Antimony running furnace

Abstract

The antimony running furnace comprises a furnace body, a combustor and an air inlet pipe, the furnace body is of a vertical barrel structure, a smoke outlet is formed in the top of the furnace body, and a feeding port and a bottom discharging port are formed in the side wall of the furnace body; a burner nozzle of the burner and the air inlet pipe both penetrate through the side wall of the furnace body to be installed, the axial center line of the burner nozzle of the burner deviates from the diameter direction of the furnace body at the burner nozzle installation position, and the deviation angle is alpha; the axial center line of the air inlet pipe deviates from the diameter direction of the furnace body at the installation position of the air inlet pipe, and the deviation angle is beta. The antimony running furnace solves the technical problem that in the prior art, the antimony running operation period is long.

Description

Technical Field

[0001] This utility model belongs to the technical field of non-ferrous metal smelting equipment, specifically relating to an antimony-running furnace. Background Technology

[0002] In the pyrometallurgical processing of lead anode mud, the antimony-rich precious lead needs to be oxidized by forced draft at around 700℃ in an antimony-running furnace. This oxidation and volatilization of the antimony in the precious lead results in its enrichment in the flue dust, producing the byproduct antimony-oxygen powder. Currently, horizontal converters are commonly used for antimony-running. Due to the cylindrical structure of the converter, the internal lead level is high and the lead surface area is small during antimony-running operations, leading to a long operation cycle for surface oxidation. Furthermore, the converter's feeding port is relatively narrow, making it inconvenient to add precious lead ingots mid-process.

[0003] Chinese utility model patent authorization announcement CN208635543U discloses a novel antimony blowing furnace, including a furnace body. The furnace body has a top cover with an upper panel and a lower panel, forming an air inlet chamber between them. The lower surface of the lower panel has several air inlet pipes, each with a first air outlet at its lower end. The air inlet pipes extend into the furnace body and communicate with the air inlet chamber. The lower panel has a first smoke outlet communicating with the interior of the furnace body. The upper panel has an air inlet and a second smoke outlet communicating with the air inlet chamber. The first smoke outlet is located below the second smoke outlet. This patent increases the air intake by increasing the air inlet area, thereby improving oxidation efficiency. However, the oxidation area on the lead melt surface of the furnace body remains unchanged, resulting in limited improvement in oxidation efficiency and a still relatively long antimony blowing operation cycle. Utility Model Content

[0004] In view of the existing technical problems, the present invention aims to provide an antimony running furnace, which can solve the technical problem of long antimony running operation cycle in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An antimony-running furnace includes a furnace body, a burner, and an air inlet pipe. Its structural features are as follows: the furnace body is a vertical cylindrical structure with a flue gas outlet at the top and a feed inlet and a discharge outlet at the bottom on the side wall; the burner nozzle and the air inlet pipe are both installed through the side wall of the furnace body, and the axial centerline of the burner nozzle deviates from the furnace body diameter direction at the nozzle installation location by an angle α; the axial centerline of the air inlet pipe deviates from the furnace body diameter direction at the air inlet pipe installation location by an angle β.

[0007] When using the antimony-running furnace, the air inlet of the air inlet pipe is connected to an external air source. Feed is added through the feed port, and the air used for oxidation inside the furnace is supplied by the external air source and transported into the furnace body through the air inlet pipe. The burner burns natural gas or fuel oil to heat the furnace body, raising the furnace temperature. The generated flue gas is discharged from the top flue gas outlet, and the molten metal is discharged from the bottom discharge port. The antimony-running furnace of this application has a vertical structure, and the axial centerline of the burner nozzle is offset from the radial direction of the furnace body. This allows the high-temperature flame generated by combustion to follow a spiral upward trajectory within the furnace chamber, thereby extending the residence time of the high-temperature flue gas in the furnace chamber, improving the thermal utilization efficiency and antimony oxidation efficiency of the antimony-running furnace, and shortening the antimony-running operation cycle.

[0008] Preferably, 3°≤α≤60°, 3°≤β≤60°.

[0009] Preferably, the deviation direction of the axial centerline of the air inlet outlet is the same as the deviation direction of the axial centerline of the burner nozzle, and the deviation angle α = β. The fact that the radial deviation direction and deviation angle of the air inlet and the burner are the same allows the high-temperature flame to form a coordinated spiral trajectory, thereby further improving the antimony oxidation efficiency and shortening the antimony running cycle.

[0010] Preferably, the furnace body sidewall is provided with multiple air inlet pipes, all of which are connected to the main air duct, which in turn is connected to the air outlet of the blower. The multiple air inlet pipes ensure uniform airflow into the furnace chamber, resulting in a more uniform temperature field within the furnace.

[0011] Preferably, multiple air inlet pipes are arranged symmetrically around the circumference of the furnace side wall, and each air inlet pipe is equipped with a valve and a pressure sensor. The valves are used to regulate the air supply pressure of the air inlet pipes, so that the air supply pressure of each air inlet pipe is consistent.

[0012] Preferably, a first thermometer and a second thermometer are installed on the side wall of the furnace body. The first thermometer is installed on the upper part of the side wall and inserted horizontally into the furnace; the second thermometer is installed on the lower middle part of the side wall and inserted diagonally downwards into the furnace. The blower, the first thermometer, the second thermometer, and the pressure sensor on the air inlet pipe are all electrically connected to the PLC control system. The first thermometer is used to measure the temperature of the furnace atmosphere, and the second thermometer is used to measure the temperature of the molten metal inside the furnace. By monitoring the data from the first thermometer, the second thermometer, and the pressure sensor through the PLC control system, the blower pressure is controlled, thereby ensuring controllable temperature and stable operating conditions inside the furnace.

[0013] Preferably, the axial centerline of the air inlet and / or the axial centerline of the burner nozzle are inclined towards the bottom of the furnace body.

[0014] Preferably, the furnace bottom of the furnace body includes a first high-alumina brick layer, a first castable refractory layer, and a first magnesia-chrome brick layer arranged sequentially from the outside to the inside; a first insulating brick layer is arranged on the outer layer of the furnace body sidewall, and this first insulating brick layer is positioned above the first high-alumina brick layer; a second magnesia-chrome brick layer and a second high-alumina brick layer are arranged sequentially from the bottom to the top of the insulating brick layer; the furnace top of the furnace body includes a third high-alumina brick layer, a second castable refractory layer, and a second insulating brick layer arranged sequentially from the inside to the outside; the furnace body is set inside an outer protective steel plate, and an aluminum silicate fiber board is provided between the furnace body and the outer protective steel plate; the size of the feed inlet is consistent with the size of the manhole door. The antimony-running furnace of this application is constructed with double-layer refractory materials, resulting in a long furnace service life and low maintenance costs. The antimony-running furnace of this application increases the size of the feed inlet to the size of a manhole door, making mid-process material replenishment more convenient, and the feed inlet can also serve as a manhole door.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. The antimony-running furnace of this utility model has a vertical structure, and the burner nozzle is deviated from the radial direction of the furnace body, so that the high-temperature flame generated by combustion has a spiral upward trajectory in the furnace, thereby prolonging the residence time of high-temperature flue gas in the furnace, improving the heat utilization efficiency and antimony oxidation efficiency of the antimony-running furnace, and shortening the antimony-running operation cycle.

[0017] 2. The antimony-running furnace of this utility model has controllable internal temperature and blast pressure, and stable internal operating conditions;

[0018] 3. The antimony-running furnace of this utility model is constructed with double-layer refractory materials, resulting in a long service life and low maintenance costs.

[0019] 4. The antimony furnace of this application increases the size of the feed inlet to the size of a manhole, making it more convenient to replenish material midway, and the feed inlet can also serve as a manhole. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the antimony-running furnace of this utility model;

[0021] Figure 2 This is a schematic diagram of the antimony-running furnace structure of this utility model;

[0022] Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure of AA.

[0023] In the figure

[0024] 1-Furnace body, 101-First high-alumina brick layer, 102-First castable layer, 103-First magnesia-chrome brick layer, 104-First insulating brick layer, 105-Second magnesia-chrome brick layer, 106-Second high-alumina brick layer, 107-Third high-alumina brick layer, 108-Second castable layer, 109-Second insulating brick layer, 2-Burner, 3-Blower, 4-Main air duct, 5-Air inlet duct, 6-Feed inlet, 7-Bottom outlet, 8-Flue gas outlet, 9-First thermometer, 10-Second thermometer, 11-Valve, 12-Pressure sensor, 13-Outer steel plate, 14-Alumina silicate fiberboard, 15-PLC control system, 16-Steel flue. Detailed Implementation

[0025] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0026] like Figure 1 and Figure 2 As shown, a high-efficiency antimony-running furnace according to this embodiment includes a furnace body 1, which has a vertical cylindrical structure and is surrounded by an outer protective steel plate 13. An aluminum silicate fiberboard 14 is laid on the inner side of the outer protective steel plate 13. The furnace bottom of the furnace body 1 includes a first high-alumina brick layer 101, a first castable refractory layer 102, and a first magnesia-chrome brick layer 103 arranged sequentially from the outside to the inside. A first insulating brick layer 104 is arranged on the outer side wall of the furnace body 1, and this first insulating brick layer 104 is positioned above the first high-alumina brick layer 101. A second magnesia-chrome brick layer 105 and a second high-alumina brick layer 106 are arranged sequentially from bottom to top on the inner side of the insulating brick layer 104. The furnace top of the furnace body 1 includes a third high-alumina brick layer 107, a second castable refractory layer 108, and a second insulating brick layer 109 arranged sequentially from the inside to the outside.

[0027] like Figure 2 As shown, a flue gas outlet 8 is located in the middle of the furnace top of the furnace body 1, and this flue gas outlet 8 is connected to the steel flue 16. A feed inlet 6 is located in the middle of the side wall of the furnace body 1. The size of the feed inlet 6 is the same as the size of the manhole door, so that the feed inlet 6 can also serve as a manhole door. A bottom discharge outlet 7 is located at the bottom of the side wall of the furnace body 1. A blower 3 is installed outside the furnace body 1. A main air duct 4 is located at the air outlet of the blower 3, and three air inlet pipes 5 are installed on the main air duct 4. Figure 3As shown, the outlets of the three air inlet pipes 5 all extend into the furnace body 1 through the side wall of the furnace body 1. The axial centerline of the air inlet pipe 5 deviates from the diameter direction of the furnace body 1 at the installation location of the air inlet pipe 5, and the deviation angle is β. A burner 2 is installed on the side wall of the furnace body 1. The burner nozzle of the burner 2 extends into the furnace body 1 through the side wall of the furnace body 1. The axial centerline of the burner nozzle of the burner 2 deviates from the diameter direction of the furnace body 1 at the installation location of the burner nozzle, and the deviation angle is α. The deviation direction of the axial centerline of each air inlet pipe 5 outlet is the same as the deviation direction of the axial centerline of the burner nozzle of the burner 2, and the deviation angle is 3°≤α=β≤60°. The air inlet pipe 5 outlet and the burner nozzle of the burner 2 are all inclined towards the bottom of the furnace body 1. The three air inlet pipes 5 are arranged symmetrically around the circumference of the side wall of the furnace body 1, and each air inlet pipe 5 is equipped with a valve 11 and a pressure sensor 12. A first temperature measuring instrument 9 and a second temperature measuring instrument 10 are provided on the side wall of the furnace body 1. The first temperature measuring instrument 9 is located above the burner 2, and the second temperature measuring instrument 10 is located below the burner 2. The blower 3, the first temperature measuring instrument 9, the second temperature measuring instrument 10 and the pressure sensor 12 are all electrically connected to the PLC control system 15.

[0028] During operation, the antimony furnace is fed through inlet 6. The burner 2 uses natural gas or fuel oil for heating, raising the furnace temperature to approximately 700℃. The internal insulation material effectively insulates the furnace. A second thermometer 10, installed on the side wall of furnace body 1, extends below the molten lead surface to accurately measure the lead temperature. A first thermometer 9, also installed on the side wall of furnace body 1, accurately measures the furnace atmosphere temperature. The air required for oxidation in the antimony furnace is supplied by a blower 3 and delivered into the furnace through three air inlet pipes 5. Each of the three air inlet pipes 5 is equipped with a valve 11 to regulate and maintain consistent air pressure. By adjusting the installation angle of the burner 2's nozzles, the high-temperature flame generated by combustion ascends in a spiral trajectory within the furnace, extending the residence time of the high-temperature flue gas and improving the thermal efficiency of the antimony furnace. Simultaneously, the installation angles of the three air inlet pipes 5 are set to match the installation angle of the burner 2 and the same radial deviation direction, thus forming a coordinated spiral trajectory and ensuring full contact with the lead liquid surface in the furnace, resulting in more efficient antimony oxidation. The exhaust gas carrying antimony oxygen powder is discharged from the flue gas outlet 8 at the top of the furnace. The steel flue duct 16 is connected to the flue gas outlet 8, and the rear end of the steel flue duct 16 is connected to the flue gas dust collection system. After the antimony running operation is completed, the obtained precious lead bottom water is discharged through the bottom outlet 7. In this embodiment, the size of the antimony running furnace inlet 6 is increased to the size of a manhole, making mid-process material replenishment more convenient. The inlet duct 6 can also serve as a manhole.

[0029] The above embodiments should be understood as being used only to illustrate the present invention more clearly, and not to limit the scope of the present invention. After reading the present invention, any modifications of the embodiments by those skilled in the art in various equivalent forms fall within the scope defined by the appended claims.

Claims

1. An antimony-running furnace, comprising a furnace body (1), a burner (2), and an air inlet pipe (5), characterized in that: The furnace body (1) is a vertical cylindrical structure. The top of the furnace body (1) is provided with a flue gas outlet (8), and the side wall of the furnace body (1) is provided with a feed inlet (6) and a bottom discharge outlet (7). The burner (2) and the air inlet pipe (5) are installed through the side wall of the furnace body (1). The axial center line of the burner (2) is deviated from the diameter direction of the furnace body (1) where the burner is installed, and the deviation angle is α. The axial center line of the air inlet pipe (5) is deviated from the diameter direction of the furnace body (1) where the air inlet pipe (5) is installed, and the deviation angle is β.

2. The antimony-running furnace according to claim 1, characterized in that: 3°≤α≤60°，3°≤β≤60°。 3. The antimony-running furnace according to claim 1, characterized in that: The deviation direction of the axial center line of the air outlet of the air inlet pipe (5) is the same as the deviation direction of the axial center line of the burner (2), and the deviation angle α = β.

4. The antimony-running furnace according to claim 1, characterized in that: The furnace body (1) has multiple air inlet pipes (5) on its side wall. All the air inlet pipes (5) are connected to the main air pipe (4), which is connected to the air outlet of the blower (3).

5. The antimony-running furnace according to claim 4, characterized in that: Multiple air inlet pipes (5) are arranged symmetrically around the side wall of the furnace body (1), and each air inlet pipe (5) is equipped with a valve (11) and a pressure sensor (12).

6. The antimony-running furnace according to claim 4, characterized in that: The furnace body (1) is provided with a first thermometer (9) and a second thermometer (10) on its side wall. The first thermometer (9) is installed on the upper part of the side wall of the furnace body (1) and is inserted horizontally into the furnace. The second thermometer (10) is installed on the lower middle part of the side wall of the furnace body (1) and is inserted obliquely downward into the furnace. The pressure sensor (12) on the blower (3), the first thermometer (9), the second thermometer (10) and the air inlet pipe (5) is electrically connected to the PLC control system (15).

7. The antimony-running furnace according to any one of claims 1 to 6, characterized in that: The axial centerline of the air inlet pipe (5) and / or the axial centerline of the burner (2) are inclined toward the bottom of the furnace body (1).

8. The antimony-running furnace according to any one of claims 1 to 6, characterized in that: The furnace body (1) has a furnace bottom comprising a first high-alumina brick layer (101), a first castable layer (102), and a first magnesia-chrome brick layer (103) arranged sequentially from the outside to the inside. The furnace body (1) has a first insulating brick layer (104) arranged on the outer side wall, which is located above the first high-alumina brick layer (101). The inner side of the insulating brick layer (104) is provided with a second magnesia-chrome brick layer (105) and a second high-alumina brick layer (106) arranged sequentially from the bottom to the top. The furnace body (1) has a furnace top comprising a third high-alumina brick layer (107), a second castable layer (108), and a second insulating brick layer (109) arranged sequentially from the inside to the outside. The furnace body (1) is located inside an outer protective steel plate (13), and an aluminum silicate fiberboard (14) is provided between the furnace body (1) and the outer protective steel plate (13). The dimensions of the feed inlet (6) are the same as those of the manhole.

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