WO2009122922A1 - セメントボンド塊成鉱の製造方法 - Google Patents
セメントボンド塊成鉱の製造方法 Download PDFInfo
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- WO2009122922A1 WO2009122922A1 PCT/JP2009/055399 JP2009055399W WO2009122922A1 WO 2009122922 A1 WO2009122922 A1 WO 2009122922A1 JP 2009055399 W JP2009055399 W JP 2009055399W WO 2009122922 A1 WO2009122922 A1 WO 2009122922A1
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- pellets
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/214—Sintering; Agglomerating in shaft furnaces
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- the present invention relates to a method for producing a cement bond agglomerate.
- FIG. 5 is a diagram showing a process for producing cold pellets for a blast furnace by conventional yard curing.
- Portland cement is added as a binder using raw materials made of ironworks dust and / or fine ore, mixed in a kneader, granulated with a pan pelletizer, and passed through a screen.
- the curing mountain is crushed using an excavator, loaded again in the secondary curing yard, and then cured for another week to achieve the predetermined strength. It will be paid out when it comes out and used in a blast furnace.
- the composition of the particle size of the metal-containing carbon-containing dust generated from the steel mill is set to the ratio of the coarse fraction to the fine fraction.
- a method for producing dust cold pellets is proposed, in which ore powder is blended as necessary so that it falls within the appropriate particle size distribution range and granulated by adding a binder such as cement to an appropriate moisture content. ing.
- powdered iron-containing raw material is mixed with granulated blast furnace pulverized powder and gypsum, granulated or agglomerated, and not fired.
- blast furnace granulation and gypsum are pulverized to a specific surface area of 4000 cm 2 / g or more and then blended at a rate of 6 to 9% with respect to the iron-containing raw material at a temperature of 40 ° C or higher.
- a method for producing a non-fired agglomerated mineral is proposed in which an agent is added, kneaded with water and agglomerated, and then cured while being kept warmed after being loaded in a curing yard.
- FIG. 6 is a diagram showing a manufacturing process of a conventional mini pellet for sintering.
- bentonite is used as a binder for raw materials made of ironworks-generated dusts and / or fine ore, mixed in a kneader, and then granulated into small-diameter pellets with a diameter of 2 to 7 mm with a pan pelletizer.
- a mini-pellet method in which the powder is passed through a screen and directly supplied to a sintering machine without being cured has been industrially applied.
- Patent Document 3 Japanese Patent Application Laid-Open No. 59-107036
- granulation is performed by adding moisture to non-carbon-containing dust collection dust generated in each step of the steelmaking process.
- non-sintered mini-pellets for sintered raw materials with blast furnace gas ash deposited on the surface have been proposed.
- the blast furnace cold pellet method described above requires a curing yard and requires a large facility space.
- the secondary curing yard uses a part of the ore yard, so the secondary curing yard will reduce the ore yard capacity, and the iron ore yard capacity is not enough. There is. Further, in the yard curing, a crushing operation is required after the primary curing, and dust generation at that time becomes an environmental problem. In addition, the crushing work takes manpower, and the product yield decreases due to crushing.
- the water spray adheres to the cold pellets when the blast furnace is charged.
- the total moisture content is 7-8% when combined with the crystallization water associated with the hydration reaction. Exceeds 10%. For this reason, there is a problem in that the amount of use in the blast furnace is limited because an adverse effect of lowering the top temperature of the blast furnace appears when the amount used is increased.
- the moisture content of the mini pellets is as high as 12 to 15%, which makes it easy to cause shelves and shelves on the inner wall of the sintered storage tank.
- the amount of mini pellets cut out from the storage tank varies.
- the mini-pellet method is introduced, but the mini-pellet is abandoned, and the moisture is lowered to 10% or less and supplied to the sintering as mere kneaded dust to prevent presence.
- the actual condition is that the sintering productivity is reduced due to the deterioration of the air permeability of the sintered bed accompanying the addition of fine dusts.
- the gist of the invention is that Portland cement is added as a binder to ironworks-generated dust and / or fine ore, and after mixing, humidity conditioning and kneading processes, granulation is performed with a pan pelletizer, and then curing is performed to obtain the required crushing strength.
- a moving bed is formed by inserting raw pellets from the top of a vertical container that has the following three conditions and discharging from the bottom.
- the present invention resides in a method for producing a cement bond agglomerate characterized in that it is cured by heat of hydration reaction of cement during a period from charging to discharging of raw pellets.
- 1) Have a taper of 1/10 to 1/30 spreading downward on the whole or upper part of the vertical container body 2)
- a feeder can be placed to ensure that the charge descends due to the piston flow.
- the cured pellets discharged from the bottom of the vertical container are immediately removed by a bucket elevator. Having a supply device that can prevent the charging surface of the vertical container from being lowered by lifting up to the top of the mold container and supplying it instead of raw pellets.
- a curing yard that requires a large installation space can be omitted, so that the manufacturing facility can be made compact and the facility installation location can be freely selected.
- the degree is increased and the crushing work after the primary curing is not required, so that environmental improvement, labor saving, and yield improvement are possible.
- the cold pellets are dried, a decrease in the top temperature when using the blast furnace can be avoided, so that the amount used in the blast furnace can be increased.
- mini-pellet method it is easy to conceive of producing mini-pellets using Portland cement as a binder.
- conventional yard curing method there is a problem of the curing yard installation space, crushing after curing. Because there are environmental problems due to dust generation, manpower problems for crushing, and problems of yield reduction due to crushing, there are no industrially implemented examples.
- the mini-pellet method which is a simple dust treatment method, can be industrially implemented, and it is possible to avoid a decrease in the productivity of sintering due to the direct addition of dusts. It is effective.
- FIG. 1 is a diagram showing a manufacturing process of a cold pellet for a blast furnace according to the present invention.
- a manufacturing method that does not require yard curing is provided. It is to provide.
- the details of the vertical container will be described later.
- the type of the dryer is not limited as long as it is a continuous type. A band dryer or a vertical moving bed dryer can be used.
- FIG. 2 is a diagram showing a production process of a mini-pellet for sintering according to the present invention.
- a Portland-based cement is used as a binder, and after curing to a predetermined strength in a vertical container, a manufacturing method that does not require yard curing is provided by replenishing the sintered storage tank.
- FIG. 3 is an overall schematic view showing functions that the vertical container according to the present invention should have.
- the raw pellets 2 are charged from the upper part of the vertical container 1 and are charged continuously from the table feeder 4 installed at the lower part of the vertical container 1 as the cured agglomerate 7.
- the moving layer 3 that descends is formed.
- the curing of the raw pellets 2 proceeds by the hydration reaction of the Portland cement, and when the curing progresses to a predetermined strength, the rotation of the driving device 5 causes the table feeder 4 to rotate. Cut out by the cutout opening 6.
- the cut agglomerated ore 7 cut out is transported to the next step 9 via the switching device 8 in a steady state, but in a non-steady state such as a pause of the raw pellet manufacturing process, the switching device 8 is switched, The bucket elevator 10 is charged again from the top of the vertical container 1.
- the shape of the bowl-shaped container 1 is basically spread downward.
- the moisture after granulation of cold pellets for blast furnace and mini pellets for sintering is about 10 to 13% and 12 to 15%, respectively. For this reason, it is possible to prevent dwelling and shelf hanging by spreading downward.
- a lateral movement is added, so the effect of suppressing the mutual adhesion of cement bond agglomerates described later is increased.
- the optimum angle is 1/10 to 1/30.
- the cured agglomerate cut out from the vertical container is immediately supplied from the upper part of the vertical container, It is necessary to keep the surface of the charge in a steady position.
- the agglomerated ore that has been cured does not have to be cut out from the vertical container, and for example, agglomerated ore that has been stored in a separate storage tank may be supplied.
- the supply of cured agglomerates is stopped and the supply of raw pellets is resumed.
- the shape of the bowl-shaped container 1 is not limited to simply spreading downward, and various shapes can be adopted as shown in FIGS. 4 (a) and 4 (b). If cement bond agglomerates immediately after granulation are likely to stick to each other, increasing the descending speed and increasing the lateral movement by increasing the taper at the top of the vertical container will help prevent sticking. Is. In such a case, the shape shown in FIG. The gradient is 1/10 for the upper quarter of the vertical container and 1/20 for the lower 3/4. Conversely, if the agglomerates are difficult to stick to each other, the lower part of the fuselage can be made straight without a taper as shown in FIG. The upper slope of the fuselage at that time is 1/10 to 1/30.
- Table 1 cold pellets for a blast furnace were manufactured using a vertical container.
- Table 2 shows the composition of dusts and fine ore used as raw materials for cold pellets for blast furnaces.
- the powder ore used was sintered and previously pulverized with a ball mill so that -44 ⁇ m was about 60%.
- Table 1 shows the results of two operations each of three levels in which the target strength of the product pellets was set to 100, 120, and 160 kg / cm 2 .
- the blending ratio was set according to the type of blended raw material and the target strength.
- the operation was carried out in a vertical container with a taper (gradient) of 1/20, an average descent rate of 1.39 cm / min, a residence time of 24 hours, and the crushing strength (drying) when cut out from the vertical container after 24 hours.
- a taper grade
- Pre-strength and display Pre-strength and display), and it was dried at 200 ° C. for 30 minutes using a band dryer, dried to less than 1% moisture, and then cooled, and then the crushing strength (displayed after drying) was displayed.
- the ratio between the strength before drying and the strength after drying is the front / back ratio (%). Looking at the results of operation, the strength after drying was almost the same as the target strength, and cold pellets that could withstand use in a blast furnace could be manufactured.
- the crushing strength of the cured pellets is about 60% to 80% of the target strength of the product pellets. It was found that if the internal residence time is set, the crushing strength of the product pellets after drying is almost the target strength. When it is desired to shorten the residence time, it is possible to adjust by using an ultra-early strong cement or a hydration reaction accelerator.
- the reason why the strength increases from 60% to 80% to 100% by drying the cured pellet can be considered as follows.
- water existing between the dust particles evaporates and aggregates. This is due to the capillary tension calculated by the surface tension of the water and the radius of curvature of the water existing between the particles, and the intermolecular attractive force (van der Waals force) also works.
- van der Waals force van der Waals force
- the curing time is 24 hours from the viewpoint of downsizing the vertical container. Also, in the existing yard curing, it is possible to omit the secondary curing yard by drying the completed pellets in the primary curing yard.
- Table 3 shows examples in which mini-pellets for sintering were manufactured using a vertical container and used up to 5% in the raw material of the sintering machine.
- Table 4 shows the composition of dusts used as raw materials for mini-pellets. This operation is performed at two levels with different blending ratios of early-strength cement.
- the taper (gradient) of the vertical container is 1/10 for the upper 1/4 of the vertical container body and 1/20 for the lower 3/4.
- the descending speed was 1.39 cm / min, the residence time was 24 hours, and the crushing strength when cut out from the vertical container after 24 hours and the raw pellet strength immediately after granulation were displayed.
- Table 3 shows the curing that is discharged from the vertical container when the height of the vertical container is H (m) and the bulk density of the raw pellets charged in the vertical container is ⁇ B (t / m 3 ).
- the reference strength to be achieved by the crushing strength of the finished pellets was expressed as 1/5 ⁇ H ⁇ B (kg / cm 2 ).
- the static pressure due to the upper mini-pellet applied to the lowest mini-pellet of the bowl-shaped container is 1/10 ⁇ H ⁇ B because the wall effect disappears from the shape of the lower spread, but the crushing strength of the mini-pellet particles is considerable.
- the double is used as a reference value. Both levels of operational performance were able to achieve this standard value.
- a curing yard that requires a large installation space can be omitted, so that the manufacturing facility can be made compact and the facility installation location can be freely selected.
- the degree is increased and the crushing work after the primary curing is not required, so that environmental improvement, labor saving, and yield improvement are possible.
- the cold pellets are dried, a decrease in the top temperature when using the blast furnace can be avoided, so that the amount used in the blast furnace can be increased.
- the mini-pellet method which is a simple dust treatment method, can be industrially implemented, and it is possible to avoid a decrease in the productivity of sintering due to the direct addition of dusts.
- This method is suitable for use in a similar method.
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Abstract
Description
で、その際の発塵が環境上の問題となる。また、解砕作業に人手が掛かり、解砕により成品歩留りが低下する。
製鉄所発生ダスト類、および/または微粉鉱石にバインダーとしてポルトランド系セメントを加え、混合、調湿、混練工程を経た後、パンペレタイザーで造粒し、しかる後に養生することで所要の圧潰強度を持った高炉向けコールドペレット、または焼結向けミニペレットを製造する方法において、以下の三つの条件を併せ持つ竪型容器の上部から生ペレットを装入し下端から排出することで移動層を形成せしめ、生ペレットの装入から排出までの期間にセメントの水和反応熱により養生することを特徴とする、セメントボンド塊成鉱の製造方法にある。
1)下広がりの1/10~1/30のテーパを竪型容器胴体の全体または上部に有すること
2)竪型容器下端に、該竪型容器下部の断面積全体をカバーできる大きさのテーブルフィーダーを配置し、装入物がピストンフローで降下することを保証できること
3)生ペレットの装入が停止した際に、竪型容器下部から排出される養生済みのペレットを、バケットエレベーターにより直ちに竪型容器上部まで持ち上げ、かつ生ペレットの代りに供給することで、竪型容器の装入面の低下を防止できる供給装置を有すること。
法では養生ヤード設置スペースの問題、養生後解砕時の発塵による環境問題、解砕のための人手の問題、解砕に伴う歩留り低下の問題があることから、工業的に実施された例が無かったものを、本発明により、上記問題が解消されることに加えて、焼結貯鉱槽でのミニペレットの崩壊・粉化を起こさないだけの十分な強度を持たせることが可能であり、また強度が出てから補給することから焼結貯鉱槽内壁への居付き・棚吊りも回避できる。
2 生ペレット
3 移動層
4 テーブルフィーダー
5 フィーダー駆動装置
6 切出口
7 養生済み塊成鉱
8 切替え装置
9 次工程
10 バケットエレベーター
図1は、本発明に係る高炉向けコールドペレットの製造工程を示す図である。この図1に示すように、図5に示した従来法の1次養生ヤードと2次養生ヤードを、本発明では竪型容器と乾燥機に置き換えることで、ヤード養生を必要としない製造方法を提供するものである。なお、竪型容器の詳細は後述する。乾燥機は、連続式であれば形式は問わない。バンドドライヤ、竪型移動層式乾燥機などの採用が可能である。
、焼結貯鉱槽に補給することで、ヤード養生を必要としない製造方法を提供するものである。図3は、本発明に係る竪型容器が具備すべき機能を示す全体概略図である。竪型容器1の上部から生ペレット2が装入され、竪型容器1内の下部に設置されたテーブルフィーダー4より養生済み塊成鉱7として切り出されるまでの間に、装入物は絶え間なく降下する移動層3を形成する。
表1に示すように、竪型容器を用いて高炉向けコールドペレットを製造した。また、表2に、高炉向けコールドペレットの原料として使用したダスト類および粉鉱石の配合を示す。粉鉱石は焼結用のものを-44μmが60%程度となるように事前にボールミルで粉砕したものを使用した。表1には、成品ペレットの目標強度を100、120、160kg/cm2 に設定した3水準の操業を各2回実施した結果を示している。
ρB (t/m3 )の時、竪型容器から排出される養生済みペレットの圧潰強度が達成すべき基準強度を1/5・HρB (kg/cm2 )として表示した。
Claims (1)
- 製鉄所発生ダスト類、および/または微粉鉱石にバインダーとしてポルトランド系セメントを加え、混合、調湿、混練工程を経た後、パンペレタイザーで造粒し、しかる後に養生することで所要の圧潰強度を持った高炉向けコールドペレット、または焼結向けミニペレットを製造する方法において、以下の三つの条件を併せ持つ竪型容器の上部から生ペレットを装入し下端から排出することで移動層を形成せしめ、生ペレットの装入から排出までの期間にセメントの水和反応熱により養生することを特徴とする、セメントボンド塊成鉱の製造方法。
1)下広がりの1/10~1/30のテーパを竪型容器胴体の全体または上部に有すること
2)竪型容器下端に、該竪型容器下部の断面積全体をカバーできる大きさのテーブルフィーダーを配置し、装入物がピストンフローで降下することを保証できること
3)生ペレットの装入が停止した際に、竪型容器下部から排出される養生済みのペレットを、バケットエレベーターにより直ちに竪型容器上部まで持ち上げ、かつ生ペレットの代りに供給することで、竪型容器の装入面の低下を防止できる供給装置を有すること。
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
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CN2009801200394A CN102046819B (zh) | 2008-03-31 | 2009-03-19 | 水泥粘结团块矿的制造方法 |
CA2719899A CA2719899C (en) | 2008-03-31 | 2009-03-19 | Method of production of cement bonded agglomerated ore |
US12/736,362 US8435439B2 (en) | 2008-03-31 | 2009-03-19 | Method of production of cement bonded agglomerated ore |
BRPI0910107-1A BRPI0910107B1 (pt) | 2008-03-31 | 2009-03-19 | Método de produção de minério aglomerado ligado com cimento |
KR1020107023849A KR101187063B1 (ko) | 2008-03-31 | 2009-03-19 | 시멘트 본드 괴성광의 제조 방법 |
AU2009233017A AU2009233017B2 (en) | 2008-03-31 | 2009-03-19 | Process for producing cement-bonded ore agglomerates |
EP09728133.1A EP2264195A4 (en) | 2008-03-31 | 2009-03-19 | METHOD FOR MANUFACTURING AGGLOMERATES OF ORE BORED WITH CEMENT |
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JP2008089507A JP4327222B1 (ja) | 2008-03-31 | 2008-03-31 | セメントボンド塊成鉱の製造方法 |
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JP6525806B2 (ja) * | 2015-08-10 | 2019-06-05 | 日本製鉄株式会社 | 製鉄ダストの事前処理方法 |
CN113136487B (zh) * | 2021-04-07 | 2021-12-31 | 内蒙古金辉稀矿股份有限公司 | 一种基于球团矿生产的膨润土添加剂制备工艺 |
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US6565623B2 (en) * | 2001-03-20 | 2003-05-20 | Startec Iron Llc | Method and apparatus for curing self-reducing agglomerates |
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- 2009-03-19 US US12/736,362 patent/US8435439B2/en not_active Expired - Fee Related
- 2009-03-19 CN CN2009801200394A patent/CN102046819B/zh active Active
- 2009-03-19 CA CA2719899A patent/CA2719899C/en not_active Expired - Fee Related
- 2009-03-19 AU AU2009233017A patent/AU2009233017B2/en not_active Ceased
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JPS53130202A (en) | 1977-04-20 | 1978-11-14 | Nippon Steel Corp | Preparation of cold pellet of dust |
JPS56105432A (en) * | 1980-01-28 | 1981-08-21 | Sumitomo Metal Ind Ltd | Method and apparatus for producing cold-briquetted ore |
JPS58133335A (ja) * | 1982-02-02 | 1983-08-09 | Nippon Kokan Kk <Nkk> | 非焼成塊成鉱の製造方法および装置 |
JPS59107036A (ja) | 1982-12-10 | 1984-06-21 | Nippon Steel Corp | 焼結原料用非焼成ミニペレツト |
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Title |
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TSUNEO MIYASHITA ET AL.: "Cold Pellet no Renzoku Kyusoku Yojo Process no Kaihatsu Oyobi Seihin no Seijo Hyoka", JOURNAL OF THE IRON & STEEL INSTITUTE OF JAPAN, vol. 69, no. 16, December 1983 (1983-12-01), pages 1974 - 1981, XP008141930 * |
Also Published As
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KR101187063B1 (ko) | 2012-09-28 |
KR20100124846A (ko) | 2010-11-29 |
JP4327222B1 (ja) | 2009-09-09 |
BRPI0910107A8 (pt) | 2017-10-17 |
EP2264195A4 (en) | 2016-03-02 |
CN102046819A (zh) | 2011-05-04 |
AU2009233017B2 (en) | 2011-10-20 |
JP2009242848A (ja) | 2009-10-22 |
US8435439B2 (en) | 2013-05-07 |
CA2719899A1 (en) | 2009-10-08 |
BRPI0910107A2 (pt) | 2016-06-21 |
CA2719899C (en) | 2013-11-26 |
CN102046819B (zh) | 2013-04-10 |
AU2009233017A1 (en) | 2009-10-08 |
US20110037206A1 (en) | 2011-02-17 |
EP2264195A1 (en) | 2010-12-22 |
BRPI0910107B1 (pt) | 2018-05-22 |
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