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Molten iron desulphurization method

A hot metal desulfurization and hot metal technology, which is applied in the field of steel rolling, can solve the problems of poor stability, high cost, and insignificant hot metal desulfurization effect, and achieve the effect of completely removing slag, reducing desulfurization cost, and preventing converter hot metal from increasing sulfur

Inactive Publication Date: 2014-05-28
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above technical problems, the present invention provides a method for desulfurization of molten iron, which solves the problems of insignificant desulfurization effect, poor stability and high cost in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for desulfurizing molten iron, comprising the steps of:

[0020] Add KR desulfurizer into the iron ladle, pour the molten iron into the iron ladle, and make the desulfurization reaction between the KR desulfurizer and the molten iron through stirring; desulfurize the iron ladle by injecting granular magnesium. The addition amount of the KR desulfurizer is determined according to the weight of molten iron.

[0021] The composition of the KR desulfurizer includes: 80% by weight of lime and 20% by weight of fluorite.

[0022] The activity of lime is to consume 320ml of HCl with a concentration of 4mol / ml within 10min in water at a constant temperature of 40±1°C.

[0023] The proportion of KR desulfurizer particles with a particle size between 0.5-1.0mm is greater than 80%, and the proportions with a particle size of less than 0.3mm and greater than 1.2mm are not greater than 10%.

[0024] The weight percent of the lime component includes SiO 2 ≤5%, S<0.03%, moi...

Embodiment 2

[0030] A method for desulfurizing molten iron, comprising the steps of:

[0031] Add KR desulfurizer into the iron ladle, pour the molten iron into the iron ladle, and make the desulfurization reaction between the KR desulfurizer and the molten iron through stirring; desulfurize the iron ladle by injecting granular magnesium. The addition amount of the KR desulfurizer is determined according to the weight of molten iron.

[0032] The composition of the KR desulfurizer includes: 95% lime by weight and 5% fluorite by weight.

[0033] The activity of lime is to consume 350ml of HCl with a concentration of 4mol / ml within 10min in water at a constant temperature of 40±1°C.

[0034] The proportion of KR desulfurizer particles with a particle size between 0.5-1.0mm is greater than 80%, and the proportions with a particle size of less than 0.3mm and greater than 1.2mm are not greater than 10%.

[0035] The weight percent of the lime component includes SiO 2 ≤5%, S<0.03%, moisture<0...

Embodiment 3

[0041] A method for desulfurizing molten iron, comprising the steps of:

[0042] Add KR desulfurizer into the iron ladle, pour the molten iron into the iron ladle, and make the desulfurization reaction between the KR desulfurizer and the molten iron through stirring; desulfurize the iron ladle by injecting granular magnesium. The addition amount of the KR desulfurizer is determined according to the weight of molten iron.

[0043] The composition of the KR desulfurizer includes: 85% lime by weight and 25% fluorite by weight.

[0044] The activity of lime is to consume 360ml of HCl with a concentration of 4mol / ml within 10min in water at a constant temperature of 40±1°C.

[0045] The proportion of KR desulfurizer particles with a particle size between 0.5-1.0mm is greater than 80%, and the proportions with a particle size of less than 0.3mm and greater than 1.2mm are not greater than 10%.

[0046] The weight percent of the lime component includes SiO 2 ≤5%, S<0.03%, moisture<...

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Abstract

The invention relates to a molten iron desulphurization method which comprises the following steps: adding a KR desulfurizer into an iron ladle, pouring molten iron into the iron ladle, stirring to carry out a desulphurization reaction between the KR desulfurizer and molten iron; and blowing granulated magnesium to the iron ladle so as to conduct desulphurization. The KR desulfurizer has advantages of low granularity, large reaction area and good average molten iron desulphurization effect. With the addition of the KR desulfurizer, CaO content of iron slag is effectively increased, alkalinity of iron slag is raised, iron slag is modified, and it is beneficial to adsorption of granulated magnesium desulphurization products and removal of desulphurization slag. According to the molten iron desulphurized by a two-step method, first-hit yield of desulphurization by blowing granulated magnesium is raised, and molten iron resulfurization in a converter is minimized. Thus, desulphurization cost during the whole molten iron desulphurization process is reduced.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a method for desulfurizing molten iron. Background technique [0002] At present, the main methods of desulfurization of molten iron in China are KR desulfurization, injection of granular magnesium desulfurization, and composite injection desulfurization. The desulfurization effect of the commonly used injection granular magnesium desulfurization method is average. The desulfurization cost of blowing desulfurization and KR desulfurization transformation methods is relatively high; facing the increasingly fierce competition in the steel market, there is an urgent need for a method that can not only have a higher desulfurization effect but also save desulfurization costs. Contents of the invention [0003] In order to solve the above technical problems, the present invention provides a method for desulfurizing molten iron, which solves the problems of insignificant desulfur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/02
Inventor 梁柏勇刘宇彭文涛王永江于文涛王东姜仁波
Owner BEIJING SHOUGANG CO LTD
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