Reduction furnace for treating cobalt-containing copper smelting slag and method for treating cobalt-containing copper smelting slag using the reduction furnace

Abstract

The invention discloses a reduction furnace for treating cobalt-containing copper smelting slag and a method for treating cobalt-containing copper smelting slag using the reduction furnace, wherein the reduction furnace comprises: a reduction furnace body, which comprises: a furnace body, a charging area and a molten pool are formed from top to bottom in the furnace body, and a slag layer and a copper-cobalt matte layer are formed from top to bottom in the molten pool; an electrode, which extends from the top of the furnace body and extends to the slag layer; a spraying device, which comprises: a drying device, and the drying device has a reducing agent inlet, a sulfiding agent inlet and a mixed agent outlet; a spray gun, the other end of which is arranged obliquely downward and extends from the top of the furnace body to the slag layer; a flue gas treatment unit, which is connected to the flue gas outlet; a copper-cobalt matte storage device, which has a copper-cobalt matte inlet and a copper-cobalt matte particle outlet; a magnetic separation device, which has a copper-cobalt matte particle inlet, a copper concentrate outlet and a cobalt concentrate outlet. The reduction furnace can fully extract copper and cobalt valuable metals in the cobalt-containing copper smelting slag, and the recovery rate is high and the environment is friendly.

Description

Technical Field

[0001] The invention belongs to the field of metallurgy, and in particular relates to a reduction furnace for treating cobalt-containing copper smelting slag and a method for treating the cobalt-containing copper smelting slag by using the reduction furnace. Background Art

[0002] At present, cobalt is widely used in new energy lithium battery materials. Like copper, cobalt plays an important role in national defense and national economy as a strategic metal. More than 80% of the world's copper is extracted from copper sulfide concentrate by pyrometallurgy. The copper smelting slag obtained by pyrometallurgy smelting copper sulfide concentrate contains 0.5-7% copper. The physical and chemical properties of cobalt are similar to those of copper, and the trend is also similar. Therefore, for high-cobalt copper sulfide concentrate, the existing pyrometallurgy smelting technology and methods will make the copper smelting slag rich in cobalt.

[0003] At present, the most advanced copper smelting slag treatment methods are mainly ore dressing depletion and electric furnace depletion. However, facing new problems such as the effective separation and extraction of cobalt and copper in high-cobalt copper smelting slag, the existing ore dressing depletion and electric furnace depletion treatment are difficult to achieve. Therefore, continuous technological innovation and progress are needed. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one object of the present invention is to provide a reduction furnace for treating cobalt-containing copper smelting slag and a method for treating cobalt-containing copper smelting slag using the reduction furnace, wherein the reduction furnace can fully extract copper and cobalt valuable metals in the cobalt-containing copper smelting slag with high recovery rate and environmental friendliness.

[0005] In one aspect of the present invention, the present invention provides a reduction furnace for treating cobalt-containing copper smelting slag. According to an embodiment of the present invention, the reduction furnace comprises:

[0006] The reduction furnace body comprises:

[0007] A furnace body, wherein a feeding area and a molten pool are formed from top to bottom in the furnace body, the feeding area is provided with a cobalt-copper smelting slag inlet and a flue gas outlet, the molten pool forms a slag layer and a copper-cobalt matte layer from top to bottom, the slag layer is provided with a slag outlet, and the copper-cobalt matte layer is provided with a copper-cobalt matte outlet;

[0008] An electrode, the electrode extending from the top of the furnace body into the slag layer;

[0009] The blowing device comprises:

[0010] A drying device, wherein the drying device has a reducing agent inlet, a sulfiding agent inlet and a mixing agent outlet;

[0011] A spray gun, wherein the spray gun is arranged obliquely downward, and one end of the spray gun is connected to the mixture outlet, and the other end of the spray gun extends from the top of the furnace body into the slag layer;

[0012] A smoke treatment unit, wherein the smoke treatment unit is connected to the smoke outlet;

[0013] a copper-cobalt matte storage device, the copper-cobalt matte storage device having a copper-cobalt matte inlet and a copper-cobalt matte particle outlet, the copper-cobalt matte inlet being connected to the copper-cobalt matte outlet;

[0014] A magnetic separation device is provided, wherein the magnetic separation device has a copper-cobalt matte particle inlet, a copper concentrate outlet and a cobalt concentrate outlet, and the copper-cobalt matte particle inlet is connected to the copper-cobalt matte particle outlet.

[0015] According to the reduction furnace for treating cobalt-containing copper smelting slag according to the embodiment of the present invention, a spray gun is used to supply a reducing agent and a sulfiding agent into the reduction furnace to carry out reduction and sulfidation reaction with the cobalt-containing copper smelting slag, so that the copper and cobalt in the cobalt-containing copper smelting slag are converted into copper sulfide and cobalt sulfide, that is, they are settled at the bottom of the molten pool in the form of copper-cobalt matte melt, and then the copper-cobalt matte melt is slowly cooled, crushed and magnetically separated to separate copper concentrate and cobalt concentrate. In addition, by arranging the spray gun obliquely downward in the reduction furnace, on the one hand, the reducing agent and the sulfiding agent can be prevented from being sprayed into the copper-cobalt matte at the bottom of the molten pool, and on the other hand, the slag layer material can be stirred so that the reducing agent and the sulfiding agent are fully in contact with the cobalt-containing copper smelting slag, thereby improving the conversion rate of copper sulfide and cobalt sulfide, and then improving their recovery rate. At the same time, electrodes are used to supply heat to the electric furnace. Compared with using chemical energy of other fossil fuels for heating, oxygen does not need to be supplied to the reduction furnace of the present application, thereby maintaining the reducing atmosphere in the reduction furnace and improving the reduction efficiency of the materials in the furnace.

[0016] In addition, the reduction furnace for treating cobalt-containing copper smelting slag according to the above embodiment of the present invention may also have the following additional technical features:

[0017] In some embodiments of the present invention, the electrode extends vertically from the center of the top of the furnace body into the slag layer, thereby maintaining the temperature of the material in the reduction furnace.

[0018] In some embodiments of the present invention, the angle between the spray gun and the furnace body in the height direction is 0 to 45 degrees, thereby improving the recovery rate of copper and cobalt.

[0019] In some embodiments of the present invention, a plurality of the spray guns are provided, and the plurality of spray guns are arranged in parallel and spaced apart from each other, thereby improving the recovery rate of copper and cobalt.

[0020] In some embodiments of the present invention, the discharge port of the spray gun is close to the drop point of the cobalt-containing copper smelting slag inlet, thereby improving the recovery rate of copper and cobalt.

[0021] In some embodiments of the present invention, the spray gun is arranged obliquely to the electrode, thereby improving the recovery rate of copper and cobalt.

[0022] In some embodiments of the present invention, the flue gas treatment unit comprises a secondary combustion chamber, a waste heat boiler and a dust collecting chamber connected in sequence, and the secondary combustion chamber is connected to the flue gas outlet, thereby fully utilizing resources while avoiding environmental pollution.

[0023] In another aspect of the present invention, the present invention provides a method for treating cobalt-containing copper smelting slag. According to an embodiment of the present invention, the method comprises:

[0024] (1) supplying a reducing agent and a sulfiding agent to the drying device for drying, and supplying the obtained mixture to the slag layer in the reduction furnace through the spray gun, and simultaneously supplying cobalt-containing copper smelting slag into the furnace body, so as to obtain smelting slag, flue gas and copper-cobalt matte;

[0025] (2) supplying the flue gas to the flue gas treatment unit for treatment and then discharging;

[0026] (3) supplying the copper-cobalt matte to the copper-cobalt matte storage device for slow cooling and crushing to obtain copper-cobalt matte particles;

[0027] (4) supplying the copper-cobalt matte particles to the magnetic separation device for magnetic separation treatment to obtain copper concentrate and cobalt concentrate.

[0028] According to the method for treating cobalt-containing copper smelting slag according to an embodiment of the present invention, a reducing agent and a sulfiding agent are supplied into a reduction furnace by a spray gun to carry out reduction and sulfidation reaction with the cobalt-containing copper smelting slag, so that the copper and cobalt in the cobalt-containing copper smelting slag are converted into copper sulfide and cobalt sulfide, that is, they are settled at the bottom of the molten pool in the form of copper-cobalt matte melt, and then the copper-cobalt matte melt is subjected to slow cooling, crushing and magnetic separation treatment to separate copper concentrate and cobalt concentrate. In addition, by arranging the spray gun obliquely downward in the reduction furnace, on the one hand, the reducing agent and the sulfiding agent can be prevented from being sprayed into the copper-cobalt matte at the bottom of the molten pool, and on the other hand, the slag layer material can be stirred so that the reducing agent and the sulfiding agent are fully in contact with the cobalt-containing copper smelting slag, thereby improving the conversion rate of copper sulfide and cobalt sulfide, and then improving their recovery rate. At the same time, electrodes are used to supply heat to the electric furnace. Compared with using chemical energy of other fossil fuels for heating, oxygen does not need to be supplied to the reduction furnace of the present application, thereby maintaining the reducing atmosphere in the reduction furnace and improving the reduction efficiency of the materials in the furnace.

[0029] In some embodiments of the present invention, in step (1), the sulfiding agent is at least one selected from copper sulfide ore and cobalt sulfide ore.

[0030] In some embodiments of the present invention, in step (2), the flue gas treatment includes secondary combustion, waste heat recovery and dust removal, thereby making full use of resources while avoiding environmental pollution.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0033] Figure 1 is a schematic structural diagram of a reduction furnace for treating cobalt-containing copper smelting slag according to one embodiment of the present invention;

[0034] Figure 2 is a schematic structural diagram of a reduction furnace for treating cobalt-containing copper smelting slag according to yet another embodiment of the present invention;

[0035] Figure 3 is a schematic diagram of a top view of a reduction furnace body on a reduction furnace for treating cobalt-containing copper smelting slag according to another embodiment of the present invention;

[0036] Figure 4 It is a schematic flow chart of a method for treating cobalt-containing copper smelting slag according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0041] In one aspect of the present invention, a reduction furnace for treating cobalt-containing copper smelting slag is provided. Figure 1-3 The reduction furnace includes a reduction furnace body 100, a blowing device 200, a flue gas treatment unit 300, a copper-cobalt matte storage device 400 and a magnetic separation device 500.

[0042] According to an embodiment of the present invention, referring to Figure 1 The reduction furnace body 100 includes a furnace body 10 and an electrode 11, wherein a charging area 12 and a molten pool 13 are formed from top to bottom in the furnace body 10, and the charging area 12 is provided with a cobalt-containing copper smelting slag inlet 101 and a flue gas outlet 102, the molten pool 13 forms a slag layer 14 and a copper-cobalt matte layer 15 from top to bottom, the slag layer 14 is provided with a slag outlet 103, and the copper-cobalt matte layer 15 is provided with a copper-cobalt matte outlet 104, and the electrode 11 extends from the top of the furnace body 10 into the slag layer 14. Specifically, the cobalt-containing copper smelting slag of the present application is derived from the molten cobalt-containing copper smelting slag obtained in the copper ore smelting furnace, which slides into the reduction furnace along the chute through the cobalt-containing copper smelting slag inlet on the furnace body, so that the waste heat of the molten cobalt-containing copper smelting slag can be fully utilized, thereby reducing the energy consumption in the reduction furnace. At the same time, electrodes are used in the reduction furnace body to supply heat to the reduction furnace body to maintain the copper-cobalt matte layer at the bottom of the molten pool in a molten state. Compared with the use of chemical energy of other fossil fuels for heating, the reduction furnace of the present application does not need to supply oxygen, thereby maintaining the reducing atmosphere in the reduction furnace and improving the reduction efficiency of the materials in the furnace. According to a specific embodiment of the present invention, refer to Figure 3The electrode 11 extends vertically from the center of the top of the furnace body 10 into the slag layer 15, thereby effectively maintaining the temperature inside the furnace body.

[0043] According to an embodiment of the present invention, referring to Figure 1 The spraying device 200 includes a drying device 21 and a spray gun 22, wherein the drying device 21 has a reducing agent inlet 201, a sulfiding agent inlet 202 and a mixed agent outlet 203, so that the mixed agent containing the reducing agent and the sulfiding agent is dried to the water content required for spraying, and the subsequent reaction efficiency is improved. Specifically, the reducing agent can be at least one of a solid reducing agent, a gas reducing agent and a liquid reducing agent, such as a mixed gas containing hydrogen and carbon monoxide, pulverized coal, etc. The sulfiding agent is at least one selected from copper sulfide ore and cobalt sulfide ore, and the mixing ratio of the reducing agent and the sulfiding agent in the mixed agent is not particularly limited, as long as the cobalt and copper in the cobalt-containing copper smelting slag can be fully recovered. For example, taking pulverized coal as an example, the mass ratio of the reducing agent to the sulfiding agent is 0.1-0.5, and taking the mixed gas containing hydrogen and carbon monoxide as an example, the volume ratio of the reducing agent to the mass ratio of the sulfiding agent is 0.05-0.4. Further, the spray gun 22 is arranged obliquely downward, preferably the spray gun 22 is arranged obliquely toward the electrode 11, and one end of the spray gun 22 is connected to the mixture outlet 203, and the other end of the spray gun 22 extends from the top of the furnace body 10 into and to the slag layer 14, so that the dry mixture obtained in the drying device is supplied to the slag layer through the spray gun, and because the spray gun is arranged obliquely downward, the mixture sprayed by the spray gun can stir the slag layer material, so that the cobalt-containing copper smelting slag is fully in contact with the reducing agent and the sulfiding agent. According to a specific embodiment of the present invention, reference Figure 1, the angle γ between the spray gun 22 and the height direction of the furnace body 10 is 0 to 45 degrees, such as 1 degree, 5 degrees, 7 degrees, 10 degrees, 12 degrees, 15 degrees, 17 degrees, 20 degrees, 22 degrees, 25 degrees, 27 degrees, 30 degrees, 32 degrees, 35 degrees, 37 degrees, 40 degrees, 42 degrees, 45 degrees. The inventors found that by setting the spray gun at this angle, on the one hand, the reducing agent and the sulfiding agent can be prevented from being sprayed into the copper-cobalt matte at the bottom of the molten pool, and on the other hand, the slag layer material can be stirred so that the reducing agent and the sulfiding agent are fully in contact with the cobalt-containing copper smelting slag, thereby improving the conversion rate of copper sulfide and cobalt sulfide, and then improving their recovery rate. Preferably, a plurality of spray guns 22 can be provided, and the plurality of spray guns 22 are arranged in parallel and at intervals, thereby significantly improving the recovery rate of copper and cobalt. According to a specific example of the present invention, the discharge port of the spray gun 22 is close to the drop point of the cobalt-containing copper smelting slag inlet 101, that is, the cobalt-containing copper smelting slag supplied through the cobalt-containing copper smelting slag inlet is immediately taken away by the mixture sprayed by the spray gun when it falls into the slag layer, so as to avoid the cobalt-containing copper smelting slag staying in the slag layer for a long time, thereby further improving the recovery rate of copper and cobalt. Therefore, by using a spray gun to supply the reducing agent and the sulfiding agent into the reduction furnace to carry out reduction and sulfidation reaction with the cobalt-containing copper smelting slag, the copper and cobalt in the cobalt-containing copper smelting slag are converted into copper sulfide and cobalt sulfide, that is, they are precipitated at the bottom of the molten pool in the form of copper-cobalt matte melt, and then the copper-cobalt matte melt is subsequently subjected to slow cooling crushing and magnetic separation treatment to separate the copper concentrate and cobalt concentrate.

[0044] According to an embodiment of the present invention, referring to Figure 1 The smoke treatment unit 300 is connected to the smoke outlet 102. For details, refer to Figure 2 The flue gas treatment unit 300 includes a secondary combustion chamber 31, a waste heat boiler 32 and a dust collection chamber 33 which are connected in sequence. The secondary combustion chamber 31 is connected to the flue gas outlet 102 and is suitable for subjecting the flue gas generated in the reduction furnace body to secondary combustion, waste heat recovery and dust collection in sequence before it meets the emission standards.

[0045] According to an embodiment of the present invention, referring to Figure 1 The copper-cobalt matte storage device 400 has a copper-cobalt matte inlet 401 and a copper-cobalt matte particle outlet 402. The copper-cobalt matte inlet 401 is connected to the copper-cobalt matte outlet 104 and is suitable for slowly cooling and crushing the copper-cobalt matte melt obtained in the reduction furnace body to obtain copper-cobalt matte particles. Specifically, for example, the copper-cobalt matte obtained in the reduction furnace body can be cooled first and then crushed.

[0046] According to an embodiment of the present invention, referring to Figure 1The magnetic separation device 500 has a copper-cobalt matte particle inlet 501, a copper concentrate outlet 502 and a cobalt concentrate outlet 503. The copper-cobalt matte particle inlet 501 is connected to the copper-cobalt matte particle outlet 402, and is suitable for magnetically separating the copper-cobalt matte particles obtained above, thereby separating the copper concentrate and the cobalt concentrate, thereby achieving the purpose of effectively and economically separating copper and cobalt.

[0047] According to the reduction furnace for treating cobalt-containing copper smelting slag according to the embodiment of the present invention, a spray gun is used to supply a reducing agent and a sulfiding agent into the reduction furnace to carry out reduction and sulfidation reaction with the cobalt-containing copper smelting slag, so that the copper and cobalt in the cobalt-containing copper smelting slag are converted into copper sulfide and cobalt sulfide, that is, they are settled at the bottom of the molten pool in the form of copper-cobalt matte melt, and then the copper-cobalt matte melt is slowly cooled, crushed and magnetically separated to separate copper concentrate and cobalt concentrate. In addition, by arranging the spray gun obliquely downward in the reduction furnace, on the one hand, the reducing agent and the sulfiding agent can be prevented from being sprayed into the copper-cobalt matte at the bottom of the molten pool, and on the other hand, the slag layer material can be stirred so that the reducing agent and the sulfiding agent are fully in contact with the cobalt-containing copper smelting slag, thereby improving the conversion rate of copper sulfide and cobalt sulfide, and then improving their recovery rate. At the same time, electrodes are used to supply heat to the electric furnace. Compared with using chemical energy of other fossil fuels for heating, oxygen does not need to be supplied to the reduction furnace of the present application, thereby maintaining the reducing atmosphere in the reduction furnace and improving the reduction efficiency of the materials in the furnace.

[0048] In another aspect of the present invention, a method for treating cobalt-containing copper smelting slag using the above reduction furnace is provided. Figure 4 , the method comprising:

[0049] S100: The reducing agent and the sulfiding agent are supplied to the drying equipment for drying, and the obtained mixture is supplied to the slag layer in the reduction furnace through the spray gun, and the cobalt-containing copper smelting slag is supplied to the furnace body at the same time.

[0050] In this step, the reducing agent and the sulfiding agent are supplied to the drying equipment for drying, and the obtained mixture is supplied to the slag layer in the reduction furnace through the spray gun, and the cobalt-containing copper smelting slag is supplied to the furnace body at the same time to obtain smelting slag, flue gas and copper-cobalt matte. Specifically, the mixture containing the reducing agent and the sulfiding agent is dried so that the reducing agent and the sulfiding agent are dried to the water content required for injection, and the efficiency of subsequent reactions is improved. The reducing agent can be at least one of a solid reducing agent, a gas reducing agent and a liquid reducing agent, such as a mixture of hydrogen and carbon monoxide, pulverized coal, etc. The sulfiding agent is at least one selected from copper sulfide ore and cobalt sulfide ore, and the mixing ratio of the reducing agent and the sulfiding agent in the mixture is not particularly limited, as long as the cobalt and copper in the cobalt-containing copper smelting slag can be fully recovered. For example, taking pulverized coal as an example, the mass ratio of the reducing agent and the sulfiding agent is 0.1-0.5, taking the mixture of hydrogen and carbon monoxide as an example, the volume ratio of the reducing agent and the mass ratio of the sulfiding agent is 0.05-0.4, and the present invention The cobalt-containing copper smelting slag requested is derived from the molten cobalt-containing copper smelting slag obtained in the copper ore smelting furnace, which slides into the reduction furnace along the chute through the cobalt-containing copper smelting slag inlet on the furnace body, thereby making full use of the waste heat of the molten cobalt-containing copper smelting slag, thereby reducing the energy consumption in the reduction furnace, and at the same time, electrodes are used in the reduction furnace body to supply heat to the reduction furnace body to maintain the copper-cobalt matte in the copper-cobalt matte layer at the bottom of the molten pool in a molten state. Compared with the use of chemical energy of other fossil fuels for heating, the reduction furnace of the present application does not need to supply oxygen, thereby maintaining the reducing atmosphere in the reduction furnace and improving the reduction efficiency of the materials in the furnace. Thus, by using a spray gun to supply the reducing agent and the sulfiding agent into the reduction furnace to carry out reduction and sulfidation reactions with the cobalt-containing copper smelting slag, the copper and cobalt in the cobalt-containing copper smelting slag are converted into copper sulfide and cobalt sulfide, that is, they are settled to the bottom of the molten pool in the form of copper-cobalt matte melt, and then the copper-cobalt matte melt is subjected to subsequent slow cooling crushing and magnetic separation treatment to separate the copper concentrate and cobalt concentrate, thereby achieving effective and economical separation of copper and cobalt in the cobalt-containing copper smelting slag.

[0051] S200: The flue gas is supplied to the flue gas treatment unit for flue gas treatment and then discharged

[0052] In this step, the flue gas treatment includes secondary combustion, waste heat recovery and dust collection in sequence, that is, the flue gas obtained in the reduction furnace body is subjected to secondary combustion, waste heat recovery and dust collection in sequence before meeting the emission standards.

[0053] S300: Copper-cobalt matte is supplied to the copper-cobalt matte storage device for slow cooling and crushing

[0054] In this step, the copper-cobalt matte obtained above is supplied to a copper-cobalt matte storage device for slow cooling and crushing to obtain copper-cobalt matte particles. Specifically, for example, the copper-cobalt matte obtained in the reduction furnace body can be cooled first and then crushed.

[0055] S400: Copper-cobalt matte particles are fed to the magnetic separation device for magnetic separation

[0056] In this step, the copper-cobalt matte particles are supplied to a magnetic separation device for magnetic separation treatment, thereby separating the copper concentrate and the cobalt concentrate, thereby achieving the purpose of effectively and economically separating copper and cobalt.

[0057] According to the method for treating cobalt-containing copper smelting slag according to an embodiment of the present invention, a reducing agent and a sulfiding agent are supplied into a reduction furnace by a spray gun to carry out reduction and sulfidation reaction with the cobalt-containing copper smelting slag, so that the copper and cobalt in the cobalt-containing copper smelting slag are converted into copper sulfide and cobalt sulfide, that is, they are settled at the bottom of the molten pool in the form of copper-cobalt matte melt, and then the copper-cobalt matte melt is subjected to slow cooling, crushing and magnetic separation treatment to separate copper concentrate and cobalt concentrate. In addition, by arranging the spray gun obliquely downward in the reduction furnace, on the one hand, the reducing agent and the sulfiding agent can be prevented from being sprayed into the copper-cobalt matte at the bottom of the molten pool, and on the other hand, the slag layer material can be stirred so that the reducing agent and the sulfiding agent are fully in contact with the cobalt-containing copper smelting slag, thereby improving the conversion rate of copper sulfide and cobalt sulfide, and then improving their recovery rate. At the same time, electrodes are used to supply heat to the electric furnace. Compared with using chemical energy of other fossil fuels for heating, oxygen does not need to be supplied to the reduction furnace of the present application, thereby maintaining the reducing atmosphere in the reduction furnace and improving the reduction efficiency of the materials in the furnace.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0059] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A reduction furnace for treating cobalt-containing copper smelting slag, characterized in that: include: The reduction furnace body comprises: A furnace body, wherein a feeding area and a molten pool are formed from top to bottom in the furnace body, the feeding area is provided with a cobalt-copper smelting slag inlet and a flue gas outlet, the molten pool forms a slag layer and a copper-cobalt matte layer from top to bottom, the slag layer is provided with a slag outlet, and the copper-cobalt matte layer is provided with a copper-cobalt matte outlet; An electrode, the electrode extending from the top of the furnace body into the slag layer; The blowing device comprises: A drying device, wherein the drying device has a reducing agent inlet, a sulfiding agent inlet and a mixing agent outlet; A spray gun, wherein the spray gun is arranged obliquely downward, and one end of the spray gun is connected to the mixture outlet, and the other end of the spray gun extends from the top of the furnace body into the slag layer; A smoke treatment unit, wherein the smoke treatment unit is connected to the smoke outlet; a copper-cobalt matte storage device, the copper-cobalt matte storage device having a copper-cobalt matte inlet and a copper-cobalt matte particle outlet, the copper-cobalt matte inlet being connected to the copper-cobalt matte outlet; A magnetic separation device is provided, wherein the magnetic separation device has a copper-cobalt matte particle inlet, a copper concentrate outlet and a cobalt concentrate outlet, and the copper-cobalt matte particle inlet is connected to the copper-cobalt matte particle outlet.

2. The reduction furnace according to claim 1, characterized in that: The electrode extends vertically from the center of the top end of the furnace body into the slag layer.

3. The reduction furnace according to claim 1 or 2, characterized in that: The included angle between the spray gun and the furnace body in the height direction is 0 to 45 degrees.

4. The reduction furnace according to claim 3, characterized in that: It comprises a plurality of spray guns, which are arranged in parallel and at intervals.

5. The reduction furnace according to claim 4, characterized in that: The discharge port of the spray gun is close to the drop point of the cobalt-containing copper smelting slag inlet.

6. The reduction furnace according to claim 4 or 5, characterized in that: The spray gun is arranged obliquely toward the electrode.

7. The reduction furnace according to claim 1, characterized in that: The flue gas treatment unit comprises a secondary combustion chamber, a waste heat boiler and a dust collecting chamber which are connected in sequence, and the secondary combustion chamber is connected to the flue gas outlet.

8. A method for treating cobalt-containing copper smelting slag using the reduction furnace according to any one of claims 1 to 7, characterized in that: include: (1) supplying a reducing agent and a sulfiding agent to the drying device for drying, and supplying the obtained mixture to the slag layer in the reduction furnace through the spray gun, and simultaneously supplying cobalt-containing copper smelting slag into the furnace body, so as to obtain smelting slag, flue gas and copper-cobalt matte; (2) supplying the flue gas to the flue gas treatment unit for flue gas treatment and then discharging; (3) supplying the copper-cobalt matte to the copper-cobalt matte storage device for slow cooling and crushing to obtain copper-cobalt matte particles; (4) supplying the copper-cobalt matte particles to the magnetic separation device for magnetic separation treatment to obtain copper concentrate and cobalt concentrate.

9. The method according to claim 8, characterized in that In step (1), the sulfiding agent is at least one selected from copper sulfide ore and cobalt sulfide ore.

10. The method according to claim 8, characterized in that In step (2), the flue gas treatment includes secondary combustion, waste heat recovery and dust removal.

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