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Application of preprocessed molten iron in electric steelmaking

An electric furnace steelmaking and pretreatment technology, applied in electric furnaces, furnaces, furnace types, etc., can solve the problems of inability to improve production capacity, large splash, and large decarburization amount.

Inactive Publication Date: 2007-11-21
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The large amount of decarburization during the oxygen melting period not only increases the oxygen consumption, but also prolongs the smelting time, and the production capacity still cannot be improved
And it is easy to cause a large splash, causing many adverse consequences

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1 Hot metal pretreatment

[0032] With 24t common molten iron, temperature is 1320 ℃, and main component (weight %) is

[0033] C 3.80-4.20 Si 0.601.00 S≤0.070 P≤0.070

[0034] The rest are unavoidable impurities and Fe

[0035] Poured deposit is 17m 3 300kg of lime is added to the molten iron preprocessor, and a 7500mm long three-hole Laval water-cooled oxygen lance is used. With a pressure of 0.7Mpa, 2450m 3 Oxygen is blown in at a flow rate of / h, and then 1000-1200 kg of lime and 200 kg of dolomite are added in batches. The cooling water flow rate throughout the process is 40t / h, and the temperature of the molten iron reaches 1650°C after processing for 20 minutes. After analyzing the composition of the molten iron (%) When the following requirements are met

[0036] C 2.00-2.50 Si ≤ 0.20 S ≤ 0.050 P ≤ 0.050

[0037] All the other are unavoidable impurity and Fe, promptly handle the said pretreatment molten iron of the present invention.

[0038] 2 into the el...

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PUM

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Abstract

The application of the pretreated liquid iron in electric steelmaking comprises: adding liquid iron and 1.08-1.36wt% CaCO3 into the liquid iron preprocessor; blowing oxygen for 6-15min, adding in turn 4.0-4.5wt% CaCO3 and 0.7-0.85% dolomite, blowing oxygen on pressure of 0.6-0.8MPa for 16-20min while the liquid iron comes up to 1650Deg and contains 2.00-2.50% C, Si<=0.20, S<=0.050, P<=0.050 and other unnecessary impurity; adding 35-38 pretreated liquid iron, 25-38 common liquid steel and 35-38 waste liquid into the electric furnace to blow oxygen and melt till up to some standard. Compared with prior art, this invention cuts time with less energy.

Description

technical field [0001] The invention relates to an application method of molten iron in electric furnace steelmaking. Background technique [0002] The raw materials for electric furnace smelting are generally scrap steel and molten iron, and the ratio of scrap steel to molten iron is 5-6 scrap steel and 4-5 molten iron. Generally, there are 35-42 tons of scrap steel in each furnace, 28-35 tons of molten iron, and the total loading of steel materials is 70 tons. Due to the large amount of cold material scrap steel, the amount of molten iron mixed in is small and the temperature is low. , the molten pool cannot be formed in the electric furnace. Therefore, in the early stage of the electric furnace, the oxygen lance cannot be inserted in time to blow oxygen to carry out intensified smelting, so the power transmission time is prolonged, the power consumption is increased, the smelting time is longer, and the production capacity of the electric furnace equipment cannot be full...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52C21C7/00
CPCY02P10/20
Inventor 罗红卫郝旭明杜俊明兰惠明康卫珍
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD