AU771045B2 - A process and apparatus for the removal of a contaminant from slag - Google Patents
A process and apparatus for the removal of a contaminant from slag Download PDFInfo
- Publication number
- AU771045B2 AU771045B2 AU10405/01A AU1040501A AU771045B2 AU 771045 B2 AU771045 B2 AU 771045B2 AU 10405/01 A AU10405/01 A AU 10405/01A AU 1040501 A AU1040501 A AU 1040501A AU 771045 B2 AU771045 B2 AU 771045B2
- Authority
- AU
- Australia
- Prior art keywords
- slag
- process fluid
- contaminant
- decontamination
- treating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- 239000002893 slag Substances 0.000 title claims description 52
- 238000000034 method Methods 0.000 title claims description 32
- 239000000356 contaminant Substances 0.000 title claims description 15
- 239000012530 fluid Substances 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 12
- 238000005202 decontamination Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 11
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 4
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L magnesium chloride Substances [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 3
- 239000001110 calcium chloride Substances 0.000 claims description 3
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 3
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 2
- 229910021529 ammonia Inorganic materials 0.000 claims description 2
- 239000012267 brine Substances 0.000 claims description 2
- 239000001569 carbon dioxide Substances 0.000 claims description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 2
- 239000001117 sulphuric acid Substances 0.000 claims description 2
- 235000011149 sulphuric acid Nutrition 0.000 claims description 2
- 239000004094 surface-active agent Substances 0.000 claims description 2
- 238000005119 centrifugation Methods 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 claims 1
- 239000011435 rock Substances 0.000 claims 1
- 238000000926 separation method Methods 0.000 claims 1
- 239000006227 byproduct Substances 0.000 description 7
- 150000002739 metals Chemical class 0.000 description 6
- 239000004568 cement Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- UHZZMRAGKVHANO-UHFFFAOYSA-M chlormequat chloride Chemical compound [Cl-].C[N+](C)(C)CCCl UHZZMRAGKVHANO-UHFFFAOYSA-M 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000011133 lead Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000002563 ionic surfactant Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011369 resultant mixture Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000003643 water by type 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
-
- 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
-
- 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
- C22B7/006—Wet processes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Description
1 A PROCESS AND APPARATUS FOR THE REMOVAL OF A CONTAMINANT FROM
SLAG
The present invention relates to a process for the removal of a contaminant. In particular, the present invention relates to a process for the removal of a contaminant from a by-product. More particularly, the present invention relates to a process for the removal of undesirable contaminants from slag produced during the smelting or refining of metals and like products. US-A-5549811 discloses a process for decontaminating soils or slags wherein ultrasonics are used for improving the leaching of metal pollutants.
During the smelting or refining of metals, a by-product molten material, commonly known as slag, is produced from the various input constituents in the furnace when it reaches 1400-1600' C.
At present, the resultant slag is subsequently removed and quenched with water to produce a granulated solid material, which is then milled and classified.
Millions of tons of slag are produced worldwide from a variety of metal production procedures, for example, iron, steel, copper etc.
°*oo ooo* Whilst the resultant separated and classified slag has application in the production of cement, the amount of slag used in the overall percentage of cement has to be carefully controlled, since high levels of slag in cement results in a slower reaction time and moreover, the high calcium and magnesium levels found within such slags can cause swelling and distortion in the reacted cements. Therefore, it will be appreciated that only a relatively low amount of the slag produced can be utilised in downstream products, with the majority of the slag going to landfill as a co-disposal mechanism.
2 In the particular case of blast furnace slag produced from steel production, the current method utilised to treat the slag for the removal of the undesirable contaminants therefrom, for example, calcium and magnesium, is to weather the slag in windrows that are periodically turned and managed for a period of up to one year.
Such treatment is necessary before being able to utilise the treated or decontaminated slag in any substantial quantity.
It will be appreciated that this current process of treating or decontaminating slag results in long periods before the treated slag can be utilised. Additionally, the current process requires high man time inputs and huge storage space requirements.
Moreover, it will be appreciated that the weathering of slag in windrows can create :••"highly undesirable run off waters as a result of the contaminants being washed from the slag over an extended period of time by rainfall, especially mildly acidic rainfall.
15 As regards the by-products from, for example, zinc, lead and copper production, same cannot be treated as with steel slag and as such can pose a severe disposal problem and environmental hazard due to the very high levels of those metals as residues trapped within the stone or slag. Furthermore, there are high levels of valuable metals, which, if released, can be reclaimed for re-use.
According to a first aspect of the present invention there is provided a S decontamination process for the removal of a contaminant from slag as claimed in claim 1.
According to the present invention there is provided a decontamination process for the treatment of slag including the steps of pre-treating the contaminated slag with a process fluid containing at least one chemical; and subjecting the mixture of contaminated slag and process fluid to ultrasound.
It is believed that a decontamination process in accordance with the present invention at least addresses the problems outlined above. In particular, the process in accordance with the present invention is able to handle the very large annual tonnage of slag produced as a by-product in the metal industry, it is energy efficient, it requires minimal man time input, it negates the contaminated run off water concerns and results in a decontaminated mineral or product that can be used in a wide range of important and value added applications, for example, in the production of acoustic panels, non-slip paints, fire retardant coatings, concrete block production etc. In addition, and in some instances, that is, depending on the constitution of the slag, the recovered or reclaimed metals can be used.
One non-limiting embodiment of an apparatus suitable for carrying out the process of the present invention will now be described by way of example and with reference to the accompanying drawing in which: Figure 1 is a schematic illustration of a plant suitable for carrying out the process of the present invention.
As illustrated, the plant includes a conveyor 10 to load the slag piles 20 into a pre-mix and treatment tank 11, which contains a chemical mixture, the choice of which is directly dependent on the intended use of the processed slag and the resultant form of the slag, such as colour. In a preferred embodiment, the chemical mixture may include any one of the following, namely, hydrochloric acid, a surfactant, preferably an ionic surfactant, sulphuric acid, brine, carbon dioxide and depending on the desired colour, may also include hydrogen peroxide, acetic acid, ammonia etc.
*o o*o• The resultant mixture of slag and desired chemicals are then transported from the pre-mix tank 11 to a series of ultrasonic processors 13.
Preferably, such transportation is effected by the patented Tore system which is able to move very high-density materials, such as slag, with very high solid loadings, with high efficiency and low energy inputs.
Once within the tubular ultrasonic processors 13, the mixture of slag and chemicals are subjected to a sonochemical reaction that results in the rapid dissolving and removal of the contaminant on the slag from both external and internal surfaces of the slag or base material. In this connection, the action of the ultrasound processors 13 forces the chemicals into the inner pore structure of the by-product materials, thereby enabling a deep decontamination to take place. An ultrasonic processor suitable for this application is disclosed in our European Patent Application No 96922160.5.
The slag, which is now decontaminated, and the contaminant containing process chemicals or fluid is then passed over a dewatering screen 14, for example, a three deck separator sieve, whereby the now separate cleaned solids materials can be considered as ready for immediate use or may be size classified and dried depending on the chosen end use, for example, cement production, railway clinker, wall block production etc.
The process chemicals, which result from the sonochemical process, after sieving, can then be recycled back into the pre-mix vessel 11 and the necessary chemical levels, for example, pH or alkalinity, can be monitored and maintained as required. In this connection, as the concentration of the removed contaminants increases to the point of :•20 precipitation, then the recycled fluids can be centrifuged to recover, for example, S.calcium chloride and magnesium chloride, which subsequent to being dried can be sold back into the chemical industry for use.
In the case of the requirement for metal recovery from refining slags for either commercial or environmental reasons, a further step utilising an electro-chemical process is required whereby levels of, for example, zinc, lead, nickel, chromium etc.
have been removed up to a minimum of 99.5%.
o.oeei It is to be understood that the process and process plant of the present invention 0 can be utilised to treat or decontaminate any type of slag or like product produced as a by-product during the smelting or refining or production of metals. In particular, it is to be understood that the process and apparatus in accordance with the present invention can be used to decontaminate any by-product of any metal production process.
It will be understood that the term "comprise" and any of its derivatives (eg.
comprises, comprising) as used in this specification is to be taken to be inclusive of features to which it refers, and is not meant to exclude the presence of any additional features unless otherwise stated or implied.
oOo *o*oo *~o *o *oo
Claims (8)
1. A process for treating slag from metal production in order to remove contaminant from said slag and to produce a reusable slag, including the steps of: mixing the contaminated slag with a process fluid selected for the intended use of the processed slag in a first tank into which the contaminated slag and process fluid are added, the process fluid containing at least one chemical; transporting the mixture of contaminated slag and process fluid through at least one ultrasonic processor whereby the mixture of slag and process fluid are subjected to a sonochemical reaction that results in the rapid dissolving and removal of the contaminant from both the external and internal surfaces of the slag; and separating the decontaminated slag from the process fluid.
2. A decontamination process of claim 1, wherein separation of the decontaminated slag from the process fluid is effected via the use of a dewatering screen.
3. A decontamination process of claim 1 or 2 wherein the process fluid includes at least one chemical selected from the group consisting of hydrochloric acid, a 20 surfactant, sulphuric acid, brine, carbon dioxide, hydrogen peroxide, acetic acid and ,9"9 ammonia.
4. A decontamination process of any one of the preceding claims, further SI including the step of monitoring the pH of the process fluid.
A decontamination process of any one of the preceding claims, further including the step of treating the process fluids by centrifugation to recover the contaminant. ooo 30
6. A decontamination process of claim 5, wherein the contaminant recovered is magnesium or calcium chloride. magnesium or calcium chloride.
7. A decontamination process of any one of the preceding claims, further including the step of treating the slag electro-chemically.
8. A decontamination process substantially in accordance with any one of the embodiments of the invention described herein and illustrated in the accompanying drawings. Dated this 19 th day of January, 2004. Nu-Rock (Sonics) Limited By its Patent Attorneys MADDERNS S *0 *S* o
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9925018A GB9925018D0 (en) | 1999-10-23 | 1999-10-23 | A process for the removal of a contaminant |
| GB9925018 | 1999-10-23 | ||
| PCT/GB2000/004096 WO2001031073A1 (en) | 1999-10-23 | 2000-10-23 | A process and apparatus for the removal of a contaminant from slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU1040501A AU1040501A (en) | 2001-05-08 |
| AU771045B2 true AU771045B2 (en) | 2004-03-11 |
Family
ID=10863192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU10405/01A Ceased AU771045B2 (en) | 1999-10-23 | 2000-10-23 | A process and apparatus for the removal of a contaminant from slag |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP1224338A1 (en) |
| JP (1) | JP2003512533A (en) |
| KR (1) | KR20020047254A (en) |
| CN (1) | CN1382225A (en) |
| AU (1) | AU771045B2 (en) |
| CA (1) | CA2388458A1 (en) |
| GB (1) | GB9925018D0 (en) |
| WO (1) | WO2001031073A1 (en) |
| ZA (1) | ZA200203158B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2308494C1 (en) * | 2006-01-27 | 2007-10-20 | Вячеслав Павлович Терехин | Method for extraction of non-ferrous and precious metals |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2245379C1 (en) * | 2003-05-22 | 2005-01-27 | Федеральное государственное унитарное предприятие "Центральный научно-исследовательский геологоразведочный институт цветных и благородных металлов" (ФГУП "ЦНИГРИ") | Method of intensification of gold leaching-out process |
| FI122348B (en) * | 2008-05-30 | 2011-12-15 | Rautaruukki Oyj | Process for the production of calcium carbonate from waste and by-products |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5549811A (en) * | 1992-05-29 | 1996-08-27 | Unimetal Societe Francaise Des Aciers Longs | Process for decontamination soils polluted with metals |
| DE19708411A1 (en) * | 1997-03-03 | 1998-09-17 | Muesing Anton Gmbh Co Kg | Method and device for processing material |
| DE19723607A1 (en) * | 1997-06-05 | 1998-12-10 | Wolfgang Dr Ing Schuldes | Decontamination of soils, slurries, etc. with almost complete breakdown of contaminants |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5848489B2 (en) * | 1977-04-09 | 1983-10-28 | 光和精鉱株式会社 | How to deal with "Karami" |
| JPS59133304A (en) * | 1983-01-19 | 1984-07-31 | Nippon Steel Corp | Method for accelerating aging of slag cooled slowly in blast furnace |
-
1999
- 1999-10-23 GB GB9925018A patent/GB9925018D0/en not_active Ceased
-
2000
- 2000-10-23 JP JP2001533206A patent/JP2003512533A/en active Pending
- 2000-10-23 EP EP20000971566 patent/EP1224338A1/en not_active Withdrawn
- 2000-10-23 CN CN00814744A patent/CN1382225A/en active Pending
- 2000-10-23 AU AU10405/01A patent/AU771045B2/en not_active Ceased
- 2000-10-23 KR KR1020027005041A patent/KR20020047254A/en not_active Withdrawn
- 2000-10-23 WO PCT/GB2000/004096 patent/WO2001031073A1/en not_active Ceased
- 2000-10-23 CA CA 2388458 patent/CA2388458A1/en not_active Abandoned
-
2002
- 2002-04-22 ZA ZA200203158A patent/ZA200203158B/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5549811A (en) * | 1992-05-29 | 1996-08-27 | Unimetal Societe Francaise Des Aciers Longs | Process for decontamination soils polluted with metals |
| DE19708411A1 (en) * | 1997-03-03 | 1998-09-17 | Muesing Anton Gmbh Co Kg | Method and device for processing material |
| DE19723607A1 (en) * | 1997-06-05 | 1998-12-10 | Wolfgang Dr Ing Schuldes | Decontamination of soils, slurries, etc. with almost complete breakdown of contaminants |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2308494C1 (en) * | 2006-01-27 | 2007-10-20 | Вячеслав Павлович Терехин | Method for extraction of non-ferrous and precious metals |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2001031073A1 (en) | 2001-05-03 |
| CN1382225A (en) | 2002-11-27 |
| EP1224338A1 (en) | 2002-07-24 |
| JP2003512533A (en) | 2003-04-02 |
| GB9925018D0 (en) | 1999-12-22 |
| ZA200203158B (en) | 2003-08-27 |
| CA2388458A1 (en) | 2001-05-03 |
| AU1040501A (en) | 2001-05-08 |
| KR20020047254A (en) | 2002-06-21 |
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