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Converter slag mending material

A technology for converter slag and charging material, applied in the direction of manufacturing converters, etc., can solve the problems of non-conversion and slag refractory, and achieve the effects of not polluting the environment, reducing iron loss, and saving slag splashing time.

Inactive Publication Date: 2011-11-09
河南新锦新材料有限公司
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Problems solved by technology

[0004] In this way, the three-high concept of "high-purity raw materials, high-pressure molding, and high-temperature firing" advocated by the Japanese is completely negated. Although the slag-splashing furnace is a very good and successful technology, it is still not a perfect technology. , that is, after each furnace of steel is smelted, 2 to 3 minutes (small furnace) and 3 to 5 minutes (large furnace) must be sacrificed for slag splashing operation, so that the effective steelmaking time is almost reduced by 1 / 5 to 1 / 4, and Only the viscosity of the changed slag slows down the solvent effect of FeO on the melting point of the slag, but does not really make the slag more refractory

Method used

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Embodiment

[0027] Example : 1.5 tons of slag (with FeO content of 10%) is left as a repairing material after the steel is tapped, and a silicon-calcium alloy (32% of Ca content, 65% of Si content) is used as a reducing agent for repairing operation:

[0028] 1.5 tons of slag contains FeO=150Kg= =2083.33molFeO

[0029] There are Ca+FeO=CaO+Fe and Si+2FeO=SiO 2 +2Fe knowable

[0030] 40 grams of Ca can reduce 1 mol FeO, 14 grams of Si can reduce 1 mol FeO

[0031] The amount of FeO that can be reduced per Kg silicon calcium = + =54.43molFeO

[0032] FeO in 1.5 tons of slag is just reduced and needs silicon calcium weight = =38.275 (kg)

[0033] According to the excess of reducing agent 5% ~ 10%:

[0034]The amount of silicon calcium added = 38.275 × (1 + 5% ~ 10%) = 40.19 ~ 42.10 (kg)

[0035] Therefore, if 1.5 tons of slag with a FeO content of 10% is left, the calcium-silicon alloy (Ca 32、 Si 65 ) is added in an amount of about 41 to 42Kg, and a better repairing effe...

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Abstract

The invention discloses a converter slag mending material which is mainly characterized in that: in the converter smelting process, the sigma FeO in the converter slag is controlled to 8%-12%; a reductant active metal or alloy thereof is added in the slag after tapping, so that all of FeO in the slag is reduced, and a slag system material is turned into a CaO-SiO2 binary system or CaO-MgO-SiO2 ternary system refractory material; and the refractory material is adhered on a furnace wall through rocking a furnace or N2 splashing, thereby achieving the fettling purpose. Because the technical scheme is adopted in the invention, compared with the prior art, the converter slag mending material has the advantages that operation is simple, practicable and rapid and the effect is good.

Description

[0001] technical field [0002] The invention belongs to the technical field of refractory materials for steelmaking, and relates to a process of using active metal as a reducing agent to modify converter slag and then make furnace repair charge, in particular to a converter slag repair charge. Background technique [0003] Since the birth of the first converter in 1956, more than 80% of the steel has been smelted by converters. Before the 1970s, the refractory materials used in converters ranged from magnesia bricks to dolomite bricks to oil-impregnated dolomite bricks. In 200-400 furnaces. In the mid-1970s, Akira Watanabe of Japan invented magnesia-carbon bricks to increase the furnace life of the converter to about 1500 times, which caused a huge sensation for a while, and magnesia-carbon bricks became popular all over the world. In the 1990s, the American LTV company took the lead in adding light-burned MgO or dolomite to the slag-making materials of converter steelmak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36C21C5/28C04B35/66
Inventor 李明建李明君李烈钧董国防李烈选宋金峰
Owner 河南新锦新材料有限公司
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