A device and method for enriching iron components from converter steel slag and nickel slag / copper slag

Abstract

The application introduces a device and method for enriching iron components in converter steel slag cooperated with nickel slag / copper slag, wherein the device for enriching iron components comprises a ladle car, a ladle, an electrode and a furnace cover; the ladle is placed on the ladle car, the furnace cover is placed on the top of the ladle, the bottom working layer of the ladle is lined with a gas-permeable brick, the gas-permeable brick is in communication with an external air pipe, the electrode can pass through the furnace cover and be immersed into molten slag. Based on the above device, the application also designs a use method of the device for enriching iron components in converter steel slag cooperated with nickel slag / copper slag, which realizes online enrichment of iron components and reconstruction of non-iron components in the rich-iron nickel slag / copper slag and converter steel slag by placing the molten rich-iron nickel slag / copper slag and converter steel slag in the ladle for mixing and heating. The use method of the above device for enriching iron components is suitable for industrial production and also gets rid of the high dependence on quicklime CaO in the existing method.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of metallurgy, and particularly relates to a device and method for enriching iron components from converter steel slag in cooperation with nickel slag / copper slag. BACKGROUND

[0002] Iron-rich nickel slag / copper slag is a typical acid slag, and the main occurrence form of iron is fayalite Fe2SiO4. The kinetic rate of Fe2SiO4 directly converting into magnetite Fe3O4 or elemental iron Fe is slow. Therefore, the main idea of iron component enrichment and recovery is to add an alkaline modifier such as quicklime CaO to the slag, and then enrich Fe2SiO4 into Fe3O4 in an oxidizing atmosphere, or enrich Fe2SiO4 into Fe element through a reducing agent, and finally recover the enriched iron components through magnetic separation.

[0003] Chinese patent CN104988302A discloses a method for efficiently recovering iron resources from nickel slag, which is to modify the molten iron-rich nickel slag with quicklime or limestone, and then perform oxidation treatment. After the oxidized nickel slag is water-quenched and cooled, it is crushed and magnetically separated to obtain magnetite.

[0004] Chinese patent CN201910708193 discloses a method for modifying and extracting iron from molten copper slag and preparing ceramics from the tail slag thereof, which is to add 0.1-10% of Na2CO3, N2O or other alkali metal oxide modifiers to molten copper slag at 1500°C, and at the same time, spray a small amount of air to form magnetite. After the oxidized copper slag is cooled under certain conditions, it is crushed and magnetically separated to obtain iron powder.

[0005] The above methods have achieved efficient recovery of iron resources from iron-rich nickel slag and iron-rich copper slag, respectively, and have high economic and social benefits. However, they all need to add alkali metal oxides to promote the rapid migration of Fe2SiO4 in iron-rich nickel slag / copper slag to Fe3O4 in an oxidizing atmosphere. Compared with each other, Na2CO3, N2O and other alkali metal oxides are expensive, and their cost performance is not high for industrial use. Quicklime CaO is the most inexpensive alkali metal oxide, but industrial quicklime CaO also needs to be prepared by calcining limestone in a rotary kiln at high temperature. China is one of the countries with abundant limestone resources in the world, but since limestone is a non-renewable natural mineral and is widely used in many fields such as construction, metallurgy, chemical industry, papermaking and coating, it is necessary to seek alternative alkaline modifiers for green metallurgy.

[0006] In addition, the prior art is all laboratory research results, taking CaO as the alkaline modifier and taking the muffle furnace in the laboratory as the heat source, the mixture is reheated to the temperature of the iron-nickel-rich slag / copper slag or even higher temperature in the muffle furnace, and then the temperature is kept and the process of oxidation / reduction and other iron component enrichment is carried out. The industrialization conversion and application of these research results are affected to some extent due to the disconnection between the process and equipment of industrial production. The temperature of the molten iron-nickel-rich slag / copper slag produced in industry is in the range of 1200-1450℃, and the addition of alkaline modifier or long-time oxidation / reduction treatment will cause temperature drop, which is easy to reduce the temperature of the molten slag to below the melting point, thereby solidifying. Therefore, the industrialized disposal of iron-nickel-rich slag / copper slag must have a specific device to provide continuous and stable heat to complete the oxidation / reduction process of the iron component in the slag, so as to realize the effective enrichment of the iron component. SUMMARY

[0007] In view of the high dependence on quicklime CaO in the existing method of enriching and recovering iron components from nickel slag / copper slag, and the problem that the existing iron component enrichment equipment is all laboratory products and is seriously disconnected with industrial production, the present application proposes a device and method for enriching iron components from converter steel slag and nickel slag / copper slag, so as to realize industrial production and get rid of the high dependence on quicklime CaO.

[0008] A device for enriching iron components from converter steel slag and nickel slag / copper slag, comprising a ladle car, a ladle, an electrode and a furnace cover;

[0009] The ladle is placed on the ladle car;

[0010] The furnace cover is placed on the top of the ladle;

[0011] The bottom working layer of the ladle is lined with a gas-permeable brick;

[0012] The gas-permeable brick is in communication with the external air pipe;

[0013] The electrode passes through the furnace cover and is immersed in the molten slag in the ladle.

[0014] Preferably, the furnace cover comprises a ladle cover and an LF furnace cover;

[0015] The middle part of the LF furnace cover is provided with a hole to allow the electrode to pass through.

[0016] Preferably, the outer wall of the ladle is symmetrically provided with trunnions on the upper part;

[0017] The outer wall of the LF ladle furnace is provided with a ladle body small hook on one side of the bottom;

[0018] A method for using a device for enriching iron components from converter steel slag and nickel slag / copper slag, comprising the following steps:

[0019] Step S1, the molten state of the industrial production of rich iron nickel slag / copper slag is discharged to the ladle, and then the ladle cover is added to reduce the temperature drop of the molten slag during transportation;

[0020] Step S2, after the ladle containing the molten state of the rich iron nickel slag / copper slag is stabilized on the ladle car, it is smoothly transported and accurately parked at the LF furnace station;

[0021] Step S3, connect the external gas pipe joint with the air brick at the bottom of the ladle, and input a certain flow and pressure of oxygen;

[0022] Step S4, use the crane to lift the ladle cover, and use the crane to lift the slag bucket containing the granular converter slag to the LF furnace station;

[0023] Step S5, lift the crane hook, and pour the granular converter slag in the slag bucket into the ladle containing the molten state of the rich iron nickel slag / copper slag at a uniform speed;

[0024] Step S6, after the pouring of the converter slag is completed, use the crane to control the slag bucket to quickly leave the LF furnace station;

[0025] Step S7, cover the LF furnace cover, lower the electrode to a certain depth immersed in the mixed slag composed of the molten state of the rich iron nickel slag / copper slag and the granular converter slag, generate an electric arc by electrifying the electrode, heat the mixed slag and keep it for a certain time to obtain oxidized slag;

[0026] Step S8, sequentially complete the electrode power-off, lifting and rotation, lift the LF furnace cover, stop the input of oxygen, disconnect the external gas pipe and the air brick, and use the crane to smoothly lift the ladle to the designated position for air cooling;

[0027] Step S9, crush the cooled oxidized slag to a certain particle size, and perform magnetic separation in a magnetic separator with a certain magnetic field strength; the magnetic part obtained by magnetic separation is magnetite, and the non-magnetic part is silicate tailings.

[0028] Preferably, in step S1, the liquid level of the molten state of the rich iron nickel slag / copper slag in the ladle is not more than 60%±10% of the height of the ladle;

[0029] Preferably, in steps S3-S7, the oxygen is always in a delivery state, the flow rate of the input oxygen is 200-1000 L / min, and the pressure of the oxygen is 0.3-1.0 MPa.

[0030] Preferably, the particle size of the converter slag is less than 12 mm.

[0031] Preferably, in step S6, the liquid level after pouring the converter slag is not less than 300 mm±100 mm from the slag line of the ladle.

[0032] Preferably, in the step S7, the depth of the electrode immersed in the molten iron-rich nickel slag / copper slag is 20 cm ± 5 cm.

[0033] Preferably, in the step S7, the temperature of the electric arc heating is 1350℃-1550℃.

[0034] Preferably, in the step S7, the holding time is 1.5h-2h.

[0035] Preferably, in the step S8, the air cooling can also be replaced by water quenching.

[0036] Preferably, in the step S9, the particle size of the oxidized slag is less than 200 mesh.

[0037] Preferably, in the step S9, the magnetic field strength is less than 200mT.

[0038] The beneficial effects obtained by the present application are:

[0039] 1. The device designed by the present application for enriching iron components from converter slag and nickel slag / copper slag, which transports the industrial output iron-rich nickel slag / copper slag to the LF furnace working position by a ladle car, pours granular converter slag into the ladle, and uses electrodes to heat the mixed slag formed by the iron-rich nickel slag / copper slag and the converter slag, and uses oxygen introduced through the air brick at the bottom of the ladle to oxidize the mixed slag, so as to realize the industrial enrichment of iron components.

[0040] 2. The present application no longer uses the method of mixing CaO, a basic modifier, with iron-rich nickel slag / copper slag, and then heating and oxidizing / reducing to realize the enrichment of iron components in the iron-rich nickel slag / copper slag, but proposes to replace quicklime CaO with converter slag rich in free CaO, and add it to the ladle containing molten iron-rich nickel slag / copper slag, and under the heating and temperature control of the LF furnace electrodes, realize the enrichment of iron components and the reconstruction of non-iron components in the iron-rich nickel slag / copper slag and the converter slag after oxygen oxidation.

[0041] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the contents of the specification can be implemented, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following will be described in detail with the preferred embodiments of the present application and with the help of the accompanying drawings.

[0042] According to the detailed description of the specific embodiments of the present application in the following text combined with the accompanying drawings, those skilled in the art will more clearly understand the above and other purposes, advantages and features of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual proportion.

[0044] Figure 1 A front view of the device for enriching iron components of converter steel slag cooperated with nickel slag / copper slag in transportation provided by the present application;

[0045] Figure 2 A side view of the device for enriching iron components of converter steel slag cooperated with nickel slag / copper slag in transportation provided by the present application;

[0046] Figure 3 A top view of the device for enriching iron components of converter steel slag cooperated with nickel slag / copper slag in transportation provided by the present application;

[0047] Figure 4 A front view of the device for enriching iron components of converter steel slag cooperated with nickel slag / copper slag in heating provided by the present application;

[0048] Figure 5 A side view of the device for enriching iron components of converter steel slag cooperated with nickel slag / copper slag in heating provided by the present application;

[0049] Figure 6 A top view of the device for enriching iron components of converter steel slag cooperated with nickel slag / copper slag in heating provided by the present application;

[0050] Figure 7 A flow chart of the method for using the device for enriching iron components of converter steel slag cooperated with nickel slag / copper slag provided by the present application;

[0051] Figure 8 The XRD pattern of the converter steel slag cooperated with iron-rich nickel slag after oxidation provided by the embodiments 3-5;

[0052] Figure 9 The XRD pattern of the converter steel slag cooperated with iron-rich copper slag after oxidation provided by the embodiments 6-7;

[0053] The drawings are as follows: 1, ladle car; 2, ladle; 3, air brick; 4, external air pipe; 5, ladle cover; 6, LF furnace cover; 7, electrode; 8, trunnion; 9, small hook of ladle body; 10, bottom working layer; 11, molten iron-rich nickel slag / copper slag; 12, electric arc; 13, oxygen; 14, converter steel slag; 15, slag hopper; 16, magnetite; 17, silicate tailings. DETAILED DESCRIPTION

[0054] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the drawings in the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. In the following description, specific details such as specific configurations and components are provided only to help a comprehensive understanding of the embodiments of the present application. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, descriptions of known functions and structures are omitted in the embodiments for clarity and conciseness.

[0055] It should be understood that the term “one embodiment” or “the embodiment” mentioned throughout the specification means that a specific feature, structure or property related to the embodiment is included in at least one embodiment of the present application. Therefore, “one embodiment” or “the embodiment” appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or properties can be combined in one or more embodiments in any suitable manner.

[0056] In addition, reference numerals and / or letters can be repeated in different examples in the present application. Such repetition is for the purpose of simplification and clarity, and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0057] The term “and / or” herein is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that there are three cases of A alone, B alone and A and B together. The term “ / and” herein is a description of another association relationship of the associated objects, which means that there can be two relationships, for example, A / and B can mean that there are two cases of A alone and A and B together. In addition, the character “ / ” herein generally means that the associated objects before and after are in an “or” relationship.

[0058] The term “at least one” herein is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, at least one of A and B can mean that there are three cases of A alone, A and B together, and B alone.

[0059] It should also be noted that the relationship terms such as first and second in the present document are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms “include”, “contain” or any other variants thereof are intended to cover non-exclusive inclusion.

[0060] Embodiment 1

[0061] The embodiment mainly introduces a simple design of a device for enriching iron components from converter slag and nickel slag / copper slag, which comprises a ladle car 1, a ladle 2, an electrode 7 and a furnace cover;

[0062] The ladle 2 is placed on the ladle car 1;

[0063] The furnace cover is placed on the top of the ladle 2;

[0064] The bottom working layer 10 of the ladle 2 is lined with a gas-permeable brick 3;

[0065] The gas-permeable brick 3 is in communication with an external air pipe 4;

[0066] The electrode 7 penetrates the furnace cover and is immersed in the molten slag in the ladle 2.

[0067] The oxygen 13 blown in through the external air pipe 4 enters the molten iron-rich nickel slag / copper slag 11 and plays an oxidizing and convection stirring role in the upward movement;

[0068] The ladle 2 is used to contain the molten iron-rich nickel slag / copper slag 11 and the subsequent converter slag 14.

[0069] Further, the gas-permeable brick 3 is an industrial gas-permeable brick; its size is selected according to the capacity of the ladle 2; the gas-permeable brick 3 is located on an axis perpendicular to the connecting line of the trunnion 8 and away from the ladle body small hook 9, and the distance d from the center of the ladle 2 is 0.3R, where R is the radius of the inner cavity bottom surface.

[0070] Further, the furnace cover comprises a ladle cover 5 and an LF furnace cover 6;

[0071] The ladle cover 5 is used for heat preservation when the molten iron-rich nickel slag / copper slag 11 in the ladle 2 is transported from the slag discharge position to the LF furnace;

[0072] The LF furnace cover 6 is used for heat preservation after the molten iron-rich nickel slag / copper slag 11 and the converter slag 14 in the ladle 2 are heated by the electrode 7;

[0073] Further, the ladle cover 5 can be adjusted at an angle of 0°-45° in the vertical direction; the LF furnace cover 6 can be adjusted at an angle of 0°-45° in the vertical direction; the electrode 7 can be rotated by ±90° in the horizontal direction with the ladle 2 station as the center; the electrode 7 is an industrial carbon electrode, the current used is alternating current, and the voltage is 380V; the oxygen 13 is self-made by an air compression station.

[0074] When the ladle cover 5 is used to cover the ladle 2, please refer to Figures 1-3 When the LF furnace cover 6 is used to cover the ladle 2, please refer to Figures 4-6 .

[0075] The middle part of the LF furnace cover 6 is provided with a hole allowing the electrode 7 to pass through; the electrode 7 is a rotatable telescopic electrode, and the rotating electrode is used to adjust the electrode position.

[0076] Further, the outer wall of the ladle 2 is symmetrically provided with trunnions 8 at the upper part;

[0077] The outer wall of the ladle 2 is provided with a ladle body small hook 9 at one side of the bottom.

[0078] The application provides a device for enriching iron components from converter steel slag and nickel slag / copper slag, which comprises the following steps:

[0079] Embodiment 2

[0080] Based on embodiment 1, the application mainly introduces a use method of the device for enriching iron components from converter steel slag and nickel slag / copper slag, which comprises the following steps:

[0081] Step S1, the molten iron-rich nickel slag / copper slag 11 produced industrially is discharged into the ladle 2, and then the ladle cover 5 is added to reduce the temperature drop of the molten slag during the transportation process;

[0082] Step S2, after the ladle 2 containing the molten iron-rich nickel slag / copper slag 11 is stabilized on the ladle car 1, the ladle car 1 is stably transported and accurately parked at the LF furnace working position;

[0083] Step S3, the external air pipe 4 joint is connected with the air brick 3 at the bottom of the ladle 2, and a certain flow and pressure of oxygen 13 is introduced;

[0084] Step S4, the ladle cover 5 is lifted away by the crane within 1 min±30 s, and the slag bucket 15 containing the converter steel slag 14 is lifted to the ladle 2 by the crane;

[0085] Step S5, the converter steel slag 14 in the slag bucket 15 is poured into the ladle 2 containing the molten iron-rich nickel slag / copper slag 11 at a uniform speed within 2 min±30 s by lifting the crane hook;

[0086] Step S6, after the pouring is completed, the slag bucket 15 is controlled to return to the normal position within 30 s to 60 s by the crane, and then quickly leaves the LF furnace working position;

[0087] Step S7, the LF furnace cover 6 is covered, the electrode 7 is inserted into the LF ladle furnace 2 within 2 min±30 s, and then the electric arc 12 is heated by electricity, and then a heat preservation treatment is performed; the Fe components in the mixed slag can be fully oxidized within 1.5 h to 2 h;

[0088] Step S8, after the end of the mixed slag oxidation, the electrode 7 is turned off, lifted and rotated within 2 min ± 30 s, and the LF furnace cover 6 is lifted;

[0089] Step S9, after the end of the mixed slag oxidation, air cooling is carried out, the cooled oxidation slag is broken to a certain particle size, and magnetic separation is carried out in a magnetic separator with a certain magnetic field strength; the selected magnetic part is magnetite 16, and the non-magnetic part is silicate tailings 17.

[0090] Further, in the step S1, during the tapping of the iron-nickel-rich slag / copper slag 11, the liquid level of the molten iron-nickel-rich slag / copper slag 11 in the ladle 2 is not more than 60% ± 10% of the height of the ladle 2; the ladle cover 5 is in a preheated state.

[0091] Further, in the step S2, the transportation of the ladle 2 to the LF furnace station can be by rail transportation or by crane hoisting; the weight of the iron-nickel-rich slag / copper slag 11 can be calculated by weighing the ladle 2 with the crane: the weight of the iron-nickel-rich slag / copper slag 11 = the weight of the ladle 2 after pouring the iron-nickel-rich slag / copper slag 11 - the weight of the ladle 2.

[0092] Further, the flow of the oxygen 13 can be adjusted, and the oxygen flow can be appropriately adjusted according to different processing stages, processing methods and processing purposes before, during and after oxidation.

[0093] Further, in the step S5, the slag pot 15 is strictly prohibited from overflowing with molten iron-nickel-rich slag / copper slag 11 during the process of pouring the converter slag 14.

[0094] Further, in the step S5, when the converter slag 14 is poured into the ladle 2 containing molten iron-nickel-rich slag / copper slag 11, the flow of oxygen 13 is appropriately increased to accelerate the melting speed of the converter slag 14, so that the composition of the molten slag in the ladle 2 is uniform; if the ladle 2 used is a special ladle (new ladle, repaired ladle, small repair, cold ladle, etc.), the flow of oxygen 13 must be appropriately increased; the flow of oxygen 13 can be appropriately reduced during the period from the completion of the mixed slag oxidation to the ladle lifting; the oxygen supply mode is not limited to the bottom gas permeable brick of the ladle, and the oxygen lance provided by the LF furnace can be used for oxygen supply when necessary;

[0095] Further, in the steps S3-S7, the oxygen 13 is always in a delivery state, the flow rate of the oxygen 13 is 200-1000 L / min, and the pressure of the oxygen 13 is 0.3-1.0 MPa.

[0096] Further, in the step S6, the liquid level after pouring the converter slag 14 is not less than 300 mm ± 100 mm from the slag line.

[0097] Further, in the step S7, the depth of the electrode 7 immersed in the ladle 2 is 20 cm ± 5 cm.

[0098] Further, in the step S7, the temperature heated by the electric arc 12 is 1350℃-1550℃.

[0099] Further, the particle size of the converter slag 14 is less than 12 mm.

[0100] Further, in the step S9, the air cooling can be replaced by water quenching.

[0101] Further, the magnetite obtained in the step S9 can be used for steel smelting or preparation of functional materials such as wave-absorbing materials, sewage treatment agents, etc.; and the silicate obtained can be used as a raw material for preparation of inorganic non-metallic materials such as microcrystalline glass, ceramics, etc.

[0102] Instead of the prior method of mixing the basic modifier CaO with the iron-nickel-rich slag / copper slag, heating, and oxidizing / reducing to realize enrichment of iron components in the iron-nickel-rich slag / copper slag, the present application replaces the quicklime CaO with the converter slag rich in free CaO, and adds it into the ladle containing the molten iron-nickel-rich slag / copper slag, under the heating and temperature control of the LF furnace electrode, and realizes simultaneous enrichment of iron components and reconstruction of non-iron components in the iron-nickel-rich slag / copper slag and the converter slag through oxygen oxidation.

[0103] Embodiment 3

[0104] Based on the above embodiments 1-2, the present embodiment mainly introduces a first optimization of the use method of the device for online enrichment of iron components by converter slag in cooperation with iron-nickel-rich slag.

[0105] Step S1, first, about 30 tons of 1350℃ molten iron-nickel-rich slag is discharged into the ladle 2 on the ladle car 1, and then the ladle 2 is smoothly transported to the LF furnace station after being covered with the ladle cover 5;

[0106] Step S2, oxygen 13 with a flow rate of 600 L / min and a pressure of 0.6 MPa is introduced into the molten iron-nickel-rich slag through the air brick 3 connected by the external air pipe 4; after the ladle cover 5 is lifted by the crown block, about 10 tons of converter slag 14 with a particle size of ≤10 mm is uniformly poured into the ladle 2 containing the molten iron-nickel-rich slag by the slag bucket 15;

[0107] Step S3, the ladle 2 is covered with the LF furnace cover 6, the electrode 7 is rotated and lowered to be immersed in the melt about 20 cm, and then electricity is supplied, so that the mixed slag in the ladle 2 is heated to 1550℃ by the electric arc; after 2 h of heat preservation, the Fe components in the mixed slag are fully oxidized by the continuously supplied oxygen 13;

[0108] Step S4, after the end of the mixed slag oxidation, the electrode 7 is powered off, lifted and rotated, the LF furnace cover 6 is lifted, and finally the oxidized slag in the ladle 2 is water quenched to obtain the cold oxidized slag.

[0109] After the cold oxidized slag is crushed to a particle size of 74 μm, phase analysis is performed, and the results are shown in Table 2. Figure 8 As shown in Table 2, it can be seen that magnetite (Fe3O4) has become the main iron-containing phase in the oxidized slag, and the non-iron components Ca, Mg and Si are mainly restructured into pyroxene phase (Ca(Mg, Fe)Si2O6 and Ca(Mg, Al)(Si, Al)2O6). Among them, magnetite is a magnetic mineral, and pyroxene is a non-magnetic mineral, so they can be separated by conventional crushing and magnetic separation. Magnetite can be used for steel smelting or preparation of functional materials (such as wave-absorbing materials, sewage treatment agents, etc.), and the pyroxene phase can be used as a raw material for preparing microcrystalline glass, ceramic and other inorganic non-metallic materials.

[0110] Example 4

[0111] Based on the above examples 1-2, this example mainly introduces a second optimization of the use method of the device for on-line enrichment of iron components in converter steel slag cooperated with iron-nickel-rich slag.

[0112] Step S1, first, about 30 tons of 1300℃ molten iron-nickel-rich slag is poured into the ladle 2 on the ladle car 1, and then the ladle 2 is smoothly transported to the LF furnace station after the ladle cover 5 is added;

[0113] Step S2, oxygen 13 with a flow rate of 700 L / min and a pressure of 0.7 MPa is introduced into the molten iron-nickel-rich slag through the air brick 3 connected by the external oxygen pipe 4; after the ladle cover 5 is lifted by the crown block, about 8 tons of converter steel slag 14 with a particle size of ≤7 mm is uniformly poured into the ladle 2 containing the molten iron-nickel-rich slag by the slag bucket 15;

[0114] Step S3, the ladle 2 is covered with the LF furnace cover 6, the electrode 7 is rotated and lowered to be immersed in the melt about 20 cm, and then powered on to generate an electric arc to heat the mixed slag in the ladle 2 to 1450℃; after 2h of insulation, the Fe components in the mixed slag are fully oxidized by the continuously introduced oxygen 13;

[0115] Step S4, after the end of the mixed slag oxidation, the electrode 7 is powered off, lifted and rotated, the LF furnace cover 6 is lifted, and finally the oxidized slag in the ladle 2 is water quenched to obtain the cold oxidized slag.

[0116] After the cold oxidized slag is crushed to a particle size of 74 μm, phase analysis is performed, and the results are shown in Table 2. Figure 8As shown in FIG. 2, it can be seen that magnetite (Fe3O4) has become the main iron-containing phase in the oxidized slag, while the non-iron components Ca, Mg and Si are mainly restructured into pyroxene phase (Ca(Mg, Fe)Si2O6 and Ca(Mg, Al)(Si, Al)2O6). Among them, magnetite is a magnetic mineral, while pyroxene is a non-magnetic mineral, so they can be separated by conventional crushing and magnetic separation. Magnetite can be used for steel smelting or preparation of functional materials (such as wave-absorbing materials, sewage treatment agents, etc.), while the pyroxene phase can be used as a raw material for preparing microcrystalline glass, ceramics and other inorganic non-metallic materials.

[0117] Example 5

[0118] Based on the above Examples 1-2, this example mainly introduces a third optimization of the use method of the device for on-line enrichment of iron components in converter steel slag cooperated with iron and nickel-rich slag.

[0119] Step S1, first pour about 30 tons of 1250℃ molten iron and nickel-rich slag into ladle 2 sitting on ladle car 1, then smoothly transport ladle 2 to the LF furnace station after covering it with ladle cover 5;

[0120] Step S2, pass oxygen 13 with a flow rate of 800L / min and a pressure of 0.8MPa through air brick 3 connected by external air pipe 4 into the molten iron and nickel-rich slag; after lifting ladle cover 5 with a crane, pour 6 tons of converter steel slag 14 with a particle size of ≤5mm into ladle 2 containing molten iron and nickel-rich slag at a constant speed with slag bucket 15;

[0121] Step S3, cover ladle 2 with LF furnace cover 6, rotate and lower electrode 7 to immerse it in the melt about 20cm, then pass electricity to generate electric arc to heat the mixed slag in ladle 2 to 1350℃; after 2h of heat preservation, make Fe components in the mixed slag be fully oxidized by continuously passed oxygen 13;

[0122] Step S4, after the oxidation of the mixed slag is completed, stop the power supply of electrode 7, lift and rotate it, then lift LF furnace cover 6, and finally water quench the oxidized slag in ladle 2 to obtain cold-state oxidized slag.

[0123] After the cold-state oxidized slag is crushed to a particle size of 74μm, phase analysis is performed, and the results are shown in FIG. 2. Figure 8 As shown in FIG. 2, it can be seen that magnetite (Fe3O4) has become the main iron-containing phase in the oxidized slag, while the non-iron components Ca, Mg and Si are mainly restructured into pyroxene phase (Ca(Mg, Fe)Si2O6 and Ca(Mg, Al)(Si, Al)2O6). Among them, magnetite is a magnetic mineral, while pyroxene is a non-magnetic mineral, so they can be separated by conventional crushing and magnetic separation. Magnetite can be used for steel smelting or preparation of functional materials (such as wave-absorbing materials, sewage treatment agents, etc.), while the pyroxene phase can be used as a raw material for preparing microcrystalline glass, ceramics and other inorganic non-metallic materials.

[0124] Example 6

[0125] Based on the above examples 1-2, this example mainly introduces a first optimization of the use method of the device for on-line enrichment of iron components by converter steel slag cooperated with iron-rich copper slag.

[0126] Step S1, first, about 30 tons of 1400℃ molten iron-rich copper slag is poured into ladle 2 sitting on ladle car 1, and then the ladle 2 is smoothly transported to the LF furnace station after being covered with ladle cover 5;

[0127] Step S2, oxygen 13 with a flow rate of 700 L / min and a pressure of 0.7 MPa is passed into the molten iron-rich copper slag through the air brick 3 connected by the external oxygen pipe 4; after the ladle cover 5 is lifted by the crown block, about 8.5 tons of converter steel slag 14 with a particle size of ≤7 mm is uniformly poured into the ladle 2 containing the molten iron-rich copper slag by the ladle 15;

[0128] Step S3, the ladle 2 is covered with the LF furnace cover 6, the electrode 7 is rotated and lowered to be immersed in the melt about 20 cm, and then power is supplied to generate an electric arc to heat the mixed slag in the ladle 2 to 1450℃; after 2h of heat preservation, the Fe components in the mixed slag are fully oxidized by the continuously supplied oxygen 13;

[0129] Step S4, after the oxidation of the mixed slag is completed, the electrode 7 is powered off, lifted and rotated, the LF furnace cover 6 is further lifted, and finally the oxidized slag in the ladle 2 is water quenched to obtain cold oxidized slag.

[0130] After the cold oxidized slag is crushed to a particle size of -74μm, phase analysis is performed, and the results are shown in Table 1: Figure 9 As can be seen from Table 1, magnetite (Fe3O4) has become the main iron-containing phase in the oxidized slag, and non-iron components Ca, Mg and Si are mainly restructured into pyroxene phase (Ca(Mg,Fe)Si2O6 and Ca(Mg,Al)(Si,Al)2O6). Among them, magnetite is a magnetic mineral, while pyroxene is a non-magnetic mineral, so they can be separated by conventional crushing and magnetic separation. Magnetite can be used for steel smelting or preparation of functional materials (such as wave-absorbing materials, sewage treatment agents, etc.), while pyroxene phase can be used as raw material for preparation of microcrystalline glass, ceramic and other inorganic non-metallic materials.

[0131] Example 7

[0132] Based on the above examples 1-2, this example mainly introduces a second optimization of the use method of the device for on-line enrichment of iron components by converter steel slag cooperated with iron-rich copper slag.

[0133] Step S1, first, about 30 tons of 1350℃ molten iron-rich copper slag is poured into ladle 2 sitting on ladle car 1, and then the ladle 2 is smoothly transported to the LF furnace station after being covered with ladle cover 5;

[0134] Step S2, the oxygen 13 with flow rate 600L / min and pressure 0.6MPa is passed into the molten iron-rich copper slag through the gas permeable brick 3 connected with the external air pipe 4; after the ladle cover 5 is lifted by the crown block, the converter slag 14 with particle size ≤10mm and total amount 6.5 tons is uniformly poured into the ladle 2 containing the molten iron-rich copper slag by the slag bucket 15;

[0135] Step S3, the ladle 2 is covered with the LF furnace cover 6, the electrode 7 is rotated and lowered to be immersed in the melt about 20cm, and then power is supplied, so that the mixed slag in the ladle 2 is heated to 1400℃ by the electric arc; after 2h of heat preservation, the Fe component in the mixed slag is fully oxidized by the continuously supplied oxygen 13;

[0136] Step S4, after the oxidation of the mixed slag is completed, the electrode 7 is powered off, lifted and rotated, the LF furnace cover 6 is further lifted, and finally the oxidized slag in the ladle 2 is water quenched, so that the cold-state oxidized slag is obtained.

[0137] After the cold-state oxidized slag is crushed to a particle size of-74μm, phase analysis is performed, and the results are shown in Table 1: Figure 9 As can be seen from Table 1, magnetite (Fe3O4) has become the main iron-containing phase in the oxidized slag, and the non-iron components Ca, Mg and Si are mainly restructured into pyroxene phases (Ca(Mg,Fe)Si2O6 and Ca(Mg,Al)(Si,Al)2O6). Among them, magnetite is a magnetic mineral, and pyroxene is a non-magnetic mineral, so they can be separated by conventional crushing and magnetic separation. The magnetite can be used for steel smelting or preparation of functional materials (such as wave-absorbing materials, sewage treatment agents, etc.), and the pyroxene phase can be used as a raw material for preparing microcrystalline glass, ceramic and other inorganic non-metallic materials.

[0138] The above only describes the preferred embodiments of the present application, and does not limit the protection scope of the present application. For those skilled in the art, the present application can have various changes and modifications. Any changes, modifications, replacements, integrations and parameter changes made to these embodiments within the spirit and principles of the present application, which can realize the same functions without departing from the principles and spirit of the present application, fall within the protection scope of the present application.

Claims

1. A method of using a device for enriching iron components from converter steel slag in cooperation with nickel slag or copper slag, characterized by, The method comprises the following steps: Step S1, the molten iron-nickel-rich slag or copper slag produced by industry is discharged into a ladle, and then a ladle cover is added to reduce the temperature drop of the molten slag during transportation; Step S2, after the ladle containing the molten iron-nickel-rich slag or copper slag is stabilized on the ladle car, the ladle car is smoothly transported and accurately parked at the LF furnace station; Step S3, an external air pipe joint is connected to the air brick at the bottom of the ladle, and oxygen gas with a flow rate of 200-1000 L / min and a pressure of 0.3-1.0 MPa is introduced; Step S4, the ladle cover is lifted by a crane, and a slag bucket containing converter slag with a particle size of less than 12 mm is lifted by the crane to the LF furnace station; Step S5, the auxiliary hook of the crane is lifted, and the granular converter slag in the slag bucket is poured into the ladle containing the molten iron-nickel-rich slag or copper slag at a uniform speed; Step S6, after the pouring of the converter slag is completed, the slag bucket is quickly moved away from the LF furnace station by the crane; Step S7, the LF furnace cover is added, the electrode is lowered to a depth of 20 cm±5 cm in the mixed slag composed of the molten iron-nickel-rich slag or copper slag and the granular converter slag, the electrode is powered to generate an electric arc, the mixed slag is heated and then kept for 1.5-2 h, and oxidized slag is obtained; Step S8, the electrode is sequentially powered off, lifted and rotated, the LF furnace cover is lifted, the oxygen gas is stopped, the external air pipe is disconnected from the air brick, and the ladle is smoothly lifted by the crane to a designated position for air cooling; Step S9, the cooled oxidized slag is crushed to a certain particle size, and is subjected to magnetic separation in a magnetic separator with a magnetic field strength of less than 200 mT; the magnetic part obtained by the magnetic separation is magnetite, and the non-magnetic part is silicate tailings. In steps S3-S7, the oxygen is always in a delivery state; The device comprises a ladle car, a ladle, an electrode and a furnace cover; the ladle is placed on the ladle car; the furnace cover is placed on the top of the ladle; an industrial air brick is built in the bottom working layer of the ladle, and the air brick is in communication with an external air pipe; the electrode is a rotatable and telescopic electrode, which penetrates through the furnace cover and is immersed in the molten slag in the ladle.

2. A method of using the device for enriching iron components from converter steel slag in conjunction with nickel slag or copper slag according to claim 1, characterized in that, The furnace cover comprises a ladle cover and an LF furnace cover; A hole is arranged in the middle of the LF furnace cover to allow the electrode to pass through.

3. A method of using the device for enriching iron components from converter steel slag in conjunction with nickel slag or copper slag according to claim 2, characterized in that, Ears are symmetrically arranged on the upper part of the outer wall of the ladle; A small hook is arranged on one side of the bottom of the outer wall of the ladle.

4. A method of using the device for enriching iron components from converter steel slag in conjunction with nickel slag or copper slag according to claim 3, characterized in that, In step S1, the liquid level of the molten iron-nickel-rich slag or copper slag in the ladle is not higher than 70% of the height of the ladle.

5. A method of using an apparatus for the enrichment of the iron component from converter steel slags, in combination with nickel slags or copper slags, according to any one of claims 3 or 4, characterized in that, In step S6, the liquid level after the converter slag is poured is not less than 200 mm from the slag line of the ladle. In step S7, the temperature of the electric arc heating is 1350-1550°C.

6. A method of using an apparatus for the enrichment of the iron component from converter steel slags, in co-processing with nickel slags or copper slags, according to any one of claims 3 or 4, characterized in that, In step S8, the air cooling is replaced by water quenching.

7. A method of using the device for enriching iron components from converter steel slag in conjunction with nickel slag or copper slag according to claim 3, characterized in that, In step S9, the particle size of the oxidized slag is less than 200 mesh.

8. A method of using the device for enriching iron components from converter steel slag in conjunction with nickel slag or copper slag according to claim 3, characterized in that, ​

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