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Recycling method of refining white slag

A technology of white slag and slagging agent, which is applied in the direction of recycling technology and improvement of process efficiency, etc., can solve problems such as waste of resources, achieve the effects of reducing solid waste emissions, reducing refining power consumption, and reducing the quality of molten steel

Inactive Publication Date: 2015-03-11
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the early stage of LF refining, slagging agent fluorite or bauxite must be added in order to quickly form slag and submerged arc to heat up. After fluorite decomposes, it will produce fluorine-containing gas that is harmful to human body, while bauxite will cause waste of resources.

Method used

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  • Recycling method of refining white slag

Examples

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Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: The recycling method of this refined white slag (steel type Q345B 120 tons of molten steel / steel), the specific steps are as follows:

[0021] (1) The ladle temperature is 1558°C when the primary furnace is tapped, the ladle is well blown with argon, and the free space is 600mm. It is directly poured into the upper furnace and poured into the liquid refining white slag of 720kg. Sampling before pouring the refining slag C: 0.063%, S: 0.037%;

[0022] (2) LF refining: 700kg of lime, 1800kg of silicon-manganese alloy, 300kg of calcium carbide, 50kg of silicon carbide, yellow and white slag are added within 10 minutes after the refining seat is powered on, and the temperature is measured at 1547°C by power cut. Minute sampling: C: 0.085%, S: 0.029%; continue power supply for 15 minutes, add 400kg of lime, 550kg of silicon-manganese alloy, 100kg of ferrosilicon powder, cut off power and measure temperature at 1608°C, blow argon for 2 minutes. Sampling: C: 0.13...

Embodiment 2

[0023] Embodiment 2: The recycling method of this refined white slag (steel type Q345B 120 tons of molten steel / steel), the specific steps are as follows:

[0024] (1) The ladle temperature at the end of the primary smelting furnace is 1549°C, the ladle is well blown with argon, the free space is 500mm, and the sampling C: 0.067%, S: 0.042%;

[0025] (2) After the LF refining seat bag is powered on, first add 480kg of solid refining white slag, then add 600kg of lime, 1800kg of silicon-manganese alloy, 300kg of calcium carbide, 50kg of silicon carbide, and yellow and white slag. Aluminum wire 600m, argon blowing for 1 minute sampling: C: 0.078%, S: 0.031%; continue to power on for 15 minutes, add lime 500kg, silicomanganese alloy 600kg, ferrosilicon powder 80kg, cut off power and measure temperature at 1602℃, blow argon Sampling in 2 minutes: C: 0.147%, S: 0.009%; continue power supply for 8 minutes, add 200kg of lime, cut off power and measure temperature at 1639°C, sampling:...

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Abstract

The invention discloses a recycling method of refining white slag, the method is as follows: the white slag is added, before a slagging agent, into the molten steel which is refined or ready to refine; refined lime melting point is 2614DEG C, only after the addition of fluorite, aluminum bauxite and other slagging agent, the melting point can be reduced for slow slagging, the fluorite dosage is about 2kg per ton of steel, aluminum bauxite dosage is about 3kg per ton of steel; and after the recycled white slag is added, the part of the material can be completely or partially replaced. The method makes full use of the low melting point characteristic of the refining white slag, the rate of slag formation is improved, refining energy consumption is reduced, the problems of high treatment cost and large environmental pollution of the refining white slag can be effectively solved, refining electricity and refining lime and fluorite and other slagging agent consumption can be reduced, the molten steel quality is not reduced, at the same time, the method can reduce waste emissions, reduce air pollution, and effectively reduce the production cost, and has the characteristics of energy saving and environmental protection and low cost.

Description

technical field [0001] The invention relates to a method for recycling metallurgical waste, in particular to a method for recycling refining white slag. Background technique [0002] my country's steel production capacity has reached 900 million tons. With the gradual improvement of users' requirements for the internal quality of steel, refining has become an indispensable process, and a large amount of solid waste refining white slag will be produced. Refined white slag is pulverized when it encounters moisture in the air, causing great dust pollution to the environment. The traditional treatment method of refining white slag is landfill, which generates a lot of transportation and landfill costs. In the early stage of LF refining, slagging agent fluorspar or bauxite must be added in order to quickly form slag and submerged arc to heat up. After fluorite decomposes, it will produce fluorine-containing gas that is harmful to human body, and bauxite will cause waste of resou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/04C21C7/076
CPCC21B3/04C21C7/076Y02P10/20Y02W30/50
Inventor 李惠勇
Owner WUYANG IRON & STEEL
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