される原料とミキサ８で
混合され、給鉱ホッパ４に装入しパレット１上に供給さ
れる。After being collected by the hopper 20, it is loaded into the binder hopper 16 in the mixing tank 27, and other new raw materials, limestone powder 9, returned ore 11,
The raw material cut out from each tank of the powder coke 18 is mixed in the mixer 8, charged into the feed hopper 4, and supplied onto the pallet 1.
なお、石灰石用ホッパ１９には、石灰石粉９と粉コーク
ス１８の一部がミキサ２８で混合後装入され、パレット
上原料２の最上層に供給される。３は床敷ホッパで、焼
結鉱成品中の所定粒度のものを受入れ、床敷鉱としてパ
レットの最下層に供給されるものである。The limestone hopper 19 is charged with the limestone powder 9 and a part of the powder coke 18 after mixing with the mixer 28, and is supplied to the uppermost layer of the pallet raw material 2. A bedding hopper 3 receives a sinter ore product having a predetermined grain size and supplies it as a bedding ore to the lowermost layer of the pallet.
第３図はパレット１上での原料２の積層状況の説明図で
あり、配合原料２９の上に石灰石粉９と粉コークス１８
が混合され積層されている様子を示している。FIG. 3 is an explanatory view of the stacking state of the raw material 2 on the pallet 1, in which the limestone powder 9 and the coke 18 are placed on the mixed raw material 29.
It is shown that the are mixed and laminated.
焼結鉱生産量６７００〜６９００（dry-t/day）、新原
料使用量（コークス床敷鉱、返鉱を除く）７２００〜７
５００（dry-t/day）のＤＬ式焼結機において、バイン
ダ用ＣａＯ配合率1.0％（対新原料）、石灰石粉中の粉
コークス配合率5.5％、焼結鉱目標ＣａＯ％9.5％の生産
前提で、バインダなしの場合、バインダを添加した従来
法と本発明法の場合の各操業を１ヶ月ずつ実施した。こ
の操業状況を第１表に示している。Sintered ore production 6700-6900 (dry-t / day), new raw material usage (excluding coke bedding or return) 7200-7
Production of a CaO compounding ratio of 1.0% for binder (compared to new raw materials), a coke compounding ratio of 5.5% in limestone powder, and a target CaO% of CaO 9.5% for sinter in a 500 (dry-t / day) DL sintering machine Assuming that there is no binder, each operation in the conventional method in which a binder is added and in the method of the present invention is carried out for one month. This operation status is shown in Table 1.
バインダを製造、添加することにより、パレット上原料
層の通気性が向上し、層厚を厚くすることができる。そ
の結果排ガス顕熱がより有効に利用され、焼結鉱１ｔ当
たりのコークス原単位を減少させることができた。本発
明は従来法に比較し層厚を３０ｍｍ増し、コークス原単
位を５（ｋｇ／ｔ−焼結鉱）低減させることができた。By manufacturing and adding the binder, the air permeability of the raw material layer on the pallet can be improved and the layer thickness can be increased. As a result, the sensible heat of the exhaust gas was used more effectively, and the coke unit consumption per 1 t of the sintered ore could be reduced. The present invention was able to increase the layer thickness by 30 mm and reduce the coke unit consumption by 5 (kg / t-sintered ore) as compared with the conventional method.
また、副生バインダの製造状況の比較を第２表に示す。
従来法（特開昭５８−１３３３３１号）では、バインダ
がクーラで飛散したり、製品中に混入するため原料石灰
粉に対するバインダの歩留は約８１％で低い。それに対
し、本発明では歩留は９８％に向上しバインダは殆ど回
収できた。また、バインダ中のＣａＯ％も、従来法では
８５％であるに対し、本発明では９７％と大幅に向上し
た。このように本発明工程におけるバインダの製造状況
は、従来例に比べ質、量とも優れているので焼結操業で
の通気性改善効果も大幅に向上した。Table 2 shows a comparison of the production status of the by-product binder.
In the conventional method (Japanese Patent Laid-Open No. 58-133331), the binder is scattered in the cooler or mixed in the product, so that the yield of the binder with respect to the raw lime powder is low at about 81%. On the other hand, in the present invention, the yield was improved to 98%, and the binder was almost recovered. Further, the CaO% in the binder was 85% in the conventional method, but was significantly improved to 97% in the present invention. As described above, the binder production in the process of the present invention is superior in quality and quantity compared to the conventional example, so that the effect of improving the air permeability in the sintering operation is also greatly improved.
また、従来法で最大の問題になっていた焼結鉱中のＣａ
Ｏ％の目標値（9.5％）からの偏差Δの推移を第５図
に、日間変動σｘの推移を第６図にそれぞれ本発明と比
較してグラフに示している。 In addition, Ca in the sintered ore, which was the biggest problem in the conventional method,
The change in the deviation Δ from the target value of O% (9.5%) is shown in FIG. 5, and the change in the daily fluctuation σx is shown in a graph in comparison with the present invention.
篩によって分級する従来法のバインダ製造、点火操業で
は上述の偏差、変動とも増大するが、本発明法では吸引
方式であるので、比重の大きい鉱石と比重の小さい石灰
石粉との比重差を利用できるため回収効率が良いのでバ
インダを使用しない通常操業とほぼ同じ管理精度が得ら
れている。Although the above-mentioned deviations and fluctuations increase in the binder production and ignition operation of the conventional method of classifying with a sieve, since the method of the present invention is a suction method, it is possible to use the difference in specific gravity between ore having a large specific gravity and limestone powder having a small specific gravity. Therefore, the recovery efficiency is good, and the management accuracy is almost the same as the normal operation without using the binder.
以上説明したように本発明によれば焼結用副生バインダ
（ＣａＯ）を焼結過程において安価に製造しそれを回収
利用することにより、通気性が改善され、コークス原単
位を５（ｋｇ／ｔ−焼結鉱）下げる事が可能になった。
さらに、従来の副生バインダの製造で問題となっていた
焼結中ＣａＯ％の管理精度も大幅に改善されバインダを
使用しない場合と同程度となった。本発明は高炉用原料
としての焼結鉱製造コストの低減に優れた効果を奏す
る。As described above, according to the present invention, by producing the sintering by-product binder (CaO) at a low cost in the sintering process and recovering and utilizing the binder, the air permeability is improved, and the coke consumption rate is 5 (kg / kg / unit). It became possible to lower the (t-sintered ore).
Further, the control accuracy of CaO% during sintering, which has been a problem in the production of the conventional by-product binder, has been greatly improved, and is about the same as when the binder is not used. INDUSTRIAL APPLICABILITY The present invention has an excellent effect in reducing the production cost of a sintered ore as a raw material for a blast furnace.
第１図は本発明を好適に使用することができる焼結鉱の
製造工程の説明図、第２図は本発明の原理説明図、第３
図は本発明の原料等の積層状況説明図、第４図および第
５図は従来例との比較を示すグラフであり、第４図はＣ
ａＯ％偏差、第５図は日間変動である。第６図は従来例
の焼結鉱の製造工程の説明図である。 １……パレット、２……原料 ３……床敷ポッパ、４……給鉱ポッパ ５……粉砕機、６……クーラ ７……篩、８……ミキサ ９……石灰石粉、１０……床敷鉱 １１……返鉱、１２……新原料 １３……製品、１４……ブロワ １５……点火装置、１６……バインダ用ポッパ １８……粉コークス、１９……石灰石用ポッパ ２０……ポッパ、２１……フード ２２……スクレーパ、２４……サイクロン ２５……ブロワ、２６……排鉱部 ２７……混合槽、２８……ミキサ ２９……配合原料FIG. 1 is an explanatory view of a manufacturing process of a sintered ore in which the present invention can be preferably used, FIG. 2 is an explanatory view of the principle of the present invention, and FIG.
FIG. 4 is a diagram for explaining a stacking state of raw materials and the like of the present invention, FIGS. 4 and 5 are graphs showing comparison with a conventional example, and FIG.
The aO% deviation, FIG. 5 is the daily variation. FIG. 6 is an explanatory view of a manufacturing process of a conventional sintered ore. 1 ... Pallet, 2 ... Raw material 3 ... Bedding popper, 4 ... Mining popper 5 ... Crusher, 6 ... Cooler, 7 ... Sieve, 8 ... Mixer, 9 ... Limestone powder, 10 ... Bed ore 11 …… Return ore, 12 …… New raw material 13 …… Product, 14 …… Blower 15 …… Ignition device, 16 …… Binder popper 18 …… Powder coke, 19 …… Limestone popper 20 …… Popper, 21 ... Hood 22 ... Scraper, 24 ... Cyclone 25 ... Blower, 26 ... Mining section 27 ... Mixing tank, 28 ... Mixer 29 ... Blended raw material
Claims (1)
石灰石粉を装入して焼結を行い、生成した生石灰粉を焼
結用バインダとして供給する焼結鉱の製造方法におい
て、 前記粉コークスを石灰石粉中に７％〜２０％混合して焼
結し、排鉱部近傍で表層の生石灰粉をスクレーパで掻上
げ分離して吸引回収した後、これを焼結原料供給ホッパ
に供給することを特徴とする焼結鉱の製造方法。1. A method for producing a sintered ore, in which powdered coke and limestone powder are charged into the uppermost layer on a sinter machine pallet and sintered, and the produced quicklime powder is supplied as a binder for sintering. Powder coke is mixed with limestone powder in an amount of 7% to 20% and sintered, and quick lime powder in the surface layer is scraped up with a scraper and separated by suction in the vicinity of the mine ore, and then supplied to the sintering raw material supply hopper. A method for producing a sinter, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62303230A JPH0639626B2 (en) | 1987-12-02 | 1987-12-02 | Sintered ore manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62303230A JPH0639626B2 (en) | 1987-12-02 | 1987-12-02 | Sintered ore manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01147023A JPH01147023A (en) | 1989-06-08 |
| JPH0639626B2 true JPH0639626B2 (en) | 1994-05-25 |
Family
ID=17918445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62303230A Expired - Lifetime JPH0639626B2 (en) | 1987-12-02 | 1987-12-02 | Sintered ore manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0639626B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03170623A (en) * | 1989-11-29 | 1991-07-24 | Sumitomo Metal Ind Ltd | Manufacture of sintered ore |
| JPH03232932A (en) * | 1990-02-09 | 1991-10-16 | Kawasaki Steel Corp | Manufacture of quicklime by using sintering machine |
| JPH0774400B2 (en) * | 1990-07-24 | 1995-08-09 | 川崎製鉄株式会社 | Sintered ore manufacturing method |
| JP2592558B2 (en) * | 1991-12-25 | 1997-03-19 | 川崎製鉄株式会社 | Quicklime recovery equipment of sintering machine |
| JP2670217B2 (en) * | 1992-11-05 | 1997-10-29 | 川崎製鉄株式会社 | Sinter production method |
| JP5550440B2 (en) * | 2010-05-10 | 2014-07-16 | 日本碍子株式会社 | Operation method of powder firing plant |
| CN115852141B (en) * | 2022-12-14 | 2025-04-22 | 中冶长天国际工程有限责任公司 | A sintered base material and its preparation method and sintering method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5419261A (en) * | 1977-07-12 | 1979-02-13 | Kubota Ltd | Classfying conveyor |
| JPS5831041A (en) * | 1981-08-20 | 1983-02-23 | Sumitomo Metal Ind Ltd | Manufacture of sintered ore |
| JPS58133331A (en) * | 1982-02-03 | 1983-08-09 | Nippon Kokan Kk <Nkk> | Preparation of sintered ore |
| JPS62212287A (en) * | 1986-03-12 | 1987-09-18 | 株式会社日本製鋼所 | Foreign matter removing device for composting equipment |
-
1987
- 1987-12-02 JP JP62303230A patent/JPH0639626B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01147023A (en) | 1989-06-08 |
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