CN111020192B - Method for purifying and recycling AgCd alloy from AgCd waste - Google Patents
Method for purifying and recycling AgCd alloy from AgCd waste Download PDFInfo
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- CN111020192B CN111020192B CN201911046912.1A CN201911046912A CN111020192B CN 111020192 B CN111020192 B CN 111020192B CN 201911046912 A CN201911046912 A CN 201911046912A CN 111020192 B CN111020192 B CN 111020192B
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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
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/02—Refining by liquating, filtering, centrifuging, distilling, or supersonic wave action including acoustic waves
- C22B9/023—By filtering
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
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- 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
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Abstract
The invention discloses a method for purifying and recycling AgCd alloy from AgCd waste. Placing the foamed ceramic sheet with the same area at the bottom of a smelting furnace, then placing AgCd waste material, and carrying out high-temperature smelting treatment; after refining is finished, taking out the foamed ceramic wafer floating on the surface of the melt to obtain high-purity AgCd alloy; the AgCdO material is prepared by taking AgCd alloy as a raw material. The electric contact material prepared by adopting the high-purity AgCd alloy feeding has high purity of raw materials, low impurity content, good physical and chemical properties and excellent processing performance. By adopting the method, the scrap AgCd produced in the production process of the AgCdO electrical contact material is recycled, the AgCd alloy element in the waste material is effectively recycled, the material turnover is fast, and the economic benefit is obvious.
Description
Technical Field
The invention relates to the technical field of electrical contact materials, in particular to a method for purifying and recycling AgCd alloy from AgCd waste materials.
Background
About 30% of AgCd waste is generated in the production and processing process of the AgCdO electric contact material, and the product cost is high due to the high proportion of the waste; in order to effectively reduce the production cost, the effective recycling of the AgCd waste is a research hotspot in recent years. The precious metal alloy AgCd in the waste is effectively separated from the harmful impurity foreign matters, and the extracted high-purity AgCd alloy is the core of waste recycling. The common AgCd waste recycling approaches are generally as follows:
1) directly used for returning and feeding; because the AgCd waste has impurity elements, the product obtained by directly feeding the AgCd waste has higher impurity element content and poorer product processing performance, and the reuse method has lower utilization rate
2) Smelting and purifying, and then feeding; in the high-temperature smelting process, AgCd waste is separated from impurity elements after being melted, impurities float on the surface of a liquid phase, and scum on the surface is removed through liquid-state slagging-off to remove impurities; however, due to the liquidity of the liquid phase, the impurity elements in the AgCd waste material cannot be completely removed, so that the processability of AgCdO products fed by the recycled materials cannot be compared with that of new materials.
The traditional AgCd recycling process cannot completely separate the precious metal AgCd alloy from impurities, so that a method for recycling the self-filtering AgCd waste is developed, bad impurities are effectively separated, a high-purity AgCd alloy raw material is extracted, and the same level of a new material is achieved; the AgCd alloy element in the waste material can be effectively utilized, the material turnover period can be greatly shortened, and the method has high practical value.
Disclosure of Invention
The invention aims to provide a method for purifying and recycling AgCd alloy from AgCd waste material, which has high purification purity of high-temperature smelting and impurity removal, and the tensile strength and elongation of the alloy reach the quality of a new material.
The technical purpose of the invention is realized by the following technical scheme:
a method for purifying and recycling AgCd alloy from AgCd waste materials is characterized by comprising the following steps:
(1) placing the AgCd waste material into a smelting furnace with the bottom of a crucible provided with foam ceramic plates with equal areas, and carrying out high-temperature smelting refining treatment on the AgCd waste material according to 3 stages: the first stage is as follows: heating to 500-600 ℃ and keeping the temperature for 0.5-1 h; and a second stage: heating to 900-1000 ℃ and keeping the temperature for 0.5-1 h; and a third stage: 900-;
(2) taking out the foamed ceramic wafer floating on the surface of the melt to obtain a high-purity AgCd alloy melt;
(3) and taking the high-purity AgCd alloy as a raw material to carry out feeding.
In the technical scheme, the foamed ceramic sheet is Al2O3SiC or ZrO2One or more combinations of (a).
In the technical scheme, the density of the foamed ceramic sheet is 0.3-1.5g/cm3Porosity of 60-90%, pore diameter20nm-1mm and 0.3-1.5mm in thickness.
The traditional AgCd waste recovery cannot effectively separate precious metals and impurity elements in the waste. Compared with the prior art, the invention has the following characteristics:
(1) placing the foam ceramic plates with equal areas at the bottom of a crucible of a smelting furnace, forming AgCd melt by waste materials at high temperature, and continuously settling impurities in pore curves when the melt flows through the interior of the foam ceramic plates due to rich and intricate pores in the foam ceramic plates, so that the slag can be effectively collected, and the impurities in the high-temperature melt are filtered;
(2) meanwhile, due to the low density of the foamed ceramic sheet, the foamed ceramic sheet is gradually discharged from the inside of the AgCd alloy under the action of wetting power and buoyancy and floats on the surface of the melt; taking out the foamed ceramic plate with the slag collected on the surface layer after refining is finished;
(3) the method can effectively solve the problem of impurities in the AgCd waste material, extracts the AgCd alloy raw material with high purity, effectively recycles and reuses the AgCd waste material generated in the production process of the AgCdO electric contact material by adopting the method that the physical and chemical properties and the processing property of the electric contact material fed by the method are equivalent to those of a new material fed product, and has the advantages of quick material turnover, no industrial three-waste pollution and remarkable economic benefit.
Detailed Description
The present invention is described in detail below by way of examples, and it should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention.
The first embodiment is as follows:
1) the density of the equal area is 0.32g/cm3The SiC foam ceramic plate with the porosity of 64 percent, the aperture of 35nm to 950um and the thickness of 0.8 mm is placed at the bottom of the crucible, then 25Kg of AgCd10.5 scraps are put in, and smelting and refining are carried out in three stages: the first stage is as follows: heating to 500 deg.C and maintaining for 0.5 h; and a second stage: heating to 900 ℃ and keeping the temperature for 0.5 h; and a third stage: cooling at 800 ℃ at a constant speed, and controlling the cooling time to be 0.5 h;
2) taking out the foamed ceramic wafer floating on the surface of the melt to obtain a high-purity AgCd alloy melt;
3) by adopting the AgCd alloy feeding AgCdO (10), the product performance pair is shown as the following table:
example two:
1) the density of the equal area is 0.42g/cm3Porosity of 78%, aperture of 45nm-865um, and thickness of 0.6 mm2O3Placing the foamed ceramic sheet at the bottom of the crucible, then adding 22Kg of AgCd13.13 leftover material, and carrying out smelting refining in three stages: the first stage is as follows: heating to 600 ℃, and keeping the temperature for 1 h; and a second stage: heating to 1000 ℃ and keeping the temperature for 1 h; and a third stage: reducing the temperature at 900 ℃ at a constant speed, and controlling the temperature reduction time to be 0.5 h;
2) taking out the foamed ceramic wafer floating on the surface of the melt to obtain a high-purity AgCd alloy melt;
3) by adopting the AgCd alloy feeding AgCdO (12), the product performance pair is shown as the following table:
example three:
1) ZrO with equal area density of 1.27g/cm3, porosity of 86%, pore diameter of 68nm-730um and thickness of 1.2 mm is prepared2Placing the foamed ceramic sheet at the bottom of the crucible, then adding 20Kg of AgCd8.75 leftover material, and carrying out smelting refining in three stages: the first stage is as follows: heating to 600 deg.C and maintaining for 0.5 h; and a second stage: heating to 1000 ℃ and keeping the temperature for 0.5 h; and a third stage: cooling at 800 ℃ at a constant speed, and controlling the cooling time to be 1 h;
2) taking out the foamed ceramic wafer floating on the surface of the melt to obtain a high-purity AgCd alloy melt;
3) when the AgCd alloy is used for feeding AgCdO (15), the product performance pair is shown as the following table:
| resistivity mu omega cm | Tensile strength MPa | Elongation percentage% | |
| Feeding of new material | 2.21 | 330 | 22 |
| The patent process feeds | 2.19 | 327 | 21 |
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (2)
1. A method for purifying and recycling AgCd alloy from AgCd waste materials is characterized by comprising the following steps:
(1) placing the AgCd waste material into a smelting furnace with the bottom of a crucible provided with foam ceramic plates with equal areas, and carrying out high-temperature smelting refining treatment on the AgCd waste material according to 3 stages: the first stage is as follows: heating to 500-600 ℃ and keeping the temperature for 0.5-1 h; and a second stage: heating to 900-1000 ℃ and keeping the temperature for 0.5-1 h; and a third stage: 900-;
(2) taking out the foamed ceramic wafer floating on the surface of the melt to obtain a high-purity AgCd alloy melt;
(3) feeding a high-purity AgCd alloy serving as a raw material;
the density of the foamed ceramic sheet is 0.3-1.5g/cm3, the porosity is 60-90%, the pore diameter is 20nm-1mm, and the thickness is 0.3-1.5 mm.
2. The method for purifying and recycling the AgCd alloy from the AgCd waste material as claimed in claim 1, wherein the method comprises the following steps: the foamed ceramic sheet is Al2O3SiC or ZrO2One or more combinations of (a).
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| CN201911046912.1A CN111020192B (en) | 2019-10-30 | 2019-10-30 | Method for purifying and recycling AgCd alloy from AgCd waste |
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| CN201911046912.1A CN111020192B (en) | 2019-10-30 | 2019-10-30 | Method for purifying and recycling AgCd alloy from AgCd waste |
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| CN111020192A CN111020192A (en) | 2020-04-17 |
| CN111020192B true CN111020192B (en) | 2021-06-22 |
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| CN115354387A (en) * | 2022-08-10 | 2022-11-18 | 包头美科硅能源有限公司 | Method for improving crystallization rate in ingot purification of monocrystalline crucible bottom waste |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1381602A (en) * | 2002-01-29 | 2002-11-27 | 上海交通大学 | Process for removing non-metal impurities from molten aluminium by ceramic filter |
| CN102031384A (en) * | 2010-11-19 | 2011-04-27 | 江苏大学 | Method for purifying magnesium alloy melt |
| CN102925694A (en) * | 2012-10-19 | 2013-02-13 | 江苏大学 | Method for remelting in-situ particle reinforced aluminum-based composite material |
| CN103820648A (en) * | 2014-02-19 | 2014-05-28 | 上海交通大学 | Magnesium alloy melt purification method |
| CN107805723A (en) * | 2017-09-15 | 2018-03-16 | 广西平果铝合金精密铸件有限公司 | A kind of purifying aluminium alloy melt method |
| CN108060317A (en) * | 2017-12-14 | 2018-05-22 | 宁夏太阳镁业有限公司 | A kind of magnesium metal and magnesium alloy refining method |
| CN109759577A (en) * | 2019-01-29 | 2019-05-17 | 大连交通大学 | The method of intensified by ultrasonic wave metal melt filtering purification |
-
2019
- 2019-10-30 CN CN201911046912.1A patent/CN111020192B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1381602A (en) * | 2002-01-29 | 2002-11-27 | 上海交通大学 | Process for removing non-metal impurities from molten aluminium by ceramic filter |
| CN102031384A (en) * | 2010-11-19 | 2011-04-27 | 江苏大学 | Method for purifying magnesium alloy melt |
| CN102925694A (en) * | 2012-10-19 | 2013-02-13 | 江苏大学 | Method for remelting in-situ particle reinforced aluminum-based composite material |
| CN103820648A (en) * | 2014-02-19 | 2014-05-28 | 上海交通大学 | Magnesium alloy melt purification method |
| CN107805723A (en) * | 2017-09-15 | 2018-03-16 | 广西平果铝合金精密铸件有限公司 | A kind of purifying aluminium alloy melt method |
| CN108060317A (en) * | 2017-12-14 | 2018-05-22 | 宁夏太阳镁业有限公司 | A kind of magnesium metal and magnesium alloy refining method |
| CN109759577A (en) * | 2019-01-29 | 2019-05-17 | 大连交通大学 | The method of intensified by ultrasonic wave metal melt filtering purification |
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Effective date of registration: 20220928 Address after: 325025 No. 308, Binhai fifth road, Wenzhou Economic and Technological Development Zone, Wenzhou City, Zhejiang Province Patentee after: Zhejiang Fuda alloy material technology Co.,Ltd. Address before: No. 518, Binhai 4th Road, Binhai Park, Wenzhou Economic and Technological Development Zone, Zhejiang Province, 325000 Patentee before: FUDA ALLOY MATERIALS Co.,Ltd. |