GB2104634A - Method and apparatus for drying and degreasing swarf - Google Patents
Method and apparatus for drying and degreasing swarf Download PDFInfo
- Publication number
- GB2104634A GB2104634A GB08219702A GB8219702A GB2104634A GB 2104634 A GB2104634 A GB 2104634A GB 08219702 A GB08219702 A GB 08219702A GB 8219702 A GB8219702 A GB 8219702A GB 2104634 A GB2104634 A GB 2104634A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dryer
- burner
- swarf
- heater
- duct
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/56—Manufacture of steel by other methods
- C21C5/562—Manufacture of steel by other methods starting from scrap
- C21C5/565—Preheating of scrap
-
- 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
- C22B1/005—Preliminary treatment of scrap
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
- C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
- C21B2100/66—Heat exchange
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The apparatus comprises a rotary dryer (10) with swarf fed through a duct (11) and an after-burner/heater (16) connected so that a proportion of hot gases from the after-burner/heater are supplied to the dryer and the gases from the dryer outlet pass back to the after-burner/heater for any combustible content therein to serve as at least part of the fuel for the after- burner/heater. <IMAGE>
Description
SPECIFICATION
Method of and apparatus for drying and degreasing swarf
This invention concerns a method of and apparatus for drying and degreasing swarf, which term, as used herein, includes all kinds of metallic waste material in the form of particles, chips, strips, strands and other small pieces arising in all kinds of industrial and other processes, e.g. in the production and machining of metal products, and metal reclamation.
The recycling of swarf to melting furnaces is widely practised in both the ferrous and nonferrous industries. However, such swarf is almost invariably contaminated with liquid contaminants, such as cutting oil or cooling fluid.
There are some melting operations wherein the introduction of contaminated swarf is completely unacceptable because of the consequential contamination of the molten metal. In these cases, it is indispensable for the swarf to be subjected to efficient drying and degreasing.
There are, of course, some melting operations in which the presence of oil and/or water in sward supplied to the melting furnace is not regarded as disadvantageous insofar as concerns the molten metal itself. However, substantial quantities of fumes are generated by the contaminants in the melting process and these have to be disposed of.
In general it is not permissible to discharge the fumes untreated into the atmosphere and elimination thereof can be achieved only at considerable cost. For this reason it is the preferred practise to subject this swarf also to drying and degreasing before it is added to the melting furnace.
Drying and degreasing processes involving detergents and/or solvents, sometimes involving some measure of oil recovery, are already known.
In general, however, these detergent and solvent processes tend to leave residual contaminants on the swarf, which is disadvantageous for the reasons above discussed. It is preferred, therefore, to subject the swarf to heat treatment, e.g. by passing it through a dryer, at a high enough temperature to vaporise or decompose any oil and to turn any water into steam. The application of heat is usually effected by directing the products of combustion from a burner through the dryer, and at one time it was established practice to discharge the gaseous effluent from the dryer directly into the atmosphere.This effluent, also, is of a noxious nature, and consequently it has more recently become practice to pass the effluent through an after-burner or incinerator unit which is intended to result in oxidation of all combustible material contained therein, so that the final discharge to atmosphere does not include any undesirable content.
An entirely acceptable discharge may be obtained in this way but the after-burner has to operate at a higher temperature than the dryer and commonly involves a considerable fuel usage.
In all swarf drying using a dryer unit and an afterburner any oil on the swarf contributes to the heat input. With very oily swarf it is sometimes possible, after initial start-up, to operate without any additional fuel input to the after-burner. In other circumstances, the vaporised oil can reduce the fuel input to the after-burner. In all the known proposals, however, there is still, overall, a large thermal input to the dryer and after-burner per tonne of dry degreased swan', if the fume discharge is to be free from offense. Accordingly, attempts over many years to achieve a clean (i.e.
fully burnt) fume discharge have all failed except when the amount of fuel burnt per tonne of swarf has been large and the cost uneconomically high.
An object of the present invention is to provide a swarf drying and degreasing method which is
significantly more economical and efficient than those hitherto employed, in that it will achieve a
clear gaseous effluent discharge with the use of a substantially lesser amount of added fuel.
It is also to be mentioned that in the drying and degreasing of combustible swards, such as of aluminium and titanium, it sometimes happens that clean exhaust gas emission is achieved with an unexpectedly low fuel consumption. This can arise, in practice, as a result of combustion of a proportion (which may exceed 1%) of the swan'.
Any significant consumption of the metal can be uneconomical; and accordingly it is a further object of the invention to provide a drying and degreasing method wherein the possibility of metal being consumed by combustion in the dryer is minimised or obviated.
With this object in view, the present invention provides a method of drying and degreasing swarf in which the swarf is subjected to a heat treatment in a rotary dryer, characterised in that the dryer is heated by supplying thereto a proportion of the hot exhaust gases from an
after-burner/heater and supplying outlet gas from the dryer back to the after-burner/heater so that any combustible content in the outlet gas serves as at least part of the fuel consumed by the afterburner/heater.
The invention further includes apparatus for drying and degreasing swarf including a rotary dryer for the heat treatment of the swarf therein, characterised by the provision of an afterburner/heater which is connected to the rotary dryer so as to supply thereto a proportion of its hot exhaust gases, a gas outlet from the dryer being connected to the after-burner/heater to enable outlet gas from the dryer to pass back to the after-burner/heater for any combustible
content therein, to serve as at least part of the fuel consumed by the after-burner/heater.
The invention will be described further, by way of example, with reference to the accompanying drawing, in which the single figure is a diagrammatic illustration of a preferred embodiment of the apparatus of the invention.
As illustrated in the drawling, the preferred embodiment of the apparatus of the invention comprises a rotary dryer 10. This is fitted internally with a plurality of lifting flights (not shown) the function of which is to take up particulate content of the dryer when the latter rotates, at the bottom of the latter, to lift such material, and then to shower it back to the bottom of the dryer so as to be brought to an elevated temperature for drying and degreasing by hot gas passing through the dryer.
Swarf to be dried and degreased is supplied into the dryer 10, by way of a swarf feed duct 11, at one end, and the internal structure and arrangement of the flights is to cause such swarf to progress through the dryer 10 axially to a solid product outlet 12.
An outlet gas duct 1 3 from the dryer 10 connects by way of a duct-separator or cyclone 14 to an exhaust/recycle fan 1 5 which serves to supply outlet gas from the dryer to an afterburner/heater 16. In turn, an exhaust duct 17 from the after-burner/heater 1 6 connects with a recycle duct 1 8 having a proportioning control damper 1 9 and leading to a gas inlet 20 of the rotary dryer 10, and to a discharge duct 21, having a respective proportioning control 22, leading to atmosphere.
The after-burner/heater 1 6 has a burner 23 to which is connected a fuel inlet 24, for fuel such as gas, and a combustion air fan 25. The burner 23 is controlled by a temperature indicating controller 26 which senses the temperature prevailing in the exhaust duct 17.
An air connection 27 serves to supply air to the outlet gas duct 13 between the cyclone 14 and the exhaust/recycle fan 1 5, under the control of an oxygen analyser 28 which serves to sense and indicate the oxygen content in the gas passing from the exhaust/recycle fan 1 5 to the afterburner/heater 1 6. A control damper 29 is provided in the outlet gas duct 1 3 between the air connection 27 and the exhaust/recycle fan 1 5.
A water-injector 30 is provided on the recycle duct 18. This is connected to a water supply pipe 31 and has an actuator 32 connected by way of a line 33 to a temperature-indicating controller 34 which serves to sense the temperature prevailing in the outlet gas duct 1 3. This water-injector 30 is a means of controlling the heat input at the dryer to prevent overheating. It should be noted that for efficient elimination of obnoxious fumes and vapours, tha after-burner/heater 1 6 must produce a temperature in the duct 1 7 typically in the range 6000--9000C, and this might be too high for some materials beind handled.
Safety equipment of the apparatus includes a flame detection alarm and interlock unit 35 coupled with the rotary dryer 10. This serves to monitor the interior of the dryer 10 and, in the event of sensing the presence of a flame therein, to quench the contents of the dryer 10 by injecting carbon dioxide therein by way of nozzles 36.
Instrumentation provided in the apparatus comprises: temperature recorders (TR) 37, 38, 39 and 40 connected respectively with the outlet gas duct 13, the exhaust duct 17, the recycle duct 1 8 and the solid product outlet 12; pressure switches
(PS) 41,42 connected respectively to the outlet gas duct 1 3 between the exhaust/recycle fan 15 and the after-burner/heater 16, and to the connection between the combustion air fan 25 and the burner 23 of the after-burner/heater 1 6; pressure indicators (PI) 43, 44, 45 connected respectively to the outlet gas duct 1 3 between the dryer 10 and the cyclone 14, to the same duct 1 3 between the cyclone 14 and the exhaust/recycle fan 15, and to the gas inlet 20 of the dryer 10; and indicator lamps (1) 46, 47, 48, 49, 50, 51, 52 connected to and serving to indicate the operative conditions respectively of the carbon dioxide nozzles 36, the flame detection alarm and interlock unit 35, the exhaust/recycle fan 15, the combustion air fan 25, the temperature indicating controller 26, the temperature indicating controller 34, and the oxygen analyser 28.
The manner of operation of the apparatus will readily be understood from the foregoing description.
Metal swarf to be dried and degreased is fed at an appropriate rate into the one end of the rotary dryer 10 and the latter is rotated so that such swarf is both elevated and showered, and progressed axially through the dryer as already described above, to emerge by way of the solid product outlet 12.
Upon initial starting up, fuel is supplied to and burnt at the bumer 23, with the aid of air supplied by the combustion air fan 25 and the resultant hot gaseous products of combustion are supplied to the dryer 10, to pass therethrough for subjecting the swarf to a sufficiently high temperature treatment to drive off all oil, water and any other vaporisable foreign matter or contaminant present on the swan'. Propulsion of the gaseous combustion products through the dryer 10 and the cyclone 14 is effected by the exhaust/recycle fan 15, and the circulation of such products as well as the discharge of a proportion thereof by way of the discharge duct 21 is controlled by means of the controls 19, 22 and 29.
The recirculating gases passing from the dryer to the after-burner/heater 16, freed from entrained solid particles, by the cyclone 14, carry with them vaporised oil and this serves, of course,
as a fuel for the after-burner/heater 1 6.
Accordingly, as the apparatus settles down in its
operation, the amount of fuel needed to be supplied to the after-burner/heater 1 6 progressively diminishes. In some instances, where the swarf being dried and degreased initially contains a high oil proportion, the arrangement may operate without any fuel being supplied by way of the fuel inlet 24.
The oxygen analyser 28 serves, of course, to analyse the recirculating gas between the fan 1 5 and the after-burner/heater 1 6 and, if appropriate, to admit atmospheric air thereto.
Correspondingly, the temperature indicating controller 34 senses the temperature of the gases emerging from the dryer 10 and in the event that this temperature is too high, it actuates the water injector 30 to cause cooling water to be injected into the recirculating hot gases supplied to the gas inlet 20.
In the event of the undesired appearance of flames in the dryer 10, the flame detection alarm and interlock unit 35 operates as already described to quench the flames with carbon dioxide; it serves also to switch off the apparatus.
A particular advantage of the apparatus of the invention and the manner in which it operates lies in the fact that the hot gases actually supplied to the dryer are relatively impoverished of oxygen which has, in the main, been consumed in the combustion occurring in the after-burner/heater 1 6. Accordingly, any risk of an explosive mixture arising within the rotary dryer is substantially eliminated. Similarly, the risk of oxidation or combustion of swarf materials such as aluminium or titanium is also eliminated.
The invention is not confined to the precise details of the foregoing example and variations may be made thereto. Thus, of course, the water injector 30, the oxygen analyser 28, and the flame detection alarm and interlock 35, for instance, are refinements which may, if desired be omitted. As an alternative to using water-injector 30, it is possible to reduce the temperature of the recycled gases to a level acceptable at the inlet to the dryer 10 by inclusion of a suitable heat exchanger(s) in duct 18, which would effect recovery of the surplus heat and would enable it to be used, for example, for steam raising or the production of hot water or hot air. The heat content of the exhaust gases passing to atmosphere through duct 21 might similarly be recovered, or alternatively a single heat recovery system might be positioned in the exhaust from the after-burner in duct 17. Some of the heat recovered in this way might be used to pre-heat the fresh air entering through duct 27 and combustion air fan 25 and thus further reduce the fuel input at the after-burner.
Claims (20)
1. A method of drying and degreasing swarf in which the swarf is subjected to a heat treatment in a rotary dryer, characterised in that the dryer is heated by supplying thereto a proportion of the hot exhaust gases from an after-burner/heater and supplying outlet gas from the dryer back to the after-burner/heater so that any combustible content to the outlet gas serves as at least part of the fuel consumed by the after-burner/heater.
2. A method as claimed in claim 1 wherein the swarf to be dried and degreased is fed at an appropriate rate into one end of the rotary dryer and the latter is rotated so that such swarf is both elevated and showered, and progressed axial through the dryer to emerge by way of a solid product outlet.
3. A method as claimed in claim 1 or 2 wherein fuel is supplied to and burnt in a burner, with the aid of air supplied by a combustion air fan and the resultant hot gaseous products of combustion are supplied to the dryer, to pass therethrough for subjecting the swarf to a sufficiently high temperature treatment to drive off all oil, water and any other vaporisable foreign matter or contaminant present on the swan'.
4. A method as claimed in claim 3 wherein propulsion of the gaseous combustion products through the dryer and a subsequently connected cyclone is effected by an exhaust/recycle fan, and circulation of such products as well as the discharge of a proportion thereof by way of a discharge duct is appropriately controlled.
5. A method as claimed in any preceding claim wherein analysis of the recirculated gas between the fan and the after-burner/heater and, if appropriate, addition of air thereto, is effected by use of an oxygen analyser.
6. A method as claimed in any preceding claim wherein any flames in the dryer are quenched with carbon dioxide by a flame detection and interlock unit.
7. A method of drying and degreasing swarf substantially as hereinbefore described with reference to the accompanying drawing.
8. Apparatus for drying and degreasing swarf comprising a rotary dryer for the heat treatment of the swarf therein, characterised by the provision of an after-burner/heater which is connected to the rotary dryer so as to supply thereto a proportion of its hot exhaust gases, a gas outlet from the dryer being connected to the afterburner/heater to enable outlet gas from the dryer to pass back to the after-burner/heater for any combustible content therein, to serve as at least part of the fuel consumed by the afterburner/heater.
9. Apparatus as claimed in claim 8 wherein the dryer comprises a swarf feed duct, at one end, and a solid product outlet at its other end, and a plurality of internal flights which take up the swarf when the dryer rotates and progress it through the dryer to the solid product outlet.
10. Apparatus as claimed in claim 8 or 9 wherein the dryer has an outlet gas duct connected by way of a dust-separator or cyclone to an exhaust recycle fan which serves to supply outlet gas from the dryer to the after-burner/heater.
11. Apparatus as claimed in claims 8, 9 or 10 wherein the after-burner/heater comprises an exhaust duct connected to a recycle duct, having a proportioning control damper and leading to a gas inlet of the rotary dryer, and to a discharge duct having a respective proportioning control damper leading to atmosphere.
12. Apparatus as claimed in any preceding claim wherein the after-burner/heater has a burner to which is connected a fuel inlet for fuel such as gas and a combustion air fan.
13. Apparatus as claimed in claim 12 wherein the burner is controlled by a temperature indicating controller which senses the temperature prevailing in the exhaust duct.
14. Apparatus as claimed in claim 10 wherein an air connection is connected to the outlet gas duct between the cyclone and the exhaust/recycle fan to supply air to the duct under the control of an oxygen analyser which serves to sense and indicate the oxygen content of the gas passing from the exhaust/recycle fan to the afterburner/heater.
1 5. Apparatus as claimed in claim 14 wherein a control damper is provided in the outlet gas duct between the air connection and the exhaust/recycle fan.
16. Apparatus as claimed in claim 11 wherein a water-injector is provided on the recycle duct.
1 7. Apparatus as claimed in claim 1 6 wherein the water-injector is connected to a water supply pipe and has an actuator connected by way of a line to a temperature-indicating controller which serves to sense the temperature prevailing in the outlet gas duct.
18. Apparatus as claimed in claim 11 wherein the exhaust from the after-burner is passed through a heat exchanger or heat exchangers which serve to reduce the temperature of the recycled gases whilst recovering the surplus heat, and/or to recover heat from gases exhausted to the atmosphere.
19. Apparatus as claimed in any preceding claim wherein the rotary dryer further comprises a flame detection alarm and interlock unit which monitors the interior of the dryer and, in the event of sensing the pressure of flames therein, quenches the contents of the dryer by injecting carbon dioxide therein.
20. Apparatus for drying and degreasing swarf substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8219702A GB2104634B (en) | 1981-08-25 | 1982-07-08 | Method of and apparatus for drying and degreasing swarf |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8125875 | 1981-08-25 | ||
| GB8219702A GB2104634B (en) | 1981-08-25 | 1982-07-08 | Method of and apparatus for drying and degreasing swarf |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2104634A true GB2104634A (en) | 1983-03-09 |
| GB2104634B GB2104634B (en) | 1984-12-05 |
Family
ID=26280564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8219702A Expired GB2104634B (en) | 1981-08-25 | 1982-07-08 | Method of and apparatus for drying and degreasing swarf |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2104634B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0229828A1 (en) * | 1985-06-28 | 1987-07-29 | Aluminum Co Of America | Process for removing volatiles from the surface of aluminium. |
| EP0253596A1 (en) * | 1986-07-12 | 1988-01-20 | McKechnie Metals Limited | Process for drying swarf or other small items contaminated with volatile substances |
| EP0373673A2 (en) * | 1988-12-16 | 1990-06-20 | GILLESPIE & POWERS, INC. | Apparatus and process for removing volatile coatings from scrap metal |
| EP0451323A2 (en) * | 1990-04-09 | 1991-10-16 | BLUFIN S.r.l. | Method for preheating scrap iron by pyrolysis of resinous residues contained therein, with total recovery of their energy content and improvement of the steelmaking cycle |
| EP0592723A1 (en) * | 1992-10-13 | 1994-04-20 | Techint Compagnia Tecnica Internazionale S.P.A. | Continuous scrap preheating |
| US6227847B1 (en) | 1998-08-06 | 2001-05-08 | Gillespie & Powers, Inc. | Apparatus and process for removing volatile coatings from scrap metal |
| WO2018218113A1 (en) * | 2017-05-26 | 2018-11-29 | Novelis Inc. | Fluid temperature control system and method for decoating kiln |
| WO2020056084A1 (en) * | 2018-09-12 | 2020-03-19 | Novelis Inc. | Cooling system and method for decoaters |
-
1982
- 1982-07-08 GB GB8219702A patent/GB2104634B/en not_active Expired
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0229828A1 (en) * | 1985-06-28 | 1987-07-29 | Aluminum Co Of America | Process for removing volatiles from the surface of aluminium. |
| EP0229828A4 (en) * | 1985-06-28 | 1987-10-27 | Aluminum Co Of America | Process for removing volatiles from the surface of aluminium. |
| EP0253596A1 (en) * | 1986-07-12 | 1988-01-20 | McKechnie Metals Limited | Process for drying swarf or other small items contaminated with volatile substances |
| EP0373673A2 (en) * | 1988-12-16 | 1990-06-20 | GILLESPIE & POWERS, INC. | Apparatus and process for removing volatile coatings from scrap metal |
| EP0373673A3 (en) * | 1988-12-16 | 1991-01-09 | GILLESPIE & POWERS, INC. | Apparatus and process for removing volatile coatings from scrap metal |
| EP0451323A2 (en) * | 1990-04-09 | 1991-10-16 | BLUFIN S.r.l. | Method for preheating scrap iron by pyrolysis of resinous residues contained therein, with total recovery of their energy content and improvement of the steelmaking cycle |
| EP0451323A3 (en) * | 1990-04-09 | 1992-07-29 | Blufin S.R.L. | Method for preheating scrap iron by pyrolysis of resinous residues contained therein, with total recovery of their energy content and improvement of the steelmaking cycle |
| TR25626A (en) * | 1990-04-09 | 1993-07-01 | Blufin Srl | SCRAPE IRON HAS BEEN EXPOSED TO THE PREHEATMENT THAT IS INSERTED BY THERMAL PROCESS, PREHEATING IT, THEIR ENERGY CONTENT AND THE PROVISION OF STEEL PRODUCTION. |
| AU640683B2 (en) * | 1990-04-09 | 1993-09-02 | Blufin S.R.L. | Method of and plant for preheating scrap iron |
| EP0592723A1 (en) * | 1992-10-13 | 1994-04-20 | Techint Compagnia Tecnica Internazionale S.P.A. | Continuous scrap preheating |
| EP0846779A1 (en) * | 1992-10-13 | 1998-06-10 | Techint Compagnia Tecnica Internazionale S.P.A. | Continuous scrap preheating |
| US6227847B1 (en) | 1998-08-06 | 2001-05-08 | Gillespie & Powers, Inc. | Apparatus and process for removing volatile coatings from scrap metal |
| WO2018218113A1 (en) * | 2017-05-26 | 2018-11-29 | Novelis Inc. | Fluid temperature control system and method for decoating kiln |
| WO2020056084A1 (en) * | 2018-09-12 | 2020-03-19 | Novelis Inc. | Cooling system and method for decoaters |
| KR20210028214A (en) | 2018-09-12 | 2021-03-11 | 노벨리스 인크. | Cooling system and method for coating removers |
| US11520360B2 (en) | 2018-09-12 | 2022-12-06 | Novelis Inc. | Cooling system and method for decoaters |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2104634B (en) | 1984-12-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930708 |