A method for co-processing arsenic-iron slag and iron slag produced in zinc smelting process

Abstract

This application provides a method for the co-processing of arsenic-iron slag and iron slag generated during zinc smelting, relating to the field of solid waste co-processing. The method includes: mixing arsenic-iron slag, iron slag, a reducing agent, and a flux to prepare pellets; smelting the pellets to obtain an arsenic-iron alloy and arsenic-containing flue gas; and using the cooled arsenic-containing flue gas to prepare the pellets. This solution achieves the co-processing and resource utilization of these two specific industrial wastes, not only reducing environmental impact but also recovering valuable metals from these slags. The reduction smelting process enables the co-utilization of arsenic-iron slag and iron slag, comprehensively utilizing the arsenic and iron generated during zinc smelting, achieving complete resource recovery of arsenic and iron, and reducing the risk of arsenic leakage.

Description

Technical Field

[0001] This application relates to the field of co-processing of solid waste, and more particularly to a method for co-processing arsenic iron slag and iron slag generated during zinc smelting. Background Technology

[0002] The traditional zinc smelting industry widely employs a roasting-acid leaching-purification-electrowinning process to recover and utilize zinc. In this process, after roasting, the arsenic-rich zinc concentrate is primarily enriched in the flue dust phase, leading to a significant increase in arsenic content in the secondary zinc oxide flue dust. Therefore, specialized arsenic removal treatment is necessary to meet production requirements. Currently, arsenic removal methods for arsenic-containing zinc oxide flue dust mainly include two technical routes: roasting and leaching. The leaching process transfers arsenic to the liquid phase through acidic leaching, followed by the addition of an iron ion source to form a stable arsenic-iron slag precipitate, thus completing the arsenic removal process. However, the resulting arsenic-iron slag is typically disposed of through landfill. Over time, the arsenic compounds in the landfill may gradually dissolve under natural environmental conditions, leaking through rainwater or groundwater, causing arsenic pollution of soil and groundwater resources, severely disrupting the regional ecosystem balance, and posing a potential threat to human health. Meanwhile, zinc smelting also generates a large amount of iron slag, which contains high levels of iron. Traditional processing involves using a rotary kiln to recover zinc through volatilization, followed by magnetic separation to enrich the iron, ultimately selling it as iron concentrate. However, this process has significant drawbacks, including complex procedures, high energy consumption, insufficient grade of the iron concentrate, limited economic value, and low overall iron recovery efficiency, leading to resource waste and poor economic returns. Therefore, the existing landfill disposal of arsenic-iron slag poses significant environmental safety hazards, and the recycling process for the iron slag is insufficient. A synergistic treatment solution that can simultaneously address arsenic pollution risks and improve resource recovery efficiency is urgently needed.

[0003] To address the aforementioned issues, existing technologies urgently need improvement. Summary of the Invention

[0004] The purpose of this application is to provide a method for the co-processing of arsenic iron slag and iron slag generated during zinc smelting, so as to solve the above-mentioned problems.

[0005] To achieve the above objectives, this application adopts the following technical solution: This application provides a method for the co-treatment of arsenic-iron slag and iron slag generated during zinc smelting, comprising: Arsenic-iron slag, iron slag, reducing agent, and flux are mixed to prepare pellets; The pellets are smelted to obtain an arsenic-iron alloy and arsenic-containing flue gas; the arsenic-containing flue gas is cooled and then used to prepare the pellets. The arsenic-iron slag contains 20.55-27.67% arsenic, 14.53-16.88% iron, 0.1-0.5% copper, and 3.05-5.30% zinc. The iron slag contains 22.38-26.83% iron, 6.35-9.79% zinc, 0.80-1.10% lead, 4.05-6.75% silicon dioxide, and 1.38-2.50% calcium oxide.

[0006] Optionally, the arsenic-iron slag includes arsenic-containing hazardous waste generated during the zinc oxide flue dust treatment process.

[0007] Optionally, the iron slag includes goethite slag and / or iron-vanadium slag.

[0008] Optionally, based on the mass of the arsenic-iron slag being 100%, the amount of iron slag added is 150-180%, the amount of reducing agent added is 10-30%, and the amount of flux added is 5-100%.

[0009] Optionally, the particle size of the pellet material is 0.5~2cm.

[0010] Optionally, the reducing agent includes at least one of anthracite, pulverized coal, charcoal, and coke.

[0011] Optionally, the flux includes at least one of CaF2, SiO2, CaO, CaCO3, and CaSO4.

[0012] Optionally, the melting temperature is 1100~1500℃ and the time is 2~8 hours.

[0013] Optionally, the smelting is carried out under inert gas protection, and the oxygen content during the smelting is 1-5%.

[0014] Optionally, the arsenic content in the arsenic-iron alloy is 20-30 wt% and the iron content is 60-70 wt%.

[0015] Compared with the prior art, the beneficial effects of this application include: Through the above technical solution, this application effectively solves the problem of process fluctuations caused by the uncertainty of iron slag sources. Specifically, goethite slag and ferrovanadium slag, as two typical industrial wastes with relatively stable compositions, make the proportion and properties of pellets easier to control, thereby improving the stability and efficiency of subsequent smelting processes. Furthermore, this solution achieves the co-processing and resource utilization of these two specific industrial wastes, not only reducing environmental impact but also recovering valuable metals from these slags. Through reduction smelting processes, the co-utilization of arsenic-iron slag and iron slag can be achieved, comprehensively utilizing the arsenic and iron generated during zinc smelting, realizing the complete resource recovery of arsenic and iron, reducing the risk of arsenic leakage, and simultaneously improving the iron recovery rate. This method, by co-processing arsenic-iron slag and iron slag generated during zinc smelting, effectively solves the environmental pollution problem that may result from arsenic-iron slag landfill, while simultaneously enhancing the recovery value of iron in the iron slag. Through the smelting process, arsenic is stably enriched in the arsenic-iron alloy, reducing its environmental migration risk. Furthermore, the recycling of arsenic-containing flue gas further improves the efficiency of arsenic recovery, realizes the resource utilization of waste, and reduces the generation of secondary pollution. Detailed Implementation

[0016] As used in this article: "Prepared from" is synonymous with "comprising". The terms "comprising", "including", "having", "containing", or any other variations thereof as used herein are intended to cover non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that includes the listed elements is not necessarily limited to those elements, but may include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0017] The conjunction "composed of..." excludes any unspecified elements, steps, or components. If used in a claim, this phrase makes the claim closed, excluding materials other than those described, except for associated conventional impurities. When the phrase "composed of..." appears in a clause of the body of a claim rather than immediately following it, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0018] When a quantity, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pair of any upper or preferred value with any lower or preferred value, regardless of whether the range is disclosed individually. For example, when the range “1–5” is disclosed, the described range should be interpreted as including ranges “1–4”, “1–3”, “1–2”, “1–2 and 4–5”, “1–3 and 5”, etc. When numerical ranges are described herein, unless otherwise stated, the range is intended to include its endpoints and all integers and fractions within that range.

[0019] In these embodiments, unless otherwise specified, the portions and percentages are all by weight.

[0020] "Parts by mass" refers to the basic unit of measurement that expresses the mass ratio of multiple components. One part can represent any unit mass, such as 1g or 2.689g. If we say that component A has "a" parts by mass and component B has "b" parts by mass, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it can mean that the mass of component A is aK and the mass of component B is bK (where K is any number representing a multiplier). It is important to understand that, unlike parts by mass, the sum of the mass parts of all components is not limited to 100 parts.

[0021] "And / or" is used to indicate that one or both of the described situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0022] To better explain the technical solution provided in this application, the technical solution provided in this application will be described in general before the specific implementation.

[0023] In the traditional zinc smelting industry, the arsenic-rich zinc concentrate produced is typically disposed of through landfilling, posing environmental risks such as arsenic dissolution and leakage, and pollution of soil and groundwater. Meanwhile, the iron slag generated during zinc smelting has a high iron content, and traditional processing methods result in low-value iron concentrate recovery and unsatisfactory recovery rates.

[0024] In this regard, this application provides a method for the co-treatment of arsenic-iron slag and iron slag generated during zinc smelting, comprising: Arsenic-iron slag, iron slag, reducing agent, and flux are mixed to prepare pellets; The pellets are smelted to obtain an arsenic-iron alloy and arsenic-containing flue gas; the arsenic-containing flue gas is cooled and then used to prepare the pellets.

[0025] Understandably, during the smelting process, the obtained pellets are smelted at high temperatures. An inert gas is introduced for protection during the smelting process. As smelting progresses, aluminum, calcium, and flux in the neutralized slag combine to form calcium-silicon slag, which enters the slag phase. Simultaneously, arsenic in the arsenic-iron slag and iron in the iron-containing materials are reduced to form an arsenic-iron alloy, which enters the alloy phase and separates from the slag phase. The flue gas generated during smelting is cooled and recovered, and the resulting arsenic-containing dust is returned to the pellet batching process. After smelting is completed, the slag is discharged from the slag outlet, and the resulting arsenic-iron alloy is discharged from the alloy outlet. Once the arsenic-iron alloy passes inspection, it is sold.

[0026] In an optional embodiment, the arsenic-iron slag contains 20.55-27.67% arsenic, 14.53-16.88% iron, 0.1-0.5% copper, and 3.05-5.30% zinc. The iron slag contains 22.38-26.83% iron, 6.35-9.79% zinc, 0.80-1.10% lead, 4.05-6.75% silicon dioxide, and 1.38-2.50% calcium oxide.

[0027] Optionally, the arsenic content in the arsenic-iron slag can be 20.55%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 27.67%, or any value between 20.55% and 27.67%; the copper content can be 14.53%, 15%, 15.5%, 16%, 16.88%, or any value between 14.53% and 16.88%; and the zinc content can be 3.05%, 3.5%, 4%, 4.5%, 5%, 5.3%, or any value between 3.05% and 5.30%.

[0028] Optionally, the iron content in the iron slag can be 22.38%, 22.5%, 23%, 23.5%, or 24%. The content of zinc can be 6.35%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 9.79%, or any value between 6.35% and 9.79%; the content of lead can be 0.80%, 0.90%, 1.0%, 1.10%, or any value between 0.80% and 1.10%; the content of silicon dioxide can be 4.05%, 4.5%, 5%, 5.5%, 6%, 6.5%, 6.75%, or any value between 4.05% and 6.75%; the content of calcium oxide can be 1.38%, 1.5%, 2%, 2.50%, or any value between 1.38% and 2.50%.

[0029] In some of the embodiments described above in this application, a method for the co-treatment of arsenic-iron slag and iron slag generated during zinc smelting is proposed. However, in actual industrial production, arsenic-iron slag comes from diverse sources and has complex compositions. In particular, some high-arsenic hazardous waste materials are difficult to treat and pose high environmental risks. If they are not effectively utilized and disposed of, they will have a serious impact on the environment and increase the burden on enterprises.

[0030] In an optional embodiment, the arsenic-iron slag includes arsenic-containing hazardous waste generated during the zinc oxide flue dust treatment process.

[0031] In an optional embodiment, the iron slag includes goethite slag and / or vanadium iron slag.

[0032] In one optional embodiment, based on the mass of the arsenic iron slag being 100%, the amount of iron slag added is 150-180%, the amount of reducing agent added is 10-30%, and the amount of flux added is 5-100%.

[0033] Optionally, in the raw materials for pelletizing, based on the mass of arsenic-iron slag as 100%, the amount of iron slag added can be 150%, 160%, 170%, 180%, or any value between 150% and 180%; the amount of reducing agent added can be 10%, 20%, 30%, or any value between 10% and 30%; the amount of flux added can be 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%, or any value between 5% and 100%.

[0034] In one optional embodiment, the particle size of the pellet material is 0.5~2cm.

[0035] Optionally, the particle size of the pellets can be 0.5cm, 1cm, 1.5cm, 2cm, or any value between 0.5cm and 2cm.

[0036] In one alternative embodiment, the reducing agent includes at least one of anthracite, pulverized coal, charcoal, and coke.

[0037] In an optional embodiment, the flux includes at least one of CaF2, SiO2, CaO, CaCO3, and CaSO4.

[0038] In one optional embodiment, the melting temperature is 1100~1500℃ and the time is 2~8 hours.

[0039] Optionally, the capacity temperature can be 1100℃, 1200℃, 1300℃, 1400℃, 1500℃, or any value between 1100℃ and 1500℃; the melting temperature can be 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours, 8 hours, or any value between 2 hours and 8 hours.

[0040] In an optional embodiment, the smelting is carried out under inert gas protection, and the oxygen content during the smelting is 1-5%.

[0041] Optionally, the oxygen content during smelting can be 1%, 2%, 3%, 4%, 5%, or any value between 1% and 5%.

[0042] In an optional embodiment, the arsenic content in the arsenic-iron alloy is 20-30 wt% and the iron content is 60-70 wt%.

[0043] Optionally, the arsenic content in the arsenic-iron alloy can be 20wt%, 22wt%, 24wt%, 26wt%, 28wt%, 30wt%, or any value between 20-30wt%.

[0044] The implementation schemes of this application will be described in detail below with reference to specific embodiments. However, those skilled in the art will understand that the following embodiments are only for illustrating this application and should not be regarded as limiting the scope of this application. Unless otherwise specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments used without specified manufacturers are all conventional products that can be purchased commercially.

[0045] In the examples and comparative examples, the arsenic-iron slag used is arsenic-containing hazardous waste produced during the zinc oxide flue dust treatment process, and the iron slag is iron slag produced during the zinc smelting process, such as goethite, iron vanadium slag, and other iron-containing slags.

[0046] Example 1 This embodiment provides a method for the co-treatment of arsenic-iron slag and iron slag generated during zinc smelting, the specific steps of which are as follows: Take 200g of arsenic-iron slag powder (its main components are shown in Table 1, with the remainder being water of crystallization or hydroxide ions), 320g of iron slag (its main components are shown in Table 1, with the remainder being water of crystallization or hydroxide ions), 35g of anthracite, 65g of CaO, and 55g of SiO2 and mix them. After spraying 10% distilled water into the above materials, mix them evenly and then press them into granules at a pressure of 20MPa. The pressed granules are dried in an oven at 100℃ for 12 hours to obtain pellets with a particle size of 1.5cm.

[0047] The dried lumps were placed in a high-temperature muffle furnace and smelted at 1350℃ for 3 hours. After smelting, the material was cooled and the slag and gold were separated to obtain 176.3g of arsenic-iron alloy, 155.6g of smelting slag, and arsenic-containing flue gas. The arsenic-containing flue gas was cooled and used to prepare pellets.

[0048] The composition of the materials used, as well as the composition of the resulting ferroarsenic alloy and smelting slag, is shown in Table 1. Table 1. Composition of materials, ferroarsenic alloy, and smelting slag in Example 1.

[0049] Example 2 This embodiment provides a method for the co-treatment of arsenic-iron slag and iron slag generated during zinc smelting, the specific steps of which are as follows: Take 200g of arsenic-iron slag powder (its main components are shown in Table 2, with the remainder being water of crystallization or hydroxide ions), 320g of iron slag (its main components are shown in Table 2, with the remainder being water of crystallization or hydroxide ions), 45.45g of anthracite, 158.02g of CaSO4, and 55g of SiO2 and mix them. After spraying 10% distilled water into the above materials, mix them evenly and then press them into granules at a pressure of 20MPa. The pressed granules are dried in an oven at 100℃ for 12 hours to obtain pellets with a particle size of 1.5cm.

[0050] The dried lumps were placed in a high-temperature muffle furnace and smelted at 1350℃ for 2 hours. After smelting, the material was cooled and the slag and gold were separated to obtain 175.9g of arsenic-iron alloy, 155.6g of smelting slag, and arsenic-containing flue gas. The arsenic-containing flue gas was cooled and used to prepare pellets.

[0051] The composition of the materials used, as well as the composition of the resulting ferroarsenic alloy and smelting slag, is shown in Table 2. Table 2. Composition of materials, ferroarsenic alloy, and smelting slag in Example 2.

[0052] Example 3 This embodiment provides a method for the co-treatment of arsenic-iron slag and iron slag generated during zinc smelting, the specific steps of which are as follows: Take 200g of arsenic-iron slag powder (its main components are shown in Table 3, with the remainder being water of crystallization or hydroxide ions), 320g of iron slag (its main components are shown in Table 3, with the remainder being water of crystallization or hydroxide ions), 35g of anthracite, 90.62g of CaF2, and 55g of SiO2 and mix them. After spraying 10% distilled water into the above materials, mix them evenly and then press them into granules at a pressure of 20MPa. The pressed granules are then dried in an oven at 100℃ for 12 hours to obtain pellets with a particle size of 1.5cm.

[0053] The dried lumps were placed in a high-temperature muffle furnace and smelted at 1350℃ for 2 hours. After smelting, the material was cooled and the slag and gold were separated to obtain 173.8g of arsenic-iron alloy, 152.8g of smelting slag, and arsenic-containing flue gas. The arsenic-containing flue gas was cooled and used to prepare pellets.

[0054] The composition of the materials used, as well as the composition of the resulting ferroarsenic alloy and smelting slag, is shown in Table 3. Table 3. Composition of materials, ferroarsenic alloy, and smelting slag in Example 3.

[0055] Example 4 This embodiment provides a method for the co-treatment of arsenic-iron slag and iron slag generated during zinc smelting, the specific steps of which are as follows: Take 200g of arsenic-iron slag powder (its main components are shown in Table 4, with the remainder being water of crystallization or hydroxide ions), 320g of iron slag (its main components are shown in Table 4, with the remainder being water of crystallization or hydroxide ions), 35g of anthracite, 116.18g of CaCO3, and 55g of SiO2 and mix them. After spraying 10% distilled water into the above materials, mix them evenly and then press them into granules at a pressure of 20MPa. The pressed granules are then dried in an oven at 100℃ for 12 hours to obtain pellets with a particle size of 1.5cm.

[0056] The dried lumps were placed in a high-temperature muffle furnace and smelted at 1350℃ for 3 hours. After smelting, the material was cooled and the slag and gold were separated to obtain 177.05g of arsenic-iron alloy, 156.20g of smelting slag, and arsenic-containing flue gas. The arsenic-containing flue gas was cooled and used to prepare pellets.

[0057] The composition of the materials used, as well as the composition of the resulting ferroarsenic alloy and smelting slag, is shown in Table 4. Table 4. Composition of materials, ferroarsenic alloy, and smelting slag in Example 4.

[0058] Comparative Example 1 This comparative example provides a method for treating iron slag generated during the smelting of arsenic-iron slag and zinc. The only difference from Example 1 is that the amount of iron slag added is 80g. After smelting, the material is cooled, and the slag and metal are separated to obtain 70.35g of arsenic-iron alloy, 158.7g of smelting slag, and arsenic-containing flue gas. The arsenic-containing flue gas is cooled and used to prepare pellets.

[0059] The composition of the materials used, as well as the composition of the resulting ferroarsenic alloy and smelting slag, is shown in Table 5. Table 5 shows the composition of the materials, ferroarsenic alloy, and smelting slag in Comparative Example 1.

[0060] Comparative Example 2 This comparative example provides a method for treating iron slag generated during the smelting of arsenic-iron slag and zinc. The only difference from Example 1 is that the amount of CaO added is 8g. After smelting, the material is cooled, and the slag and metal are separated to obtain 85.32g of arsenic-iron alloy, 198.5g of smelting slag, and arsenic-containing flue gas. The arsenic-containing flue gas is cooled and used to prepare pellets.

[0061] The composition of the materials used, as well as the composition of the resulting ferroarsenic alloy and smelting slag, is shown in Table 6. Table 6 shows the composition of materials, ferroarsenic alloy, and smelting slag in Comparative Example 2.

[0062] Comparative Example 3 This comparative example provides a method for treating iron slag generated during the smelting of arsenic-iron slag and zinc. The only difference from Example 1 is that the smelting temperature is 1000℃. After smelting, the material was cooled, but no significant slag-metal separation effect was achieved, and no alloy phase was obtained.

[0063] Comparative Example 4 This comparative example provides a method for treating iron slag generated during the smelting of arsenic-iron slag and zinc. The only difference from Example 1 is that the amount of anthracite added is 2g. After smelting, the material is cooled, and the slag and metal are separated to obtain 30.8g of arsenic-iron alloy, 300.5g of smelting slag, and arsenic-containing flue gas. The arsenic-containing flue gas is cooled and used to prepare pellets.

[0064] The composition of the materials used, as well as the composition of the resulting ferroarsenic alloy and smelting slag, is shown in Table 7. Table 7 shows the composition of materials, ferroarsenic alloy, and smelting slag in Comparative Example 4.

[0065] As can be seen from the above embodiments and comparative examples: In Comparative Example 1, the reduced amount of iron slag led to an increase in arsenic volatilization, exceeding 60%, resulting in a significant decrease in arsenic recovery. In Comparative Example 2, the reduced amount of calcium oxide led to an increase in arsenic volatilization, exceeding 54%, again resulting in a significant decrease in arsenic recovery. In Comparative Example 4, the reduced amount of anthracite led to a significant increase in arsenic volatilization, exceeding 78%, again resulting in a significant decrease in arsenic recovery.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0067] Furthermore, those skilled in the art will understand 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 form different embodiments. For example, in the foregoing claims, any of the claimed embodiments can be used in any combination. The information disclosed in this background section is intended only to enhance the understanding of the general background of this application and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

Claims

1. A method for the co-treatment of arsenic-iron slag and iron slag generated during zinc smelting, characterized in that, include: Arsenic-iron slag, iron slag, reducing agent, and flux are mixed to prepare pellets; The pellets are smelted to obtain an arsenic-iron alloy and arsenic-containing flue gas; the arsenic-containing flue gas is cooled and then used to prepare the pellets. The arsenic-iron slag contains 20.55-27.67% arsenic, 14.53-16.88% iron, 0.1-0.5% copper, and 3.05-5.30% zinc. The iron slag contains 22.38-26.83% iron, 6.35-9.79% zinc, 0.80-1.10% lead, 4.05-6.75% silicon dioxide, and 1.38-2.50% calcium oxide.

2. The method for co-processing arsenic-iron slag and iron slag generated during zinc smelting according to claim 1, characterized in that, The arsenic-iron slag includes arsenic-containing hazardous waste generated during the zinc oxide flue dust treatment process.

3. The method for co-processing arsenic-iron slag and iron slag generated during zinc smelting according to claim 1, characterized in that, The iron slag includes goethite slag and / or iron-vanadium slag.

4. The method for co-processing arsenic-iron slag and iron slag generated during zinc smelting according to claim 1, characterized in that, Based on the mass of the arsenic-iron slag being 100%, the amount of iron slag added is 150-180%, the amount of reducing agent added is 10-30%, and the amount of flux added is 5-100%.

5. The method for co-processing arsenic-iron slag and iron slag generated during zinc smelting according to claim 1, characterized in that, The particle size of the pellets is 0.5~2cm.

6. The method for co-processing arsenic-iron slag and iron slag generated during zinc smelting according to claim 1, characterized in that, The reducing agent includes at least one of anthracite, pulverized coal, charcoal, and coke.

7. The method for co-processing arsenic-iron slag and iron slag generated during zinc smelting according to claim 1, characterized in that, The flux includes at least one of CaF2, SiO2, CaO, CaCO3, and CaSO4.

8. The method for co-processing arsenic-iron slag and iron slag generated during zinc smelting according to claim 1, characterized in that, The melting temperature is 1100~1500℃, and the time is 2~8 hours.

9. The method for co-processing arsenic-iron slag and iron slag generated during zinc smelting according to claim 8, characterized in that, The smelting is carried out under inert gas protection, and the oxygen content during the smelting is 1-5%.

10. The method for co-processing arsenic-iron slag and iron slag generated during zinc smelting according to any one of claims 1 to 9, characterized in that, The arsenic-iron alloy contains 20-30 wt% arsenic and 60-70 wt% iron.

Images