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Direct reduction ironmaking method by electric furnace

An electric furnace and direct technology, applied in the field of iron and steel metallurgy, can solve the problems of low efficiency, high raw material requirements and high energy consumption, and achieve the effects of shortening the process flow, improving economic benefits and short smelting cycle

Inactive Publication Date: 2012-10-03
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the commonly used ironmaking method is traditional blast furnace ironmaking, but this method has disadvantages such as high energy consumption, low efficiency, and high raw material requirements.

Method used

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  • Direct reduction ironmaking method by electric furnace

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Effect test

Embodiment 1

[0025] Embodiment 1: The method of electric furnace direct reduction ironmaking in this embodiment is as follows: select an iron ore in Lancang, Yunnan Province as raw material, the chemical composition is shown in Table 1, first crush and batch the iron ore, and pelletize the particle size to 10-20mm iron ore is loaded into the secondary cyclone preheater. Connect the outlet of the secondary cyclone preheater to the inlet of the electric furnace, place coal powder with a carbon content of 70wt% in the electric furnace and heat it. The heating temperature is 1400°C. heater. Pellets obtained by pelletizing pellets. The pellets pass through the first-stage reactor and the second-stage reactor in turn. The temperature of the first-stage reactor is 400°C, and the temperature of the second-stage reactor is 800°C. The residence time of the pellets in each stage of the reactor is 20-30 minutes. The content of CO in the coal gas produced by electric furnace heating coal is 20mol%. ...

Embodiment 2

[0027] Embodiment 2: The method of electric furnace direct reduction ironmaking in this embodiment is: select an iron ore in Lufeng, Yunnan as raw material, the chemical composition is as shown in Table 2, connect the outlet of the five-stage cyclone preheater with the inlet of the electric furnace, and Put coal powder with a carbon content of 80wt% in the electric furnace and heat it. The heating temperature is 1500°C, and the gas with a CO content of 30mol% rises and passes into the multi-stage reactor, and then the iron ore is pelletized to produce Pellets with a particle size of 20-30 mm after the pellets are put into the first-stage reactor of the multi-stage reactor, and are sequentially passed through the multi-stage reactor and gas for suspension fluidization preheating and synchronous pre-reduction, and then the pellets from the multi-stage reactor are The iron ore pellets obtained in the first-stage reactor are sent into the electric furnace, and the gas continues to ...

Embodiment 3

[0029] Embodiment 3: The method of electric furnace direct reduction ironmaking in this embodiment is as follows: select iron ore with iron content of 30wt%, P<1wt%, S<0.1wt% for crushing and batching, and the particle size after pelleting is 10-100wt%. 40mm iron ore is loaded into the fluidized bed. Connect the outlet of the fluidized bed to the inlet of the electric furnace, place pulverized coal with a carbon content of 75wt% in the electric furnace and heat it at a temperature of 1600°C to produce gas with a CO content of 50mol% and pass it into the furnace. first-stage reactor, and then put the iron ore pellets with a particle size of 10-40 mm into the first-stage reactor of the multi-stage reactor, and carry out suspension flow through the multi-stage reactor and gas in turn. State-based preheating and synchronous pre-reduction, and then the iron ore pellets obtained from the multi-stage reactor are sent to the electric furnace, the gas continues to preheat and reduce t...

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Abstract

The invention discloses a direct reduction ironmaking method by an electric furnace, belonging to the technical field of ferrous metallurgy. An outlet of a multistage reactor is connected with an inlet of the electric furnace, coal powder is put into the electric furnace and heated, generated coal gas ascends and is introduced into the multistage reactor, iron ores are put into a first stage reactor of the multistage reactor after being treated by pelletizing and sequentially pass through the multistage reactor, an iron ore pellet obtained from the multistage reactor is then sent into the electric furnace, and finally the iron ore pellet is heated by the electric furnace and also reacted with the coal powder so as to obtain molten iron after ionmaking by the electric furnace. By developing the technology, the smelting energy consumption can be dramatically lowered, the operation conditions and smelting economic and technical indexes are improved, the economic benefit is increased, and the resource is effectively utilized.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a non-blast furnace ironmaking method using electric energy as a heating energy source, in particular through iron ore pelletizing, multistage reactor preheating and prereduction, and electric furnace direct reduction Smelting to produce qualified molten iron to improve the recovery rate of iron and reduce production costs. technical background [0002] Since the beginning of the 20th century, some countries began to study and use electric furnace ironmaking. In 1908, the first ironmaking electric furnace was put into industrial production in Sweden. Up to now, in some countries with rich hydropower resources (such as Norway), and countries with special resources (such as vanadium-titanite, iron sand, ilmenite) that are difficult to process by blast furnaces (such as South Africa, New Zealand), electric furnace ironmaking is still used and developed. develop. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/12C21B13/14
Inventor 李博卿山王华李幼灵
Owner KUNMING UNIV OF SCI & TECH
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