Copper refining reduction heat preservation process utilizing natural gas and carbon powder

Abstract

The invention discloses a copper refining reduction heat preservation process utilizing natural gas and carbon powder, which comprises the following steps: S1, melting: adding a regenerated copper processing material into a refining furnace body, and heating and melting to obtain high-temperature copper liquid; s2, oxidizing and slagging are conducted, specifically, a slagging agent is added into the copper liquid, compressed air is introduced, oxygen in the compressed air and impurity elements in the copper liquid are subjected to an oxidizing reaction, and oxidized refining slag is formed; s3, reduction is conducted, specifically, natural gas is pressurized through a supercharger, the pressurized natural gas is conveyed into the copper liquid through a reduction valve set, the copper liquid is continuously stirred in the conveying process, and the natural gas and the copper liquid make full contact and are subjected to a reduction reaction; the natural gas is pressurized, and the pressurized natural gas is introduced into the copper liquid through the gas nozzle, so that the natural gas can drive the copper liquid to roll in the furnace body while reacting with the copper liquid, the natural gas is in full contact with the copper liquid, the reduction time is shortened, and the reduction efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of copper refining and reduction, and in particular relates to a copper refining and reduction insulation process using natural gas and carbon powder. Background Art

[0002] Traditional copper reduction refining uses coke to remove oxygen from the copper liquid. After the reduction is completed, charcoal is used to cover the liquid surface for insulation. This process does not cause the copper liquid to tumble violently, and the contact between the coke and the copper liquid is limited, resulting in low oxygen removal efficiency and long removal time. In addition, the amount of charcoal required to cover the copper liquid for insulation is large and the cost is high. Summary of the invention

[0003] In order to solve the above problems existing in the prior art, the present invention aims to provide a copper refining reduction and insulation process using natural gas and carbon powder.

[0004] The technical solution adopted by the present invention comprises the following steps:

[0005] S1, melting: adding the recycled copper processing materials into the refining furnace body, heating and melting to obtain high-temperature copper liquid;

[0006] S2, oxidation slag making: adding slag making agent to the copper liquid, and introducing compressed air, so that the oxygen in the compressed air reacts with the impurity elements in the copper liquid to form oxidized refined slag;

[0007] S3, reduction: using a supercharger to pressurize the natural gas, and delivering the pressurized natural gas to the copper liquid through a reduction valve group, and continuously stirring the copper liquid during the delivery process, so that the natural gas and the copper liquid are fully in contact and a reduction reaction occurs;

[0008] S4, covering and keeping warm: after the reaction is finished, carbon powder is covered on the copper liquid to keep warm.

[0009] Among them, the slag-forming agent materials are silicon dioxide materials and calcium oxide-containing materials; the pressure of the pressurized natural gas is 0.3Mpa-0.5Mpa.

[0010] As a preferred embodiment of the present invention, the pressurized natural gas is transported into the copper liquid through the reduction valve group, and the copper liquid is continuously stirred during the transportation process, which specifically includes: the pressurized natural gas is transported into the copper liquid through the gas nozzle device after passing through the reduction valve group, and the gas nozzle continuously stirs the copper liquid during the transportation process.

[0011] As a preferred embodiment of the present invention, in S1, the refining furnace is heated to 1300°C and then the recycled copper is put into the refining furnace; in S3, the temperature in the furnace is maintained at 1150°C-1170°C during reduction.

[0012] As a preferred embodiment of the present invention, the slag-forming agent is added in an amount of 0.12%-0.25% of the mass of the copper liquid.

[0013] As a preferred embodiment of the present invention, the mass ratio of the silicon dioxide material to the calcium oxide-containing material is 1:2.

[0014] As a preferred embodiment of the present invention, the method of delivering gas to the gas nozzle through the reduction valve group specifically comprises the following steps:

[0015] Open the nitrogen inlet main valve to allow nitrogen to be transported into the copper liquid through the electromagnetic pneumatic valve, the one-way valve and the outlet main valve in sequence;

[0016] Close the nitrogen inlet main valve and open the natural gas inlet main valve, so that the natural gas can be transported to the copper liquid through the electromagnetic pneumatic valve, flow meter, one-way valve and outlet main valve in sequence.

[0017] As a preferred embodiment of the present invention, the flow meter controls the flow rate in the pipeline to be within 300-400m3 / h; and the air pressure is controlled within 0.3Mpa-0.5Mpa.

[0018] As a preferred embodiment of the present invention, the air nozzle device comprises:

[0019] a positioning disc on which a telescopic rail is formed;

[0020] A turntable, rotatably connected to the positioning disc, wherein an arc groove is provided through the turntable;

[0021] A telescopic slide rod is slidably connected in the telescopic rail, a gas cavity is formed inside the telescopic slide rod, the gas cavity is connected to the restoration valve group, and air nozzles are provided at both ends of the telescopic slide rod, and the air nozzles form an angle with the axis of the telescopic slide rod.

[0022] As a preferred embodiment of the present invention, a sliding block is fixedly provided at one end of the telescopic sliding rod, and the sliding block is slidably matched with the arc-shaped groove, and one of the gas nozzles is fixedly connected to the sliding block and communicated with the gas cavity.

[0023] As a preferred embodiment of the present invention, a plurality of telescopic rails are provided, and the plurality of telescopic rails are distributed in a circular array along the circumference of the positioning disk, and each of the telescopic rails corresponds to one telescopic sliding rod.

[0024] The beneficial effects of the present invention are:

[0025] The invention is a copper refining reduction and heat preservation process using natural gas and carbon powder. The invention uses natural gas with safety, economy and environmental protection characteristics as a reduction medium, so that the reduction avoids the generation of sulfides. At the same time, the combustion of natural gas generates a large amount of heat, and the heat of combustion can keep the temperature in the refining furnace to meet the temperature required for the reaction. The natural gas is pressurized and the pressurized natural gas is introduced into the copper liquid through a gas nozzle, so that the natural gas reacts with the copper liquid. The natural gas can drive the copper liquid to roll in the furnace body, so that the natural gas and the copper liquid are fully in contact, the reduction time is shortened, and the reduction efficiency is improved. After the reduction is completed, the copper liquid is covered with carbon powder, which can reduce the amount of xylose used and achieve the same covering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0027] Figure 1 is a flow chart of the present invention;

[0028] Figure 2 It is a schematic structural diagram of the nozzle device of the present invention;

[0029] Figure 3 The present invention Figure 2 A in the figure is an enlarged structural diagram.

[0030] In the figure: 1. Positioning disc; 2. Turntable; 3. Telescopic slide bar; 4. Air nozzle; 11. Telescopic rail;

[0031] 21. arc groove; 31. sliding block; 32. gas chamber. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0034] Example 1

[0035] The refining furnace is heated to 1300℃, 800kg of recycled copper raw material is put into the refining furnace, and high-temperature copper liquid is obtained after heating for 2 hours; 1kg of slag-forming agent is added to the copper liquid, and compressed air is injected through the reduction valve group at the same time, and refined slag is formed after stirring and reacting for 1 hour; after the refined slag is taken out, the nitrogen inlet main valve is opened, and nitrogen is injected to replace the compressed air in the reduction valve group for 4 times, and then 0.3Mpa natural gas is sent through the reduction valve group delivery pipeline at a flow rate of 300m 3 / h is transported to the gas nozzle, and the natural gas is injected into the copper liquid through the gas nozzle. At the same time, the copper liquid is stirred through the gas nozzle to make the natural gas and the copper liquid react fully. The temperature is maintained at 1150°C during the reaction. The reaction is completed after 1.5 hours. Carbon powder is covered on the copper liquid. After keeping the temperature for 1.5 hours, 750kg of copper liquid is obtained.

[0036] Example 2

[0037] The refining furnace is heated to 1300℃, 1000kg of recycled copper raw material is put into the refining furnace, and high-temperature copper liquid is obtained after heating for 2h; 1.2kg of slag-forming agent is added to the copper liquid, and compressed air is injected through the reduction valve group at the same time, and refined slag is formed after stirring and reacting for 1h; after the refined slag is taken out, the nitrogen inlet main valve is opened, and nitrogen is injected to replace the compressed air in the reduction valve group for 4 times, and then 0.4Mpa natural gas is sent through the reduction valve group delivery pipeline at a flow rate of 300m 3 / h is transported to the gas nozzle, and the natural gas is injected into the copper liquid through the gas nozzle. At the same time, the copper liquid is stirred through the gas nozzle to make the natural gas and the copper liquid fully react. The temperature is maintained at 1150°C during the reaction. The reaction is completed after 1.8 hours. Carbon powder is covered on the copper liquid. After keeping warm for 1.5 hours, 850kg of copper liquid is obtained.

[0038] Comparative Example

[0039] The refining furnace is heated to 1300°C, and 1000kg of recycled copper raw material is put into the refining furnace. After heating for 2 hours, high-temperature copper liquid is obtained; 1.2kg of slag-forming agent is added to the copper liquid, and compressed air is injected through the reduction valve group at the same time. Refined slag is formed after stirring and reacting for 1 hour; after the refined slag is taken out, 300kg of coke is added to the refining furnace. The temperature is maintained at 1150°C during the reaction. After the reaction is completed after 4 hours, carbon powder is covered on the copper liquid. After keeping warm for 1.5 hours, 850kg of copper liquid is obtained.

[0040] In Example 1, Example 2 and the comparative example provided in this embodiment, pressurized natural gas is introduced into the copper liquid. During the process of conveying the copper liquid with the natural gas, the movement of the gas nozzle in the copper liquid is utilized to accelerate the contact and mixing of the copper liquid and the natural gas, thereby shortening the reaction time of the copper liquid by one half, and the method has good practicality and economy.

[0041] Working principle of the present invention:

[0042] The present invention utilizes natural gas to reduce recycled copper. Natural gas has the characteristics of safety, economy and environmental protection. In addition, by pressurizing the natural gas and transporting the pressurized natural gas, during the transportation process, since the positioning disc 1 is fixedly installed at the bottom of the refining furnace, the circumference of the positioning disc 1 is telescopically provided with a plurality of telescopic slide rods 3, and gas nozzles 4 are obliquely provided at both ends of the telescopic slide rod 3. The gas nozzle 4 sprays the pressurized natural gas obliquely upward at the bottom of the copper liquid, thereby increasing the stroke of the natural gas shuttling in the copper liquid, improving the full contact between the natural gas and the copper liquid to accelerate the reaction of the copper liquid, thereby shortening the reduction time and improving the reduction efficiency. During the extension and retraction of the telescopic slide rod 3, since a turntable 2 is rotatably provided on the positioning disc 1, a sliding block 31 is fixedly provided on the upper end of the telescopic slide rod 3, and the telescopic slide rod 3 is slidably matched in the arc groove 21 provided on the turntable 2 through the sliding block 31, thereby realizing that the turntable 2 is driven to extend and retract back and forth along the circumference of the turntable 2, thereby changing the different positions of the nozzle at the bottom of the copper liquid to achieve stirring and mixing of the copper liquid.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A copper refining reduction and heat preservation process using natural gas and carbon powder, characterized in that: The following steps are involved: S1, melting: adding the recycled copper processing materials into the refining furnace body, heating and melting to obtain high-temperature copper liquid; S2, oxidation slag making: adding slag making agent to the copper liquid, and introducing compressed air, so that the oxygen in the compressed air reacts with the impurity elements in the copper liquid to form oxidized refined slag; S3, reduction: using a supercharger to pressurize the natural gas, and delivering the pressurized natural gas to the copper liquid through a reduction valve group, and continuously stirring the copper liquid during the delivery process, so that the natural gas and the copper liquid are fully in contact and a reduction reaction occurs; S4, covering and keeping warm: after the reaction is finished, cover the copper liquid with carbon powder to keep warm; Among them, the slag-forming agent materials are silicon dioxide materials and calcium oxide-containing materials; the pressure of the pressurized natural gas is 0.3Mpa-0.5Mpa.

2. The copper refining reduction and heat preservation process using natural gas and carbon powder according to claim 1 is characterized in that: The step of delivering the pressurized natural gas to the copper liquid through the reduction valve group and continuously stirring the copper liquid during the delivery process specifically includes: delivering the pressurized natural gas to the copper liquid through the reduction valve group and then through the gas nozzle device, and continuously stirring the copper liquid during the delivery process.

3. The copper refining reduction and heat preservation process using natural gas and carbon powder according to claim 1 is characterized in that: In S1, the refining furnace is heated to 1300°C and then the recycled copper is put into the refining furnace; in S3, the temperature in the furnace is maintained at 1150°C-1170°C during reduction.

4. The copper refining reduction and heat preservation process using natural gas and carbon powder according to claim 1 is characterized in that: The slag-forming agent is added in an amount of 0.12%-0.25% of the mass of the copper liquid.

5. The copper refining reduction and heat preservation process using natural gas and carbon powder according to claim 4 is characterized in that: The mass ratio of the silicon dioxide material to the calcium oxide-containing material is 1:

2.

6. The copper refining reduction and heat preservation process using natural gas and carbon powder according to claim 1 is characterized in that: The method of delivering the gas to the gas nozzle through the reduction valve group specifically includes the following steps: Open the nitrogen inlet main valve to allow nitrogen to be transported into the copper liquid through the electromagnetic pneumatic valve, the one-way valve and the outlet main valve in sequence; Close the nitrogen inlet main valve and open the natural gas inlet main valve, so that the natural gas can be transported to the copper liquid through the electromagnetic pneumatic valve, flow meter, one-way valve and outlet main valve in sequence.

7. The copper refining reduction and heat preservation process using natural gas and carbon powder according to claim 6 is characterized in that: The flow meter controls the flow rate in the pipeline to be between 300 and 400 m / s. 3 / h; air pressure is controlled within 0.3Mpa-0.5Mpa.

8. The copper refining reduction and heat preservation process using natural gas and carbon powder according to claim 2 is characterized in that: The air nozzle device comprises: A positioning disc (1) having a telescopic rail (11) formed thereon; A rotating disk (2) is rotatably connected to the positioning disk (1), and an arc groove (21) is provided through the rotating disk (2); A telescopic slide rod (3) is slidably connected in the telescopic rail (11), and a gas chamber (32) is formed inside the telescopic slide rod (3). The gas chamber (32) is connected to the restoration valve group. Both ends of the telescopic slide rod (3) are connected to each other and are provided with gas nozzles (4). The gas nozzles (4) form an angle with the axis of the telescopic slide rod (3).

9. The copper refining reduction and heat preservation process using natural gas and carbon powder according to claim 8 is characterized in that: A sliding block (31) is fixedly provided at one end of the telescopic sliding rod (3), and the sliding block (31) is slidably matched with the arc-shaped groove (21), and one of the gas nozzles (4) is fixedly connected to the sliding block (31) and communicated with the gas chamber (32).

10. The copper refining reduction and heat preservation process using natural gas and carbon powder according to claim 9, characterized in that: A plurality of the telescopic rails (11) are provided, and the plurality of the telescopic rails (11) are distributed in an array along the circumference of the positioning disc (1), and each of the telescopic rails (11) corresponds to a telescopic sliding rod (3).

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