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Oxygen spraying smelting reduction iron-making process

A process and technology of molten iron, which is applied in high-temperature smelting reduction smelting and smelting reduction ironmaking. It can solve problems affecting the rhythm of smelting, simple structure, and easy burning loss, etc., so as to improve heat exchange efficiency, increase service life, and increase injection depth. Effect

Inactive Publication Date: 2020-09-08
内蒙古赛思普科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing oxygen lances are often simple in structure, easy to burn out during use, and also produce a lot of loss and energy consumption during the oxygen injection process, and affect the rhythm of smelting

Method used

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  • Oxygen spraying smelting reduction iron-making process
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  • Oxygen spraying smelting reduction iron-making process

Examples

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Embodiment 1

[0040] An oxygen injection smelting reduction ironmaking process, comprising the following steps,

[0041] When selecting ore raw materials, strictly control the phosphorus content in the ore 53%, strictly control the particle size of the ore powder 2 O3+SiO 2 ).

[0042] At the same time, ensure that the particle size of coal powder is less than 6mm, the moisture content of coal powder is less than 3%, and the temperature is ≥80°C. Inert or reducing gas is sprayed into the reduction zone (6) of the smelting reduction reaction furnace through the coal powder spray gun (3) respectively, and passes through the slag layer. Spray into the molten iron pool to replenish carbon for the molten iron, the temperature of the molten pool is controlled within the range of 1450-1550°C, and the gas carrying capacity of the pulverized coal injection system is 1500-4000Nm 3 / h, hot ore blowing gas consumption 7000 ~ 10000Nm 3 / h, to ensure that the injection system is stable, so that the re...

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Abstract

The invention relates to an oxygen spraying smelting reduction iron-making process which comprises the following steps of adding reasonable dolomite and quicklime powder into iron ores in a fit manner, spraying the mixture by an ore powder spray gun (2) into a reduction area (6) of a smelting reduction reaction furnace through a heating system, spraying pulverized coal into the reduction area (6)of a smelting reduction reaction furnace through a pulverized coal spray gun (3) by means of inert gas or reductive gas, and spraying the mixture into a molten iron molten bath through a slag layer tosupplement carbon for molten iron; and blowing normal temperature high purity oxygen from the upper side of the smelting reduction reaction furnace through an oxygen spraying device (1), ensuring a gas component proportion in the slag: (H2+CO) / (CO2+H2O) is smaller than 10 by spraying oxygen, controlling the slag amount to be greater than 0.5 t / tFe, controlling the slagging temperature to be higher than 1400 DEG C, controlling the alkalinity and the tapping temperature to be higher than 1350 DEG C, and desulfurizing the tapped molten iron, wherein the residual magnesium amount after desulfurization shall be controlled at 0.010-0.020%. The process improves the center oxygen spraying depth, reduces disturbance of environmental factors and improves the smelting efficiency.

Description

technical field [0001] The invention belongs to the technical field of smelting reduction ironmaking, relates to the field of non-blast furnace smelting ironmaking, and relates to an oxygen spraying smelting reduction ironmaking process, and is applicable to the field of high-temperature smelting reduction smelting in the field of black and nonferrous metallurgy. Background technique [0002] Among the many non-blast furnace ironmaking processes, the smelting reduction method has the most potential for development. This process has a fast reaction rate and the melting strength of molten iron is about 5 to 10 times that of the blast furnace. Directly use non-coking coal powder and iron ore powder as raw materials, cancel the iron pretreatment process of traditional blast furnace ironmaking, reduce the pollution generated in the ironmaking process, improve energy utilization rate and economic benefits of ironmaking. However, the existing oxygen lances are often simple in struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B11/00C21C1/02
CPCC21B11/00C21C1/02C21C1/025Y02P10/143
Inventor 刘志国徐涛周海川张勇程鹏任俊昝智卜二军段炼孟凡旭
Owner 内蒙古赛思普科技有限公司
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