CN110791662A - Method for preparing high-purity copper ingot by using oil-containing scrap copper - Google Patents
Method for preparing high-purity copper ingot by using oil-containing scrap copper Download PDFInfo
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- CN110791662A CN110791662A CN201810866652.1A CN201810866652A CN110791662A CN 110791662 A CN110791662 A CN 110791662A CN 201810866652 A CN201810866652 A CN 201810866652A CN 110791662 A CN110791662 A CN 110791662A
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- copper
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- 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
- C22B15/00—Obtaining copper
- C22B15/0026—Pyrometallurgy
- C22B15/0056—Scrap treating
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- 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
- C22B7/001—Dry processes
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- 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
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- 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
Abstract
The invention relates to a method for preparing a high-purity copper ingot by utilizing oil-containing scrap copper, which comprises the following steps: firstly, carrying out low-pressure pyrolysis deoiling on oil-containing scrap copper, then carrying out ball milling treatment on the deoiled scrap copper, and screening to obtain pure scrap copper; and melting the pure scrap copper, injecting copper water into a fixed die, and cooling to prepare the high-purity copper ingot. The waste flue gas generated in the low-pressure pyrolysis deoiling process is absorbed and recovered, and the flue gas generated in the melting process is directly absorbed and recovered by a low-pressure pyrolysis deoiling waste gas absorption system after being cooled. The method realizes the high-efficiency recycling of the copper resource in the scrap copper resource, and realizes the high purification of the flue gas generated in the processes of low-pressure pyrolysis and melting through adsorption. The method belongs to environment-friendly clean utilization of scrap copper and has wide market prospect.
Description
Technical Field
The invention relates to the field of metal resource recycling and solid waste resource recycling, in particular to a method for recycling oil-containing scrap copper in copper resource recycling, and particularly relates to a method for preparing high-purity copper ingots by using the oil-containing scrap copper.
Background
Copper-based oily waste residues are solid wastes generated in the copper material processing process, particularly copper scraps generated in the copper cutting process, wherein the copper scraps contain a large amount of copper resources and are doped with impurities such as cutting oil, sand and stone. While the application of the metal copper in the industries of electric power, machinery, electronics, electrical appliances, weapons and the like is very wide, but China is always a country with shortage of copper resources, copper mine resources are poor, the exploitation difficulty is high, newly discovered resources are few, and the reserve reserves are insufficient. Copper regeneration is an important way for making up for the shortage of copper resources in China. Therefore, the method for recovering copper from copper-based oil-containing waste residues completely conforms to the national development strategy and has important practical significance.
At present, the research on recovering copper from copper-based oily waste residues is less, and most of the research is to extract copper from copper ores by flotation or recover copper from waste enameled wires. The direct discharge of copper-based oily waste residues can cause serious environmental pollution and also can cause serious loss of copper resources.
The invention provides a method for preparing a high-purity copper ingot by using oily scrap copper, aiming at solving the problems of recycling of copper-based oily waste residues and environmental pollution. And recovering copper by adopting low-temperature pyrolysis, ball milling and high-temperature melting to prepare the high-purity copper ingot.
Disclosure of Invention
The invention aims to provide a method for preparing a high-purity copper ingot by utilizing oil-containing scrap copper, which realizes copper resource regeneration and preparation of the high-purity copper ingot. The method solves the pollution problem of copper-based oily waste residues, realizes copper resource recovery, effectively treats flue gas in the treatment process, belongs to a clean production process, and does not produce secondary pollution.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for preparing high-purity copper ingots by utilizing oil-containing scrap copper comprises the following steps:
(1) carrying out low-pressure pyrolysis treatment on the oily scrap copper in a pyrolysis furnace, and directly introducing the waste gas into an adsorption tower for tail gas treatment;
(2) ball-milling the oily scrap copper treated in the step (1) in a ball mill, and then screening to remove breakable impurities in the scrap copper;
(3) melting the scrap copper with low impurities treated in the step (2) in a power frequency furnace, injecting copper water into a specific mould, and cooling to prepare a high-purity copper ingot;
(4) continuously slagging off in the melting process in the step (3), and collecting high-melting-point slag to realize further purification of scrap copper;
(5) collecting the flue gas generated by melting in the step (3), cooling and recovering the low-melting-point rare metal, and adsorbing and purifying the flue gas by an adsorption tower.
According to the invention, the low-pressure pyrolysis is carried out on the oily scrap copper in the early stage, and 90% of oil in the oily scrap copper is removed, so that the treated scrap copper can be directly melted in a power frequency furnace, and the oil-free scrap copper does not need to be mixed and melted, thereby avoiding disasters caused by fire in the melting process; the ball milling and screening can further remove the brittle impurities such as sand and stone in the oily scrap copper and improve the purity of the oily scrap copper; the flue gas is directly/cooled after low-pressure pyrolysis and scrap copper melting and then is introduced into the absorption tower to realize the purification of the flue gas, thereby avoiding the environmental pollution.
Preferably, the low-pressure pyrolysis conditions in step (1) are a pressure of 0.05 to 0.1MPa, such as 0.05MPa, 0.06MPa, 0.07MPa, 0.08MPa, 0.09MPa or 0.1 MPa; the pyrolysis time is 1-3 h, such as 1h, 1.2h, 1.5h, 1.8h, 2h, 2.5h, 2.8h or 3h, and the pyrolysis temperature is 50-300 ℃, such as 50 ℃, 80 ℃, 100 ℃, 120 ℃, 150 ℃, 200 ℃, 220 ℃, 250 ℃ or 300 ℃; the pyrolysis atmosphere is a reducing atmosphere.
Preferably, the adsorption tower in the step (1) and the adsorption tower in the step (5) use activated carbon or other adsorbents with larger analog surface area.
Preferably, the ball milling treatment condition in the step (2) is 10-60 min, such as 10min, 20min, 30min, 40min, 50min or 60 min.
Preferably, the temperature of the melting process in the step (3) is 800-1000 ℃, such as 800 ℃, 850 ℃, 900 ℃ or 1000 ℃.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention realizes the high-efficiency recycling of copper resources in scrap copper resources, and ensures that the copper content in the prepared high-purity copper ingot reaches more than 96 percent; meanwhile, flue gas generated in the low-pressure pyrolysis and melting processes is adsorbed to realize high purification, so that the method belongs to an environment-friendly clean scrap copper utilization method.
Drawings
FIG. 1 is a process flow chart for preparing high-purity copper ingots by using oil-containing scrap copper.
The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
FIG. 1 shows a flow chart of the process for preparing high-purity copper ingots by using scrap copper containing oil according to the present invention, and the following examples are all operated according to the flow chart.
Example 1:
carrying out low-pressure pyrolysis on the oily scrap copper in a pyrolysis furnace, wherein the heating temperature is 50 ℃, the pyrolysis pressure is 0.05MPa and the heating time is 1h under the nitrogen protection atmosphere; ball-milling the oil-free scrap copper subjected to pyrolysis in a ball mill for 10min, and then screening to obtain pure scrap copper; melting pure scrap copper in a power frequency furnace at 800 ℃, and then carrying out continuous casting to prepare a high-purity copper ingot. The copper content in the prepared high-purity copper ingot is 97%.
Continuously skimming in the melting process, and collecting high-melting-point slag to further purify the scrap copper; meanwhile, the flue gas generated by melting is collected, the low-melting-point rare metal is recovered by cooling, and the flue gas is adsorbed and purified.
Example 2:
carrying out low-pressure pyrolysis on the oily scrap copper in a pyrolysis furnace, wherein the heating temperature is 300 ℃, the pyrolysis pressure is 0.1MPa, and the heating time is 3h under the nitrogen protection atmosphere; ball-milling the oil-free scrap copper subjected to pyrolysis in a ball mill for 50min, and then screening to obtain pure scrap copper; melting pure scrap copper in a power frequency furnace at 900 ℃, and then carrying out continuous casting to prepare a high-purity copper ingot. The copper content in the prepared high-purity copper ingot is 98 percent.
Continuously skimming in the melting process, and collecting high-melting-point slag to further purify the scrap copper; meanwhile, the flue gas generated by melting is collected, the low-melting-point rare metal is recovered by cooling, and the flue gas is adsorbed and purified.
Example 3:
carrying out low-pressure pyrolysis on the oily scrap copper in a pyrolysis furnace, wherein the heating temperature is 100 ℃, the pyrolysis pressure is 0.06MPa, and the heating time is 2h under the nitrogen protection atmosphere; ball-milling the oil-free scrap copper subjected to pyrolysis in a ball mill for 30min, and then screening to obtain pure scrap copper; melting the pure scrap copper in a power frequency furnace at 990 ℃, and then carrying out continuous casting to prepare the high-purity copper ingot. The copper content in the prepared high-purity copper ingot is 99%.
Continuously skimming in the melting process, and collecting high-melting-point slag to further purify the scrap copper; meanwhile, the flue gas generated by melting is collected, the low-melting-point rare metal is recovered by cooling, and the flue gas is adsorbed and purified.
Example 4:
carrying out low-pressure pyrolysis on the oily scrap copper in a pyrolysis furnace, wherein the heating temperature is 200 ℃, the pyrolysis pressure is 0.07MPa and the heating time is 2.5h under the protection of nitrogen; ball-milling the oil-free scrap copper subjected to pyrolysis in a ball mill for 60min, and then screening to obtain pure scrap copper; melting pure scrap copper in a power frequency furnace at 1000 ℃, and then carrying out continuous casting to prepare a high-purity copper ingot. The copper content in the prepared high-purity copper ingot is 98.5 percent.
Continuously skimming in the melting process, and collecting high-melting-point slag to further purify the scrap copper; meanwhile, the flue gas generated by melting is collected, the low-melting-point rare metal is recovered by cooling, and the flue gas is adsorbed and purified.
Example 5:
carrying out low-pressure pyrolysis on the oily scrap copper in a pyrolysis furnace, wherein the heating temperature is 250 ℃, the pyrolysis pressure is 0.1MPa, and the heating time is 3h under the nitrogen protection atmosphere; ball-milling the oil-free scrap copper subjected to pyrolysis in a ball mill for 40min, and then screening to obtain pure scrap copper; melting pure scrap copper in a power frequency furnace at 850 ℃, and then carrying out continuous casting to prepare a high-purity copper ingot. The copper content in the prepared high-purity copper ingot is 96 percent.
Continuously skimming in the melting process, and collecting high-melting-point slag to further purify the scrap copper; meanwhile, the flue gas generated by melting is collected, the low-melting-point rare metal is recovered by cooling, and the flue gas is adsorbed and purified.
The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (5)
1. A method for preparing high-purity copper ingots by using oil-containing scrap copper is characterized by comprising the following steps:
(1) carrying out low-pressure pyrolysis treatment on the oily scrap copper in a pyrolysis furnace, and directly introducing the waste gas into an adsorption tower for tail gas treatment;
(2) ball-milling the oily scrap copper treated in the step (1) in a ball mill, and then screening to remove breakable impurities in the scrap copper;
(3) melting the scrap copper with low impurities treated in the step (2) in a power frequency furnace, injecting copper water into a specific mould, and cooling to prepare a high-purity copper ingot;
(4) continuously slagging off in the melting process in the step (3), and collecting high-melting-point slag to realize further purification of scrap copper;
(5) collecting the flue gas generated by melting in the step (3), cooling and recovering the low-melting-point rare metal, and adsorbing and purifying the flue gas by an adsorption tower.
2. The method for preparing the high-purity copper ingot by using the oil-containing scrap copper according to claim 1, wherein the oil-containing scrap copper is pyrolyzed at low pressure under the conditions of 0.05-0.1 MPa of pressure, 1-3 h of pyrolysis time, 50-300 ℃ of pyrolysis temperature and reducing atmosphere.
3. The method for preparing the high-purity copper ingot by using the oil-containing scrap copper according to claim 1, wherein the adsorption tower in the steps (1) and (5) uses activated carbon or other adsorbents with larger analog surface areas as adsorbing materials.
4. The method for preparing the high-purity copper ingot by using the oil-containing scrap copper according to claim 1, wherein the ball milling treatment condition in the step (2) is that the ball milling time is 10-60 min.
5. The method for preparing the high-purity copper ingot by using the oil-containing scrap copper according to claim 1, wherein the melting process in the step (3) is performed at a temperature of 800-1000 ℃.
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| CN201810866652.1A CN110791662A (en) | 2018-08-01 | 2018-08-01 | Method for preparing high-purity copper ingot by using oil-containing scrap copper |
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| CN201810866652.1A CN110791662A (en) | 2018-08-01 | 2018-08-01 | Method for preparing high-purity copper ingot by using oil-containing scrap copper |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100012621A1 (en) * | 2006-08-25 | 2010-01-21 | Abb Research Ltd. | Method of treating copper sulphide deposits in an electrical apparatus by the use of oxidising agents |
| TW201041668A (en) * | 2009-05-27 | 2010-12-01 | xie-sen Wu | Pyrolysis method of recycled substrate of printed circuit board and device thereof |
| CN105039738A (en) * | 2015-07-27 | 2015-11-11 | 王泊远 | Crude copper fire refining furnace and process |
| CN106086445A (en) * | 2016-08-10 | 2016-11-09 | 安徽晋源铜业有限公司 | A kind of cleaning molten method of oxygen-free copper bar |
| CN106498190A (en) * | 2016-11-02 | 2017-03-15 | 江西理工大学 | The method of neodymium iron boron greasy filth waste material in-situ carbon thermocatalytic chlorination recovering rare earth product |
| CN107354299A (en) * | 2017-05-23 | 2017-11-17 | 西北矿冶研究院 | Method for recycling Cu, Pb, Zn and Fe in slag in metal smelting process |
-
2018
- 2018-08-01 CN CN201810866652.1A patent/CN110791662A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100012621A1 (en) * | 2006-08-25 | 2010-01-21 | Abb Research Ltd. | Method of treating copper sulphide deposits in an electrical apparatus by the use of oxidising agents |
| TW201041668A (en) * | 2009-05-27 | 2010-12-01 | xie-sen Wu | Pyrolysis method of recycled substrate of printed circuit board and device thereof |
| CN105039738A (en) * | 2015-07-27 | 2015-11-11 | 王泊远 | Crude copper fire refining furnace and process |
| CN106086445A (en) * | 2016-08-10 | 2016-11-09 | 安徽晋源铜业有限公司 | A kind of cleaning molten method of oxygen-free copper bar |
| CN106498190A (en) * | 2016-11-02 | 2017-03-15 | 江西理工大学 | The method of neodymium iron boron greasy filth waste material in-situ carbon thermocatalytic chlorination recovering rare earth product |
| CN107354299A (en) * | 2017-05-23 | 2017-11-17 | 西北矿冶研究院 | Method for recycling Cu, Pb, Zn and Fe in slag in metal smelting process |
Non-Patent Citations (2)
| Title |
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| 大冶有色金属公司: "《反射炉炼铜》", 30 June 1980, 冶金工业出版社 * |
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