Smelting system

Abstract

The utility model discloses a smelting system. The smelting system sequentially comprises a smelting furnace, a converting furnace, a dilution electric furnace and a reduction electric furnace according to the smelting sequence. Copper-nickel sulfide concentrate, lump coal, oxygen-enriched air and the like are subjected to a smelting reaction in a smelting furnace, generated copper-nickel matte enters a converting furnace for converting through a connector, crude copper or high-nickel matte is produced and sent to a subsequent refining procedure for further treatment, converting slag produced by the converting furnace is subjected to sedimentation treatment through a dilution electric furnace, and then a crude copper product or a nickel matte product and dilution electric furnace slag are obtained; and after the depleted electric furnace slag is treated by a reduction electric furnace, copper-nickel alloy and waste slag can be obtained. According to the equipment, high-copper and low-nickel copper-nickel sulfide concentrate can be treated, and a crude copper product and a copper-nickel alloy are obtained; and high-nickel and low-copper sulphide copper-nickel concentrate can also be treated, and high-nickel matte and copper-nickel alloy products are obtained. The device has the advantages of wide raw material adaptability, high working condition adjusting capability and continuous and stable production.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of metal smelting, and particularly relates to a smelting system. BACKGROUND

[0002] Traditional smelting processes of copper-nickel sulfide concentrates mainly include roasting-electric furnace smelting-converter blowing-smelter slag electric furnace depletion, steam drying-flash smelting-converter blowing-smelter slag electric furnace depletion, and sintering-blast furnace smelting-converter blowing-smelter slag electric furnace depletion. The smelter slag after depletion treatment is usually directly discarded, resulting in a low acquisition rate of copper and nickel. CONTENT OF THE UTILITY MODEL

[0003] The technical problem to be solved by the application is that the traditional smelting process has a low acquisition rate of copper and nickel. To solve the technical problem, the application provides a smelting system capable of improving the acquisition rate of copper and nickel in copper-nickel sulfide concentrates.

[0004] The technical scheme provided by the application is as follows:

[0005] A smelting system comprises:

[0006] a smelting furnace;

[0007] a blowing furnace arranged downstream of the smelting furnace and connected with a discharge end of the smelting furnace;

[0008] a depletion electric furnace arranged downstream of the blowing furnace and connected with a slag discharge end of the blowing furnace;

[0009] a reduction electric furnace arranged downstream of the depletion electric furnace and connected with a slag discharge end of the depletion electric furnace.

[0010] The smelting system is used to directly place raw materials in the smelting furnace for smelting, then input copper-nickel matte generated in the smelting furnace into the blowing furnace for blowing, input blowing slag into the depletion electric furnace for settlement treatment after the blowing, and input the smelter slag into the reduction electric furnace for reduction treatment after the settlement treatment. In this way, the reduction electric furnace can reduce copper and nickel in the smelter slag into copper-nickel alloy, thereby effectively improving the acquisition rate of copper and nickel in the concentrate.

[0011] Further, the smelting system further comprises a first connector, one end of the first connector is connected with the discharge end of the smelting furnace, and the other end of the first connector is connected with the blowing furnace.

[0012] Further, the first connector is provided with a connecting groove, and the connecting groove penetrates through opposite ends of the first connector.

[0013] Further, the smelting system further comprises a second connector, one end of the second connector is connected with the slag discharge end of the blowing furnace, and the other end of the second connector is connected with the depletion electric furnace.

[0014] Further, a third connector is further included, one end of the third connector is connected with the slagging end of the dephosphorization electric furnace, and the other end is connected with the reduction electric furnace.

[0015] Further, a gas supply mechanism is further included, the gas supply mechanism is connected with the smelting furnace.

[0016] Further, a plurality of lances are arranged on the top of the converting furnace.

[0017] Further, each of the lances is capable of self-rotation.

[0018] Further, a raw material conveying device is further included, the raw material conveying device is connected with the smelting furnace.

[0019] Further, a flue gas treatment device is further included, the flue gas treatment device is connected with the smelting furnace, the converting furnace, the dephosphorization electric furnace and the reduction electric furnace. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application and explain the technical solutions of the present application, and do not constitute a limitation on the present application.

[0021] Figure 1 A structural schematic diagram of a smelting system according to an embodiment of the present application is provided;

[0022] Figure 2 A process flow schematic diagram of a smelting system according to an embodiment of the present application is provided.

[0023] Label explanation:

[0024] 110, smelting furnace; 120, converting furnace; 121, lance; 130, dephosphorization electric furnace; 140, reduction electric furnace; 151, first connector; 152, second connector; 153, third connector; 161, flat car; 162, slag air quenching. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0027] The present application provides a smelting system for processing copper-nickel sulfide concentrate. As shown in one embodiment, the smelting system includes a smelting furnace 110, a converting furnace 120, a leaner furnace 130, and a reduction furnace 140. Figure 1

[0028] The smelting furnace 110 is used for smelting raw materials; the converting furnace 120 is arranged downstream of the smelting furnace 110 and connected with the discharge end of the smelting furnace 110 to obtain copper-nickel matte produced by the smelting furnace 110 and perform converting on the copper-nickel matte. The leaner furnace 130 is arranged downstream of the converting furnace 120 and connected with the slag discharge end of the converting furnace 120 to obtain converting slag produced by the converting furnace 120 and perform settling treatment on the converting slag. The reduction furnace 140 is arranged downstream of the leaner furnace 130 and connected with the slag discharge end of the leaner furnace 130 to obtain furnace slag produced by the leaner furnace 130 and perform reduction treatment on the furnace slag.

[0029] By using the above smelting system, the raw materials are directly placed in the smelting furnace 110 for smelting, then the produced copper-nickel matte is input into the converting furnace 120 for converting, after the converting is completed, the converting slag is input into the leaner furnace 130 for settling treatment, and after the settling treatment is completed, the furnace slag is input into the reduction furnace 140 for reduction treatment. In this way, the reduction furnace 140 can reduce the copper and nickel in the furnace slag into copper-nickel alloy, thereby effectively improving the acquisition rate of copper and nickel in the concentrate.

[0030] In one embodiment, the smelting system further includes a first connector 151, a second connector 152, and a third connector 153. One end of the first connector 151 is connected with the discharge end of the smelting furnace 110, and the other end is connected with the converting furnace 120, so as to input the copper-nickel matte produced by the smelting furnace 110 into the converting furnace 120; one end of the second connector 152 is connected with the slag discharge end of the converting furnace 120, and the other end is connected with the leaner furnace 130, so as to input the converting slag into the leaner furnace 130; one end of the third connector 153 is connected with the slag discharge end of the leaner furnace 130, and the other end is connected with the reduction furnace 140, so as to input the furnace slag of the leaner furnace 130 into the reduction furnace 140.

[0031] ​In one embodiment, the first connector 151 is provided with a connecting groove, which penetrates through opposite ends of the first connector 151, so that copper-nickel matte can be input into the converter 120 through the connecting groove. Further, the first connector 151 is in the shape of a long strip and is made of copper. Similarly, the second connector 152 and the third connector 153 have the same structure and material as the first connector 151 and are also provided with a connecting groove.

[0032] In one embodiment, the smelting system further comprises a raw material conveying device, which is connected with the smelting furnace 110 and is used to input raw materials, such as copper-nickel sulfide concentrate, into the smelting furnace 110. It should be noted that the raw material conveying device can also input other materials required in the smelting process, such as lump coal, into the smelting furnace 110.

[0033] Similarly, the smelting system can also be provided with other material adding mechanisms for adding materials required by the converter 120, the leaner electric furnace 130, and the reduction electric furnace 140. In addition, if different furnaces need to add the same material, the same adding mechanism can be used for adding, which is not limited herein.

[0034] In one embodiment, the smelting system further comprises a gas supply mechanism, which is connected with the smelting furnace 110 to provide oxygen-enriched air for the smelting furnace 110.

[0035] In one embodiment, the top of the converter 120 is provided with a plurality of lances 121, that is, oxygen-enriched air is input into the converter 120 through the top lances 121 to perform the converting reaction on the copper-nickel matte. Further, each lance 121 can rotate by itself to make the gas blown in the furnace form a more extensive and uniform distribution, thereby optimizing the reaction effect.

[0036] In one embodiment, the smelting system further comprises a flue gas treatment device, which is connected with the smelting furnace 110, the converter 120, the leaner electric furnace 130, and the reduction electric furnace 140 to obtain flue gas generated in each furnace and recycle and utilize the substances in the flue gas, thereby improving the resource utilization rate.

[0037] It should be noted that the smelting system in the above embodiment can process copper-nickel sulfide concentrates with different copper-nickel contents. For the concentrate with high copper and low nickel, the copper content is 15-25%, and the nickel content is 0-3%. Correspondingly, the copper content in the copper-nickel matte generated in the smelting furnace 110 is 55-75%, and the nickel content is 0-7%. After the converting reaction, the converter 120 generates crude copper with a copper content of 95-99% and converting slag. After the settling treatment of the converting slag in the leaner electric furnace 130, crude copper with a copper content of 95-99% and furnace slag are obtained. The furnace slag is reduced in the reduction electric furnace 140 to obtain a copper-nickel alloy product. For details, please refer to Example 1.

[0038] For copper low nickel high concentrate, copper content is 1-5%, nickel content is 4-10%, and the copper content in the copper-nickel matte produced in the smelting furnace 110 is 0-10%, and the nickel content is 10-20%; after the blowing reaction, the high-nickel matte with copper content of 5-30% and nickel content of 45-75% and the blowing slag are produced in the blowing furnace 120; after the blowing slag is treated by sedimentation in the lean electric furnace 130, the high-nickel matte with nickel content of 45-75% and copper content of 5-30% and the slag are obtained; the slag is reduced in the reduction electric furnace 140 to obtain copper-nickel alloy, and the sum of the contents of copper and nickel in the copper-nickel alloy is >30%. For details, please refer to Example 2.

[0039] In order to facilitate the scheme of the present application immediately, in combination with Figure 2 And the process flow of the smelting system in the above embodiment is described by two specific examples:

[0040] Example 1

[0041] S1, the copper-nickel sulfide concentrate (copper content is 25%, nickel content is 2%) and the lump coal are input into the smelting furnace 110, and the oxygen-enriched air is input for smelting reaction. The copper-nickel matte generated in the smelting furnace 110 has a copper content of 72% and a nickel content of 4%.

[0042] The smelting furnace 110 inputs 80% oxygen concentration oxygen-enriched air into the molten pool area from the side lower part of the furnace body to smelt the copper-nickel sulfide concentrate, and the sulfur in the concentrate reacts with the oxygen-enriched air to generate SO2 into the flue gas area, which can enter the flue gas system or acid making later. The iron and quartz sand in the concentrate undergo slagging reaction into the slag layer; the smelting slag generated in the smelting furnace 110 is discharged through the chute and transported to the beneficiation treatment by the flat car 161.

[0043] S2, the copper-nickel matte generated in the smelting furnace 110 is input into the blowing furnace 120, and the copper-nickel matte is blown in the blowing furnace 120. The blowing furnace 120 can produce a copper content of 98% of the crude copper product.

[0044] In the blowing furnace 120, the oxygen-enriched air is input into the copper-nickel matte through the multiple lances 121 at the top of the furnace body to perform blowing reaction, and the copper-nickel matte and the oxygen-enriched air react to generate oxidation slagging and desulfurization reaction. Most of the copper enters the crude copper layer, and a small part of the copper and all the nickel enter the blowing slag.

[0045] S3, the blowing slag in the blowing furnace 120 is discharged to the lean electric furnace 130, and the copper content in the blowing slag is 35% and the nickel content is 14%. After entering the lean electric furnace 130, the mechanically included copper in the blowing slag naturally precipitates into the crude copper layer.

[0046] S4, the slag generated in the lean electric furnace 130 is input into the reduction electric furnace 140 for reduction smelting.

[0047] Specifically, the slag is reacted with the lump coal in the reduction electric furnace 140, in which the copper and nickel are reduced into a copper-nickel alloy product, the sum of the contents of copper and nickel in the alloy is 50%, and the slag in the reduction electric furnace 140 is discarded after being granulated by slag air quenching 162.

[0048] Example 2

[0049] The equipment in Example 2 is the same as that in Example 1, except that the contents of nickel and copper in the copper-nickel sulfide concentrate are different.

[0050] S1, the copper-nickel sulfide concentrate (the content of copper is 2% and the content of nickel is 6%) and the lump coal are input into the smelting furnace 110 and input into the oxygen-enriched air for smelting reaction. The copper-nickel matte generated in the smelting furnace 110 has a copper content of 6% and a nickel content of 20%.

[0051] S2, the copper-nickel matte is input into the converting furnace 120, and the copper-nickel matte is subjected to converting reaction in the converting furnace 120, which can produce nickel matte with a nickel content of 55% and a copper content of 12%, which can be refined again subsequently.

[0052] S3, the converting slag is discharged to the lean electric furnace 130, and after entering the lean electric furnace 130, the nickel matte mechanically included in the converting slag is naturally precipitated to obtain high-nickel matte with a nickel content of 55% and a copper content of 12%.

[0053] S4, the slag generated by the lean electric furnace 130 is input into the reduction electric furnace 140.

[0054] Specifically, the slag is reacted with the lump coal in the reduction electric furnace 140, in which the copper and nickel are reduced into a copper-nickel alloy product, the sum of the contents of copper and nickel in the alloy is 65%, and the slag in the reduction electric furnace 140 is discarded after being granulated by slag air quenching 162.

[0055] In summary, the smelting system provided by the present application can not only process high-copper and low-nickel copper-nickel sulfide concentrate and obtain crude copper product and copper-nickel alloy, but also process high-nickel and low-copper copper-nickel sulfide concentrate and obtain high-nickel matte and copper-nickel alloy, which has wide adaptability to raw materials, strong process adjustment capability and continuous and stable production process.

[0056] Although the embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A smelting system, characterized in that, include: Smelting furnace; A blowing furnace is located downstream of the smelting furnace and connected to the discharge end of the smelting furnace; A lean-firing electric furnace is located downstream of the blowing furnace and connected to the slag discharge end of the blowing furnace. A reduction electric furnace is located downstream of the depletion electric furnace and connected to the slag discharge end of the depletion electric furnace.

2. The smelting system according to claim 1, characterized in that, It also includes a first connector, one end of which is connected to the discharge end of the smelting furnace, and the other end of which is connected to the blowing furnace.

3. The smelting system according to claim 2, characterized in that, The first connector has a connecting groove that extends through both ends of the first connector.

4. The smelting system according to claim 1, characterized in that, It also includes a second connector, one end of which is connected to the slag discharge end of the blowing furnace, and the other end is connected to the lean-burning electric furnace.

5. The smelting system according to claim 1, characterized in that, It also includes a third connector, one end of which is connected to the slag discharge end of the depletion electric furnace, and the other end is connected to the reduction electric furnace.

6. The smelting system according to claim 1, characterized in that, It also includes a gas supply mechanism, which is connected to the smelting furnace.

7. The smelting system according to claim 1, characterized in that, The top of the blowing furnace is equipped with multiple spray guns.

8. The smelting system according to claim 7, characterized in that, Each of the spray guns described is capable of rotation.

9. The smelting system according to claim 1, characterized in that, It also includes a raw material conveying device, which is connected to the smelting furnace.

10. The smelting system according to claim 1, characterized in that, It also includes a flue gas treatment device, which is connected to the smelting furnace, the blowing furnace, the leaning electric furnace and the reduction electric furnace.

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