Method for removing manganese from molten iron in top and bottom combined blown convertor

A top-bottom combined blowing and molten iron technology, which is applied in the field of demanganization of converter molten iron, can solve the problems of high manganese content and cannot meet the requirements of demanganization, and achieve the effect of high demanganization efficiency, low price and wide source

Inactive Publication Date: 2012-07-11
HEBEI SHOUGANG QIAN AN IRON & STEEL CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This method is based on two converters, one for dephosphorization of molten iron and one for decarburization, and the manganese co

Method used

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  • Method for removing manganese from molten iron in top and bottom combined blown convertor
  • Method for removing manganese from molten iron in top and bottom combined blown convertor
  • Method for removing manganese from molten iron in top and bottom combined blown convertor

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Embodiment Construction

[0034] The experiment was carried out in a 210-ton top-bottom combined blowing converter. The amount of molten iron, steel scrap, and manganese removal agent added is shown in Table 1, and the composition of molten iron at different stages is shown in Table 2. First load light thin steel scrap and undemanganized hot metal, adjust the blowing oxygen lance position, start blowing, and then add the first batch of demanganization agent (lime, iron ore) into the converter through the hopper above the converter. The oxygen lance position and oxygen flow rate changes during blowing process are as follows: figure 1 As shown, observe the furnace gas analysis curve, when the CO curve starts to rise continuously (such as figure 2 As shown), lift the gun to dump the slag, and the amount of slag dumped is not less than 60% of the total slag. Lime, iron ore and fluorite) are added into the converter, and the oxygen lance position and oxygen flow change as follows: figure 1 shown. After ...

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Abstract

The invention discloses a simple, efficient and low-cost method for removing manganese from molten iron in a top and bottom combined blown convertor. The final manganese content of the convertor is controlled to be less than 0.05 weight percent. The method comprises the following specific steps of: adding steel scrap into the convertor, adding the molten iron into the convertor, adding a demanganization agent into the liquid level of the molten iron, supplying oxygen to the liquid level of the molten iron by using an oxygen lance from the top, supplying stirring gas into the molten iron from the bottom, monitoring the CO content of converter gas, and pouring initial slag out when the inhibition of the carbon oxidation is converted into intense carbon oxidation, wherein the amount of poured slag is not less than 60 percent of the total slag amount; and adding the demanganization agent into the liquid level of the molten iron. Compared with the conventional method for removing manganese by a common blowing process or a convertor duplex manganese removal process, the method has the advantages that: special manganese removal equipment is not required, a mature top and bottom combined blown convertor blowing technology is fully utilized, and the dynamical condition for removing manganese from the molten iron is fully met, the common demanganization agent used as the raw material is used, sources are wide, and price is low.

Description

technical field [0001] The invention relates to a method for demanganization of molten iron, in particular to a method for demanganization of molten iron in a converter. Background technique [0002] High-grade oriented silicon steel has very strict requirements on manganese content in steel products. In order to meet the quality requirements of high-grade oriented silicon steel, it is necessary to remove manganese in molten iron as much as possible during the pretreatment of molten iron and the process of converter steelmaking. The requirement for manganese at the end of the converter is ≤0.05 % parts by weight. In the traditional demanganization of molten iron, a special manganese removal agent is often added to the torpedo tank or iron ladle, and the demanganization effect is achieved by spraying or stirring, but this method requires special spraying or stirring equipment and consumes a large amount of manganese removal agent, and the cost is high , and lose part of the ...

Claims

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Application Information

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IPC IPC(8): C21C1/04
CPCY02P10/20
Inventor 南晓东张立国赵艳宇刘珍童周立武宋春明王春雪孙铁孙亮
Owner HEBEI SHOUGANG QIAN AN IRON & STEEL CO LTD
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