CN111663050A - Copper waste pretreatment for copper continuous casting process and method for smelting copper by using copper waste pretreatment - Google Patents
Copper waste pretreatment for copper continuous casting process and method for smelting copper by using copper waste pretreatment Download PDFInfo
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/117—Refining the metal by treating with gases
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to a method for pretreating copper waste and smelting copper by the copper waste for a copper continuous casting process, wherein the length, the width and the height of a package block packed by the copper waste are controlled to be less than or equal to 45cm multiplied by 25cm multiplied by 30cm, and the weight of a single package is controlled to be less than or equal to 80 kg; the charging amount is less than or equal to 12 bags/furnace, the heating temperature in a hydrogen furnace is 450 +/-50 ℃, hydrogen with the pressure of +0.1mpa is introduced, and the treatment time is 2-4 hours; the adding proportion of the pretreated copper waste in the smelting operation is as follows: and respectively adding the pretreated copper waste and the electrolytic copper plate into an upper-induction smelting furnace for smelting, wherein the adding proportion of the pretreated copper waste is 8-22% of the total adding amount. Has the advantages that: the method solves the problem of high content of oil stain and oxides in the copper waste, effectively removes impurities in the copper waste in the smelting process through heating treatment and hydrogen reduction, improves the quality of subsequent smelted copper products, improves the adding proportion of the copper waste under the same condition, and improves the conductivity of the smelted copper rod.
Description
Technical Field
The invention belongs to the field of copper smelting and processing, and particularly relates to a copper waste pretreatment method for a copper continuous casting process and a copper smelting method thereof.
Background
The waste copper is used as one of main raw materials for refining copper and comprises old waste copper and new waste copper, wherein the old waste copper comes from old equipment, old machines, abandoned buildings and underground pipelines; the new copper scrap comes from the copper fillings that the processing factory abandoned (the output ratio of copper product is about 50%), and general copper scrap supply is more stable, and the copper scrap can divide into: the grade of the bare copper is more than 90%; brass (wire) copper-containing materials (old motor, circuit board); copper produced from scrap copper and other similar materials is also known as reclaimed copper. At present, the method for recovering pure copper waste materials is mainly based on a pyrogenic process, and the main process is as follows: the pure copper waste is firstly sorted manually, the waste which does not meet the requirement is removed, then impurities, oil stains and the like are removed, and the pure copper waste is put into a high-temperature furnace for melting and ingot casting, and finally refined copper is prepared through electrolytic refining. The pyrogenic process for treating the scrap copper is mainly used for treating leftover materials generated by cutting, continuous casting and the like in enterprises, is gradually popularized to be used for direct refining of various scrap copper along with the maturity of the process, and has the characteristics of large treatment capacity, low requirement on raw materials and the like. The melting time of the scrap copper feeding materials is long. The scrap copper added into the furnace is solid cold material and is a wrapped block formed by beating blocky, powder and filiform materials, the feeding speed is low, the melting time is long, in the scrap copper fire refining, the feeding and melting time accounts for more than half of the operation period, and the consumed fuel accounts for more than 80% of the total amount, so the feeding speed and the melting speed have great influence on the production efficiency and the energy consumption in the scrap copper fire refining.
The scrap copper refining process is a patent technology of scrap copper smelting, continuous casting and continuous rolling production successfully developed in the middle of the 80 th century abroad, impurities in the scrap copper form dimensional compounds through chemical refining and deep oxidation reduction, the copper content of the produced low-oxygen bright copper rod is more than 99.93 percent, and the electric conductivity is improved from 100.4 percent IACS to 100.9 percent IACS. The classification of scrap copper in the united states is more stringent and, therefore, the recovery process is more refined. Of which pyrometallurgical smelting is an important part. The regeneration copper industry in China develops a plurality of mature processes after decades of development, and impurities in scrap copper can be further removed in an oxidation stage when the pyrogenic process treatment mainly comprises reverberatory furnace process, tilting furnace process and Kaldo furnace process reverberatory furnace smelting, but the degree of automation is low, and the environmental pollution is serious.
Reference documents: liu kai "resource regeneration" 2018(08) a technical scheme in the prior art is that waste copper containing impurities (mainly oil stains and oxides) is subjected to shallow precipitation in the recycling status of pure copper waste materials, and the waste copper is mainly extrusion flash, waste copper wires, waste copper bars and other waste materials generated in the copper processing process, are extruded, packaged and formed, and then are directly returned to a furnace and are put into refined electrolytic copper in proportion for pyrometallurgy. The traditional process has the defects that oil stains and oxides contained in the copper waste can not be completely and effectively removed through pyrometallurgy, so the copper waste must be put in according to the strict proportion of the impurity-containing condition of the waste, and if the adding proportion of the copper waste is too high, the conductivity of the up-drawing copper rod is unqualified; the copper scrap is qualified in conductivity even if the adding proportion of the copper scrap is too low, but the utilization rate of the copper scrap is reduced, so that the copper smelting cost is increased.
Copper smelting processing needs to be researched to effectively remove impurities in copper scraps in the smelting process so as to improve the quality of subsequent smelted copper products; meanwhile, aiming at improving the adding proportion of the put-in pretreated copper scraps under the same condition or aiming at realizing the aim of reducing the production cost based on the adding proportion of the put-in pretreated copper scraps and the electrolytic copper plate when different copper melt weights still exist in the continuous production furnace.
Disclosure of Invention
The invention aims to overcome the defects of the technology and provides a copper waste pretreatment method for a copper continuous casting process and a copper smelting method thereof, wherein the impurity content in the waste can be effectively reduced by the copper waste pretreatment method; the adding proportion of the pretreated copper waste can be improved under the same condition in the copper smelting process; or when different weights of basic copper melt liquid exist in the continuous production furnace, the pretreated copper waste and the electrolytic copper plate are respectively put in according to the accurate adding proportion, so that the conductivity of the subsequent smelted copper product can be improved, and the production cost is reduced.
In order to achieve the purpose, the invention adopts the following technical scheme: a copper scrap pretreatment and copper smelting method for a copper continuous casting process is characterized by comprising the following steps: control the packet volume of packing, weight and packet dress furnace volume of packing in pyrometallurgical refined copper waste material technology, improve copper waste material edulcoration effect, improve the preliminary treatment copper waste material proportion of adding under the same condition in smelting copper technology, and guarantee to smelt the conductivity of back copper pole, concrete step is:
the volume and the weight of a package block for controlling the packaging of the copper waste are as follows: the length, width and height of the copper scrap ladle block are less than or equal to 45cm multiplied by 25cm multiplied by 30cm, and the weight of a single ladle is less than or equal to 80 kg;
secondly, controlling the charging amount of the copper scrap package blocks: putting the copper scrap packet blocks into a hydrogen furnace for treatment, wherein the charging amount is less than or equal to 12 packets/furnace; heating in a hydrogen furnace at 450 + -50 deg.C, introducing hydrogen gas at +0.1mpa, and treating for 2-4 hr;
thirdly, adding proportion of the pretreated copper waste in the smelting operation: respectively adding the pretreated copper waste and the electrolytic copper plate into an upper-induction smelting furnace, and carrying out smelting operation, wherein the adding proportion of the pretreated copper waste is 8-22% of the total adding amount, the total adding amount is the sum of the weight of the electrolytic copper plate and the weight of the pretreated copper waste, and the adding proportion of the pretreated copper waste is multiplied by 100% of the weight of the pretreated copper waste/(the weight of the electrolytic copper plate and the weight of the pretreated copper waste).
Controlling the charging amount of the copper scrap package blocks: the distance between the copper scrap wrapped blocks placed in the hydrogen furnace is more than or equal to 10cm, and the distance between the copper scrap wrapped blocks and the furnace wall is more than or equal to 15 cm.
The adding proportion of the pretreated copper scraps in the third step is related to the weight of the base copper melt liquid which is still stored in the upward smelting furnace based on continuous production, the weight of the base copper melt liquid determines the proportion of the weight of the electrolytic copper plate and the weight of the pretreated copper scraps put into the furnace, namely the adding proportion of the total adding amount, and when the weight of the base copper melt liquid is 5-6.5 tons, the adding proportion of the pretreated copper scraps in the total adding amount is 8-10%; when the weight of the basic copper melt is 6.5-8 tons, the addition proportion of the pretreated copper waste accounting for the total addition amount is 10% -16%; when the weight of the basic copper melt is 8-9.5 tons, the addition proportion of the pretreated copper scrap in the total addition amount is 16-22%.
The smelting operation in the third step is based on continuous production, the weight of the basic copper melt in the upward smelting furnace is 6.5 tons, and the optimal adding proportion of the pretreated copper waste in the total adding amount is 14%.
The copper waste is extrusion flash, waste copper wire or waste copper bar produced in the copper processing process.
Has the advantages that: compared with the prior art, the method can effectively solve the problem of high content of oil stain and oxide in the copper waste, can effectively remove impurities in the copper waste in the smelting process through heating treatment and hydrogen reduction, improves the quality of a subsequent smelting copper product through reducing the content of the impurities in the waste, improves the adding proportion of the copper waste under the same condition, improves the conductivity of the smelted copper rod, and further reduces the production cost.
Detailed Description
The following detailed description of the preferred embodiments will be made in conjunction with the accompanying drawings.
The embodiment provides a method for pretreating copper waste and smelting copper by the copper waste for a copper continuous casting process, wherein the volume, the weight and the charging amount of a packed block are controlled in a pyrometallurgical copper waste refining process, the impurity removal effect of the copper waste is improved, the addition proportion of the pretreated copper waste is improved under the same condition in a copper smelting process, and the conductivity of a smelted copper rod is ensured, and the method comprises the following specific steps:
the volume and the weight of a package block for controlling the packaging of the copper waste are as follows: the length, width and height of the copper scrap ladle block are less than or equal to 45cm multiplied by 25cm multiplied by 30cm, and the weight of a single ladle is less than or equal to 80 kg;
secondly, controlling the charging amount of the copper scrap package blocks: putting the copper scrap packet blocks into a hydrogen furnace for treatment, wherein the charging amount is less than or equal to 12 packets/furnace; heating in a hydrogen furnace at 450 + -50 deg.C, introducing hydrogen gas at +0.1mpa, and treating for 2-4 hr;
thirdly, adding proportion of the pretreated copper waste in the smelting operation: respectively adding the pretreated copper waste and the electrolytic copper plate into an upper-induction smelting furnace, and carrying out smelting operation, wherein the adding proportion of the pretreated copper waste is 8-22% of the total adding amount, the total adding amount is the sum of the weight of the electrolytic copper plate and the weight of the pretreated copper waste, and the adding proportion of the pretreated copper waste is multiplied by 100% of the weight of the pretreated copper waste/(the weight of the electrolytic copper plate and the weight of the pretreated copper waste).
The preferable scheme of this embodiment is that the control of the charging amount of the copper scrap briquette: the distance between the copper scrap wrapped blocks placed in the hydrogen furnace is more than or equal to 10cm, and the distance between the copper scrap wrapped blocks and the furnace wall is more than or equal to 15 cm.
The best copper scrap in this embodiment is extrusion flash, waste copper wire or waste copper bar generated in the copper processing process.
The smelting operation in the method is based on continuous production, so that basic copper melt liquid still exists in the smelting furnace, the proportion of the weight of the electrolytic copper plate and the weight of the pretreated copper scrap (namely the adding proportion of the total adding amount) added into the furnace is related to the weight of the basic copper melt liquid existing in the furnace, and when the weight of the basic copper melt liquid is 5-6.5 tons, the adding proportion of the pretreated copper scrap accounting for the total adding amount is 8-10%; when the weight of the basic copper melt is 6.5-8 tons, the addition proportion of the pretreated copper waste accounting for the total addition amount is 10% -16%; when the weight of the basic copper melt is 8-9.5 tons, the addition proportion of the pretreated copper scrap in the total addition amount is 16-22%.
The optimization of the embodiment: the smelting operation in the third step is based on continuous production, the weight of the basic copper melt in the upper-lead smelting furnace is 6.5 tons, and the optimal adding proportion of the pretreated copper waste in the total adding amount is 14%.
Principle of operation
1. The packing size is too large, so that the metal flow of hydrogen in the inner bag is not facilitated, and particularly the central part cannot achieve the ideal reduction effect;
2. the single weight is too large, so that the packaging is too compact, the metal in the bag is too compact, the pores are small, the hydrogen in the bag is not easy to flow, and particularly the central part cannot achieve the ideal reduction effect;
3. the oil stain volatilization is influenced by the excessive charging amount, and the hydrogen circulation is ensured by the package block spacing;
4. during specific production, continuous production is performed, basic copper melt liquid must still exist in the upward-leading smelting furnace, and when the basic copper melt liquid keeps different weights, the proportion of the weight of the pretreated copper waste material in the total adding amount is accurate, so that the qualified conductivity of the upward-leading copper rod can be ensured, and the production cost can be reduced.
Process flow and apparatus
The common hydraulic baling press of the common equipment is adopted to collect and bale the copper waste into bale blocks, and the workshop uses RJ type well annealing furnace and external heating type heating. Loading the workpiece to be treated into a material rack or a material basket according to requirements, stably hanging the workpiece into a furnace container, covering a furnace cover, hanging the workpiece into a furnace chamber, pre-vacuumizing, then filling nitrogen, vacuumizing again, then filling hydrogen for heat treatment to remove impurities, keeping constant pressure of hydrogen, igniting a hydrogen outlet, collecting tail gas, heating, preserving heat and cooling to finish the process. The RJ type well annealing furnace is used in the embodiment, but the RJ type well annealing furnace is not limited to the RJ type well annealing furnace, and can be various horizontal type annealing furnaces and vertical type annealing furnaces as long as the process temperature can be realized, hydrogen is introduced for reduction, and the operation safety is ensured; feeding and smelting: 8000 tons of red copper upward continuous casting machine set is used for feeding and smelting. The same principle can be used for other models of horizontal continuous casting machine sets. Firstly, checking whether the temperature and the pressure of cooling water meet the production requirements, confirming the liquid level, ensuring that the upper part of copper melt is completely covered by charcoal, and the covering thickness is 80-100mm to isolate air contact and prevent oxidation, placing an electrolytic copper plate or packed waste on a furnace mouth for preheating for 3-15 minutes to remove surface moisture before feeding, and avoiding splashing accidents or high oxygen content of products caused by the fact that moisture is brought into the furnace. And slowly hoisting the baked electrolytic copper plate or the baked packaged waste into a smelting furnace, wherein the feeding speed is determined according to the number of the guide rods and the speed of the guide rods. The smelting temperature in the process is 1150 +/-10 ℃. Meanwhile, the liquid level stability is ensured as much as possible, and temperature reduction or liquid level fluctuation caused by too fast feeding is avoided. Starting a traction device to start a guide rod, wherein the initial guide speed is generally controlled to be 200-700 mm/min; adjusting the flow rate of cooling water to make the temperature difference between inlet water and outlet water be about 15 ℃; after the copper rod is led out, the lead rod is detached, and the copper rod is led into a wire rewinding machine through a wire guiding device to be rewound. And (3) controlling the speed of the guide rod during normal production: the traction speed is generally controlled to be 200-1200 mm/min, and the corresponding traction frequency is 250-550 times/min.
As shown in Table 1, the addition ratio of the pretreated copper scrap to the total amount of the copper scrap added is determined by the weight of the basic copper melt in the melting furnace
TABLE 1
The weight of the basic copper solution in the furnace is the weight of the copper solution which is still in the up-drawing furnace under the condition of no feeding;
the adding proportion is the adding proportion of the pretreated copper waste material in the total adding amount in each time. For example, at a 6.5 ton basis copper solution weight in the furnace, the proportion of the pretreated copper scrap added to the total amount added is determined by the above table to be 10%. If the total amount of the electrolytic copper plate added (by weight) in the smelting furnace is 1 ton, 0.9 ton of the electrolytic copper plate is added, and 0.1 ton of the pretreated copper scrap is added, namely 0.1/(0.1+ 0.9). times.100% ~ 10% (the same calculation in the following examples); if the total amount of the added copper (by weight) in the smelting furnace is 9 tons, 8.1 tons of the electrolytic copper plate are added, 0.9 ton of the pretreated copper waste is added, and the like.
Example 1
When continuous smelting operation is carried out, the amount of basic copper solution in a copper smelting furnace is 6.5 tons, 1 ton of pretreated copper waste and 9 tons of electrolytic copper plates are respectively put into an upper-leading smelting furnace, the pretreated copper waste accounts for 10 percent of the total amount of the copper waste, and the conductivity of an upper-leading copper rod is detected to be 100.4 percent IACS after smelting.
Example 2
The copper scrap was packed in a weight of 60kg with dimensions of 45cm by 25cm by 30 cm. And (3) treating the packed copper waste by using a hydrogen furnace, wherein the charging amount is 10 packages, the distance between the packing blocks is 10cm, and the distance between the packing blocks and the furnace wall is 15 cm. The treatment temperature is 400 ℃, hydrogen is introduced in the process, the pressure of the hydrogen is +0.1mpa, and the treatment process time is 4 hours; when continuous smelting operation is carried out, the amount of basic copper melt in a copper smelting furnace is 6.5 tons, 1 ton of pretreated copper scrap and 9 tons of electrolytic copper plate are respectively put into an upper-leading smelting furnace, the pretreated copper scrap accounts for 10 percent of the total amount of the copper scrap, and the conductivity of an upper-leading copper rod is detected to be 102.1 percent IACS after smelting.
Example 3
The copper scrap was baled to a bale weight of 60kg with dimensions of 45cm by 25cm by 30 cm. And (3) treating the packed copper waste by using a hydrogen furnace, wherein the charging amount is 10 packages, the distance between each package and the furnace wall is 10cm, and the distance between each package and the furnace wall is 15 cm. The treatment temperature is 500 ℃, hydrogen is introduced in the process, the pressure of the hydrogen is +0.1mpa, and the treatment process time is 2 hours; when continuous smelting operation is carried out, the amount of basic copper molten liquid in the copper smelting furnace is 9.5 tons, 2.2 tons of pretreated copper waste and 7.8 tons of electrolytic copper plates are respectively put into the upper-leading smelting furnace when the continuous smelting operation is carried out, the pretreated copper waste accounts for 22 percent of the total addition amount, and the conductivity of the upper-leading copper rod is detected to be 100.4 percent IACS after smelting.
Example 4
The copper scrap was packed in a weight of 60kg with dimensions of 45cm by 25cm by 30 cm. And (3) treating the packed copper waste by using a hydrogen furnace, wherein the charging amount is 10 packages, the distance between the packing blocks is 10cm, and the distance between the packing blocks and the furnace wall is 15 cm. The treatment temperature is 450 ℃, hydrogen is introduced in the process, the pressure of the hydrogen is +0.1mpa, and the treatment process time is 3 hours; when continuous smelting operation is carried out, the amount of basic copper molten liquid in a copper smelting furnace is 5 tons, 0.8 ton of pretreated copper waste and 9.2 tons of electrolytic copper plates are respectively put into an upper-leading smelting furnace, the pretreated copper waste accounts for 8 percent of the total addition amount, and the conductivity of an upper-leading copper rod is detected to be 101.6 percent IACS after smelting.
Example 5
The copper scrap was packed in a weight of 60kg with dimensions of 45cm by 25cm by 30 cm. And (3) treating the packed copper waste by using a hydrogen furnace, wherein the charging amount is 10 packages, the distance between the packing blocks is 10cm, and the distance between the packing blocks and the furnace wall is 15 cm. The treatment temperature is 500 ℃, hydrogen is introduced in the process, the pressure of the hydrogen is +0.1mpa, and the treatment process time is 3 hours; when continuous smelting operation is carried out, the amount of basic copper molten liquid in a copper smelting furnace is 8 tons, 1.6 tons of pretreated copper waste and 8.4 tons of electrolytic copper plates are respectively put into an upper-leading smelting furnace, the pretreated copper waste accounts for 16 percent of the total amount of the copper scrap, and the conductivity of an upper-leading copper rod is detected to be 100.9 percent IACS after smelting.
Example 6
The copper scrap was packed in a weight of 60kg with dimensions of 45cm by 25cm by 30 cm. And (3) treating the packed copper waste by using a hydrogen furnace, wherein the charging amount is 6 packages, the distance between the packing blocks is 10cm, and the distance between the packing blocks and the furnace wall is 15 cm. The treatment temperature is 420 ℃, hydrogen is introduced in the process, the pressure of the hydrogen is +0.1mpa, and the treatment process time is 3.5 hours; when continuous smelting operation is carried out, the amount of basic copper solution in a copper smelting furnace is 8.5 tons, 2 tons of pretreated copper waste and 8 tons of electrolytic copper plates are respectively put into an upper-leading smelting furnace, the pretreated copper waste accounts for 20 percent of the total amount of the copper waste, and the conductivity of an upper-leading copper rod is detected to be 100.8 percent IACS after smelting.
Example 7
Preferably, the copper scrap is baled to a bale weight of 60kg having dimensions of 45cm x 25cm x 30 cm. And (3) treating the packed copper waste by using a hydrogen furnace, wherein the charging amount is 10 packages, the distance between the packing blocks is 10cm, and the distance between the packing blocks and the furnace wall is 15 cm. The treatment process is 450 ℃, hydrogen is introduced in the process, the pressure of the hydrogen is +0.1mpa, and the treatment process time is 3 hours; when continuous smelting operation is carried out, the amount of basic copper solution in a copper smelting furnace is 6.5 tons, 1.4 tons of pretreated copper waste and 8.6 tons of electrolytic copper plates are respectively put into an upper-leading smelting furnace, the pretreated copper waste accounts for 14 percent of the total amount of the pretreated copper waste, and the conductivity of an upper-leading copper rod is detected to be 101.2 percent IACS after smelting.
Conclusion
As can be seen from the above examples, the conductivity of the upward-drawing copper rod in the example 1 is 100.4% IACS in the processes of feeding and smelting without the process of the invention; the adding proportion of the pretreated copper scrap in the embodiment 2 is the same as that in the embodiment 1, and the conductivity of the obtained upward-leading copper rod under the process condition of implementing the invention is 102.1 percent IAC, which is better than that in the embodiment 1; the addition ratio of the waste copper materials in the examples 3-6 is higher than that in the example 1, the conductivity of the upward-drawing copper rod obtained under the process condition of implementing the invention is the same as that in the example 1, but the addition ratio of the pre-treated copper waste materials is obviously higher than that in the example 1, so that the production cost is greatly reduced. Example 7 is the best mode of the invention.
The above detailed description of the method for copper scrap pretreatment for copper continuous casting process and copper smelting thereof with reference to the embodiments is illustrative and not restrictive, and several embodiments may be enumerated in accordance with the limitations, so that variations and modifications thereof without departing from the general concept of the present invention shall fall within the scope of the present invention.
Claims (5)
1. A copper scrap pretreatment and copper smelting method for a copper continuous casting process is characterized by comprising the following steps: control the packet volume of packing, weight and packet dress furnace volume of packing in pyrometallurgical refined copper waste material technology, improve copper waste material edulcoration effect, improve the preliminary treatment copper waste material proportion of adding under the same condition in smelting copper technology, and guarantee to smelt the conductivity of back copper pole, concrete step is:
the volume and the weight of a package block for controlling the packaging of the copper waste are as follows: the length, width and height of the copper scrap ladle block are less than or equal to 45cm multiplied by 25cm multiplied by 30cm, and the weight of a single ladle is less than or equal to 80 kg;
secondly, controlling the charging amount of the copper scrap package blocks: putting the copper scrap packet blocks into a hydrogen furnace for treatment, wherein the charging amount is less than or equal to 12 packets/furnace; heating in a hydrogen furnace at 450 + -50 deg.C, introducing hydrogen gas at +0.1mpa, and treating for 2-4 hr;
thirdly, adding proportion of the pretreated copper waste in the smelting operation: respectively adding the pretreated copper waste and the electrolytic copper plate into an upper-induction smelting furnace, and carrying out smelting operation, wherein the adding proportion of the pretreated copper waste is 8-22% of the total adding amount, the total adding amount is the sum of the weight of the electrolytic copper plate and the weight of the pretreated copper waste, and the adding proportion of the pretreated copper waste is multiplied by 100% of the weight of the pretreated copper waste/(the weight of the electrolytic copper plate and the weight of the pretreated copper waste).
2. The method of claim 1, further comprising: controlling the charging amount of the copper scrap package blocks: the distance between the copper scrap wrapped blocks placed in the hydrogen furnace is more than or equal to 10cm, and the distance between the copper scrap wrapped blocks and the furnace wall is more than or equal to 15 cm.
3. The method of claim 1, further comprising: the adding proportion of the pretreated copper scraps in the third step is related to the weight of the base copper melt liquid which is still stored in the upward smelting furnace based on continuous production, the weight of the base copper melt liquid determines the proportion of the weight of the electrolytic copper plate and the weight of the pretreated copper scraps put into the furnace, namely the adding proportion of the total adding amount, and when the weight of the base copper melt liquid is 5-6.5 tons, the adding proportion of the pretreated copper scraps in the total adding amount is 8-10%; when the weight of the basic copper melt is 6.5-8 tons, the addition proportion of the pretreated copper waste accounting for the total addition amount is 10% -16%; when the weight of the basic copper melt is 8-9.5 tons, the addition proportion of the pretreated copper scrap in the total addition amount is 16-22%.
4. The method of claim 3, wherein: the smelting operation in the third step is based on continuous production, the weight of the basic copper melt in the upward smelting furnace is 6.5 tons, and the optimal adding proportion of the pretreated copper waste in the total adding amount is 14%.
5. The method of claim 1, further comprising: the copper waste is extrusion flash, waste copper wire or waste copper bar produced in the copper processing process.
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| CN114645136A (en) * | 2022-03-16 | 2022-06-21 | 杭州富通集团有限公司 | Processing technology of copper rod |
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