A combined refining process method of high melting point waste copper scrap

Abstract

The present application relates to a kind of high melting point waste copper raw materials combined refining process method, the process method is completed by melting shaft furnace and continuous furnace cooperation, including the following steps: S1, before starting every furnace, carry out batching calculation;S2, melting shaft furnace first provides the required amount of copper liquid as matrix metal to continuous furnace, then from the continuous furnace mouth to continuous furnace bath adds the required amount of high melting point waste copper raw material, inserts reduction pipe into copper liquid and passes into natural gas, agitates copper liquid, and all high melting point waste copper raw material is melted into Cu-X alloy solution;S3, Cu-X alloy solution is transported to casting system and cast;The present application not only enables combined refining process to handle high melting point waste copper raw material, but also fully utilizes the characteristics of high thermal efficiency (70-75%) of melting shaft furnace, more economical (continuous furnace thermal efficiency 15-30%) of shaft furnace melting high-grade waste copper raw material, and fast melting speed of shaft furnace, greatly saves operation time and reduces energy consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of copper smelting, and in particular to a combined refining process method for high-melting-point scrap copper raw materials. BACKGROUND

[0002] In the combined refining process production, the melting shaft furnace and the continuous refining furnace (hereinafter referred to as "continuous furnace") jointly complete the copper production operation: the melting shaft furnace is used as a melting furnace to continuously melt the high-grade (Cu higher than 98%) scrap copper raw material into copper liquid, and continuously deliver the copper liquid to the continuous furnace through the heat preservation chute. The continuous furnace is used as a refining furnace, which functions to input the copper liquid from the copper inlet into the shaft furnace and accumulate in the molten pool, remove impurities and oxygen from the shaft furnace copper liquid through refining operation, and then deliver the copper liquid to the casting system to cast anode copper plates.

[0003] According to the copper smelting practice, the melting temperature of the copper raw material needs to be higher than the melting point temperature of the raw material by 50-100℃, so that it can be normally melted; the smelting temperature needs to be higher than the melting point temperature of the raw material by 100-150℃. The smelting temperature in the shaft furnace is 1120-1130℃, and the highest is 1150℃. The melting point temperature of the raw material that can be melted is 1050-1100℃. At present, the high-grade scrap copper raw material treated by the melting shaft furnace contains more than 98% of copper, and its melting point is basically equivalent to that of pure copper (1083℃), which is in the temperature range of 1050-1100℃. The high-melting-point scrap copper raw material with a melting point higher than 1100℃ cannot be melted by the melting shaft furnace, which greatly limits the raw material range of the combined refining process. SUMMARY

[0004] The purpose of the present application is to solve the above problems. The combined refining process method for high-melting-point scrap copper raw materials is a solution to the problem that the melting shaft furnace can only be used to melt high-grade scrap copper raw materials and cannot melt high-melting-point scrap copper raw materials, which greatly limits the raw material range of the combined refining process. The present application saves operation time and reduces energy consumption.

[0005] The specific scheme of the present application is: a combined refining process method for high-melting-point scrap copper raw materials, which is completed by the cooperation of a melting shaft furnace and a continuous furnace, and includes the following steps:

[0006] S1, before starting each furnace, the burden calculation is carried out, first, the Cu-X alloy solution theoretical melting point temperature is set, wherein X is the main high melting point element in the high melting point scrap copper raw material, the temperature range is 1083-1120 DEG C; then, according to the Cu-X binary phase diagram, the proportion of X element in the Cu-X alloy solution corresponding to the melting point temperature is determined; then, according to the single furnace output, the input amount of high melting point element X of each furnace is calculated; then, according to the content of high melting point element X in the high melting point scrap copper raw material, the high melting point scrap copper raw material addition amount is calculated; finally, the copper liquid amount provided by the melting shaft furnace for this furnace is obtained by subtracting the high melting point scrap copper raw material addition amount from the single furnace output;

[0007] S2, the melting shaft furnace first provides the calculated amount of copper liquid as the base metal to the continuous furnace, then the calculated amount of high melting point scrap copper raw material is added to the continuous furnace from the continuous furnace mouth to the continuous furnace pool, then the reduction pipe is inserted into the copper liquid to pass through the natural gas, and the high melting point scrap copper raw material is fully melted into Cu-X alloy solution;

[0008] S3, the Cu-X alloy solution is transported to the casting system for casting.

[0009] Further, the natural gas flow in the step S2 in the application is controlled at 150-350 Nm3 / h, and the nitrogen gas is mixed with 25-40% of the natural gas flow.

[0010] Further, in the continuous furnace smelting process in the application, the surface of the pool is covered with charcoal, and the amount is 0.3-0.5% of the weight of the charge, so that the thickness of the charcoal layer reaches 10-15 cm.

[0011] The combined refining process of the application inputs the high-grade scrap copper raw material melted by the melting shaft furnace into the copper liquid of the continuous furnace, the copper liquid is used as the Cu-X alloy base metal, and the high melting point element X is diluted at the same time, and the melting point of the obtained Cu-X alloy melt is between copper and high melting point scrap copper.

[0012] The application not only enables the combined refining process to treat high melting point scrap copper raw material, but also fully utilizes the high thermal efficiency (70-75%) of the melting shaft furnace, the economy of the melting shaft furnace for high-grade scrap copper (the thermal efficiency of the continuous furnace is 15-30%), and the fast melting speed of the melting shaft furnace, thereby greatly saving the operation time and reducing the energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the structural schematic diagram of the process equipment in the application.

[0014] In the figure: 1 - furnace mouth, 2 - reduction pipe, 3 - pool, 4 - continuous furnace, 5 - copper inlet, 6 - copper liquid, 7 - chute, 8 - melting shaft furnace. DETAILED DESCRIPTION

[0015] The technical solutions of the present application will be described clearly and completely below in combination with the drawings of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0016] The present application is a combined refining process method of high melting point waste copper raw materials, which is completed by cooperation of a melting shaft furnace and a continuous furnace, and comprises the following steps.

[0017] S1, before starting each furnace, perform ingredient calculation, first set the theoretical melting point temperature of Cu-X alloy solution, wherein X is the main high melting point element in the high melting point waste copper raw materials, the temperature range is 1083-1120℃; then determine the proportion of X element in the Cu-X alloy solution at the corresponding melting point temperature according to the binary phase diagram of Cu-X; then calculate the input amount of high melting point element X for each furnace according to the single furnace output; then calculate the high melting point waste copper raw material addition amount according to the content of high melting point element X in the high melting point waste copper raw materials; finally, subtract the high melting point waste copper raw material addition amount from the single furnace output to obtain the amount of copper liquid provided by the melting shaft furnace for this furnace;

[0018] S2, the melting shaft furnace first provides the calculated amount of copper liquid as the base metal to the continuous furnace, then adds the calculated amount of high melting point waste copper raw materials to the continuous furnace from the furnace mouth of the continuous furnace, then inserts the reduction pipe into the copper liquid to pass in natural gas, and stirs the copper liquid to completely melt the high melting point waste copper raw materials into Cu-X alloy solution;

[0019] S3, the Cu-X alloy solution is transported to the casting system for casting.

[0020] Further, the flow of natural gas introduced in step S2 in the present application is controlled at 150-350 Nm3 / h, and 25-40% of the flow of natural gas is mixed with nitrogen.

[0021] Further, in the continuous furnace smelting process in the present application, the surface of the molten pool is covered with charcoal, and the amount is 0.3-0.5% of the weight of the charge, so as to maintain the thickness of the charcoal layer to 10-15 cm.

[0022] The combined refining process method of the present application melts the high-grade waste copper raw materials in the melting shaft furnace to input copper liquid to the continuous furnace, the copper liquid serves as the Cu-X alloy base metal, and at the same time dilutes the high melting point element X, and the melting point of the obtained Cu-X alloy melt is between copper and high melting point waste copper.

[0023] The specific embodiments of the present application will be described below with Cu-Ni. Embodiment

[0024] Referring to Figure 1 , a combined refining process method of high melting point scrap copper raw material of the present application: it is completed by melting shaft furnace 8 and continuous furnace 4 cooperation. Before each furnace start, the calculation of ingredients: the high melting point scrap copper raw material to be processed is B30 white copper (copper-nickel alloy containing 30% Ni), the melting point temperature of Cu-Ni binary phase diagram is 1228.7℃, which exceeds the maximum melting temperature of the melting shaft furnace, and Ni is the main high melting point element in the high melting point scrap copper raw material B30 white copper.

[0025] First, set the theoretical melting point temperature of Cu-Ni alloy solution as 1120℃ (continuous furnace smelting temperature 1220℃-100℃); then, according to the Cu-Ni binary phase diagram, the proportion of Ni element in Cu-Ni alloy solution corresponding to the melting point temperature should be 5%; then, according to the single furnace output of 180t, the input amount of high melting point element Ni per furnace is calculated as 9t; then, according to the content of high melting point element Ni in high melting point scrap copper raw material B30 white copper, the addition amount of high melting point scrap copper raw material B30 white copper is calculated as 30t; finally, the copper liquid amount 150t provided by the shaft furnace for this furnace is obtained by subtracting 30t from the single furnace output of 180t.

[0026] After the start of the furnace, the melting shaft furnace first provides 150t of copper liquid 6 as the base metal to the continuous furnace, and then adds 30t of high melting point scrap copper raw material B30 white copper to the molten pool 3 of the continuous furnace from the continuous furnace mouth 2. Then, natural gas is inserted into the reduction pipe 2 to agitate the copper liquid to fully mix and heat exchange with the B30 white copper raw material, accelerate melting, and finally melt all the high melting point scrap copper raw material into Cu-Ni alloy solution. The Cu-Ni alloy solution is transported to the casting system for casting. In the above process, the natural gas flow is controlled at 250Nm 3 / h, and nitrogen gas is mixed into the natural gas at a flow rate of 75Nm 3 / h. The natural gas is used to stir the molten pool, while removing the oxygen absorbed by the copper liquid and Cu-Ni alloy solution.

[0027] During the continuous furnace smelting process, the surface of the molten pool is covered with charcoal, and the amount of charcoal used is 0.5-0.9t to maintain a charcoal layer thickness of 10-15cm.

[0028] Nitrogen gas is mixed into the natural gas to avoid black smoke caused by insufficient combustion of natural gas. During the continuous furnace smelting process, the surface of the molten pool is covered with charcoal, and the amount of charcoal used is 0.3-0.5% of the weight of the charge to maintain a charcoal layer thickness of 10-15cm, which reduces the oxygen absorption of the copper liquid and Cu-Ni alloy solution, and at the same time improves the fluidity of the alloy solution.

[0029] The present application not only enables the combined refining process to treat high melting point waste copper raw materials, but also fully utilizes the high thermal efficiency (70-75%) of the melting shaft furnace, the economy of melting high grade waste copper raw materials in the shaft furnace (15-30% of the continuous furnace thermal efficiency), and the fast melting speed of the shaft furnace, thereby greatly saving the operation time and reducing the energy consumption.

Claims

1. A combined refining process for high melting point scrap copper raw materials, characterized in that: The process is completed by the cooperation of a melting shaft furnace and a continuous furnace, and includes the following steps: S1. Before each heat is started, a batching calculation is performed. First, the theoretical melting point temperature of the Cu-X alloy solution is set, where X is the main high-melting-point element in the high-melting-point scrap copper raw material, and the temperature range is 1083°C to 1120°C; then, based on the binary phase diagram of Cu-X, the proportion of the X element in the Cu-X alloy solution at the corresponding melting point temperature is determined; then, based on the output of a single heat, the input amount of the high-melting-point element X for each heat is calculated; then, based on the content of the high-melting-point element X in the high-melting-point scrap copper raw material, the amount of high-melting-point scrap copper raw material added is calculated; finally, the amount of copper liquid required to be provided by the melting shaft furnace for that heat is obtained by subtracting the amount of high-melting-point scrap copper raw material added from the output of a single heat; S2, melting vertical furnace first provides the required amount of copper liquid as base metal into the continuous furnace, then adds the required amount of high melting point scrap copper raw material into the continuous furnace molten pool from the continuous furnace mouth, then inserts the reduction tube into the copper liquid and introduces natural gas, stirs the copper liquid, and melts all the high melting point scrap copper raw material into Cu-X alloy solution; the natural gas flow rate introduced in the above steps is 150~350Nm 3 / h control, mixing 25-40% of the natural gas flow rate of nitrogen into the natural gas; S3, Cu-X alloy solution is transported to the casting system for casting; During the continuous furnace smelting process, the surface of the molten pool is covered with charcoal, the amount of which is 0.3-0.5% of the weight of the charge, to maintain a charcoal layer thickness of 10-15 cm.

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