A primary lead concentrate utilizes side-blown reduction furnace and pulverized coal injection metering device

Abstract

The application discloses a kind of primary lead concentrate utilizes side-blown reduction furnace and coal powder injection metering device, including reduction furnace and coal powder injection metering device;The discharge end of the coal powder injection metering device is connected with the top end of reduction furnace for blowing coal powder into reduction furnace;Multiple side blowing nozzles are installed from top to bottom in the reduction furnace, and the top of the reduction furnace is provided with a smoke pipe, further comprising a gas supply mechanism for providing protective nitrogen to the side blowing nozzle;And the gas supply mechanism is connected with the gas guide pipe and the lateral blowing nozzle, and a heat exchange mechanism is provided between the gas guide pipe and the smoke pipe, which is used to heat the gas in the gas guide pipe;The side blowing nozzle is arranged on the reduction furnace through a dismounting mechanism;The nitrogen entering the reduction furnace has a relatively high initial temperature, which reduces the heat carried away by the exhaust gas in the reduction furnace, thereby reducing the energy consumption of the reduction furnace.

Description

Technical Field

[0001] This invention relates to the technical field of reduction furnaces, specifically to a side-blown reduction furnace for primary lead concentrate and a coal powder injection metering device. Background Technology

[0002] Compared to solid-solid or gas-solid reduction methods for producing metals from metal oxides, slag bath carbothermic reduction benefits from the solid-liquid reduction of molten metal oxides by solid carbon in the slag and from the large reaction interface of the slag bath, resulting in significantly improved reaction efficiency. Furthermore, because slag bath carbothermic reduction takes place in a molten slag pool, the reaction kinetics are favorable, and liquid metal can be produced in one step. It boasts advantages such as simple process and high reduction rate, and is widely used in the refining of valuable metals from primary metal ores and secondary metallurgical resources. However, the slag bath carbothermic reduction process still has the following problems. The carbothermic reduction reaction of metal oxides is an endothermic reaction, requiring a large amount of heat. Existing carbothermic reduction reactions generate a large amount of high-temperature gas. While existing reduction furnaces send this high-temperature gas to other equipment for waste heat recovery, when gas is introduced into the reduction furnace at room temperature, it carries away heat from the furnace, causing the furnace temperature to gradually decrease. This necessitates reheating to maintain stability, increasing the furnace's energy consumption.

[0003] Most methods of adding pulverized coal to reduction furnaces use injection tank systems. However, due to the high gas velocity and the presence of a large amount of pulverized coal, the coal easily collides with valves and pipes, causing wear and reducing their lifespan. Furthermore, existing injection tank systems control the injection volume by adjusting the gas flow rate. This method is prone to uneven injection volume, clogging of the injection pipes, uneven combustion within the kiln, and operational inconvenience. Therefore, this invention provides a side-blown reduction furnace for primary lead concentrate and a pulverized coal injection metering device. Summary of the Invention

[0004] To address the shortcomings of existing reduction furnaces, which involve sending high-temperature gas into other equipment for waste heat recovery, and the fact that the gas, being at room temperature, carries away heat from the furnace during initial gas flow, causing a gradual temperature drop and requiring reheating to maintain stability, thus increasing energy consumption, this invention provides a side-blown reduction furnace for primary lead concentrate. Furthermore, the high gas velocity and the presence of a large amount of pulverized coal can cause collisions with valves and pipes, leading to wear and reduced valve and pipe lifespan. Existing injection tank systems control the injection volume by adjusting the gas flow rate, which is prone to uneven injection, clogging of the injection pipes, uneven combustion within the kiln, and operational inconvenience.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] This invention discloses a side-blown reduction furnace for primary lead concentrate, comprising a reduction furnace and a pulverized coal injection metering device; the discharge end of the pulverized coal injection metering device is connected to the top of the reduction furnace for blowing pulverized coal into the reduction furnace; multiple side-blown nozzles are installed from top to bottom inside the reduction furnace, and a flue pipe is provided at the top of the reduction furnace; a gas supply mechanism is also included for providing protective nitrogen to the side-blown nozzles; the gas supply mechanism and a gas guide pipe are connected to the side-blown nozzles, and a heat exchange mechanism is provided between the gas guide pipe and the flue pipe for heating the gas in the gas guide pipe; the side-blown nozzles are mounted on the reduction furnace via a disassembly mechanism.

[0007] As a preferred embodiment of the present invention, the side-blowing nozzles are tangentially inclined toward the reduction furnace, and the orientation of the multiple side-blowing nozzles is consistent.

[0008] As a preferred embodiment of the present invention, the disassembly mechanism includes an installation port on the reduction furnace, and the inner side of the installation port is provided with a rim made of a high-temperature resistant ceramic plate; the side-blowing nozzle is provided with an installation block for installation in the installation port, and the installation block is provided with a stepped sealing step, the inside of the rim is provided with a sealing groove that cooperates with the stepped sealing step, and the installation block is made of high-temperature resistant ceramic, and the side-blowing nozzle is also made of high-temperature resistant ceramic material and is integrally formed with the installation block; and the reduction furnace is provided with a fixing mechanism for fixing the installation block in the installation port.

[0009] As a preferred embodiment of the present invention, the heat exchange mechanism includes a heat exchange shell, and a spirally arranged heat exchange tube is provided inside the heat exchange shell; and the heat exchange shell is provided with an inlet pipe and an outlet pipe communicating with the heat exchange shell, and the heat exchange tube is connected in series with the gas guide pipe, and the inlet pipe is connected to the exhaust pipe on the reduction furnace.

[0010] As a preferred embodiment of the present invention, a ceramic heat insulation plate is provided inside the heat exchange shell.

[0011] A pulverized coal injection metering device is applied in a side-blown reduction furnace utilizing primary lead concentrate, comprising a weighing module mounted on the top of the reduction furnace via a support, and a weighing tank for buffering pulverized coal on the weighing module. A discharge pipe is located at the bottom of the weighing tank. A feed pipe is located on the reduction furnace, and a pulverized coal adding mechanism is located inside the discharge pipe for adding pulverized coal into the feed pipe. A nozzle is located on the feed pipe for air-injecting the pulverized coal added by the pulverized coal adding mechanism. The nozzle is connected to a gas supply mechanism via a gas supply pipe, and a pulse valve is located on the gas supply pipe. A pulverized coal injection pipe extending into the molten liquid is located at the bottom of the feed pipe.

[0012] As a preferred embodiment of the present invention, the pulverized coal addition mechanism includes a feeding chamber with a circular cross-section disposed at the bottom of the discharge pipe. The feeding chamber is provided with a feeding disc that rotates along the feeding chamber, and the feeding disc is provided with a plurality of metering grooves. The inner wall surface of the feeding chamber is provided with a rubber sealing layer for sealing the feeding disc and the inner wall of the feeding chamber. The bottom of the discharge pipe is connected to a buffer hopper via a flexible connection, and the bottom of the buffer hopper is provided with a horizontally arranged spray pipe connected to the feed pipe. The nozzle is disposed at the end of the spray pipe.

[0013] As a preferred embodiment of the present invention, the slow-feeding hopper is provided with a waste heat heating mechanism for heating pulverized coal. The waste heat heating mechanism includes a heat exchange spiral tube disposed in the slow-feeding hopper. One end of the heat exchange spiral tube is connected to the flue gas pipe, and the other end of the heat exchange spiral tube is connected to the waste gas treatment device.

[0014] As a preferred embodiment of the present invention, the slow hopper is provided with a nozzle for purging the metering groove and the heat exchange spiral tube, and the nozzle is connected to the air supply mechanism.

[0015] As a preferred embodiment of the present invention, nitrogen protective gas is introduced into the weighing tank.

[0016] The beneficial effects of this invention are:

[0017] 1. This invention features multiple laterally inclined side-blowing nozzles installed from top to bottom inside a reduction furnace, all facing the same direction. When nitrogen is introduced into the furnace, it creates a flowing environment, effectively stirring the coal powder and molten liquid, ensuring thorough mixing and contact. A heat exchange mechanism is installed between the gas guide pipe and the exhaust pipe to heat the gas entering the gas guide pipe, resulting in a higher initial temperature for the nitrogen entering the reduction furnace. This reduces the amount of heat carried away by the exhaust gas, thus lowering the furnace's energy consumption. Furthermore, the heat exchange mechanism eliminates the need for long pipes to transport the exhaust gas, reducing heat loss and improving heat exchange efficiency. It also provides initial cooling of the high-temperature exhaust gas, facilitating subsequent treatment.

[0018] 2. In this invention, a straight heat exchange tube connected in series with the gas supply pipe is used. This straight design effectively reduces resistance. A ceramic insulation plate is installed inside the heat exchange shell. This prevents high-temperature flue gas from damaging the heat exchange shell and also provides insulation, reducing heat loss.

[0019] 3. The side-blowing nozzle described in this invention is mounted on the reduction furnace via a disassembly mechanism. The inner side of the mounting port is provided with a edging made of a high-temperature resistant ceramic plate, which prevents the molten liquid from corroding the side of the mounting port. Furthermore, the through hole facilitates the installation and disassembly of the mounting block, making it convenient to replace the damaged side-blowing nozzle.

[0020] 4. In this invention, a specific coal powder injection metering device is used to measure coal powder. A weighing module weighs the coal powder in the weighing tank. The discharge pipe at the bottom of the weighing tank is connected to the slow-feeding hopper via a flexible connection, thus avoiding any impact on the weighing of the material in the weighing tank. The coal powder is fed through a quantitative groove on a feeding disc. As the feeding disc rotates, the coal powder in the quantitative groove automatically falls into the slow-feeding hopper and then into the injection pipe. The high-pressure gas in the injection pipe then transports the coal forward into the reduction furnace. This eliminates the need for pipes and valves, thus avoiding wear and tear on valves and pipes. By controlling the rotation speed of the feeding disc, quantitative control of the coal powder delivery can be achieved, making it easily adjustable.

[0021] 5. In this invention, a waste heat heating mechanism is also set up to heat the coal powder inside the slow feed hopper, so as to realize the recovery and utilization of high-temperature exhaust gas, while increasing the initial temperature of the coal powder, making the coal powder easier to burn, and reducing the heat loss to the reduction furnace. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of a side-blown reduction furnace for primary lead concentrate according to the present invention;

[0024] Figure 2 This is a schematic diagram of the installation of the side-blowing nozzle in a side-blowing reduction furnace for primary lead concentrate according to the present invention.

[0025] Figure 3 This is a schematic diagram of the side-blowing nozzle arrangement in a side-blowing reduction furnace for primary lead concentrate according to the present invention.

[0026] Figure 4 This is a schematic diagram of the waste heat heating mechanism of a side-blown reduction furnace for primary lead concentrate according to the present invention.

[0027] Figure 5 This is a schematic diagram of the structure of a pulverized coal injection metering device according to the present invention;

[0028] Figure 6 This is a schematic diagram of the coal powder adding mechanism of a coal powder injection metering device according to the present invention;

[0029] Figure 7 This is a schematic diagram of the nozzle structure of a pulverized coal injection metering device according to the present invention;

[0030] Figure 8 This is a schematic diagram of the feeding disc of a pulverized coal injection metering device according to the present invention.

[0031] In the diagram: 1. Reduction furnace; 101. Side-blowing nozzle; 102. Gas guide pipe;

[0032] Pulverized coal injection metering device; 201, weighing tank; 202, discharge pipe; 203, pulverized coal adding mechanism; 205, feeding chamber; 206, feeding disc; 207, rubber sealing layer; 208, buffer hopper; 209, feed pipe; 210, nozzle; 212, waste heat heating mechanism; 213, heat exchange spiral tube; 214, flexible connection; 215, rubber sealing layer; 216, cleaning nozzle;

[0033] 4. Exhaust pipe; 5. Gas supply mechanism; 6. Heat exchange mechanism; 601. Heat exchange shell; 602. Heat exchange tube; 603. Inlet pipe; 604. Outlet pipe; 605. Ceramic insulation plate;

[0034] 7. Installation port; 8. Edge banding; 9. Installation block; 11. Stepped sealing step; 12. Sealing groove; 13. Pulverized coal injection pipe. Detailed Implementation

[0035] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0036] Example: Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the present invention discloses a side-blown reduction furnace for primary lead concentrate, comprising a reduction furnace 1 and a pulverized coal injection metering device 2; the pulverized coal injection metering device 2 is disposed on the top of the reduction furnace 1, and the discharge end of the pulverized coal injection metering device 2 is connected to the top of the reduction furnace 1 for blowing pulverized coal into the reduction furnace 1; a plurality of side-blown nozzles 101 are installed from top to bottom inside the reduction furnace 1, and a flue pipe 4 is provided on the top of the reduction furnace 1; a gas supply mechanism 5 is also included for providing protective nitrogen to the side-blown nozzles 101; the gas supply mechanism 5 is connected to the side-blown nozzles 101 via a gas guide pipe 102, and a heat exchange mechanism 6 is provided between the gas guide pipe 102 and the flue pipe 4, the heat exchange mechanism 6 being used to heat the gas in the gas guide pipe 102; the side-blown nozzles 101 are disposed on the reduction furnace 1 via a disassembly mechanism. By installing multiple laterally inclined side-blowing nozzles 101 from top to bottom inside the reduction furnace 1, with all nozzles 101 facing the same direction, the furnace 1 is in a flowing state when nitrogen is introduced, thus achieving a stirring effect and ensuring thorough mixing and contact between the pulverized coal and the molten liquid. A heat exchange mechanism 6 is provided between the gas guide pipe 102 and the exhaust pipe 4 to heat the gas in the gas guide pipe 102, ensuring the nitrogen entering the reduction furnace 1 has a higher initial temperature. This reduces the amount of heat carried away by the exhaust gas, thereby reducing the energy consumption of the reduction furnace 1. Furthermore, the heat exchange mechanism 6 on the reduction furnace 1 eliminates the need for long pipes to transport the exhaust gas, reducing heat loss and ensuring better heat exchange during the process. It also provides initial cooling of the high-temperature exhaust gas, facilitating subsequent exhaust gas treatment.

[0037] The disassembly mechanism includes an installation port 7 on the reduction furnace 1, with an inner edging 8 made of high-temperature resistant ceramic plate. The side-blowing nozzle 101 has an installation block 9 for installation within the installation port 7, and the installation block 9 has a stepped sealing step 11. The inner side of the edging 8 has a sealing groove 12 that mates with the stepped sealing step 11. The installation block 9 is made of high-temperature resistant ceramic, and the side-blowing nozzle 101 is also made of high-temperature resistant ceramic and integrally formed with the installation block 9. The reduction furnace 1 also has a fixing mechanism for securing the installation block 9 within the installation port 7. The inner side of the installation port 7 has an edging 8 made of high-temperature resistant ceramic plate to prevent molten liquid from eroding the side of the installation port 7. The through-hole facilitates the installation and disassembly of the installation block 9, allowing for easy replacement of damaged side-blowing nozzles 101.

[0038] The heat exchange mechanism 6 includes a heat exchange shell 601, inside which spirally arranged heat exchange tubes 602 are provided. The heat exchange shell 601 is equipped with an inlet pipe 603 and an outlet pipe 604 communicating with it. The heat exchange tubes are connected in series to the gas guide pipe 102, and the inlet pipe is connected to the exhaust pipe 4 on the reduction furnace 1. By setting a straight heat exchange tube 602 connected in series to the gas guide pipe 102, and with the heat exchange tube 602 connected to the gas supply mechanism 5, the straight shape effectively reduces resistance. A ceramic heat insulation plate 605 is provided inside the heat exchange shell 601. This prevents high-temperature flue gas from damaging the heat exchange shell 601 and provides heat insulation, reducing heat loss.

[0039] One type of pulverized coal injection metering device is used in the aforementioned side-blown reduction furnace for primary lead concentrate, specifically as follows: Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the furnace includes a weighing module mounted on top of the reduction furnace via a support, and a weighing tank 201 for buffering pulverized coal on the weighing module. A discharge pipe 202 is provided at the bottom of the weighing tank 201. The reduction furnace is provided with a feed pipe 209, and a pulverized coal adding mechanism 203 for adding pulverized coal into the feed pipe 209 is provided inside the discharge pipe 202. A nozzle for air-spraying the pulverized coal added by the pulverized coal adding mechanism 203 is provided on the feed pipe 209, and the nozzle is connected to the gas supply mechanism 5 via a gas supply pipe. A pulse valve is provided on the gas supply pipe.

[0040] The pulverized coal addition mechanism 203 includes a feeding chamber 205 with a circular cross-section located at the bottom of the discharge pipe 202. The feeding chamber 205 contains a feeding disc 206 that rotates along the feeding chamber 205. The feeding disc 206 has multiple metering grooves 207. The inner wall surface of the feeding chamber 205 is provided with a rubber sealing layer 215 for sealing the feeding disc 206 and the inner wall of the feeding chamber 205. The bottom of the discharge pipe 202 is connected to a buffer hopper 208 via a flexible connection 214. The bottom of the buffer hopper 208 is provided with a horizontally arranged spray pipe 210 connected to the feed pipe 209. The nozzle is located at the end of the spray pipe 210. The coal powder is metered by a specific coal powder injection metering device 2. The coal powder in the weighing tank 201 is weighed by a weighing module. The discharge pipe 202 at the bottom of the weighing tank 201 is connected to the slow hopper 208 via a flexible connection, so as not to affect the weighing of the material in the weighing tank 201. The coal powder is fed by a quantitative groove on the feeding disc 206. The coal powder in the quantitative groove falls into the slow hopper 208 as the feeding disc rotates and enters the nozzle 210. The high-pressure gas in the nozzle 210 conveys the coal forward and into the reduction furnace 1. This eliminates the need for pipes and valves, thus avoiding wear on valves and pipes. The quantitative control of the coal powder conveying can be achieved by controlling the rotation speed of the feeding disc, which is easy to adjust.

[0041] The slow-feed hopper 208 is equipped with a waste heat heating mechanism 212 for heating pulverized coal. The waste heat heating mechanism 212 includes a heat exchange spiral tube 213 disposed within the slow-feed hopper 208. One end of the heat exchange spiral tube 213 is connected to the exhaust pipe 4, and the other end is connected to the waste gas treatment device. By setting up the waste heat heating mechanism to heat the pulverized coal inside the slow-feed hopper, the high-temperature exhaust gas is recovered and utilized. Simultaneously, the initial temperature of the pulverized coal is increased, making it easier to burn, while reducing heat loss to the reduction furnace.

[0042] The slow-feed hopper 208 is equipped with a cleaning nozzle 216 for purging the metering groove 207 and the heat exchange spiral tube 213, and the cleaning nozzle 216 is connected to the gas supply mechanism 5. This ensures that there is no residue in the metering groove 207, facilitating the detachment of coal powder from the metering groove 207. Furthermore, by injecting nitrogen into the slow-feed hopper 208, the pressure balance of the slow-feed hopper 208 is broken, thereby facilitating the entry of coal powder in the slow-feed hopper 208 into the interior of the nozzle 210, and also purging the heat exchange spiral tube 213, preventing coal powder from adhering to the surface of the heat exchange spiral tube 213.

[0043] The weighing tank 201 is filled with nitrogen protective gas, which plays a protective role in preventing the coal powder from igniting spontaneously and ensuring the safety of use.

[0044] During operation, this primary lead concentrate utilizes a side-blown reduction furnace. Multiple side-blown nozzles 101 are installed from top to bottom within the furnace 1, all facing the same direction. When nitrogen is introduced into the furnace 1, it creates a flowing state, thus agitating the pulverized coal and molten liquid, ensuring thorough mixing and contact. A heat exchange mechanism 6 is installed between the gas guide pipe 102 and the exhaust pipe 4. This mechanism heats the gas within the gas guide pipe 102, resulting in a higher initial temperature for the nitrogen entering the furnace 1. This reduces the amount of heat carried away by the exhaust gas, thus lowering the energy consumption of the furnace 1. Furthermore, the heat exchange mechanism 6 eliminates the need for long pipes to transport the exhaust gas, reducing heat loss and improving heat exchange efficiency. It also provides initial cooling of the high-temperature exhaust gas, facilitating subsequent treatment.

[0045] The coal powder is metered by a specific coal powder injection metering device 2. The coal powder in the weighing tank 201 is weighed by a weighing module. The discharge pipe 202 at the bottom of the weighing tank 201 is connected to the slow hopper 208 via a flexible connection, so as not to affect the weighing of the material in the weighing tank 201. The coal powder is fed by a quantitative groove on the feeding disc 206. The coal powder in the quantitative groove falls into the slow hopper 208 as the feeding disc rotates and enters the nozzle 210. The high-pressure gas in the nozzle 210 conveys the coal forward and into the reduction furnace 1. This eliminates the need for pipes and valves, thus avoiding wear on valves and pipes. The quantitative control of the coal powder conveying can be achieved by controlling the rotation speed of the feeding disc, which is easy to adjust.

[0046] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A side-blown reduction furnace for primary lead concentrate, characterized in that, The system includes a reduction furnace (1) and a pulverized coal injection metering device (2); the discharge end of the pulverized coal injection metering device (2) is connected to the top of the reduction furnace (1) for injecting pulverized coal into the reduction furnace (1); multiple side-blowing nozzles (101) are installed from top to bottom inside the reduction furnace (1), and the top of the reduction furnace (1) is provided with a flue pipe (4), and a gas supply mechanism (5) is also included for providing protective nitrogen to the side-blowing nozzles (101); the gas supply mechanism (5) is connected to the gas guide pipe (102) and the side-blowing nozzles (101), and a heat exchange mechanism (6) is provided between the gas guide pipe (102) and the flue pipe (4), the heat exchange mechanism (6) is used to heat the gas in the gas guide pipe (102); the side-blowing nozzles (101) are installed on the reduction furnace (1) via a disassembly mechanism. A pulverized coal injection metering device is applied in a side-blown reduction furnace for primary lead concentrate. It includes a weighing module mounted on the top of the reduction furnace via a support, and a weighing tank (201) for buffering pulverized coal on the weighing module. A discharge pipe (202) is located at the bottom of the weighing tank (201). A feed pipe (209) is located on the reduction furnace, and a pulverized coal adding mechanism (203) is located inside the discharge pipe (202) for adding pulverized coal to the feed pipe (209). A nozzle is located on the feed pipe (209) for injecting the pulverized coal added by the pulverized coal adding mechanism (203) into the gas. The nozzle is connected to a gas supply mechanism (5) via a gas transmission pipe, and a pulse valve is located on the gas transmission pipe. A pulverized coal injection pipe (13) extending into the molten liquid is located at the bottom of the feed pipe (209). The coal powder adding mechanism (203) includes a feeding chamber (205) with a circular cross-section located at the bottom of the discharge pipe (202). The feeding chamber (205) is provided with a feeding disc (206) that rotates along the feeding chamber (205). The feeding disc (206) is provided with a plurality of quantitative grooves (207). The inner wall surface of the feeding chamber (205) is provided with a rubber sealing layer (215) for sealing the feeding disc (206) and the inner wall of the feeding chamber (205). The bottom of the discharge pipe (202) is connected to a buffer hopper (208) via a flexible connection (214). The bottom of the buffer hopper (208) is provided with a horizontally arranged spray pipe (210) connected to the feed pipe (209). The nozzle is located at the end of the spray pipe (210). The slow-feed hopper (208) is equipped with a waste heat heating mechanism (212) for heating pulverized coal. The waste heat heating mechanism (212) includes a heat exchange spiral tube (213) installed inside the slow-feed hopper (208). One end of the heat exchange spiral tube (213) is connected to the flue gas pipe (4), and the other end of the heat exchange spiral tube (213) is connected to the waste gas treatment device. The side-blowing nozzles (101) are tangentially inclined to the reduction furnace (1), and the multiple side-blowing nozzles (101) are oriented in the same direction; The disassembly mechanism includes an installation port (7) on the reduction furnace (1), and the inner side of the installation port (7) is provided with a edging (8) made of high-temperature resistant ceramic plate; the side-blowing nozzle (101) is provided with an installation block (9) for installation in the installation port (7), and the installation block (9) is provided with a stepped sealing step (11), and the inside of the edging (8) is provided with a sealing groove (12) that cooperates with the stepped sealing step (11); the installation block (9) is made of high-temperature resistant ceramic, and the side-blowing nozzle (101) is also made of high-temperature resistant ceramic material and is integrally formed with the installation block (9); the reduction furnace (1) is provided with a fixing mechanism for fixing the installation block (9) in the installation port (7); The heat exchange mechanism (6) includes a heat exchange shell (601), and a spirally arranged heat exchange tube (602) is provided inside the heat exchange shell (601); and the heat exchange shell (601) is provided with an air inlet pipe (603) and an air outlet pipe (604) communicating with the heat exchange shell (601), and the heat exchange tube is connected in series with the air guide pipe (102), and the air inlet pipe is connected to the exhaust pipe (4) on the reduction furnace (1).

2. The side-blown reduction furnace for primary lead concentrate according to claim 1, characterized in that, A ceramic heat insulation plate (605) is provided inside the heat exchange shell (601).

3. The side-blown reduction furnace for primary lead concentrate according to claim 1, characterized in that, The slow hopper (208) is provided with a cleaning nozzle (216) for purging the metering groove (207) and the heat exchange spiral tube (213), and the cleaning nozzle (216) is connected to the air supply mechanism (5).

4. The side-blown reduction furnace for primary lead concentrate according to claim 1, characterized in that, Nitrogen protective gas is introduced into the weighing tank (201).

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