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Smelting technology for increasing element utilization rate

A utilization rate and process technology, applied in the smelting process field of improving element utilization rate, can solve the problems of large consumption of reduced ferrosilicon, serious chromium loss, high gas content in steel, and achieve the effect of improving utilization rate

Inactive Publication Date: 2015-12-09
黄顺所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: 1. The service life of the furnace lining is short; 2. The consumption of reduced ferrosilicon is large; 3. At present, ultra-low C, ultra-low nitrogen, and stainless steel cannot be produced, and the gas content in the steel is relatively high; 4. The consumption of argon is large
The traditional method is to smelt stainless steel through the process of EAF-AOD-LF-CC / IC. In the EAF process, the chromium content in the slag reaches more than 12%, and the chromium loss is relatively serious.

Method used

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  • Smelting technology for increasing element utilization rate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The smelting process to improve the utilization rate of elements, the process steps are as follows:

[0023] 1. Ingredients: on the basis that the addition of various elements meets the requirements, the amount of silicon is controlled at 0.65%, and the amount of carbon is controlled at 1.8%;

[0024] 2. Slagging: The amount of lime added is 800kg, which is added in the early stage to quickly form slagging, and the alkalinity of the slag is controlled at 1.4;

[0025] 3. Smelting: Oxygen blowing is strictly prohibited in the first two tanks of the smelting process, the whole process is powered on, the furnace door is kept closed, and 20kg of silicon carbide is added to the furnace before oxygen blowing and melting in the later stage;

[0026] 4. Reduction: when the furnace charge is completely melted, when the temperature reaches 1590°C, add 40kg of silicon carbide, close the furnace door, and power on for 4 minutes;

[0027] 5. Tapping: Open the tapping hole, let the ...

Embodiment 2

[0031] The smelting process to improve the utilization rate of elements, the process steps are as follows:

[0032] 1. Ingredients: on the basis that the addition of various elements meets the requirements, the amount of silicon added is controlled at 0.70%, and the amount of carbon added is controlled at 1.9%;

[0033] 2. Slagging: The amount of lime added is 800kg, added in the early stage to quickly form slagging, and the alkalinity of the slag is controlled at 2.0;

[0034] 3. Smelting: Oxygen blowing is strictly prohibited in the first two tanks of the smelting process, the whole process is energized, the furnace door is kept closed, and 30kg of silicon carbide is added to the furnace before oxygen blowing and melting in the later stage;

[0035] 4. Reduction: all the furnace materials are melted, and when the temperature reaches 1580°C, add 40kg of silicon carbide, close the furnace door, and power on for 4 minutes;

[0036] 5. Tapping: Open the tapping hole, let the mo...

Embodiment 3

[0040] The smelting process to improve the utilization rate of elements, the process steps are as follows:

[0041] 1. Ingredients: on the basis that the addition of various elements meets the requirements, the amount of silicon added is controlled at 0.80%, and the amount of carbon added is controlled at 2.0%;

[0042] 2. Slagging: The amount of lime added is 1000kg, which is added in the early stage to quickly form slagging, and the alkalinity of the slag is controlled at 1.6;

[0043] 3. Smelting: Oxygen blowing is strictly prohibited in the first two tanks of the smelting process, the whole process is powered on, the furnace door is kept closed, and 20kg of silicon carbide is added to the furnace before oxygen blowing and melting in the later stage;

[0044]4. Reduction: all the furnace materials are melted, and when the temperature reaches 1580, add 60kg of silicon carbide, close the furnace door, and power on for 3 minutes;

[0045] 5. Tapping: Open the tapping hole, le...

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Abstract

The invention discloses a smelting technology for increasing the element utilization rate. The technology includes the following sequential smelting steps that the supplying amount of silicon and the supplying amount of carbon are controlled, lime is added into each electric furnace, and the basicity of slag is controlled; oxygen blowing is not conducted before smelting, electricity is supplied during the whole process to keep furnace doors closed, and silicon carbide is added into the furnaces before oxygen blowing melting accelerating in the later stage; furnace burdens are wholly melted down, the temperature is increased, silicon carbide is added, the furnace doors are closed, and electricity is supplied; and molten steel and the furnace slag are flushed into a steel ladle together, and the slag is adjusted until the molten steel is discharged totally. According to the smelting technology for increasing the element utilization rate, the supplying amount of the silicon and the supplying amount of the carbon are controlled in burdening, lime is added in the slag making process, and the basicity of the slag is controlled; and the silicon carbide is added in the smelting process, the reduction process and the molten steel tapping process, the chromium content in the slag is reduced, and the utilization rate of the chromium element is increased.

Description

technical field [0001] The invention belongs to the technical field of smelting and relates to a smelting process, in particular to a smelting process for improving the utilization rate of elements. Background technique [0002] There are currently three methods of smelting stainless steel in the world. One: That is, the electric furnace smelts stainless steel in one step. Due to the one-step method has strict requirements on raw materials (stainless steel scrap, low-carbon ferrochrome and metal chromium need to be returned), the consumption of raw materials and energy media in production is high, the cost is high, the smelting cycle is long, the productivity is low, the product variety is small, the quality is poor, and the life of the furnace lining is long. Short, high consumption of refractory materials, so this method is rarely used to produce stainless steel. Two: VOD and AOD refining devices have played a decisive role in the transformation of stainless steel produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52
CPCY02P10/20
Inventor 黄顺所
Owner 黄顺所
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