Mineral processing technology for recovering copper from copper pyrometallurgy slag

Abstract

The invention relates to the technical field of secondary resource recovery of smelting slag, in particular to a beneficiation process for recovering copper from copper pyrometallurgy slag, which comprises the following steps: carrying out ore grinding operation I on the crushed copper pyrometallurgy slag, and then carrying out roughing operation I to obtain concentrate and tailings, and the obtained concentrate is a copper concentrate product I; rough concentrate and tailings are obtained after the tailings are subjected to roughing operation II; the obtained rough concentrate is subjected to concentration operation I, concentration operation II, concentration operation III, fine scavenging operation I and fine scavenging operation II; according to the method, ore grinding and magnetic separation are conducted on the tailings after scavenging II, tailings reduction operation is achieved, most iron minerals are thrown away, the influence of the tailings on copper mineral flotation is reduced, a good premise is provided for scavenging III operation in the aspects of agent consumption, agent selectivity and the like, and finally the copper content in the tailings II is reduced; and the technical index of copper flotation can be effectively improved, and efficient recycling of copper resources is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of secondary resource recovery of smelting slag, and particularly relates to an ore dressing process for recovering copper from copper pyrometallurgical slag. BACKGROUND

[0002] Copper produced by pyrometallurgy accounts for 95% of the total copper production in China. According to relevant statistics, the annual copper production in China is more than 4.79 million tons, and the copper smelting slag produced is more than 9.58-14.37 million tons. The considerable quantity and the high copper content in the copper pyrometallurgical slag make the copper pyrometallurgical slag have a very significant resource property. The recovery and utilization of the copper pyrometallurgical slag by using the ore dressing technology has unique advantages in terms of process, investment cost, process structure, production control and the like. Therefore, the recovery and utilization of the copper in the copper pyrometallurgical slag by using the ore dressing technology can improve the self-sufficiency rate of copper resources, effectively reduce the storage of smelting slag, and has important significance in terms of efficient comprehensive utilization of secondary resources and environmental friendliness.

[0003] The copper pyrometallurgical slag is formed in a high-temperature environment, and its composition is relatively complex, mainly including copper sulfide, magnetite, silicate mineral and glass body and the like. Specifically, the main minerals in the copper pyrometallurgical slag are fayalite and magnetite, and a small amount of pyrrhotite, the silicate mineral is mainly fayalite, and the second is pyroxene; the copper is mainly in the form of copper sulfide mineral, mainly including digenite, chalcocite, chalcopyrite, bornite and metallic copper. The copper mineral is often embedded together with the fayalite matrix and magnetite, or is wrapped by magnetite in a spherical shape. The particle size of the copper mineral and the iron mineral varies greatly with the composition of the smelting slag.

[0004] At present, many copper smelting enterprises in China have carried out ore dressing production practice, and researchers in the industry have also carried out a large amount of experimental research on improving the ore dressing technical index. Especially today, with the increasing demand for efficient recovery and utilization of resources, the research on the ore dressing technology of copper pyrometallurgical slag has become a hot topic. However, based on the unique properties of the pyrometallurgical slag, including fine and uneven embedded particle size, and close intergrowth of copper minerals and other minerals, it is difficult to maintain and improve the index of the copper pyrometallurgical slag, which directly affects the economic benefits of production enterprises.

[0005] The influence of the resource characteristics of copper pyrometallurgy slag on the technical indexes of the beneficiation process is specifically manifested in two aspects of low copper concentrate grade and high copper content in the tailings. The pyrometallurgy slag contains many metal elements and mineral types, and the copper minerals are unevenly embedded. In the flotation process, a certain requirement is required for the fineness. When the grinding fineness is coarse, the dissociation is insufficient, and when the grinding fineness is fine, the dissociation is relatively sufficient. However, in this process, a large amount of other minerals are overground to form a composition similar to slurry, and other metal ions are dispersed in the slurry system, which affects the collection and enrichment of copper minerals and affects the continuity and stability of production. Therefore, it is necessary to carry out beneficiation process technology research on the copper pyrometallurgy slag, and it is necessary to efficiently and comprehensively utilize the secondary resources of the copper pyrometallurgy slag. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a beneficiation process for recovering copper from copper pyrometallurgy slag, which reduces the amount of tailings and efficiently recovers copper resources.

[0007] To solve the above problems, the beneficiation process for recovering copper from copper pyrometallurgy slag according to the present application comprises the following steps: S1: performing roughing operation I on the crushed copper pyrometallurgy slag after grinding operation I to obtain concentrate and tailings, wherein the obtained concentrate is copper concentrate product I; S2: obtaining the tailings obtained in step S1, performing roughing operation II to obtain rough concentrate and tailings; S3: obtaining concentrate product II and tailings product I by performing cleaning operation I, cleaning operation II, cleaning operation III, cleaning operation I and cleaning operation II on the rough concentrate obtained in step S2; S4: performing grinding operation III and magnetic separation on the tailings obtained in step S2 after performing scavenging operation I and scavenging operation II to obtain magnetic separation concentrate and magnetic separation tailings; S5: obtaining scavenging tailings by performing scavenging operation III on the magnetic separation tailings obtained in step S4, and combining the magnetic separation concentrate and the scavenging tailings into tailings product II.

[0008] In the above step S3, the middlings of the cleaning operation II, the cleaning operation III, the cleaning operation I and the cleaning operation II are returned to the cleaning operation I through grinding operation II to form a cycle.

[0009] In the above step S4, the concentrate produced by the scavenging operation I is returned to the roughing operation I in step S1, and the concentrate produced by the scavenging operation II is returned to the scavenging operation I in step S2.

[0010] In the above step S1, the grinding fineness of grinding operation I is 70%-85% of-200 mesh.

[0011] The grinding fineness of grinding operation II is 75%-85% of-325 mesh.

[0012] In step S4 above, the fineness of grinding operation III is -325 mesh, accounting for 80%-90%.

[0013] In step S4 above, the magnetic field strength of the magnetic separation is 1800 Oe to 20000 Oe.

[0014] Xanthate collector and pine oil foaming agent were added in all the above-mentioned roughing operation I, roughing operation II, scavenging operation I, scavenging operation II, fine scavenging operation I and fine scavenging operation II.

[0015] During the above-mentioned sweeping operation III separation process, xanthate collector and Z-200 foaming agent are added.

[0016] Compared with the prior art, the present invention has the following advantages: 1. This invention addresses the unevenly distributed copper minerals in pyrometallurgical slag, and, based on the properties of the original ore and its beneficiation characteristics, steps to dissociate and collect copper minerals, producing a concentrate product.

[0017] 2. This invention performs grinding on the middlings of the fined minerals, further finely grinding the intergrowths in the fined minerals to achieve monomer liberation, thereby avoiding the mixing of impurity minerals into concentrate product II and improving the quality of concentrate product II.

[0018] 3. This invention grinds and magnetically separates the tailings product after scavenging operation II, realizing tailings reduction operation, removing most of the iron minerals, reducing their impact on copper mineral flotation, providing a good premise for scavenging operation III in terms of reagent consumption and reagent selectivity, and ultimately reducing the copper content in tailings II, which can effectively improve the copper flotation technical indicators and is conducive to the efficient recovery and utilization of copper resources. Attached Figure Description

[0019] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0020] Figure 1 This is a process flow diagram of an embodiment of the present invention. Detailed Implementation

[0021] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0022] Example 1: As Figure 1 As shown in the figure, this invention discloses a mineral processing technology for recovering copper from copper pyrometallurgical slag, comprising the following steps: S1: After grinding the crushed copper pyrometallurgical slag, roughing operation I is carried out to obtain concentrate and tailings, wherein the obtained concentrate is copper concentrate product I. S2: The tailings obtained in step S1 are subjected to roughing operation II to obtain rough concentrate and tailings; S3: After the rough concentrate obtained in step S2 is processed through fine cleaning operation I, fine cleaning operation II, fine cleaning operation III, fine scavenging operation I and fine scavenging operation II, concentrate product II and tailings product I are obtained; S4: The tailings obtained in step S2 are subjected to scavenging operations I and II, followed by grinding operations III and magnetic separation to obtain magnetic concentrate and magnetic tailings. Thus, grinding operations III are performed on the tailings obtained from roughing operation II after scavenging operations I and II to further liberate the finer-grained copper minerals and perform magnetic separation to discard the tailings. This reduces the processing volume of subsequent scavenging operation III, effectively improving the unit processing capacity. The froth product from scavenging operation III is returned to roughing operation I, where it is enriched in concentrate product I through the "arching" effect with coarse-grained copper minerals, ultimately reducing the loss of copper metal in the tailings. S5: After the magnetic separation tailings obtained in step S4 are subjected to scavenging operation III, scavenged tailings are obtained. The magnetic separation concentrate and scavenged tailings are combined into tailings product II.

[0023] In step S3, the middlings from Cleaning Operation II, Cleaning Operation III, Scavenging Operation I, and Scavenging Operation II are returned to Cleaning Operation I via Grinding Operation II, forming a cycle. Thus, the middlings from Cleaning Operation II, Cleaning Operation III, Scavenging Operation I, and Scavenging Operation II are combined and subjected to Grinding Operation II to further liberate intergrowths and other minerals with slower flotation speeds and poorer reagent effects in the entire cleaning process before returning them to Cleaning Operation I, thereby improving the copper grade of concentrate product II.

[0024] In step S4, the concentrate produced by scavenging operation I is returned to roughing operation I in step S1, and the concentrate produced by scavenging operation II is returned to scavenging operation I in step S2. Therefore, In step S1, grinding operation I has a fineness of -200 mesh accounting for 70%-85%. Grinding operation II has a fineness of -325 mesh accounting for 75%-85%. In step S4, grinding operation III has a fineness of -325 mesh accounting for 80%-90%. Therefore, by using different grinding finenesses in different operation stages, the liberation of copper minerals with different particle sizes can be selectively achieved, minimizing mud formation and eliminating the influence of native slime and inevitable ions on copper mineral flotation.

[0025] In step S4, the magnetic field strength of the magnetic separation is 1800 Oe to 20000 Oe.

[0026] In the roughing process (I), roughing process (II), scavenging process (I), scavenging process (II), fine scavenging process (I), and fine scavenging process (II), xanthate collector and pine oil foaming agent are added. Thus, through the adsorption of the reagents on the double electric layer of the copper minerals, the hydrophobic copper minerals float to the surface and accumulate in the foam, achieving separation.

[0027] In the scavenging operation III separation process, xanthate collector and Z-200 frother are added. Z-200 frother is O-isopropyl-N-ethylthiocarbamate. Through the high selectivity of the ester reagent Z200 for copper minerals, the collection and enrichment of copper minerals in this step are further enhanced.

[0028] The roughing operation I of this invention can implement a relatively coarse grinding fineness based on the copper grade and dispersive relationship of the raw copper smelting slag. This achieves the liberation of coarse-grained dispersive minerals while avoiding over-grinding of coarse-grained minerals, and can produce a high-copper-grade concentrate product I in a timely manner and flexibly according to the concentrate grade requirements. The rough concentrate produced in the roughing operation II undergoes a two-step fine scavenging operation to enhance the collection of intergrowth minerals with a larger specific gravity during the low-concentration flotation operation. At the same time, the middlings from the cleaning operations II, III, I, and II are subjected to a grinding operation II. While capturing and enriching, further dissociation is carried out, and the residue is returned to the finer concentrate I operation, ultimately improving the copper grade in concentrate II. The tailings obtained after roughing II tailings through scavenging I and scavenging II operations are ground in the third operation and then subjected to magnetic separation. On the one hand, iron minerals in the smelting slag can be ground and discarded in time to reduce the amount of tailings. On the other hand, more fine copper minerals such as encapsulated and disseminated minerals can be further dissociated. By strengthening the capture of these copper minerals, the copper content in tailings II can be reduced, thus reducing copper loss in the tailings.

[0029] Example 2: This embodiment of the invention discloses a beneficiation process for recovering copper from copper pyrometallurgical slag, including the following process parameters: flash furnace copper smelting slag, containing 2.53% copper; grinding operation I with a fineness of -200 mesh accounting for 70%; copper smelting after roughing operation I produces copper concentrate product I and roughing operation I tailings; the roughing operation I tailings are subjected to roughing operation II; the rough concentrate obtained from roughing operation II is subjected to three cleaning operations and two fine scavenging operations to obtain copper concentrate product II and tailings I, wherein cleaning operation II and fine scavenging operation II... The middlings from coarse ore processing operations III, fine scavenging operations I, and fine scavenging operations II are returned to fine ore processing operation I after grinding in operation II (75% fineness: -325 mesh). The tailings from roughing operation II, after scavenging in operations I and II, are ground in operation III (80% fineness: -325 mesh) and then subjected to magnetic separation (magnetic field strength 2000 Oe). The magnetically separated tailings are then subjected to scavenging in operation III. The concentrate from scavenging in operation III is returned to roughing operation I. The tailings from scavenging in operation III and the magnetically separated concentrate are combined into tailings II. During the process, butyl xanthate collector and pine oil frother are added to roughing operation I, roughing operation II, scavenging operation I, scavenging operation II, fine scavenging operation I, and fine scavenging operation II. The dosage of butyl xanthate is 650 g / t, and the dosage of pine oil is 200 g / t. The dosage of butyl xanthate is 60 g / t, and the dosage of Z200 is 20 g / t in scavenging operation III.

[0030] The closed-circuit test results were analyzed, tested, and calculated for each product. The results are shown in the table below.

[0031] Table 1 Comparison of Experimental Results / % In the original scheme, 70% of the grinding particles in the first stage were -200 mesh. Roughing operation I produced copper concentrate product I. The rough concentrate from roughing operation II underwent three cleaning operations and two scavenging operations to obtain copper concentrate product II and tailings. The middlings from cleaning operations I, scavenging operations I, and scavenging operations II were combined and returned to the first stage of grinding. Compared to the original scheme where middlings from cleaning operations II and III were returned sequentially, the original scheme resulted in copper content of 21.45% in concentrate I, 15.08% in concentrate II, and 0.28% in tailings, with a total copper concentrate recovery rate of 90.21%. Compared to the original scheme, the copper recovery rate increased by 1.48 percentage points, and the copper content in the tailings decreased by 0.044 percentage points.

[0032] Example 3: This embodiment of the invention discloses a beneficiation process for recovering copper from copper pyrometallurgical slag, including the following process parameters: flash furnace copper smelting slag, containing 2.17% copper; grinding operation I with a fineness of -200 mesh (85%); copper smelting after roughing operation I produces copper concentrate product I and roughing operation I tailings; the tailings from roughing operation I are subjected to roughing operation II; the rough concentrate obtained from roughing operation II undergoes three cleaning operations and two fine scavenging operations to obtain copper concentrate product II and tailings I; the middlings from cleaning operation II, cleaning operation III, fine scavenging operation I, and fine scavenging operation II are ground in operation II (fineness of -325 mesh (80%) and returned to cleaning operation I; the tailings from roughing operation II, after scavenging operation I and scavenging operation II, are ground in operation III (fineness of -325 mesh (85%)) and then subjected to magnetic separation (magnetic field strength 3500). Oe), the magnetic separation tailings are subjected to scavenging operation III. The concentrate from scavenging operation III is returned to roughing operation I. The tailings from scavenging operation III and the magnetic separation concentrate are combined into tailings II. During the process, butyl xanthate collector and pine oil frother are added to roughing operation I, roughing operation II, scavenging operation I, scavenging operation II, fine scavenging operation I, and fine scavenging operation II. The dosage of butyl xanthate is 500g / t, and the dosage of pine oil is 180g / t. The dosage of butyl xanthate is 50g / t, and the dosage of Z200 is 20g / t in scavenging operation III.

[0033] The closed-circuit test results were analyzed, tested, and calculated for each product. The results are shown in the table below.

[0034] Table 2 Comparison of Experimental Results / % In the original system, 85% of the grinding particles were -200 mesh. Roughing operation I produced copper concentrate product I. The rough concentrate from roughing operation II underwent three cleaning operations and two scavenging operations to obtain copper concentrate product II and tailings. The middlings from cleaning operations I, scavenging operations I, and scavenging operations II were combined and returned to the first-stage grinding unit. Compared to the original system where middlings from cleaning operations II and III were returned sequentially, the original system resulted in copper content of 19.59% in concentrate I, 15.14% in concentrate II, and 0.26% in tailings, with a total copper concentrate recovery rate of 89.31%. Compared to the original system, the copper recovery rate increased by 1.44 percentage points, and the copper content in the tailings decreased by 0.036 percentage points.

[0035] Example 4: This embodiment of the invention discloses a beneficiation process for recovering copper from copper pyrometallurgical slag, including the following process parameters: converter copper smelting slag, containing 4.29% copper; grinding operation I with a fineness of -200 mesh accounting for 80%; copper smelting after roughing operation I produces copper concentrate product I and roughing operation I tailings; the roughing operation I tailings are subjected to roughing operation II; the rough concentrate obtained from roughing operation II is subjected to three cleaning operations and two fine scavenging operations to obtain copper concentrate product II and tailings I, wherein cleaning operation II, cleaning operation II, and fine scavenging operation II... The middlings from Operation III, Scavenging Operation I, and Scavenging Operation II are returned to Cleaning Operation I after grinding in Operation II (80% fineness: -325 mesh). The tailings from Roughing Operation II, after Scavenging Operations I and II, are ground in Operation III (90% fineness: -325 mesh) and then subjected to magnetic separation (magnetic field strength 6000 Oe). The magnetically separated tailings are then subjected to Scavenging Operation III. The concentrate from Scavenging Operation III is returned to Roughing Operation I. The tailings from Scavenging Operation III and the magnetically separated concentrate are combined into Tailings II. During the process, butyl xanthate collector and pine oil frother are added to Roughing Operation I, Roughing Operation II, Scavenging Operation I, Scavenging Operation II, Scavenging Operation I, and Scavenging Operation II. The dosage of butyl xanthate is 750 g / t, and the dosage of pine oil is 250 g / t. The dosage of butyl xanthate is 80 g / t, and the dosage of Z200 is 30 g / t in Scavenging Operation III.

[0036] The results of the analysis, testing and calculation of each product are shown in the table below.

[0037] Table 3 Comparison of Experimental Results / % In the original scheme, 80% of the grinding particles were -200 mesh. Roughing operation I produced copper concentrate product I. The rough concentrate from roughing operation II underwent three cleaning operations and two scavenging operations to obtain copper concentrate product II and tailings. The middlings from cleaning operations I, scavenging operations I, and scavenging operations II were combined and returned to the first-stage grinding unit. Compared to the original scheme where middlings from cleaning operations II and III were returned sequentially, the original scheme resulted in concentrate I containing 28.44% copper, concentrate II containing 18.83% copper, and tailings containing 0.47% copper, with a total copper concentrate recovery rate of 90.64%. Compared to the original scheme, the copper recovery rate increased by 1.65 percentage points, and the copper content in the tailings decreased by 0.083 percentage points.

[0038] Example 5: This embodiment of the invention discloses a beneficiation process for recovering copper from copper pyrometallurgical slag, including the following process parameters: a mixed slag of converter copper smelting slag and flash furnace copper smelting slag, containing 2.87% copper; grinding operation I with a fineness of -200 mesh (85%); copper smelting slag undergoes roughing operation I to produce copper concentrate product I and roughing operation I tailings; the tailings from roughing operation I undergo roughing operation II; the rough concentrate obtained from roughing operation II undergoes three cleaning operations and two fine scavenging operations to obtain copper concentrate product II and tailings I; the middlings from cleaning operations II, cleaning operations III, fine scavenging operations I, and fine scavenging operations II are ground in operation II (fineness of -325 mesh (85%) and returned to cleaning operation I; the tailings from roughing operation II undergo scavenging operations I and II, and the resulting tailings undergo grinding in operation III (fineness of -325 mesh (90%)) followed by magnetic separation (magnetic field strength 8000). Oe), the magnetic separation tailings are subjected to scavenging operation III. The concentrate from scavenging operation III is returned to roughing operation I. The tailings from scavenging operation III and the magnetic separation concentrate are combined into tailings II. During the process, butyl xanthate collector and pine oil frother are added to roughing operation I, roughing operation II, scavenging operation I, scavenging operation II, fine scavenging operation I, and fine scavenging operation II. The dosage of butyl xanthate is 680g / t and the dosage of pine oil is 200g / t. The dosage of butyl xanthate in scavenging operation III is 60g / t and the dosage of Z200 is 20g / t.

[0039] The results of the analysis, testing and calculation of each product are shown in the table below.

[0040] Table 4 Comparison of Experimental Results / % In the original system, 85% of the grinding particles were -200 mesh. Roughing operation I produced copper concentrate product I. The rough concentrate from roughing operation II underwent three cleaning operations and two scavenging operations to obtain copper concentrate product II and tailings. The middlings from cleaning operations I, scavenging operations I, and scavenging operations II were combined and returned to the first-stage grinding unit. Compared to the original system where middlings from cleaning operations II and III were returned sequentially, the original system resulted in concentrate I containing 24.46% copper, concentrate II containing 16.93% copper, and tailings containing 0.33% copper, with a total copper concentrate recovery rate of 89.76%. Compared to the original system, the copper recovery rate increased by 1.47 percentage points, and the copper content in the tailings decreased by 0.047 percentage points.

[0041] Example 6: This embodiment of the invention discloses a beneficiation process for recovering copper from copper pyrometallurgical slag, including the following process parameters: a mixed slag of converter copper smelting slag and flash furnace copper smelting slag, containing 3.09% copper; grinding operation I with a fineness of -200 mesh accounting for 75%; copper smelting slag undergoes roughing operation I to produce copper concentrate product I and roughing operation I tailings; the tailings from roughing operation I undergo roughing operation II; the rough concentrate obtained from roughing operation II undergoes three cleaning operations and two fine scavenging operations to obtain copper concentrate product II and tailings I, wherein the cleaning operation... The middlings from Process II, Process III, and Process I and Process II are returned to Process I after grinding in Process II (80% fineness: -325 mesh). The tailings from Roughing Process II, after passing through Process I and Process II, are ground in Process III (85% fineness: -325 mesh) and then subjected to magnetic separation (magnetic field strength 12000 Oe). The magnetically separated tailings are then subjected to Process III. The concentrate from Process III is returned to Roughing Process I. The tailings from Process III and the magnetically separated concentrate are combined into Tailings II. During the process, butyl xanthate collector and pine oil frother are added to Roughing Process I, Roughing Process II, Process I, Process II, Process I, Process II, Process I, and Process II. In Process III, butyl xanthate collector and pine oil frother are added at a dosage of 750 g / t and pine oil at a dosage of 200 g / t. In Process III, butyl xanthate collector is added at a dosage of 80 g / t and Z200 frother is added at a dosage of 20 g / t.

[0042] The results of the analysis, testing and calculation of each product are shown in the table below.

[0043] Table 5 Comparison of Experimental Results / % In the original system, 75% of the grinding particles were -200 mesh. Roughing operation I produced copper concentrate product I. The rough concentrate from roughing operation II underwent three cleaning operations and two scavenging operations to obtain copper concentrate product II and tailings. The middlings from cleaning operations I, scavenging operations I, and scavenging operations II were combined and returned to the first-stage grinding unit. Compared to the original system where middlings from cleaning operations II and III were returned sequentially, the original system resulted in concentrate I containing 23.58% copper, concentrate II containing 16.32% copper, and tailings containing 0.36% copper, with a total copper concentrate recovery rate of 89.83%. Compared to the original system, the copper recovery rate increased by 1.54 percentage points, and the copper content in the tailings decreased by 0.056 percentage points.

[0044] In summary, compared with the prior art, the present invention has the following advantages: 1. This invention addresses the unevenly distributed copper minerals in pyrometallurgical slag, and, based on the properties of the original ore and its beneficiation characteristics, steps to dissociate and collect copper minerals, producing a concentrate product.

[0045] 2. This invention performs grinding on the middlings of the fined minerals, further finely grinding the intergrowths in the fined minerals to achieve monomer liberation, thereby avoiding the mixing of impurity minerals into concentrate product II and improving the quality of concentrate product II.

[0046] 3. This invention grinds and magnetically separates the tailings product after scavenging II, realizing tailings reduction operations, removing most of the iron minerals, reducing their impact on copper mineral flotation, and providing a good premise for scavenging III operations in terms of reagent consumption and reagent selectivity, ultimately reducing the copper content in tailings II, which can effectively improve copper flotation technical indicators and is conducive to the efficient recovery and utilization of copper resources.

Claims

1. A mineral processing technology for recovering copper from copper pyrometallurgical slag, characterized in that, Includes the following steps: S1: After grinding the crushed copper pyrometallurgical slag, roughing operation I is carried out to obtain concentrate and tailings, wherein the obtained concentrate is copper concentrate product I. S2: The tailings obtained in step S1 are subjected to roughing operation II to obtain rough concentrate and tailings; S3: After the rough concentrate obtained in step S2 is processed through fine cleaning operation I, fine cleaning operation II, fine cleaning operation III, fine scavenging operation I and fine scavenging operation II, concentrate product II and tailings product I are obtained; S4: After the tailings obtained in step S2 are subjected to scavenging operation I and scavenging operation II, they are subjected to grinding operation III and magnetic separation to obtain magnetic concentrate and magnetic tailings. S5: After the magnetic separation tailings obtained in step S4 are subjected to scavenging operation III, scavenged tailings are obtained. The magnetic separation concentrate and scavenged tailings are combined into tailings product II.

2. The beneficiation process for recovering copper from copper pyrometallurgical slag according to claim 1, characterized in that, In step S3, the middlings from fine selection operation II, fine selection operation III, fine scavenging operation I, and fine scavenging operation II are returned to fine selection operation I through grinding operation II to form a cycle.

3. The beneficiation process for recovering copper from copper pyrometallurgical slag according to claim 1, characterized in that, In step S4, the concentrate produced by scavenging operation I is returned to roughing operation I in step S1, and the concentrate produced by scavenging operation II is returned to scavenging operation I in step S2.

4. The beneficiation process for recovering copper from copper pyrometallurgical slag according to claim 1, characterized in that, In step S1, the fineness of grinding operation I is -200 mesh, accounting for 70%-85%.

5. A mineral processing technology for recovering copper from copper pyrometallurgical slag according to claim 2, characterized in that, Grinding operation II produces 75%-85% of the ore with a fineness of -325 mesh.

6. The beneficiation process for recovering copper from copper pyrometallurgical slag according to claim 1, characterized in that, In step S4, the fineness of grinding operation III is -325 mesh, accounting for 80%-90%.

7. The beneficiation process for recovering copper from copper pyrometallurgical slag according to claim 1, characterized in that, In step S4, the magnetic field strength of the magnetic separation is 1800 Oe to 20000 Oe.

8. A mineral processing technology for recovering copper from copper pyrometallurgical slag according to any one of claims 1 to 7, characterized in that, Xanthate collector and pine oil foaming agent are added during the separation processes of roughing operation I, roughing operation II, scavenging operation I, scavenging operation II, fine scavenging operation I and fine scavenging operation II.

9. A mineral processing technology for recovering copper from copper pyrometallurgical slag according to claim 8, characterized in that, During the sweeping operation III separation process, xanthate collector and Z-200 foaming agent are added.

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