A compound corundum castable burner for tin smelting fuming copper slag

Abstract

This invention discloses a composite corundum castable burner for use with copper slag in tin smelting. The burner includes a burner tube body, on which a corundum castable layer is cast on the outer wall near its outlet. Multiple anchoring ribs are embedded within the corundum castable layer to prevent it from detaching, and these anchoring ribs are fixedly connected to the outer wall of the burner tube body. This burner utilizes the excellent high-temperature resistance, corrosion resistance, and erosion resistance of corundum to effectively isolate the high-temperature molten metal from the metal matrix, fundamentally solving the problems of intergranular corrosion, embrittlement, and melting caused by eutectic reaction, penetration, and alloying in existing metal burners under tin smelting copper slag conditions. Simultaneously, the embedded anchoring ribs firmly anchor the castable layer to the metal tube body, ensuring that the castable layer is not easily peeled off or detached under high-temperature thermal shock and airflow erosion, significantly extending the overall service life of the burner and ensuring continuous production.

Description

Technical Field

[0001] This invention relates to the field of burner technology for tin-copper symbiotic ore smelting equipment, and more specifically to a composite corundum castable burner for tin smelting fuming copper slag. Background Technology

[0002] In tin smelting, the use of a fumigation furnace to volatilize high-tin copper slag to separate and recover tin and copper has become a widely used and effective advanced technology. This process requires the fumigation furnace to operate at extreme temperatures ranging from 1200℃ to 1400℃, containing complex gaseous components such as CO, O2, SO2, tin vapor, and SnS, as well as active elements like Sn, Cu, and S in the melt. This multiphase coexistence and highly reactive high-temperature environment poses extremely stringent challenges to the burner materials of the fumigation furnace, particularly in terms of high-temperature chemical corrosion and material compatibility.

[0003] Currently, fuming furnace burners are generally manufactured as a single piece using heat-resistant stainless steel such as 310S and 2520. However, when processing high-tin copper slag, these metal burners exhibit a series of fatal defects, severely restricting the continuity and stability of production:

[0004] 1. Severe high-temperature chemical corrosion and poor material compatibility: At high temperatures, components such as tin, copper, and sulfur readily undergo eutectic reactions, penetration, and alloying with the heat-resistant steel matrix, leading to intergranular corrosion, material embrittlement, surface peeling, and even melting, resulting in rapid deterioration of the burner structure. Simultaneously, as the flame outlet, the burner is exposed to a high-temperature oxidizing atmosphere for extended periods, causing severe oxidation and burning of the metal matrix, further shortening its service life.

[0005] 2. Insufficient heat resistance, prone to high-temperature deformation: The high-temperature creep limit of existing heat-resistant stainless steel is insufficient to meet the requirements of long-term over-temperature service. Burners are prone to creep, collapse, or even burn-through, leading to uncontrolled flame morphology and directly affecting the efficiency and process stability of copper slag fumigation treatment.

[0006] 3. Poor erosion resistance and high wear rate: The high-speed slag-laden airflow inside the furnace continuously washes over the burner head, causing localized rapid thinning, gaps, and uneven burning, which seriously affects the uniformity of flame distribution and combustion effect.

[0007] 4. High sensitivity to thermal fatigue, requiring frequent maintenance and replacement: Under frequent start-stop conditions, the burner is subjected to severe thermal cycling stress, making it prone to thermal fatigue cracks and even localized detachment. In practical applications, the average service life of metal burners is less than one day, greatly increasing maintenance costs and the risk of production downtime.

[0008] In addition, although pure ceramic materials have certain high temperature resistance, they are brittle, have poor thermal shock resistance and impact resistance, are easily broken during installation, and are prone to react with slag and become slag-like. They are also difficult to adapt to the complex working conditions of high tin copper slag fumigation.

[0009] In summary, neither existing metal nor ceramic burners can effectively meet the long-term stable operation requirements of high-tin copper slag fumigation furnaces. Therefore, solving the core problems such as poor compatibility of metal burners and severe high-temperature chemical corrosion in the high-tin copper slag fumigation environment has become a critical technical bottleneck that the tin smelting industry urgently needs to overcome. Summary of the Invention

[0010] In view of this, the present invention provides a composite corundum castable burner for tin smelting and copper slag fumigation, to solve the problems of poor high-temperature chemical compatibility and severe corrosion of traditional metal burners with tin, copper and sulfur during high-tin copper slag fumigation, and to overcome the defects of heat-resistant steel such as ablation, rapid erosion and short service life, and pure ceramic such as easy breakage and slag formation.

[0011] To achieve the above objectives, the present invention adopts the following technical solution: A composite corundum castable burner for tin smelting copper slag fuming includes: a burner tube body, wherein a corundum castable layer is cast on the outer wall of the burner tube body near its outlet, and a plurality of anchoring ribs are pre-embedded in the corundum castable layer to prevent the corundum castable layer from falling off, and the anchoring ribs are fixedly connected to the outer wall of the burner tube body.

[0012] Furthermore, the anchoring rib is a V-shaped rib, the tip of which is fixed to the outer wall of the burner tube body, and the two wings of the V-shaped rib open outward and are embedded in the corundum casting material layer.

[0013] Furthermore, the burner tube body includes: A coal-air mixing pipe, one end of which is fixed with a mounting flange for connection to a furnace body mixer; A variable diameter ring is fixedly connected to the other end of the air-coal mixing pipe, and the diameter of the ring opening of the variable diameter ring is smaller than the pipe diameter of the air-coal mixing pipe. The nozzle tube has one end fixedly connected to the inner wall of the variable diameter ring, and multiple anchoring ribs are fixedly connected to the outer wall of the nozzle tube. The corundum casting material layer is cast onto the outer wall of the nozzle tube.

[0014] Furthermore, a protective mold is provided on the outer sleeve of the nozzle pipe, one end of the protective mold is fixedly connected to the outer wall of the other end of the air-coal mixing pipe, and a casting cavity is formed between the protective mold and the nozzle pipe, and the corundum casting material layer is cast in the casting cavity.

[0015] Furthermore, one end of the protective tube mold is welded or threaded to the outer wall of the other end of the air-coal mixing pipe.

[0016] Furthermore, the mounting flange, the air-coal mixing pipe, the reducing ring, and the nozzle pipe are all made of 310S stainless steel.

[0017] Furthermore, the mounting flange is welded and fixed to one end of the air-coal mixing pipe.

[0018] Furthermore, the variable diameter ring is welded and fixed to the other end of the air-coal mixing pipe.

[0019] Furthermore, one end of the nozzle tube is welded and fixed to the inner wall of the annulus of the variable diameter ring.

[0020] Furthermore, the anchoring rib is welded and fixed to the outer wall of the nozzle tube.

[0021] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a composite corundum castable burner for tin smelting fuming copper slag, which has the following effects: By adopting a composite structure design of corundum castable layer and metal tube, and utilizing the excellent high-temperature resistance, chemical corrosion resistance and erosion resistance of corundum material, the metal matrix of the burner outlet section is effectively isolated from corrosive melts such as high-temperature tin, copper, and sulfur. This fundamentally solves the serious failure problems of fuming furnace burners under high tin-copper slag conditions of 1200℃~1400℃, such as intergranular corrosion, embrittlement, peeling and melting caused by eutectic reaction, penetration and alloying. This significantly improves the burner head's resistance to high-temperature ablation and slag gas flow erosion. At the same time, by pre-embedding V-shaped anchoring ribs to firmly anchor the castable layer and burner tube, and in conjunction with the protective tube mold to form a standardized casting cavity structure, the structural integrity and anti-stripping ability of the composite layer under severe thermal cycling impact and high-speed airflow vibration are ensured, effectively overcoming the inherent defects of pure ceramic burners, such as high brittleness, easy breakage and easy slag formation.

[0022] The average service life of the burner in this application is extended from less than one day for existing metal burners to several weeks or even months, which greatly reduces the frequency of furnace shutdowns for burner replacement and maintenance costs, significantly improves the production continuity and economic benefits of the tin smelting copper slag fumigation process, and provides a long-life, highly reliable burner solution for the fumigation treatment of high-tin copper slag. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This invention provides a structural schematic diagram of a composite corundum castable burner for use with copper slag from tin smelting.

[0025] Figure 2 This invention provides an exploded structural diagram of a composite corundum castable burner for use with copper slag from tin smelting. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] like Figures 1-2As shown, this embodiment of the invention discloses a composite corundum castable burner for tin smelting copper slag fumigation, comprising: a burner tube body 1, a corundum castable layer 2 cast on the outer side of the tube wall near its outlet, and a plurality of anchoring ribs 3 pre-embedded in the corundum castable layer 2 to prevent the corundum castable layer 2 from falling off, the anchoring ribs 3 being fixedly connected to the outer wall of the burner tube body 1.

[0031] Corundum castables, with α-Al₂O₃ as the main crystalline phase, belong to high-temperature industrial high-performance monolithic refractory materials, possessing advantages such as high temperature resistance, ultra-wear resistance, corrosion resistance, and high strength. (1) Extremely high refractoriness and strong high-temperature stability: Long-term operating temperature: 1400~1600℃; Refractoriness: ≥1790℃ It exhibits low high-temperature creep and is not easily deformed, softened, or collapsed under load; (2) High wear resistance: Corundum has a Mohs hardness of 9 (second only to diamond). The wear at room temperature is ≤5 cm³, which is far superior to ordinary high-alumina materials; It has extremely strong resistance to dust, high-speed airflow, and copper slag particle erosion. (3) Extremely high mechanical strength: Compressive strength at room temperature: 80~120 MPa; Hot compressive strength at 1000℃: ≥70 MPa; It has excellent resistance to bending, impact, and vibration.

[0032] This application discloses a burner that utilizes corundum castable layer cast in the critical high-temperature region near the outlet of the burner tube body. Leveraging the excellent high-temperature resistance, corrosion resistance, and erosion resistance of corundum, the high-temperature molten metal is effectively isolated from the metal matrix. This fundamentally solves the problems of intergranular corrosion, embrittlement, and melting caused by eutectic reaction, penetration, and alloying in existing metal burners operating under tin smelting and copper slag fumigation conditions. Simultaneously, pre-embedded anchoring ribs firmly anchor the castable layer to the metal tube body, ensuring that the castable layer is not easily peeled off or detached under high-temperature thermal shock and airflow erosion, significantly extending the overall service life of the burner and ensuring continuous production.

[0033] In addition, 1% to 3% stainless steel fibers can be added to the corundum castable layer 2. This can significantly improve the toughness and thermal shock resistance of the castable layer by forming a three-dimensional randomly distributed reinforcing network inside the castable through the steel fibers, while maintaining the excellent high temperature resistance and chemical corrosion resistance of the corundum material. This effectively prevents and inhibits crack propagation, thereby greatly reducing the risk of cracking and spalling of the burner under frequent start-stop thermal cycle conditions. At the same time, the high strength and high elastic modulus of the steel fibers can effectively absorb the impact energy of high-speed slag-containing gas flow, enhance the erosion resistance and wear resistance of the castable layer, and further improve the durability of the burner head under harsh gas flow conditions.

[0034] In a preferred embodiment, the anchoring rib 3 is a V-shaped rib, with the tip of the V-shaped rib fixed to the outer wall of the burner tube body 1, and the two wings of the V-shaped rib opening outward and embedded inside the corundum castable layer 2. This V-shaped anchoring rib structure increases the contact area and interlocking force between the anchoring rib and the corundum castable layer, forming a mechanical interlock and further improving the anti-stripping ability of the castable layer.

[0035] In some embodiments, the burner tube body 1 includes: Air-coal mixing pipe 11, one end of which is fixed with a mounting flange 12 for connection to the furnace body mixer; A variable diameter ring 13 is fixedly connected to the other end of the air-coal mixing pipe 11, and the diameter of the ring opening of the variable diameter ring 13 is smaller than the pipe diameter of the air-coal mixing pipe 11. The nozzle tube 14 has one end fixedly connected to the inner wall of the annulus of the reducing ring 13. Multiple anchoring ribs 3 are fixedly connected to the outer wall of the nozzle tube 14. The corundum casting material layer 2 is cast on the outer wall of the nozzle tube 14.

[0036] In this embodiment, the burner tube body adopts a segmented structure. The air-coal mixing tube is used to achieve full mixing and transportation of air and pulverized coal; the setting of the variable diameter ring causes the channel cross-section to suddenly narrow, which has an acceleration and rectification effect on the gas-solid two-phase flow, ensuring that the flame is ejected at a high speed, improving combustion efficiency and flame rigidity; the nozzle tube, as the flame outlet section, has specially set anchoring ribs on its outer wall for casting a corundum layer, making the most demanding area of ​​the high-temperature burner outlet a key protection area, and specifically solving the most serious ablation, corrosion and erosion problems in this area.

[0037] In a preferred embodiment, a protective mold 15 is provided over the nozzle pipe 14. One end of the protective mold 15 is fixedly connected to the outer wall of the other end of the air-coal mixing pipe 11. A casting cavity 101 is formed between the protective mold 15 and the nozzle pipe 14, and the corundum casting material layer 2 is cast into the casting cavity 101.

[0038] By setting up a protective mold, a closed annular casting cavity is formed outside the nozzle tube, providing a standardized mold space for the formation of the corundum castable layer and facilitating the casting operation. Simultaneously, after the castable has cured, the protective mold acts as an outer protective sleeve, providing secondary physical protection to the castable layer, further resisting the direct scouring and mechanical impact of high-speed slag-laden airflow, thus improving the overall strength and impact resistance of the burner head structure.

[0039] One end of the protective pipe mold 15 is welded or threaded to the outer wall of the other end of the air-coal mixing pipe 11.

[0040] Welded fixing offers reliable and well-sealed connections, suitable for permanent installations that do not require disassembly; threaded fixing facilitates disassembly and replacement, making it convenient for later inspection, repair, or complete replacement of the protective mold for the corundum castable layer. Both methods provide flexible structural design options, allowing for selection based on actual working conditions and maintenance needs, thus enhancing the ease of burner manufacturing and maintenance.

[0041] Of course, in actual use, the protective mold 15 can also be removed from the burner, and only the corundum casting material layer 2 is used to protect the burner.

[0042] The mounting flange 12, air-coal mixing pipe 11, reducing ring 13, and nozzle pipe 14 are all made of 310S stainless steel.

[0043] The main metal components of the burner are all made of 310S (equivalent to 2520) heat-resistant stainless steel. 310S stainless steel has excellent high-temperature oxidation resistance and high-temperature strength. As the structural support skeleton of the burner, it can ensure that the burner as a whole has sufficient structural rigidity and dimensional stability at extreme high temperatures of 1200℃~1400℃, and is not prone to creep and collapse.

[0044] The mounting flange 12 is welded and fixed to one end of the air-coal mixing pipe 11.

[0045] The reducing ring 13 is welded and fixed to the other end of the air-coal mixing pipe 11.

[0046] One end of the nozzle tube 14 is welded and fixed to the inner wall of the annular opening of the reducing ring 13.

[0047] Anchor bars 3 are welded and fixed to the outer wall of nozzle pipe 14. This welding connection ensures a high-strength metallurgical bond between the anchor bars and the outer wall of the nozzle pipe at high temperatures. This bond can withstand the thermal and mechanical stresses generated during thermal cycling of the castable layer, preventing the entire castable layer from peeling off due to loosening or detachment of the anchor bars. This connection method is simple and reliable, and is a key technical means to ensure the long-term effective anchoring function of the anchors, indirectly guaranteeing the service life of the corundum castable layer.

[0048] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0049] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A combined corundum castable burner for tin smelting fuming copper slag, characterized in that, include: The burner tube body (1) has a corundum casting material layer (2) cast on the outer side of the tube wall near its outlet. Multiple anchoring ribs (3) are pre-embedded in the corundum casting material layer (2) to prevent the corundum casting material layer (2) from falling off. The anchoring ribs (3) are fixedly connected to the outer wall of the burner tube body (1).

2. A combined corundum castable burner for tin smelting fuming copper slag according to claim 1, characterized in that, The anchoring bar (3) is a V-shaped bar. The tip of the V-shaped bar is fixed on the outer wall of the burner tube body (1). The two wings of the V-shaped bar open outward and are embedded in the corundum casting material layer (2).

3. The combined corundum castable burner for smelting fuming copper slag of tin according to claim 1 or 2, characterized in that, The burner tube body (1) includes: A coal-air mixing pipe (11) is provided with a mounting flange (12) at one end for connection to the furnace body mixer. A variable diameter ring (13) is fixedly connected to the other end of the air-coal mixing pipe (11), and the diameter of the ring opening of the variable diameter ring (13) is smaller than the pipe diameter of the air-coal mixing pipe (11). The nozzle tube (14) has one end fixedly connected to the inner wall of the annulus of the variable diameter ring (13), and multiple anchoring ribs (3) are fixedly connected to the outer wall of the nozzle tube (14). The corundum casting material layer (2) is cast on the outer wall of the nozzle tube (14).

4. The combined corundum castable burner for tin smelting fuming copper slag according to claim 3, characterized in that, The nozzle pipe (14) is fitted with a protective pipe mold (15). One end of the protective pipe mold (15) is fixedly connected to the outer wall of the other end of the air-coal mixing pipe (11). A casting cavity (101) is formed between the protective pipe mold (15) and the nozzle pipe (14). The corundum casting material layer (2) is cast in the casting cavity (101).

5. The combined corundum castable burner for fuming copper slag in tin smelting according to claim 4, characterized in that, One end of the protective pipe mold (15) is welded or threaded to the outer wall of the other end of the air-coal mixing pipe (11).

6. A combined corundum castable burner for tin smelting fuming copper slag according to claim 4, characterized in that, The mounting flange (12), the air-coal mixing pipe (11), the reducing ring (13), and the nozzle pipe (14) are all made of 310S stainless steel.

7. A combined corundum castable burner for fuming copper slag in tin smelting according to claim 3, characterized in that, The mounting flange (12) is welded and fixed to one end of the air-coal mixing pipe (11).

8. A combined corundum castable burner for tin smelting fuming copper slag according to claim 3, characterized in that, The variable diameter ring (13) is welded and fixed to the other end of the air-coal mixing pipe (11).

9. A composite corundum castable burner for tin smelting and copper slag fumigation according to claim 3, characterized in that, One end of the nozzle tube (14) is welded and fixed to the inner wall of the annulus of the variable diameter ring (13).

10. A combined corundum castable burner for smelting fuming copper slag of tin according to claim 3, characterized in that, The anchor bar (3) is welded and fixed to the outer wall of the nozzle pipe (14).

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