Micro-bubble spray gun and air injection device of anode furnace

Abstract

The utility model discloses a microbubble spray gun and anode furnace air injection device, including air outlet device and air inlet device, the air outlet device includes microbubble spray gun inner layer and microbubble spray gun outer layer sleeved outside the microbubble spray gun inner layer, the inner side of the microbubble spray gun inner layer forms air inlet channel and air inlet device communication, the air inlet channel is communicated with the air inlet device. An inner-outer interlayer is formed between the outer wall of the microbubble spray gun inner layer and the inner wall of the microbubble spray gun outer layer; inner layer small holes are formed in the surface of the microbubble spray gun inner layer, and outer layer small holes are formed in the surface of the microbubble spray gun outer layer. According to the utility model, the utilization rate of a gas reducing agent is improved, the consumption of reducing gas is reduced, and meanwhile, carbon emission is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of smelting, in particular to a micro-bubble spray gun and an anode furnace jet device. Background Art

[0002] During the pyrometallurgical refining stage of blister copper, natural gas is injected into the high-temperature blister copper melt by a spray gun. However, the existing spray gun is generally a spiral air duct. In addition to the vertical momentum, the reducing gas also has a horizontal component velocity, forming a vortex in the melt, making the gas and liquid contact as fully as possible, and enhancing the reduction effect.

[0003] However, since the gas reducing agent is sprayed into the melt in a large amount and concentratedly in a short period of time, the gas flow rate is large, the residence time of the gas in the liquid phase is short, the gas-liquid contact is insufficient and the gas content of the blister copper melt is low.

[0004] The second reason is that the bubble diameter produced by the current anode furnace spray gun is relatively large, and the specific surface area formula S 比 =6 / d, we know that the specific surface area of ​​a single bubble is inversely proportional to its diameter, which will result in a reduction in the overall gas-liquid contact area. It is estimated from experience that only 20% to 30% of the gas reducing agent currently introduced into the melt fully reacts with the oxygen in the melt, while the rest escapes from the liquid surface and continues to burn in the furnace space, resulting in a low utilization rate of the gas reducing agent. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and proposes a micro-bubble spray gun and an anode furnace jet device, which improves the utilization rate of the gas reducing agent, reduces the consumption of reducing gas, and reduces carbon emissions.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A microbubble spray gun comprises an air outlet device and an air inlet device, wherein the air outlet device comprises an inner layer of the microbubble spray gun and an outer layer of the microbubble spray gun sleeved on the outer side of the inner layer of the microbubble spray gun, an air inlet channel is formed on the inner side of the inner layer of the microbubble spray gun and connected to the air inlet device, and an inner and outer interlayer is formed between the outer wall of the inner layer of the microbubble spray gun and the inner wall of the outer layer of the microbubble spray gun; the surface of the inner layer of the microbubble spray gun is provided with inner layer small holes, the surface of the outer layer of the microbubble spray gun is provided with outer layer small holes, and the opening size of the inner layer small holes is larger than the opening size of the outer layer small holes.

[0008] The reducing gas enters from the air inlet channel and passes through the small holes in the inner layer into the inner and outer layers, forming larger bubbles. The larger bubbles eventually pass through the small holes in the outer layer into the anode furnace, forming dense small bubbles. The small bubbles have a large surface area and a slow floating rate, which increases the gas-liquid contact surface and the residence time of the gas, thereby improving the utilization rate of the gas reducing agent, reducing the consumption of reducing gas, and reducing carbon emissions.

[0009] The outer layer of the micro-bubble spray gun and the inner layer of the micro-bubble spray gun are in a closed state, allowing the reducing gas to flow in a predetermined path.

[0010] Preferably, the inner layer of the micro-bubble spray gun is detachably connected to the outer layer of the micro-bubble spray gun.

[0011] The outer layer of the microbubble spray gun was damaged after working for a period of time. By replacing the outer layer of the microbubble spray gun, the needs of subsequent smelting were met.

[0012] Preferably, the inner layer of the micro-bubble spray gun and the outer layer of the micro-bubble spray gun are both tubular, and the inner layer of the micro-bubble spray gun and the outer layer of the micro-bubble spray gun are coaxially arranged.

[0013] The tubular shape is easy to manufacture and has a large surface, so more bubbles can be produced per unit area. At the same time, the two are arranged coaxially, which can keep the inner and outer layers in a relatively uniform state and can continuously produce uniform and dense bubbles.

[0014] Preferably, a plurality of inner layer small holes are opened on the inner layer surface of the micro bubble spray gun, and the plurality of inner layer small holes are arranged circumferentially around the inner layer surface of the micro bubble spray gun.

[0015] Preferably, a plurality of outer small holes are formed on the outer surface of the microbubble spray gun, and the plurality of outer small holes are circumferentially arranged around the outer surface of the microbubble spray gun.

[0016] Preferably, a mounting seat is fixed to the outer side of the bottom of the outer layer of the micro-bubble spray gun, and is fixed to the bottom of the anode furnace through the mounting seat.

[0017] An anode furnace jet device comprises the above-mentioned microbubble spray gun and a traditional spray gun, wherein the microbubble spray gun and the traditional spray gun are alternately arranged at the bottom of the anode furnace.

[0018] Preferably, the microbubble spray gun and the conventional spray gun are provided in plurality, and the plurality of microbubble spray guns and the conventional spray gun are alternately arranged on the same virtual circular edge line.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The device can generate a large number of microbubbles, which react with oxygen in the copper liquid. The microbubbles have the characteristics of large specific surface area, low floating speed and high internal pressure, so as to increase the gas-liquid contact surface and the residence time of the gas, thereby improving the utilization rate of the gas reducing agent, reducing the consumption of reducing gas and reducing carbon emissions.

[0021] Combining the microbubble spray gun with the traditional spray gun can help the blister copper melt to be turbulent, so that the bubbles coming out of the microbubble spray gun are evenly dispersed, further improving the utilization rate of reducing gas and reducing gas consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0023] Figure 2 It is a cross-sectional structural schematic diagram of the utility model.

[0024] Figure 3 It is a schematic diagram of the planar structure of the inner layer of the micro-bubble spray gun of the utility model.

[0025] Figure 4 It is a schematic diagram of the planar structure of the outer layer of the micro-bubble spray gun of the utility model.

[0026] In the figure: 100, mounting seat; 200, outer layer of microbubble spray gun; 201, small holes in outer layer; 300, inner layer of microbubble spray gun; 301, small holes in inner layer; 310, air inlet channel; 400, inner and outer layers. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation of the utility model is described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific implementation disclosed below.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0029] Pyrometallurgical copper smelting technology is the current mainstream copper smelting process. Its copper smelting process mainly includes smelting, blowing, pyrometallurgical refining and electrolytic refining. The crude copper in the blowing process needs to be put into the anode furnace at a high temperature of 1200℃. Based on the principle that the affinity of copper for oxygen is less than that of impurities for oxygen, the lead, zinc, nickel, arsenic, antimony and other metals in the crude copper are removed in the form of oxides by slag. The Cu generated in the oxidation process is then oxidized by reducing gas. 2O reduction, in which the gas is ejected through the spray gun at the bottom of the anode furnace to generate a high-speed airflow that fully mixes and reacts with the copper melt, and then is poured and cooled to obtain an anode plate with a copper content of more than 99.95%.

[0030] During the pyrometallurgical refining stage of blister copper, natural gas is injected into the high-temperature blister copper melt by a spray gun. However, the existing spray gun is generally a spiral air duct. In addition to the vertical momentum, the reducing gas also has a horizontal component velocity, forming a vortex in the melt, making the gas and liquid contact as fully as possible, and enhancing the reduction effect.

[0031] However, since the gas reducing agent is sprayed into the melt in a large amount and concentratedly in a short period of time, the gas flow rate is large, the residence time of the gas in the liquid phase is short, the gas-liquid contact is insufficient and the gas content of the blister copper melt is low.

[0032] The second reason is that the bubble diameter produced by the current anode furnace spray gun is relatively large, and the specific surface area formula S 比 =6 / d, we know that the specific surface area of ​​a single bubble is inversely proportional to its diameter, which will result in a reduction in the overall gas-liquid contact area. It is estimated from experience that only 20% to 30% of the gas reducing agent currently introduced into the melt fully reacts with the oxygen in the melt, while the rest escapes from the liquid surface and continues to burn in the furnace space, resulting in a low utilization rate of the gas reducing agent.

[0033] The utility model is based on microfluidic technology, adds a microporous aeration head to the anode furnace spray gun, utilizes the microbubbles generated by the device to react with oxygen in the copper liquid, and fully utilizes the characteristics of the microbubbles such as large specific surface area, low floating speed, and high internal pressure to increase the gas-liquid contact surface and the residence time of the gas, thereby improving the utilization rate of the gas reducing agent, reducing the consumption of reducing gas, and reducing carbon emissions.

[0034] See attached Figure 1 -Attached Figure 4 This scheme consists of three parts: air intake system, reaction system and air shut-off system.

[0035] The air intake system is mainly composed of a natural gas intake pipeline, a microbubble spray gun, and a traditional spray gun. Natural gas enters the microbubble generator from the intake pipeline, and then the gas enters the inner layer of the microbubble generator to generate bubbles with a diameter of about 40mm, and then the outer small holes generate microbubbles with a diameter of 0-5mm. The traditional spray gun is opened at a fixed time to accelerate the turbulence inside the melt, so that the bubbles generated by the microbubble spray gun are fully mixed with the crude copper melt.

[0036] The reaction system mainly includes the opening of the traditional spray gun and the opening of the microbubble spray gun. The high-pressure gas first enters the inner layer of the microbubble spray gun, and is dispersed through the small holes in the inner layer to obtain bubbles of about 40 mm. These bubbles then pass through the outermost high-temperature resistant silicon carbide ceramic membrane. The pore size of the ceramic membrane is less than 1 mm, and the bubbles generated are between 0-5 mm. The bubble diameter is small, the speed is small, and the specific surface area is large. The generated bubbles enter the crude copper melt.

[0037] It should be noted here that there are both melt and bubbles between the inner and outer layers. After passing through the large pores of the inner layer, large bubbles of macroscopic scale will be formed, and then the micropores (0.1mm-1mm) of the outer layer will break the macro bubbles to form a large number of micro bubbles; even if some bubbles are merged and their diameters increase, they can still form micro bubbles through the micropores.

[0038] Then open the traditional spray gun, whose aperture is about 30mm, and the bubble size generated is more than 100mm, with a high speed and generally equipped with a swirl structure, which helps the blister copper melt to turbulently disperse the bubbles from the microbubble spray gun. After combining the traditional spray gun with the microbubble spray gun, the microbubbles are evenly mixed with the blister copper melt and fully react with the free oxygen in the blister copper melt. In addition, the specific surface area of ​​a single microbubble is larger than that of the previous bubble, and the total contact area between gas and liquid also increases accordingly. It can be seen from the terminal velocity calculation formula gd^2(ρl-ρg) / 18μ (where g: gravitational acceleration, d: bubble diameter, ρl: melt density, ρg: reducing gas density, μ: melt viscosity) that the bubble floating speed generated by the microbubble spray gun is only 1 / 400 of that of the traditional spray gun (calculated with a diameter of 5mm). The lower bubble floating speed will increase the residence time of the bubble in the liquid phase, fully contact and reduce with the free oxygen in the blister copper melt, improve the gas reduction rate, and greatly reduce the unit consumption of natural gas.

[0039] It should be noted here that there are a total of four spray guns distributed at the bottom of the anode furnace, two traditional spray guns and two microbubble spray guns, which are arranged alternately. The above arrangement helps to make the crude copper melt turbulent and make the bubbles coming out of the microbubble spray guns evenly dispersed.

[0040] The gas shut-off system consists of traditional spray gun gas shut-off and micro-bubble gas shut-off. When the reduction reaction in the anode furnace is about to end, the micro-bubble spray gun is closed first, and then the traditional spray gun is opened once and quickly closed. When the reduction end point is reached, the pouring stage begins.

[0041] Key points of the utility model

[0042] 1. The low floating speed of microbubbles is fully utilized to greatly increase the residence time of bubbles in the liquid phase.

[0043] 2. The double-layer microbubble generating device has low power loss and is easy to replace when the outer layer device is worn out in the high-temperature melt. Compared with replacing the entire spray gun, its replacement cost is lower. It should be noted that when replacing during maintenance, a threaded pipe section is provided at one end of the outer layer, which is connected to the inner layer through the threaded pipe section.

[0044] 3. The combination of the traditional spray gun and the micro-bubble spray gun enables the micro-bubbles to be fully mixed with the crude copper melt. The intermittent opening of the traditional spray gun does not require the addition of other stirring devices, thus reducing equipment investment.

[0045] Effects of the utility model

[0046] The utility model solves the problem of low natural gas utilization rate in the reduction process, improves the gas content in the blister copper melt, reduces the phenomenon of natural gas being burned and wasted due to insufficient reduction, and significantly improves the reduction efficiency.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A micro-bubble spray gun, comprising an air outlet device and an air inlet device, characterized in that: The air outlet device comprises a microbubble spray gun inner layer (300) and a microbubble spray gun outer layer (200) sleeved on the outer side of the microbubble spray gun inner layer (300); an air inlet channel (310) is formed on the inner side of the microbubble spray gun inner layer (300) and communicated with the air inlet device; an inner and outer interlayer (400) is formed between the outer wall of the microbubble spray gun inner layer (300) and the inner wall of the microbubble spray gun outer layer (200); inner layer small holes (301) are formed on the surface of the microbubble spray gun inner layer (300); outer layer small holes (201) are formed on the surface of the microbubble spray gun outer layer (200); the opening size of the inner layer small holes (301) is larger than the opening size of the outer layer small holes (201).

2. The microbubble spray gun according to claim 1, characterized in that: The micro-bubble spray gun inner layer (300) and the micro-bubble spray gun outer layer (200) are detachably connected.

3. The microbubble spray gun according to claim 1, characterized in that: The micro-bubble spray gun inner layer (300) and the micro-bubble spray gun outer layer (200) are both tubular, and the micro-bubble spray gun inner layer (300) and the micro-bubble spray gun outer layer (200) are coaxially arranged.

4. The microbubble spray gun according to claim 3, characterized in that: The surface of the inner layer (300) of the micro-bubble spray gun is provided with a plurality of inner layer small holes (301), and the plurality of inner layer small holes (301) are arranged circumferentially around the surface of the inner layer (300) of the micro-bubble spray gun.

5. The microbubble spray gun according to claim 3, characterized in that: The surface of the outer layer (200) of the micro-bubble spray gun is provided with a plurality of outer layer small holes (201), and the plurality of outer layer small holes (201) are arranged circumferentially around the surface of the outer layer (200) of the micro-bubble spray gun.

6. The microbubble spray gun according to claim 1, characterized in that: A mounting seat (100) is fixed to the outer side of the bottom of the outer layer (200) of the micro-bubble spray gun.

7. An anode furnace gas injection device, characterized in that: It comprises the microbubble spray gun as described in any one of claims 1 to 6, and also comprises a traditional spray gun, wherein the microbubble spray gun and the traditional spray gun are alternately arranged at the bottom of the anode furnace.

8. The anode furnace gas injection device according to claim 7, characterized in that: The microbubble spray guns and the conventional spray guns are provided in plurality, and the plurality of microbubble spray guns and the conventional spray guns are alternately arranged on the same virtual circular edge line.

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