Insnzn liquid metal alloy and method for directly preparing the same from ironmaking sludge

Abstract

The present application relates to non-ferrous alloy production technical field, especially to a kind of InSnZn liquid metal alloy and the method for preparing it directly from iron-making sludge, comprising: iron-making sludge is made into ore pulp and carries out cyclone classification, and overflow material and tailings are obtained;The overflow material is dried to obtain indium-rich material;After adding coal powder to indium-rich material, vacuum smelting is carried out and bag dust collection is used, and smoke dust and iron-rich slag are obtained;The smoke dust is subjected to acid leaching, and leaching solution is obtained;The leaching solution is subjected to centrifugal extraction, and extraction organic phase is obtained, the extraction organic phase is subjected to back extraction using back extraction agent, and back extraction liquid is obtained;The back extraction liquid is subjected to electrolytic treatment, and InSnZn liquid metal alloy is obtained.The present application innovatively uses cyclone and vacuum thermal reduction method to efficiently realize the enrichment of ultra-low content indium element in iron-making sludge, and efficiently realizes the problem that ultra-low indium content raw material cannot be used for the production of indium-based materials at low cost.

Description

Technical Field

[0001] This invention relates to the field of non-ferrous metal smelting and production technology, and in particular to an InSnZn liquid metal alloy and a method for directly preparing it from ironmaking sludge. Background Technology

[0002] Indium is an important rare and dispersed metal, one of the rarest elements on Earth, with a low and dispersed distribution, its abundance in the Earth's crust being only 0.05-0.072 ppm. In recent years, new applications for indium have been gradually developed, and it is widely used in display materials, solar cells, optoelectronics, fiber optic communications, atomic energy, national defense, and modern information technology, possessing significant strategic value. Compared to the more researched gallium-based liquid metal materials, indium-based liquid metal materials have unique characteristics such as a higher melting point (50-200℃) and stronger corrosion resistance, and are used in special welding, mold filling, and nuclear energy equipment. The Panxi vanadium-titanium magnetite resource is an important strategic resource of iron, vanadium, and titanium in my country, with proven reserves of 10 billion tons. The Panxi vanadium-titanium magnetite also contains various rare elements and trace amounts of precious metals, among which the total reserves of indium are approximately 500 tons. During the blast furnace smelting process, the gas produced by the ironmaking blast furnace is purified and dust is removed. This dust removal process generates various solid wastes, including ironmaking sludge collected by wet scrubbers. Ironmaking sludge contains small amounts of elements such as indium, tin, and zinc. Previous work has shown that indium from vanadium-titanium magnetite is enriched in blast furnace gas sludge, indicating significant potential for comprehensive utilization.

[0003] Therefore, conducting research on the recovery and utilization of high-value strategic metal elements such as indium from vanadium-titanium magnetite smelting sludge is of great significance to the sustainable development of various industries.

[0004] Therefore, existing technologies still need improvement. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention proposes an InSnZn liquid metal alloy and a method for directly preparing it from iron smelting sludge, thereby solving the problem of indium resource recovery from iron smelting sludge in the prior art.

[0006] To address the aforementioned technical problems, some embodiments of the present invention disclose a method for directly preparing InSnZn liquid metal alloy from iron smelting sludge, comprising:

[0007] Step 1: Prepare iron smelting sludge into a slurry and perform hydrocyclone classification to obtain overflow material and tailings;

[0008] Step 2: Dry the overflow material to obtain indium-rich material;

[0009] Step 3: After adding coal powder to the indium-rich material, vacuum smelting is carried out and dust is collected using a bag filter to obtain smoke dust and iron-rich slag;

[0010] Step 4: The soot is acidically leached to obtain a leachate;

[0011] Step 5: Centrifuge the leachate to obtain the extracted organic phase, and then back-extract the extracted organic phase using a back-extraction agent to obtain the back-extraction solution.

[0012] Step 6: Electrolyze the back-extraction solution to obtain an InSnZn liquid metal alloy.

[0013] In some embodiments, the overflow material comprises, by mass content: In 150-300 ppm, Fe2O3 20%-22%, ZnO 47%-49%, SiO2 3%-5%, CaO 2%-3%, TiO2 2%-3%, Cl 2%-3%, and SnO2 0.6%-0.7%.

[0014] In some embodiments, the ironmaking sludge is vanadium-titanium magnetite blast furnace gas sludge, and its composition, by mass content, includes:

[0015] In49-82ppm, Fe2O339.1-54.5%, C 11.8-14.4%, ZnO 9.15-13.1%, SiO23.9-7.81%, CaO 4.7-6.28%, TiO24.2-4.98%, Cl 3.5-4.10%, SnO20.29-0.34%;

[0016] Alternatively, the slurry mass concentration is 17%-23%;

[0017] Alternatively, the temperature of the vacuum melting is 710℃-850℃;

[0018] Alternatively, step two may also include: returning the tailings to the iron ore sintering process for recycling;

[0019] Alternatively, step three may also include: the iron-rich slag is magnetically separated to obtain reduced iron powder product.

[0020] In some embodiments, in step three, the amount of coal powder added is 15%-25% of the total mass of the indium-rich material.

[0021] In some embodiments, in step four, the liquid-to-solid ratio of the acid leaching is 4.5:1-6:1 by mass, the leaching temperature is 50-85℃, and the acid leaching is carried out with sulfuric acid at a concentration of 200-300 g / L.

[0022] In some embodiments, in step five, the extractant for centrifugal extraction, by mass fraction, includes:

[0023] Cyanex 27225-35%,

[0024] P20413-15%,

[0025] N2358-15%,

[0026] The remainder is sulfonated kerosene diluent.

[0027] In some embodiments, in step five, the stripping agent is pure water or a 20-50 g / L sodium hydroxide solution.

[0028] In some embodiments, in step six, the cathode used in the electrolytic treatment is a TA1 plate or a TA2 plate, and the anode is an indium plate.

[0029] In some embodiments, in step six, the InSnZn liquid metal alloy contains 60%-85% In, 8%-20% Sn, and 4%-20% Zn by mass percentage.

[0030] On the other hand, this embodiment of the invention also discloses an InSnZn liquid metal alloy, characterized in that, by mass percentage, In is 60%-85%, Sn is 8%-20%, Zn is 4%-20%, and the melting point is 110-130℃.

[0031] By adopting the above technical solution, the present invention has at least the following beneficial effects:

[0032] This invention provides an InSnZn liquid metal alloy and a method for directly preparing it from ironmaking sludge. It innovatively employs a hydrocyclone and vacuum thermal reduction method to efficiently enrich ultra-low indium content in ironmaking sludge, addressing the problem of using ultra-low indium content raw materials that cannot be used in the production of indium-based materials at low cost and high efficiency. Through processes such as hydrocyclone-reducing vacuum melting-acid leaching-extraction-purification-electrolysis, comprehensive utilization of high-titanium blast furnace gas sludge is achieved, realizing the resource-based treatment of elements such as Fe, C, Zn, and Sn. While extracting indium, all Fe, C, Zn, and Sn resources are returned to the main process or utilized after simple treatment, realizing the treatment and comprehensive utilization of ironmaking sludge. Waste sulfuric acid generated during the sulfuric acid process for titanium dioxide production can be acidified for treatment, enabling the treatment and comprehensive utilization of this industry wastewater, while reducing the pressure of neutralizing and disposing of titanium dioxide waste acid. The obtained InSnZn liquid metal material has a melting point of 110-130℃ and can be used in special welding, mold filling, nuclear energy equipment, and other fields. Furthermore, this invention uses industrial sludge and industrial wastewater as the main raw materials for direct preparation, eliminating the need for expensive high-purity indium, tin, zinc and other metal materials, thus reducing costs. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a flowchart illustrating a method for directly preparing InSnZn liquid metal alloy from iron smelting sludge, as disclosed in some embodiments of the present invention. Detailed Implementation

[0035] The embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this disclosure by way of example, but should not be used to limit the scope of this disclosure. This disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0036] These embodiments are provided to make the disclosure thorough and complete, and to fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0037] It should be noted that, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] Furthermore, the terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0039] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure depending on the specific circumstances. When a particular device is described as being located between a first device and a second device, an intermediary device may or may not be present between the particular device and the first or second device.

[0040] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0041] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0042] like Figure 1 As shown, some embodiments of the present invention disclose a method for directly preparing InSnZn liquid metal alloy from iron smelting sludge. Compared with ordinary iron smelting dust, vanadium-titanium magnetite iron smelting sludge has a significantly different composition, characterized by high impurities, high titanium content, and low indium content. The embodiments of the present invention mainly involve treating vanadium-titanium magnetite iron smelting sludge with ultra-low indium content (below 100 g / t) to directly prepare InSnZn type liquid metal materials. This method is energy-efficient, simple, and economical. Specifically, it may include:

[0043] Step 1: Prepare iron smelting sludge into a slurry and perform hydrocyclone classification to obtain overflow material and tailings.

[0044] The iron smelting sludge is vanadium-titanium magnetite blast furnace gas sludge, and its components include:

[0045] The iron smelting sludge contains 49-82 ppm of In, 39.1-54.5% of Fe2O3, 11.8-14.4% of C, 9.15-13.1% of ZnO, 3.9-7.81% of SiO2, 4.7-6.28% of CaO, 4.2-4.98% of TiO2, 3.5-4.10% of Cl, and 0.29-0.34% of SnO2. Water is added to prepare a slurry with a mass concentration of 17%-23%, which is then added to a hydrocyclone for hydraulic cyclone classification. The hydrocyclone can be either FX-150 or FX-100, with a sand discharge nozzle diameter of 14-23 mm. Overflow material and tailings are obtained separately. The overflow material, i.e., fine material, consists of the following components by mass percentage: In 150-300 ppm, Fe2O3 20%-22%, ZnO 47%-49%, SiO2 3%-5%, CaO 2%-3%, TiO2 2%-3%, Cl 2%-3%, and SnO2 0.6%-0.7%. The tailings, i.e., coarse material, can be returned to the iron ore sintering process for recycling.

[0046] Step 2: Dry the overflow material to obtain indium-rich material; the drying temperature is 100-120℃.

[0047] Step 3: After adding pulverized coal to the indium-rich material, vacuum smelting is carried out and dust is collected using a bag filter to obtain smoke and iron-rich slag; the indium-rich material is reduced using pulverized coal with a purity >99%, wherein the amount of pulverized coal added is 15%-25% of the total mass of the indium-rich material, and the vacuum smelting temperature is 710-850℃; the iron-rich slag is magnetically separated to obtain reduced iron powder product.

[0048] Step 4: Perform acid leaching on the soot to obtain a leachate; sulfuric acid of a certain concentration can be used for acid leaching, and the liquid-to-solid ratio of the acid leaching can be 4.5:1-6:1 by mass, and the leaching temperature is 50-85℃.

[0049] Step 5: Centrifuge the leachate to obtain an extracted organic phase. Then, back-extract the extracted organic phase using a back-extracting agent to obtain a back-extract. The extractant used in the centrifugal extraction, by mass percentage, comprises: 25%-35% Cyanex 272 (a thioacidic phosphorus extractant), 13%-15% P2O4, 8%-15% N235, with the balance being sulfonated kerosene diluent. The back-extracting agent is pure water or a 20-50 g / L sodium hydroxide solution.

[0050] Step Six: Electrolyze the stripping solution to obtain an InSnZn liquid metal alloy. The cathode used in the electrolysis is a TA1 or TA2 plate, and the anode is an indium plate. By mass percentage, the InSnZn liquid metal alloy contains 60%-85% In, 8%-20% Sn, and 4%-20% Zn, with a melting point of 110-130℃.

[0051] Example 1

[0052] A method for directly preparing InSnZn liquid metal alloy from iron smelting sludge includes:

[0053] (1) Vanadium-titanium magnetite blast furnace gas sludge was prepared into a slurry with a concentration of 17%. A hydrocyclone (model FX-150) with a 20 mm diameter underflow nozzle was used for hydrocyclone classification. The feed concentration was 17%, yielding overflow and tailings. The composition of the ironmaking sludge included: In 68 ppm, Fe2O3 44.5%, C 14.4%, ZnO 9.15%, SiO2 7.81%, CaO 6.28%, TiO2 4.98%, Cl 4.10%, SnO2 0.34%. The overflow composition, by mass percentage, was: In 220 ppm, Fe2O3 20%, ZnO 47%, SiO2 4%, CaO 2.6%, TiO2 2.3%, Cl 2.5%, SnO2 0.6%.

[0054] (2) After drying the overflow material (fine material) from step (1), indium-rich material is obtained, and the tailings (coarse material) from step (1) are returned to the iron ore sintering process for recycling.

[0055] (3) After mixing the indium-rich material from step (2) with pulverized coal, vacuum smelting was carried out at a certain temperature and dust was collected using a bag filter to obtain flue dust and iron-rich slag. The amount of pulverized coal added was 20%.

[0056] (4) After magnetic separation, the iron-rich slag in step (3) can be used to obtain reduced iron powder with a purity of >99.9%.

[0057] (5) The dust from step (3) is acidically leached with sulfuric acid to obtain a leachate. The solid-to-leach ratio of the leachate is 5:1, and the leaching temperature is 70-80℃. The sulfuric acid concentration during leaching is 200 g / L. Some waste sulfuric acid generated from the hydrolysis process of the sulfuric acid method titanium dioxide plant is added, and the sulfuric acid mass concentration is 20%.

[0058] (6) The leachate from step (5) is centrifuged to extract the organic phase. The diameter of the centrifugal extractor drum is 100 mm, and the operating speed is 5000 rpm. The extractant composition is: 30% of thioacidic phosphorus extractant Cyanex 272, 14% of P2O4, 11% of N235, and the balance is sulfonated kerosene diluent.

[0059] (7) The organic phase extracted in step (6) is back-extracted using a back-extracting agent to obtain a back-extracting solution. The back-extracting agent is pure water.

[0060] (8) Electrolyze the stripping solution from step (7) to obtain an InSnZn liquid metal alloy. The cathode used in the electrolysis process is a titanium plate (TA1), and the anode is an indium plate (indium purity 99%-99.9%). In the obtained InSnZn liquid metal alloy, the proportions of indium, tin, and zinc are In 72%, Sn 16%, and Zn 12%, and the alloy melting point is 119℃.

[0061] Example 2

[0062] A method for directly preparing InSnZn liquid metal alloy from iron smelting sludge includes:

[0063] (1) Vanadium-titanium magnetite blast furnace gas sludge was prepared into a slurry with a concentration of 23%. A hydrocyclone (model FX-100) with a sand discharge nozzle diameter of 14 mm was used for hydraulic hydrocyclone classification. The feed concentration was 23%, yielding overflow and tailings. The composition of this ironmaking sludge included: In 82 ppm, Fe2O3 39.1%, C 12.0%, ZnO 13.1%, SiO2 4.7%, CaO 4.7%, TiO2 4.2%, Cl 3.5%, and SnO2 0.31%.

[0064] The composition of the overflow material, by mass percentage, is as follows: In 300 ppm, Fe2O3 22%, ZnO 49%, SiO2 3%, CaO 2%, TiO2 2.1%, Cl 2.1%, SnO2 0.6%.

[0065] (2) After drying the overflow material (fine material) from step (1), indium-rich material is obtained, and the tailings (coarse material) from step (1) are returned to the iron ore sintering process for recycling.

[0066] (3) After mixing the indium-rich material from step (2) with pulverized coal, vacuum smelting was carried out at a certain temperature and dust was collected using a bag filter to obtain flue dust and iron-rich slag. The amount of pulverized coal added was 25%.

[0067] (4) After magnetic separation, the iron-rich slag in step (3) can be used to obtain reduced iron powder with a purity of >99.9%.

[0068] (5) The dust from step (3) is acidically leached with sulfuric acid to obtain a leachate. The solid-to-liquid ratio of the leachate is 4.5:1, and the leaching temperature is 50-60℃. The sulfuric acid concentration during leaching is 175 g / L. Some waste sulfuric acid generated from the hydrolysis process of the sulfuric acid method titanium dioxide plant is added, and the sulfuric acid mass concentration is 20%.

[0069] (6) The leachate from step (5) is centrifuged to extract the organic phase. The diameter of the centrifugal extractor drum is 120 mm and the operating speed is 4000 rpm. The extractant composition is: 25% Cyanex 272 (thioacidic phosphorus type extractant), 15% P2O4, 8% N235, and the balance is sulfonated kerosene diluent.

[0070] (7) The organic phase extracted in step (6) is back-extracted using a back-extracting agent to obtain a back-extracting solution. The back-extracting agent is a 20 g / L sodium hydroxide solution.

[0071] (8) Electrolyze the back-extraction solution from step (7) under certain conditions to obtain an InSnZn liquid metal alloy. The cathode used in the electrolysis process is a titanium plate (TA2), and the anode is a metal indium plate (indium purity 99%-99.9%). In the obtained InSnZn liquid metal alloy, the proportions of indium, tin, and zinc elements are In 60%, Sn 20%, and Zn 20%, and the alloy melting point is 112℃.

[0072] Example 3

[0073] A method for directly preparing InSnZn liquid metal alloy from iron smelting sludge includes:

[0074] (1) Vanadium-titanium magnetite blast furnace gas sludge was prepared into a slurry with a concentration of 20%. A hydrocyclone (model FX-150) with a 23 mm diameter underflow nozzle was used for hydrocyclone classification. The feed concentration was 20%, yielding overflow and tailings. The composition of this ironmaking sludge included: In 49 ppm, Fe2O3 40.2%, C 11.8%, ZnO 12.5%, SiO2 3.9%, CaO 5.2%, TiO2 4.2%, Cl 3.5%, and SnO2 0.29%.

[0075] The composition of the overflow material, by mass percentage, is as follows: In 150 ppm, Fe2O3 20%, ZnO 47%, SiO 25%, CaO 3%, TiO 22.8%, Cl 2.8%, SnO 20.7%.

[0076] (2) After drying the overflow material (fine material) from step (1), indium-rich material is obtained, and the tailings (coarse material) from step (1) are returned to the iron ore sintering process for recycling.

[0077] (3) After mixing the indium-rich material from step (2) with pulverized coal, vacuum smelting was carried out at a certain temperature and dust was collected using a bag filter to obtain flue dust and iron-rich slag. The amount of pulverized coal added was 15%.

[0078] (4) After magnetic separation, the iron-rich slag in step (3) can be used to obtain reduced iron powder with a purity of >99.9%.

[0079] (5) The dust from step (3) is acidically leached with sulfuric acid to obtain a leachate. The solid-to-leach ratio of the leachate is 6:1, and the leaching temperature is 75-85℃. The sulfuric acid concentration during leaching is 250 g / L. Some waste sulfuric acid generated from the hydrolysis process of the sulfuric acid method titanium dioxide plant can be added, with a sulfuric acid mass concentration of 20%.

[0080] (6) The leachate from step (5) is centrifuged to extract the organic phase. The diameter of the centrifugal extractor drum is 100 mm and the operating speed is 5000 rpm. The extractant composition is: 35% of thioacidic phosphorus extractant Cyanex 272, 13% of P2O4, 15% of N235, and the balance is sulfonated kerosene diluent.

[0081] (7) The organic phase extracted in step (6) is back-extracted using a back-extracting agent to obtain a back-extracting solution. The back-extracting agent is a 50 g / L sodium hydroxide solution.

[0082] (8) Electrolyze the back-extraction solution from step (7) under certain conditions to obtain an InSnZn liquid metal alloy. The cathode used in the electrolysis process is a titanium plate (TA1), and the anode is an indium plate (indium purity 99%-99.9%). The proportions of indium, tin, and zinc in the InSnZn liquid metal are In 85%, Sn 8%, and Zn 7%, and the alloy melting point is 110-130℃.

[0083] In summary, the method for directly preparing InSnZn liquid metal alloy from ironmaking sludge disclosed in this invention innovatively employs hydrocyclone and vacuum thermal reduction to efficiently enrich ultra-low indium content in ironmaking sludge, thus solving the problem of using ultra-low indium content raw materials for indium-based material production at low cost and high efficiency. Through processes such as hydrocyclone-reducing vacuum melting-acid leaching-extraction-purification-electrolysis, comprehensive utilization of high-titanium blast furnace gas sludge is achieved, realizing the resource-based treatment of elements such as Fe, C, Zn, and Sn. While extracting indium, all resources such as Fe, C, Zn, and Sn are returned to the main process or utilized after simple treatment, achieving the treatment and comprehensive utilization of ironmaking sludge. Waste sulfuric acid generated during the sulfuric acid process for titanium dioxide production can be used for acidolysis treatment, enabling the treatment and comprehensive utilization of this industry wastewater, while reducing the pressure of neutralizing and disposing of titanium dioxide waste acid. The obtained InSnZn liquid metal material has a melting point of 110-130℃ and can be used in special welding, mold filling, nuclear energy equipment, and other fields. Furthermore, this invention uses industrial sludge and industrial wastewater as the main raw materials for direct preparation, eliminating the need for expensive high-purity indium, tin, zinc and other metal materials, thus reducing costs.

[0084] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0085] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner.

Claims

1. A method for directly producing an InSnZn liquid metal alloy from ironmaking sludge, characterized by, The application relates to a method for extracting indium from iron-making sludge. The method comprises the following steps: Step 1: iron-making sludge is made into a slurry and subjected to cyclone classification to obtain overflow material and tailings; Step 2: the overflow material is subjected to drying treatment to obtain indium-rich material; Step 3: coal powder is added to the indium-rich material, vacuum smelting is carried out, and a bag dust collector is used to obtain smoke dust and iron-rich slag, wherein the temperature of the vacuum smelting is 710-850 DEG C, and the addition amount of the coal powder is 15-25% of the total mass of the indium-rich material; Step 4: the smoke dust is subjected to acid leaching to obtain a leaching solution; Step 5: the leaching solution is subjected to centrifugal extraction to obtain an extraction organic phase, the extraction organic phase is subjected to back extraction using a back extraction agent to obtain a back extraction solution; Step 6: the back extraction solution is subjected to electrolytic treatment to obtain an InSnZn liquid metal alloy. The composition of the overflow material comprises: In 150-300 ppm, Fe2O3 20%-22%, ZnO 47%-49%, SiO2 3%-5%, CaO 2%-3%, TiO2 2%-3%, Cl 2%-3%, and SnO2 0.6%-0.7%. The extraction agent for the centrifugal extraction comprises: P20413-15%， N2358-15%， Cyanex 272 25-35%, and the rest is sulfonated kerosene diluent. The iron-making sludge is vanadium-titanium magnetite blast furnace gas sludge, and the composition comprises, in terms of mass content:

2. The method of claim 1, wherein, In 49-82 ppm, Fe2O3 39.1-54.5%, C 11.8-14.4%, ZnO 9.15-13.1%, SiO2 3.9-7.81%, CaO 4.7-6.28%, TiO2 4.2-4.98%, Cl 3.5-4.10%, and SnO2 0.29-0.34%.

3. The method of claim 1, wherein, The mass concentration of the slurry is 17%-23%.

4. The method of claim 1, wherein, Step 2 further comprises: the tailings are returned to an iron ore sintering process for recycling.

5. The method of claim 1, wherein, Step 3 further comprises: the iron-rich slag is subjected to magnetic separation to obtain a reduced iron powder product.

6. The method of claim 1, wherein, In step 4, the liquid-solid ratio of the acid leaching is 4.5:1-6:1 in terms of mass ratio, the leaching temperature is 50-85 DEG C, and the acid leaching is carried out using sulfuric acid with a concentration of 200-300 g / L.

7. The method of claim 1, wherein, In step 5, the back extraction agent is pure water or a 20-50 g / L sodium hydroxide solution.

8. The method of claim 1, wherein, In step 6, the cathode used in the electrolytic treatment is a TA1 plate or a TA2 plate, and the anode is an indium plate.

9. An InSnZn liquid metal alloy, characterized by, In the InSnZn liquid metal alloy, in terms of mass percentage, In is 60%-85%, Sn is 8%-20%, and Zn is 4%-20%. In terms of mass percentage, In is 60%-85%, Sn is 8%-20%, and Zn is 4%-20%, and the melting point is 110-130 DEG C.

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