Sintered ore electrolysis iron manufacturing device

Abstract

The utility model discloses a device for manufacturing iron by electrolyzing sintered ore. The device comprises an electrolysis unit, a feeding unit, a gas collecting unit and a slag iron discharging unit which are sequentially continuous, the anode and the cathode are connected with the power supply, the cathode is located at the bottom of an inner cavity of the electrolytic cell, and the anode is located at the upper part of the inner cavity of the electrolytic cell; the feeding unit is connected to a feeding port in the top of the electrolytic cell. Raw material sinter enters the electrolytic cell from the feeding port. The gas collecting unit comprises an oxygen outlet connected to the upper part of the electrolytic cell, and oxygen generated by electrolysis is accumulated on the upper part of the electrolytic cell and enters the pipe network through the oxygen outlet; the slag iron discharge unit comprises an iron liquid discharge port and a molten slag discharge port, the iron liquid discharge port is located at the bottom of the electrolytic bath and used for discharging molten iron at the bottom of the electrolytic bath, and an outlet of the iron liquid discharge port is connected with an iron ladle; the slag discharge port is located in the middle of the electrolytic cell and used for discharging molten slag on the upper portion of the electrolytic cell, and an outlet of the slag discharge port is connected with a slag ladle.

Description

Technical Field

[0001] This utility model belongs to the field of electrochemical metallurgical technology, specifically relating to a device for producing iron from sintered ore by electrolysis. Background Technology

[0002] To reduce CO2 emissions from the steel industry, carbon as a reducing agent can be reduced or even eliminated from the carbon input level. Currently, there are two possible options: one is hydrogen reduction in iron production, and the other is electrochemical iron smelting. Although both methods face significant challenges in industrialization, compared to hydrogen reduction iron smelting, electrochemical metallurgy can directly utilize electrical energy to reduce iron oxides, making it a production technology with easily controllable reaction processes and higher energy efficiency.

[0003] Currently, molten salt electrolytic iron production is mostly in the laboratory research stage, and many problems need to be solved. The challenge of achieving continuous production in oxide-based electrolytic processes is a problem that urgently needs to be addressed by those skilled in the art. Utility Model Content

[0004] Based on a systematic study of the sintering ore formation mechanism, this invention provides a sintering ore electrolytic iron production system for cases where oxides such as CaO, MgO, Al2O3, SiO2, and Fe2O3 are present in sintered ore. This system uses iron oxide as raw material, employs molten oxides containing SiO2 and CaO as electrolyte, uses liquid iron as cathode and an inert material as anode, deposits metallic iron at the cathode, and releases oxygen at the anode. Based on the siphon principle, the molten iron and slag can flow out independently, achieving industrialized and continuous production of sintering ore electrolytic iron production.

[0005] Therefore, the present invention adopts the following technical solution:

[0006] A sintered ore electrolytic iron production system, characterized by comprising, in sequence, an electrolysis unit, a feeding unit, a gas collecting unit, and a slag and iron discharge unit. The electrolysis unit includes an electrolytic cell, a power supply, and an anode and a cathode connected thereto. The cathode is located at the bottom of the electrolytic cell's inner cavity, and the anode is located at the top of the inner cavity. The feeding unit is connected to a feeding port at the top of the electrolytic cell, through which the raw material sintered ore enters the electrolytic cell. The gas collecting unit includes an oxygen outlet connected to the top of the electrolytic cell, where oxygen generated during electrolysis accumulates at the top of the electrolytic cell and enters the pipeline network through the oxygen outlet. The slag and iron discharge unit includes an iron molten outlet and a slag outlet. The iron molten outlet is located at the bottom of the electrolytic cell and is used to discharge the molten iron at the bottom of the electrolytic cell; the outlet of the iron molten outlet is connected to an iron ladle. The slag outlet is located in the middle of the electrolytic cell and is used to discharge the molten slag at the top of the electrolytic cell; the outlet of the slag outlet is connected to a slag ladle.

[0007] Furthermore, the electrolytic cell should preferably be made of a material with the characteristics of a graphite crucible. In addition to meeting the high temperature resistance requirements, the pure iron produced during the electrolysis process contains relatively few inclusions.

[0008] Furthermore, the anode is made of durable inert materials (such as nickel wire, platinum wire, etc.), which have the characteristics of high temperature resistance, resistance to anodic polarization, and resistance to oxidation;

[0009] Furthermore, a molybdenum wire is selected as the cathode. When the oxides containing CaO, MgO, Al2O3, SiO2 and Fe2O3 form a molten electrolyte at high temperature (1550-1750℃), the liquid iron reduced therefrom becomes the cathode.

[0010] The feeding unit includes feeding raw sintered ore into the electrolytic cell through the feeding port, electrolyzing FeO-containing MgO-CaO-SiO2-Al2O3 oxide melt at high temperature, and producing liquid iron and oxygen at the cathode and anode respectively.

[0011] Furthermore, a certain amount of NaF can be added to the sinter as a flux to improve the performance of the electrolyte, reduce its viscosity, and increase its ionic conductivity.

[0012] The gas collection unit includes a gas layer in the upper part of the electrolytic cell where oxygen produced at the anode is enriched, and the gas enters the pipeline network through the oxygen outlet.

[0013] The slag and iron discharge unit includes two stages: molten iron discharge and molten slag discharge. Liquid iron produced at the cathode is deposited at the bottom of the electrolytic cell and flows out into the iron ladle through the molten iron discharge port set on the side wall of the electrolytic cell. Molten slag, which serves as the electrolyte, is located above the molten iron in the electrolytic cell and flows out into the slag ladle through the molten slag discharge port set on the side wall of the electrolytic cell.

[0014] Furthermore, the outlets for both molten iron and slag form a U-shaped structure with the electrolytic cell, creating a siphon effect that allows the molten iron and slag to flow out automatically, effectively controlling the liquid level.

[0015] The beneficial effects of this utility model are as follows:

[0016] This invention uses sintered ore containing iron oxide as raw material, employs molten oxide containing SiO2 and CaO as electrolyte, uses liquid iron as cathode and inert material as anode, deposits metallic iron on the cathode and releases oxygen on the anode, and, based on the siphon principle, allows the molten iron and molten slag to flow out independently, thus realizing the industrialized and continuous production of iron from sintered ore electrolysis. Attached Figure Description

[0017] Figure 1 This is a process flow diagram of the present invention;

[0018] In the diagram: 1-Electrolytic cell, 2-Power source, 3-Cathode, 4-Anode, 5-Feed port, 6-Sintered ore, 7-Iron surface, 8-Slag surface, 9-Liquid iron, 10-Molten slag, 11-Oxygen, 12-Oxygen outlet, 13-Iron outlet, 14-Iron ladle, 15-Molten slag outlet, 16-Slag ladle. Detailed Implementation

[0019] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments:

[0020] like Figure 1 As shown, a sintered ore electrolytic iron production system comprises an electrolytic cell 1, a power supply 2, and cathodes 3 and anodes 4 connected thereto, forming an electrolytic system. The cathode 3 is located at the bottom of the inner cavity of the electrolytic cell 1, and the anode 4 is located at the upper part of the inner cavity of the electrolytic cell 1. Raw material sintered ore 6 is added into the electrolytic cell 1 through the feed port 5, and electrolyzed under high temperature conditions to form an oxide melt, i.e., molten slag 10. Liquid iron 9 and oxygen 11 are produced at the cathode and anode, respectively.

[0021] The anode 4 is made of nickel wire, which has the characteristics of high temperature resistance, anti-anodic polarization, and anti-oxidation, making it durable. When the electrolysis temperature reaches 1550-1750℃, the liquid iron 9 reduced during the formation of molten electrolyte is deposited around the cathode 3 (made of molybdenum wire), becoming the true cathode. The oxygen 11 produced at the anode 4 is enriched in the upper part of the electrolytic cell 1 and enters the pipeline network through the oxygen outlet 12.

[0022] Liquid iron 9, produced at cathode 3, is deposited at the bottom of electrolytic cell 1 and flows out through iron molten outlet 13 located on the side wall of the electrolytic cell into iron ladle 14. Molten slag 10, serving as the electrolyte, is located above the liquid iron 9 inside electrolytic cell 1 and flows out through slag outlet 15 located on the side wall of electrolytic cell 1 into slag ladle 16. Slag outlet 15 is located above iron molten outlet 13. Both iron molten outlet 13 and slag outlet 15 form a U-shaped structure with electrolytic cell 1, creating a siphon effect that allows liquid iron 9 and molten slag 10 to flow out automatically, effectively controlling the liquid level.

[0023] A certain amount of NaF can be added to sinter 6 as a flux to improve the performance of the electrolyte, reduce its viscosity, and increase its ionic conductivity.

[0024] The above system can be used to process iron-containing materials such as oxidizing sinter, direct reduced iron, oxidizing iron scale, and iron oxide red.

Claims

1. A device for producing iron from sintered ore by electrolysis, characterized in that, It includes an electrolysis unit, a feeding unit, a gas collection unit, and a slag and iron discharge unit that are connected in sequence. The electrolysis unit includes an electrolytic cell (1), a power supply (2), and a cathode (3) and an anode (4) connected thereto. The cathode (3) is located at the bottom of the inner cavity of the electrolytic cell (1), and the anode (4) is located at the top of the inner cavity of the electrolytic cell (1). The feeding unit is connected to the feeding port (5) at the top of the electrolytic cell (1), and the raw material sintered ore enters the electrolytic cell (1) from the feeding port (5); The gas collection unit includes an oxygen outlet (12) connected to the upper part of the electrolytic cell (1). The oxygen generated by electrolysis accumulates in the upper part of the electrolytic cell (1) and enters the pipeline network through the oxygen outlet (12). The slag and iron discharge unit includes an iron molten outlet (13) and a slag discharge outlet. The iron molten outlet (13) is located at the bottom of the electrolytic cell (1) and is used to discharge the molten iron at the bottom of the electrolytic cell (1). The outlet of the iron molten outlet (13) is connected to an iron ladle (14). The slag discharge outlet is located in the middle of the electrolytic cell (1) and is used to discharge the molten slag (10) at the top of the electrolytic cell (1). The outlet of the slag discharge outlet is connected to a slag ladle (16).

2. The sintered ore electrolytic ironmaking apparatus according to claim 1, characterized in that, The molten iron outlet (13) and the slag outlet form a U-shaped structure, creating a siphon effect, allowing the molten iron and slag to flow out automatically, thereby controlling the liquid level.

3. The sintered ore electrolytic ironmaking apparatus according to claim 1, characterized in that, The anode (4) is made of nickel wire or platinum wire.

4. The sintered ore electrolytic ironmaking apparatus according to claim 1, characterized in that, The cathode (3) is made of molybdenum wire.

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