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Method for reducing semisteel steel-making final slag total iron content

A technology of iron content and final slag, applied in the field of metallurgy, can solve the problem of high cost, achieve low cost, reduce steelmaking cost, and reduce obvious effects

Active Publication Date: 2015-07-08
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composition of the modifier is fixed, aluminum and other expensive metals are used as the main raw materials, and the added amount is 1 / 4 of the total slag, and the cost is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The 120t converter of a factory uses semi-steel steelmaking. The oxygen activity of the molten steel measured by the sub-gun TSO probe at the end of the smelting of the converter is 621ppm. According to the oxygen activity of the molten steel, 240kg of magnesium carbon balls are added to the furnace through the silo (the composition of the magnesium carbon balls is : MgO 40%, CaO 40%, C 10%, the rest is a small amount of impurities; particle size: 20 ~ 40mm), using the top gun to blow nitrogen for 20s, the nitrogen blowing intensity is 3m 3 / t·min, the working pressure is 0.6Mpa, the position of the blowing gun is 2.1m, and the steel is tapped after standing still for 60s after nitrogen blowing, and the TFe content in the steel slag is only 17.2% according to sampling analysis.

Embodiment 2

[0027] A 200t converter in a factory uses semi-steel steelmaking. The oxygen activity of the molten steel measured by the sub-gun TSO probe at the end of the converter smelting is 796ppm. After adding 600kg of magnesium carbon balls into the furnace through the feed bin (the composition of magnesium carbon balls is: MgO 50%, CaO 35%, C 8%, the rest is a small amount of impurities; particle size: 20 ~ 40mm), use the top gun to blow nitrogen for 30s, and the nitrogen blowing intensity is 3.2m 3 / t·min, the working pressure is 0.7Mpa, the position of the blowing gun is 1.9m, and the steel is tapped after standing still for 90s after nitrogen blowing, and the TFe content in the steel slag is only 17.8% according to sampling analysis.

Embodiment 3

[0029] A 120t converter in a factory uses semi-steel steelmaking. The oxygen activity of the molten steel measured by the sub-lance TSO probe at the end of the converter smelting is 869ppm. After adding 360kg of magnesium carbon balls into the furnace through the feed bin (the composition of magnesium carbon balls is: MgO 50%, CaO 30%, C 9%, the rest is a small amount of impurities; particle size: 20 ~ 40mm), using the top gun to blow nitrogen for 35s, the nitrogen blowing intensity is 3.5m 3 / t·min, the working pressure is 0.8Mpa, the blowing gun position is 1.8m, and the steel is tapped after standing still for 100s after nitrogen blowing. The TFe content in the steel slag is only 17.1% according to sampling analysis.

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Abstract

The invention relates to a method for reducing semisteel steel-making final slag total iron content and belongs to the technical field of metallurgy. The invention aims at providing the method for reducing the semisteel steel-making final slag total iron content. The method comprises the following steps: adding a magnesium carbon ball after finishing semisteel converter smelting, performing top-blowing nitrogen for 20-50s, standing for 60-120s after finishing nitrogen blowing, and tapping. By adopting the method, the semisteel steel-making converter final slag TFe content is controlled within 18%, the final slag TFe is obviously reduced and the effect is obvious, additionally the method is simple in operation, few in magnesium carbon ball dosage and low in cost.

Description

technical field [0001] The invention relates to a method for reducing the total iron content of semi-steelmaking final slag, belonging to the technical field of metallurgy. Background technique [0002] With the continuous decline in the profits of steel products, cost reduction has become the focus of major steel companies. Reducing the content of total iron (TFe) in the final slag is an important technical means to reduce the consumption of iron and steel materials and reduce the cost of converter smelting. However, for steel mills that use semi-steel for steelmaking, due to the low carbon content (3.4-4.0%) in the semi-steel after vanadium extraction, the content of silicon and manganese heating elements in the semi-steel are all traces, and the slag is a component Single, slagging speed is slow, compared with ordinary molten iron steelmaking, the total iron content in the slag at the end of semi-steel steelmaking is higher (22-25%), and the iron loss is greater. Theref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36
Inventor 陈均曾建华梁新腾杨森祥张彦恒黄德胜陈路
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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