AU683520B2 - Slag granulation method and container by air crushing - Google Patents
Slag granulation method and container by air crushing Download PDFInfo
- Publication number
- AU683520B2 AU683520B2 AU11901/95A AU1190195A AU683520B2 AU 683520 B2 AU683520 B2 AU 683520B2 AU 11901/95 A AU11901/95 A AU 11901/95A AU 1190195 A AU1190195 A AU 1190195A AU 683520 B2 AU683520 B2 AU 683520B2
- Authority
- AU
- Australia
- Prior art keywords
- slag
- granulating
- gas
- ladle
- tipping
- 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
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
- B01J2/04—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a gaseous medium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/062—Jet nozzles or pressurised fluids for cooling, fragmenting or atomising slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/066—Receptacle features where the slag is treated
- C21B2400/072—Tanks to collect the slag, e.g. water tank
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Furnace Details (AREA)
- Manufacture Of Iron (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
A method and Apparatus for gas breaking-granulating of slag Technical Field The present invention relates to a granulating method of slag and the apparatus applied for, especially, to a method and apparatus for gas breaking-granulating of steel slag.
Background of the art The methods for processing molten slag nowadays are known as: water-breaking, slowly cooling, hot-splashing and discarding slag with water-cooling. In Japanese patent No.8120.061 a technique of blowing the molten slag of converter with compressed air and water-cooling is described. According to this patent, the molten slag from converter is blown with comprised air at 0.7Mpa and water-quenched to make granulor slag. The granulating rate of slag can be up to 91% and the consuming of air is about 500 to 1000
NM
3 t-slag.
Chinese patent No.88211276.6 published an apparatus for gas breaking-granulating of steel slag. In this patent, the apparatus comprises a mid4'1! ladle, a granulator and a water pool.
The bottom of the middle ladle is sloping in relation to the slag groove where the slag flow off. Compressed air is employed as the gas source of the granulator. The nozzles of the granulator are arranged in H-shape.
However, the prior art mentioned above have following drawbacks: 1. The slag ladle has to be lifted and moved to the middle ladle and the slag must be poured directly from the moving ladle into the middle ladle. Therefore, the working condition is very bad and dangerous, besides, the productivity is not high.
2. As the nozzles are arranged in H-shape, the air consuming of the granulator is high causing the insufficient utilization of compressed air.
2- 3. The gas source of the granulator makes the residual steel within the slag severely oxidized, which leads to heavy environment pollution. Also it requires high cost for the necessary equipments, such as the air compressor and pipeline.
4. There exists a hidden safety trouble since no wall is arranged between the slag groove of the middle ladle and the water pool.
The air breaking-operation brings pollution to the environment, which comes from default of dust-cleaning system.
Disclosure of the Invention The object of the present invention is to provide a method and an apparatus for gas breaking-granulating of slag which is simple, safe and reliable, non-environment polluting, power-saving and convenient to operate at low •cost and with high productivity. The method of gas breaking-granulating, of slag according to the present invention includes the following steps: 25 1) put a slag ladle on a tipping shelf of a tipping mechanism, then start the mechanism to tip the slag ladle to pour molten slag into a middle ladle gradually, at that
S..
time the molten slag flows off a slag groove of the middle ladle to the front of a granulator; 2) when the molten slag flows off the slag groove, i high speed gas flow blows from nozzles in front of the granulator arranged in U-shape or U-shape to strike the molten slag into fine slag drops; 3) the fine slag drops are cooled and solidified in S the course of flying through the water curtain of a dust- Iv'Cm I It' IKop 3re\1 I ab I iIn C'.i v I7' 3cleaning system, and then formed in ball shape, and scattered down a water pool to be further cooled; 4) the slag granules are taken out by a grab bucket and then transferred.
The method for gas breaking-granulating of slag according to the present invention, uses compressed nitrogen or steam as the gas source of the granulator. The working pressure of the gas source is between the range of 0.2-0.6 Mpa, and the expense of gas is 30-100 Nm 3 /t.
The apparatus for gas breaking-granulating of slag according to the present invention comprises a middle ladle, a granulator, a water pool and a gas source, characterised in that said apparatus further comprises a tipping mechanism for tipping a slag ladle and pouring molten slag in it into the middle ladle; the granulator is located under a slag groove defined on the middle ladle and connected to a gas source; said granulator has its nozzles arranged in front of it in U-shape or U-shape to blow out from said nozzles high speed gas flow to strike the molten ;slag into fine slag drops, which fall down into the water pool.
Brief Description of the Drawings: The embodiment of this invention will be described hereafter in detail with reference to the following attached drawings: Figure 1 is a general disposition view of the "present invention.
Figure 2 is a top view of Figure 1 (Dust-proof hood is removed).
Figure 3 shows the tipping mechanism of slag ladle.
1 Lt 1'1 '1181 11 4- Figure 4 is a top view of Figure 3.
Figure 5 shows the structure of the slag ladle.
Figure 6 shows the nozzle arrangement with Ushape.
Figure 7 shows the nozzle arrangement with Ushape.
Detailed Description of the Invention When the operation starts, the ladle 2 full of slag is put on the tipping mechanism 1 by a crane, the hydraulic cylinder 19 is started to gradually tip the slag ladle so as to allow the molten slag to be poured into the middle ladle 3. Affected by gravity, the molten slag in the middle ladle flows off from the slag groove 28 of the middle ladle to the front of the granulator 9. At the same time the gas, blowing out from the granulator flow at high speed to strike the molten slag into fine drops. The fine slag drops are cooled and solidified in dust-proof water curtain immediately, and are changed into granules in ball shape of 2mm diameter due to surface tension and then scattered into the water pool 4. The slag granules are taken out from the pool 4 by a grab bucket 5 and are transferred.
*go• *go« *ii *o r H 1' t I A Feero ap- I, I TJ k -'IS j 1.1;b I -'IK I n7 In the method of slag-granulating according to the present invention, the granulator uses nitrogen or steam as the gas source, which are very rich in all metallurgical works. The compressed air also can be used. The nitrogen also has a function to prevent the residual metal within slag form oxidization. In one embodiment of this invention, nitrogen is used as the gas source in the granulator under working pressure of 0.2-0.6MPa. The expense of nitrogen is 30-50 Nm 3 /t and the processing capacity of this unit is 2-3.5t/min.
The apparatus for slag granulating according to one embodiment of the present inventions as shown in the attached drawings comprises a tipping mechanism 1 for tipping a slag ladle, a slag ladle 2, a middle ladle 3, a granulator 9, a water pool 4, a slag wall 7, a set of dust cleaning system 6 and a gas source 8. The tipping mechanism as show in Fig.3 comprises three main parts: a slag ladle supporting stand 10, a tipping shelf 16 and a hydraulic tipping system. A supporting ear 12 is formed on the upper end of the stand 10. A supporting shaft 13 of the tipping shelf 16 is accommodated in the supporting ear 12. An orientation support 17 is located on the tipping shelf 16 and an other supporting ear is formed on the orientation support 17. In the hydraulic system, the piston of the cylinder is hinged to the lower part of the tipping shelf, the body of the cylinder is hinged to a support 20. A shaft 21 and a positioning shaft 22 are formed on the slag ladle 2. T'he positioning shaft 22 is in cooperation with the supporting ear on the orientation support 17 installed on the tipping shelf 16. When the slag ladle is put on the tipping shelf 16, the hydraulic system is started, the piston of the cylinder 19, which is hinged to the lower part of the tipping shelf 16, is moved up so that the tipping shelf 16 turns round the supporting ear 12, whereby the slag ladle is gradually tipped and the slag is poured into the middle ladle. There is a protrusion provided at the front end of the supporting ear 12 for limiting the position of the slag ladle to prevent the slag ladle from being detached from the tipping mechanism in the course of operation.
A slag groove 28 is provided on the middle ladle.
-dL~s II L ~C- Figs. 6 and 7 show the nozzle structure of the granulator arranged in U-shape and LJshape respectively according to the present invention. The diameters of the nozzles, which are formed in the front of the granulator 9 and exactly facing the slag flow, are different.
Generally speaking, the diameters of nozzles arranged in U-shape or U-shape located on the bottom row are bigger than the ueters of the nozzles located on the two vertical rows. The diameter is 4 to 14 mm. The angle between the central line of the two vertical rows is changeable between a range of 0-120 degrees, As shown in figure 1, a dust-cleaning system 6 is arranged around the water pool 4 and is composed of the water pipe 11. Holes for jetting water are provided on the pipe 11. A wall 7 is arranged on the side of the water pool adjacent the granulator to keep off the slag. The wall 7 is a water jacket made of steel. Because the wall 7 is located between the slag groove of the middle ladle and the water pool, the wall can prevent liquid slag from entering into the water pool to cause explosion in emergency situation such as sudden electricity or gas cut off, therefore, the hidden troubles can be avoided. When operating, the water is jetting out of the water pipe to form a water curtain around the water pool.
The whole process of cooling and solidifying of the granulated fine slag drops is done behind the water curtain. Thus, dust pollution can be avoided effectively. Above the water pool a dust hood is provided for preventing water and dust fog from spreading and for protecting the environment.
In one embodiment according to the present invention, the slag ladle 2, the middle ladle 3 and the tipping mechanism 1 are placed on a common platform. The cylinder body 19 is hinged to the support 20 located in a pit. The granulator 9 is arranged under the slag groove 28 on the side of the platform, and the wall 7 for keep off the slag is -located between the slag groove of the middle ladle and the water pool.
The method and apparatus for gas breaking-granulating of slag according to the present invention provide following advantages: 1. The method of this invention is very simple to carry out and of low equipment costs.
Also, the occupied area is small. In the condition of processing equal amount of slag, the costs for equipment investment are only equal to or even less than one tenth of the costs for the same in the prior art.
2. The processing capacity is large and the granulation is complete. Using the method and the apparatus of the present invention, 2 to 3,5 ton of slag can be processed within one minute. The diameter of the granula is 0.1 to 6 mm, and most of them is less than 2mm.
of slag flowed off from the middle ladle can be granulated. Specially, the granulated slag is very easy to be powdered.
3. The water consume required in the process is very low as only the amount of water to compensate the lose caused by vaporization is needed. Since no polluted water will be drained during the processing, there will be no secondary pollution.
4. The safety and reliability of processing according to the present invention have been very much increased. Also, enough distance has been provided between the granulator and the water pool. And there is a wall for keeping off the slag arranged for dealing with emergency. Therefore, the potential dangerous of hurting people by sudden explosion is totally eliminated. The unique hydraulic tipping system makes it possible for the workers to operate in a remote place to control the processing of pouring slag. It is safe, and the working conditions and intensity are highly improved.
The expense of power and gas is very low. The optimum gas consume according to the present invention is 40 to 60 Nm 3 /ton-slag. However, in Fukuyama Works, NKK of Japan, the gas consume is 500 to 1000 Nm 3 /ton. Nitrogen or steam, which are very rich in all metallurgical works can be used as the gas source (compressed air also can be used). Using nitrogen or steam can prevent the residual metals in the slag from oxidizing, It also provides the advantage that this not only can lessen the environment pollution but also increase the metal recovery ratio so that the power is greatly saved and the comprehensive benefits of the steel works can be raised.
6. Slag granulation is convenient for making a comprehensive utilization. The granulated slag is an ideal substitute for cement clinker and a favorable product to a cement manufacturer because the size of the granula is small and the granulated slag is ovsy to be powdered. Besides, the slag can be used as a raw material for sinte -r a molten agent for blast fUrnace. The early granulated slag can be used as fertilizer for agriculture.
The equipment of the present invention are simple and the design is advanced and the benefits are obvious. The hydraulic tipping system and the slag ladle are safe and reliable and bring an improvement to the working conditions and raise the productivity. The different sized nozzles arranged in U-shape or LU-shape of the granualator make either the slag or the metal being granulated completely and dropped into the water pool. Further, the gas consume is low and the slag granulation ratio is high. The arrangement of the wall between the granulator and the water pool can thoroughly remove hidden explosion trouble happening when the water comes upon liquid slag during power failure or gas cut off. The dust cleaning system improves the working conditions and reduces the dust content in the air.
The method and apparatus according to the present invention is of low equipment cost with high productivity and low power consunming, It also provides a good comprehensive benefit, and bring a good effect to protect the environment. Therefore this invention can be widely used in the field of slag processing of converter, open hearth furnace, electric arc furnace, blast furnace and other kinds of metallurgical furnaces.
Claims (12)
1. An apparatus for gas breaking-granulating of slag according to the present invention comprises a middle ladle, a granulator, a water pool and a gas source, characterised in that said apparatus further comprises a tipping mechanism for tipping a slag ladle and pouring molten slag in it into the middle ladle; the granulator is located under a slag groove defined on the middle ladle and connected to a gas source; said granulator has its nozzles arranged in front of it in U-shape or J-shape to blow out from said nozzles high speed gas flow to strike the molten slag into fine slag drops, which fall down into the water pool.
2. An apparatus for gas breaking-granulating of slag as claimed in claim 1, characterised in that said tipping mechanism for tipping the slag ladle also comprises a supporting equipment and a set of positioning units for preventing the slag ladle from falling over and falling off.
3. An apparatus for gcas breaking-granulating of slag as claimed in claim 1 or 2, characterised in that said 25 tipping mechanism further comprises a stand and a supporting ear located in the upper part of said stand; a tipping shelf has its supporting shaft accommodated in the supporting ear, an orientation support is defined on the tipping shelf, a piston of a hydraulic cylinder is hinged to the lower part of the tipping shelf and the body of the cylinder is hinged to a support.
4. An apparatus for gas breaking-granulating of slag as claimed in claim 1, characterised in that the diameter of the nozzles in the bottom row of said granulator is bigger than the diameter of the nozzles in the two vertical rows and the angle between the central lines of the nozzles It "hi t I o" it t N' 1 1, Z "j v&Z o I K k 11 1 i I '14 '1 10 of the two vertical rows is changeable in a range of 0 to 120 degrees.
An apparatus for gas breaking-granulating of slag as claimed in claim 1, cha.acterised in that the gas source is compressed nitrogen.
6. An apparatus for gas breaking-granulating of slag as claimed in claim 1, characterised in that the gas source is compressed steam.
7. An apparatus for gas breaking-granulating of slag as claimed in claim 1, characterised in that said apparatus also comprises a water curtain dust-cleaning system.
8. An apparatus for gas breaking-granulating of slag as claimed in claim 1, characterised in that a slag wall is arranged between said granulator and the water pool.
9. A method for gas breaking-granulating of slag including the following steps: 1) put a slag ladle on a tipping shelf of a tipping mechanism, then start the mechanism to tip the slag ladle 25 to pour molten slag into a middle ladle gradually, at that tJme the molten slag flows off a slag groove of the middle ladle to the front of a granulator; 2) when the molten slag flows off the slag groove, 30 high speed gas flow blows from nozzles in front of the granulator, the nozzles being arranged in U-shape or shape, to strike the molten slag into fine slag drops; e 3) the fine slag drops are cooled and solidified in the course of flying through the water curtain of a dust- cleaning system, and then formed in ball shape, and a scattered down a water pool to be further cooled; 'IMEL.( I\ \him o ht I K lK v'l :re -o I I) tl I J I A -I I .A li i I I i! 11 4) the slag granules are taken out by a grab bucket and then transferred.
10. A method for gas breaking-granulating of slag as claimed in claim 9, characterised in that a gas source is compressed nitrogen or steam, and the expense of gas is Nm 3 slag.
11. An apparatus for gas breaking-granulating of slag substantially as described herein with reference to and as illustrated by the accompanying drawings.
12. A method for gas breaking-granulating of slag substantially as described herein with reference to and as illustrated by the accompanying drawings. D'ted this 25th day of August 1997 CHENGDU IRON STEEL WORKS By their Patent Attorneys GRIFFITH HACK Fellows Institute of Patent Attorneys of Austtalia e e \Z1?\MEol hcn'Shr2 t LQ\~\KQ0P\L'X 9019 bvOu1. 25i08l97
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93115409 | 1993-12-11 | ||
| CN93115409A CN1103667A (en) | 1993-12-11 | 1993-12-11 | Air breaking and pelletizing technology and apparatus for slag |
| PCT/CN1994/000098 WO1995015929A1 (en) | 1993-12-11 | 1994-12-09 | Slag granulation method and container by air crushing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU1190195A AU1190195A (en) | 1995-06-27 |
| AU683520B2 true AU683520B2 (en) | 1997-11-13 |
Family
ID=4991034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU11901/95A Ceased AU683520B2 (en) | 1993-12-11 | 1994-12-09 | Slag granulation method and container by air crushing |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN1103667A (en) |
| AU (1) | AU683520B2 (en) |
| WO (1) | WO1995015929A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101691620B (en) * | 2009-09-10 | 2011-06-08 | 河北理工大学 | Process and device for processing liquid steel slag |
| CN101660012B (en) * | 2009-09-25 | 2012-07-18 | 阳谷祥光铜业有限公司 | Anhydrous granulating technique of metallurgical slag and device thereof |
| CN101886148A (en) * | 2010-07-08 | 2010-11-17 | 无锡市东方环境工程设计研究所有限公司 | Method for recovering high-temperature molten slag |
| CN101886149A (en) * | 2010-07-08 | 2010-11-17 | 无锡市东方环境工程设计研究所有限公司 | High temperature liquid slag recovery method |
| CN102329902B (en) * | 2011-10-15 | 2016-09-07 | 杜天宇 | A kind of device structure of metallurgical gas-water continuous quenching |
| CN103710479B (en) * | 2014-01-17 | 2016-05-18 | 中冶华天工程技术有限公司 | Steel slag water quenching treatment system |
| CN115418420B (en) * | 2022-09-26 | 2023-07-25 | 马鞍山钢铁股份有限公司 | Treatment device and treatment method for improving wind-break slagging of steel slag |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5919532A (en) * | 1982-07-26 | 1984-02-01 | Nippon Steel Corp | Apparatus for collecting semi-solidified particles |
| JPS5943807A (en) * | 1982-09-03 | 1984-03-12 | Nippon Kokan Kk <Nkk> | Method for supplying molten slag at constant rate to tundish |
| CN88211276U (en) * | 1988-05-06 | 1988-12-21 | 马鞍山钢铁公司 | Wind power granulating device for steel dross |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4279814A (en) * | 1979-06-27 | 1981-07-21 | Crompton & Knowles Corporation | Salicyl phenyl naphthyl trisazo di and trisulfonic developed direct black dyes |
-
1993
- 1993-12-11 CN CN93115409A patent/CN1103667A/en active Pending
-
1994
- 1994-12-09 AU AU11901/95A patent/AU683520B2/en not_active Ceased
- 1994-12-09 WO PCT/CN1994/000098 patent/WO1995015929A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5919532A (en) * | 1982-07-26 | 1984-02-01 | Nippon Steel Corp | Apparatus for collecting semi-solidified particles |
| JPS5943807A (en) * | 1982-09-03 | 1984-03-12 | Nippon Kokan Kk <Nkk> | Method for supplying molten slag at constant rate to tundish |
| CN88211276U (en) * | 1988-05-06 | 1988-12-21 | 马鞍山钢铁公司 | Wind power granulating device for steel dross |
Also Published As
| Publication number | Publication date |
|---|---|
| AU1190195A (en) | 1995-06-27 |
| CN1103667A (en) | 1995-06-14 |
| WO1995015929A1 (en) | 1995-06-15 |
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| Date | Code | Title | Description |
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| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |