A method for producing ultra-high-purity pig iron by iron bath smelting reduction

A technology of iron bath melting and reduction method, which is applied in the field of smelting reduction metallurgy, can solve the problems of restricting the production and supply of high-purity pig iron and ultra-high-purity pig iron, and the ineffective development and utilization of high-phosphorus ore and vanadium-titanium ore. Achieve the effects of improving the purity of molten iron, benefiting environmental protection, and shortening the process flow

Active Publication Date: 2021-12-24
SHANDONG MOLONG PETROLEUM MACHINERY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the production of high-purity pig iron and ultra-high-purity pig iron through blast furnaces is highly dependent on high-quality raw materials, and domestic high-quality raw materials are limited, my country imports a large amount of iron ore from Australia, Brazil and other countries every year, which seriously restricts domestic high-purity pig iron and The relationship between the production and supply of ultra-high-purity pig iron, and the low-grade and high-phosphate ore and vanadium-titanium ore with abundant domestic reserves have not been effectively developed and utilized

Method used

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  • A method for producing ultra-high-purity pig iron by iron bath smelting reduction

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Embodiment 1

[0069] This embodiment provides a method for producing ultra-high-purity pig iron by iron bath smelting reduction, comprising the following steps:

[0070] (1) Screen the raw materials for the furnace, including mineral powder, coal powder, dolomite powder and limestone powder

[0071] The conditions that each raw material needs to meet are as follows:

[0072] Mineral powder: the grade of iron in the mineral powder is not lower than 58wt%, the content of phosphorus is not higher than 0.2wt%, the content of sulfur is not higher than 0.05wt%, the particle size is not higher than 20mm, and the particle size is not lower than 4mm in the total mineral powder The content in powder is not higher than 10wt%;

[0073] Coal powder: Coal is crushed and ground by a coal mill to obtain coal powder. The fixed carbon content in coal powder is not less than 75wt%, the volatile content is 5-15wt%, the sulfur content is not higher than 0.8wt%, and the particle size is not higher than 10mm , ...

Embodiment 2

[0119] The same technical features of this embodiment and embodiment 1 will not be described in detail. The different technical features of this embodiment and embodiment 1 are that in step (2), the mineral powder is preheated and pre-oxidized to remove the mineral powder. For sulfur and arsenic, preheat and preoxidize the ore powder in the rotary kiln. The conditions for preheating and preoxidation are as follows:

[0120] Control the amount of combustion gas to account for 15%-35% of the gas output of the smelting reduction furnace;

[0121] Control the oxygen content of the oxygen-enriched hot air at 21%-32%;

[0122] Control the discharge temperature of the preheated and preoxidized ore powder at 565-750°C.

[0123] The above conditions satisfy the decomposition of main sulfides in the ore powder and the removal of sulfur combustion, so as to achieve a pre-desulfurization rate of 50-80% and a pre-arsenic removal rate of 30-40%.

[0124] In this embodiment, the desulfuriz...

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Abstract

The application relates to a method for producing ultra-high-purity pig iron by an iron bath smelting reduction method. The method for producing ultra-high-purity pig iron includes the following steps: screening the raw materials for the furnace, the raw materials for the furnace include ore powder, coal powder, magnesium-containing flux and limestone powder; preheating and pre-oxidizing the ore powder to remove the ore powder Sulfur and arsenic in the furnace; the preheated and pre-oxidized ore powder and magnesium-containing flux are blown into the smelting reduction furnace through the ore powder injection system; the coal powder and limestone powder are blown into the smelting reduction furnace through the coal powder injection system ; By controlling the production conditions in the smelting reduction furnace, the initial molten iron is obtained; the initial molten iron is desulfurized outside the furnace to obtain ultra-high-purity pig iron. This method pre-oxidizes the low-grade ore powder before sending it into the smelting reduction furnace to achieve a desulfurization rate of 50-80% and arsenic removal rate of 30-40%, and then controls the production in the smelting reduction furnace Conditions and desulfurization outside the furnace to produce ultra-high-purity pig iron, which solves the problem of over-reliance on high-quality raw materials for domestic production of ultra-high-purity pig iron.

Description

technical field [0001] The application relates to a method for producing ultra-high-purity pig iron by an iron bath smelting reduction method, which belongs to the technical field of smelting reduction metallurgy. Background technique [0002] With the transformation of my country from a big foundry country to a powerful foundry country, and the development of domestic automobile, wind power, shipbuilding, chemical industry, high-speed train and other industries, the demand for high-purity pig iron, especially ultra-high-purity pig iron, is increasing day by day, but the foundry pig iron in my country is generally There are problems of high titanium and phosphorus content and excessive impurities and trace elements. A large number of high-purity pig iron and ultra-high-purity pig iron for high-quality foundry still rely on imports. [0003] In China, most high-purity pig iron and high-quality foundry pig iron are produced by selecting furnace materials and optimizing the blas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/14
CPCC21B13/0006C21B13/0066C21B13/14
Inventor 张冠琪王金霞王林顺张晓峰张巧丽魏召强李朋王建磊陈庆孟
Owner SHANDONG MOLONG PETROLEUM MACHINERY
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