GB2054657A - Process and installation for the treatment of dust and sludge from blast furnaces, and electric furnaces and converters of steel works - Google Patents
Process and installation for the treatment of dust and sludge from blast furnaces, and electric furnaces and converters of steel works Download PDFInfo
- Publication number
- GB2054657A GB2054657A GB8017758A GB8017758A GB2054657A GB 2054657 A GB2054657 A GB 2054657A GB 8017758 A GB8017758 A GB 8017758A GB 8017758 A GB8017758 A GB 8017758A GB 2054657 A GB2054657 A GB 2054657A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bath
- dust
- process according
- slag
- container
- 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
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000000428 dust Substances 0.000 title claims abstract description 30
- 238000009434 installation Methods 0.000 title claims abstract description 14
- 239000010802 sludge Substances 0.000 title claims abstract description 14
- 238000011282 treatment Methods 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 8
- 239000010959 steel Substances 0.000 title claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000011701 zinc Substances 0.000 claims abstract description 17
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000002893 slag Substances 0.000 claims abstract description 11
- 229910052742 iron Inorganic materials 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 238000007664 blowing Methods 0.000 claims description 8
- 239000003517 fume Substances 0.000 claims description 5
- 238000005469 granulation Methods 0.000 claims description 5
- 230000003179 granulation Effects 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000007935 neutral effect Effects 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000012159 carrier gas Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 2
- 238000009628 steelmaking Methods 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 claims 2
- 239000011133 lead Substances 0.000 description 14
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 239000005864 Sulphur Substances 0.000 description 5
- 238000013019 agitation Methods 0.000 description 5
- 238000001354 calcination Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000007792 gaseous phase Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000010744 Boudouard reaction Methods 0.000 description 1
- 101100165177 Caenorhabditis elegans bath-15 gene Proteins 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 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
- 239000012071 phase Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
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
-
- 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
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
-
- 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
- C22B7/02—Working-up flue dust
-
- 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
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Abstract
This invention provides a process for the treatment of dust or sludge from a blast furnace, or from an electric furnace or converter of a steel works, to remove zinc therefrom, comprising continuously introducing the dust or sludge in a dried and crushed form into an iron bath, continuously introducing carbon- bearing material into the bath at the same time in an amount sufficient to maintain therein an amount of carbon which is greater than 1%, and adding to the bath slag-forming agent to form a slag of basic nature. A suitable installation for the purpose comprises a metallurgical container (10), a lance (23) provided with a refractory coating (26) and whose head (25) is disposed adjacent the bottom of the container and whose inlet is connected to a cell- type metering supply means (20) disposed outside of the container, and a discharge conduit (14) which extends within the container and which is connected to a dust collecting means (30). <IMAGE>
Description
SPECIFICATION
Process and installation for the treatment of dust and sludge from blast furnaces, and electric furnaces and converters of steel works
The present invention concerns a process and installation for the treatment of dust and sludge from blast furnaces, and from electric furnaces and converters of steel works.
Blast furnaces can produce up to 100 tonnes of dust and sludge for each 1000 tonnes of cast iron, depending on their mode of operation.
Considerable amounts of dust are moreover collected in the operation of purifying the gases from refining furnaces.
Depending on the quality and the composition of the ores, agglomerates or scrap materials put into the furnace, and the mode of operation of the installation, the dust and sludge may contain varying amounts of iron, zinc, lead and alkali metals which are present in the dust and sludge in the form of complex oxides.
Thus, the operator of the installation is faced with waste material which cannot be recycled directly. Indeed, direct recycling would result in concentration of the zinc, lead and alkalis within the installation, which can cause poliution of the manufactured products and considerable trouble in the course of casting operations due to the formation of harmful fumes.
It would obviously be desirable on the one hand to be abie to isolate the iron contained in the waste material in order to re-integrate it into the production processes, and on the other hand to be able to recover the zinc and lead for specific uses thereof.
Many attempts have been made in this respect and have resulted in processes of which the greater number fall into the chemical or electrochemical art.
Thus, one process developed by us and described in Luxembourg patent No. 73 039 comprises subjecting the dust to leaching with
CO2 saturated water and separating the water which contains solubilised zinc. The latter is precipitated, with removal of the CO2. This process gives excellent results as regards isolation of the zinc. However, the resulting leached solids still contain almost all the lead and a part of the alkalis, so that recycling to the charge of a blast furnace can hardly be recommended.
Other processes are based essentially on the calcination of the pelletised dust and volatilisation of the zinc, lead being very difficult to vaporise.
Thus it is known for example to use the Waelz process to treat pelletised dust together with a carbonaceous reducing agent within a rotary furnace wherein reduction of the metal oxides takes place in the solid phase, in conjunction with the Boudouard reaction, by which, in the gaseous phase, there is oxidation of the vaporised zinc.
Another process provides for calcination of the pelletised dust together with coke fines in a closed chamber, excluding oxygen, at temperatures of from 1050 to 1 500C. During this treatment, the zinc is virtually 100% volatilised and lead is approximately 15% volatilised. In order further to reduce the amounts of lead in the residue, it has been proposed that the same process may be carried out several times.
The processes which are based on the calcination of pelletised dust are very slow and do not solve the problem of the recovery of iron which is free from lead and sulphur, in a satisfactory manner. On the other hand, chemical and electrochemical processes require burdensome reagents or large amounts of electricity, and are also faced with the problems involved in removal of the liquid residues.
The process according to the invention is characterised in that the zinc is volatilised by continuously introducing the dust or sludge in a dried and crushed form into an iron bath, carbonbearing materials being continuously introduced into the bath at the same time in an amount sufficient to maintain therein an amount of carbon which is greater than 1%, and agents for forming a slag of basic nature being added to the bath; heating may be provided to compensate for the heat losses in the bath.
The idea which forms the basis of the present invention lies in replacing the known calcination treatments by a complex reaction which comprises on the one hand rapid reduction produced by the carbon which is contained in and constantly added to the iron bath, and on the other hand selective volatilisation of the reduced zinc (the reduced lead having a very high evaporation temperature), and finally melting of the reduced iron. The lead which is difficult to oxidise at the temperature of the liquid iron in the presence of small amounts of oxygen is to be found in the bottom of the bath, in metal form.
Moreover, by maintaining on the bath a layer of slag which preferably has a basicity index which is close to 1.4, it is possible to retain the sulphur which is contained in the dust and sludge being treated. This can be an advantage in comparison with the conventional processes which are based on reducing calcination, the products of which are polluted by sulphur and consequently cannot be used directly, without an additional purification step.
A first embodiment of the process according to the invention involves the material to be treated, carbon-bearing material (recarburization agent) and slag-forming agent being blown into the bath below the surface thereof. This embodiment may be performed either by means of an immersed lance and using a reducing or neutral carrier gas, or in a similar manner to any process for refining steel by the bottom blast method.
In a second embodiment, the material to be treated and the recarburization and slag-forming agents are introduced into the bath by blowing from above, in a similar manner to the LDAC process, and intense agitation is maintained in the bath by blowing gas thereinto, e.g. through a porous brick. The gas is again neutral or reducing gas.
A third embodiment involves lateral blowing by the gas, also with agitation by blowing the gas into the bath separately, e.g. through a porous brick.
In accordance with a particularly advantageous embodiment of the process according to the invention, the gas which is blown into the bath comprises the fumes from an oxygen-type converter, which are taken off during the blowing phases when they have a high proportion of carbon monoxide and a very low proportion of oxygen. These converter fumes have normally been burnt heretofore.
The function which is carried out by the gas is firstly to convey the dust and the additives into the bath and to cause therein intense agitation, and then to support rapid volatilisation towards the surface of the bath.
The zinc fumes which are given off are oxidised in accordance with Zn + CO2 < ZnO + CO in the gaseous phase and can be discharged and collected continuously, while a part of the metal bath or the liquid slag which is formed during the treatment according to the invention and which contains the sulphur can be tapped off intermittently. The case metal is generally subjected to a granulation operation, preferably granulation with water. The granules can then be integrated into a blast furnace charge. The slag which is taken off can also be granulated.
For carrying out the process, care should be taken to ensure that the iron bath which is freshly charged, and the slag-forming agents, contain only a minimum amount of silicon as zinc and lead very readily form complex compounds with silicon oxide, such complex compounds being extremely stable.
One installation for carrying out the process according to the invention comprises a metallurgical container, a lance provided with a refractory coating and whose head is disposed adjacent the bottom of the container and whose inlet is connected to a cell-type metering supply means disposed outside of the container, and a conduit which extends within the container and which is connected to a dust collecting means.
Using a cell-type metering supply means of the type described in Luxembourg patent No. 80 692 may be advantageous in the present context, insofar as it is possible to maintain a constant gas pressure within the pipe system and in the lance, the gas pressure being sufficient to impart intense agitation to the bath, and to add to the flow of gas a controllable amount of dust, recarburization agent or flux agent.
The metallurgical container may be closed by means of a removable cover through which pass the lance and heating electrodes.
While the lance can be fixed with respect to the removable cover, the electrodes can be adjustable in respect of height, insofar as the container only has heating in an intermittent mode as required.
The container may also have a casting or pouring hole for the metal, which can lead into a granulation tank, and a pouring or casting hole for discharge of the slag.
The accompanying drawing shows a diagrammatic view of one embodiment of an installation according to the invention.
The metallurgical container 10 illustrated is provided with a removable cover 11. Lance 23 and electrodes 12 pass through the cover 11.
The lance 23 which here is of the submerged type has an outside refractory coating 26. The additive materials can thus be discharged into the bottom of bath 1 5, by way of the head 25 of the lance 23. At the other end, the lance is connected to a cell-type metering supply means 20.
The blast gases, at a pressure P sufficient to ensure intense bubbling of the bath, pass through the metering supply means 20 and the lance 23, so that the speed of rotation of the shaft 22 of the means 20 only has to be adjusted to a given speed in order to inject into the bath 15 a desired amount of the dust which is in the charging funnel 21.
The required amounts of recarburization agent and slag-forming agent can be added in the same way or by means of a separate cell-type metering supply means. The recarburization and slag forming agents may be mixed beforehand.
The metal dust is treated within the bath 1 5 which is maintained in a condition of constant agitation by virtue of the blast gases.
The ZnO dust which is formed during the treatment is discharged by way of conduit 14 and collected within a cyclone separator 30 provided with a discharging means 31.
A certain amount of the bath, the volume of which increases continuously because of the amounts of iron which are recovered from the dust in the course of the treatment, is taken off intermittently through the pouring hole 1 6. The cast metal may be subjected to wate-type granulation within the tank 40 so as to be reintegrated into the charge for a blast furnace.
Alternatively, the molten metal which is free from sulphur by virtue of the presence of the basic slag in the treatment operation may be put directly into a steel-making converter. The lead is particularly easy to separate since, by virtue of its high specific weight, the metal lead accumulates at the bottom of the bath.
Claims (16)
1. A process for the treatment of dust or sludge from a blast furnace, orfrom an electric furnace or converter of a steel works, to remove zinc therefrom, comprising continuously introducing the dust or sludge in a dried and crushed form into an iron bath, continuously introducing carbonbearing material into the bath at the same time in an amount sufficient to maintain therein an amount of carbon which is greater than 1%, and adding to the bath slag-forming agent to form a slag of basic nature.
2. A process according to claim 1 including heating as necessary to compensate for the heat losses in the bath.
3. A process according to claim 1 or 2 wherein the material to be treated, carbon-bearing material and slag-forming agent are blown into the bath below the surface thereof by means of a reducing or neutral carrier gas.
4. A process according to claim 1 or 2 wherein the material to be treated, carbon-bearing material and slag-forming agent are introduced into the bath by blowing from above by means of a reducing or neutral carrier gas, whilst further such gas is blown separately into the bath to agitate the bath.
5. A process according to claim 1 or 2 wherein the material to be treated, carbon-bearing material and slag-forming agent are introduced into the bath by lateral blowing by means of a reducing or neutral carrier gas, whilst further such gas is blown separately into the bath to agitate the bath.
6. A process according to any of claim 3 to 5 wherein the gas comprises fumes from an oxygentype converter, which are taken off during the blowing phases when they have a high proportion of carbon monoxide and a very low proportion of oxygen.
7. A process according to any of claims 1 to 6 wherein dust formed in the course of the treatment is collected continuously.
8. A process according to any of claims 1 to 7 wherein a part of the metal bath and a part of the layer of slag are taken off intermittently.
9. A process according to any of claims 1 to 8 wherein metal recovered from the bath is treated by granulation and integrated into the charge for a blast furnace.
10. A process according to any of claims 1 to 8 wherein moiten metal from the bath is put untreated into a steel-making converter.
11. A process according to any of claims 1 to 10 including the step of removing molten lead from the bottom of the bath.
12. An installation for carrying out a process according to claim 1, the apparatus comprising a metallurgical container, a lance provided with a refractory coating and whose head is disposed adjacent the bottom of the container and whose inlet is connected to a cell-type metering supply means disposed outside of the container, and a discharge conduit which extends within the container and which is connected to a dust collecting means.
13. An installation according to claim 12 in which the metallurgical container has a removable cover through which pass the lance and heating electrodes.
14. An installation according to claim 11 or 12 in which the metallurgical container is provided with a tapping hole for the metal and tapping hole for the slag.
1 5. A process for the treatment of dust or sludge from a blast furnace, or from an electric furnace or converter of a steel works, to remove zinc therefrom, the process being substantially as hereinbefore described with reference to the accompanying drawing.
16. An installation for the treatment of dust or sludge from a blast furnace, or from an electric furnace or converter of a steel works, to remove zinc therefrom, the installation being substantially as hereinbefore described with reference to the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU81330A LU81330A1 (en) | 1979-05-30 | 1979-05-30 | PROCESS AND PLANT FOR THE RECOVERY OF IRON, ZINC AND LEAD CONTAINED IN DUST AND SLUDGE FROM BLAST FURNACES, AS WELL AS CONVERTERS AND ELECTRIC STEEL FURNACES |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2054657A true GB2054657A (en) | 1981-02-18 |
| GB2054657B GB2054657B (en) | 1983-03-02 |
Family
ID=19729166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8017758A Expired GB2054657B (en) | 1979-05-30 | 1980-05-30 | Process and installation for the treatment of dust and sludge from blast furnaces and electric furnaces and converters of steel works |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE883508A (en) |
| DE (1) | DE3019066A1 (en) |
| FR (1) | FR2457904A1 (en) |
| GB (1) | GB2054657B (en) |
| LU (1) | LU81330A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3536635A1 (en) * | 1985-10-15 | 1987-04-23 | Kloeckner Humboldt Deutz Ag | Process and equipment for recovering especially iron as well as zinc, lead and other non-ferrous metal constituents from oxide materials of high iron content |
| US5093103A (en) * | 1987-10-30 | 1992-03-03 | Bbc Brown Boveri Ag | Process for separating off poisonous volatile chemical compounds from a mixture of solid particles having a particle size of up to 200 microns |
| BE1009828A3 (en) * | 1995-07-13 | 1997-10-07 | Centre Rech Metallurgique | Method of recovering iron-rich iron and steel manufacturing residues |
| CN115491458A (en) * | 2021-06-19 | 2022-12-20 | 上海梅山钢铁股份有限公司 | Method for setting operating time of converter sound wave discrete descaling unit |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4701217A (en) * | 1986-11-06 | 1987-10-20 | University Of Birmingham | Smelting reduction |
| EP0299340B1 (en) * | 1987-07-15 | 1992-05-27 | BBC Brown Boveri AG | Method of removing heavy metal compounds from the filter dust from plants for the incineration of solid waste from plants for removing dust from smoke gases and from plants for gas purification |
| FI896064A (en) * | 1989-12-18 | 1991-06-19 | Outokumpu Oy | FOERFARANDE FOER FRAMSTAELLNING AV ZINK GENOM REDUCERING MED JAERNSMAELTA. |
| AT403294B (en) | 1994-10-10 | 1997-12-29 | Holderbank Financ Glarus | METHOD FOR PROCESSING WASTE OR METAL OXIDE-CONTAINING WASTE COMBUSTION RESIDUES AND DEVICE FOR CARRYING OUT THIS METHOD |
| ATE216733T1 (en) * | 1997-09-30 | 2002-05-15 | Voest Alpine Stahl Donawitz | PYROMETALLURGIC METHOD AND DEVICE FOR SEPARATING ZINC AND/OR CADMIUM AND LEAD FROM METAL WASTE MATERIALS |
| AT409266B (en) * | 2000-01-28 | 2002-07-25 | Holderbank Financ Glarus | Process for treating dusts or dust mixtures |
| RU2448180C2 (en) * | 2010-06-16 | 2012-04-20 | Государственное образовательное учреждение высшего профессионального образования Самарский государственный технический университет | Preparation method of microcrystalline aluminium-silicone alloy combination |
-
1979
- 1979-05-30 LU LU81330A patent/LU81330A1/en unknown
-
1980
- 1980-05-19 DE DE19803019066 patent/DE3019066A1/en not_active Withdrawn
- 1980-05-23 FR FR8011495A patent/FR2457904A1/en active Granted
- 1980-05-28 BE BE0/200787A patent/BE883508A/en not_active IP Right Cessation
- 1980-05-30 GB GB8017758A patent/GB2054657B/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3536635A1 (en) * | 1985-10-15 | 1987-04-23 | Kloeckner Humboldt Deutz Ag | Process and equipment for recovering especially iron as well as zinc, lead and other non-ferrous metal constituents from oxide materials of high iron content |
| US5093103A (en) * | 1987-10-30 | 1992-03-03 | Bbc Brown Boveri Ag | Process for separating off poisonous volatile chemical compounds from a mixture of solid particles having a particle size of up to 200 microns |
| BE1009828A3 (en) * | 1995-07-13 | 1997-10-07 | Centre Rech Metallurgique | Method of recovering iron-rich iron and steel manufacturing residues |
| CN115491458A (en) * | 2021-06-19 | 2022-12-20 | 上海梅山钢铁股份有限公司 | Method for setting operating time of converter sound wave discrete descaling unit |
| CN115491458B (en) * | 2021-06-19 | 2024-02-02 | 上海梅山钢铁股份有限公司 | Method for setting running time of converter acoustic discrete descaling unit |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2054657B (en) | 1983-03-02 |
| BE883508A (en) | 1980-09-15 |
| FR2457904A1 (en) | 1980-12-26 |
| LU81330A1 (en) | 1980-12-16 |
| DE3019066A1 (en) | 1980-12-11 |
| FR2457904B3 (en) | 1982-02-19 |
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