Copper smelting slag air cooling and heat recovery system

Abstract

The utility model provides a copper smelting slag air cooling and heat recovery system, and belongs to the field of nonferrous metallurgy. The system comprises a closed plant and a cinder ladle position, a plurality of cinder ladle positions are arranged in the plant, each cinder ladle position is provided with a cinder ladle, a tube panel and a graphite stirrer are correspondingly hung above each cinder ladle, the tube panel is a horizontally arranged mosquito-repellent incense coil type water tube, the graphite stirrer vertically penetrates into the cinder ladle from a central gap of the tube panel, and the graphite stirrer is arranged in the cinder ladle. The tube panel is also provided with a water inlet and a water outlet and is connected with an external circulating water system; according to the system, the cooling speed of the cinder ladle is reduced through a simple closed plant, melt stirring is conducted through a graphite stirrer to promote mutual collision of copper matte particles, heat radiation of the cinder ladle is absorbed through a tube panel connected with an external circulating water system, and the dual effects of promoting growth of the copper matte particles and recycling air cooling heat of the cinder ladle are achieved; the method has the advantages of low cost, simple implementation steps, good heat recovery effect and the like, and has a wide industrialization prospect.

Description

Technical Field

[0001] The utility model relates to a copper smelting slag air-cooling and heat recovery system, belonging to the field of non-ferrous metallurgy. Background Art

[0002] Copper smelting slag is an "artificial ore", which is a complex aggregate formed by chemical combination and physical adhesion with iron, silicon, magnesium and other substances under high temperature conditions. Its properties not only depend on the raw material composition and operating conditions of pyrometallurgy, but also depend on the slag cooling method and cooling system.

[0003] At present, copper smelting slag is generally processed according to the procedures of slow cooling, crushing and grinding, separation, and dewatering to further recover copper in the slag. The air cooling of copper smelting slag is a crucial step in the slow cooling process. The air cooling of copper smelting slag is a process of naturally cooling the slag ladle filled with high-temperature molten slag in the air to eliminate the thermal stress of the slag ladle, avoid cracking of the slag ladle caused by sudden cooling, and improve the process safety. At this stage, slowing down the cooling rate of the slag ladle and allowing the grain size of the copper matte to grow in the liquid state is of great significance for promoting copper recovery in the subsequent flotation stage. At the same time, as an energy source with a large amount of high-temperature calorific value, recovering the heat energy of the slag ladle is crucial for enhancing energy utilization efficiency and reducing carbon dioxide emissions. Chinese Patent CN118256732A discloses a high-temperature copper slag treatment system and its slag ladle cover device. The device includes a slag ladle cover, a water-cooled wall, and a heat pipe assembly. Among them, the water-cooled wall and the heat pipe assembly are arranged inside the slag ladle cover. The system uses the slag ladle cover to cover the slag ladle, reduces the temperature of the slag ladle by blowing cooling air, and at the same time absorbs the heat of the high-temperature copper slag through the water-cooled wall with flowing cooling water by radiation heat transfer. Although the system can effectively recover the waste heat of the slag ladle, due to reasons such as complex equipment structure and high implementation cost, its use is greatly restricted. Chinese Patent CN216039761U discloses a copper smelting slag ladle heat preservation and cooling device. The device includes a slag ladle trough for accommodating the slag ladle and a trough cover adapted to the slag ladle trough. The side wall of the slag ladle trough is also provided with a water inlet, a water outlet, and an overflow port. The height of the overflow port is higher than that of the water inlet and the water outlet. Although the device can play a certain role in slowing down the cooling rate of the slag ladle, there is still a problem of poor heat preservation effect of the slag ladle caused by the separate storage of the slag ladle. In addition, the device stores the slag ladle in the slag ladle trough, and there are obvious difficulties in transporting and placing the slag ladle in a high-temperature state. Chinese Patent CN216717032U discloses a copper smelting furnace slag waste heat recovery device. The device includes a slag ladle waste heat heat exchange recovery device body and a carrier trolley track. The outside of the slag ladle waste heat heat exchange recovery device body is connected with a water inlet pipe, and the slag ladle waste heat heat exchange recovery device body is connected with a make-up water pipe through the water inlet pipe. Although the device can achieve a certain effect of recovering the waste heat of the slag ladle and has the advantages of convenient transportation and placement of the slag ladle, since the slag ladle in the device is air-cooled in a traditional static manner, there are problems of uneven and insufficient growth of copper matte particles.

[0004] In summary, the current air-cooling treatment of copper smelting slag faces the following defects that urgently need to be improved: (1) In the existing technology, the air cooling of slag packages is often carried out by static placement in a slow-cooling site. During the static placement process, the copper matte particles may have problems such as uneven growth of copper matte particle crystal grains, small crystal grain sizes, and many copper metal and compound by-products due to insufficient collision between particles; (2) As an energy source with high calorific value, the slag package currently faces the problems of low heat energy recovery efficiency and high heat energy recovery cost. Solving the complex structure and high cost of the existing high-temperature copper slag treatment system is an important direction for the smelting industry to achieve the "dual carbon" sustainable development goal. Summary of the Invention

[0005] To solve the problems in the existing technology, the utility model provides a copper smelting slag air-cooling and heat recovery system. The system is provided with a graphite stirrer for melt stirring, which promotes the collision of copper particles with each other to promote the growth of copper matte particles during the air cooling process of the slag; the system also slows down the cooling rate of the slag package through a simple closed workshop, and uses a tube screen connected to an external circulating water system to absorb the thermal radiation of the slag package, which can effectively improve the disadvantages of high cost and large implementation difficulty of the existing high-temperature copper slag treatment and heat recovery system; the system has the dual functions of promoting the growth of copper matte particles and recovering the heat of the slag package during the air cooling process, with low cost, simple implementation steps, and good heat recovery effect, and has broad industrialization prospects.

[0006] The technical solution of the utility model is as follows:

[0007] A copper smelting slag air-cooling and heat recovery system, including a closed workshop and a slag package position, is characterized in that the top and the surrounding of the workshop are provided with heat-insulating closed surfaces; a plurality of slag package positions are arranged in the closed workshop; a slag package is arranged on each slag package position, and a tube screen and a graphite stirrer are respectively suspended above each slag package; the tube screen is a horizontally arranged mosquito-repellent incense plate-shaped water pipe; the graphite stirrer vertically penetrates into the slag package from the central gap of the tube screen; water inlets and outlets are respectively arranged at both ends of the tube screen; the water inlets and outlets are respectively connected to an external circulating water system by steel wire hoses; water flows through the tube screen, and the water flow in the tube screen can be heated by the thermal radiation of the slag package to realize heat recovery;

[0008] Further, the water inlet is located at the center of the tube screen, and the water outlet is located on the outer side of the tube screen;

[0009] Further, a lifting mechanism connected to the tube screen is arranged above the tube screen, which can flexibly adjust the distance between the tube screen and the slag package;

[0010] Further, a lifting mechanism is arranged at the upper end of the graphite stirrer, which can realize the lifting of the graphite stirrer;

[0011] Furthermore, the slag ladle positions are arranged flat in the workshop, which can effectively utilize the thermal radiation interaction between the slag ladles to promote the heat preservation effect; the distance between the upper edges of the slag ladles on adjacent slag ladle positions is 0.5 - 1 m, leaving space for the slag ladle transport vehicle to enter and exit.

[0012] The present utility model also provides a use of a copper smelting slag slow cooling and heat recovery system. This system adopts a strategy of centralized natural cooling of slag ladles, utilizes the heat of each slag ladle itself to form a heat preservation field, slows down the temperature drop rate of the slag during the natural cooling process, extends the growth time of copper matte particles in the liquid state, and at the same time, in cooperation with the stirring and collision effect of the graphite stirrer on the copper matte particles, can effectively promote the growth of copper matte particles, and can be applied to the copper metal recovery process of copper smelting slag.

[0013] Compared with the prior art, the advantages and beneficial effects of the present utility model are as follows:

[0014] 1. The present utility model uses a graphite stirrer to stir the liquid melt, increasing the collision probability of copper matte particles in the melt and promoting the growth of copper matte particles in the slag; the graphite stirrer is also provided with a lifting device to facilitate the entry and exit of the slag ladle.

[0015] 2. The enclosed workshop can effectively slow down the heat dissipation rate of the slag ladle, increase the Brownian motion between internal particles, promote the growth of copper matte crystal particles, and is beneficial for subsequent separation; the slag ladle does not contact water during the air cooling process, with high safety, low requirements for the safety level of the site, and the number of slag ladle positions can be flexibly increased in the workshop, which can reduce the shortage of slag ladle positions in the slow cooling field and is of great significance for increasing the feeding amount of smelting slag.

[0016] 3. The tube screen for realizing heat recovery in the present utility model is also provided with a lifting device, which can flexibly adjust the distance between it and the slag ladle, and can realize the function switching between absorbing the thermal radiation of the slag ladle and facilitating the entry and exit of the slag ladle; by adjusting the distance between the tube screen and the slag ladle and the water volume and water temperature introduced into the tube screen, the ambient temperature above the slag ladle can be changed, and the cooling rate of the slag ladle can be regulated. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the enclosed workshop and slag ladle positions of the present utility model;

[0018] Figure 2 is a front view of the slag ladle, tube screen and graphite stirrer located on the slag ladle position of the present utility model;

[0019] Figure 3 is a top view of the slag ladle, tube screen and graphite stirrer located on the slag ladle position of the present utility model;

[0020] The reference numerals in the figures are respectively represented as:

[0021] 1. Workshop; 2. Slag ladle position; 3. Slag ladle; 4. Tube screen; 41. Water inlet; 42. Water outlet; 5. Graphite stirrer. Detailed implementation mode

[0022] The following further describes the present utility model in conjunction with the attached drawings and preferred embodiments. The provided embodiments are only for clarifying the present utility model and not for limiting the scope of the present utility model.

[0023] As Figures 1 to 3 shown, this embodiment provides a copper smelting furnace slag air-cooling and heat recovery system, including a closed workshop 1 and a plurality of slag ladle positions 2 arranged in the workshop 1; the top and the periphery of the workshop 1 are provided with a heat-insulating closed surface 11, and the heat-insulating closed surface can use heat-insulating materials to wrap the top and the periphery of the workshop 1; a slag ladle 3 is arranged on each slag ladle position 2, and a tube screen 4 and a graphite stirrer 5 are correspondingly suspended above each slag ladle 3; the tube screen 4 is a horizontally arranged mosquito coil-shaped water pipe; the graphite stirrer 5 vertically penetrates into the slag ladle 3 from the central gap of the tube screen 4; water inlets 41 and water outlets 42 are respectively arranged at both ends of the tube screen 4; the water inlets 41 and the water outlets 42 are respectively connected with an external circulating water system by steel wire hoses; water flows through the inside of the tube screen 4, and the water flow inside the tube screen 4 can be heated by the heat radiation of the slag ladle 3 to realize heat recovery.

[0024] In this embodiment, the water inlet 41 is located at the center of the tube screen 4, and the water outlet 42 is located on the outside of the tube screen 4. The water introduced from the outside flows through the water outlet 41 from the water inlet 41.

[0025] In this embodiment, a lifting mechanism is provided above the tube screen 4. The lifting mechanism can be an electric hoist or a hydraulic cylinder. In this embodiment, an electric hoist is used as the lifting mechanism, and the tube screen 4 is horizontally suspended by a steel wire rope to flexibly adjust the distance between the tube screen 4 and the slag ladle 3.

[0026] The graphite stirrer 5 adopted in this embodiment is a movable cantilever type graphite stirrer. A lifting mechanism is provided at the upper end of the graphite stirrer 5, which can realize the lifting of the graphite stirrer 5 and then extend into the slag ladle 3 for stirring the melt in the slag ladle 3.

[0027] In this embodiment, the slag ladle positions 2 can be flexibly arranged in the workshop 1 according to the actual number of slag ladles 3. The slag ladle positions 2 are arranged flat in the workshop 1, and the upper edge distance between the slag ladles 3 is 0.5 m, which is convenient for the vehicles transporting the slag ladles 3 to enter and exit.

[0028] The working principle of this embodiment is as follows:

[0029] When using the present utility model for air cooling and heat recovery of copper smelting slag, first use the slag ladle 3 transport vehicle to transport the slag ladle 3 to the slag ladle position 2, and enclose the workshop 1; lower the tube screen 4 with circulating water to above the slag ladle 3, keep a relatively close distance from the hot slag to absorb heat radiation, then move the movable cantilever graphite stirrer 5 to a suitable position, vertically penetrate the graphite stirrer 5 into the slag ladle 3 from the central gap of the tube screen 4, and stir the melt for 60 minutes to promote the mutual collision of copper matte particles; the slag ladle 3 stays in the workshop 1 for more than 6 hours and is naturally cooled in the air, then raise the graphite stirrer 5 and the tube screen 4 with circulating water above the slag ladle 3 in sequence, open the workshop 1, and transport the slag ladle 3 out.

[0030] The present utility model adopts the strategy of centralized natural cooling of the slag ladle 3, utilizes the heat of each slag ladle 3 itself to form a heat preservation field, slows down the temperature drop rate of the slag during the natural cooling process, and at the same time cooperates with the stirring action of the graphite stirrer 5 on the copper matte particles, which can effectively promote the growth of metal particles and is beneficial to the subsequent flotation process; the tube screen 4 with circulating water provided in the air cooling and heat recovery system of copper smelting slag provided by the present utility model absorbs the heat radiation during the air cooling process of the slag ladle 3 by means of heat conduction, and realizes the waste heat recovery of the slag ladle 3.

[0031] Finally, it should be noted that the above are only the preferred examples of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A copper smelting slag air-cooling and heat recovery system, comprising a closed workshop (1) and a plurality of slag ladle positions (2) arranged in the workshop (1), characterized in that, The top and the periphery of the plant building (1) are provided with heat-insulating closed surfaces (11); a slag ladle (3) is arranged at each slag ladle position (2), and a tube screen (4) and a graphite stirrer (5) are correspondingly suspended above each slag ladle (3); the tube screen (4) is a horizontally arranged mosquito-repellent incense plate-shaped water pipe; the graphite stirrer (5) vertically penetrates into the slag ladle (3) from the central gap of the tube screen (4); water inlets (41) and water outlets (42) are respectively arranged at two ends of the tube screen (4); the water inlets (41) and the water outlets (42) are respectively connected with an external circulating water system.

2. The copper smelting slag air-cooling and heat recovery system according to claim 1, wherein The water inlet (41) is located at the center of the tube screen (4), and the water outlet (42) is located outside the tube screen (4).

3. The copper smelting slag air-cooling and heat recovery system according to claim 1, characterized in that, A lifting mechanism connected thereto is arranged above the tube screen (4).

4. The copper smelting slag air cooling and heat recovery system according to claim 1, wherein A lifting mechanism is arranged at the upper end of the graphite stirrer (5).

5. The copper smelting slag air-cooling and heat recovery system according to claim 1, characterized in that, The slag ladle positions (2) are laid flat in the plant building (1), and the upper edge distance between the slag ladles (3) on adjacent slag ladle positions (2) is 0.5 - 1 m.

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