AU777336B2 - Method for utilizing activated carbon powder recovered from exhaust sintering gas treating apparatus - Google Patents
Method for utilizing activated carbon powder recovered from exhaust sintering gas treating apparatus Download PDFInfo
- Publication number
- AU777336B2 AU777336B2 AU24044/01A AU2404401A AU777336B2 AU 777336 B2 AU777336 B2 AU 777336B2 AU 24044/01 A AU24044/01 A AU 24044/01A AU 2404401 A AU2404401 A AU 2404401A AU 777336 B2 AU777336 B2 AU 777336B2
- Authority
- AU
- Australia
- Prior art keywords
- carbon powder
- active carbon
- sintering
- exhaust gas
- recovered
- 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.)
- Ceased
Links
- 0 *I(C1)I(CC2CCCCCC2)=CC[C@]2C1OCCC2 Chemical compound *I(C1)I(CC2CCCCCC2)=CC[C@]2C1OCCC2 0.000 description 3
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/007—Conditions of the cokes or characterised by the cokes used
-
- 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
- C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
-
- 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
Description
SPECIFICATION
METHOD FOR UTILIZING ACTIVE CARBON POWDER RECOVERED FROM SINTERING EXHAUST GAS TREATMENT FACILITY TECHNICAL FIELD The present invention relates to a method for utilizing active carbon powder recovered from a sintering exhaust gas treatment facility to attain effective use thereof by recycling the active carbon powder recovered from the sintering exhaust gas treatment facility, which has been subjected to disposal in the prior art.
BACKGROUND ART In the prior art there has been used an exhaust gas treatment apparatus for processing the exhaust gas generated from a sintering machine to a desulfurization treatment in a steel-making plant. As one of these exhaust gas treatment apparatuses, a dry type apparatus utilizing active carbon is known, for example, as shown in Japanese Patent Laid-Open Publication No.Hei 5-200272 or Japanese Patent Laid-Open Publication No.Hei 10-128067.
However, a large amount of active carbon powder is generated from the exhaust gas treatment apparatus in the process of moving and transferring the active carbon.
Further, at present, this active carbon powder has no way of being reused, and has only but to be treated as wastes.
Therefore, there has also been a demand for the development of a novel technique for recycling the active carbon powder, and attaining effective use thereof from the perspectives of resource saving and refuse reduction.
The present invention has been completed with an object being to solve the foregoing problem in the art, and to provide a method for utilizing active carbon powder recovered from a sintering exhaust gas treatment facility.
With the present invention, the active carbon powder recovered from the sintering exhaust treatment facility, which has been subjected to disposal in the art, can be recycled, and effectively utilized.
DISCLOSURE OF THE INVENTION The method, provided by the present invention, for utilizing active carbon powder recovered from a sintering exhaust gas treatment facility, in an aim to solve the foregoing problem, is characterized by the reuse of the active carbon powder recovered from the sintering exhaust gas treatment facility in a manufacturing step of pig iron.
it is noted that the specific reuse method pertains to the method wherein the active carbon powder is solidified together with collected dust, a sludge, and crushed products of ores by a binder to form a cold pellet, which is then reused as a blast furnace raw material, wherein the amount of the active carbon powder to be mixed is 15% or less on a volume percent basis.
Further, the method wherein the active carbon powder is added in pseudo-granulated dust to be reused as a sintering fuel in a sintering machine is referred to as the invention of claim 3; and the method wherein the active carbon powder is blown into a blast furnace tuyere to be reused as a blast furnace fuel and/or as a reducing agent is referred to as the invention of claim 4.
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic diagram showing a treatment apparatus of a sintering exhaust gas; FIG. 2 is a graph showing the relationship between the carbon component content of a cold pellet and the pressure -*loss; FIG. 3 is a schematic diagram showing a pellet manufacturing apparatus; and FIG. 4 is a graph showing the relationship between the active carbon powder content with respect to the relative percentage of the mixed raw material and the productivity ratio.
Explanations of Numerals 1: Active carbon adsorption tower. 2: Active carbon o*o.
3- \\melb_filea\homeS\Pcabra\Keep\speci\24044. Oldoc 23/08/04 regeneration tower. 3: Active carbon transfer conveyer.
Active carbon powder hopper.
BEST MODE FOR CARRYING OUT THE INVENTION Below, the preferred embodiments of the present invention will be described with reference to the drawings.
It is noted that the present invention is not limited to the specific examples described below.
Fig. 1 shows a basic treatment apparatus of a sintering exhaust gas. In the drawing, reference numeral 1 denotes an active carbon adsorption tower, 2 is an active carbon regeneration tower, 3 is an active carbon transfer conveyer, 4 is a sieve, 5 is an active carbon powder hopper, and 6 is a funnel. The active carbon powder recovered with the active carbon powder hopper 5 has been subjected to disposal in the prior art. In contrast, the present invention has unique features in that the recovered active carbon powder is reused in a pig iron manufacturing step so as to be recycled, and effectively utilized.
Namely, the present inventors have directed their focus on the fact that a coke breeze is employed in the pig iron manufacturing step, and continued various studies thereon based on the view that the active carbon powder having the similar properties thereto can also become available when subjected to some type of modification. As a result, they have established a method for reusing it without subjecting it to disposal.
Reuse thereof can be accomplished specifically in the following manner. Namely, the active carbon powder is solidified together with collected dust, sludges, and crushed products of ores (ores containing iron) by a binder to form a cold pellet, which can then be reused as a raw material.
The cold pellet is to be charged in a blast furnace as a blast furnace raw material. Particularly, in a carbon-containing cold pellet in which a coke breeze has been mixed, reduction proceeds evenly through its inside, and hence the reducing properties can be improved. Then, in the present invention, the active carbon powder has been utilized successfully in place of the coke breeze. However, if the amount of the carbon component to be mixed is too large, the reducing properties are improved too much (inducing melting at low temperatures), causing downgrade in gas permeability in the furnace. Further, it is necessary to consider that the active carbon powder has a larger surface area than that of the coke breeze.
The present inventors have conducted a property test at high temperatures on the amount of the active carbon powder to be mixed by means of a BIS furnace by allowing a gas of ratio in which CO N 2 30 70 to flow therethrough. Specifically, a sample was heated to determine the variations in pressure loss value according to the melting characteristics following a pattern simulating the temperature increase inside of the blast furnace. Consequently, the results are as shown in FIG. 2.
The results indicated that the amount of the active carbon powder to be mixed was 15 or less, and preferably 10 or less on a volume percent basis. Further, the cold pellet obtained contained a cement as a binder, and hence it had sufficient strength. Therefore, it was also excellent in terms of handling property.
Incidentally, to give one example of the cold pellet, the one of such a formulation that 30.0 blast furnace collected dust, 12.5 sintering collected dust, 4.3 active carbon powder, 42.9 crushed products of ores (ores containing iron), and 6.5 binder cement on a mass percent basis was manufactured, and charged into a blast furnace to be used. As a result, it has been confirmed that the operation can be maintained with stability compared to that of the conventional type of cold pellet in which a coke breeze has been mixed (the one in which a coke breeze has been mixed in place of the active carbon powder).
The cold pellet as described above is obLaiined iin the following manner. The active carbon powder drawn from the active carbon powder hopper 5 of the treatment apparatus of a sintering exhaust gas by a jet-pack car is stored in a raw material tank of a pellet manufacturing apparatus as shown in FIG. 3. It is then solidified together with collected dust, sludges, crushed products of ores (for example, fine ores) by a binder, resulting in a pellet of a prescribed composition. Further, it may also be solidified with iron sand therein by a binder, resulting in a pellet.
Then, it becomes possible to make the obtained cold pellet available for use as a blast furnace raw material in a blast furnace in the manufacturing step of pig iron.
As another specific example of reuse method of the active carbon powder, it can also be added in pseudogranulated dust to be reused as a sintering fuel in a sintering machine. Herein, the pseudo-granulated dust is the one conventionally manufactured in a manufacturing plant of the cold pellet, and it denotes the one prepared by granulating ores, dust, and the like without adding a cement therein.
The active carbon powder has a mean grain size of about 0.2 mm, and thus it is fine. Therefore, if it is simply used as a fuel for sintering, the following problems arise. For example, the porosity of a sintering raw iLaterilal packed l aye is r ucetd, so th a a r jJLL L _IL X inhibition occurs, thereby entailing deterioration in productivity. Further, the burning velocity is high, and hence the quantity of heat to be transferred to the ores is small, thereby entailing decrease in sintered ore strength.
Then, the present inventors have directed their attention to the amount of the active carbon powder to be mixed (mass ratio), and conducted a study thereon.
Specifically, an operation experiment was carried out by gradually replacing the coke breeze with the active carbon powder in an increment of 0.05 from 0.05 to 0.2 with respect to the relative percentage of the mixed raw material. As a result, as shown in FIG. 4, it has been shown that the productivity is significantly worsened when it exceeds 0.1 Therefore, the amount of the active carbon powder to be mixed is preferably 0.1 or less with respect to the relative percentage of the mixed raw material. It has been confirmed that it can be used without affecting the sintering operation under the conditions. In addition, it has been confirmed as follows.
When the active carbon powder was directly used as the sintering fuel, the amount possible to be used was merely up to 0.1 with respect to the relative percentage of a sinter-bonding raw material. In contrast, when the active carbon powder was mixed with for pseudo-granulated dust as the raw material to be granulated for use, it was usable without affecting the sintering operation in an amount up to that equivalent of 1.0 of the active carbon powder contained in pseudo-granulated dust with respect to the relative percentage of a sintering mixed raw material.
Another specific method of reuse of the active carbon powder, it can also be blown into a blast furnace tuyere to be reused as a fuel and/or as a reducing agent.
In this case, the active carbon powder is harder than pulverized coal, and hence if a pulverized coal-blowing facility is used as it is, a problem of pipe abrasion friction, or the like occurs. Therefore, in its utilization, a countermeasure against abrasion is required.
Further, the active carbon powder has a larger grain size than that of the pulverized coal after crushing, and hence the burning velocity in a blast furnace slows down.
Therefore, the blowable amount of the active carbon powder has an upper limit if no crushing is performed. Then, in the present invention, it has been confirmed that an amount blown of up to 40 Kg/Tg allows operation without causing any change in furnace conditions.
INDUSTRIAL APPLICABILITY As apparent from the foregoing description, the present invention ensures that the active carbon powder recovered from the sintering exhaust gas LreaLment faciliLy, which has been subjected to disposal in the art, can be recycled to attain effective use thereof.
Therefore, the present invention makes an exceedingly large contribution to the development of industries by offering an effective utilization method of active carbon powder recovered from a sintering exhaust gas treatment facility, thereby clearing up the foregoing problems in the prior art.
Claims (3)
1. A method for utilizing active carbon powder recovered from a sintering exhaust gas treatment facility, wherein the active carbon powder recovered from a sintering exhaust gas treatment facility is solidified together with collected dust, a sludge, and crushed products of ores by a binder to form a cold pellet, which is then reused as a blast furnace raw material, characterized by the amount of the active carbon powder mixed is 15% or less on a volume basis.
2. The method for utilizing active carbon powder recovered from a sintering exhaust gas treatment facility according to claim 1, wherein the active carbon powder is added in pseudo-granulated dust to be reused as a sintering fuel in a sintering machine. *ee
3. The method for utilizing active carbon powder 20 recovered from a sintering exhaust gas treatment facility according to claim 1, wherein the active carbon powder is blown into a blast furnace tuyere to be reused as a blast furnace fuel and/or as a reducing agent. S..1 Dated this 23rd day of August 2004 NIPPON STEEL CORPORATION By their Patent Attorneys GRIFFITH HACK Fellows Institute of Patent and Trade Mark Attorneys of Australia 11 \\melbfiles\home$\Pcabral\Keep\speci\24044.01.doc 23/08/04
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP37204099A JP2001181746A (en) | 1999-12-28 | 1999-12-28 | Method for utilizing activated carbon powder recovered from sintering exhaust gas treating equipment |
| JP11-372040 | 1999-12-28 | ||
| PCT/JP2000/009375 WO2001048250A1 (en) | 1999-12-28 | 2000-12-28 | Method for utilizing activated carbon powder recovered from exhaust sintering gas treating apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2404401A AU2404401A (en) | 2001-07-09 |
| AU777336B2 true AU777336B2 (en) | 2004-10-14 |
Family
ID=18499747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU24044/01A Ceased AU777336B2 (en) | 1999-12-28 | 2000-12-28 | Method for utilizing activated carbon powder recovered from exhaust sintering gas treating apparatus |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2001181746A (en) |
| KR (1) | KR100623345B1 (en) |
| AU (1) | AU777336B2 (en) |
| WO (1) | WO2001048250A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003024918A (en) * | 2001-07-13 | 2003-01-28 | Uni Charm Corp | Disposal of used sanitary article |
| CN101549530B (en) * | 2008-12-30 | 2011-02-16 | 重庆科技学院 | Fast-setting water-hardening sludge cold hardened pellet and preparation method thereof |
| KR101353896B1 (en) | 2012-11-21 | 2014-01-22 | (주)성일하이테크 | Manufacture method of coke dust briquetting |
| CN108315083A (en) * | 2018-02-23 | 2018-07-24 | 鞍钢股份有限公司 | A kind of mixed fuel for blast furnace injection and its blowing method |
| CN111471852B (en) * | 2020-06-16 | 2021-10-01 | 武汉钢铁有限公司 | Method for sintering waste activated carbon powder, sintering mixture and sintered ore |
| CN113174453A (en) * | 2021-04-28 | 2021-07-27 | 陕西龙门钢铁有限责任公司 | Application of activated carbon powder in sintered ore desulfurization process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4852616A (en) * | 1971-11-05 | 1973-07-24 | ||
| JPH11302749A (en) * | 1998-04-16 | 1999-11-02 | Daido Steel Co Ltd | Treatment of steelmaking dust |
-
1999
- 1999-12-28 JP JP37204099A patent/JP2001181746A/en active Pending
-
2000
- 2000-12-28 AU AU24044/01A patent/AU777336B2/en not_active Ceased
- 2000-12-28 WO PCT/JP2000/009375 patent/WO2001048250A1/en active IP Right Grant
- 2000-12-28 KR KR1020017010973A patent/KR100623345B1/en active IP Right Grant
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4852616A (en) * | 1971-11-05 | 1973-07-24 | ||
| JPH11302749A (en) * | 1998-04-16 | 1999-11-02 | Daido Steel Co Ltd | Treatment of steelmaking dust |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001181746A (en) | 2001-07-03 |
| AU2404401A (en) | 2001-07-09 |
| KR20010102419A (en) | 2001-11-15 |
| WO2001048250A1 (en) | 2001-07-05 |
| KR100623345B1 (en) | 2006-09-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |