CN112410604A - Method for reducing impurity aluminum in brass melt - Google Patents
Method for reducing impurity aluminum in brass melt Download PDFInfo
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- CN112410604A CN112410604A CN202011286126.1A CN202011286126A CN112410604A CN 112410604 A CN112410604 A CN 112410604A CN 202011286126 A CN202011286126 A CN 202011286126A CN 112410604 A CN112410604 A CN 112410604A
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- brass
- copper
- aluminum
- melt
- refining agent
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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
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/04—Alloys based on copper with zinc as the next major constituent
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for reducing impurity aluminum in a brass melt, and belongs to the technical field of copper melt purification. The main treatment process comprises the steps of pretreating the brass raw material, melting, adding a refining agent and casting into ingots. The brass raw material is crushed in two stages, then is magnetically separated and is sent into an induction furnace to be melted, a refining agent is added after the material is completely changed into a liquid state, and the ingot is cast after heat preservation is carried out for 15-30 min. The aluminum content in the cast ingot is reduced by more than 50 percent, and a feasible method is provided for removing aluminum from the brass melt.
Description
Technical Field
The invention belongs to the technical field of copper melt purification, and particularly relates to a method for reducing impurity aluminum in a brass melt.
Technical Field
In order to improve certain properties of the brass alloy, other alloy elements form complex brass on the basis of simple brass, wherein the surface ionization tendency of the aluminum element is greater than that of zinc, a dense and firm aluminum oxide film is preferentially formed, further oxidation of the alloy is prevented, and the corrosion resistance of the alloy is improved. The aluminum brass has excellent seawater corrosion resistance, is usually made into pipes, and is used for the industries of ship manufacturing, seawater desalination, thermal power generation and the like. The scrapped aluminum brass can become new urban solid waste, and causes pollution to the environment. The recycling of the waste aluminum brass not only solves the environmental problem, but also makes up the deficiency of the copper resource in China, and is a project benefiting the nation and the people.
In the recovery process of the waste aluminum brass, other complex brasses with similar colors, such as lead brass, manganese brass, tin brass and the like, are easily mixed together and are difficult to distinguish due to appearance identification. The impurity removal problem is faced when the brass is used for producing any complex brass, and because of the activity of zinc element, a plurality of slagging impurity removal methods are not feasible, thereby bringing great problems to production. Aiming at the problem of high content of aluminum element in the brass melt, the enterprise develops project research, finds an aluminum removal method, solves the production problem and provides technical support for refining the brass melt.
Disclosure of Invention
The invention aims to solve the production problem that aluminum brass is contained in the brass recovery and aluminum is removed, provides a method for reducing impurity aluminum in a brass melt, realizes the technical control of impurity elements in the brass melt, solves the problem that waste aluminum brass is difficult to separate in a pretreatment stage, and provides strong competitiveness for enterprises to produce complex brass alloy products.
The invention is realized by the following technical scheme.
A method for reducing impurity aluminum in a brass melt comprises the steps of pretreatment of brass raw materials, melting, adding a refining agent and casting into ingots, and is characterized in that:
a. carrying out three-stage sorting and two-stage crushing on the brass raw material in a pretreatment stage to sort out impurity materials as far as possible;
b. feeding the screened brass material into an induction furnace, adding a refining agent after the brass material is completely melted, and keeping the temperature for 15-30 min;
c. casting into ingots after heat preservation and slag removal.
Further, the three-stage sorting and two-stage crushing in the pretreatment stage are (1) sorting out impurity materials such as silver-plated copper, mechanical copper, white copper, sound copper sheets, iron, stainless steel, zinc alloy, aluminum alloy, plastic, rubber and the like, (2) roughly crushing to further sort out the impurity materials, (3) crushing the roughly crushed yellow impure copper again to sort out iron, stainless steel, zinc alloy, aluminum alloy, plastic, rubber and the like to obtain crushed copper of coarse materials and fine materials;
further, the refining agent is a mixture of copper-cerium alloy particles and sodium fluoride, the theoretical addition of the copper-cerium alloy is calculated by CeAl12, the actual addition is 1.05-1.45 times of the theoretical amount, and the addition of the sodium fluoride is 0.05-0.15% of the weight of the melt;
further, the temperature is reduced to 920-.
Aiming at the problem that the aluminum brass or other aluminum-containing substances mixed in the brass are mixed in the recovery process to cause high content of impurity element aluminum in the raw materials, the invention innovatively provides a method for reducing impurity aluminum in a brass melt, and the brass raw materials are subjected to three-stage sorting and two-stage crushing in the pretreatment stage to sort out impurity materials as far as possible; feeding the screened brass material into an induction furnace, adding a refining agent after the brass material is completely melted, and keeping the temperature for 15-30 min; casting into ingots after heat preservation and slag removal. By detecting the content of the aluminum element in the raw material and the cast ingot, the comparison result shows that the content of the impurity element aluminum is reduced by more than 50 percent, and the purpose of purifying the brass melt is realized.
Detailed Description
A method for reducing impurity aluminum in a brass melt comprises the steps of pretreating brass raw materials, melting, adding a refining agent, casting into ingots, and is characterized in that the brass raw materials are subjected to three-stage sorting and two-stage crushing in a pretreatment stage, and impurity materials are separated as far as possible; feeding the screened brass material into an induction furnace, adding a refining agent after the brass material is completely melted, and keeping the temperature for 15-30 min; casting into ingots after heat preservation and slag removal. The three-stage sorting and two-stage crushing in the pretreatment stage are (1) sorting out impurity materials such as silver-plated copper, mechanical copper, white copper, sound copper sheets, iron, stainless steel, zinc alloy, aluminum alloy, plastic and rubber, (2) roughly crushing to further sort out the impurity materials, (3) crushing the roughly crushed yellow impure copper again to sort out iron, stainless steel, zinc alloy, aluminum alloy, plastic, rubber and the like to obtain crushed copper of coarse materials and fine materials; the refining agent is a mixture of copper-cerium alloy particles and sodium fluoride, the theoretical addition of the copper-cerium alloy is calculated by CeAl12, the actual addition is 1.05-1.45 times of the theoretical amount, and the addition of the sodium fluoride is 0.05-0.15% of the weight of the melt; the temperature is reduced to 920-1080 ℃ before the refining agent is added, and the temperature is raised to 1030-1080 ℃ before the slag is fished after the heat preservation is finished. The content of aluminum element in the cast copper ingot is reduced by more than 50 percent, and a feasible method is provided for melt purification.
Example 1
The brass raw material mixed with the aluminum brass is subjected to three-stage sorting and two-stage crushing in a pretreatment stage, the material is sent into an induction furnace to be melted, and after the material is completely melted, the components of the brass raw material are measured by a sampling electric spark direct-reading spectrometer to be Cu 59.321%, Zn 39.143%, Al 1.013% and the balance of the content of other impurity elements. Adding a refining agent (the weight of Ce in the Cu-Ce alloy is 0.6 percent of that of the brass melt and the weight of sodium fluoride is 0.1 percent of that of the melt), keeping the temperature for 20min, then, fishing out slag, casting into ingots, taking the components measured by the mass of the upper end and the lower end of each ingot, and taking the average value, wherein the content of Cu 60.011 percent, Zn 39.321 percent, Al 0.458 percent and the balance of other impurity elements, and the calculation of a comparative experiment result shows that the content of the impurity element aluminum is reduced by 54.79 percent.
Example 2
The raw material of the brass mixed with the aluminum brass is subjected to three-stage sorting and two-stage crushing in a pretreatment stage, the material is sent into an induction furnace to be melted, and after the material is completely melted, the components of the brass mixed with the aluminum brass measured by a sampling electric spark direct-reading spectrometer are Cu 60.322%, Zn 36.124%, Al 0.892% and the balance of other impurity elements. Adding a refining agent (the weight of Ce in the Cu-Ce alloy is 0.5 percent of the weight of the brass melt, and the weight of sodium fluoride is 0.1 percent of the weight of the melt), keeping the temperature for 20min, then fishing out slag, casting into ingots, taking the components measured by the mass at the upper end and the lower end of each ingot, and taking the average value, wherein the content of Cu is 60.531 percent, Zn is 36.431 percent, Al is 0.129 percent, and the balance is the content of other impurity elements, and the calculation of a comparative experiment result shows that the content of the impurity element aluminum is reduced by 85.54 percent.
Example 3
The brass raw material mixed with the aluminum brass is subjected to three-stage sorting and two-stage crushing in a pretreatment stage, the material is sent into an induction furnace to be melted, and after the material is completely melted, the components of the brass raw material are Cu 62.321%, Zn 34.987%, Al 1.457% and the balance of the brass raw material is the content of other impurity elements measured by a sampling electric spark direct-reading spectrometer. Adding a refining agent (the weight of Ce in the Cu-Ce alloy is 0.83 percent of that of the brass melt, and the weight of sodium fluoride is 0.1 percent of that of the melt), keeping the temperature for 20min, then fishing out slag, casting into ingots, taking the components measured by the mass of the upper end and the lower end of each ingot, and taking the average value, wherein the content of Cu 62.433 percent, Zn 35.021 percent, Al 0.689 percent and the balance of other impurity elements, and calculating according to the comparative experiment result to reduce the content of the impurity element aluminum by 52.71.
Example 4
The raw material of the yellow impure copper mixed with the aluminum brass is subjected to three-stage sorting and two-stage crushing in a pretreatment stage, the material is sent into an induction furnace to be melted, and after the material is completely melted, the components of the yellow impure copper mixed with the aluminum brass measured by a sampling electric spark direct-reading spectrometer are Cu 61.333%, Zn 37.012%, Al 1.035%, and the balance of other impurity elements. And after the temperature is kept for 20min, the slag is fished out, ingots are cast, the components measured by the mass at the upper end and the lower end of each ingot are taken as the average value, wherein the content of Cu 61.342%, Zn 37.001%, Al 1.028% and the balance of other impurity elements are calculated, and the content of the impurity element aluminum is almost unchanged by comparison with experimental results.
Claims (4)
1. A method for reducing impurity aluminum in a brass melt comprises the steps of pretreatment of brass raw materials, melting, adding a refining agent and casting into ingots, and is characterized in that:
(1) carrying out three-stage sorting and two-stage crushing on the brass raw material in a pretreatment stage to sort out impurity materials as far as possible;
(2) feeding the screened brass material into an induction furnace, adding a refining agent after the brass material is completely melted, and keeping the temperature for 15-30 min;
(3) casting into ingots after heat preservation and slag removal.
2. The method for reducing the impurity aluminum in the brass melt as claimed in claim 1, wherein the pretreatment stage comprises three-stage sorting and two-stage crushing, namely (1) sorting out impurity materials such as silver-plated copper, mechanical copper, white copper, bronze, iron, stainless steel, zinc alloy, aluminum alloy, plastic and rubber, (2) roughly crushing to further sort out the impurity materials, (3) crushing the roughly crushed brass again to sort out iron, stainless steel, zinc alloy, aluminum alloy, plastic and rubber, and the like, so as to obtain coarse crushed copper and fine crushed copper.
3. The method of claim 1, wherein the refining agent is a mixture of particles of a copper-cerium alloy and sodium fluoride, the theoretical addition amount of the copper-cerium alloy is 1.05-1.45 times of the theoretical amount calculated as CeAl12, and the sodium fluoride is 0.05-0.15% of the weight of the melt.
4. The method as claimed in claim 1, wherein the temperature of the refining agent is lowered to 920-1000 ℃ before the refining agent is added, and the temperature is raised to 1030-1080 ℃ before the slag is fished after the heat preservation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011286126.1A CN112410604A (en) | 2020-11-17 | 2020-11-17 | Method for reducing impurity aluminum in brass melt |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011286126.1A CN112410604A (en) | 2020-11-17 | 2020-11-17 | Method for reducing impurity aluminum in brass melt |
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| CN112410604A true CN112410604A (en) | 2021-02-26 |
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| CN202011286126.1A Pending CN112410604A (en) | 2020-11-17 | 2020-11-17 | Method for reducing impurity aluminum in brass melt |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6473035A (en) * | 1987-09-14 | 1989-03-17 | Yoshida Kogyo Kk | Cu shape memory alloy |
| CN101403056A (en) * | 2008-11-26 | 2009-04-08 | 路达(厦门)工业有限公司 | Rare earth manganese brass alloy and producing process thereof |
| CN101514398A (en) * | 2009-04-03 | 2009-08-26 | 中南大学 | High Cu-RE interalloy refining agent for refining scrap copper and preparation and application thereof |
| CN102925744A (en) * | 2012-10-25 | 2013-02-13 | 江西理工大学 | Leadless brass alloy and preparation method thereof |
| CN109112350A (en) * | 2018-08-29 | 2019-01-01 | 宁波兴敖达金属新材料有限公司 | High tough corrosion resistant alumin(i)um yellow brass web pre fetching and preparation method thereof |
| CN109763005A (en) * | 2019-01-23 | 2019-05-17 | 北京科技大学 | A method of reducing complicated pluralism brass alloys impurity elements of ferrum |
| CN110117726A (en) * | 2019-05-17 | 2019-08-13 | 北京科技大学 | A kind of composite refining method reducing brass alloys Determination of Multi-Impurities |
| CN110791678A (en) * | 2019-10-18 | 2020-02-14 | 郑州机械研究所有限公司 | Copper-based joint coating alloy and preparation method thereof |
| CN110951985A (en) * | 2019-11-25 | 2020-04-03 | 河南科技大学 | Preparation method of copper or copper alloy material and refining agent for refining |
-
2020
- 2020-11-17 CN CN202011286126.1A patent/CN112410604A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6473035A (en) * | 1987-09-14 | 1989-03-17 | Yoshida Kogyo Kk | Cu shape memory alloy |
| CN101403056A (en) * | 2008-11-26 | 2009-04-08 | 路达(厦门)工业有限公司 | Rare earth manganese brass alloy and producing process thereof |
| CN101514398A (en) * | 2009-04-03 | 2009-08-26 | 中南大学 | High Cu-RE interalloy refining agent for refining scrap copper and preparation and application thereof |
| CN102925744A (en) * | 2012-10-25 | 2013-02-13 | 江西理工大学 | Leadless brass alloy and preparation method thereof |
| CN109112350A (en) * | 2018-08-29 | 2019-01-01 | 宁波兴敖达金属新材料有限公司 | High tough corrosion resistant alumin(i)um yellow brass web pre fetching and preparation method thereof |
| CN109763005A (en) * | 2019-01-23 | 2019-05-17 | 北京科技大学 | A method of reducing complicated pluralism brass alloys impurity elements of ferrum |
| CN110117726A (en) * | 2019-05-17 | 2019-08-13 | 北京科技大学 | A kind of composite refining method reducing brass alloys Determination of Multi-Impurities |
| CN110791678A (en) * | 2019-10-18 | 2020-02-14 | 郑州机械研究所有限公司 | Copper-based joint coating alloy and preparation method thereof |
| CN110951985A (en) * | 2019-11-25 | 2020-04-03 | 河南科技大学 | Preparation method of copper or copper alloy material and refining agent for refining |
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Application publication date: 20210226 |