Pure iron production method through smelting reduction technique

A reduction method, pure iron technology, applied in the improvement of process efficiency, manufacturing converters, furnace types, etc., can solve the problems of high cost, high value, and difficulty of high-purity iron, achieve stable production process control, excellent product quality, The effect of low production cost

Active Publication Date: 2020-09-15
SHANDONG MOLONG PETROLEUM MACHINERY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The preparation of high-purity iron mainly includes electrolysis, electroslag remelting, space purification, plasma smelting, etc. Most of them are still in the small-scale laboratory stage, which cannot meet the existing market demand, and the cost of the prepared high-purity iron is high. When Fe When the content reaches 99.95%-99.9999%, the product price can reach 1-1.5 million yuan / t, the higher the purity, the greater the difficulty and the higher the value
The preparation technology of high-purity iron at home and abroad is still immature, and the supply of high-purity iron cannot meet the demand. Therefore, the demand for industrial pure iron with low production cost and high purity is urgent

Method used

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  • Pure iron production method through smelting reduction technique
  • Pure iron production method through smelting reduction technique
  • Pure iron production method through smelting reduction technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] The primary iron produced has a carbon content of 3.6%, a phosphorus content of 0.010%, a sulfur content of 0.12%, a silicon content of 0.0040%, and a manganese content of 0.001%.

[0078] Primary iron (hot metal temperature 1320°C) is pretreated outside the furnace, smelted in an oxygen converter, refined in an LF refining furnace, and decarburized and deoxidized in a VOD vacuum furnace to produce industrial pure iron of YT4 grade. The specific steps are as follows:

[0079] (1) Pretreatment outside the furnace

[0080] Use compound desulfurizer to carry out desulfurization and carbon adjustment to primary iron, so that the sulfur content of molten iron after desulfurization and carbon adjustment is 0.0010wt%, and carry out slag removal treatment to the molten iron after desulfurization and carbon adjustment until the residual slag in molten iron is less than 5wt% of the total slag;

[0081] The compound desulfurizer includes: 15 parts of magnesium powder, 30 parts of...

Embodiment 2

[0100] The primary iron produced has a carbon content of 3.8%, a phosphorus content of 0.012%, a sulfur content of 0.105%, a silicon content of 0.0042%, and a manganese content of 0.001%.

[0101] Primary iron (hot metal temperature 1360°C) is pretreated outside the furnace, smelted in an oxygen converter, refined in an LF refining furnace, and decarburized and deoxidized in a VOD vacuum furnace to produce industrial pure iron of YT4 grade. The specific steps are as follows:

[0102] (1) Pretreatment outside the furnace

[0103] Use compound desulfurizer to carry out desulfurization and carbon adjustment to the primary iron, so that the sulfur content of the molten iron after desulfurization and carbon adjustment is 0.0008wt%, and carry out slag removal treatment to the desulfurization and carbon adjustment of the molten iron until the residual slag in the molten iron is less than 5wt% of the total slag;

[0104] The compound desulfurizer includes: 18 parts of magnesium powde...

Embodiment 3

[0122] The primary iron produced has a carbon content of 4.0%, a phosphorus content of 0.015%, a sulfur content of 0.09%, a silicon content of 0.0045%, and a manganese content of 0.001%.

[0123] Primary iron (hot metal temperature 1380°C) is pretreated outside the furnace, smelted in an oxygen converter, refined in an LF refining furnace, and decarburized and deoxidized in a VOD vacuum furnace to produce industrial pure iron of YT4 grade. The specific steps are as follows:

[0124] (1) Pretreatment outside the furnace

[0125] Use compound desulfurizer to carry out desulfurization and carbon adjustment to the initial iron, so that the sulfur content of the molten iron after desulfurization and carbon adjustment is 0.0007wt%, and carry out slag removal treatment to the molten iron after desulfurization and carbon adjustment until the residual slag in the molten iron is less than 5wt% of the total slag;

[0126] The compound desulfurizer includes: 20 parts of magnesium powder,...

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Abstract

The invention relates to the technical field of metal smelting, in particular to a pure iron production method through smelting reduction technique. The pure iron production method through smelting reduction technique comprises the process of preparing YT4 pure iron from initial iron, and raw materials are the initial iron produced through an iron bath smelting reduction method. According to products obtained through the method, the iron content can reach 99.95% or above, content requirements of the YT4 industrial pure iron and high-purity iron are met, scale production of the YT4 industrial pure iron can be achieved, the product purity is high, the production cost is low, safety and environment protection are achieved, the quality meets the requirements of the YT4 industrial pure iron andthe high-purity iron, control over the production process is stable, and the product quality is excellent.

Description

technical field [0001] The invention relates to the technical field of metal smelting, in particular to a method for producing pure iron by a smelting reduction process. Background technique [0002] Pure iron is a kind of steel with very low carbon content ([C]<0.01%), which has the properties of high iron purity, good toughness, good magnetic properties and excellent electrical properties. As an industrial pure iron for industrialized production and application, the iron element content in the product reaches 99.6%-99.8%. Industrial pure iron is an important steel basic material, mainly used for smelting various high-temperature alloys, heat-resistant alloys, precision alloys, Maraging steel, high temperature bearing steel and other aerospace, military and civilian alloys or steels. [0003] The preparation of high-purity iron mainly includes electrolysis, electroslag remelting, space purification, plasma smelting, etc. Most of them are still in the stage of small-scal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B11/00C21C1/02C21C5/36C21C5/54C21C7/076C21C7/10C21C7/06C21C7/068C21C7/064
CPCC21B11/00C21C1/02C21C1/025C21C5/36C21C5/54C21C7/076C21C7/10C21C7/06C21C7/068C21C7/064C21C7/0056Y02P10/20
Inventor 张冠琪王林顺张晓峰王金霞王建磊王振华魏召强张静波马宗礼韩军义
Owner SHANDONG MOLONG PETROLEUM MACHINERY
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