Slag foaming device and waste heat recovery equipment

Abstract

This invention relates to a slag foaming device and a waste heat recovery equipment. The slag foaming device includes a furnace body, a drive mechanism, a spraying mechanism, and a slag granulation mechanism. The furnace body has a furnace chamber, a feed port, and a slag outlet, both of which are connected to the furnace chamber. The drive mechanism is connected to the furnace body and drives the furnace body to rotate around a first axis. The spraying mechanism includes a first spray gun and a second spray gun. The nozzle of the first spray gun is located on the side of the furnace chamber, and the nozzle of the second spray gun is located at the bottom of the furnace chamber. The slag granulation mechanism is located outside the furnace body and below the slag outlet, and is used to spray pressurized airflow towards the foamed slag overflowing from the slag outlet. The slag foaming device of this invention can uniformly stir the slag, achieving a high degree of foaming, which is beneficial for improving the slag-iron separation rate and facilitating subsequent waste heat recovery from the foamed slag, thus improving the waste heat recovery efficiency of the slag.

Description

Technical Field

[0001] This invention relates to the field of metal smelting technology, specifically to a slag foaming device and a waste heat recovery device having therein. Background Technology

[0002] The high-temperature slag produced by pyrometallurgical processes of copper and nickel is abundant and at high temperatures. Traditional water quenching or slow cooling treatments suffer from drawbacks such as high energy consumption, high water consumption, low slag particle activity, and inability to recover waste heat. In related technologies, slag foaming often relies on fixed vertical furnaces or electric furnaces. However, these structures suffer from problems such as insufficient melt agitation, uneven foaming, incomplete slag-iron separation, and easy nodule formation in the equipment. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention propose a slag foaming device that can uniformly stir the slag, achieve a high degree of foaming, and thus improve the slag-iron separation rate.

[0005] Embodiments of the present invention also propose a waste heat recovery device.

[0006] The slag foaming device of an embodiment of the present invention includes: a furnace body having a furnace chamber, the furnace body having a feed port and a slag outlet, both of which are connected to the furnace chamber; a driving mechanism connected to the furnace body, the driving mechanism being used to drive the furnace body to rotate around a first axis, the first axis being parallel to the horizontal direction of the furnace body, the feed port and the slag outlet being arranged circumferentially at intervals along the first axis; a blowing mechanism for introducing oxygen-containing gas into the furnace chamber, the blowing mechanism including a first spray gun and a second spray gun, the nozzle of the first spray gun being located on the side of the furnace chamber, and the nozzle of the second spray gun being located at the bottom of the furnace chamber; and a slag granulation mechanism located outside the furnace body and below the slag outlet, the slag granulation mechanism being used to spray pressurized airflow toward the foamed slag overflowing from the slag outlet.

[0007] According to an embodiment of the slag foaming apparatus of the present invention, since the driving mechanism can drive the furnace body to rotate around a first axis, the nozzle of the first spray gun is located on the side of the furnace, and the nozzle of the second spray gun is located at the bottom of the furnace, oxygen-containing gas is introduced into the furnace, thereby promoting the stirring, heating, and oxidative foaming of the slag. Since the slag granulation mechanism can spray pressurized airflow toward the foamed slag overflowing from the slag outlet, the overflowing foamed slag can be dispersed, facilitating subsequent heat recovery from the foamed slag. Therefore, the slag foaming apparatus of the embodiment of the present invention can uniformly stir the slag, achieve a high degree of foaming, which is beneficial to improving the slag-iron separation rate and facilitates subsequent waste heat recovery from the foamed slag.

[0008] Optionally, the pressurized airflow is ejected obliquely upward, and the angle between the ejection direction of the pressurized airflow and the horizontal direction is α, where 0 < α ≤ 15°.

[0009] Optionally, the air pressure of the pressurized airflow is between 0.1 MPa and 1.0 MPa.

[0010] Optionally, the feed port and the slag outlet are spaced apart by a preset distance along the direction of the first axis.

[0011] Optionally, the feeding port may also have at least one of the functions of smoke exhaust and secondary air inlet.

[0012] Optionally, there are multiple first spray guns and multiple second spray guns, and the multiple first spray guns and multiple second spray guns are arranged at intervals along the first axis.

[0013] Optionally, the first spray gun introduces a first oxygen-containing gas into the furnace, and the second spray gun introduces a second oxygen-containing gas into the furnace. The oxygen concentration of the first oxygen-containing gas is between 21% and 99.6%, and the flow rate of the first oxygen-containing gas is 900 Nm³. 3 / h-1100Nm 3 / h, the oxygen concentration of the second oxygen-containing gas is between 21% and 99.6%, and the flow rate of the second oxygen-containing gas is 700 Nm³ / h. 3 / h-900Nm 3 / h.

[0014] Another embodiment of the waste heat recovery device of the present invention includes: a slag foaming device, wherein the slag foaming device is the slag foaming device described in any one of the embodiments of the present invention; a waste heat recovery device, wherein the waste heat recovery device includes a radiant heat exchange chamber and a flue gas heat exchange chamber, wherein the slag outlet is connected to one end of the radiant heat exchange chamber, the other end of the radiant heat exchange chamber is connected to the flue gas heat exchange chamber, a first conveyor is provided on the lower side of the radiant heat exchange chamber, and a second conveyor is provided on the lower side of the flue gas heat exchange chamber.

[0015] According to an embodiment of the waste heat recovery device of the present invention, since the driving mechanism can drive the furnace body to rotate around a first axis, the nozzle of the first spray gun is located on the side of the furnace, and the nozzle of the second spray gun is located at the bottom of the furnace, oxygen-containing gas is introduced into the furnace, thereby promoting the stirring, heating, and oxidative foaming of the slag. Since the slag granulation mechanism can spray pressurized airflow toward the foamed slag overflowing from the slag outlet, the overflowing foamed slag can be dispersed, facilitating the subsequent recovery of heat from the foamed slag. Therefore, the waste heat recovery device of the embodiment of the present invention can uniformly stir the slag, achieve a high degree of foaming, which is beneficial to improving the slag-iron separation rate and facilitating the subsequent recovery of heat from the foamed slag.

[0016] Optionally, the top of the radiant heat exchange chamber is provided with a liquid-cooled heat exchange wall, and at least one of the side and bottom of the radiant heat exchange chamber is provided with an air vent, which is used to introduce agitated airflow into the radiant heat exchange chamber.

[0017] Optionally, the top of the radiant heat exchange chamber is provided with a water mist spraying mechanism, which includes multiple water mist nozzles. The multiple water mist nozzles are arranged at intervals along the length of the radiant heat exchange chamber, and the water mist nozzles are used to spray water mist into the radiant heat exchange chamber.

[0018] Optionally, there are multiple air vents, which are arranged at intervals along the length of the radiant heat exchange chamber and in the vertical direction of the radiant heat exchange chamber.

[0019] Optionally, the waste heat recovery equipment further includes a slag bin, which is located at at least one end of the first conveyor along the extension direction of the first conveyor.

[0020] Optionally, the first conveyor is a chain conveyor, and the second conveyor is a scraper conveyor.

[0021] Optionally, a liquid-cooled heat exchanger is provided in the flue gas heat exchange chamber, the liquid-cooled heat exchanger extends in the vertical direction, and the upper end of the liquid-cooled heat exchanger is connected to the top wall of the flue gas heat exchange chamber.

[0022] Optionally, the flue gas heat exchange chamber is provided with a plurality of liquid-cooled heat exchangers, which are arranged at intervals along the length of the flue gas heat exchange chamber. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a slag foaming device according to an embodiment of the present invention.

[0024] Figure 2 yes Figure 1 Cross-sectional view of AA.

[0025] Figure 3 This is a schematic diagram of a waste heat recovery device according to an embodiment of the present invention.

[0026] Figure label:

[0027] 1. Furnace body; 11. Furnace chamber; 12. Feed port; 13. Slag outlet; 14. Refractory layer;

[0028] 2. Drive mechanism; 21. Drive motor; 22. Support roller; 23. Gear ring;

[0029] 3. Spraying mechanism; 31. First spray gun; 32. Second spray gun;

[0030] 4. Slag granulation mechanism;

[0031] 5. Radiant heat exchange chamber; 51. Liquid-cooled heat exchange wall; 52. Air vent; 53. Water mist spray mechanism;

[0032] 6. Flue gas heat exchange chamber; 61. Liquid-cooled heat exchanger;

[0033] 71. First conveyor; 72. Second conveyor; 73. Slag bin;

[0034] 8. Sluice box. Detailed Implementation

[0035] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. 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.

[0036] The following is a reference appendix. Figures 1 to 3 The present invention describes a slag foaming apparatus and a waste heat recovery device having the same.

[0037] like Figures 1 to 3 As shown, the slag foaming device of this embodiment includes: furnace body 1, driving mechanism 2, blowing mechanism 3 and slag granulation mechanism 4.

[0038] The furnace body 1 has a furnace chamber 11, and is equipped with a feed port 12 and a slag outlet 13, both of which are connected to the furnace chamber 11. A drive mechanism 2 is connected to the furnace body 1 and is used to drive the furnace body 1 to rotate around a first axis, which is parallel to the horizontal direction of the furnace body 1. The feed port 12 and the slag outlet 13 are arranged circumferentially along the first axis. A jetting mechanism 3 is used to introduce oxygen-containing gas into the furnace chamber 11. The jetting mechanism 3 includes a first jet gun 31 and a second jet gun 32. The nozzle of the first jet gun 31 is located on the side of the furnace chamber 11, and the nozzle of the second jet gun 32 is located at the bottom of the furnace chamber 11. A slag granulation mechanism 4 is located outside the furnace body 1 and below the slag outlet 13. The slag granulation mechanism 4 is used to spray pressurized airflow towards the foamy slag overflowing from the slag outlet 13.

[0039] According to an embodiment of the slag foaming device of the present invention, since the driving mechanism 2 can drive the furnace body 1 to rotate around the first axis, the nozzle of the first spray gun 31 is located on the side of the furnace chamber 11, and the nozzle of the second spray gun 32 is located at the bottom of the furnace chamber 11, oxygen-containing gas is introduced into the furnace chamber 11, thereby promoting the stirring, heating, and oxidative foaming of the slag. Since the slag granulation mechanism 4 can spray pressurized airflow toward the foamed slag overflowing from the slag outlet 13, the overflowing foamed slag can be dispersed to facilitate subsequent heat recovery from the foamed slag. Therefore, the slag foaming device of the embodiment of the present invention can uniformly stir the slag, achieve a high degree of foaming, which is beneficial to improving the slag-iron separation rate and facilitates subsequent waste heat recovery from the foamed slag.

[0040] It is understandable that, such as Figure 1 and Figure 2 As shown, the furnace body 1 has a horizontal structure and is generally cylindrical. The drive mechanism 2 can drive the furnace body 1 to rotate around the first axis, thereby allowing the furnace body 1 to rotate and lock at any angle. Since the feed port 12 and the slag outlet 13 are arranged circumferentially along the first axis, when the drive mechanism 2 adjusts the rotation angle of the furnace body 1 so that the foamed slag is discharged through the slag outlet 13, the feed port 12 is located above the slag outlet 13, thereby preventing the foamed slag from overflowing from the feed port 12.

[0041] like Figure 1 As shown, the slag outlet 13 is located at the upper part of the tail end of the furnace body 1. The thickness of the foam slag inside the furnace body 1 is adjusted by the tilt angle of the furnace body 1. When the thickness of the foam slag is higher than the bottom of the slag outlet 13, it can be discharged through the slag outlet 13.

[0042] like Figure 1 and Figure 3 As shown, copper / nickel smelting slag at 1400-1500℃ is added into the furnace 11 through the feed port 12 via the chute 8. The drive mechanism 2 is activated to rotate the furnace body 1. Simultaneously, oxygen-containing gas (oxygen concentration between 21% and 99.6%) is injected from the side and bottom of the furnace 11 to promote the oxidation, agitation, and heating of the melt. Under the action of swirling and bubbling, the slag completes the FeO·SiO2 oxidation and foaming, forming foamed slag. When the slag layer in the furnace 11 expands to a certain height, the drive mechanism 2 adjusts the rotation angle of the furnace body 1, allowing the foamed slag to be continuously discharged through the slag outlet 13. The pressurized airflow ejected by the slag granulation mechanism 4 can disperse the discharged foamed slag and throw it outwards.

[0043] Optionally, such as Figure 2 As shown, the pressurized airflow is ejected obliquely upwards, and the angle between the ejection direction of the pressurized airflow and the horizontal direction is α, where 0 < α ≤ 15°. Figure 3 As shown, the pressurized airflow is ejected obliquely upwards in a direction from front to back.

[0044] For example, α can be 1°, 3°, 5°, 7°, 9°, 11°, 13°, or 15°.

[0045] like Figure 1 and Figure 2 As shown, since the slag granulation mechanism 4 is located on the lower side of the slag outlet 13, and the pressurized airflow ejected from the slag granulation mechanism 4 is ejected at an angle upward, the pressurized airflow can break up the foam slag and make the foam slag ejected at an angle upward, thereby prolonging the residence time of the foam slag in the air and making the foam slag evenly dispersed, thereby greatly improving the heat dissipation efficiency of the foam slag.

[0046] In addition, since the angle α between the ejection direction of the pressurized airflow and the horizontal direction is designed with the above parameters, the residence time of the foam slag in the air can be further extended, and the foam slag can be evenly dispersed, thereby greatly improving the heat dissipation efficiency of the foam slag.

[0047] Optionally, the air pressure of the pressurized airflow is between 0.1MPa and 1.0MPa, which can ensure that the foamed slag can be evenly dispersed without causing disorderly splashing of the foamed slag, thereby improving the slag discharge effect of the slag foaming device.

[0048] For example, the air pressure of the pressurized airflow can be 0.1MPa, 0.3MPa, 0.5MPa, 0.7MPa, 0.9MPa, or 1.0MPa.

[0049] Optionally, such as Figure 1 As shown, the feed port 12 and the slag outlet 13 are spaced apart by a predetermined distance along the direction of the first axis. Figure 1 As shown, the feed port 12 is located near the left end of the furnace body 1, and the slag outlet 13 is located near the right side of the middle of the furnace body 1, which improves the rationality of the arrangement of the feed port 12 and the slag outlet 13.

[0050] like Figure 1 As shown, the feeding port 12 also has at least one function as a flue gas inlet and a secondary air inlet. Exemplarily, the flue gas inlet and the secondary air inlet of the furnace body 1 share a single port with the feeding port 12, which simplifies the structure of the furnace body 1 and facilitates its processing and manufacturing.

[0051] Optionally, such as Figure 1 As shown, there are multiple first spray guns 31 and multiple second spray guns 32, and the multiple first spray guns 31 and multiple second spray guns 32 are arranged at intervals along the first axis. Thus, under the synergistic effect of the first spray guns 31 and the second spray guns 32, the melt in the furnace 11 forms a "swirling + bubbling" composite flow field with dual agitation, resulting in more uniform foaming of the slag and a higher slag-iron separation rate.

[0052] In other examples, a number of first spray guns 31 and a number of second spray guns 32 may be located at both ends (left or right) of the furnace body 1 in the axial direction.

[0053] Optionally, the first spray gun 31 introduces a first oxygen-containing gas into the furnace 11, and the second spray gun 32 introduces a second oxygen-containing gas into the furnace 11. The oxygen concentration of the first oxygen-containing gas is between 21% and 99.6%, and the flow rate of the first oxygen-containing gas is 900 Nm³. 3 / h-1100Nm 3 The oxygen concentration of the second oxygen-containing gas is between 21% and 99.6% per hour, and the flow rate of the second oxygen-containing gas is 700 Nm³ / h. 3 / h-900Nm 3 / h. This allows for better foaming of the slag and a faster reaction rate.

[0054] like Figure 1 and Figure 2 As shown, the drive mechanism 2 includes a drive motor 21, a support roller 22, and a gear ring 23. The gear ring 23 is sleeved on the outer periphery of the furnace body 1. The drive motor 21 drives the gear to rotate, and the gear meshes with the gear ring 23 to drive the furnace body 1 to rotate. The support roller 22 is located on the lower side of the furnace body 1 to provide rotational support for the furnace body 1.

[0055] like Figure 3 As shown, the inner wall of the furnace 11 is provided with a refractory layer 14, which can directly contact the high-temperature slag. The refractory layer 14 has high refractoriness, erosion resistance and thermal stability, thereby reducing the erosion and wear of the furnace body 1 and extending the service life of the furnace body 1.

[0056] like Figure 3 As shown, another embodiment of the waste heat recovery device of the present invention includes: a slag foaming device and a waste heat recovery device. The slag foaming device is the slag foaming device of the present invention. The waste heat recovery device includes a radiant heat exchange chamber 5 and a flue gas heat exchange chamber 6. The slag outlet 13 is connected to one end of the radiant heat exchange chamber 5, and the other end of the radiant heat exchange chamber 5 is connected to the flue gas heat exchange chamber 6. A first conveyor 71 is provided on the lower side of the radiant heat exchange chamber 5, and a second conveyor 72 is provided on the lower side of the flue gas heat exchange chamber 6.

[0057] According to an embodiment of the waste heat recovery device of the present invention, since the driving mechanism 2 can drive the furnace body 1 to rotate around the first axis, the nozzle of the first spray gun 31 is located on the side of the furnace chamber 11, and the nozzle of the second spray gun 32 is located at the bottom of the furnace chamber 11, oxygen-containing gas is introduced into the furnace chamber 11, thereby promoting the stirring, heating, and oxidative foaming of the slag. Since the slag granulation mechanism 4 can spray pressurized airflow toward the foamed slag overflowing from the slag outlet 13, the overflowing foamed slag can be dispersed, facilitating the subsequent recovery of heat from the foamed slag. Therefore, the waste heat recovery device of the embodiment of the present invention can uniformly stir the slag, achieve a high degree of foaming, which is beneficial to improving the slag-iron separation rate and facilitates the subsequent recovery of heat from the foamed slag.

[0058] In addition, since the slag outlet 13 is connected to one end of the radiant heat exchange chamber 5 and the other end of the radiant heat exchange chamber 5 is connected to the flue gas heat exchange chamber 6, the foamy slag discharged from the slag outlet 13 can first enter the radiant heat exchange chamber 5 for heat exchange, and then the flue gas can be introduced into the flue gas heat exchange chamber 6 for heat exchange again, thereby improving the waste heat utilization rate of the slag.

[0059] Understandably, the first conveyor 71 can discharge the foam residue falling into the lower side of the radiant heat exchange chamber 5, so that the radiant heat exchange chamber 5 can operate continuously without interruption. The second conveyor 72 can discharge the flue gas dust falling into the lower side of the flue gas heat exchange chamber 6, so that the flue gas heat exchange chamber 6 can operate continuously without interruption.

[0060] Optionally, the top of the radiant heat exchange chamber 5 is provided with a liquid-cooled heat exchange wall 51, and at least one of the sides and bottom of the radiant heat exchange chamber 5 is provided with an air vent 52 for introducing agitated airflow into the radiant heat exchange chamber. Under the synergistic effect of the agitated airflow blown out of the air vent 52 and the pressurized airflow blown out of the slag granulation mechanism 4, the residence time of the slag in the air in the radiant heat exchange chamber 5 can be extended, increasing the heat dissipation area of ​​the slag and allowing the high-temperature slag to exchange heat with the air more fully. This allows the liquid-cooled heat exchange wall 51 to fully absorb the heat from the high-temperature slag.

[0061] like Figure 3 As shown, a water mist spraying mechanism 53 is provided on the top of the radiant heat exchange chamber 5. The water mist spraying mechanism 53 includes multiple water mist nozzles, which are arranged at intervals along the length of the radiant heat exchange chamber 5. The water mist nozzles are used to spray water mist into the radiant heat exchange chamber 5. This allows the high-temperature slag to exchange heat more fully with the water mist and air, so that the liquid-cooled heat exchange wall 51 can fully absorb the heat from the high-temperature slag.

[0062] like Figure 3 As shown, there are multiple air vents 52, which are arranged at intervals along the length of the radiant heat exchange chamber 5 and in the vertical direction of the radiant heat exchange chamber 5. It can be understood that the airflow discharged from the air vents 52 is ejected in a lateral and downward direction to prolong the falling time of the foam slag, so that the high-temperature slag can more fully exchange heat with the air and water mist.

[0063] like Figure 3 As shown, the waste heat recovery equipment also includes a slag bin 73, which is located at at least one end of the first conveyor 71 along its extension direction. For example, slag bins 73 are provided at both ends of the first conveyor 71's extension direction. The slag in the radiant heat exchange chamber 5 falls into the first conveyor 71 and flows into the slag bin 73 so that the slag can be used in the mineral processing stage for magnetic separation of iron concentrate and gravity separation of residual copper / nickel.

[0064] like Figure 3 As shown, the flue gas is sent to the desulfurization and dust removal system after recovering waste heat through the radiant heat exchanger 5 and the flue gas heat exchanger 6. The flue dust is sent to the mineral processing system after being enriched and recovered in the second stage.

[0065] For example, the first conveyor 71 is a chain conveyor and the second conveyor 72 is a scraper conveyor.

[0066] Optionally, a liquid-cooled heat exchanger 61 is provided inside the flue gas heat exchange chamber 6. The liquid-cooled heat exchanger 61 extends in the vertical direction, and its upper end is connected to the top wall of the flue gas heat exchange chamber. The liquid-cooled heat exchanger 61 can exchange heat with the high-temperature flue gas to recover heat from the high-temperature flue gas.

[0067] For example, the flue gas heat exchange chamber 6 is provided with a plurality of liquid-cooled heat exchangers 61, which are arranged at intervals along the length of the flue gas heat exchange chamber 6, thereby further improving the waste heat recovery rate of the flue gas.

[0068] like Figure 3 As shown, an embodiment of the waste heat recovery device of the present invention is described below.

[0069] The furnace body 1 has a diameter of 5m and a length of 10m. There are 16 first spray guns 31 and 6 second spray guns 32. The multiple first spray guns 31 and multiple second spray guns 32 are arranged at intervals along the first axis.

[0070] Copper smelting slag (Cu: 0.2-0.5%, FeO·SiO2: 50%) at 1450℃ is added to the furnace 11 through the feed port 12 via the chute 8. The drive mechanism 2 is started to rotate the furnace body 1 at a speed of 3 r / min. At the same time, oxygen-enriched air with an oxygen concentration of 75% (flow rate 1000 Nm³) is blown in through the first spray gun 31 of the injection mechanism 3. 3 / h), the second spray gun 32 blows in oxygen-enriched air with an oxygen concentration of 55% (flow rate 800Nm). 3 Under the action of swirling and bubbling, FeO·SiO2 in the slag is rapidly oxidized and foamed, and the foaming rate reaches 80% after 30 minutes.

[0071] The furnace body 1 is tilted to 3° to allow the foamy slag to be continuously discharged through the slag outlet 13. At this time, the slag granulation mechanism 4 is activated, with the tuyeres arranged at a 15° angle to the horizontal direction. A high-speed airflow with a wind pressure of 0.6 MPa is used to disperse and cool the foamy slag. Air is blown through the bottom and side vents 52 of the radiant heat exchange chamber 5 to achieve heat exchange between the hot slag and the cold air. After granulation, the slag temperature drops to 320°C (stage heat exchange, with the final slag temperature reaching around 300°C). The granulated slag is conveyed to the slag bin 73 by the first conveyor 71 with a plate width of 2500 mm, and then sent for further mineral processing. Residual copper is recovered through gravity separation, and iron concentrate is obtained through magnetic separation.

[0072] The liquid-cooled heat exchange wall 51 (membrane water-cooled wall) in the radiant heat exchange chamber 5 has a water-cooled tube spacing of 50mm, 5256 side air vents, and 5328 water mist spray mechanisms. The heat exchange area in the flue gas heat exchange chamber 6 is 200m². 2The high-temperature process flue gas, after exchanging heat with the slag, enters the flue gas heat exchange chamber 6. After exchanging heat with the liquid-cooled heat exchanger 61, its temperature drops to 320℃. The boiler water in the liquid-cooled heat exchanger 61 in the flue gas heat exchange chamber 6 is heated to generate steam, thereby recovering the heat from the flue gas. The overall process achieves an iron recovery rate of approximately 85%, a copper recovery rate of approximately 80%, and a waste heat recovery efficiency of 70%.

[0073] Another embodiment of the waste heat recovery device of the present invention is described below.

[0074] The furnace body 1 has a diameter of 6m and a length of 12m. There are 20 first spray guns 31 and 8 second spray guns 32. The multiple first spray guns 31 and multiple second spray guns 32 are arranged at intervals along the first axis.

[0075] Copper smelting slag (Cu: 0.2-0.5%, FeO·SiO2: 50%) at 1450℃ is added to the furnace 11 through the feed port 12 via the chute 8. The drive mechanism 2 is started to rotate the furnace body 1 at a speed of 3 r / min. At the same time, oxygen-enriched air with an oxygen concentration of 85% (flow rate 1000 Nm³) is blown in through the first spray gun 31 of the injection mechanism 3. 3 / h), the second spray gun 32 blows in oxygen-enriched air with an oxygen concentration of 55% (flow rate 800Nm). 3 Under the action of swirling and bubbling, FeO·SiO2 in the slag rapidly oxidizes and foams, and the foaming rate reaches 85% after 25 minutes.

[0076] The furnace body 1 is tilted to 3° to allow the foamy slag to be continuously discharged through the slag outlet 13. At this time, the slag granulation mechanism 4 is activated, with the tuyeres arranged at a 15° angle to the horizontal direction. A high-speed airflow with a wind pressure of 0.65 MPa is used to disperse and cool the foamy slag. Air is blown through the bottom and side air vents 52 of the radiant heat exchange chamber 5 to achieve heat exchange between the hot slag and the cold air. After granulation, the slag temperature drops to 320°C. The granulated slag is conveyed to the slag bin 73 by the first conveyor 71 with a plate width of 3000 mm, and sent for further mineral processing. Residual copper is recovered by gravity separation, and iron concentrate is obtained by magnetic separation.

[0077] The liquid-cooled heat exchange wall 51 (membrane water-cooled wall) in the radiant heat exchange chamber 5 has a water-cooled tube spacing of 50mm, 5225 side vents, and 5210 top vents. The heat exchange area in the flue gas heat exchange chamber 6 is 300m². 2 The high-temperature process flue gas, after exchanging heat with the slag, enters the flue gas heat exchange chamber 6. After exchanging heat with the liquid-cooled heat exchanger 61, the temperature drops to 300℃, heating the cold air to 280℃. Ultimately, the iron recovery rate is approximately 87%, the copper recovery rate is approximately 85%, and the waste heat recovery efficiency reaches 80%.

[0078] Another embodiment of the waste heat recovery device of the present invention is described below.

[0079] The furnace body 1 has a diameter of 5m and a length of 10m. There are 16 first spray guns 31 and 6 second spray guns 32. The multiple first spray guns 31 and multiple second spray guns 32 are arranged at intervals along the first axis.

[0080] Nickel smelting slag (Ni: 0.5-1.5%, FeO·SiO2: 45%) at 1450℃ is added to the furnace 11 through the feed port 12 via the chute 8. The drive mechanism 2 is started to rotate the furnace body 1 at a speed of 3 r / min. At the same time, oxygen-enriched air with an oxygen concentration of 85% (flow rate 800 Nm³) is blown in through the first spray gun 31 of the injection mechanism 3. 3 / h), the second spray gun 32 blows in oxygen-enriched air with an oxygen concentration of 55% (flow rate 800Nm). 3 Under the action of swirling and bubbling, FeO·SiO2 in the slag rapidly oxidizes and foams, and the foaming rate reaches 85% after 40 minutes.

[0081] The furnace body 1 is tilted to 2.5° to allow the foamy slag to be continuously discharged through the slag outlet 13. At this time, the slag granulation mechanism 4 is activated, with the tuyeres arranged at a 15° angle to the horizontal direction. A high-speed airflow with a wind pressure of 0.8 MPa is used to disperse and cool the foamy slag. Air is blown through the bottom and side air vents 52 of the radiant heat exchange chamber 5 to achieve heat exchange between the hot slag and the cold air. After granulation, the slag temperature drops to 280°C. The granulated slag is conveyed to the slag bin 73 by the first conveyor 71 with a plate width of 2500 mm, and then sent for further mineral processing, where iron concentrate is obtained through magnetic separation.

[0082] The liquid-cooled heat exchange wall 51 (membrane water-cooled wall) in the radiant heat exchange chamber 5 has a water-cooled tube spacing of 50mm, 5220 side vents, and 528 top vents. The heat exchange area in the flue gas heat exchange chamber 6 is 150m². 2 After the flue gas enters the radiant heat exchange chamber 5, the liquid-cooled heat exchange wall 51 absorbs radiant heat to generate saturated steam. After the flue gas passes through the liquid-cooled heat exchanger 61 in the flue gas heat exchange chamber 6, the temperature drops to 320°C, heating the cold air to 260°C. The final iron recovery rate is approximately 85%.

[0083] The waste heat recovery device of the present invention has at least the following technical effects:

[0084] (1) Dynamic furnace body 1 design. The furnace body 1 of the present invention can rotate at a variable frequency and lock at any tilt angle, and adjust the thickness of the slag layer and the height difference between the bottom edge of the slag outlet 13 in real time to achieve continuous and stable discharge of foam slag "expansion-overflow".

[0085] (2) Multi-stage injection design. The injection mechanism 3 of the present invention supplies air in two zones on the side and bottom of the furnace 11. The side-blowing spray gun (first spray gun 31) and the bottom-blowing spray gun (second spray gun 32) form a "swirling + bubbling" composite flow field with double stirring, resulting in uniform foaming and high slag-iron separation rate.

[0086] (3) Multi-stage enhanced heat transfer and waste heat utilization. This invention achieves efficient heat exchange between hot slag and air / water by using compressed air to disperse and granulate the slag, and by bottom and side air injection and top air injection, thus making full use of the sensible heat of the molten slag and improving the waste heat recovery efficiency.

[0087] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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.

[0088] 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 at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0089] 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0090] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0091] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0092] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A slag foaming device, characterized by, The application relates to a slag granulation device and a waste heat recovery device. The application relates to a slag granulation device and a waste heat recovery device. The application relates to a slag granulation device and a waste heat recovery device. The application relates to a slag granulation device and a waste heat recovery device. The application relates to a slag granulation device and a waste heat recovery device.

2. The slag foaming device according to claim 1, characterized in that The application relates to a slag granulation device and a waste heat recovery device.

3. The slag foaming device according to claim 1, characterized in that The application relates to a slag granulation device and a waste heat recovery device. The application relates to a slag granulation device and a waste heat recovery device.

4. The slag foaming device according to claim 1, characterized in that The first lance (31) supplies a first oxygen-containing gas to the furnace (11), the second lance (32) supplies a second oxygen-containing gas to the furnace (11), the oxygen concentration of the first oxygen-containing gas is between 21%-99.6%, the flow rate of the first oxygen-containing gas is between 900 Nm 3 / h-1100 Nm 3 / h, the oxygen concentration of the second oxygen-containing gas is between 21%-99.6%, the flow rate of the second oxygen-containing gas is between 700 Nm 3 / h-900 Nm 3 / h.

5. A heat recovery apparatus characterized by comprising: The application relates to a slag granulation device and a waste heat recovery device. The application relates to a slag granulation device and a waste heat recovery device. The application relates to a slag granulation device and a waste heat recovery device.

6. The heat recovery apparatus according to claim 5, characterized by The application relates to a slag granulation device and a waste heat recovery device. The application relates to a slag granulation device and a waste heat recovery device. The application relates to a slag granulation device and a waste heat recovery device. The application relates to a slag granulation device and a waste heat recovery device. The application relates to a slag granulation device and a waste heat recovery device. The application relates to a slag granulation device and a waste heat recovery device. The application relates to a slag granulation device and a waste heat recovery device. The application relates to a slag granulation device and a waste heat recovery device. The application relates to a slag granulation device and a waste heat recovery device. The application relates to a slag granulation device and a waste heat recovery device. 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7. The heat recovery apparatus according to claim 6, characterized by A water mist spraying mechanism (53) is arranged on the top of the radiation heat exchange chamber (5), the water mist spraying mechanism (53) comprises a plurality of water mist nozzles, the plurality of water mist nozzles are arranged at intervals along the length direction of the radiation heat exchange chamber (5), and the water mist nozzles are used for spraying water mist into the radiation heat exchange chamber (5).

8. The heat recovery apparatus according to claim 6, characterized by The wind eye (52) is a plurality of wind eyes (52), and the plurality of wind eyes (52) are arranged at intervals along the length direction of the radiation heat exchange chamber (5) and the up-down direction of the radiation heat exchange chamber (5).

9. The heat recovery apparatus according to claim 5, characterized by The waste heat recovery device further comprises a slag bin (73), the slag bin (73) is arranged at least one end of the first conveyor (71) along the extension direction of the first conveyor (71). And / or, the first conveyor (71) is a chain plate conveyor, and the second conveyor (72) is a scraper conveyor.

10. The heat recovery apparatus according to claim 5, characterized by The flue gas heat exchange chamber (6) is provided with a liquid cooling heat exchanger (61), the liquid cooling heat exchanger (61) extends along the up-down direction, and the upper end of the liquid cooling heat exchanger (61) is connected with the top wall of the flue gas heat exchange chamber. And / or, the flue gas heat exchange chamber (6) is provided with a plurality of liquid cooling heat exchangers (61), and the plurality of liquid cooling heat exchangers (61) are arranged at intervals along the length direction of the flue gas heat exchange chamber (6).

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