A continuous copper removal furnace with high efficiency desulfurization and desulfurization process thereof

Abstract

The invention discloses a continuous copper-removing furnace with high-efficiency desulfurization and a desulfurization process thereof. By adding a desulfurization device to the continuous copper-removing furnace, the concentration of sulfur dioxide in the continuous copper-removing furnace and the sulfur dioxide content in the exhaust gas of the continuous copper-removing furnace can be effectively reduced, the continuous copper-removing furnace can be prevented from being shortened in service life due to sulfur dioxide corrosion, and air pollution can be effectively prevented, thereby having high economic and environmental benefits.

Description

Technical Field

[0001] The invention belongs to the field of lead pyrometallurgy refining, and in particular relates to a continuous copper removal furnace with high-efficiency desulfurization and a desulfurization process thereof. Background Art

[0002] The continuous copper removal furnace is an important equipment in the crude lead pyrometallurgical refining process. Its main function is to realize the continuous copper removal of crude lead, so sulfur needs to be added to the furnace continuously. The added sulfur will generate a large amount of sulfur dioxide in the continuous copper removal furnace, which will cause air pollution when the exhaust gas is discharged; at the same time, due to the strong corrosiveness of sulfur dioxide, the service life of the continuous copper removal furnace will be shortened, thus affecting economic benefits and production efficiency. Summary of the invention

[0003] The invention discloses a continuous copper-removing furnace with high-efficiency desulfurization and a desulfurization process thereof, which can effectively reduce the sulfur dioxide concentration in the continuous copper-removing furnace and the sulfur dioxide content in the exhaust gas of the continuous copper-removing furnace, prevent the continuous copper-removing furnace from being shortened due to sulfur dioxide corrosion, and effectively prevent air pollution, thereby having high economic and environmental benefits.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A continuous copper removal furnace with high efficiency desulfurization, the continuous copper removal furnace comprises a copper removal furnace body 1, a lead inlet 2, a slag outlet 3, a sulfiding agent addition inlet 4, and a lead liquid outlet 5 are provided on the copper removal furnace body 1, the side wall of the copper removal furnace body 1 is connected to a plurality of flues 6, and a desulfurization device 8 is installed on the flue 6;

[0006] The specific structure of the desulfurization device 8 is as follows: the bottom of the desulfurizer hopper 801 is connected to the stirring bin 802, the bottom of the stirring bin 802 is connected to the discharge pipe 803, the discharge pipe 803 is connected to the discharge hopper 804, and the bottom of the discharge hopper 804 is connected to the conveying pipe 805; an agitator 806 is arranged in the stirring bin 802, a discharge screw 807 is arranged in the discharge pipe 803, the agitator 806 and the discharge screw 807 are connected to the motor 809 through a linkage 808; one end of the conveying pipe 805 is connected to the flue 6, and the other end is a compressed air interface 810.

[0007] Furthermore, two top observation holes 7 are arranged on the top of the decopperizing furnace body 1 .

[0008] Furthermore, the number of the flues 6 is two, and they are respectively located on both sides of the decoppering furnace body 1 .

[0009] Furthermore, the motor 809 is used in conjunction with a speed reducer to adjust the rotation speed.

[0010] Furthermore, a cleaning port 9 is provided at the bottom of the flue 6 .

[0011] Furthermore, the outlet end of the flue 6 is connected to a filter.

[0012] Furthermore, the feed pipe 803 is integrally formed at the bottom of the mixing chamber 802 .

[0013] The desulfurization agent is added through the above desulfurization device to effectively absorb sulfur dioxide in the flue and the copper removal furnace body. The desulfurization agent is sodium carbonate or sodium bicarbonate.

[0014] Since sodium carbonate or sodium bicarbonate is a solid agent, the desulfurizer is easy to settle in the flue, and it is more concentrated after entering the flue through the desulfurization device, and the contact with the exhaust gas is insufficient, which requires increasing the amount of desulfurizer to achieve a better desulfurization effect. To this end, we added an elastic vibration reflection device inside the flue directly opposite the outlet of the conveying pipe. Through the elastic vibration reflection device, the desulfurizer is ejected upward, which effectively reduces the sedimentation of the desulfurizer; and because the elastic vibration reflection device is in a damping vibration form under the action of the exhaust gas and the desulfurizer conveying gas, the angles of the desulfurizer ejected upward are different, which greatly improves the desulfurization effect, so that the amount of desulfurizer can be effectively reduced.

[0015] The above-mentioned elastic vibration reflection device includes a tongue-shaped plate 61, one end of which is movably connected to a connecting bolt 65, and the connecting bolt 65 is fixed on the inner wall of the flue 6; the bottom of the other end of the tongue-shaped plate 61 is connected to the flue 6 through a bottom spring 62, and a top support rod 63 is arranged at the top of the other end of the tongue-shaped plate 61.

[0016] When the elastic vibration reflection device is working, the tongue-shaped plate forms a damping vibration shape by the bottom spring under the action of the exhaust gas and the desulfurizer conveying gas. At the same time, the setting of the top support rod can effectively prevent the tongue-shaped plate from completely sealing the flue.

[0017] Furthermore, a support block 64 is installed on the top support rod 63 to protect the inner wall of the flue.

[0018] Advantages of the present invention:

[0019] 1. The present invention has a simple structure, reasonable design, and is easy to use. The desulfurizer is added through the desulfurization device to effectively absorb sulfur dioxide in the flue and the furnace body of the copper removal furnace, reduce the concentration of sulfur dioxide in the furnace body and exhaust gas of the copper removal furnace, prevent the continuous copper removal furnace from being corroded by sulfur dioxide and causing the furnace life to be shortened, and effectively prevent air pollution, with high economic and environmental benefits;

[0020] 2. An elastic vibration reflection device is set inside the flue, which forms a damping vibration shape under the action of exhaust gas and desulfurizer conveying gas, so the angles of the desulfurizer ejected upward are different, which greatly improves the desulfurization effect and effectively reduces the amount of desulfurizer used. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the continuous copper removal furnace of the present invention;

[0022] Figure 2 This is a partial enlarged view of the desulfurization device of Example 1 of the present invention;

[0023] Figure 3 This is a partial enlarged view of the desulfurization device of Example 2 of the present invention;

[0024] Figure 4 It is a front view of the elastic vibration reflection device of the present invention;

[0025] In the figure, 1-copper removal furnace body, 2-lead inlet, 3-slag outlet, 4-sulfiding agent addition inlet, 5-lead liquid outlet, 6-flue, 61-tongue-shaped plate, 62-bottom spring, 63-top support rod, 64-support block, 65-connecting bolt, 7-top observation hole, 8-desulfurization device, 801-desulfurization agent hopper, 802-mixing bin, 803-discharging pipe, 804-discharging hopper, 805-conveying pipe, 806-mixer, 807-discharging screw, 808-linker, 809-motor, 810-compressed air interface, 9-cleaning port DETAILED DESCRIPTION

[0026] Example 1

[0027] like Figure 1 As shown, a continuous copper removal furnace with high efficiency desulfurization comprises a copper removal furnace body 1, a lead inlet 2, a slag outlet 3, a sulfiding agent addition inlet 4, and a lead liquid outlet 5 are provided on the copper removal furnace body 1, the side walls of the copper removal furnace body 1 are connected with two flues 6, two top observation holes 7 are arranged on the top of the copper removal furnace body 1, and a desulfurization device 8 is installed on the flue 6;

[0028] The specific structure of the desulfurization device 8 is as follows: the bottom of the desulfurizer hopper 801 is connected to the stirring bin 802, the bottom of the stirring bin 802 is connected to the discharge pipe 803, the discharge pipe 803 is integrally formed at the bottom of the stirring bin 802, the discharge pipe 803 is connected to the discharge hopper 804, and the bottom of the discharge hopper 804 is connected to the conveying pipe 805; an agitator 806 is arranged in the stirring bin 802, a discharge screw 807 is arranged in the discharge pipe 803, the agitator 806 and the discharge screw 807 are connected to the motor 809 through a linkage 808, and the motor 809 is used in conjunction with a reducer to adjust the rotation speed; one end of the conveying pipe 805 is connected to the flue 6, and the other end is a compressed air interface 810; a cleaning port 9 is arranged at the bottom of the flue 6, and the outlet end of the flue 6 is connected to a filter.

[0029] Working principle:

[0030] When the above-mentioned continuous decoppering furnace is working, lead liquid is introduced from the lead inlet, sulfur or other sulfiding agents are introduced from the sulfiding agent addition port, the matte slag is discharged through the scum outlet, and the lead liquid after decoppering is discharged from the lead liquid outlet; desulfurizer is added to the desulfurizer hopper, and the desulfurizer is dispersed by the agitator in the stirring bin to prevent blockage by accumulated materials; the desulfurizer enters the discharge pipe, and enters the discharge hopper through the action of the discharge screw, and then enters the conveying pipe under the action of gravity. The desulfurizer is transported into the flue in the conveying pipe by the connected compressed air to ensure that there is no hidden danger of blockage in the conveying pipe; the desulfurizer is discharged with the exhaust gas and collected by the filter, and a small amount of settled desulfurizer can be cleaned at the cleaning port.

[0031] The test was conducted with a stable and continuously operating copper removal furnace, where the original concentration of sulfur dioxide in the exhaust gas was 479ppm and the exhaust gas flow rate was approximately 45300m 3 / h; adding 48kg of sodium bicarbonate to the exhaust gas every hour can reduce the concentration of sulfur dioxide in the exhaust gas to 253ppm, making it meet the requirement of sulfur dioxide concentration ≤400ppm for direct exhaust gas. After one day of continuous operation, the total amount of solid adhesives cleaned through the cleaning port is 51.75kg.

[0032] Example 2

[0033] On the basis of Example 1, an elastic vibration reflection device is added inside the flue opposite to the outlet of the delivery pipe, which includes a tongue-shaped plate 61, one end of which is movably connected to a connecting bolt 65, and the connecting bolt 65 is fixed to the inner wall of the flue 6; the bottom of the other end of the tongue-shaped plate 61 is connected to the flue 6 through a bottom spring 62, and a top support rod 63 is arranged at the top of the other end of the tongue-shaped plate 61; a support block 64 is installed on the top support rod 63.

[0034] When the elastic vibration reflection device is working, the tongue-shaped plate forms a damping vibration shape by relying on the bottom spring under the action of exhaust gas and desulfurizer conveying gas. At the same time, the setting of the top support rod can effectively prevent the tongue-shaped plate from completely sealing the flue; the setting of the support block can protect the inner wall of the flue.

[0035] The desulfurizer is ejected upward by the elastic vibration reflection device, which effectively reduces the sedimentation of the desulfurizer. Moreover, since the elastic vibration reflection device is in a damping vibration state under the action of the exhaust gas and the desulfurizer conveying gas, the angles at which the desulfurizer is ejected upward are different, which greatly improves the desulfurization effect. In this way, the amount of desulfurizer used can be effectively reduced.

[0036] The same copper removal furnace as in Example 1 was used for the test, wherein the original concentration of sulfur dioxide in the exhaust gas was 485 ppm and the exhaust gas flow rate was about 45600 m 3 / h; adding 31.5kg of sodium bicarbonate to the exhaust gas per hour can reduce the concentration of sulfur dioxide in the exhaust gas to 208ppm. After one day of continuous operation, the total amount of solid adhesives cleaned through the cleaning port is 10.65kg.

[0037] Compared with Example 1, since there is less settled solid binder, the frequency of flue cleaning only needs to be maintained at 1 / 5-1 / 3 of that in Example 1.

[0038] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A continuous copper removal furnace with high efficiency desulfurization, characterized in that: The continuous copper removal furnace comprises a copper removal furnace body, on which a lead inlet, a slag outlet, a sulfiding agent inlet, and a lead liquid outlet are arranged, and the side wall of the copper removal furnace body is connected to a plurality of flues, on which a desulfurization device is installed; The specific structure of the desulfurization device is as follows: the bottom of the desulfurizer hopper is connected to the stirring bin, the bottom of the stirring bin is connected to the feeding pipe, the feeding pipe is connected to the feeding hopper, and the bottom of the feeding hopper is connected to the conveying pipe; an agitator is arranged in the stirring bin, a feeding screw is arranged in the feeding pipe, and the agitator and the feeding screw are connected to the motor through a linkage; one end of the feeding pipe is connected to the flue, and the other end is a compressed air interface; An elastic vibration reflection device is installed inside the flue directly opposite to the delivery pipe outlet, and the elastic vibration reflection device includes a tongue-shaped plate, one end of which is movably connected to a connecting bolt, and the connecting bolt is fixed to the inner wall of the flue; the bottom of the other end of the tongue-shaped plate is connected to the flue through a bottom spring, and a top support rod is arranged on the top of the other end of the tongue-shaped plate.

2. The continuous copper removal furnace according to claim 1, characterized in that: Two top observation holes are arranged on the top of the decoppering furnace body.

3. The continuous copper removal furnace according to claim 1, characterized in that: The number of the flues is two, and they are respectively located on both sides of the decoppering furnace body.

4. The continuous copper removal furnace according to claim 1, characterized in that: The motor is used in conjunction with a speed reducer.

5. The continuous copper removal furnace according to claim 1, characterized in that: A cleaning port is arranged at the bottom of the flue.

6. The continuous copper removal furnace according to claim 1, characterized in that: The outlet end of the flue is connected to a filter.

7. The continuous copper removal furnace according to claim 1, characterized in that: The feed pipe is integrally formed at the bottom of the mixing bin.

8. The continuous copper removal furnace according to claim 1, characterized in that: A support block is installed on the top support rod.

9. A process for desulfurization using the continuous copper removal furnace as claimed in any one of claims 1 to 8, characterized in that: The process specifically comprises: adding a desulfurizing agent into the desulfurizing device to reduce the concentration of sulfur dioxide in the continuous decoppering furnace and the flue; wherein the desulfurizing agent is sodium carbonate or sodium bicarbonate.

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