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Pure iron smelting method

A technology for pure iron and molten iron, applied in the field of desulfurization and dephosphorization in the smelting process, can solve problems such as poor decarburization effect, and achieve the effects of low cost, simple process and reduction of converter slag volume.

Active Publication Date: 2015-02-25
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Patent No. 200710044143.2 discloses "an ultra-low-carbon high-purity industrial pure iron and its manufacturing method". The EAF+AOD process is used for dephosphorization and desulfurization. The phosphorus content can only reach 0.005%, and the decarburization effect is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this embodiment, pure iron is smelted under the conditions of 0.059% P content and 0.031% S content in blast furnace molten iron to effectively reduce the phosphorus and sulfur content of pure iron, which specifically includes the following steps:

[0031] Step 1 Desiliconization and dephosphorization of molten iron

[0032] After molten iron enters the steelmaking plant, desiliconization and dephosphorization are carried out in the pretreatment process. It mainly includes the following operations: 1) Slag removal; 2) Oxygen blowing 12Nm 3 / ton of iron, while the added component is Fe 2 o 3 :CaO:CaF 2 =30%: 60%: 10% desiliconization and dephosphorization powder 45 kg / ton of iron; 3) Slag removal, the P content of molten iron before slag removal is 0.006%.

[0033] Step 2 Desulfurization of molten iron

[0034] Use the method of injecting metal magnesium for desulfurization, the amount of metal magnesium used is 1.0kg / ton of iron, the powder supply speed is 5kg / ...

Embodiment 2

[0043] In this embodiment, pure iron is smelted under the conditions of 0.050% P content and 0.051% S content in blast furnace molten iron to effectively reduce the phosphorus and sulfur content of pure iron, which specifically includes the following steps:

[0044] Step 1 Desiliconization and dephosphorization of molten iron

[0045] After molten iron enters the steelmaking plant, desiliconization and dephosphorization are carried out in the pretreatment process. It mainly includes the following operations: 1) Slag removal; 2) Oxygen blowing 10.5Nm 3 / ton of iron, while the added component is Fe 2 o 3 :CaO:CaF 2 =30%: 60%: 10% desiliconization and dephosphorization powder 39 kg / ton of iron; 3) Slag removal, the P content of molten iron before slag removal is 0.005%.

[0046] Step 2 Desulfurization of molten iron

[0047] Use the method of injecting metal magnesium for desulfurization, the amount of metal magnesium used is 1.5kg / ton of iron, the powder supply speed is 6k...

Embodiment 3

[0055] This implementation is to smelt pure iron under the conditions of 0.056% P content and 0.045% S content in blast furnace molten iron, effectively reducing the phosphorus and sulfur content of pure iron, specifically including the following steps:

[0056] Step 1 Desiliconization and dephosphorization of molten iron

[0057] After molten iron enters the steelmaking plant, desiliconization and dephosphorization are carried out in the pretreatment process. It mainly includes the following operations: 1) Slag removal; 2) Oxygen blowing 11.6Nm 3 / ton of iron, while the added component is Fe 2 o 3 :CaO:CaF 2 =30%: 60%: 10% desiliconization and dephosphorization powder 43 kg / ton of iron; 3) Slag removal, the P content of molten iron before slag removal is 0.006%.

[0058] Step 2 Desulfurization of molten iron

[0059] Use the method of injecting metal magnesium for desulfurization, the amount of metal magnesium used is 1.3kg / ton of iron, the powder supply speed is 6kg / min,...

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Abstract

The invention relates to a pure iron smelting method. The method comprises the following steps: 1, molten iron silicon and phosphorus removal treatment: removing silicon and phosphorus from molten iron; 2, molten iron desulphurization: desulphurizing through using a metal magnesium blowoing process, and removing slag to obtain blast furnace molten iron including 0.060% or less of P and 0.050% or less of S; 3, converter smelting: slagging and dephosphorizing in the smelting period to the P content of 0.0025% or less; 4, VOD depth decarburization: carrying out VOD evacuation for natural decarburization, adding aluminum granules for deoxidation after decarburization until the dissociate oxygen content [O]dissociation in pure iron is not greater than 10ppm; and 5, VOD depth desulphurization: adding a desulphurization agent after the deoxidation ending, circulating for 8-10min, ending vacuum, transferring to continuous casting, and casting. The pure iron obtained through the pure iron smelting method has a high purity and a low cost.

Description

technical field [0001] The invention relates to a method for smelting pure iron, specifically a method for dephosphorization and desulfurization during the smelting process. Background technique [0002] The raw material pure iron is mainly used to produce special metal materials such as permanent magnet materials, electrothermal alloys, precision alloys, low-carbon stainless steel, and amorphous. Some materials require raw material pure iron to have extremely low phosphorus and sulfur content. At present, Japan uses the electrolysis method to produce high-purity raw material pure iron, and the price is extremely high, while the domestic production of raw material pure iron generally has the problem of high residual elements. Domestic similar patented technologies and their application effects are as follows. [0003] Patent No. 200910013128.0 discloses "a method for producing high-purity pure iron". The process adopted is: molten iron pretreatment desulfurization → conver...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C1/02C21C7/10
Inventor 陈泽民苗晓辛宪诚王新宇
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD