WO2015068172A1 - Method and apparatus for handling steel making slag and metal recovery - Google Patents
Method and apparatus for handling steel making slag and metal recovery Download PDFInfo
- Publication number
- WO2015068172A1 WO2015068172A1 PCT/IN2014/000314 IN2014000314W WO2015068172A1 WO 2015068172 A1 WO2015068172 A1 WO 2015068172A1 IN 2014000314 W IN2014000314 W IN 2014000314W WO 2015068172 A1 WO2015068172 A1 WO 2015068172A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- slag
- thimble
- metal
- mold
- disposal
- Prior art date
Links
- 239000002893 slag Substances 0.000 title claims abstract description 373
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 151
- 239000002184 metal Substances 0.000 title claims abstract description 151
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000011084 recovery Methods 0.000 title claims abstract description 29
- 238000009628 steelmaking Methods 0.000 title claims description 16
- 238000000926 separation method Methods 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 13
- 238000000638 solvent extraction Methods 0.000 claims description 6
- 229910001208 Crucible steel Inorganic materials 0.000 claims description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 239000011572 manganese Substances 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 2
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- -1 land Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 239000006148 magnetic separator Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/04—Working-up slag
-
- 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
-
- 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
- C21B3/10—Slag pots; Slag cars
-
- 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
- TITLE METHOD AND APPARATUS FOR HANDLING STEEL MAKING SLAG AND METAL RECOVERY
- MRP metal recovery plant
- an apparatus for handling metal containing slag inclusive of slag with tiny droplets of metal and metal recovery comprising a slag thimble having a base with surrounding side walls and an open top for metal containing slag and allowing settling of heavier metal contents below the top slag in thimble, handling slag in small batches and graduation/indication marks indicative of angle of tilt of the slag thimble enabling stepwise controlled pouring, said graduation/indication marks based tilting of said slag thimble for slag disposal based on level of heavier metal contents below the top slag whereby the slag thimble can be selectively initially angularly tilted for initial separation of the said top slag substantially free of metal contents for separate dumping followed by subsequently further angular tilt for separating the said heavier metal content remaining below said top slag for metal recovery.
- the slag thimble of the present apparatus comprises trunnion mounted on said slag thimble which comprises the graduation/indication marks indicative of the angle of tilt of the slag thimble for facilitating the controlled slag disposal and metal recovery based on the slag volume in said slag thimble.
- the said slag thimble may comprise a cooling arrangement detachably secured with outside of the slag thimble adapted to externally shell refrigeration of the slag thimble for maintaining temperature of the slag thimble near to room temperature for providing a lower temperature gradient of the shell of the slag thimble with respect to the slag entering into the slag thimble.
- the mold means comprises separate cavities with partitioning walls providing for said small blocks of slag and each of said small blocks of slag in the form of mold cavities of volume 1 to 4 cubic meter.
- Stepwise controlling the tilting of the slag thimble for effective slag disposal whereby slag substantially free of metal contents separated by dumping in mold and subsequently the slag with the metal content recovered separately.
- This cooling arrangement externally refrigerate shell of the slag thimble for maintaining temperature of the slag thimble near to room temperature and providing a lower temperature gradient of the shell of the slag thimble with respect to the slag entering into the slag thimble.
- the tilting angle of the slag thimble is controlled for favoring the metal recovery from the slag.
- the trunions associated with the slag thimble of the present invention comprises reference indicator such as angle graduation/indication marks (as shown in the accompanying figure 2 and 2(a)), which are indicative of the angle of tilt of the slag thimble based on the level of entrapped metal contents beiow the top slag.
- reference indicator such as angle graduation/indication marks (as shown in the accompanying figure 2 and 2(a)), which are indicative of the angle of tilt of the slag thimble based on the level of entrapped metal contents beiow the top slag.
- top slag The remaining below the top slag is basically slag with tiny droplets of metal in slag thimble. This remaining is allowed to settle down and cool in the thimble itself, cooled either with the help of man cooler/atmospheric air from the external of slag thimble and then the slag thimble is tilted upon beyond 70 degrees and up to 126 degrees (as shown in the accompanying figure 4) for disposal of the remaining slag with the entrapped tiny droplets of metals. The top slag layer is then chipped off for recovering the metal which can be used as scrap (coolant) without any further processing.
- the cavities of the mold means are selected of desired shape and configuration preferably selected from square cavity, conical cavity, rectangular cavity and elliptical cavity.
- This slag with the metal content nearer to the surface of the slag thimble is cooled by using the lower temperature gradient of the shell of the slag thimble.
- the initial tilting is carried out based on angle graduations for disposal of slag which are not adhered to the shell of the slag thimble and substantially free of metal and thereby separating from the slag with the metal content adhered to the shell of the slag thimble.
- the gradual tilting the gradual variation of the angle of tilt of said slag thimble and disposed or dumped amount of the liquid media is continuously measured.
- the functional dependence between the disposed or dumped amount of the liquid media and the angle of tilt of the slag thimble form the continuously measured angle of tilt and the dumped amount of the liquid media is determined.
- the initial reference angle of tilt for the slag thimble is then determined based on said functional dependence which indicates the angle of tilt of the slag thimble for disposal of requisite amount of the liquid media stored in the slag thimble.
- the graduation/titling indication of said slag thimble is used for carrying out said slag and metal separation preferably with carrying out tilting based on said angle graduations of up to 70 degrees for safe slag disposal of up to 75 % of the dumped slag which are substantially free of metal and subsequently cooling the remaining slag in the thimble and thereby separately carrying out tilting at subsequent angle graduations beyond 70 degrees and upto 126 degrees of thimble which dispose the slag having metal contents.
- the metals are recovered by chipping the top slag form the disposed slag.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
An apparatus and a process to favour slag management and metal recovery process in a metal processing industry involving a slag thimble having a base with surrounding side walls and an open top for containing metal containing slag and allowing settling of entrapped metal contents below the top slag in small batches and graduation/indication marks indicative of angle of tilt of the slag thimble enabling stepwise controlled said graduation/indication marks based tilting of said slag thimble for slag disposal based on level of entrapped metal contents below the top slag whereby the slag thimble can be selectively initially angularly tilted for initial separation of the said top slag substantially free of metal contents for separate dumping followed by subsequently further angular tilt for separating the said entrapped metal content remaining below said top slag for metal recovery; and mold means providing for disposal of slag in small blocks.
Description
TITLE: METHOD AND APPARATUS FOR HANDLING STEEL MAKING SLAG AND METAL RECOVERY
FIELD OF THE INVENTION:
The preset invention relates to an apparatus and a method for operation in metal manufacturing process to make the slag handling easier and to recover metallic loss that is going out through the molten slag obtained from the metal making furnace and to overcome the disadvantages that is being faced in conventional slag handling process. The present invention is advantageously avoids any complex chemical, mechanical process for recovering metal from the slag and particularly useful of steel processing industry.
BACKGROUND OF THE INVENTION:
In a steel making process there are various byproducts which were formed during the various reactions that are being carried out in the steel making operation. During this process slag is produced which is one of the major byproduct which is formed due to the impurities present in the hot metal that is obtained from the iron making. It is well known that the hot metal is charged with few percent of scrap as a coolant. The process start by blowing /arcing and the slag formation takes place, after many chemical reactions the steel is made either with the help of L D convertor or Arc furnace by complete removal of impurities in a form of slag to make steel. After the steel is produced with slag floating over the steel due to the density difference the tapping of steel is done from the furnace through a hole called tap hole. After the completion of tapping (means metal is collected in a steel ladle), then the leftover product is slag in the furnace. Then the leftover slag is completely dumped in the slag thimble provided. There will be metallic remains/particles that also flow with slag into slag thimble due to the slag metal mixer. This loss of metallic content directly affects the yield of the steel making because it is a processed steel and to recover the metal from that slag adds up to the cost of the steel making and also making the slag handling difficult due to slag and metal fusion which is very hard to break or disintegrate and the metal content in the slag means loss in money and this makes the process complicated and create very unsafe working condition.
In a conventional process of slag handling, slag from the steel furnace is bought to the yard and dumped in allocated area called PIT. After dumping of few numbers (prescribed quantity) of slag thimbles of some prescribed quantity as per the capacity of the slag pit that is how much it can hold, up to that much amount of slag is dumped then that slag is
cooled with the help of water. ( we all know that slag is a brittle and hard mass, bad conductor of heat so it is very difficult to process it further and if metal is present in it, it makes the processing even harder and lengthy) then the slag is loosened after the cooling with the help of heavy earth movers but with many difficulties. This adds up the cost of processing of slag and steel making because even disposal of gangue material is very important, and even if the metal present comes in contact with the cooling water there are possibilities to oxidation of the metal which is uneconomical to reuse.
In the conventional process there are many deficiencies which not only make the process difficult but also adds up the cost of steel making and make the process too much unsafe and difficult. There are many deficiencies some of them are listed below:
Due to the slag dumped and cooled in a very vast area. The molten slag which is comes in contact with entrapped metal bonds up and forms a hard cake of mass/bolder. This is very hard to loosen/break in to small pieces because of the hardness before its disposal it must be broken in small pieces for disposal.
Due to the metal entrapment in molten slag the metal gets spreads with molten slag. After cooling that area having metal gets hard and makes the process very much difficult.
Due to the metal entrapped in molten slag the metallic losses will be more and steel making yield decreases.
Due to the hardness of slag, the use of heavy earth mover is required for more period of time which results in noise pollution and fuel consumption is also more in this process.
Due to more cooling, dust formation will be more. Which results in equipments and machine required more maintenance. As the slag is loosen it is disposed/sent to MRP(metal recovery plant) to recover any metallic content that is present in the slag, this adds up to the cost of the process of steel making process. In MRP first the steel mix slag is charged in a hopper and passed through crushers, screens and numbers of conveyers. Then the crushed particles is passed over the magnetic separator there magnetic particle is recovered. The metal recovered will be in the form of coarse particles and also contains some slag particles. This slag has some amount of impurities like sulphur (S), phosphor (P), silica (Si02), alumina (AI203) etc. Which is uneconomical for reused if used it adds up to the cost of steel making.
This process of conventional Metal Recovery Plant (MRP) is very lengthy process and it takes more time and requires more area. In this process dust generation is more, which is not environmental friendly and also uses more electricity, water, land, fuel, manpower and other heavy equipments and earth movers. Safety parameter vise, conventional slag handling/process is very much unsafe.
Thus there has been always need for an apparatus and a method which would be adapted to facilitate the slag management procedure in a metal or steel making industry and solve the problem associated with the conventional Metal Recovery process. In other words the basic need was to develop an apparatus and a method which would efficiently recover metal content from the slag without generating dust and without involving electricity, water, land, fuel. Also the same apparatus will be adapted to dispose slag which is substantially free of metal in small manageable blocks.
SUMMARY OF THE INVENTION:
Thus according to the basic aspect of the present invention, is to provide an apparatus for handling metal containing slag inclusive of slag with tiny droplets of metal and metal recovery comprising a slag thimble having a base with surrounding side walls and an open top for metal containing slag and allowing settling of heavier metal contents below the top slag in thimble, handling slag in small batches and graduation/indication marks indicative of angle of tilt of the slag thimble enabling stepwise controlled pouring, said graduation/indication marks based tilting of said slag thimble for slag disposal based on level of heavier metal contents below the top slag whereby the slag thimble can be selectively initially angularly tilted for initial separation of the said top slag substantially free of metal contents for separate dumping followed by subsequently further angular tilt for separating the said heavier metal content remaining below said top slag for metal recovery. The slag thimble of the present apparatus comprises trunnion mounted on said slag thimble which comprises the graduation/indication marks indicative of the angle of tilt of the slag thimble for facilitating the controlled slag disposal and metal recovery based on the slag volume in said slag thimble. In a preferred embodiment of the present invention the said slag thimble may comprise a cooling arrangement detachably secured with outside of the slag thimble adapted to externally shell refrigeration of the slag thimble for maintaining temperature of the slag thimble near to room temperature for providing a lower
temperature gradient of the shell of the slag thimble with respect to the slag entering into the slag thimble.
According to another aspect in the present invention, the initial reference angle of tilt of the slag thimble for slag disposal are variable based on the shape and size of the thimble and its volume content and are selectively marked therein based on the functional dependence between the disposed or dumped amount of the liquid media and the angle of tilt of the slag thimble. The reference angle of tilt estimated based on the functional dependence between the disposed or dumped amount of the liquid media and the angle of tilt of the slag thimble includes indication of the angle tilt of the slag thimble for safe slag disposal of upto an amount of the entered slag which is substantially free of metal contents.
According to yet another aspect, the reference angle of tilt estimated based on the functional dependence between the disposed or dumped amount of the liquid media and the angle of tilt of the slag thimble and also includes indication of the angle of tilt of the slag thimble for disposal of slag having metal content inclusive of tiny droplets of metal after the initial disposal of entered slag which is substantially free of metal contents.
According another important aspect of the present invention, there is provided a system/kit for handling slag inclusive of tiny droplets of metal and metal recovery comprising a slag thimble having a base with surrounding side walls and an open top for containing metal containing slag and allowing settling of heavier metal contents below the top slag in thimble and graduation/indication marks indicative of angle of tilt of the slag thimble enabling stepwise controlled said graduation/indication marks based tilting of said slag thimble for slag disposal based on level of heavier metal contents below the top slag whereby the slag thimble can be selectively initially angularly tilted for initial separation of the said top slag substantially free of metal contents for separate dumping followed by subsequently further angular tilt for separating the said entrapped metal content remaining below said top slag for metal recovery; and mold means providing for disposal of slag
According to a further aspect in the present system/kit for handling metal free slag, the said mold means comprising plurality of mold with each mold having cavity wherein each said cavity is of volume 1 to 4 cubic meters. The said mold means for receiving disposed slag is
obtained of high Manganese cast steel and is hollow in the bottom or bottom closed and the thickness of mold side walls in the bottom is less than the thickness at the top.
According to yet another aspect of the present invention, there is provided a mold system for use in handling steel making slag and its ready disposal comprising : mold means structured for disposal of slag.
According to yet another aspect of the present mold system, the mold means comprises separate cavities with partitioning walls providing for said small blocks of slag and each of said small blocks of slag in the form of mold cavities of volume 1 to 4 cubic meter.
According to a further aspect in the present mold system, the said mold means is obtained of high Manganese cast steel and are hollow/ closed in the bottom and the thickness of mold in the bottom is less than the thickness at the top and having a through hole in a wall of said mold. The present mold system also comprises a slag bisector adapted for fixing into the mold after the slag pouring for enabling slag/metal recovery in smaller blocks. The said slag bisector is adapted also to act as a chiller.
According to another aspect in the present mold system, the said slag bisector comprises partitioning wall members which divide the mold into multiple mutually separate small compartment/blocks and having a handle means on top for facilitating the handling of the bisector with respect to said mold.
According to another aspect in the present mold system, the said mold cavity is selected of desired shape and configuration preferably selected from square cavity, conical cavity, rectangular cavity and elliptical cavity.
In accordance with another aspect of the present invention, there is provided a process for handling steel making slag inclusive of slag with tiny droplets of metal and metal recovery comprising :
Collecting slag in a slag thimble having means graduation/tilting indication for controlled slag disposal and maintained close to room temperature;
Allowing setting of heavier metal contents below the slag due to density difference of the heavier metal with rest of the slag and providing surface contact with the shell of the slag thimble maintained close to the room temperature;
Rapidly cooling the slag by utilizing lower temperature gradient of the shell of the slag thimble for facilitating the adhesion of the slag with the metal content with the shell of the slag container;
Stepwise controlling the tilting of the slag thimble for effective slag disposal whereby slag substantially free of metal contents separated by dumping in mold and subsequently the slag with the metal content recovered separately.
According to a further aspect in the present process, the said graduation/titling indication of said slag thimble is used for carrying out said slag separation preferably with carrying out tilting based on said angle graduations of up to 70 degrees for safe metal free slag disposal of up to some portion/quantity slag of the entered slag which is substantially free of metal contents into the mold cavities and producing small blocks of the slag for easy disposal. The remaining slag with the metal contents is cooled down in the thimble by placing the thimble in vertical position, including involving man cooler and/or sprays cooling external to thimble and thereby disposed by tilting the thimble at angle graduations beyond 70 degrees and up to 126 degrees. The metal is recovered from the disposed slag by chipping adhered top slag.
BRIEF DESCRIPTION OF THE ACCOMPANYING FIGURES:
Figure 1 shows schematic illustration of a preferred embodiment the present apparatus for handling metal containing slag inclusive of slag with tiny droplets of metal and metal recovery.
Figure 2 and 2(a) shows the schematic of the reference indicator wit trunnion associated with the apparatus of the present invention. Figure 3 shows initial disposal of the slag by tilting angle of slag thimble associated with the present invention.
Figure 4 shows tilting angle of the slag thimble for complete disposal of the recovered metal in accordance with the present invention.
Figure 5(a)-(c) shows the different view of a preferred embodiment of the mold for receiving disposed metal free slag.
Figure 6 shows a schematic illustration of a preferred embodiment of a slag bisector adapted for fixing into the mold for receiving disposed metal free slag.
Figure 7(a)-(b) shows a schematic illustration of steel vessel for receiving disposed bottom slag with higher metal content. Figure 8 shows the process flow for the recovery of metal from the slag in accordance with the present invention.
DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING FIGURES:
The present invention is directed to favour slag management and metal recovery process in a metal processing industry. In particular the present invention is discloses an apparatus and a process for facilitating the metal recovery process from the slag and thereby facilitating the handling of the slag. The apparatus basically includes a slag container with specially developed turnions with graduation/indication marks indicative of the angle of tilt of the slag container based on which metal content present in the slag in the form of tiny droplets of metal is separated.
A schematic illustration of a preferred embodiment the present apparatus is provided in the accompanying figure 1. As shown in the said figure the slag container or the slag thimble (1) comprises an curved base (3) in which concaved side of base faces along stream of molten slag entering into said slag container and surrounding side wall (2) around entire periphery of the base upwardly extended from the bottom of the slag container defining the slag containing space. Even numbers of outwardly extended turnions (6) are mounted on the said slag thimble which is adapted to be attached with any structure or hook of a crane. In the present invention the slag thimble is provided for receiving the molten slag (4) and allowing the received molten slag for settling of heavier metal contents (5) below the slag in small batches near to the shell of the slag thimble. In the present invention, the slag thimble is kept close to room temperature so that during slag off/dumping the slag comes in contact to the thimble shell, rapidly cools down due to lower temperature gradient of shell of the thimble with respect to the entered/dumped slag. Due to the rapid cooling, the slag nearer to the shell of the slag thimble adhered with the shell of the slag thimble. The slag adheres to the surface of the slag thimble generally weighs around 25% of total dumped slag quantity.
Then the slag thimble is transported to the slag yard and the slag within the thimble is then poured into specially designed mold which are made only for this purpose for solidifying the dumped slag into small manageable blocks. In a preferred embodiment of the present invention, the slag thimble comprises a cooling arrangement detachably secured with outside of the slag thimble. This cooling arrangement externally refrigerate shell of the slag thimble for maintaining temperature of the slag thimble near to room temperature and providing a lower temperature gradient of the shell of the slag thimble with respect to the slag entering into the slag thimble. During the disposal of the slag in the mold the tilting angle of the slag thimble is controlled for favoring the metal recovery from the slag. The trunions associated with the slag thimble of the present invention comprises reference indicator such as angle graduation/indication marks (as shown in the accompanying figure 2 and 2(a)), which are indicative of the angle of tilt of the slag thimble based on the level of entrapped metal contents beiow the top slag. For enabling controlled and stepwise tilting of the slag thimble for slag disposal, the slag thimble can be selectively tilted for initial separation of top slag which is substantially free of metal contents by dumping while subsequently the said heavier metal content of said slag remaining below can be recovered separately by further tilting the slag thimble. During the initial tilting of the slag thimble as shown in the accompanying figure 3, some portion of the entered/damped slag which are not adhered to the surface of the slag thimble and substantially metal free slag is poured into the mold for such slag. The initial tilting angle of the slag thimble is about 70 degrees.
The remaining below the top slag is basically slag with tiny droplets of metal in slag thimble. This remaining is allowed to settle down and cool in the thimble itself, cooled either with the help of man cooler/atmospheric air from the external of slag thimble and then the slag thimble is tilted upon beyond 70 degrees and up to 126 degrees (as shown in the accompanying figure 4) for disposal of the remaining slag with the entrapped tiny droplets of metals. The top slag layer is then chipped off for recovering the metal which can be used as scrap (coolant) without any further processing. In case if the entrapped metal quantity is more (preferably more that 3 tons) it is poured immediately in steel vessel (as shown in the accompanying figures 7 and 7(a)) and cooled down for solidification. After solidification of the steel vessel is rotated upside-down to obtain the solidified mass.
Subsequently/parallel the slag poured initially in the mold is also cooled for 40minuts-lhour and slag is recovered from the mold. The slag obtained will be in a form of small block which is free from metal and easy to dispose due to a small block of slag . Reference is next invited from the accompanying figures 5(a)-(c) which shows the different view of a preferred embodiment of the mold for receiving the disposed metal free slag. As shown in the referred figure, the mold for disposal of slag metal in small blocks comprises multiple cavities (7) of volume 1 to 4 cubic meter having side walls (9) with gradually decreasing thickness from top of the side wall to bottom of the side wall with hollow/closed bottom end. These multiple cavities combined in a single structure (8) but separated from each other with partitioning walls to form the mold means for solidifying the slag in the small blocks.
The cavities of the mold means are selected of desired shape and configuration preferably selected from square cavity, conical cavity, rectangular cavity and elliptical cavity.
The said mold means are kept on a leveled ground so that after solidification of the slag, the mold can be lifted up using EOT crane and the small blocks of solid slag remain on the ground. These small blocks can be managed easily. The said mold means for receiving disposed slag is preferably obtained of high Manganese cast steel. In a preferred embodiment of the mold means a through hole is provided on the wall of said cavities.
Reference is next invited from the accompanying figure 6 and 6(a), which shows a schematic illustration of a preferred embodiment of a slag bisector adapted for fixing into the mold after the slag pouring for enabling slag/metal recovery in small blocks. As shown in the said figure the slag bisector comprises interpenetrating vertical partitioning wall (10) members having gradually decreasing thickness from top of the vertical wall to bottom of the vertical wall (11) . These bisectors divide the mold into multiple mutually separate small compartment/blocks and . A handle means (12) is attached on top of the said bisectors for facilitating the handling of the bisector with respect to said mold. These slag bisectors are also adapted to act as a chiller.
Reference is next invited from the accompanying figure 8 which shows the process flow of the recovery of metal content from the slag. As shown in the referred figure, in the process for recovery of metal content from the slag comprises the slag is dumped in the slag thimble having means for graduation/tilting indication for controlled slag disposal and maintained at the room temperature. After dumping the slag is then allowed to settle so that metal contents in the slag which has higher density with respect to the rest of the slag deposit below the slag and comes in contact with the shell of the slag thimble maintained at the room temperature. This slag with the metal content nearer to the surface of the slag thimble is cooled by using the lower temperature gradient of the shell of the slag thimble. The initial tilting is carried out based on angle graduations for disposal of slag which are not adhered to the shell of the slag thimble and substantially free of metal and thereby separating from the slag with the metal content adhered to the shell of the slag thimble.
In this process the graduation/titling indication of said slag thimble is used for carrying out said slag and metal separation the proportion of total slag entered into the said slag thimble which is substantially free of metal and not adhered to the surface of the slag thimble and the remaining proportion of the total slag having metal contents which is adhered to the surface of the slag thimble is determined by studying the nature of slag. After then, the angle for initial and subsequent tilting adapted for safe slag disposal of the determined proportion of the slag which is substantially free of metal and slag having metal contents is determined from the graduation/indication marks which are indicative of angle of tilt of the slag thimble for safe slag disposal. The graduation/indication marks indicative of angle of tilt of the slag thimble for slag disposal can vary depending on the shape and size of the thimble and its volume content and are selectively marked therein based on the functional dependence between the disposed or dumped amount of the liquid media and the angle of tilt of the slag thimble. The graduation/indication marks for any particular slag thimble is determined by performing a test dumping process. First the slag thimble for which the graduation/indication marks is to be determined is first filled with a liquid media. Then the slag thimble is gradually tilted for dumping the liquid media from the said slag thimble. During the gradual tilting, the gradual variation of the angle of tilt of said slag thimble and disposed or dumped amount of the liquid media is continuously measured. The functional dependence between the disposed or dumped amount of the liquid media and the angle of tilt of the slag thimble form the continuously measured angle of tilt and the dumped amount of the liquid media is determined. The initial reference angle of tilt for the slag thimble is
then determined based on said functional dependence which indicates the angle of tilt of the slag thimble for disposal of requisite amount of the liquid media stored in the slag thimble.
The said graduation/indication marks created based on the functional dependence between the disposed or dumped amount of the liquid media and the angle of tilt of the slag thimble indicates the angle tilt of the slag thimble for safe slag disposal of proportion of the entered slag which is substantially free of metal contents. Also the same graduation/indication marks indicates the angle of tilt of the slag thimble for disposal of slag having metal content inclusive of tiny droplets of metal after the initial disposal of entered slag which is substantially free of metal contents.
In a preferred process embodiment, the graduation/titling indication of said slag thimble is used for carrying out said slag and metal separation preferably with carrying out tilting based on said angle graduations of up to 70 degrees for safe slag disposal of up to 75 % of the dumped slag which are substantially free of metal and subsequently cooling the remaining slag in the thimble and thereby separately carrying out tilting at subsequent angle graduations beyond 70 degrees and upto 126 degrees of thimble which dispose the slag having metal contents. After solidification of the slag having metal contents the metals are recovered by chipping the top slag form the disposed slag.
Claims
1. An apparatus for handling metal containing slag inclusive of slag with tiny droplets of metal and metal recovery comprising: a slag thimble having a base with surrounding side walls and an open top for containing metal containing slag and allowing settling of heavier metal contents below the top slag in small batches and graduation/indication marks indicative of angle of tilt of the slag thimble enabling stepwise controlled said graduation/indication marks based tilting of said slag thimble for slag disposal based on level of heavier metal contents below the top slag whereby the slag thimble can be selectively initially angularly tilted for initial separation of the said top slag substantially free of metal contents for separate dumping followed by subsequently further angular tilt for separating the said heavier metal content remaining below said top slag for metal recovery.
2. The apparatus as claimed in claim 1, wherein the slag thimble comprises trunnion mounted on said slag thimble which comprises the graduation/indication marks indicative of the angle of tilt of the slag thimble for facilitating the controlled slag disposal.
3. The apparatus as claimed in anyone of claim 1 or 2, wherein the said angle graduations and its related titling indications for said controlled slag disposal and metal recovery is based on the slag volume in said slag thimble.
4. The apparatus as claimed in anyone of claims 1 to 3, wherein the said slag thimble may comprise cooling arrangement detachably secured with outside of the slag thimble adapted to externally refrigerate shell of the slag thimble for maintaining temperature of the slag thimble near to room temperature for providing a lower temperature gradient of the shell of the slag thimble with respect to the slag entering into the slag thimble.
The apparatus as claimed in anyone of claims 1 to 4, wherein initial reference angle of tilt of the slag thimble are variable based on the shape and size of the thimble and its volume content and are selectively marked therein based on the functional dependence between the disposed or dumped amount of the liquid media and the angle of tilt of the slag thimble.
The apparatus as claimed in anyone of claims 1 to 5, wherein the said graduation/indication marks are based on the functional dependence between the disposed or dumped amount of the liquid media and the angle of tilt of the slag thimble, includes indication of the angle tilt of the slag thimble for safe slag disposal of upto an amount of the entered slag which is substantially free of metal contents.
The apparatus as claimed in anyone of claims 1 to 6, wherein the said reference tilt angle estimated based on the functional dependence between the disposed or dumped amount of the liquid media and the angle of tilt of the slag thimble includes indication of the angle of tilt of the slag thimble for disposal of slag having metal content inclusive of tiny droplets of metal after the initial disposal of entered slag which is substantially free of metal contents.
A system/kit for handling slag inclusive of tiny droplets of metal and metal recovery comprising : a slag thimble having a base with surrounding side walls and an open top for containing metal containing slag and allowing settling of heavier metal contents below the top slag in small batches and graduation/indication marks indicative of angle of tilt of the slag thimble enabling stepwise controlled said graduation/indication marks based tilting of said slag thimble for slag disposal based on level of heavier metal contents below the top slag whereby the slag thimble can be selectively initially angularly tilted for initial separation of the said top slag substantially free of metal contents for separate dumping followed by subsequently further angular tilt for separating the said heavier metal content remaining below said top slag for metal recovery; and mold means providing for disposal of slag/ slag inclusive of tiny droplets of metal in small blocks.
9. A system/kit as claimed in claim 8, wherein said mold means comprising plurality of mold with each mold having cavity wherein each said cavity is of volume 1 to 4 cubic meter.
10. A system/kit as claimed in anyone of claims 8 or 9 wherein said mold means for receiving disposed slag is obtained of high Manganese cast steel and are hollow in the bottom and the thickness of mold side walls in the bottom is less than the thickness at the top.
11. A system/kit as claimed in claim 8, wherein said mold means for receiving disposed slag inclusive of tiny droplets of metal comprises plurality steel vessel.
12. A mold system for use in handling steel making slag and its ready disposal comprising : mold means structured for disposal of slag.
13. A mold system as claimed in claim 12 wherein said mold means comprises separate cavities with partitioning walls providing for said small blocks of slag.
14. A mold system as claimed in anyone of claims 12 or 13 providing for said each said small block of slag in the form of mold cavities of volume 1 to 4 cubic meter.
15. A mold system as claimed in anyone of claims 12 to 14 which is obtained of high Manganese cast steel and are hollow in the bottom and the thickness of mold in the bottom is less than the thickness at the top and having a through hole in a wall of said mold.
16. A mold system as claimed in claim 15 comprising a slag bisector adapted for fixing into the mold after the slag pouring for enabling slag/metal recovery in small blocks.
17. A mold system as claimed in claim 16 wherein said slag bisector is adapted to act as a chiller.
18. A mold system as claimed in anyone of claims 15 or 16 wherein said slag bisector comprises partitioning wall members which divide the mold into multiple mutually
separate small compartment/blocks and having a handle means on top for facilitating the handling of the bisector with respect to said mold.
19. A mold system as claimed in anyone of claims 15 or 16 wherein said slag bisector comprises
A mold system as claimed in anyone of claims 11 to 14 wherein said mold cavity is selected of desired shape and configuration preferably selected from square cavity, conical cavity, rectangular cavity and elliptical cavity.
20. A process for handling steel making slag inclusive of slag with tiny droplets of metal and metal recovery involving the system as claimed in anyone of claims 1 to 19 comprising :
Collecting the slag in said slag thimble having means graduation/tilting indication for controlled slag disposal and maintained at the room temperature; allowing setting of entrapped metal contents below the slag due to density difference of the heavier metal with rest of the slag and providing surface contact with the shell of the slag thimble maintained at the room temperature; rapidly cooling the slag by utilizing lower temperature gradient of the shell of the slag thimble for facilitating the adhesion of the slag with the metal content with the shell of the slag container; stepwise controlling the tilting of the slag thimble for effective slag disposal whereby slag substantially free of metal contents separated by dumping and subsequently the slag with the metal content recovered separately.
21. A process as claimed in claim 20 wherein said graduation/titling indication of said slag thimble is used for carrying out said slag separation preferably with carrying out tilting based on said angle graduations of up to 70 degrees for safe slag disposal of up to 75 % of the entered slag which is substantially free of metal contents into the mold cavities and producing small blocks of the slag for easy disposal.
22. A process as claimed in anyone of claims 21 or 22 wherein remaining slag with the metal contents is cooled down in the thimble including involving man cooler and/or spray
cooling and thereby disposed by tilting the thimble at angle graduations beyond 70 degrees and up to 126 degrees.
23. A process as claimed in claim 22, wherein the metal is recovered from the disposed slag by chipping excess slag.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IN5027/CHE/2013 | 2013-11-08 | ||
| IN5027CH2013 | 2013-11-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2015068172A1 true WO2015068172A1 (en) | 2015-05-14 |
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ID=53040991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IN2014/000314 WO2015068172A1 (en) | 2013-11-08 | 2014-05-08 | Method and apparatus for handling steel making slag and metal recovery |
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| Country | Link |
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| WO (1) | WO2015068172A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3192875A (en) * | 1962-01-31 | 1965-07-06 | William B Pollock Company | Dumping apparatus for a vehicle mounted tilting slag pot |
| CN1112266A (en) * | 1994-01-12 | 1995-11-22 | 有限会社米帝木兹 | Expressing object for sight disabled people formed with transparent three dimensional ink |
| US5968230A (en) * | 1994-12-08 | 1999-10-19 | Daido Tokushuko Kabushiki Kaisha | Method and furnace for disposal of steel-making waste, and operating method of the furnace |
| US6197086B1 (en) * | 1997-11-13 | 2001-03-06 | Bethlehem Steel Corporation | System and method for minimizing slag carryover during the production of steel |
| US7819170B2 (en) * | 2003-06-24 | 2010-10-26 | Novelis Inc. | Method for casting composite ingot |
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2014
- 2014-05-08 WO PCT/IN2014/000314 patent/WO2015068172A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3192875A (en) * | 1962-01-31 | 1965-07-06 | William B Pollock Company | Dumping apparatus for a vehicle mounted tilting slag pot |
| CN1112266A (en) * | 1994-01-12 | 1995-11-22 | 有限会社米帝木兹 | Expressing object for sight disabled people formed with transparent three dimensional ink |
| US5968230A (en) * | 1994-12-08 | 1999-10-19 | Daido Tokushuko Kabushiki Kaisha | Method and furnace for disposal of steel-making waste, and operating method of the furnace |
| US6197086B1 (en) * | 1997-11-13 | 2001-03-06 | Bethlehem Steel Corporation | System and method for minimizing slag carryover during the production of steel |
| US7819170B2 (en) * | 2003-06-24 | 2010-10-26 | Novelis Inc. | Method for casting composite ingot |
| US8312915B2 (en) * | 2003-06-24 | 2012-11-20 | Novelis Inc. | Method for casting composite ingot |
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