Controllable atmosphere rotary hearth furnace process for producing direct reduction iron

A technology of rotary hearth furnace and reduced iron, which is applied in the field of production of reduced iron, which can solve the problems of reducing the coke ratio, leakage of double-screw discharger, and low iron grade, so as to increase production, avoid secondary oxidation, and improve The effect of product quality

Inactive Publication Date: 2013-03-27
武汉桂坤科技有限公司
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Problems solved by technology

[0004] The development of rotary hearth furnace technology in China also has a certain history. In recent years, a number of rotary hearth furnace devices have been built successively to process special iron-containing materials such as compound ore, low-grade refractory iron ore, zinc-containing dust from iron and steel plants, and laterite ore. Good results have been obtained, but the traditional rotary hearth furnace has a larg

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  • Controllable atmosphere rotary hearth furnace process for producing direct reduction iron

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Embodiment 1

[0022] Embodiment 1: as figure 1 As shown, the reducing agent used in this embodiment is a mixture of anthracite and desulfurizing agent, the quality of anthracite: the quality of desulfurizing agent=1:0.15, the present invention is carried out according to the following steps: (1) powdery iron-containing oxide and binder Mix the materials at a weight ratio of 1:0.01, and then use a forming machine to roll them into pellets with a diameter of 30mm; (2) Put the pellets into the grate rotary kiln and preheat to 800°C; (3) The preheated material The material is sent to the 2-stage distribution port of the furnace roof through the feeder; the controllable atmosphere rotary hearth furnace top is equipped with 3 height-adjustable distributors, and the 1st and 3rd-level distribution ports are equipped with reducing agents, and the reducing agent is anthracite. Quality: quality of desulfurizer = 1:0.15, 2nd level distribution of iron pellets; (4) distribution operation: controllable a...

Embodiment 2

[0023] Embodiment 2: as figure 1 A controllable atmosphere rotary hearth furnace process for the production of direct reduced iron is shown, which is carried out in the following steps:

[0024] (1) Mix powdery iron-containing oxide, binder and carbon powder at a weight ratio of 1:0.01:0.15, and then use a molding machine to roll into internal carbon pellets with a diameter of 30mm;

[0025] (2) The internal carbon pellets are preheated to 900°C through the grate rotary kiln;

[0026] (3) The preheated material is sent to the second-stage material distribution port on the top of the rotary hearth furnace through the feeder;

[0027] (4) Material distribution operation: the bottom plate of the controllable atmosphere rotary hearth furnace rotates counterclockwise, and carbon pellets are distributed from the second-level material distribution port, and the material distribution height is set to 70mm;

[0028] (5) All the materials are run in the rotary hearth furnace at about ...

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Abstract

The invention relates to a controllable atmosphere rotary hearth furnace process for producing direct reduction iron, comprising the steps of: pressing iron ore concentrate powder into pellets with the diameter of 30-40mm or directly using lump ores with the granularity of 5-25mm; preheating to 700-1000 DEGC at first; then mixing with a reducing agent; adding the mixture into a controllable atmosphere rotary hearth furnace; laying materials with the thickness of 30-70mm, wherein during laying materials, if the common iron ore powder pellets are used 5-10mm of reducing agent is paved at the bottom of the furnace in advance, and 5-10mm of reducing agent is scattered to the mixture at last, and the step of scattering the reducing agent is not needed if internally arranged carbon pellets are used; enabling all materials to operate in the controllable atmosphere rotary hearth furnace for 3-8h at 1200-1400 DEG C; discharging the materials out of the furnace by a water-cooled spiral discharging machine introduced with protective gas; and carrying out magnetic separation on the discharged materials to obtain sponge iron pellets. The materials are preheated at first and then reduced by the controllable atmosphere rotary hearth furnace, and the controllable atmosphere rotary hearth furnace process is suitable for various kinds of materials; and the temperature in a furnace hearth is uniform, the automation degree of equipment is high, workers operate simply and conveniently, and sponge iron meeting the demand of steel-making can be produced.

Description

technical field [0001] The invention relates to a method for producing reduced iron, which adopts a two-step process of a controlled atmosphere rotary hearth furnace and can use iron-containing oxides such as iron concentrate powder / high-grade lump ore / rolled steel scale (Fe≥68%) Produce ground reduced iron that meets the needs of the steel industry. Background technique [0002] Direct reduced iron, also known as sponge iron, is a low-carbon porous substance formed by reducing iron-containing oxides such as iron concentrate powder / high-grade lump ore / rolled steel scale in a reduction furnace. Its chemical composition is stable and its impurity content is low. It is mainly used as a raw material for electric furnace steelmaking, and also as a coolant for converter steelmaking. In recent years, due to the development of iron and steel products in the direction of small and light weight, advanced functions, and composites, the proportion of non-metallic materials and non-ferr...

Claims

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Application Information

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IPC IPC(8): C21B13/10
Inventor 李森蓉余阳春李雄赵少杰
Owner 武汉桂坤科技有限公司
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