Method for converting electric furnace into converter

A converter and electric furnace technology, which is applied in the field of smelting process control, can solve the problems of long smelting cycle and many harmful elements in scrap steel, and achieve the effects of short smelting cycle, reducing the content of five harmful elements, and improving service life.

Pending Publication Date: 2022-06-24
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The batching structure of electric furnace has all scrap mode, low iron ratio mode and high iron ratio mode, all scrap mode and low iron mode mainly rely on electric energy for smelting, the smelting cycle is longer, and there are more harmful elements in scrap steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Before batching, it is necessary to carefully check and confirm that the scrap steel entering the furnace must not contain oil, impurities, water, airtight containers, and explosives. Element. Lift the electrode to the highest position, unscrew the furnace cover, add scrap steel first, and then add molten iron. The speed of the process of adding molten iron is basically constant. %, molten iron temperature 1360 ℃.

[0028] After adding molten iron, oxygen blowing starts. Oxygen blowing is completed by the furnace door oxygen lance and the furnace wall oxygen lance. The first 2 minutes are in low oxygen mode, and the flow rate is 3200Nm. 3 / h, then turn on the medium and high oxygen mode, and the total oxygen supply flow of the oxygen lance remains 6000Nm 3 / h. The scrap steel was melted, the temperature was measured at 1550°C, and the samples were fully analyzed.

[0029] After the full melting result is reported, the carbon content is 1.13%, the P content is 0.020%...

Embodiment 2

[0035] Before batching, it is necessary to carefully check and confirm that the scrap steel entering the furnace must not contain oil, impurities, water, airtight containers, and explosives. Element. Lift the electrode to the highest position, unscrew the furnace cover, add scrap steel first, then add molten iron, and the process speed of adding molten iron is basically constant. %, molten iron temperature 1300 ℃.

[0036] After adding molten iron, oxygen blowing starts. Oxygen blowing is completed by the furnace door oxygen lance and the furnace wall oxygen lance. The first 2 minutes are in low oxygen mode, and the flow rate is 3200Nm. 3 / h, then turn on the medium and high oxygen mode, and the total oxygen supply flow of the oxygen lance is maintained at 6000m 3 / h. The scrap steel was melted, the temperature was measured at 1551°C, and the samples were fully analyzed.

[0037] After the full melting result is reported, the carbon content is 0.90%, the P content is 0.018...

Embodiment 3

[0043] Before batching, it is necessary to carefully check and confirm that the scrap steel entering the furnace must not contain oil, impurities, water, airtight containers, and explosives. Element. Lift the electrode to the highest position, unscrew the furnace cover, add scrap first, and then add molten iron. The speed of the process of adding molten iron is basically constant. %, molten iron temperature 1288 ℃.

[0044] After adding molten iron, oxygen blowing is started. Oxygen blowing is completed by the furnace door oxygen lance and the furnace wall oxygen lance. The total oxygen supply flow of the oxygen lance is maintained at 6000m. 3 / h. The scrap steel was melted, the temperature was measured at 1555°C, and the samples were fully analyzed.

[0045] After the full melting result is reported, the carbon content is 1.09%, the P content is 0.028%, and the total oxygen supply flow of the oxygen lance is maintained at 6000Nm 3 / h.

[0046]Intermittently inject lime p...

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PUM

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Abstract

The invention relates to the field of smelting process control, in particular to a method for converting an electric furnace into a converter. Comprising the following steps: (1) after the last furnace is smelted, the steel remaining amount in the furnace is 10-20% of the steel tapping amount, lifting an electrode to the highest position, screwing out a furnace cover, firstly adding waste steel, and adding molten iron accounting for 75-90% of the total steel material; (2) oxygen blowing is started after molten iron is added, in the first 2-5 minutes, a low-oxygen mode is started, the flow is 3000-3200 Nm < 3 > / h, then a medium-high-oxygen mode is started, the flow is about 4000-6000 Nm < 3 > / h, waste steel is melted down, the temperature is larger than or equal to 1540 DEG C, and sampling and total analysis are conducted; and after the tapping requirement is met, tapping is prepared. The proportion of the molten iron is high, the content of five harmful elements in the molten steel is effectively reduced, the cleanliness of the molten steel is improved, and the quality of steel is effectively improved.

Description

technical field [0001] The invention relates to the field of smelting process control, in particular to a method for converting an electric furnace into a furnace. Background technique [0002] The batching structure of the electric furnace has a full scrap mode, a low molten iron ratio mode and a high molten iron ratio mode. The full scrap mode and the low molten iron mode mainly rely on electric energy for smelting, the smelting cycle is long, and there are many residual harmful elements in the scrap. At present, with the popularity of large blast furnaces in the metallurgical industry, the ingredients of electric furnaces have also begun to be mixed with some molten iron. Due to the excess of molten iron, the proportion of molten iron added into electric furnaces is relatively high. , many furnaces no longer need to send electricity, only need to blow oxygen. Realized zero power consumption smelting, forming a de facto electric furnace converter operation. It can not on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52
CPCC21C5/52C21C5/527
Inventor 张海霞梁建国
Owner SHANDONG IRON & STEEL CO LTD
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