Smelting processing method of low-grade copper concentrate

Abstract

The invention relates to the technical field of metallurgy, and discloses a smelting processing method of low-grade copper concentrate. The smelting processing method of the low-grade copper concentrate comprises the following steps: mixing the low-grade copper concentrate with zinc concentrate to prepare ore pulp; the ore pulp is subjected to first-stage oxygen pressure leaching, and first-stage leaching liquid and first-stage leaching residues are obtained; the first-stage leaching residues are subjected to second-stage oxygen pressure leaching treatment, and second-stage leaching liquid is obtained and flows back to the first-stage oxygen pressure leaching treatment; and the first-section leachate reacts with iron powder to obtain copper deposition slag, and the copper deposition slag is subjected to copper smelting treatment to obtain a crude copper product. According to the smelting processing method of the low-grade copper concentrate, the two-stage oxygen pressure leaching process is adopted, it is guaranteed that the copper element is fully leached, the two-stage total leaching rate can reach 95% or above, the copper content in the obtained crude copper product can also reach 95 wt% or above, waste of copper resources is reduced, the recovery process is high in efficiency and good in stability, the obtained crude copper product is high in purity, and the method is suitable for industrial production. The industrial application requirements can be met.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, and in particular to a smelting and processing method for low-grade copper concentrate. Background Art

[0002] Low-grade copper concentrate refers to an ore containing less copper, and its copper content is usually lower than the standard for industrial mining. After further refining, the crude copper products obtained from the crude smelting of low-grade copper concentrate can be widely used in many fields. For example, as the main raw material for the manufacture of various copper alloys such as brass, bronze, and nickel silver, the obtained copper alloys have excellent physical and chemical properties, good ductility, wear resistance and corrosion resistance, and can be widely used in machinery manufacturing, building decoration, electronics and electrical industries; as a raw material for cables and wires, it has good electrical conductivity and plays an important role in the fields of power transmission and communication; as a catalyst in the chemical industry, it participates in certain chemical reaction processes to improve production efficiency and product quality; in addition, in the field of automobile manufacturing, crude copper can also be used to produce various parts such as radiators and brake systems to provide guarantees for the safety and reliability of automobiles. It can be seen that after refining and processing, crude copper products can not only meet the needs of industrial production, but also play an important role in daily life and provide strong support for scientific and technological progress. Therefore, it is of great significance to efficiently recover crude copper products from low-grade copper concentrate.

[0003] At present, the main method for recovering crude copper from low-grade copper concentrate is pyrometallurgy. However, due to the low copper content in low-grade copper concentrate, the processing process has high energy consumption, low efficiency and high cost. In addition, in the processing of low-grade copper concentrate, the grade of the charge is easily depleted, which not only occupies the processing channel, but also affects the recovery rate of copper.

[0004] In order to improve the treatment effect of low-grade copper concentrate, the key links such as crushing, grinding, grading and sorting are currently optimized in the field of mineral processing to improve the grade and recovery rate of the concentrate. At the same time, attempts are made to apply cutting-edge technologies such as biometallurgy and ionic liquid extraction to the treatment of high-grade copper concentrate. These innovative technologies are not only expected to significantly improve the recovery rate, but also play a positive role in cost control, injecting new vitality and hope into the mining and metallurgical industries. However, due to the long reaction cycle, high reagent cost, and the results are still in the laboratory research stage, these technologies have not yet been industrialized. Therefore, there is still a lack of methods for recovering crude copper from low-grade copper concentrates with low cost, high efficiency, high crude copper recovery rate, simple process, and easy industrialization. Summary of the invention

[0005] The present invention aims to solve at least one of the above-mentioned technical problems existing in the prior art. To this end, the object of the present invention is to provide a smelting and processing method for low-grade copper concentrate.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] The present invention provides a smelting method for low-grade copper concentrate, comprising the following steps:

[0008] A low-grade copper concentrate and a zinc concentrate are mixed to form a pulp; the pulp is subjected to a first-stage oxygen pressure leaching to obtain a first-stage leaching solution and a first-stage leaching slag; the first-stage leaching slag is subjected to a second-stage oxygen pressure leaching to obtain a second-stage leaching solution and refluxed to the first-stage oxygen pressure leaching; the first-stage leaching solution reacts with iron powder to obtain copper precipitation slag, and the copper precipitation slag is subjected to copper smelting to obtain a crude copper product.

[0009] Preferably, the grade of the low-grade copper concentrate is less than 50%; further preferably, the grade of the low-grade copper concentrate is less than 10%.

[0010] Preferably, the low-grade copper concentrate comprises the following components by mass percentage: 39.0-55.0% Zn, 0.01-15.0% Pb, 24.0-45.0% S, and 0.3-6.0% Cu.

[0011] Preferably, the mass of the low-grade copper concentrate is 1-30% of the total mass of the low-grade copper concentrate and the zinc concentrate; further preferably, the mass of the low-grade copper concentrate is 10-30% of the total mass of the low-grade copper concentrate and the zinc concentrate.

[0012] Preferably, the mineral particles with a particle size of less than 40 μm in the slurry account for more than 90 wt% of the total amount of the mineral.

[0013] Preferably, the slurry is obtained by ball milling the low-grade copper concentrate and the zinc concentrate.

[0014] Preferably, the ball milling process includes adding water.

[0015] Preferably, the process parameters of the first stage oxygen pressure leaching include at least one of the following parameters:

[0016] 1) The pressure is 0.1-0.6MPa;

[0017] 2) Temperature is 90-130°C;

[0018] 3) Oxygen partial pressure is 0.2-0.8MPa;

[0019] 4) The time is 1-5h.

[0020] Further preferably, the process parameters of the first stage oxygen pressure leaching include at least one of the following parameters:

[0021] 1) The pressure is 0.2-0.5MPa;

[0022] 2) Temperature is 100-120°C;

[0023] 3) Oxygen partial pressure is 0.3-0.6MPa;

[0024] 4) The time is 1-3h.

[0025] Preferably, the operation of adding a primary acid is further included before the first stage of oxygen pressure leaching.

[0026] Preferably, the concentration of the first-stage initial acid is 70-110 g / L; further preferably, the concentration of the first-stage initial acid is 80-100 g / L.

[0027] Preferably, the first stage initial acid is added in the form of sulfuric acid and / or the second stage leaching solution.

[0028] Preferably, the final acid concentration of the first-stage leachate is 15-40 g / L; further preferably, the final acid concentration of the first-stage leachate is 18-35 g / L.

[0029] Preferably, the one-stage oxygen pressure leaching comprises adding a first dispersant.

[0030] Preferably, the first dispersant is added in an amount of 0.5-1.5 kg / t of slurry; further preferably, the first dispersant is added in an amount of 0.7-1.2 kg / t of slurry.

[0031] Preferably, in the one-stage oxygen pressure leaching, the solid-liquid ratio of the solid material to the liquid material is 1 g:(6-10) mL; further preferably, the solid-liquid ratio of the solid material to the liquid material is 1 g:(7-9) mL.

[0032] Preferably, the process parameters of the second-stage oxygen pressure leaching include at least one of the following parameters:

[0033] 1) The pressure is 1.0-1.7MPa;

[0034] 2) Temperature is 130-170°C;

[0035] 3) Oxygen partial pressure is 1.0-1.8MPa;

[0036] 4) The time is 1-5h.

[0037] Further preferably, the process parameters of the second-stage oxygen pressure leaching include at least one of the following parameters:

[0038] 1) The pressure is 1.2-1.5MPa;

[0039] 2) Temperature is 140-160°C;

[0040] 3) Oxygen partial pressure is 1.3-1.6MPa;

[0041] 4) The time is 1-3h.

[0042] Preferably, the second stage oxygen pressure leaching further includes an operation of adding second stage initial acid.

[0043] Preferably, the concentration of the second-stage initial acid is 150-200 g / L; further preferably, the concentration of the second-stage initial acid is 160-200 g / L.

[0044] Preferably, the second-stage initial acid is added in the form of sulfuric acid and / or zinc electrowinning waste liquid.

[0045] Preferably, the final acid concentration of the second-stage leaching solution is 70-110 g / L; further preferably, the final acid concentration of the second-stage leaching solution is 80-100 g / L.

[0046] Preferably, the second stage oxygen pressure leaching includes adding a second dispersant.

[0047] Preferably, the amount of the second dispersant added is 2-5 kg / t of slurry; further preferably, the amount of the second dispersant added is 3-4.5 kg / t of slurry.

[0048] Preferably, the first dispersant and the second dispersant may be the same dispersant or different dispersants.

[0049] Preferably, in the second-stage oxygen pressure leaching, the solid-liquid ratio of the solid material to the liquid material is 1 g:(3-7) mL; further preferably, the solid-liquid ratio of the solid material to the liquid material is 1 g:(3-5) mL.

[0050] Preferably, the mass amount of the iron powder is 1-5 times the copper ion content in the first stage leaching solution.

[0051] Preferably, the temperature at which the first-stage leaching solution reacts with the iron powder is 60-100°C; further preferably, the temperature at which the first-stage leaching solution reacts with the iron powder is 70-90°C.

[0052] Preferably, the time for the reaction of the first stage of the leachate with the iron powder is 10-100 min; further preferably, the time for the reaction of the first stage of the leachate with the iron powder is 15-90 min.

[0053] Preferably, the reaction of the first-stage leaching solution with the iron powder comprises adding a neutralizing agent to adjust the acid concentration of the reaction system to 4-10 g / L.

[0054] Preferably, the neutralizing agent includes at least one of zinc oxide, sodium hydroxide, calcium hydroxide and zinc powder.

[0055] Preferably, the copper smelting process includes copper converter treatment and slag smelting furnace treatment.

[0056] Further preferably, when the copper content in the copper precipitate slag is ≥40%, copper converter treatment is performed; when the copper content in the copper precipitate slag is <40%, slag smelting furnace treatment is first performed, and then copper converter treatment is performed.

[0057] Preferably, the process parameters of the copper converter treatment include at least one of the following parameters:

[0058] 1) adding an auxiliary agent to the copper precipitation slag, wherein the auxiliary agent comprises at least one of 2-10wt% sodium carbonate (soda ash), 0.5-5wt% lime, 4-15wt% quartz sand, and 0.5-5wt% sodium hydroxide (caustic soda);

[0059] 2) Temperature is 1000-1500°C;

[0060] 3) The time is 5-15h.

[0061] Further preferably, the process parameters of the copper converter treatment include at least one of the following parameters:

[0062] 1) adding an auxiliary agent to the copper precipitation slag, wherein the auxiliary agent comprises at least one of 4-10wt% sodium carbonate, 0.5-4wt% lime, 4-14wt% quartz sand, and 1-4wt% sodium hydroxide;

[0063] 2) Temperature is 1000-1300°C;

[0064] 3) The time is 6-12 hours.

[0065] Preferably, the process parameters of the slag smelting furnace treatment include at least one of the following parameters:

[0066] 1) adding an auxiliary agent to the copper precipitation slag, wherein the auxiliary agent comprises at least one of 2-10wt% soda, 1-10wt% iron filings, and 1-7wt% coke;

[0067] 2) Temperature is 1000-1500°C;

[0068] 3) The time is 4-12 hours.

[0069] Further preferably, the process parameters of the slag smelting furnace treatment include at least one of the following parameters:

[0070] 1) adding an auxiliary agent to the copper precipitate slag, wherein the auxiliary agent comprises at least one of 3-8wt% soda, 1.5-8wt% iron filings, and 1-5wt% coke;

[0071] 2) Temperature is 1000-1300°C;

[0072] 3) The time is 4-10 hours.

[0073] Preferably, before the copper precipitation slag is subjected to copper smelting treatment, a step of drying for 3-5 hours at a hot air temperature of 300-500° C. and a tail gas temperature of 100-120° C. is included to reduce the water content.

[0074] The basic principle of the present invention is described as follows:

[0075] 1) The smelting and processing method of the low-grade copper concentrate provided by the present invention adopts two-stage oxygen pressure leaching in the leaching stage, and ensures that the copper element in the low-grade copper concentrate is fully leached by controlling the reaction conditions (including acidity, pressure, oxygen partial pressure, temperature and reaction time) of the two stages;

[0076] 2) In the copper ion reduction stage, the pH of the copper ion leaching solution is adjusted, and an appropriate amount of iron powder is added based on the copper ion content, and the reaction time and temperature are controlled to reduce the copper ions to metallic copper using the iron powder as a reducing agent to form copper precipitate slag;

[0077] 3) During the smelting stage, advanced slag smelting furnaces or copper converter technologies are introduced to treat copper slag, shortening the smelting time and improving the purity of crude copper products.

[0078] Preferably, the smelting and processing method of the low-grade copper concentrate specifically comprises the following steps:

[0079] S1. Mix low-grade copper concentrate and zinc concentrate and grind them into slurry;

[0080] S2, adding a first dispersant and a first acid to the ore pulp, and subjecting the ore pulp to a first oxygen pressure leaching to obtain a first slurry; subjecting the first slurry to flocculation and concentration, and solid-liquid separation, to obtain a first leachate and a first leaching residue;

[0081] S3, after grinding the first stage leaching residue, adding the second dispersant and the second stage initial acid, and subjecting the second stage oxygen pressure leaching to obtain the second stage slurry; the second stage slurry is subjected to flocculation and concentration, and solid-liquid separation to obtain the second stage leaching liquid and the second stage leaching residue; the second stage leaching liquid is refluxed as the initial acid for the first stage oxygen pressure leaching; the second stage leaching residue enters the sulfur recovery system;

[0082] S4, adding a neutralizing agent and iron powder to the first stage leaching solution to react and obtain copper precipitate slag; the copper precipitate slag is dried and subjected to copper smelting treatment to obtain a crude copper product.

[0083] Compared with the prior art, the present invention has the following beneficial effects:

[0084] 1) The smelting and processing method of low-grade copper concentrate provided by the present invention adopts a two-stage oxygen pressure leaching process to ensure that the copper element is fully leached, and the total leaching rate of the two stages can reach more than 95%. The copper content in the obtained crude copper product can also reach more than 95%, which reduces the waste of copper resources, and the recovery process is efficient and stable;

[0085] 2) The smelting and processing method of low-grade copper concentrate provided by the present invention adopts slag smelting furnace or copper converter technology in the smelting stage, which has short smelting time and high efficiency, and the obtained crude copper product has high purity and can meet the needs of industrial application;

[0086] 3) The smelting and processing method of low-grade copper concentrate provided by the present invention has simple steps, short time consumption, fast conversion speed of low-grade copper concentrate to high-quality crude copper, low process cost, and is conducive to promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0087] Figure 1 The figure is a schematic flow chart of the smelting and processing method of low-grade copper concentrate of the present invention;

[0088] Figure 2 It is a schematic flow chart of the smelting and processing method of low-grade copper concentrate in the embodiment. DETAILED DESCRIPTION

[0089] The present invention is further described in detail below by specific examples. The raw materials, reagents or devices used in the examples can be obtained from conventional commercial sources or by prior art methods unless otherwise specified. Unless otherwise specified, the experiments or test methods are conventional methods in the art.

[0090] Figure 1 The figure is a schematic flow chart of the smelting process of the low-grade copper concentrate of the present invention. Figure 2 The schematic diagram of the smelting process of the low-grade copper concentrate in the embodiment is as follows. Figure 1 and Figure 2 The process of smelting and processing low-grade copper concentrate to recover crude copper is described as follows:

[0091] Example 1

[0092] This embodiment provides a smelting and processing method for low-grade copper concentrate. The grade of the low-grade copper concentrate is less than 10%. By mass percentage, the low-grade copper concentrate contains 48.59% Zn, 0.02% Pb, 32.03% S, and 3.42% Cu. The steps of the smelting and processing method are as follows:

[0093] S11, mixing 20g of low-grade copper concentrate and 80g of zinc sulfide concentrate, adding water and ball milling to obtain slurry, wherein the ore particles with a particle size of less than 40μm account for more than 90wt% of the total amount of the minerals;

[0094] S21, adding the ore pulp to the autoclave, and adding 0.15g of dispersant and the second-stage leaching solution (acid concentration 90g / L), controlling the liquid-to-solid ratio of the material in the reactor to 8:1, introducing oxygen, controlling the reactor to 0.3MPa, the temperature to 112°C, and the oxygen partial pressure to 0.4MPa, performing a first-stage oxygen pressure leaching, reacting for 2h, obtaining a first-stage slurry, and flocculating and concentrating the first-stage slurry, and separating the solid and liquid to obtain a first-stage leaching solution and a first-stage leaching residue;

[0095] S31, the first stage leaching residue is ground and sent to the second stage autoclave, zinc electrodeposition waste liquid (acid concentration 180g / L) and 0.35g dispersant are added, the liquid-to-solid ratio of the materials in the reactor is controlled to be 4:1, oxygen is introduced, the reactor is controlled to be 1.3MPa, the temperature is 150°C, and the oxygen partial pressure is 1.4MPa, and the second stage oxygen pressure leaching is carried out, and the reaction is carried out for 2.5h to obtain the second stage slurry, and the second stage slurry is flocculated and concentrated, and solid-liquid separation is carried out to obtain the second stage leaching liquid (acid concentration 90g / L) and the second stage leaching residue, and the second stage leaching residue enters the sulfur recovery system, and the acid concentration of the second stage leaching liquid is 90g / L, which can be refluxed as the initial acid for the first stage oxygen pressure leaching;

[0096] S41, the acid concentration of the first leaching solution is 25g / L, containing Cu 700mg / L, Zn 165g / L, H 2 SO 4 25g / L, a neutralizing agent is added to the first leaching solution to adjust the acid concentration to 7g / L, 1.575g of iron powder is added at a ratio of 3 times the copper content, and the reaction is carried out at 80°C for 60min. The copper precipitate slag is obtained by filter pressing, and the copper precipitate slag is dried for 4h under the conditions of hot air temperature of 400°C and tail gas temperature of 110°C to reduce the water content; 150g of the dried copper precipitate slag is taken, 5.23g of soda ash, 1.96g of lime, and 6.54g of quartz are added to mix, and the copper converter treatment is carried out, and the reaction is carried out at a temperature of 1250°C for 6h to obtain a crude copper product.

[0097] Example 2

[0098] This embodiment provides a smelting and processing method for low-grade copper concentrate. The grade of the low-grade copper concentrate is less than 10%. By mass percentage, the low-grade copper concentrate contains 42.37% Zn, 0.02% Pb, 32.03% S, and 8.59% Cu. The steps of the smelting and processing method are as follows:

[0099] S11, mixing 10g of low-grade copper concentrate with 90g of zinc sulfide concentrate, adding water and ball milling to obtain slurry, wherein the ore particles with a particle size of less than 40μm account for more than 90wt% of the total amount of the minerals;

[0100] S21, adding the ore pulp to the autoclave, and adding 0.15g of dispersant and the second-stage leaching solution (acid concentration 90g / L), controlling the liquid-to-solid ratio of the material in the reactor to 8:1, introducing oxygen, controlling the reactor to 0.3MPa, the temperature to 112°C, and the oxygen partial pressure to 0.4MPa, performing a first-stage oxygen pressure leaching, reacting for 2h, obtaining a first-stage slurry, and flocculating and concentrating the first-stage slurry, and separating the solid and liquid to obtain a first-stage leaching solution and a first-stage leaching residue;

[0101] S31, the first stage leaching residue is ground and sent to the second stage autoclave, zinc electrodeposition waste liquid (acid concentration 180g / L) and 0.35g dispersant are added, the liquid-to-solid ratio of the materials in the reactor is controlled to be 4:1, oxygen is introduced, the reactor is controlled to be 1.3MPa, the temperature is 150°C, and the oxygen partial pressure is 1.4MPa, and the second stage oxygen pressure leaching is carried out, and the reaction is carried out for 2.5h to obtain the second stage slurry, and the second stage slurry is flocculated and concentrated, and solid-liquid separation is carried out to obtain the second stage leaching liquid (acid concentration 90g / L) and the second stage leaching residue, and the second stage leaching residue enters the sulfur recovery system, and the acid concentration of the second stage leaching liquid is 90g / L, which can be refluxed as the initial acid for the first stage oxygen pressure leaching;

[0102] S41, the acid concentration of the first leaching solution is 25g / L, containing Cu 1079mg / L, Zn 167g / L, H 2 SO 4 25g / L, a neutralizing agent is added to the first leaching solution to adjust the acid concentration to 7g / L, 2.460g of iron powder is added at a ratio of 3 times the copper content, and the reaction is carried out at 80°C for 60min. The copper precipitate slag is obtained by filter pressing, and the copper precipitate slag is dried for 4h under the conditions of hot air temperature of 400°C and tail gas temperature of 110°C to reduce the water content; 150g of the dried copper precipitate slag is taken, 5.44g of soda ash, 2.04g of lime, and 6.80g of quartz are added and mixed, and the copper converter treatment is carried out, and the reaction is carried out at a temperature of 1250°C for 6h to obtain a crude copper product.

[0103] Table 1 shows the zinc and copper contents in the ore pulp, the first-stage leaching slag and the second-stage leaching slag in Examples 1 and 2, and Table 2 shows the material composition in the copper precipitation slag and the crude copper product in Examples 1 and 2.

[0104] Table 1 Zinc and copper contents in slurry, primary leaching slag and secondary leaching slag in Examples 1 and 2

[0105]

[0106] Table 2 Composition of substances in copper slag and crude copper products in Examples 1 and 2

[0107]

[0108]

[0109] The total leaching rate of copper element in the two-stage oxygen pressure leaching in Example 1 is 95.5%, and the total leaching rate of zinc element is 95.61%. The total leaching rate of copper element in the two-stage oxygen pressure leaching in Example 2 is 95.3%, and the total leaching rate of zinc element is 95.51% (calculated as follows: total leaching rate of copper / zinc element=1-(grade of copper or zinc in the first-stage leaching slag*dry weight of leaching slag) / (grade of copper or zinc in the low-grade copper concentrate*total dry weight of the low-grade copper concentrate and the zinc concentrate)*100%). It can be seen from Table 1 and Table 2 that after iron powder reduction, the copper content in the copper precipitate slag in Examples 1 and 2 is greater than 40wt%, and after smelting in a copper converter, the copper content in the crude copper product obtained in Example 1 reaches 95.59wt%, and the copper content in the crude copper product obtained in Example 2 reaches 96.34wt%; that is, by adopting the smelting and processing method of low-grade copper concentrate provided by the present invention, the obtained crude copper product has high copper content and high purity, and the smelting treatment time is short and the efficiency is high.

[0110] The smelting and processing method of low-grade copper concentrate provided by the present invention has simple steps, high efficiency and short time consumption, and can quickly and stably convert low-grade copper concentrate into high-purity, high-quality crude copper. The obtained crude copper product can be used for the preparation of copper alloys, as a raw material for wires and cables, or for the manufacture of automobile parts after refining, so as to meet the needs of industrial production, reduce the waste of copper resources, and have good social, economic and environmental benefits.

Claims

1. A smelting and processing method for low-grade copper concentrate, characterized in that: The following steps are involved: A low-grade copper concentrate and a zinc concentrate are mixed to form a pulp; the pulp is subjected to a first-stage oxygen pressure leaching to obtain a first-stage leaching solution and a first-stage leaching slag; the first-stage leaching slag is subjected to a second-stage oxygen pressure leaching to obtain a second-stage leaching solution and refluxed to the first-stage oxygen pressure leaching; the first-stage leaching solution reacts with iron powder to obtain copper precipitation slag, and the copper precipitation slag is subjected to copper smelting to obtain a crude copper product.

2. The smelting and processing method of low-grade copper concentrate according to claim 1, characterized in that: The mass of the low-grade copper concentrate is 1-30% of the total mass of the low-grade copper concentrate and the zinc concentrate; And / or, the mineral particles with a particle size of less than 40 μm in the slurry account for more than 90 wt% of the total amount of the minerals.

3. The smelting and processing method of low-grade copper concentrate according to claim 1 or 2, characterized in that: The process parameters of the first stage oxygen pressure leaching include at least one of the following parameters: 1) The pressure is 0.1-0.6MPa; 2) Temperature is 90-130°C; 3) Oxygen partial pressure is 0.2-0.8MPa; 4) The time is 1-5h.

4. The smelting and processing method of low-grade copper concentrate according to claim 3, characterized in that: The operation of adding a first stage of initial acid before the first stage of oxygen pressure leaching is also included; Preferably, the concentration of the initial acid is 70-110 g / L; Preferably, the first stage initial acid is added in the form of sulfuric acid and / or the second stage leaching solution.

5. The smelting and processing method of low-grade copper concentrate according to claim 3, characterized in that: The final acid concentration of the first-stage leaching solution is 15-40 g / L.

6. The smelting and processing method of low-grade copper concentrate according to claim 1, characterized in that: The process parameters of the second stage oxygen pressure leaching include at least one of the following parameters: 1) The pressure is 1.0-1.7MPa; 2) Temperature is 130-170°C; 3) Oxygen partial pressure is 1.0-1.8MPa; 4) The time is 1-5h.

7. The smelting and processing method of low-grade copper concentrate according to claim 6, characterized in that: The second stage oxygen pressure leaching also includes the operation of adding the second stage initial acid; Preferably, the concentration of the second-stage initial acid is 160-200 g / L; Preferably, the second-stage initial acid is added in the form of sulfuric acid and / or zinc electrowinning waste liquid.

8. The smelting and processing method of low-grade copper concentrate according to claim 6, characterized in that: The final acid concentration of the second-stage leaching solution is 70-110 g / L.

9. The smelting and processing method of low-grade copper concentrate according to claim 1, characterized in that: The mass amount of the iron powder is 1-5 times the copper ion content in the first stage of the leaching solution; And / or, the reaction temperature is 60-100° C. and the reaction time is 10-100 min.

10. The smelting and processing method of low-grade copper concentrate according to claim 1, characterized in that: The copper smelting process includes copper converter treatment and slag smelting furnace treatment.

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