Copper slag treatment device

Abstract

The utility model provides a copper slag treatment device which comprises a first reduction furnace, a second reduction furnace and a third reduction furnace, the first reduction furnace is provided with a mixture inlet, at least one first oxygen-enriched gas spray gun hole, at least one first fuel spray gun hole, a copper matte outlet, an iron slag outlet and a first smelting flue gas outlet, and the copper matte outlet is lower than the iron slag outlet; the second reduction furnace is provided with an iron slag inlet, a second carbonaceous reducing agent inlet, a pig iron outlet, a tailing outlet and a second smelting flue gas outlet, and the iron slag inlet is connected with the iron slag outlet through a hot slag chute; the tailing outlet is higher than the pig iron outlet. Based on the copper slag treatment device, the problems that in the prior art, the recovery rate of metal such as lead and zinc is low, and metal iron is difficult to recover are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgy, in particular to a copper slag processing device. Background Art

[0002] The smelting processes of modern pyrometallurgical copper smelting mainly include flash, bottom blowing, side blowing and top blowing, all of which will produce a large amount of copper slag. The copper slag contains a variety of valuable metals such as Cu, Fe, Pb, Zn, etc., which are of great recycling value. At present, the main processes for copper slag treatment include slag dressing and electric furnace depletion process. The main disadvantages of the slag dressing process are that it occupies a large area, has a long process, and cannot recover valuable metals such as lead and zinc; the electric furnace depletion process mainly has the disadvantages of high copper content in the tailings, low recovery rate of valuable metals such as lead and zinc, and difficulty in recovering metallic iron. Therefore, fully developing and utilizing this part of copper slag and extracting valuable metals such as iron, lead, and zinc from it is of great significance to realize the comprehensive utilization of copper slag and promote the healthy and sustainable development of the copper smelting industry. Utility Model Content

[0003] The main purpose of the utility model is to provide a copper slag processing device to solve the problems in the prior art that the recovery rate of metals such as lead and zinc is low and it is difficult to recover metallic iron.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a copper slag processing device, which comprises:

[0005] a first reduction furnace, wherein the first reduction furnace is provided with a mixed material inlet, at least one first oxygen-rich gas spray gun hole, at least one first fuel spray gun hole, a copper matte outlet, an iron slag outlet and a first smelting fume outlet, and the copper matte outlet is lower than the iron slag outlet;

[0006] The second reduction furnace is provided with a slag inlet, a second carbonaceous reducing agent inlet, a pig iron outlet, a tailings outlet and a second smelting fume outlet. The slag inlet is connected to the slag outlet through a hot slag chute; the tailings outlet is higher than the pig iron outlet.

[0007] Furthermore, the first reduction furnace is an oxygen-enriched side-blowing furnace; and / or the second reduction furnace is an electric furnace or an oxygen-enriched side-blowing furnace.

[0008] Furthermore, the second reduction furnace is an electric furnace, and the second reduction furnace is also provided with at least one second oxygen-rich gas spray gun hole and at least one second fuel spray gun hole.

[0009] Furthermore, the copper slag processing device also includes: a mixing unit, the mixing unit is provided with a copper slag cold material inlet, a first carbonaceous reducing agent inlet, a flux inlet and a mixed material outlet, and the mixed material outlet is connected to the mixed material inlet; and a copper slag molten material feed inlet is provided on the first reduction furnace.

[0010] Furthermore, the copper slag processing device also includes a first waste heat boiler, a first dust collecting device and a first desulfurization and denitrification tail gas treatment system. The first waste heat boiler is provided with a first smelting flue gas inlet, a first recovery flue gas outlet and a first boiler dust outlet. The first dust collecting device is provided with a first recovery flue gas inlet, a first dust removal flue gas outlet and a first dust outlet. The first smelting flue gas inlet is connected to the first smelting flue gas outlet, the first recovery flue gas outlet is connected to the first recovery flue gas inlet, and the first dust removal flue gas outlet is connected to the flue gas inlet of the first desulfurization and denitrification tail gas treatment system.

[0011] Furthermore, the copper slag processing device also includes a second waste heat boiler, a second dust collecting device and a second desulfurization and denitrification tail gas treatment system. The second waste heat boiler is provided with a second smelting flue gas inlet, a second recovery flue gas outlet and a second boiler dust outlet. The second dust collecting device is provided with a second recovery flue gas inlet, a second dust removal flue gas outlet and a second dust outlet. The second smelting flue gas inlet is connected to the second smelting flue gas outlet, the second recovery flue gas outlet is connected to the second recovery flue gas inlet, and the second dust removal flue gas outlet is connected to the flue gas inlet of the second desulfurization and denitrification tail gas treatment system.

[0012] Furthermore, the copper slag processing device also includes a gas storage device, and the gas outlet of the second desulfurization and denitrification tail gas treatment system is connected to the gas storage device.

[0013] Furthermore, the copper slag processing device also includes a leaching device for a wet leaching process, and the first boiler dust outlet and the first smoke dust outlet are respectively connected to the leaching device.

[0014] Furthermore, a return material port is provided on the first reduction furnace for receiving return materials from the second boiler dust outlet and the second smoke dust outlet.

[0015] Furthermore, the copper slag processing device also includes a copper matte blowing device for blowing the copper matte flowing out of the copper matte outlet to produce crude copper; and / or, the copper slag processing device also includes a pig iron refining device for refining the pig iron flowing out of the pig iron outlet.

[0016] By applying the technical scheme of the utility model, the required temperature is controlled by the first oxygen-rich gas and the first fuel, and the copper slag is subjected to the initial high-temperature reduction smelting with the flux, the first carbonaceous reducing agent, the first oxygen-rich gas and the first fuel under a reducing atmosphere to generate copper matte and iron slag that are easy to be separated by standing still, as well as the first smelting flue gas rich in valuable metals lead and zinc; then, the iron slag is subjected to secondary high-temperature reduction smelting under the reducing atmosphere of the second reduction furnace to generate pig iron and tailings that are easy to be separated by standing still, as well as the second smelting flue gas; wherein, lead and zinc are separated with the first smelting flue gas, copper is separated in the form of copper matte, and iron is separated in the form of pig iron, and finally a higher recovery rate of copper, iron, lead and zinc is obtained, thereby reducing the amount of metals such as copper and iron in the waste tailings, avoiding the generation of hazardous waste slag, and being environmentally friendly.

[0017] The copper slag smelting device can realize high-yield recovery of copper, iron, lead and zinc, and is easy to operate and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 A schematic structural diagram of a copper slag treatment device according to an embodiment of the utility model is shown;

[0020] Figure 2 A schematic structural diagram of a copper slag treatment device according to another embodiment of the utility model is shown;

[0021] Figure 3 A schematic structural diagram of a copper slag treatment device according to another embodiment of the utility model is shown;

[0022] Figure 4 A schematic diagram of the process of copper slag treatment by a copper slag treatment device according to an embodiment of the utility model is shown;

[0023] Figure 5 A schematic diagram of the process of copper slag treatment by a copper slag treatment device according to another embodiment of the utility model is shown.

[0024] The above drawings include the following reference numerals:

[0025] 1. First reduction furnace; 11. Mixed material inlet; 12. First oxygen-rich gas spray gun hole; 13. First fuel spray gun hole; 14. Copper matte outlet; 15. Iron slag outlet; 16. First smelting fume outlet; 17. Copper slag molten material feed inlet;

[0026] 2. Second reduction furnace; 21. Iron slag inlet; 22. Second carbonaceous reducing agent inlet; 23. Pig iron outlet; 24. Tailings outlet; 25. Second smelting fume outlet; 26. Third oxygen-rich gas spray gun hole; 27. Third fuel spray gun hole; 28. Electrode;

[0027] 3. Hot slag chute;

[0028] 4. The first waste heat boiler;

[0029] 5. The first dust collecting device;

[0030] 6. Second waste heat boiler; 61. Second smelting flue gas inlet; 62. Second recovered flue gas outlet;

[0031] 7. Second dust collecting device;

[0032] 8. The second desulfurization and denitrification tail gas treatment system;

[0033] 9. Gas storage device. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] As described in the background, the existing technology has the problem that the recovery rate of metals such as lead and zinc is low and it is difficult to recover metallic iron. In order to solve the above problems, Figure 1-3 As shown, the utility model provides a copper slag processing device, which includes: a first reduction furnace 1, the first reduction furnace 1 is provided with a mixture inlet 11, at least one first oxygen-rich gas spray gun hole 12, at least one first fuel spray gun hole 13, a copper matte outlet 14, a slag outlet 15 and a first smelting fume outlet 16, and the copper matte outlet 14 is lower than the slag outlet 15; a second reduction furnace 2, the second reduction furnace 2 is provided with a slag inlet 21, a second carbonaceous reducing agent inlet 22, a pig iron outlet 23, a tailings outlet 24 and a second smelting fume outlet 25, and the slag inlet 21 is connected to the slag outlet 15 through a hot slag chute 3; the tailings outlet 24 is higher than the pig iron outlet 23. The copper smelting slag is reduced and smelted at high temperature in the first reduction furnace 1 for volatilization and then allowed to stand for clarification. Copper matte and a small amount of precious metals such as gold and silver are mixed in the iron slag. Since the density of copper matte is greater than the density of the iron slag layer, under the action of high temperature and gravity clarification, the iron slag layer and the copper matte layer are separated (the precious metals enter the copper matte layer with the copper matte), and flow out from the copper matte outlet 14 and the iron slag outlet 15 respectively; the iron slag is subjected to secondary deep reduction smelting under the reducing atmosphere in the second reduction furnace 2 to generate pig iron and tailings that are easy to be separated by standing, and flow out from the tailings outlet 24 and the pig iron outlet 23 respectively.

[0036] In order to achieve high recovery rate of copper, iron, lead and zinc, the utility model provides a copper slag processing device, which controls the required temperature by the first oxygen-rich gas and the first fuel, and performs the initial high-temperature reduction smelting of the copper slag, the flux, the first carbonaceous reducing agent, the first oxygen-rich gas and the first fuel under the reducing atmosphere to generate copper matte and iron slag that are easy to stand and separate, and the first smelting flue gas rich in valuable metals lead and zinc; then, the iron slag is further subjected to secondary high-temperature reduction smelting in the reducing atmosphere of the second reduction furnace 2 to generate pig iron and tailings that are easy to stand and separate, and the second smelting flue gas; wherein, lead and zinc are separated with the first smelting flue gas, copper is separated in the form of copper matte, and iron is separated in the form of pig iron, and finally a higher recovery rate of copper, iron, lead and zinc is obtained, thereby reducing the amount of metals such as copper and iron in the waste tailings, avoiding the generation of hazardous waste slag, and being environmentally friendly. The above-mentioned device is used for copper slag smelting, which can achieve high recovery rate of copper, iron, lead and zinc, and is easy to operate, and has good application prospects.

[0037] In a preferred embodiment, the first reduction furnace 1 is an oxygen-enriched side-blowing furnace, which uses a side-blowing method to inject oxygen-enriched gas into the combustion chamber from the first oxygen-enriched gas injection hole 12 on the side of the furnace, so that the fuel combustion process is more complete and efficient with low cost; the second reduction furnace 2 is preferably an electric furnace (such as Figure 1 and Figure 3 ) or oxygen-enriched side-blown furnace (such as Figure 2 As shown), when the second reduction furnace 2 is an electric furnace, the electrodes 28 in the electric furnace are used for heat supply; when the second reduction furnace 2 is an oxygen-enriched side-blown furnace, at least one third oxygen-enriched gas spray gun hole 26 and at least one third fuel spray gun hole 27 on its side are used to spray oxygen and fuel for combustion and heat supply; in order to improve the effect of the second deep reduction and the static separation effect of pig iron and tailings, it is preferred that the second reduction furnace is an electric furnace, and the use of an electric furnace makes the production environment quieter.

[0038] In a preferred embodiment, the second reduction furnace 2 is an electric furnace, and at least one second oxygen-rich gas spray gun hole and at least one second fuel spray gun hole (not shown) are also provided on the second reduction furnace. The electrodes 28 in the electric furnace are used for main heating, and the electric furnace can be further heated by spraying oxygen and fuel when necessary.

[0039] In a preferred embodiment, the copper slag processing device also includes: a mixing unit, the mixing unit is provided with a copper slag cold material inlet, a first carbonaceous reducing agent inlet, a flux inlet and a mixture outlet, and the mixture outlet is connected to the mixture inlet 11; a copper slag molten material feed inlet 17 is provided on the first reduction furnace 1, thereby, when the copper slag cold material is processed, the copper slag, the first carbonaceous reducing agent and the flux are mixed by the mixing unit and added through the mixture inlet 11 of the first reduction furnace 1, when the copper slag in liquid molten state is processed, the liquid molten copper slag is added to the first reduction furnace 1 through the copper slag molten material feed inlet 17, and the first carbonaceous reducing agent and the flux are mixed by the mixing unit and added through the mixture inlet 11 of the first reduction furnace 1, so that the liquid molten copper slag directly enters the first reduction furnace 1 through the copper slag molten material feed inlet 17, so that the latent heat of the liquid slag is fully utilized.

[0040] In a preferred embodiment, Figure 1-3 As shown, the copper slag treatment device also includes a first waste heat boiler 4, a first dust collecting device 5 and a first desulfurization and denitrification tail gas treatment system. The first waste heat boiler 4 is provided with a first smelting flue gas inlet, a first recovery flue gas outlet and a first boiler dust outlet. The first dust collecting device 5 is provided with a first recovery flue gas inlet, a first dust removal flue gas outlet and a first dust outlet. The first smelting flue gas inlet is connected to the first smelting flue gas outlet 16, the first recovery flue gas outlet is connected to the first recovery flue gas inlet, and the first dust removal flue gas outlet is connected to the flue gas inlet of the first desulfurization and denitrification tail gas treatment system.

[0041] In a preferred embodiment, the copper slag treatment device also includes a second waste heat boiler 6, a second dust collecting device 7 and a second desulfurization and denitrification tail gas treatment system 8. The second waste heat boiler 6 is provided with a second smelting flue gas inlet 61, a second recovery flue gas outlet 62 and a second boiler dust outlet. The second dust collecting device 7 is provided with a second recovery flue gas inlet, a second dust removal flue gas outlet and a second dust outlet. The second smelting flue gas inlet 61 is connected to the second smelting flue gas outlet 25, the second recovery flue gas outlet 62 is connected to the second recovery flue gas inlet, and the second dust removal flue gas outlet is connected to the flue gas inlet of the second desulfurization and denitrification tail gas treatment system 8.

[0042] like Figure 2 and Figure 3 As shown, the copper slag processing device also includes a gas storage device 9, and the gas outlet of the second desulfurization and denitrification tail gas processing system 8 is connected to the gas storage device 9.

[0043] In a preferred embodiment, the copper slag processing device further comprises a leaching device of a wet leaching process, and the first boiler dust outlet and the first smoke dust outlet are respectively connected to the leaching device.

[0044] In a preferred embodiment, a return material port is provided on the first reduction furnace for receiving return materials from the second boiler dust outlet and the second smoke dust outlet (not shown).

[0045] In a preferred embodiment, the copper slag processing device also includes a copper matte blowing device (not shown), which is used to blow the copper matte flowing out of the copper matte outlet 14 to produce crude copper; the copper slag processing device also includes a pig iron refining device (not shown), which is used to refine the pig iron flowing out of the pig iron outlet 23.

[0046] A method for treating copper slag using the copper slag treatment device as above, as Figure 4 As shown, it includes the following steps: step S1, copper slag, flux, a first carbonaceous reducing agent, a first oxygen-rich gas and a first fuel are subjected to a first reduction smelting in a first reduction furnace 1 to obtain copper matte, iron slag and a first smelting flue gas rich in lead and zinc, and the smelting temperature in the first reduction furnace 1 is 1200-1600°C; step S2, iron slag and a second carbonaceous reducing agent are subjected to a second reduction smelting in a second reduction furnace 2 to obtain pig iron, tailings and a second smelting flue gas, and the smelting temperature of the second reduction furnace 2 is 1200-1700°C.

[0047] In a preferred embodiment, the flux is selected from at least one of quartz, pyrite, limestone, and dolomite. The above flux materials are widely available and low in cost. The first carbonaceous reducing agent is preferably selected from at least one of coal and coke. The above carbonaceous reducing agent materials are widely available, low in cost, and have a high carbon content, which is convenient for controlling the reducing atmosphere to generate copper matte and iron slag. The first oxygen-rich gas is preferably oxygen-rich air, and the oxygen concentration in the oxygen-rich air is 20-90% by volume, and more preferably the oxygen concentration is 50%-80%. The first fuel is preferably selected from at least one of natural gas, coal gas or pulverized coal, and the heat generated by the combustion of the above high-quality carbonaceous fuel is used as the energy source, which has a high calorific value and is convenient for temperature control.

[0048] In a preferred embodiment, the second carbonaceous reducing agent is selected from at least one of coal and coke; preferably, during the second reduction smelting, the smelting temperature of the second reduction furnace 2 is controlled by electric heat and / or combustion heat; preferably, during the second reduction smelting, the smelting temperature of the second reduction furnace 2 is controlled by electric heat, and the reduction heat can be provided by an electric furnace or by fuel combustion. In order to avoid the adverse effects of the disturbance of oxygen and fuel on the deep reduction effect and the static separation of pig iron and tailings, an electric furnace is preferably used; more preferably, during the second reduction smelting, electric heat is used and the smelting temperature is jointly controlled by combustion heat supplementation, and the combustion heat is generated by adding the second fuel and the second oxygen-rich gas into the second reduction furnace 2. Therefore, on the basis of electric heat reduction, the second reduction furnace 2 is supplemented by fuel combustion when necessary, which can further maintain the stability of the furnace temperature, thereby improving the recovery rate and resource utilization rate of zinc; further preferably, the second oxygen-rich gas is oxygen-enriched air, and the oxygen concentration in the oxygen-enriched air is 20-90% by volume; further preferably, the second fuel is selected from at least one of natural gas, coal gas or pulverized coal.

[0049] In a preferred embodiment, Figure 5 As shown, in step S1, when the copper slag is a cold material, the copper slag, the flux and the first carbonaceous reducing agent are mixed by a mixing unit and supplied to the first reduction furnace 1; when the copper slag is a liquid molten material, the flux and the first carbonaceous reducing agent are mixed by a mixing unit and supplied to the first reduction furnace 1, and the copper slag is supplied to the first reduction furnace 1 through the copper slag molten material feed port 17 on the first reduction furnace 1, so that the latent heat of the liquid slag is fully utilized.

[0050] In a preferred embodiment, Figure 5As shown, step S1 also includes: supplying the first smelting flue gas to the first waste heat boiler 4 for waste heat recovery to obtain the first recovered flue gas and the first boiler dust, supplying the first recovered flue gas to the first dust collecting device 5 for dust removal to obtain the first dust-removed flue gas and the first flue dust, supplying the first dust-removed flue gas to the first desulfurization and denitrification tail gas treatment system for treatment and then discharging, thereby, the generated first smelting flue gas passes through the first waste heat boiler 4 to generate the first boiler dust and the medium and low temperature first recovered flue gas, and at the same time, the waste heat boiler recovers the waste heat of the first smelting flue gas to produce steam or hot water for waste heat power generation or production and life, The low-temperature first recovered flue gas is dedusted by the first dust collecting device 5 to obtain dedusted flue dust and dedusted flue gas (i.e., the first dedusted flue gas), and the first dedusted flue gas is sent to the first desulfurization and denitrification tail gas treatment system for treatment and purification and then discharged into the air, which is energy-saving and environmentally friendly; the preferred step S2 also includes: supplying the second smelting flue gas to the second waste heat boiler 6 for waste heat recovery to obtain second recovered flue gas and second boiler dust, supplying the second recovered flue gas to the second dust collecting device 7 for dust removal to obtain second dedusted flue gas and second flue dust, and supplying the second dedusted flue gas to the second desulfurization and denitrification tail gas treatment system 8. The second dust removal flue gas is preferably supplied to the second desulfurization and denitration tail gas treatment system 8, and the coal gas obtained after treatment is supplied to the coal gas storage device 9. The second reduction furnace 2 is further reduced to prepare metallic iron. Excessive reducing agent will produce more coal gas, which is stored in the coal gas storage device 9 for use as fuel, thereby improving resource utilization. The first boiler dust and the first flue dust are preferably supplied to the leaching device of the wet leaching process. The second boiler dust and the second flue dust are more preferably used as return materials to be supplied to the first reduction furnace 1. The valuable metals such as lead and zinc in the first smelting flue gas rich in lead and zinc are The first boiler dust is oxidized, cooled, and collided to separate lead and zinc. The first boiler dust containing lead and zinc is recovered by the leaching device together with the first smoke dust. The second boiler dust and the second smoke dust can be returned to the first reduction furnace 1 for processing again to achieve full recovery and utilization of resources. For further separation and purification, the preferred step S1 also includes: supplying copper matte to the copper matte blowing device to produce crude copper, and the preferred step S2 also includes: supplying pig iron to the pig iron refining device, thereby, the produced pig iron can be further refined to improve the purity of the product in addition to being directly sold. It should be noted that the leaching operation, acid production operation, copper matte blowing operation, pig iron refining operation, and tail gas desulfurization and denitrification operation are all conventional operations in the prior art and will not be repeated here.

[0051] In a preferred embodiment, the mass ratio of copper slag, flux and the first carbonaceous reducing agent is (70-80): (20-30): (20-30) to fully generate iron slag and copper matte and improve the separation effect of iron and copper; preferably, the mass ratio of iron slag and the second carbonaceous reducing agent is (70-80): (30-40) to fully reduce the iron component in the iron slag to metallic iron; preferably, the smelting temperature in the first reduction furnace 1 is 1300-1500°C; preferably, the smelting temperature in the second reduction furnace 2 is 1400-1600°C.

[0052] The present application is further described in detail below in conjunction with specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed in the present application.

[0053] Example 1

[0054] A method for treating copper slag comprises the following steps:

[0055] (1) Copper slag, quartz, limestone, dolomite and coke are batched and mixed in a mass ratio of 75:10:5:10:24 to obtain a mixture, and the obtained mixture, oxygen-enriched air and natural gas are added to a first reduction furnace 1 for a first reduction smelting to obtain copper matte, iron slag and a first smelting flue gas rich in lead and zinc. The smelting temperature in the first reduction furnace 1 is 1300° C., wherein the oxygen concentration in the oxygen-enriched air is 60%; the first smelting flue gas is supplied to a first waste heat boiler 4 for waste heat recovery to obtain a first recovered flue gas and a first boiler dust, the first recovered flue gas is supplied to a first dust collecting device 5 for dust removal to obtain a first dust-removed flue gas and a first flue dust, the first dust-removed flue gas is supplied to a first desulfurization and denitrification tail gas treatment system for treatment and then discharged, and the first flue dust and the first boiler dust are supplied to a leaching device of a wet leaching process to recover lead and zinc.

[0056] (2) The obtained iron slag and coke are mixed in a mass ratio of 75:36, and a second reduction smelting is carried out in the second reduction furnace 2 to obtain pig iron, tailings and second smelting flue gas. The smelting temperature of the second reduction furnace 2 is 1400°C; the second smelting flue gas is supplied to the second waste heat boiler 6 for waste heat recovery to obtain second recovered flue gas and second boiler dust, the second recovered flue gas is supplied to the second dust collecting device 7 for dust removal to obtain second dust-removed flue gas and second flue dust, the second dust-removed flue gas is supplied to the second desulfurization and denitrification tail gas treatment system 8 for treatment and then stored in the gas storage device 9, and the second flue dust and the second boiler dust are used as return materials and supplied to the first reduction furnace 1.

[0057] Example 2

[0058] A method for treating copper slag comprises the following steps:

[0059] (1) Copper slag, quartz, limestone, dolomite and coal are batched and mixed in a mass ratio of 70:5:5:10:20 to obtain a mixture; the obtained mixture, oxygen-enriched air and natural gas are added together into a first reduction furnace 1 for first reduction smelting to obtain copper matte, iron slag and a first smelting flue gas rich in lead and zinc, the smelting temperature in the first reduction furnace 1 is 1500° C., wherein the oxygen concentration in the oxygen-enriched air is 50%; the first smelting flue gas is supplied to a first waste heat boiler 4 for waste heat recovery to obtain a first recovered flue gas and a first boiler dust, the first recovered flue gas is supplied to a first dust collecting device 5 for dust removal to obtain a first dust-removed flue gas and a first flue dust, the first dust-removed flue gas is supplied to a first desulfurization and denitrification tail gas treatment system for treatment and then discharged, and the first flue dust and the first boiler dust are supplied together to a leaching device of a wet leaching process to recover lead and zinc.

[0060] (2) The obtained iron slag and coal are mixed in a mass ratio of 70:30, and a second reduction smelting is carried out in the second reduction furnace 2 to obtain pig iron, tailings and second smelting flue gas. The smelting temperature of the second reduction furnace 2 is 1600°C; the second smelting flue gas is supplied to the second waste heat boiler 6 for waste heat recovery to obtain second recovered flue gas and second boiler dust, the second recovered flue gas is supplied to the second dust collecting device 7 for dust removal to obtain second dust-removed flue gas and second flue dust, the second dust-removed flue gas is supplied to the second desulfurization and denitrification tail gas treatment system 8 for treatment and then stored in the coal gas storage device 9, and the second flue dust and the second boiler dust are used as return materials and supplied to the first reduction furnace 1.

[0061] Example 3

[0062] A method for treating copper slag comprises the following steps:

[0063] (1) Copper slag, quartz, limestone, dolomite and coke are batched and mixed in a mass ratio of 80:10:10:10:30 to obtain a mixture; the obtained mixture, oxygen-enriched air and natural gas are added together into a first reduction furnace 1 for first reduction smelting to obtain copper matte, iron slag and a first smelting flue gas rich in lead and zinc, the smelting temperature in the first reduction furnace 1 is 1200° C., wherein the oxygen concentration in the oxygen-enriched air is 80%; the first smelting flue gas is supplied to a first waste heat boiler 4 for waste heat recovery to obtain a first recovered flue gas and a first boiler dust, the first recovered flue gas is supplied to a first dust collecting device 5 for dust removal to obtain a first dust-removed flue gas and a first flue dust, the first dust-removed flue gas is supplied to a first desulfurization and denitrification tail gas treatment system for treatment and then discharged, and the first flue dust and the first boiler dust are supplied together to a leaching device of a wet leaching process to recover lead and zinc.

[0064] (2) The obtained iron slag and coke are mixed in a mass ratio of 80:40, and a second reduction smelting is carried out in the second reduction furnace 2 to obtain pig iron, tailings and second smelting flue gas. The smelting temperature of the second reduction furnace 2 is 1200°C; the second smelting flue gas is supplied to the second waste heat boiler 6 for waste heat recovery to obtain second recovered flue gas and second boiler dust, the second recovered flue gas is supplied to the second dust collecting device 7 for dust removal to obtain second dust-removed flue gas and second flue dust, the second dust-removed flue gas is supplied to the second desulfurization and denitrification tail gas treatment system 8 for treatment and then stored in the coal gas storage device 9, and the second flue dust and the second boiler dust are used as return materials and supplied to the first reduction furnace 1.

[0065] Comparative Example 1

[0066] The difference from Example 1 is that the smelting temperature in the first reduction furnace 1 in step (1) is 1150°C, and the smelting temperature in the second reduction furnace 2 in step (2) is 1150°C.

[0067] The recovery rates of various elements in the copper slag in Examples 1-3 and Comparative Example 1 are shown in Table 1.

[0068] Table 1

[0069] Copper recovery rate (%) Iron recovery rate (%) Lead recovery rate (%) Zinc recovery rate (%) Example 1 99.5 98.3 99.2 98.5 Example 2 99.6 98.5 99.4 98.8 Example 3 98.8 92.6 94.6 93.5 Comparative Example 1 90.5 / 85.5 80.6

[0070] From the above description, it can be seen that Examples 1-3 achieve high recovery rates of copper, iron, lead and zinc. In Comparative Example 1, because the reduction temperature is too low, the formation of copper matte in the first reduction furnace 1, the formation of target iron slag, the volatilization of the first smelting flue gas and the reduction of iron in the second reduction furnace 2 are affected. Therefore, the recovery rate of each element in Comparative Example 1 is significantly lower than that of Examples 1-3, and the iron in the copper slag cannot be recovered, resulting in almost all of the iron remaining in the tailings. The copper slag treatment device provided by the utility model is successively reduced and smelted in the reducing atmosphere in the first reduction furnace 1 and the reducing atmosphere in the second reduction furnace 2. Finally, copper is separated and recovered in the form of copper matte, iron is separated and recovered as pig iron, lead and zinc are separated from the first smelting flue gas and can be separated and recovered through a leaching process, and finally a higher recovery rate of copper, iron, lead and zinc is obtained, thereby reducing the content of copper, iron, lead, zinc and precious metals in the waste tailings, avoiding the generation of hazardous waste slag, being environmentally friendly and having good application prospects.

[0071] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A copper slag treatment device, characterized in that: The copper slag treatment device includes: A first reduction furnace (1), wherein the first reduction furnace (1) is provided with a mixed material inlet (11), at least one first oxygen-rich gas spray gun hole (12), at least one first fuel spray gun hole (13), a copper matte outlet (14), an iron slag outlet (15) and a first smelting fume outlet (16), wherein the copper matte outlet (14) is lower than the iron slag outlet (15); A second reduction furnace (2), wherein the second reduction furnace (2) is provided with a slag inlet (21), a second carbonaceous reducing agent inlet (22), a pig iron outlet (23), a tailings outlet (24) and a second smelting fume outlet (25), wherein the slag inlet (21) is connected to the slag outlet (15) via a hot slag chute (3); and the tailings outlet (24) is higher than the pig iron outlet (23).

2. The copper slag treatment device according to claim 1, characterized in that: The first reduction furnace (1) is an oxygen-enriched side-blown furnace; And / or, the second reduction furnace (2) is an electric furnace or an oxygen-enriched side-blown furnace.

3. The copper slag treatment device according to claim 2, characterized in that: The second reduction furnace (2) is an electric furnace, and the second reduction furnace (2) is also provided with at least one second oxygen-rich gas spray gun hole and at least one second fuel spray gun hole.

4. The copper slag treatment device according to claim 1, characterized in that: The copper slag processing device also includes: a mixing unit, the mixing unit is provided with a copper slag cold material inlet, a first carbonaceous reducing agent inlet, a flux inlet and a mixed material outlet, the mixed material outlet is connected to the mixed material inlet (11); the first reduction furnace (1) is provided with a copper slag molten material feed inlet (17).

5. The copper slag treatment device according to any one of claims 1 to 4, characterized in that: The copper slag treatment device also includes a first waste heat boiler (4), a first dust collecting device (5) and a first desulfurization and denitrification tail gas treatment system, wherein the first waste heat boiler (4) is provided with a first smelting flue gas inlet, a first recovery flue gas outlet and a first boiler dust outlet, and the first dust collecting device (5) is provided with a first recovery flue gas inlet, a first dust removal flue gas outlet and a first flue dust outlet, the first smelting flue gas inlet is connected to the first smelting flue gas outlet (16), the first recovery flue gas outlet is connected to the first recovery flue gas inlet, and the first dust removal flue gas outlet is connected to the flue gas inlet of the first desulfurization and denitrification tail gas treatment system.

6. The copper slag treatment device according to claim 5, characterized in that: The copper slag treatment device also includes a second waste heat boiler (6), a second dust collecting device (7) and a second desulfurization and denitrification tail gas treatment system (8). The second waste heat boiler (6) is provided with a second smelting flue gas inlet (61), a second recovery flue gas outlet (62) and a second boiler dust outlet. The second dust collecting device (7) is provided with a second recovery flue gas inlet, a second dust removal flue gas outlet and a second flue dust outlet. The second smelting flue gas inlet (61) is connected to the second smelting flue gas outlet (25), the second recovery flue gas outlet (62) is connected to the second recovery flue gas inlet, and the second dust removal flue gas outlet is connected to the flue gas inlet of the second desulfurization and denitrification tail gas treatment system (8).

7. The copper slag treatment device according to claim 6, characterized in that: The copper slag treatment device further comprises a coal gas storage device (9), and the gas outlet of the second desulfurization and denitrification tail gas treatment system (8) is connected to the coal gas storage device (9).

8. The copper slag treatment device according to claim 6, characterized in that: The copper slag treatment device also includes a leaching device for a wet leaching process, and the first boiler dust outlet and the first smoke dust outlet are respectively connected to the leaching device.

9. The copper slag treatment device according to claim 6, characterized in that: The first reduction furnace is provided with a return material port for receiving the return material from the second boiler dust outlet and the second smoke dust outlet.

10. The copper slag treatment device according to claim 5, characterized in that: The copper slag processing device further comprises a copper matte blowing device for blowing the copper matte flowing out of the copper matte outlet (14) to produce crude copper; and / or the copper slag processing device further comprises a pig iron refining device for refining the pig iron flowing out of the pig iron outlet (23).

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