CN110117725B - Low-temperature fire refining method for quickly purifying waste and impure brass - Google Patents
Low-temperature fire refining method for quickly purifying waste and impure brass Download PDFInfo
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- CN110117725B CN110117725B CN201910413846.0A CN201910413846A CN110117725B CN 110117725 B CN110117725 B CN 110117725B CN 201910413846 A CN201910413846 A CN 201910413846A CN 110117725 B CN110117725 B CN 110117725B
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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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- 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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Abstract
The invention provides a low-temperature fire refining method for quickly purifying waste and impure brass, belonging to the field of refiningIn the technical field of metallurgical refining. The method adds oxidizing slag agent with the average diameter less than 10mm into the scrap brass melt, wherein the oxidizing slag agent comprises 1-99% of ZnO and 1-99% of Cu2O, 0-98 percent of CuO and 0-50 percent of CaO oxidizing slag former, wherein the addition amount of the oxidizing slag former is 1-20 percent of the mass of the waste miscellaneous brass; then oxidizing and refining for 20-240min at 800-1400 ℃; after the oxidation slagging refining is finished, the refining slag is added, and the composition of the refining slag is 1-99 percent B2O3、1％‑99％CaO、0‑98％Na2SiF6The adding amount of the refining slag is 1 to 20 percent of the mass of the waste miscellaneous brass, the processing time is 20 to 240min, and the temperature is 800 to 1400 ℃; then, standing the brass liquid for 5-300 min; finally, carrying out slag skimming treatment, and casting to obtain the brass with the purity of 99-99.99%. The method can be operated under normal pressure, has low cost and high efficiency, and can be used for large-scale industrial production.
Description
Technical Field
The invention relates to the technical field of metallurgical refining, in particular to a low-temperature fire refining method for quickly purifying waste and impure brass.
Background
The waste mixed brass is derived from copper-containing waste generated in the smelting process and the processing process of copper and copper waste equipment, and comprises waste electric wires, copper plates, copper foils, copper ash and the like. The impurities contained in the scrap brass, namely the Cu-Zn alloy, are mainly Al, Si, Mn, Zn, Fe, Ni, As, Sb, Pb, Sn and the like, but the raw material sources are complex, so that the types and the components of the impurities contained in the scrap brass are different, and the treatment difficulty of the recovery process is increased. The effective recovery of the scrap brass can play an important role in making up copper resources.
The traditional method for refining the scrap copper is fire refining, has the advantages of energy conservation, consumption reduction, low environmental pollution and the like, and is popular among people. For example, patent CN103937994A "a deep deoxidation process for copper pyrometallurgical refining" proposes a technology of effective deep deoxidation; patent CN107532234A "fire refining of blister copper" proposes a method for effectively controlling the oxygen and sulfur content in blister copper. However, these methods are not suitable for scrap brass because brass contains a relatively high content of metallic zinc, which is more easily oxidized than copper. If the refining is carried out by fire, a large amount of zinc is oxidized and lost.
Disclosure of Invention
The invention aims to solve the technical problem of providing a low-temperature fire refining method for quickly purifying waste and impure brass, which selects a proper slag agent and adopts a low-temperature slagging refining mode to carry out slagging, oxidation and efficient impurity removal on a waste and impure brass solution. Finally, the production process for refining the scrap brass, which has the advantages of low cost, high efficiency, low temperature and easy control, is provided.
The method comprises the following steps:
(1) adding an oxidizing slag former into the waste mixed brass melt, wherein the oxidizing slag former comprises 1-99% of ZnO and 1-99% of Cu2O, 0-98 percent of CuO, 1-50 percent of CaO, and the addition amount of the slag former is 1-20 percent of the mass of the waste miscellaneous brass;
(2) refining the waste mixed brass melt added with the oxidizing slag former in the step (1) for 20-240min at the smelting temperature of 800-1400 ℃;
(3) after the oxidation slagging refining is finished, the refining slag is added, and the composition of the refining slag is 1-99 percent B2O3、1％-99％CaO、0-98％Na2SiF6The adding amount of the refining slag is 1 to 20 percent of the mass of the waste miscellaneous brass, the processing time is 20 to 240min, and the temperature is 800 to 1400 ℃; then, standing the brass liquid for 5-300 min;
(4) and (4) carrying out slagging-off treatment on the waste miscellaneous brass liquid after standing in the step (3), and then casting to obtain the brass blocks with the purity of 99-99.99%.
Wherein, the average diameter of the oxidizing slag agent in the step (1) is less than 10 mm.
In the step (1), the mass fraction of Zn in the scrap brass is 5-50%.
The technical scheme of the invention has the following beneficial effects:
in the scheme, the method can be operated under normal pressure, has low cost and high efficiency, and can be used for large-scale industrial production. The method uses the special oxidizing slag agent to carry out slagging, refining and impurity removal on the scrap brass liquid, has the remarkable advantages of low refining temperature, high impurity removal efficiency and the like, and particularly can greatly reduce impurities such as Pb, Fe, Si, S, Al and the like in the scrap brass, and the removal rate exceeds 90%. The method is suitable for the pyrometallurgical refining of the scrap brass, and the purity of the copper subjected to slagging, oxidizing and pyrometallurgical refining reaches 99-99.99%.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description is given with reference to specific embodiments.
The invention provides a low-temperature fire refining method for quickly purifying waste and impure brass.
The method comprises the following steps:
(1) adding an oxidizing slag former into the waste mixed brass melt, wherein the oxidizing slag former comprises 1-99% of ZnO and 1-99% of Cu2O, 0-98 percent of CuO, 1-50 percent of CaO, and the addition amount of the slag former is 1-20 percent of the mass of the waste miscellaneous brass;
(2) refining the waste mixed brass melt added with the slag former in the step (1) for 20-240min at the melting temperature of 800-1400 ℃;
(3) after the oxidation slagging refining is finished, the refining slag is added, and the composition of the refining slag is 1-99 percent B2O3、1％-99％CaO、0-98％Na2SiF6The adding amount of the refining slag is 1 to 20 percent of the mass of the waste miscellaneous brass, the processing time is 20 to 240min, and the temperature is 800 to 1400 ℃; standing the brass liquid for 5-300min, and then carrying out slag skimming treatment;
(4) and (4) casting the waste mixed brass liquid subjected to slagging-off treatment in the step (3) to obtain a brass block.
The following description is given with reference to specific examples.
Example 1
1) Adding an oxidizing slag former with the average diameter of less than 10mm into a high-temperature reactor containing the waste copper oxide solution, wherein the oxidizing slag former comprises 50% of ZnO and 20% of Cu2O、20％CuO、10％CaO；
2) The addition amount of the oxidizing slag former is 5 percent of the mass of the waste mixed brass;
3) the slagging and smelting temperature of the scrap brass is 1300 ℃;
4) after the oxidation slagging refining is finished, the refining slag is added, and the composition of the refining slag is 50 percent B2O3、20％CaO、30％Na2SiF6；
5) The adding amount of the refining slag is 20 percent of the mass of the waste miscellaneous brass, and the processing time is 20 min;
6) the treatment temperature of the refining slag is 800 ℃;
7) standing the brass liquid for 300min, and then carrying out slag skimming treatment;
8) finally, casting is carried out to obtain the brass with the purity of 99.9 percent.
Example 2
1) Adding an oxidizing slag former with the average diameter of less than 5mm into a high-temperature reactor containing the waste copper oxide solution, wherein the oxidizing slag former comprises 20% of ZnO and 50% of Cu2O、30％CaO；
2) The addition amount of the oxidizing slag former is 10 percent of the mass of the waste mixed brass;
3) the slagging and smelting temperature of the scrap brass is 800 ℃;
4) after the oxidation slagging refining is finished, the refining slag is added, and the composition of the refining slag is 70 percent B2O3、30％CaO；
5) The adding amount of the refining slag is 15 percent of the mass of the waste miscellaneous brass, and the processing time is 70 min;
6) the treatment temperature of the refining slag is 1000 ℃;
7) standing the brass liquid for 100min, and then carrying out slag skimming treatment;
8) finally, casting is carried out to obtain the brass with the purity of 99.99 percent.
Example 3
1) Adding an oxidizing slag former with the average diameter of less than 3mm into a high-temperature reactor containing the waste copper oxide solution, wherein the oxidizing slag former comprises 10% of ZnO and 20% of Cu2O、40％CuO、30％CaO；
2) The addition amount of the oxidizing slag former is 20 percent of the mass of the waste mixed brass;
3) the slagging and smelting temperature of the scrap brass is 900 ℃;
4) after the oxidation slagging refining is finished, the refining slag is added, and the composition of the refining slag is 20 percent B2O3、40％CaO、40％Na2SiF6；
5) The adding amount of the refining slag is 5 percent of the mass of the waste miscellaneous brass, and the processing time is 240 min;
6) the treatment temperature of the refining slag is 1100 ℃;
7) standing the brass liquid for 60min, and then carrying out slag skimming treatment;
8) finally, casting is carried out to obtain the brass with the purity of 99.9 percent.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (2)
1. A low-temperature fire refining method for rapidly purifying waste and impure brass is characterized in that: the method comprises the following steps:
(1) adding an oxidizing slag former into the waste mixed brass melt, wherein the oxidizing slag former comprises 1-99% of ZnO and 1-99% of Cu2O, 0-98 percent of CuO, 0-50 percent of CaO, and the addition amount of the slag former is 1-20 percent of the mass of the waste miscellaneous brass;
(2) refining the waste mixed brass melt added with the oxidizing slag former in the step (1) for 20-240min at the smelting temperature of 800-1400 ℃;
(3) after the oxidation slagging refining is finished, the refining slag is added, and the composition of the refining slag is 1-99 percent B2O3、1％-99％CaO、0-98％Na2SiF6The adding amount of the refining slag is 1 to 20 percent of the mass of the waste miscellaneous brass, the processing time is 20 to 240min, and the temperature is 800 to 1400 ℃; then, standing the brass liquid for 5-300 min;
(4) carrying out slag skimming treatment on the waste miscellaneous brass liquid after standing in the step (3), and then casting to obtain a brass block;
the average diameter of the oxidizing slag agent in the step (1) is less than 10 mm;
the mass fraction of Zn in the scrap brass in the step (1) is 5-50%.
2. The low-temperature fire refining method for rapidly purifying scrap brass according to claim 1, wherein: the purity of the brass blocks obtained in the step (4) is 99-99.99%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910413846.0A CN110117725B (en) | 2019-05-17 | 2019-05-17 | Low-temperature fire refining method for quickly purifying waste and impure brass |
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| CN201910413846.0A CN110117725B (en) | 2019-05-17 | 2019-05-17 | Low-temperature fire refining method for quickly purifying waste and impure brass |
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| CN110117725A CN110117725A (en) | 2019-08-13 |
| CN110117725B true CN110117725B (en) | 2020-10-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102560145B (en) * | 2012-02-17 | 2013-09-18 | 重庆重冶铜业有限公司 | Process for purifying miscellaneous copper |
| CN104894412A (en) * | 2015-04-16 | 2015-09-09 | 新疆大学 | Method for removing impurity during copper and copper alloy melting process |
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