Ceramic oxygen lance for small non-ferrous copper side-blown converter

Abstract

The utility model belongs to oxygen lance technical field especially relates to a kind of ceramic oxygen lance for small nonferrous copper side-blown converter, it is characterized in that, including furnace nozzle, connecting sleeve and oxygen pipe, furnace nozzle, connecting sleeve and oxygen pipe are all ceramic parts, flange for being connected with furnace body side wall and connecting pipe for air entering are equipped on connecting sleeve, furnace nozzle is also connected with flange, oxygen pipe is coaxially arranged with furnace nozzle, the air inlet end of oxygen pipe is connected by screw with connecting sleeve;Furnace nozzle is equipped with necking one;The connecting place of furnace nozzle, connecting sleeve and oxygen pipe is equipped with sealing ring.The utility model has the beneficial effects of:with high strength, low density, high temperature resistance and other advantages.Air flow passage uses venturi structure, can realize the pressurization and drainage effect of fluid, can maximumly reduce the adverse effect of fluctuation change of inlet pressure on the concentration of oxygen-enriched air, make combustion effect more stable, improve the safety of production.

Description

Technical Field

[0001] This utility model belongs to the field of oxygen lance technology, and in particular relates to a ceramic oxygen lance for a small non-ferrous copper side-blown furnace. Background Technology

[0002] Side-blown smelting is used in copper-nickel smelting processes to treat matte (metallic sulfides) in non-ferrous metallurgical production. Its main characteristic is that it requires no fuel; the heat generated solely by the oxidation reaction of iron and sulfur in the molten copper provides all the heat output. However, it requires additional oxygen-enriched air to enhance the oxidation reaction. Side-blown smelting is highly adaptable to different raw materials. In recent years, this technology has been applied to the co-processing of primary copper mines, the treatment of non-ferrous metal smelting waste, and the resource recovery and harmless disposal of solid waste. Two commonly used side-blown smelting methods in my country are oxygen-enriched side-blown molten pool smelting and side-blown submerged combustion molten pool smelting.

[0003] Oxygen-enriched side-blown smelting is a highly efficient smelting process independently developed in my country based on the Vanyukov smelting method. This technology improves the thermal efficiency and metal recovery rate of the smelting process by side-blowing oxygen-enriched air. In this process, multi-channel side-blowing lances are installed on the side wall of the smelting furnace, and the lances directly inject oxygen-enriched air and fuel into the molten pool at subsonic speeds. This method does not rely on the heating of the raw materials, but can directly provide heat to the melt through the combustion process, making it suitable for a variety of non-heat-generating materials. Side-blowing allows for rapid immersion of materials in the molten pool and promotes the completion of chemical reactions, effectively improving smelting efficiency and overall metal recovery rate. Operationally, the side-blown smelting process does not require strict raw material pretreatment; the moisture content of the raw materials entering the furnace is low, and they can be directly fed through an automated system, simplifying the material handling process. During the smelting process, operators can precisely control the smelting temperature by adjusting the oxygen and fuel supply of the lances, thereby ensuring operational safety.

[0004] Chinese utility model patent application number 202122560860.9 discloses an oxygen lance for a side-blown furnace and a side-blown furnace equipped with it. The oxygen lance includes a nozzle and an oxygen lance. The nozzle has an air duct running through its front and rear ends, and the rear end of the nozzle is connected to the oxygen lance. The oxygen lance includes a front tube at the front end, a rear tube at the rear end, and a flange at the rear end of the front tube. The front tube and the rear tube are connected, with the front tube extending through the air duct towards the front end of the nozzle, and the flange connected to the rear end of the nozzle. The rear tube includes a first medium channel, a second medium channel, and a tail channel, with a sealing element installed in the tail channel. In existing side-blown furnace oxygen lances, oxygen and air each enter through separate branch pipes. Fluctuations in the intake pressure cause changes in the concentration of oxygen-enriched air, resulting in unstable combustion performance, necessitating further optimization. Utility Model Content

[0005] The purpose of this invention is to provide a ceramic oxygen lance for a small non-ferrous copper side-blown furnace, overcoming the shortcomings of the prior art. It is made of ceramic components and the air flow channel adopts a venturi structure to achieve the functions of fluid pressurization and diversion, minimizing the adverse effects of fluctuations in intake pressure on the concentration of oxygen-enriched air, and making the combustion effect in the furnace more stable.

[0006] To achieve the above objectives, this utility model employs the following technical solution:

[0007] A ceramic oxygen lance for a small non-ferrous copper side-blown furnace includes an in-furnace nozzle, a connecting sleeve, and an oxygen pipe. All three components are ceramic. The connecting sleeve has a flange for connection to the furnace side wall and a connecting pipe for air intake. The in-furnace nozzle is also connected to the flange. The oxygen pipe is coaxially arranged with the in-furnace nozzle, and its inlet end is connected to the connecting sleeve by screws. The in-furnace nozzle has a reduced diameter section, the ratio of the diameter d of which to the diameter D of the upstream in-furnace nozzle is 1:1.3-1.6. A sealing ring is provided at the connection point of the in-furnace nozzle, connecting sleeve, and oxygen pipe.

[0008] Furthermore, a flared opening is formed between the reduced diameter and the outlet, and the ratio of the outer diameter L to d of the flared opening is 1.6-2.5:1.

[0009] Furthermore, the ceramic component is an alumina ceramic or a silicon nitride ceramic component.

[0010] Furthermore, the wall thickness of the ceramic component is 12-25 mm.

[0011] Furthermore, the oxygen pipe is provided with a second diameter reduction, the ratio of the diameter m at the second diameter reduction to the upstream diameter M is 1:1.1-1.3, the ratio of the distance H between the second diameter reduction and the oxygen pipe outlet to the diameter m at the second diameter reduction is 1:0.8-1, and the ratio of the outer diameter N at the outlet end of the oxygen pipe to the diameter m at the second diameter reduction is 1.3-1.8:1.

[0012] Furthermore, the axis of the connecting pipe forms an angle α of 40-50° with the axis of the connecting sleeve.

[0013] Furthermore, the sealing ring is a graphite sealing ring.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1) The components are made of alumina ceramic or silicon nitride ceramic. Alumina ceramic has good conductivity, mechanical strength and high temperature resistance. Silicon nitride ceramic is an inorganic material ceramic that does not shrink during sintering. It has the advantages of high strength, low density and high temperature resistance, which can extend the service life of the oxygen lance.

[0016] 2) The air flow channel adopts a venturi structure, which can realize the pressurization and diversion of fluid. The local low pressure state can minimize the adverse effects of the fluctuation of the intake pressure on the concentration of oxygen-enriched air, making the combustion effect in the furnace more stable and improving the safety of production.

[0017] 3) The prefabricated structure facilitates maintenance of the easily damaged furnace nozzles, reducing maintenance costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0019] Figure 2 yes Figure 1 External three-dimensional view;

[0020] In the diagram: 1-furnace nozzle, 2-connecting sleeve, 3-oxygen pipe, 4-furnace body, 5-flange, 6-connecting pipe, 7-reduction diameter one, 8-reduction diameter two. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the specific embodiments used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of this utility model. For those skilled in the art, other specific embodiments can be obtained based on these specific embodiments without creative effort.

[0023] The components of the present invention described and shown in the specific embodiments herein can be arranged and designed in numerous different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but only to illustrate selected embodiments of the invention.

[0024] See Figure 1-2 This is a schematic diagram of an embodiment of a ceramic oxygen lance for a small non-ferrous copper side-blown furnace according to this utility model. It includes an in-furnace nozzle 1, a connecting sleeve 2, and an oxygen pipe 3. All three components are ceramic parts, specifically alumina ceramic or silicon nitride ceramic. The wall thickness of the ceramic parts is 12-25 mm.

[0025] The connecting sleeve 2 is equipped with a flange 5 for connection to the side wall of the furnace body 4 and a connecting pipe 6 for air inlet. The axis of the connecting pipe 6 forms an angle α of 40-50° with the axis of the connecting sleeve 2. The furnace nozzle 1 is also connected to the flange 5 by bolts. The oxygen pipe 3 is coaxially arranged with the furnace nozzle 1, and the air inlet end of the oxygen pipe 3 is connected to the connecting sleeve 2 by screws. The furnace nozzle 1 is provided with a reduced diameter 7. The ratio of the diameter d at the reduced diameter 7 to the diameter D of the upstream furnace nozzle 1 is 1:1.3-1.6, preferably 1:1.3. A sealing ring is provided at the connection between the furnace nozzle 1, the connecting sleeve 2 and the oxygen pipe 3. The sealing ring is preferably a graphite sealing ring. A flared mouth is formed between the reduced diameter 7 and the outlet. The ratio of the outer diameter L of the flared mouth to d is 1.6-2.5:1, preferably 1.88:1.

[0026] The oxygen pipe 3 has a reduced diameter section 8. The ratio of the diameter m at the reduced diameter section 8 to the upstream diameter M is 1:1.1-1.3, with a preferred value of 1:1.3. The ratio of the distance H between the reduced diameter section 8 and the outlet of the oxygen pipe 3 to the diameter m at the reduced diameter section 8 is 1:0.8-1, with a preferred value of 1:0.8. The ratio of the outer diameter N at the outlet end of the oxygen pipe 3 to the diameter m at the reduced diameter section 8 is 1.3-1.8:1, with a preferred value of 1.8:1.

[0027] In this embodiment, the gas experiences a Venturi effect as it passes through the narrowed cross-sections 7 and 8. This effect manifests as an increase in fluid velocity as the confined flow passes through the narrowed cross-sections, with the velocity inversely proportional to the cross-sectional area. In simpler terms, this effect refers to the creation of low pressure near a high-speed flowing fluid, resulting in adsorption. In this embodiment, high-pressure oxygen is introduced into the side-blown furnace through oxygen pipe 3, while compressed air is introduced through connecting pipe 6. When the compressed air pressure decreases, the high-speed airflow at the oxygen pipe outlet artificially creates a low-pressure zone at the narrowed cross-sections, thus pulling the compressed air out. This prevents pressure fluctuations in the compressed air from affecting the oxygen concentration at the outlet of nozzle 1 in the furnace, ensuring the smooth and safe operation of the copper smelting process.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A ceramic oxygen lance for a small non-ferrous copper side-blown furnace, characterized in that, The system includes an in-furnace nozzle, a connecting sleeve, and an oxygen pipe, all of which are ceramic components. The connecting sleeve has a flange for connecting to the side wall of the furnace body and a connecting pipe for air inlet. The in-furnace nozzle is also connected to the flange. The oxygen pipe is coaxially arranged with the in-furnace nozzle, and the air inlet end of the oxygen pipe is connected to the connecting sleeve by screws. The in-furnace nozzle has a reduced diameter section, and the ratio of the diameter d of the reduced diameter section to the diameter D of the upstream in-furnace nozzle is 1:1.3-1.

6. A sealing ring is provided at the connection between the in-furnace nozzle, the connecting sleeve, and the oxygen pipe.

2. The ceramic oxygen lance for a small non-ferrous copper side-blown furnace according to claim 1, characterized in that, A flared opening is formed between the reduced diameter and the outlet, and the ratio of the outer diameter L to d of the flared opening is 1.6-2.5:

1.

3. The ceramic oxygen lance for a small non-ferrous copper side-blown furnace according to claim 1, characterized in that, The ceramic component is an alumina ceramic or a silicon nitride ceramic component.

4. The ceramic oxygen lance for a small non-ferrous copper side-blown furnace according to claim 3, characterized in that, The wall thickness of the ceramic component is 12-25 mm.

5. A ceramic oxygen lance for a small non-ferrous copper side-blown furnace according to claim 1, characterized in that, The oxygen pipe has a second diameter reduction, the ratio of the diameter m at the second diameter reduction to the upstream diameter M is 1:1.1-1.3, the ratio of the distance H between the second diameter reduction and the oxygen pipe outlet to the diameter m at the second diameter reduction is 1:0.8-1, and the ratio of the outer diameter N at the outlet end of the oxygen pipe to the diameter m at the second diameter reduction is 1.3-1.8:

1.

6. The ceramic oxygen lance for a small non-ferrous copper side-blown furnace according to claim 1, characterized in that, The axis of the connecting pipe forms an angle α of 40-50° with the axis of the connecting sleeve.

7. A ceramic oxygen lance for a small non-ferrous copper side-blown furnace according to claim 1, characterized in that, The sealing ring is a graphite sealing ring.

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