A biomass carbon addition device for a copper smelting flash smelting furnace

Abstract

The utility model discloses a kind of biomass carbon adding devices for copper smelting flash smelting furnace, including hollow steel pipe, steel pipe inside fills biomass carbon, two ends are respectively sealing end;Sealing end side is equipped with several small holes, end portion is also connected with the steel plate for sealing;The small hole is communicated with steel pipe inside.The utility model uses high-temperature-resistant alloy steel pipe to package biomass carbon, using the density and structural advantage of steel pipe, it is carried to high-temperature area in lower part of molten pool, effectively avoid the combustion waste caused by that biomass carbon floats on surface due to low density;Through the controllable melting of small hole and sealing steel plate distributed in sealing end, the slow-release and multi-point uniform discharge of biomass carbon are realized, significantly improve its efficiency of participating in reduction reaction, enhance the regulation and control ability to molten pool frozen layer, improve slag-copper separation effect.

Description

Technical Field

[0001] This utility model relates to the field of feeding technology for copper flash smelting furnaces, specifically to a biomass carbon addition device for copper smelting flash smelting furnaces. Background Technology

[0002] In copper smelting, flash smelting furnaces are widely used due to their high efficiency and energy saving. The slag-copper separation effect directly impacts the efficiency of the smelting process and product quality. When difficulties arise in smelting, adding a reducing agent to the furnace to reduce the frozen layer in the molten pool is a common solution. Traditionally, pig iron is often used as the reducing agent. However, in recent years, due to considerations of low-carbon environmental protection and sustainable resource utilization, biomass carbon, as a green and renewable carbon source, has gradually gained attention. However, due to its low density (far lower than that of copper slag and matte), biomass carbon easily floats on the surface of the molten pool when directly added to a flash smelting furnace, making it difficult to effectively penetrate the high-temperature melt. This results in insufficient reduction, reducing the utilization rate of biomass carbon and potentially causing flue gas disturbance due to incomplete combustion, affecting the stability of the furnace's thermal regime. Furthermore, floating biomass carbon is prone to gasification and combustion under high-temperature radiation, causing heat loss and carbon resource waste, and cannot effectively participate in the reduction reaction inside the molten pool, thus hindering effective control of the frozen layer and improvement of slag-copper separation. Existing feeding devices are mostly designed for high-density or highly fluid materials such as pulverized coal and concentrate, lacking a targeted conveying and infiltration mechanism for low-density biomass carbon, which limits their practical industrial applications. Therefore, there is a need to develop an feeding device that can efficiently, stably, and controllably convey biomass carbon to specific areas inside the molten pool. Summary of the Invention

[0003] To address the shortcomings of existing devices that cannot effectively deliver low-density biomass carbon into the molten pool, resulting in floating waste and poor reduction effect, this utility model provides a biomass carbon addition device that can accurately deliver biomass carbon into the high-temperature interior of the molten pool, is easy to use, and can improve the reduction effect.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A biomass carbon addition device for a copper smelting flash furnace includes a hollow steel pipe filled with biomass carbon, with both ends being sealed ends; several small holes are provided next to the sealed ends, and a sealing steel plate is connected to the end; the small holes communicate with the inside of the steel pipe.

[0005] Biomass char is tightly packed into the inside of a steel pipe, and then both ends are sealed with steel plates to form a biomass char addition device that combines biomass char and steel pipe. The device is then placed into the molten pool through the furnace opening of the flash smelting furnace. Under the high-temperature environment of the molten pool, the steel pipe is rapidly heated, softened, and melted. At the same time, the moisture contained in the biomass char evaporates due to the heat, and the generated gas is discharged in an orderly manner through small holes distributed on the pipe wall at the sealed end, effectively preventing bursting. As the steel pipe structure is gradually destroyed, the biomass char is released uniformly through multiple points through the small holes and directly enters the high-temperature reaction zone in the lower part of the molten pool, avoiding the problem of floating on the surface of the melt due to low density. This allows the biomass char to fully participate in the reduction reaction, effectively reducing the thickness of the frozen layer in the molten pool. After a period of smelting, the product is tested. The results show that the slag-copper separation effect is significantly improved, the copper matte and slag are clearly separated, the copper recovery rate is increased, and both smelting efficiency and product quality are improved.

[0006] Furthermore, the steel pipe is a cylindrical alloy steel with a length of 500mm-600mm, a radius of 100mm-110mm, a hollow portion radius of 72mm-74.7mm, and a wall thickness of 28mm-25.3mm. This size steel pipe, filled with biomass char, is dropped into the molten pool from the furnace opening. Its large size and thick-walled structure provide sufficient weight, allowing it to sink quickly to the lower part of the molten pool. Simultaneously, the thick wall provides good thermal resistance and structural strength, delaying melting time and ensuring that the steel pipe is gradually eroded only after penetrating the reaction zone. By adjusting the size of the steel pipe, the loading capacity, sinking ability, and release controllability can be adjusted.

[0007] Furthermore, the steel pipe has several gas passage pipes within its wall, each with several connecting holes on its inner side. The ends of these connecting holes connect to the hollow inner cavity of the steel pipe, and both ends are connected to small holes. The inner side of the gas passage pipe connects to the hollow inner cavity of the steel pipe through the connecting holes, while the outer side connects to the molten pool through the small hole at the sealing end. This allows volatile gases generated by the thermal decomposition of biomass carbon to be discharged smoothly and directionally through the gas passage pipes during the heating process of the steel pipe immersed in the molten pool, preventing gas from accumulating locally on the pipe wall and causing the steel pipe to burst or release out of control. At the same time, the gas passage pipes serve as heat transfer channels between the internal gas and the external melt, accelerating heat transfer into the pipe and promoting the preheating and orderly decomposition of biomass carbon. Combined with the slow-release characteristics of the thick-walled steel pipe, this achieves a more stable and continuous release of carbon materials. In addition, molten metal or slag can seep in through the small holes and gas passage pipes in the reverse direction, accelerating the uniform destruction of the steel pipe structure, preventing blockage at the sealing end, and improving the reliability of the release.

[0008] Furthermore, the biomass char is compressed sawdust or straw char. Using compressed sawdust or straw char increases density and strength, increases the amount of material filling the steel pipe, reduces pulverization, makes the release of biomass char in the molten pool more stable, prolongs the reduction time, and improves carbon utilization. At the same time, it is widely available, low-cost, and environmentally friendly, which helps reduce the introduction of impurities and improves slag-copper separation.

[0009] Furthermore, the biomass carbon has a particle size of 8.0mm-12mm and a porosity controlled within the range of 35%-45%, with a packing density of 0.5g / cm³-0.6g / cm³ and a compressive strength ≥1.5MPa. This specification of biomass carbon ensures dense packing and structural stability within the steel pipe, preventing breakage and pulverization during feeding that could clog the gas passage or small holes. The suitable porosity facilitates the orderly discharge of pyrolysis gases through the gas passage, preventing internal pressure buildup, while simultaneously ensuring sufficient exposed carbon surface area to maintain reduction reaction activity.

[0010] Furthermore, the steel pipe and steel plate are connected by welding. This welding connection ensures a reliable seal at the end of the pipe, effectively preventing biomass carbon leakage before it is immersed in the molten pool. Simultaneously, the welded joint possesses sufficient mechanical strength and thermal stability, capable of withstanding thermal shock and molten erosion under high-temperature conditions for a short period, delaying premature detachment of the steel plate, and ensuring that the steel pipe only begins to melt gradually after sinking to the target depth. Combined with small holes and venting pipes, this allows for the controlled release of biomass carbon. The structure is simple, the process is mature, and the connection is robust, making it suitable for mass production and industrial applications.

[0011] Furthermore, the small holes are circular through holes with a single hole diameter of 3.0mm-6.0mm, and the spacing between the small holes is 2-3 times the hole diameter, facilitating the discharge of gases generated by the volatilization of biomass carbon and water inside the steel pipe. The small holes effectively discharge the volatile gases generated by the heated biomass carbon, preventing pressure buildup, while maintaining the structural strength of the sealing end, preventing the melt from penetrating too quickly, ensuring the stable release of biomass carbon in the molten pool, and improving safety and reduction efficiency.

[0012] Compared with the prior art, the present invention has the following advantages and beneficial effects: This invention utilizes high-temperature resistant alloy steel pipes to encapsulate biomass carbon. Leveraging the density and structural advantages of the steel pipes, it carries the biomass carbon to the high-temperature zone in the lower part of the molten pool, effectively preventing combustion waste caused by the biomass carbon floating on the surface due to its low density. Through the controlled melting of small holes distributed at the sealing end and the sealing steel plate, the biomass carbon is slowly released and uniformly discharged at multiple points, significantly improving its efficiency in participating in the reduction reaction, enhancing the control over the frozen layer of the molten pool, and improving the slag-copper separation effect. Simultaneously, the device has a simple structure, is easy to manufacture, and convenient to operate, enabling efficient, stable, and targeted addition of biomass carbon, improving the recovery rate and product quality of copper smelting, and combining energy conservation, environmental protection, and industrial practicality.

[0013] This invention utilizes the dimensions of the steel pipe, such as its length and wall thickness, to achieve deep transport and slow release of biomass carbon. Combined with the design of internal air passages and connecting holes, it ensures the orderly discharge of pyrolysis gases, preventing explosions and improving release stability. The compressed wood chips or straw charcoal has a particle size of 8–12 mm, a porosity of 35%–45%, a packing density of 0.5–0.6 g / cm³, and a compressive strength ≥1.5 MPa, ensuring structural stability and preventing pulverization. The steel pipe and steel plate are welded and sealed, ensuring a firm connection. The small holes, with a diameter of 3.0 mm–6.0 mm and reasonable spacing, ensure smooth exhaust without weakening strength. The resulting structure avoids floating waste, improves carbon utilization and reduction efficiency, and enhances slag-copper separation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the cross-sectional structure of the steel pipe of this utility model.

[0016] Figure 3 This is a longitudinal half-sectional structural diagram of the steel pipe of this utility model.

[0017] Figure 4 This is a schematic diagram illustrating the use of this utility model.

[0018] Attached image labels: Steel pipe-1, small hole-11, biomass carbon-2, steel plate-3, gas passage pipe-4, connecting hole-41. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Example 1: A biomass carbon addition device for a copper smelting flash furnace includes a hollow steel pipe 1, the inside of which is filled with biomass carbon 2, and both ends are sealed ends; several small holes are provided next to the sealed ends, and the ends are also connected to a sealing steel plate 3; the small holes are in communication with the inside of the steel pipe 1.

[0021] Biomass carbon 2 is tightly packed into the steel pipe 1, and then both ends are sealed with steel plates 3 to form a biomass carbon 2 addition device that combines biomass carbon 2 and steel pipe 1. The addition device is then put into the molten pool through the furnace opening of the flash smelting furnace. Under the high temperature environment of the molten pool, the steel pipe 1 is rapidly heated, softened, and melted. At the same time, the moisture contained in the biomass carbon 2 evaporates due to the heat, and the generated gas is discharged in an orderly manner through small holes distributed on the pipe wall at the sealed end, effectively preventing bursting. As the structure of the steel pipe 1 is gradually destroyed, the biomass carbon 2 is released uniformly through multiple points through the small holes and directly enters the high temperature reaction zone in the lower part of the molten pool, avoiding the problem of floating on the surface of the melt due to low density. This allows the biomass carbon 2 to fully participate in the reduction reaction, effectively reducing the thickness of the frozen layer in the molten pool. After a period of smelting, the product is tested. The results show that the slag-copper separation effect is significantly improved, the copper matte and slag are clearly separated, the copper recovery rate is improved, and the smelting efficiency and product quality are both improved.

[0022] Furthermore, the steel pipe 1 is a cylindrical alloy steel with a length of 500mm-600mm, a radius of 100mm-110mm, a hollow portion radius of 72mm-74.7mm, and a wall thickness of 28mm-25.3mm. After being filled with biomass carbon 2, this steel pipe 1 is dropped into the molten pool from the furnace opening. Its large size and thick wall structure give it sufficient weight, allowing it to sink quickly to the lower part of the molten pool. Simultaneously, the thick wall provides good thermal resistance and structural strength, delaying melting time and ensuring that the steel pipe 1 is gradually eroded only after it has penetrated deep into the reaction zone. By adjusting the size of the steel pipe 1, the loading capacity, sinking ability, and release controllability of the steel pipe 1 can be adjusted.

[0023] Example 2: Unlike Example 1, the steel pipe 1 has several gas passage pipes 4 within its wall. Each gas passage pipe 4 has several connecting holes 41 on its inner side. The ends of the connecting holes 41 connect to the hollow inner cavity of the steel pipe 1, and both ends are connected to small holes. The inner side of the gas passage pipe 4 connects to the hollow inner cavity of the steel pipe 1 through the connecting holes 41, and the outer side connects to the molten pool through the small hole at the sealing end. This allows volatile gases generated by the thermal decomposition of biomass carbon 2 during the heating process of the steel pipe 1 in the molten pool to be discharged smoothly and directionally through the gas passage pipes 4, preventing gas accumulation on the pipe wall that could lead to pipe 1 bursting or uncontrolled release. Simultaneously, the gas passage pipes 4 serve as heat transfer channels between the internal gas and the external melt, accelerating heat transfer into the pipe and promoting the preheating and orderly decomposition of biomass carbon 2. Combined with the slow-release characteristics of the thick-walled steel pipe 1, this achieves a more stable and continuous release of carbon materials. Furthermore, molten metal or slag can seep in through the small holes and gas passage pipes 4 in the reverse direction, accelerating the uniform destruction of the steel pipe 1 structure, preventing blockage at the sealing end, and improving release reliability.

[0024] The biomass carbon 2 is compressed wood chips or straw charcoal. Using compressed wood chips or straw charcoal increases density and strength, increases the filling amount in steel pipe 1, reduces pulverization, makes the release of biomass carbon 2 in the molten pool more stable, prolongs the reduction time, and improves carbon utilization. At the same time, it is widely available, low in cost, and environmentally friendly, which helps to reduce the introduction of impurities and improve the slag-copper separation effect.

[0025] The biomass carbon 2 has a particle size of 8.0mm-12mm and a porosity controlled within the range of 35%-45%, with a packing density of 0.5g / cm³-0.6g / cm³ and a compressive strength ≥1.5MPa. This specification of biomass carbon 2 ensures dense packing and structural stability within the steel pipe 1, preventing breakage and pulverization during feeding that could clog the gas passage pipe 4 or small holes. The suitable porosity facilitates the orderly discharge of pyrolysis gases through the gas passage pipe 4, preventing internal pressure buildup, while simultaneously ensuring sufficient exposed carbon surface area to maintain reduction reaction activity.

[0026] The steel pipe 1 and the steel plate 3 are connected by welding. This welding connection ensures a reliable seal at the end of the pipe, effectively preventing biomass carbon 2 leakage before it is immersed in the molten pool. Simultaneously, the welded joint possesses sufficient mechanical strength and thermal stability, capable of withstanding thermal shock and molten erosion under high-temperature conditions for a short period, delaying premature detachment of the steel plate 3. This ensures that the steel pipe 1 only begins to gradually melt after sinking to the target depth. Combined with the small hole and the venting pipe 4, this achieves controlled release of biomass carbon 2. The structure is simple, the process is mature, and the connection is robust, making it suitable for mass production and industrial applications.

[0027] The small holes are circular through holes with a single hole diameter of 3.0mm-6.0mm, and the spacing between the small holes is 2-3 times the hole diameter, facilitating the discharge of gases generated by the evaporation of moisture from the biomass carbon 2 inside the steel pipe 1. The small holes effectively discharge the volatile gases generated by the heating of the biomass carbon 2, preventing pressure buildup, while maintaining the structural strength of the sealing end, preventing the melt from penetrating too quickly, ensuring the stable release of biomass carbon 2 in the molten pool, and improving safety and reduction efficiency.

[0028] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A biomass carbon addition device for a copper smelting flash smelting furnace, characterized by: It includes a hollow steel pipe (1), the inside of which is filled with biomass carbon (2), and both ends are sealed ends; several small holes (11) are provided next to the sealed ends, and the ends are also connected to a sealing steel plate (3); the small holes (11) are connected to the inside of the steel pipe (1).

2. A biomass carbon addition device for a copper smelting flash smelting furnace as claimed in claim 1, characterized in that: The steel pipe (1) is a cylindrical alloy steel with a length of 500mm-600mm, a radius of 100mm-110mm, a hollow part radius of 72mm-74.7mm, and a wall thickness of 28mm-25.3mm.

3. A biomass carbon addition device for a copper smelting flash smelting furnace as claimed in claim 2, characterized in that: The steel pipe (1) has several air passages (4) in its wall. Each air passage (4) has several connecting holes (41) on its inner side. The end of the connecting hole (41) is connected to the hollow inner cavity of the steel pipe (1), and the two ends are connected to small holes (11).

4. The biomass carbon addition device for a copper smelting flash furnace as described in claim 1, characterized in that: The biomass carbon (2) is wood chips or straw charcoal after compression treatment.

5. A biomass carbon addition device for a copper smelting flash smelting furnace as claimed in claim 4, characterized in that: The biomass carbon (2) has a particle size of 8.0 mm-12 mm and a porosity controlled within the range of 35%–45%, a filling density of 0.5 g / cm³-0.6 g / cm³, and a compressive strength ≥1.5 MPa.

6. A biomass carbon addition device for a copper smelting flash smelting furnace as claimed in claim 1, characterized in that: The steel pipe (1) and the steel plate (3) are connected by welding.

7. A biomass carbon addition device for a copper smelting flash smelting furnace as claimed in claim 1, characterized in that: The small hole (11) is a circular through hole with a single hole diameter of 3.0mm-6.0mm. The distance between small holes (11) is 2-3 times the hole diameter, which facilitates the discharge of gas generated by the volatilization of biomass carbon (2) and moisture in the steel pipe (1).

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