Copper smelting slag waste heat recovery process and copper smelting slag waste heat recovery device

Abstract

The invention discloses a copper smelting slag waste heat recovery process and a copper smelting slag waste heat recovery device, and relates to the technical field of copper smelting slag waste heat recovery. The copper smelting slag waste heat recovery process comprises the steps that high-temperature molten smelting slag is poured into a slag ladle, the slag ladle is placed in a slag ladle groove, and the temperature of the slag ladle is reduced to a first temperature; water is sprayed to the cinder ladle through the water spraying device; collecting medium-temperature steam through the air extractor, wherein the medium-temperature steam is formed when water sprayed by the water spraying device encounters the cinder ladle; and collecting first heat exchange liquid through the collecting device, wherein the first heat exchange liquid is liquid which is not evaporated after water sprayed by the water spraying device encounters the cinder ladle. According to the technical scheme provided by the invention, spraying is carried out on the slag ladle, the slag ladle transfers heat into water sprayed by the water spraying device, then high-temperature liquid and gas are collected for utilization, and the technical effect of recycling waste heat of the copper smelting slag is achieved.

Description

Technical Field

[0001] This invention relates to the field of copper smelting slag waste heat recovery technology, and particularly to a copper smelting slag waste heat recovery process and a copper smelting slag waste heat recovery device. Background Technology

[0002] Copper, as a strategic metal, is listed by the United Nations as one of the seven "critical minerals for global energy transition." It is a fundamental raw material supporting the stability of industrial chains and is mainly used in power, home appliances, transportation, and communications. Copper's electrical conductivity, ductility, and corrosion resistance make it an irreplaceable material in the energy transition. my country is a major consumer of copper resources, and with the rapid development of industries such as electric vehicles, photovoltaics, robotics, and data centers, the demand for copper will steadily increase in the future. In 2024, my country's refined copper production reached 13.64 million tons. For every ton of refined copper produced, 2-3 tons of copper smelting slag are generated, resulting in an annual output of 27-41 million tons of copper smelting slag. The tapping temperature of copper smelting slag is generally 1300℃, and its calorific value is approximately 1.13 GJ / ton, equivalent to the calorific value of 49 kg of coal (5500 kcal).

[0003] Currently, a large amount of heat released during the cooling process of high-temperature copper smelting slag is not being effectively utilized. In order to reduce energy waste, it is urgent to realize the utilization of waste heat from high-temperature copper smelting slag. Summary of the Invention

[0004] The main objective of this invention is to propose a process and device for recovering waste heat from copper smelting slag, aiming to provide a process for recovering and utilizing the residual heat of copper smelting slag.

[0005] A copper smelting slag waste heat recovery device recovers and utilizes the waste heat of copper smelting slag. The copper smelting slag waste heat recovery device includes: a slag bag, a slag bag tank, an air extractor, and a water spraying device. The slag bag is used to hold the high-temperature molten smelting slag. The slag bag tank has a cavity for placing the slag bag. The air extractor is connected to the cavity. The water spraying device is positioned towards the slag bag. The copper smelting slag waste heat recovery process includes: The molten smelting slag at high temperature is poured into a slag bag, the slag bag is placed in the slag bag tank, and the temperature of the slag bag is reduced to a first temperature; Water is sprayed onto the slag bag using the water spraying device; Medium-temperature steam is collected by the pump, and the medium-temperature steam is formed by the water sprayed by the water spraying device meeting the slag bag; The first heat exchange liquid is collected by the collection device. The first heat exchange liquid is the liquid that is not evaporated after the water sprayed by the water spraying device comes into contact with the slag bag.

[0006] In one embodiment, the step of spraying water onto the slag bag using the water spraying device includes: The water spraying device sprays for a first preset time period, and then sprays again after a second preset time period.

[0007] In one embodiment, the copper smelting slag waste heat recovery device further includes a plurality of first heat exchange tubes, which are connected to the air extraction fan. After the step of collecting medium-temperature steam via the pump, and the medium-temperature steam being formed by the water sprayed from the water spraying device encountering the slag bag, the method further includes: Multiple insertion holes are drilled on the surface of the slag bag, and multiple first heat exchange tubes are respectively inserted into the multiple insertion holes. The medium-temperature steam exchanges heat with the slag bag through the first heat exchange tubes to form high-temperature steam.

[0008] In one embodiment, the water spraying device further includes a second heat exchange tube, which is disposed at the bottom of the slag bag tank and is used to exchange heat with the slag bag; After the step of collecting the first heat exchange liquid through the collection device, wherein the first heat exchange liquid is the liquid that has not evaporated after the water sprayed by the water spraying device encounters the slag bag, the method further includes: Cooling water is injected into the second heat exchange tube, and heat is exchanged between the second heat exchange tube and the slag bag to form a second heat exchange liquid.

[0009] In one embodiment, after the step of injecting cooling water into the second heat exchange tube and forming a second heat exchange liquid through heat exchange with the slag bag via the second heat exchange tube, the method further includes: The first heat exchange liquid is mixed with the second heat exchange liquid so that the temperature of the mixed liquid is within a preset temperature range.

[0010] In one embodiment, the steps of pouring molten smelting slag at high temperature into a slag bag, placing the slag bag in the slag bag trough, and lowering the temperature of the slag bag to a first temperature include: First steam is introduced into the cavity. The temperature of the first steam is greater than 100 degrees Celsius, so that the temperature drop rate v of the slag bag is 2.5℃ / min ≥ v ≥ 2℃ / min.

[0011] The present invention also proposes a waste heat recovery device for copper smelting slag, comprising: Slag pouch, used to hold molten smelting slag at high temperatures; A slag bag trough has a cavity, the cavity being used to place the slag bag; An air extraction device is connected to the cavity; A water spray device is positioned towards the slag bag.

[0012] In one embodiment, the copper smelting slag waste heat recovery device further includes a steam homogenization device, which is connected to a plurality of the first heat exchange tubes.

[0013] In one embodiment, the copper smelting slag waste heat recovery device further includes a temperature sensor installed inside the cavity for detecting the temperature of the slag bag.

[0014] In one embodiment, the copper smelting slag waste heat recovery device further includes a control device, which is electrically connected to the air pump, the water spray device, and the temperature sensor.

[0015] The technical solution of this invention achieves the technical effect of recovering and utilizing the residual heat of copper smelting slag by spraying water onto the slag bag, which transfers the heat of the slag bag to the water sprayed by the water spraying device, and then collecting and utilizing the high-temperature liquid and gas. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic flow diagram of the first embodiment of the copper smelting slag waste heat recovery process provided by the present invention. Figure 2 This is a schematic flow diagram of a second embodiment of the copper smelting slag waste heat recovery process provided by the present invention. Figure 3 A schematic flow chart of the third embodiment of the copper smelting slag waste heat recovery process provided by the present invention; Figure 4 A schematic flow diagram of the fourth embodiment of the copper smelting slag waste heat recovery process provided by the present invention; Figure 5 A schematic flow diagram of the fifth embodiment of the copper smelting slag waste heat recovery process provided by the present invention; Figure 6 A schematic flow diagram of the sixth embodiment of the copper smelting slag waste heat recovery process provided by the present invention; Figure 7 This is a schematic diagram of an embodiment of the copper smelting slag waste heat recovery device provided by the present invention.

[0018] Explanation of icon numbers: 100. Copper smelting slag waste heat recovery device; 1. Slag bag; 2. Slag bag tank; 3. Evacuator; 4. Water spray device; 5. First heat exchange tube; 6. Second heat exchange tube; 7. Steam homogenization device.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] Currently, a large amount of heat released during the cooling process of high-temperature copper smelting slag is not being effectively utilized. In order to reduce energy waste, it is urgent to realize the utilization of waste heat from high-temperature copper smelting slag.

[0024] This invention proposes a waste heat recovery device for copper smelting slag.

[0025] Please see Figure 1 and Figure 7 , Figure 1 This is a schematic flow diagram of a first embodiment of a copper smelting slag waste heat recovery process according to the present invention. This copper smelting slag waste heat recovery process is used to recover and utilize the waste heat of copper smelting slag through a copper smelting slag waste heat recovery device 100. The copper smelting slag waste heat recovery device 100 includes: a slag bag 1, a slag bag tank 2, an air extractor 3, and a water spraying device 4. The slag bag 1 is used to hold the high-temperature molten smelting slag; the slag bag tank 2 has a cavity for placing the slag bag 1; the air extractor 3 is connected to the cavity; and the water spraying device 4 is positioned towards the slag bag 1. The copper smelting slag waste heat recovery process includes: Step S1: Pour the high-temperature molten smelting slag into the slag bag 1, place the slag bag 1 in the slag bag tank 2, and reduce the temperature of the slag bag 1 to the first temperature; Step S2: Spray water onto the slag bag 1 using the water spraying device 4; Step S3: Collect medium-temperature steam through the vacuum pump 3. The medium-temperature steam is formed by the water sprayed by the water spraying device 4 meeting the slag bag 1. Step S4: Collect the first heat exchange liquid through the collection device. The first heat exchange liquid is the liquid that is not evaporated after the water sprayed by the water spraying device 4 comes into contact with the slag bag 1.

[0026] In the technical solution of this invention, the slag bag tank 2 has a main body and a cover, which together form the cavity. Opening the cover allows the slag bag 1 to be placed inside the slag bag tank 2, and closing the cover makes the cavity a sealed space for steam collection. To collect and utilize the heat from the copper smelting slag, it is necessary to transfer and collect the heat. Water is sprayed onto the slag bag 1; the water absorbs heat and forms steam, which is collected by a vacuum pump 3. Some of the sprayed liquid does not absorb enough heat and vaporizes, but due to brief contact with the slag bag 1, it also has a relatively high temperature. Therefore, the first heat exchange liquid with a higher temperature is located at the bottom of the slag bag tank 2. To collect the first heat exchange liquid, a conduit can be installed at the bottom of the slag bag tank 2 to lead the first heat exchange liquid out for collection.

[0027] Due to prolonged spraying, the surface temperature of slag bag 1 is low, which is not conducive to heat transfer, while the interior of slag bag 1 still has a high temperature.

[0028] Reference Figure 2 , Figure 2 This is a schematic flow diagram of the second embodiment of a copper smelting slag waste heat recovery process of the present invention.

[0029] Step S2 includes: Step S21: After the water spraying device 4 sprays for a first preset time period, it sprays again after an intermittent second preset time period.

[0030] Generally, the first preset time period is 6 to 8 minutes, and the second preset time period is 2 to 3 minutes. After spraying for a period of time, the surface temperature of the slag bag 1 becomes low, which is not conducive to heat exchange and the heat exchange efficiency is low. Therefore, spraying is stopped for a period of time to allow the temperature inside the slag bag 1 to be transferred to the surface of the slag bag 1, thereby raising the surface temperature of the slag bag 1. Then, the water spraying device 4 is turned on again for circulation.

[0031] In order to utilize steam, refer to Figure 3 , Figure 3 This is a schematic flow diagram of the third embodiment of a copper smelting slag waste heat recovery process of the present invention.

[0032] The copper smelting slag waste heat recovery device 100 also includes a plurality of first heat exchange tubes 5, which are connected to the air extraction machine 3. After step S3, the following is also included: Step S5: Drill multiple holes on the surface of the slag bag 1, and insert multiple first heat exchange tubes 5 into the multiple holes respectively. The medium-temperature steam exchanges heat with the slag bag 1 through the first heat exchange tubes 5 to form high-temperature steam.

[0033] Medium-temperature steam is introduced into the first heat exchange tube 5 and exchanges heat with the interior of the slag bag 1, which raises the temperature of the medium-temperature steam to form high-temperature steam. The temperature of the high-temperature steam exceeds 200°C and can be used for power generation.

[0034] The liquid sprayed by the water spraying device 4 can only come into contact with the upper and circumferential sides of the slag bag 1 for heat exchange, while the lower side of the slag bag 1 still has a higher temperature.

[0035] Reference Figure 4 , Figure 4 This is a schematic flow diagram of the fourth embodiment of a copper smelting slag waste heat recovery process of the present invention.

[0036] In one embodiment, the water spraying device 4 further includes a second heat exchange tube 6, which is disposed at the bottom of the slag bag tank 2 and is used to exchange heat with the slag bag 1; After step S4, the following also includes: Step S6: Inject cooling water into the second heat exchange tube 6, and exchange heat with the slag bag 1 through the second heat exchange tube 6 to form a second heat exchange liquid.

[0037] The second heat exchange tube 6 is located at the bottom of the slag bag tank 2 and on the outside of the slag bag tank 2. The heat from the slag bag 1 is transferred to the second heat exchange tube 6 through the bottom of the slag bag tank 2 to heat the cooling water.

[0038] In order to utilize heated water.

[0039] Reference Figure 5 , Figure 5 This is a schematic diagram of the fifth embodiment of a copper smelting slag waste heat recovery process of the present invention.

[0040] After step S6, the following is also included: Step S7: Mix the first heat exchange liquid with the second heat exchange liquid so that the temperature of the mixed liquid is within a preset temperature range.

[0041] The first heat exchange liquid has a higher temperature, while the second heat exchange liquid has a lower temperature. In order to keep the temperature of the heating liquid within the range of 70 to 80 degrees Celsius for heating purposes, the two liquids are mixed. The mixing ratio of the first and second heat exchange liquids can be controlled by setting a temperature sensor to detect the temperature of the mixed liquid.

[0042] Because copper smelting slag still contains copper, in order to recover the copper.

[0043] Reference Figure 6 , Figure 6 This is a schematic flow diagram of the sixth embodiment of a copper smelting slag waste heat recovery process of the present invention.

[0044] Step S1 includes: Step S11: Inject first steam into the cavity. The temperature of the first steam is greater than 100 degrees Celsius, so that the temperature drop rate v of the slag bag 1 is 2.5℃ / min ≥ v ≥ 2℃ / min.

[0045] By controlling the rate of temperature decrease, the high-temperature molten copper smelting slag is slowly cooled. This allows the dispersed micro-copper droplets or Cu₂S crystals within the slag sufficient time to diffuse, collide, and aggregate in the high-temperature environment, increasing the contact probability and duration, thus enabling the formation of larger copper crystal particles. In subsequent grinding-flotation processes, these larger copper crystal particles are more easily recovered, thereby improving the resource recovery rate of the copper smelting slag.

[0046] This invention also proposes a copper smelting slag waste heat recovery device 100. The copper smelting slag waste heat recovery process is implemented based on the copper smelting slag waste heat recovery device 100, and therefore has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The copper smelting slag waste heat recovery device 100 includes: a slag bag 1, a slag bag tank 2, an air extractor 3, and a water spraying device 4; the slag bag 1 is used to hold high-temperature molten smelting slag; the slag bag tank 2 has a cavity for placing the slag bag 1; the air extractor 3 is connected to the cavity; and the water spraying device 4 is positioned towards the slag bag 1.

[0047] To enable the high-temperature steam to be used for power generation, the copper smelting slag waste heat recovery device 100 also includes a steam homogenization device 7, which is connected to multiple first heat exchange tubes 5. Only after the high-temperature steam enters the steam homogenization device 7 and its pressure, temperature, and flow rate are homogenized can the high-temperature steam be used for power generation.

[0048] In order to detect the temperature of the slag bag 1 and the temperature of the mixed liquid, the copper smelting slag waste heat recovery device 100 also includes multiple temperature sensors, which can be used to detect the temperature of the slag bag 1 and the temperature of the mixed liquid respectively.

[0049] In order to control the cyclic operation of the water spray device 4 and the start and stop of the air extractor 3, and to control the temperature of the mixed liquid, the copper smelting slag waste heat recovery device 100 also includes a control device for regulation. The control device is electrically connected to the air extractor 3, the water spray device 4, and the temperature sensor respectively.

[0050] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A copper smelting slag waste heat recovery process, used to recover and utilize the waste heat of copper smelting slag through a copper smelting slag waste heat recovery device, characterized in that, The copper smelting slag waste heat recovery device includes: Slag pouch, used to hold molten smelting slag at high temperatures; A slag bag trough has a cavity, the cavity being used to place the slag bag; An air extraction device is connected to the cavity; A water spray device is positioned towards the slag bag; The copper smelting slag waste heat recovery process includes: The molten smelting slag at high temperature is poured into a slag bag, the slag bag is placed in the slag bag tank, and the temperature of the slag bag is reduced to a first temperature; Water is sprayed onto the slag bag using the water spraying device; Medium-temperature steam is collected by the pump, and the medium-temperature steam is formed by the water sprayed by the water spraying device meeting the slag bag; The first heat exchange liquid is collected by the collection device. The first heat exchange liquid is the liquid that is not evaporated after the water sprayed by the water spraying device comes into contact with the slag bag.

2. The copper smelting slag waste heat recovery process as described in claim 1, characterized in that, The step of spraying water onto the slag bag using the spraying device includes: The water spraying device sprays for a first preset time period, and then sprays again after a second preset time period.

3. The copper smelting slag waste heat recovery process as described in claim 1, characterized in that, The copper smelting slag waste heat recovery device also includes a plurality of first heat exchange tubes, which are connected to the air extraction machine. After the step of collecting medium-temperature steam via the pump, and the medium-temperature steam being formed by the water sprayed from the water spraying device encountering the slag bag, the method further includes: Multiple insertion holes are drilled on the surface of the slag bag, and multiple first heat exchange tubes are respectively inserted into the multiple insertion holes. The medium-temperature steam exchanges heat with the slag bag through the first heat exchange tubes to form high-temperature steam.

4. The copper smelting slag waste heat recovery process as described in claim 1, characterized in that, The water spraying device also includes a second heat exchange tube, which is disposed at the bottom of the slag bag tank and is used to exchange heat with the slag bag; After the step of collecting the first heat exchange liquid through the collection device, wherein the first heat exchange liquid is the liquid that has not evaporated after the water sprayed by the water spraying device encounters the slag bag, the method further includes: Cooling water is injected into the second heat exchange tube, and heat is exchanged between the second heat exchange tube and the slag bag to form a second heat exchange liquid.

5. The copper smelting slag waste heat recovery process as described in claim 4, characterized in that, After the step of injecting cooling water into the second heat exchange tube and forming a second heat exchange liquid through heat exchange with the slag bag via the second heat exchange tube, the method further includes: The first heat exchange liquid is mixed with the second heat exchange liquid so that the temperature of the mixed liquid is within a preset temperature range.

6. The copper smelting slag waste heat recovery process as described in claim 1, characterized in that, The steps of pouring molten smelting slag at high temperature into a slag bag, placing the slag bag in the slag bag tank, and reducing the temperature of the slag bag to a first temperature include: First steam is introduced into the cavity. The temperature of the first steam is greater than 100 degrees Celsius, so that the temperature drop rate v of the slag bag is 2.5℃ / min ≥ v ≥ 2℃ / min.

7. A copper smelting slag waste heat recovery device, characterized in that, include Slag pouch, used to hold molten smelting slag at high temperatures; A slag bag trough has a cavity, the cavity being used to place the slag bag; An air extraction device is connected to the cavity; A water spray device is positioned towards the slag bag.

8. The copper smelting slag waste heat recovery device as described in claim 7, characterized in that, The copper smelting slag waste heat recovery device also includes a steam homogenization device, which is connected to multiple first heat exchange tubes.

9. The copper smelting slag waste heat recovery device as described in claim 7, characterized in that, The copper smelting slag waste heat recovery device also includes a temperature sensor, which is installed in the cavity to detect the temperature of the slag bag.

10. The copper smelting slag waste heat recovery device as described in claim 9, characterized in that, The copper smelting slag waste heat recovery device also includes a control device, which is electrically connected to the air pump, the water spray device, and the temperature sensor.

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