A method for autothermal synergistic smelting to recover copper and deplete matte converting slag

Abstract

The present application provides a method for autothermal co-smelting to recover copper and deplete matte converting slag, relating to the field of metal recovery. The method comprises: directly discharging liquid matte converting slag produced during a copper smelting process into a hot co-smelting furnace, adding coarsely crushed and mixed multi-source copper-based solid waste, and co-smelting under oxygen-enriched air conditions. The co-smelting process comprises a melting period, a depletion period, and a rest period. During the melting period, copper, aluminum, iron, lead, and tin in the copper-based solid waste are rapidly melted to form a first blister copper. During the depletion period, aluminum and iron in the first blister copper and organic matter in the copper-based solid waste act as reducing agents to reduce copper, nickel, cobalt, zinc, and lead oxides in the matte converting slag to a metallic state, which then enters the first blister copper to form a second blister copper. The iron and aluminum are oxidized and enter the matte converting slag to form a second slag. During the rest period, a reducing agent is added and air blowing is terminated. After resting, a third blister copper and a third slag are formed, which are then collected to obtain a blister copper product.

Description

Technical Field

[0001] The present application relates to the field of metal recovery, and in particular to a method for recovering copper by autothermal synergistic smelting and depleting matte converting slag. Background Art

[0002] Copper-based waste is rich in valuable metals such as copper, tin, gold, and silver. Currently, it is recovered by full wet leaching or pyrometallurgical smelting, with pyrometallurgical smelting being the most widely used method.

[0003] Current pyrometallurgical recycling processes have high requirements for copper-based waste materials, often requiring the addition of slagging agents such as lime and hematite. Meanwhile, matte converting slag is primarily depleted through reduction or beneficiation, with reduction being the primary method. The reduction depletion process requires the simultaneous addition of reducing agents, sulfiding agents, and slagging agents to achieve optimal results, ultimately yielding matte. Direct reduction depletion of matte converting slag results in large slag volumes and low matte volumes, making slag-matte separation difficult. Summary of the Invention

[0004] The purpose of this application is to provide a method for autothermal co-smelting to recover copper and deplete matte converting slag to solve the above problems.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] The present application provides a method for autothermal co-smelting to recover copper and deplete matte converting slag, comprising:

[0007] The liquid matte converting slag produced during the copper smelting process is directly discharged into a hot co-smelting furnace, and co-smelting is carried out under oxygen-enriched air conditions by adding co-smelting waste from multiple sources that have been co-crushed and mixed. The co-smelting includes a melting period, a depletion period, and a rest period.

[0008] During the melting period, copper, aluminum, iron, lead and tin in the copper-based solid waste are rapidly melted to form first blister copper;

[0009] During the depletion period, the aluminum and iron in the first blister copper and the organic matter in the copper-based solid waste act as reducing agents to reduce the copper, nickel, cobalt, zinc, and lead oxides in the matte converting slag into metallic state and enter the first blister copper to form the second blister copper, and the iron and aluminum are oxidized and enter the matte converting slag to form the second slag;

[0010] During the standing period, a reducing agent is added and the blowing is terminated, and after standing, a third blister copper and a third slag are formed, which are discharged from the copper outlet and the slag outlet respectively, and the blister copper product is collected;

[0011] The first blister copper comprises copper, aluminum, iron, lead, and tin;

[0012] The second blister copper comprises copper, lead, tin, nickel, cobalt and zinc;

[0013] The third blister copper includes copper, lead, tin, nickel, cobalt and zinc.

[0014] Optionally, the multi-source copper-based solid waste contains 10-30 wt% copper, and the matte converting slag contains 0.8-5 wt% copper, 45-60 wt% iron, and 25-35 wt% silicon dioxide.

[0015] The multi-source copper-based solid waste includes slag-forming metals, and the slag-forming metals include iron and aluminum; the content of the slag-forming metals is 5-20wt% of the multi-source copper-based solid waste;

[0016] The calorific value of the multi-source copper-based solid waste is 1.5-1.7 MJ / kg.

[0017] Optionally, the temperature of the co-smelting is 1250-1350°C.

[0018] Preferably, the temperature of the co-smelting is 1250-1300°C.

[0019] Optionally, the matte converting slag is 60-500wt% of multi-source copper-based solid waste.

[0020] Preferably, the matte converting slag is 100-300% of multi-source copper-based solid waste.

[0021] Optionally, the concentration of oxygen in the oxygen-enriched air is 25-40%.

[0022] Optionally, during the co-smelting depletion period, not less than 80 wt% of the copper in the converting slag is reduced into the first blister copper to form the second blister copper, and not less than 99 wt% of the iron and aluminum in the multi-source copper-based solid waste are oxidized and enter the matte converting slag to form the second slag.

[0023] Optionally, the reducing agent includes waste resin, coke, coal, and charcoal, and the added amount is 0.1-2 wt % of the total amount of the multi-source copper-based solid waste and the matte converting slag.

[0024] Compared with the prior art, the advantages of this application include:

[0025] The present application combines the co-smelting of copper-based solid waste with the depletion of matte slag, which not only solves the problems of difficult slag-making and low copper recovery rate in the co-smelting of copper-based solid waste, but also solves the difficult problem of less reduced depleted metal phase and difficult slag-matte separation in matte slag. By modifying and reducing the matte converting slag, valuable metals such as copper in the converting slag are incorporated into the crude copper, and iron, aluminum, etc. in the copper-based waste are incorporated into the smelting slag to form slag, ultimately achieving efficient recovery of valuable metals such as copper. No slag-making agent or sulfiding agent is required in the process, and 100% autothermal smelting is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope of the present application.

[0027] Figure 1 This is a schematic diagram of the process flow of the method for autothermal coordinated smelting to recover copper and deplete matte converting slag adopted in the embodiment. DETAILED DESCRIPTION

[0028] As used herein:

[0029] "Prepared from" is synonymous with "comprising." As used herein, the terms "comprising," "including," "having," "containing," or any other variations thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0030] The conjunction "consisting of" excludes any unspecified element, step, or component. If used in a claim, this phrase renders the claim closed, excluding materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of" appears in a clause of the body of a claim, rather than immediately following the subject matter, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0031] When an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper preferred values and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed alone. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including the range "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described herein, unless otherwise stated, the range is intended to include its end values and all integers and fractions within the range.

[0032] In these examples, parts and percentages are by mass unless otherwise indicated.

[0033] "Parts by mass" refers to the basic unit of measurement used to express the mass ratio of multiple components. One part can represent any unit of mass, such as 1g or 2.689g. For example, if we say that the parts by mass of component A are a parts and the parts by mass of component B are b parts, this means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, we could say that the mass of component A is aK and the mass of component B is bK (K is an arbitrary number representing a multiplication factor). It's important to note that, unlike parts by mass, the sum of the parts by mass of all components is not limited to 100 parts.

[0034] "And / or" is used to indicate that one or both of the stated situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0035] In order to better illustrate the technical solution provided by this application, the technical solution will be described as a whole before the specific embodiments are described.

[0036] The present application provides a method for autothermal synergistic smelting to recover copper and deplete matte converting slag, comprising:

[0037] The liquid matte converting slag produced during the copper smelting process is directly discharged into a hot co-smelting furnace, and co-smelting is carried out under oxygen-enriched air conditions by adding co-smelting waste from multiple sources that have been co-crushed and mixed. The co-smelting includes a melting period, a depletion period, and a rest period.

[0038] During the melting period, copper, aluminum, iron, lead and tin in the copper-based solid waste are rapidly melted to form first blister copper;

[0039] During the depletion period, the aluminum and iron in the first blister copper and the organic matter in the copper-based solid waste act as reducing agents to reduce the copper, nickel, cobalt, zinc, and lead oxides in the matte converting slag into metallic state and enter the first blister copper to form the second blister copper, and the iron and aluminum are oxidized and enter the matte converting slag to form the second slag;

[0040] During the standing period, a reducing agent is added and the blowing is terminated, and after standing, a third blister copper and a third slag are formed, which are discharged from the copper outlet and the slag outlet respectively, and the blister copper product is collected;

[0041] The first blister copper comprises copper, aluminum, iron, lead, and tin;

[0042] The second blister copper comprises copper, lead, tin, nickel, cobalt and zinc;

[0043] The third blister copper includes copper, lead, tin, nickel, cobalt and zinc.

[0044] It can be understood that the present application synergistically smelts multi-source copper-based solid wastes such as waste circuit boards, waste resin powder, and low-grade scrap copper with matte converting slag to obtain blister copper containing more than 90wt% copper, in which precious metals such as gold and silver are enriched; the organic matter in the waste circuit boards and waste resin powder serves as fuel to provide the heat required for autothermal smelting; the iron, aluminum and some organic matter in the copper-based solid waste serve as reducing agents to reduce valuable metal oxides such as copper, lead, zinc, nickel, and cobalt in the matte converting slag into the blister copper; the silicon in the copper-based solid waste serves as a flux to improve the slag properties during the reduction and depletion process of the matte converting slag; and oxygen-enriched air is used to assist in smelting to control the smelting temperature. This method overcomes the problems of poor adaptability of raw materials for pyrometallurgical recovery of copper-based waste, difficulty in slag making, and low recovery rate of valuable metals. By adopting a self-heating synergistic method, the smelting heat is 100% provided by the copper-based waste. At the same time, it solves the difficult problems of external heat supply for reduction and depletion of matte converting slag and difficulty in slag-matte separation, and significantly reduces the use of sulfiding agents and slag-forming agents, thereby achieving effective depletion of matte converting slag.

[0045] In an optional embodiment, the multi-source copper-based solid waste contains 10-30wt% copper, 5-20wt% iron and aluminum; the matte converting slag contains 0.8-5wt% copper, 45-60wt% iron, and 25-35wt% silicon dioxide.

[0046] Optionally, the copper content in the multi-source copper-based solid waste may be 10wt%, 11wt%, 12wt%, 13wt%, 14wt%, 15wt%, 16wt%, 17wt%, 18wt%, 19wt%, 20wt%, 21wt%, 22wt%, 23wt%, 24wt%, 25wt%, 26wt%, 27wt%, 28wt%, 29wt%, 30wt%, or any value between 10-30wt%. Optionally, the content of the slag-forming metal may be 10wt%, 11wt%, 12wt%, 13wt%, 14wt%, 15wt% of the multi-source copper-based solid waste, or any value between 10-15wt%.

[0047] In an optional embodiment, the co-smelting temperature is 1250-1350° C. and the time is 60-120 min.

[0048] Optionally, the co-smelting temperature may be 1250° C., 1260° C., 1270° C., 1280° C., 1290° C., 1300° C., 1310° C., 1320° C., 1330° C., 1340° C., 1350° C., or any value between 1200° C. and 1300° C. Preferably, the co-smelting temperature is 1250-1300° C., and the time is 60-100 min.

[0049] In an optional embodiment, the calorific value of the multi-source copper-based solid waste is 1.5-1.7 MJ / kg.

[0050] Optionally, the calorific value of the multi-component copper-based solid waste can be 1.5MJ / kg, 1.51MJ / kg, 1.52MJ / kg, 1.53MJ / kg, 1.54MJ / kg, 1.55MJ / kg, 1.56MJ / kg, 1.57MJ / kg, 1.58MJ / kg, 1.59MJ / kg, 1.6MJ / kg, 1.61MJ / kg, 1.62MJ / kg, 1.63MJ / kg, 1.64MJ / kg, 1.65MJ / kg, 1.66MJ / kg, 1.67MJ / kg, 1.68MJ / kg, 1.69MJ / kg, 1.7MJ / kg, or any value between 1.5-1.7MJ / kg.

[0051] In an optional embodiment, the matte converting slag is 60-500 wt % of the multi-source copper-based solid waste.

[0052] Optionally, the matte converting slag may be 60wt%, 100wt%, 150wt%, 200wt%, 250wt%, 300wt%, 350wt%, 400wt%, 450wt%, or 500wt% of the multi-source copper-based solid waste, or any value between 60-500wt% of the multi-source copper-based solid waste. Preferably, the matte converting slag is 100-300wt% of the multi-source copper-based solid waste.

[0053] In an optional embodiment, the concentration of oxygen in the oxygen-enriched air is 25-40%.

[0054] Optionally, the oxygen concentration in the oxygen-enriched air can be 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, or any value between 25-40%.

[0055] During the co-smelting and depletion period, under the disturbance of oxygen-rich air, the metallic iron and aluminum in the first blister copper and some organic matter in the copper-based solid waste are fully contacted with the matte converting slag, and the oxides of copper, lead, zinc, nickel, cobalt and the like in the slag are reduced to metals and enter the blister copper to form the second blister copper, and the iron and aluminum are oxidized to oxides and enter the slag to form the second slag.

[0056] In an optional embodiment, not less than 80 wt % of the copper in the converting slag enters the first blister copper to form the second blister copper, and less than 99 wt % of the iron and aluminum in the multi-source copper-based solid waste enters the matte converting slag to form the second slag.

[0057] In an optional embodiment, the reducing agent powder includes waste resin powder, coke, coal powder, and charcoal, and the added amount is 0.1-2wt% of the total amount of the multi-source copper-based solid waste and the matte converting slag.

[0058] Optionally, the amount of the reducing agent added can be 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt%, 0.7wt%, 0.8wt%, 0.9wt%, 1wt%, 1.1wt%, 1.2wt%, 1.3wt%, 1.4wt%, 1.5wt%, 1.6wt%, 1.7wt%, 1.8wt%, 1.9wt%, 2wt% of the total amount of the matte blowing slag, or any value between 0.1-2wt%.

[0059] The embodiments of the present application will be described in detail below in conjunction with specific examples, but it will be understood by those skilled in the art that the following examples are merely illustrative of the present application and should not be considered as limiting the scope of the present application. In the examples, if specific conditions are not specified, the conditions are carried out according to conventional conditions or manufacturer recommendations. The reagents or instruments used are not specified by the manufacturer and are conventional products that can be purchased commercially.

[0060] Example 1

[0061] This embodiment provides a method for recovering copper through autothermal synergistic smelting and enriching matte converting slag. The process is as follows: Figure 1 The specific process is as follows:

[0062] 900 kg of multi-source copper-based solid waste and 900 kg of hot matte converting slag were coarsely crushed and mixed, and then placed in a collaborative smelting furnace. 30% oxygen-enriched air was blown into the furnace to burn the waste organic matter. The collaborative smelting temperature was 1300℃ and the collaborative smelting time was 70 min.

[0063] The composition and addition amounts of the multi-source copper-based solid waste are shown in Table 1. The calculated calorific value of the multi-source copper-based solid waste is 1.55 MJ / kg of copper-based waste. After one hour of smelting, the oxygen-enriched air was discontinued and 6 kg of waste resin powder was sprayed into the mixture. The mixture was allowed to stand for 10 minutes before the slag and copper were discharged. This yielded 197.0 kg of blister copper and 1238.5 kg of smelting slag.

[0064] The comprehensive recovery rate of copper is 98.19%, the comprehensive recovery rate of gold and silver is about 99%, and the comprehensive recovery rate of lead and zinc is greater than 80%; the melting point of the smelting slag is 1287℃, which is lower than the smelting temperature of 1300℃. The copper content in the slag is 0.26%, and the slag-copper separation effect is good.

[0065] Table 1 Raw materials of Example 1

[0066]

[0067] *Au-g / t

[0068] Example 2

[0069] This embodiment provides a method for recovering copper through autothermal synergistic smelting and enriching matte converting slag. The process is as follows: Figure 1 The specific process is as follows:

[0070] 1800 kg of copper-based waste and 3600 kg of hot matte converting slag were coarsely crushed, mixed and placed in a collaborative smelting furnace. 35% oxygen-enriched air was blown into the furnace to burn the waste organic matter. The smelting temperature was about 1280℃ and the collaborative smelting time was 100 min.

[0071] The composition and addition amounts of the multi-source copper-based solid waste are shown in Table 2. The calculated calorific value of the multi-source copper-based solid waste is 1.52 MJ / kg. After 1.5 hours of smelting, the oxygen-enriched air was discontinued and 25 kg of coke powder was injected. The mixture was allowed to stand for 10 minutes before the slag and copper were discharged. 427.5 kg of blister copper and 4175.5 kg of smelting slag were obtained.

[0072] The comprehensive recovery rate of copper is 98.01%, the comprehensive recovery rate of gold and silver is about 99%, and the comprehensive recovery rate of lead and zinc is greater than 80%; the melting point of the smelting slag is 1275℃, which is lower than the smelting temperature of 1280℃. The copper content in the slag is 0.19%, and the slag-copper separation effect is good.

[0073] Table 2 Raw materials of Example 2

[0074]

[0075] *Au-g / t

[0076] Example 3

[0077] This embodiment provides a method for recovering copper through autothermal synergistic smelting and enriching matte converting slag. The process is as follows: Figure 1 The specific process is as follows:

[0078] 300 kg of copper-based waste and 900 kg of hot matte converting slag were coarsely crushed, mixed and placed in a collaborative smelting furnace. 28% oxygen-enriched air was blown into the furnace to burn the waste organic matter. The smelting temperature was about 1320℃ and the collaborative smelting time was 100 min.

[0079] The composition and addition amounts of the multi-source copper-based solid waste are shown in Table 3. The calculated calorific value of the multi-source copper-based solid waste is 1.63 MJ / kg of copper-based waste. After 1.5 hours of smelting, the oxygen-enriched air was discontinued and 4 kg of coke powder was injected. The mixture was allowed to stand for 10 minutes before the slag and copper were discharged. 80.5 kg of blister copper and 958.0 kg of smelting slag were obtained.

[0080] The comprehensive recovery rate of copper is 98.12%, the comprehensive recovery rate of gold and silver is about 99%, and the comprehensive recovery rate of lead and zinc is greater than 80%; the melting point of the smelting slag is 1304℃, which is lower than the smelting temperature of 1320℃. The copper content in the slag is 0.14%, and the slag-copper separation effect is good.

[0081] Table 3 Raw materials of Example 3

[0082]

[0083] *Au-g / t

[0084] Comparative Example 1

[0085] This comparative example provides a method for autothermal synergistic smelting to recover copper and deplete matte converting slag. Compared with Example 1, no hot matte converting slag is added. The specific process is as follows:

[0086] 900 kg of multi-source copper-based solid waste was coarsely crushed and mixed and then placed in a synergistic smelting furnace. 30% oxygen-enriched air was blown into it to burn the waste organic matter. The synergistic smelting temperature was 1300℃ and the synergistic smelting time was 70 min.

[0087] The composition and addition amounts of the multi-source copper-based solid waste are shown in Table 1. The calculated calorific value of the multi-source copper-based solid waste is 1.55 MJ / kg of copper-based waste. After one hour of smelting, the oxygen-enriched air was discontinued and 6 kg of waste resin powder was sprayed into the mixture. The mixture was allowed to stand for 10 minutes before the slag and copper were discharged. This yielded 163.5 kg of blister copper and 445.0 kg of smelting slag.

[0088] The comprehensive recovery rate of copper is 93.43%, the comprehensive recovery rate of gold and silver is about 94%, and the comprehensive recovery rate of lead and zinc is less than 80%; the melting point of the smelting slag is 1366℃, which is higher than the smelting temperature of 1300℃. The slag viscosity is high, and the slag-copper separation effect is poor. The copper content in the slag is 2.48%, and the copper recovery rate is low.

[0089] Comparative Example 2

[0090] This comparative example provides a method for autothermal synergistic smelting to recover copper and deplete matte converting slag. Compared with Example 1, the calculated calorific value of the multi-component copper-based solid waste is 1.44 MJ / kg copper-based waste. The specific process is as follows:

[0091] 900 kg of multi-source copper-based solid waste and 900 kg of hot matte converting slag were coarsely crushed and mixed, and then placed in a collaborative smelting furnace. 30% oxygen-enriched air was blown into it to burn the waste organic matter. The collaborative smelting temperature was 1220℃ and the collaborative smelting time was 70 min.

[0092] The composition and addition amounts of the multi-source copper-based solid waste are shown in Table 4. The calculated calorific value of the multi-source copper-based solid waste is 1.44 MJ / kg of copper-based waste. After one hour of smelting, the oxygen-enriched air was discontinued and 6 kg of waste resin powder was injected. The mixture was allowed to stand for 10 minutes before the slag and copper were discharged. 223.5 kg of blister copper and 1188.0 kg of smelting slag were obtained.

[0093] The copper recovery rate is 91.41%, the gold and silver recovery rate is about 94%, and the lead and zinc recovery rate is less than 80%; the melting point of the smelting slag is 1283℃, which is higher than the smelting temperature of 1220℃. The slag viscosity is high, and the slag-copper separation effect is poor. The copper content in the slag is 1.51%, and the copper recovery rate is low.

[0094] Table 4 Raw materials of comparative example 2

[0095]

[0096] Comparative Example 3

[0097] This comparative example provides a method for autothermal synergistic smelting to recover copper and deplete matte converting slag. Compared with Example 1, an excess amount of hot matte converting slag is added. The specific process is as follows:

[0098] 900 kg of multi-source copper-based solid waste and 5000 kg of hot matte converting slag were coarsely crushed and mixed, and then placed in a collaborative smelting furnace. 30% oxygen-enriched air was blown into it to burn the waste organic matter. The collaborative smelting temperature was 1300℃ and the collaborative smelting time was 70 min.

[0099] The calculated calorific value of the multi-source copper-based solid waste was 1.55 MJ / kg. After one hour of smelting, the oxygen-enriched air was discontinued and 6 kg of waste resin powder was injected. The mixture was allowed to stand for 10 minutes before the slag and copper were discharged. 270 kg of blister copper and 4910 kg of smelting slag were obtained.

[0100] The comprehensive recovery rate of copper is 88.70%, the comprehensive recovery rate of gold and silver is about 96%, and the comprehensive recovery rate of lead and zinc is less than 60%; the melting point of the smelting slag is 1294℃, close to the smelting temperature of 1300℃; the reducing agent in the copper-based waste is not enough to reduce the valuable elements in the matte converting slag, the copper content in the slag is 0.59%, and the copper recovery rate is low.

[0101] The results of the collaborative melting in each embodiment and comparative example are shown in Table 5:

[0102] Table 5 Slag composition, copper content, melting point and copper recovery rate after collaborative smelting

[0103]

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0105] Furthermore, those skilled in the art will appreciate that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and to form distinct embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is intended solely to enhance understanding of the overall background of this application and should not be construed as an admission or any implication that such information constitutes prior art known to those skilled in the art.

Claims

1. A method for recovering copper by autothermal synergistic smelting and depleting matte converting slag, characterized in that: include: The liquid matte converting slag produced during the copper smelting process is directly discharged into a hot co-smelting furnace, and co-smelting is carried out under oxygen-enriched air conditions by adding co-smelting waste from multiple sources that have been co-crushed and mixed. The co-smelting includes a melting period, a depletion period, and a rest period. During the melting period, copper, aluminum, iron, lead and tin in the copper-based solid waste are rapidly melted to form first blister copper; During the depletion period, the aluminum and iron in the first blister copper and the organic matter in the copper-based solid waste act as reducing agents to reduce the copper, nickel, cobalt, zinc, and lead oxides in the matte converting slag into metallic state and enter the first blister copper to form the second blister copper, and the iron and aluminum are oxidized and enter the matte converting slag to form the second slag; During the standing period, a reducing agent is added and the blowing is terminated, and after standing, a third blister copper and a third slag are formed, which are discharged from the copper outlet and the slag outlet respectively, and the blister copper product is collected; The first blister copper comprises copper, aluminum, iron, lead, and tin; The second blister copper comprises copper, lead, tin, nickel, cobalt and zinc; The third blister copper comprises copper, lead, tin, nickel, cobalt and zinc; The matte converting slag is 60-500wt% of multi-source copper-based solid waste; The calorific value of the multi-source copper-based solid waste is 1.5-1.7 MJ / kg.

2. The method for recovering copper by autothermal synergistic smelting and depleting matte converting slag according to claim 1, characterized in that: The multi-source copper-based solid waste contains 10-30 wt% copper, and the matte converting slag contains 0.8-5 wt% copper, 45-60 wt% iron, and 25-35 wt% silicon dioxide.

3. The method for recovering copper by autothermal synergistic smelting and depleting matte converting slag according to claim 2, characterized in that: The multi-source copper-based solid waste includes slag-forming metals, and the slag-forming metals include iron and aluminum; the content of the slag-forming metals is 5-20 wt % of the multi-source copper-based solid waste.

4. The method for recovering copper by autothermal synergistic smelting and depleting matte converting slag according to claim 1, characterized in that: The temperature of the co-smelting is 1250-1350°C.

5. The method for recovering copper by autothermal synergistic smelting and depleting matte converting slag according to claim 1, characterized in that: The concentration of oxygen in the oxygen-enriched air is 25-40%.

6. The method for recovering copper by autothermal synergistic smelting and depleting matte converting slag according to claim 1, characterized in that: During the co-smelting and depletion period, under the disturbance of oxygen-rich air, the metallic iron and aluminum in the first blister copper and part of the organic matter in the copper-based solid waste are fully contacted with the matte converting slag, and the oxides of copper, lead, zinc, nickel and cobalt in the slag are reduced to metals and enter the blister copper to form the second blister copper, and the iron and aluminum are oxidized to oxides and enter the slag to form the second slag.

7. The method for recovering copper by autothermal synergistic smelting and depleting matte converting slag according to claim 1, characterized in that: During the depletion period, not less than 80 wt% of the copper in the converting slag is reduced and enters the first blister copper to form the second blister copper, and not less than 99 wt% of the iron and aluminum in the multi-source copper-based solid waste are oxidized and enter the matte converting slag to form the second slag.

8. The method for recovering copper by autothermal synergistic smelting and depleting matte converting slag according to any one of claims 1 to 7, characterized in that: The reducing agent includes waste resin, coke, coal, and charcoal, and the amount added is 0.1-2 wt % of the total amount of the multi-source copper-based solid waste and the matte converting slag.

Images