WO2002053789A1 - Procedimiento de eliminacion y recuperacion del cinc contenido en chatarra galvanizada compactada, asi como instalacion correspondiente - Google Patents
Procedimiento de eliminacion y recuperacion del cinc contenido en chatarra galvanizada compactada, asi como instalacion correspondiente Download PDFInfo
- Publication number
- WO2002053789A1 WO2002053789A1 PCT/ES2000/000500 ES0000500W WO02053789A1 WO 2002053789 A1 WO2002053789 A1 WO 2002053789A1 ES 0000500 W ES0000500 W ES 0000500W WO 02053789 A1 WO02053789 A1 WO 02053789A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- scrap
- zinc
- compacted
- heating
- galvanized
- Prior art date
Links
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
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/003—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals by induction
-
- 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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/04—Obtaining zinc by distilling
-
- 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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Definitions
- the present invention relates to a process designed to remove zinc contained in compacted galvanized scrap, which is usually provided as raw material for melting in foundries and steelworks. It is also the object of the invention to recover the zinc removed from said scrap, for later commercialization in a pure and solid state.
- the process is based on producing, by induction heating, the evaporation of zinc, this evaporation being assisted by vacuum, to subsequently subject the vapors to a condensation process to achieve the solidification of the zinc.
- the corresponding installation for the implementation of the process is also an object of the invention, an installation comprising an induction furnace in which the heating of the scrap takes place, and a condenser accessed by the evaporated zinc, for the condensation of East.
- the installation also includes a pump for extracting the vapors produced, for its passage to the condenser, as well as means for applying the vacuum during the evaporation process.
- the zinc contained in the fusion charges appears as a highly toxic component (zinc oxide powder) in the process fumes, which in the case of steel mills represents, with 24% by weight, the second major component (after iron) of the dust that is collected by filtering the fumes.
- the zinc contained in the scrap constitutes an impurity in the melting broth, which causes a deterioration of the mechanical properties of the castings obtained.
- the Belgian Patent BE 1005294 describes a procedure for the elimination of zinc, which is based on the fact that the heating of the scrap is carried out at a temperature equal to or greater than that of vaporization of the zinc, the heating being carried out by electric induction at high frequency
- This process does not describe the type of oven used, nor does it specify the way to condense the vapors, nor does it comment on the type of scrap (provenance, compacted or not, etc.).
- the heating is carried out in a neutral (nitrogen) or slightly reducing atmosphere, because the burning of scrap oils and fats also occurs.
- Japanese patent JP 6287657 A2 a method based on a vacuum treatment is described, although in this case there is no reference to any type of heating or concrete furnace, a patent that is based on mere theoretical foundations of zinc separation and the steel, unlike the vaporization point, not commenting whether the scrap is compacted or not, although there is reference to the scrap coming from cuts in the automobile industry and used as raw material for foundry.
- This Japanese patent describes a way to remove oil, water, dust, etc., based on heating in an atmospheric environment between 400-450 ° C, followed by a vacuum heating at 500-900 ° C, and then solidify zinc vapors in the same degree of vacuum, or at a temperature below 400 ° C, referring the patent to a "vacuum sublimation".
- the aforementioned atmosphere says that it is achieved by introducing solid carbon or liquid or gaseous hydrocarbons into the furnace, solid carbon being formed by the introduction of an oxidizing gas, producing the environment with the desired C0 2 / CO ratio, referring to the oven is rotating with external heating but without specifying what type.
- an oxidizing gas producing the environment with the desired C0 2 / CO ratio, referring to the oven is rotating with external heating but without specifying what type.
- any case in this Japanese Patent it is not clear that a recovery of zinc occurs, since it seems that said zinc is dispersed in the combustion gas produced in the oven, gas that is evacuated from the oven continuously, speaking after a treatment system of said exhaust gas and bag filters, it may be that zinc is in the form of dust immersed in the exhaust gas, said powder being collected in bag filters, not referring to any Zinc condensation moment.
- the procedure that is recommended is designed to remove the zinc contained in compacted galvanized scrap, as well as to recover that zinc in its purest form for later commercial use, the procedure being carried out prior to the melting of the scrap.
- the procedure in question consists of heating by induction and in vacuum the scrap, until a temperature always below the normal temperature of vaporization of zinc (906 ° C) maintaining said temperature until the total elimination of zinc, since the heating produces an evaporation selective zinc against steel, with the particularity that the Vacuum application allows to substantially reduce the temperature necessary for the evaporation of zinc itself, according to the vapor tension curve of said substance, while the vacuum prevents the oxidation of zinc, which makes it difficult to evaporate it when ZnO is formed .
- an installation comprising an induction furnace in which a vacuum chamber is established in which the heating process takes place, the vacuum being carried out by means of a pump, as well as a tower of Condensation of zinc, which is accessed by the vapors by extracting them, from the furnace itself, a condensation tower that is cooled by water, and there is the possibility of recirculating the vapors by means of a sealed construction fan.
- the installation is complemented by a force and control cabinet, in which the corresponding devices and controls for the operation and control of the installation are located.
- Figure 1 shows the schematic representation of the installation, with an induction furnace that allows the treatment of compacted galvanized scrap, that induction furnace being associated with a control cabinet and a zinc condensation tower, connected to A vacuum pump
- Figure 2. It shows a sectional view corresponding to the zinc condensation tower, with the corresponding vapor intake, cooling water and its outlet.
- Figure 3. Shows the vapor tension curve of zinc.
- the process of the invention is intended to remove the zinc contained in compacted galvanized scrap, based on a preheating in vacuum of said scrap prior to incorporation into the melting process, producing by such heating a selective evaporation of zinc against steel, at a temperature lower than the evaporation temperature of zinc at atmospheric pressure
- compacted scrap Prior to the phase of selective evaporation of zinc, compacted scrap is introduced into the induction furnace, where it is subjected to a low pretreatment temperature (around 100 ° C) in the presence of vacuum (approximately 5 mbar) for the previous elimination of moisture and the oils that impregnate the scrap.
- a low pretreatment temperature around 100 ° C
- vacuum approximately 5 mbar
- the actual phase of zinc removal is initiated, in which, as indicated above, the compacted scrap is heated in the induction furnace to a temperature below the vaporization temperature of zinc.
- a vacuum that, optionally, depending on the chosen working temperature, which will remain constant throughout the zinc evaporation process, will be between 2 and 5 mbar.
- Figure 3 shows the vapor tension curve of zinc, in which it is observed that at a pressure of 5 mbar the temperature necessary to evaporate the zinc is reduced from 906 ° C to 550 ° C.
- the installation for the implementation of said procedure comprises an induction furnace (1) in which the heating of the compacted galvanized scrap (2), duly located on a support (3) will take place.
- furnace (1) there will be an inductor coil (4) constituted in a special electrolytic copper profile, also including a set of magnetic cores (5) for shielding the inductor field.
- induction furnace (1) heating, at a temperature below in any case at 906 ° C, and under vacuum, produces the evaporation of zinc, all in such a way that through a conduit (6) the vapors of zinc are passed to a condensation tower (7) to which a vacuum pump (8) is associated, so that in the condensation tower solidification of the zinc, which is collected through an outlet (8), the vapors (9) escaping outside.
- Figure 2 shows that condensation tower (7), with the inlet (10) of the zinc vapors from the induction furnace (1), with water cooling being carried out through the chambers (11) and ( 12) equipped with their corresponding inputs (11'- 12 ') and their corresponding outputs (11' '-12' '), respectively.
- the aforementioned installation can be complemented with a means of extraction / recirculation of vapors, based on a fan of waterproof construction, complemented by bypass cut-off valves and measuring elements, while the vacuum application is carried out through the vacuum pump (8) already referred to as simple effect, associated with a sensor that measures the degree of vacuum.
- the scrap goes into the preheated fusion process, which implies an energy saving, while producing other positive consequences in the whole of the fusion process, such as the decrease in the deterioration of the electrodes in the case of that the fusion is carried out in an electric arc furnace.
- the test load consisted of a package of compacted galvanized scrap coming from cuttings of embossing sheet of the automobile industry, oscillating the thicknesses of galvanized between 8-12 microns, while the dimension of the package was 400 x 300 x 300 mm with a weight between 90-120 Kg.
- the zinc content of this package is approximately 1.5 Kg., although it may be slightly higher or lower, the galvanization not being perfectly homogeneous.
- the package was introduced into the oven, by means of an electric hoist, followed by a vacuum pretreatment (approximately 5 mbar) and at a low temperature (around 100 ° C) for the previous elimination of moisture and oils that permeate the Scrap.
- a vacuum heating (between 2 and 5 mbar) has been carried out up to about 500 ° C, maintaining that temperature until the zinc is completely removed from the galvanized, so that the vapors produced were extracted by the vacuum pump and passed to the condensation tower, so that on contact with the cold wall (water-cooled) the zinc was deposited in solid form, with great purity, finally removing the scrap once cooled, while the condensed zinc was followed picking up every certain time, in order to avoid decreasing the efficiency of the condensation tower.
- the performance was evaluated based on the difference in the weight of the scrap metal before and after the test, and the loss was almost entirely separated zinc.
- the galvanizing thickness of the sheet was also measured before and after the test.
- the richness, or percentage of zinc, in the collected condensate was determined, based on two methods, one determining the percentage of zinc in an ICP equipment of atomic emission spectrometry by induction-coupled plasma, which turns out to be a method of maximum precision, and another based on a chemical analysis by volumetric titration, so that the aforementioned averages were the following:
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/ES2000/000500 WO2002053789A1 (es) | 2000-12-29 | 2000-12-29 | Procedimiento de eliminacion y recuperacion del cinc contenido en chatarra galvanizada compactada, asi como instalacion correspondiente |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/ES2000/000500 WO2002053789A1 (es) | 2000-12-29 | 2000-12-29 | Procedimiento de eliminacion y recuperacion del cinc contenido en chatarra galvanizada compactada, asi como instalacion correspondiente |
Publications (1)
Publication Number | Publication Date |
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WO2002053789A1 true WO2002053789A1 (es) | 2002-07-11 |
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PCT/ES2000/000500 WO2002053789A1 (es) | 2000-12-29 | 2000-12-29 | Procedimiento de eliminacion y recuperacion del cinc contenido en chatarra galvanizada compactada, asi como instalacion correspondiente |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100372953C (zh) * | 2006-07-12 | 2008-03-05 | 江苏法尔胜技术开发中心 | 镀锌钢丝拉拔脱落锌的再生方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1284657A (en) * | 1970-03-23 | 1972-08-09 | Imp Smelting Corp Ltd | Improvements in or relating to the separation of zinc and cadmium |
EP0493122A2 (en) * | 1990-12-27 | 1992-07-01 | Ogihara Technical Center Co Ltd | Method and apparatus for recovering substance adhered to object to be processed |
EP0745692A1 (en) * | 1995-05-31 | 1996-12-04 | Toyota Jidosha Kabushiki Kaisha | Method and apparatus of treating dusts containing oxides |
EP0821071A1 (en) * | 1996-07-17 | 1998-01-28 | Aichi Steel Works, Ltd. | Vacuum treatment of dust exhausted from iron and steel melting furnace for recovery of lead and zinc |
JPH10287933A (ja) * | 1997-04-16 | 1998-10-27 | Chugai Ro Co Ltd | 亜鉛含有ダストの処理方法及びその設備 |
-
2000
- 2000-12-29 WO PCT/ES2000/000500 patent/WO2002053789A1/es not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1284657A (en) * | 1970-03-23 | 1972-08-09 | Imp Smelting Corp Ltd | Improvements in or relating to the separation of zinc and cadmium |
EP0493122A2 (en) * | 1990-12-27 | 1992-07-01 | Ogihara Technical Center Co Ltd | Method and apparatus for recovering substance adhered to object to be processed |
EP0745692A1 (en) * | 1995-05-31 | 1996-12-04 | Toyota Jidosha Kabushiki Kaisha | Method and apparatus of treating dusts containing oxides |
EP0821071A1 (en) * | 1996-07-17 | 1998-01-28 | Aichi Steel Works, Ltd. | Vacuum treatment of dust exhausted from iron and steel melting furnace for recovery of lead and zinc |
JPH10287933A (ja) * | 1997-04-16 | 1998-10-27 | Chugai Ro Co Ltd | 亜鉛含有ダストの処理方法及びその設備 |
Non-Patent Citations (1)
Title |
---|
DATABASE WPI Derwent World Patents Index; AN 1999-018586 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100372953C (zh) * | 2006-07-12 | 2008-03-05 | 江苏法尔胜技术开发中心 | 镀锌钢丝拉拔脱落锌的再生方法 |
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