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A method for iron ore reduction and ironmaking by applying an electric field

An electric field and iron ore technology, applied in the field of electrochemical smelting reduction of iron ore, can solve the problems of poor product quality, huge investment, low production efficiency, etc., and achieve simple device structure, huge social benefits, and zero emissions. Effect

Active Publication Date: 2019-02-26
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Even so, there are still some problems in the blast furnace process: complex process flow, high energy consumption, serious environmental pollution and huge investment, etc.
[0008] Various gas-based reduction processes can produce sponge iron or hot briquettes at lower temperatures. The shaft furnace process (MIDREX, HYL-III) is more mature than the fluidized bed process (FINMET), so the shaft furnace process still dominates the gas-based reduction process. The reduction process and the gas-based reduction process all use natural gas resources at present, and it is difficult to develop in our country
The rotary hearth furnace process can use low-strength carbon-containing pellets to inject new vitality into the coal-based direct reduction process, but its high energy consumption, low production efficiency, and poor product quality will restrict its development

Method used

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  • A method for iron ore reduction and ironmaking by applying an electric field
  • A method for iron ore reduction and ironmaking by applying an electric field
  • A method for iron ore reduction and ironmaking by applying an electric field

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Effect test

Embodiment 1

[0039] see figure 1 , the present invention uses an electric field to carry out iron ore reduction and ironmaking equipment comprising: an anode lifting frame 1, a gas supply device 2, 2 protective gas holes 3, a molten electrolyte 4, a heating furnace 5, an iron-carbon metal melt 6, an anode 7, DC power supply 8 and cathode 9. It is characterized in that: there are iron-carbon metal melt 6 and molten electrolyte 4 in the heating furnace 5; the iron-carbon metal melt 6 is placed in the lower layer of the heating furnace 5, and the molten electrolyte 4 is placed in the upper layer; it is set in the middle above the molten electrolyte 4 There is an anode lifting frame 1, on which are installed a number of parallel and vertically arranged anodes 7, the lower end of the anode 7 is inserted into the molten electrolyte 4 in the upper part of the heating furnace 5, and the anode wire is drawn out from the upper part, and the wire is connected with the DC power supply 8 The positive ...

Embodiment 2

[0045] see figure 1 , The iron ore reduction ironmaking device using an electric field in the present invention is as described in Embodiment 1 above, and will not be repeated here.

[0046] Described iron ore powder is Newman iron ore powder, and its main composition and content are as shown in table 1; Described slagging agent is small grain lime and bauxite, and the dosage ratio of small grain lime and bauxite is 3:2, Their respective main compositions and contents are shown in Table 2 and Table 3. After mixing, CaO+Al 2 o 3 Reach 89% (mass percentage ratio), and its mass percentage ratio CaO: Al 2 o 3 =1.6, the mass percentage of MgO in the slagging agent is 4.28%, and the rest is SiO 2 ,P 2 o 5 , P, S and other impurities; the ratio of iron ore powder to slagging agent is 0.7; the ratio of iron-carbon metal to electrolyte raw material is 2.

[0047] The output voltage U of the external DC power supply is 5V, the output current I is 400A, and 2.26A / cm can be generat...

Embodiment 3

[0050] see figure 1 , the present invention uses an electric field to carry out iron ore reduction and ironmaking equipment as described in the first embodiment, the difference is that the anode is a high-temperature resistant cermet, the shape is a cylinder, and the diameter is Φ240mm;

[0051] Described iron ore powder is magnetically separated iron ore powder, and its main composition and content are as shown in Table 1; Described slagging agent is small grain lime and bauxite, and the dosage ratio of small grain lime and bauxite is 2:1 , and their respective main compositions and contents are shown in Table 2 and Table 3. After mixing, CaO+Al 2 o 3 Reach 90% (mass percentage ratio), and its mass percentage ratio CaO: Al 2 o 3 =2.1, the mass percentage of MgO in the slagging agent is 4.03%, and the rest is SiO 2 ,P 2 o 5 , P, S and other impurities; the ratio of the iron ore powder to the slagging agent is 0.8; the ratio of the iron-carbon metal to the electrolyte raw...

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Abstract

The invention discloses a method for making iron by conducting iron ore reduction through an electric field. Iron ore powder serves as the raw material, a proper amount of slag forming constituents are added, and the iron ore powder and the slag forming constituents serve as electrolyte after being molten. The direct current electric field is applied between an inert anode placed in the electrolyte and a cathode placed in an iron carbon solution, and electrochemical reaction is conducted. Iron in ferric oxide in the electrolyte is reduced and enters the iron carbon solution, and oxygen in the ferric oxide has an anode reaction with the inert anode, then is exhausted in an oxygen gas form and enters the atmosphere.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to the iron-making technology of electrochemical smelting reduction of iron ore by applying an external electric field. Background technique [0002] In 2013, my country's crude steel output has exceeded 800 million tons, and the annual output is still growing at a rate of 3-5% per year. Most of them come from the blast furnace-converter process. After hundreds of years of development, the blast furnace ironmaking process has become increasingly mature. Even so, there are still some problems in the blast furnace process: complex process flow, high energy consumption, serious environmental pollution and huge investment. Its ironmaking process can be simply expressed by the following formula: [0003] 2Fe 2 o 3 +3C=4Fe(l)+3CO 2 (g) [0004] CO 2 It is the main gas that causes the greenhouse effect, and the iron and steel industry, which is character...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/00
CPCY02P10/134
Inventor 贾吉祥廖相巍倪翀奕郭庆涛刘祥彭春霖
Owner ANGANG STEEL CO LTD
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