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A method for using refining slag for converter smelting

A technology of refining slag and converter smelting, which is applied in the field of iron and steel smelting, and can solve problems such as inability to realize recycling, unsatisfactory recycling rate, and potential safety hazards

Active Publication Date: 2020-11-17
TIANJIN TIANGANG UNITED SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the refining slag is used in the steelmaking process, one disposal method is to pour the slag into the slag basin through the ladle, and transport it to the slag storage workshop by car to become waste slag. This method is a conventional disposal method and basically cannot be recycled; Another solution is to pour the hot slag into the new ladle by using the crane after the molten refining slag is used up, so as to realize secondary utilization. This kind of solution has certain safety hazards and more damage to the on-site production rhythm. In the process of production practice, the recycling rate is not ideal

Method used

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  • A method for using refining slag for converter smelting
  • A method for using refining slag for converter smelting
  • A method for using refining slag for converter smelting

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Effect test

Embodiment 1

[0019] The operation method of the above-mentioned refining slag in converter smelting comprises the following steps:

[0020] Step 1. Adjusting the composition of refining slag: After the continuous casting pouring is completed, a certain amount of lightly burned magnesium balls are manually added into the ladle from the continuous casting platform. The content of MgO in the lightly burned magnesium balls is 60wt%, and the quantity is 0.4 kg / tons, thereby increasing the MgO content of the slag to meet the requirement that the MgO content during converter smelting be 7-8wt%;

[0021] Step 2. Refining slag cooling: Pour the hot refining slag into the slag basin using a crane, and transport it to the slag storage workshop by car to cool the slag naturally;

[0022] Step 3. Screening of refining slag: The cooled refining slag presents two forms of block and powder, and is screened. The screening specifications are 80*80mm and 30*30mm, and the screening specifications are between...

Embodiment 2

[0036] The operation method of the above-mentioned refining slag in converter smelting comprises the following steps:

[0037] Step 1. Adjusting the composition of refining slag: After the continuous casting pouring is completed, a certain amount of light-burned magnesium balls are manually added into the ladle from the continuous casting platform. The MgO content in the light-burned magnesium balls is 61wt%, and the quantity is 0.6 kg / tons, so as to increase the MgO content of the slag and meet the requirement that the MgO content of the converter smelting be 7-8wt%;

[0038] Step 2. Refining slag cooling: Pour the hot refining slag into the slag basin using a crane, and transport it to the slag storage workshop by car to cool the slag naturally;

[0039] Step 3. Screening of refining slag: The cooled refining slag presents two forms of block and powder, and is screened. The screening specifications are 80*80mm and 30*30mm, and the screening specifications are between 30-80m...

Embodiment 3

[0053] The operation method of the above-mentioned refining slag in converter smelting comprises the following steps:

[0054] Step 1. Adjusting the composition of refining slag: After the continuous casting pouring is completed, a certain amount of lightly burned magnesium balls are manually added into the ladle from the continuous casting platform. The MgO content in the lightly burned magnesium balls is 62wt%, and the quantity is 0.8 kg / tons, thereby increasing the MgO content of the slag and meeting the requirement that the MgO content of the converter smelting be 8-9 wt%;

[0055] Step 2. Refining slag cooling: Pour the hot refining slag into the slag basin using a crane, and transport it to the slag storage workshop by car to cool the slag naturally;

[0056] Step 3. Screening of refining slag: The cooled refining slag presents two forms of block and powder, and is screened. The screening specifications are 80*80mm and 30*30mm, and the screening specifications are betwe...

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Abstract

The invention relates to the field of iron and steel smelting, in particular to a method for using refining slag for converter smelting. The main components of the refining slag are CaO: 55-60wt%, SiO 2 :20~30wt%, AL 2 o 3 : 4~6wt%, MgO: 4~6wt%, FeO: 0.5~1.5wt%, MnO<0.5wt%, P 2 o 5 <0.035wt%, S: 0.3~1.0wt%. Refining slag is recovered after continuous casting and pouring. After cooling and screening, slag of different specifications is fed into the converter respectively, and a suitable oxygen blowing system is used. The invention can not only achieve high-efficiency recovery of refining slag, but also improve the heat utilization efficiency of the converter, which helps to improve the stability of converter smelting; realizes rapid deoxidation and desulfurization and adsorption of inclusions, and exerts better metallurgical properties of pre-melted slag.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and in particular relates to a method for using refining slag for converter smelting. Background technique [0002] Refining process The traditional slag-making process is to use lime, fluorite, bauxite, etc. to make slag. The main function of the slag is to absorb harmful impurities in molten steel and realize metallurgical functions such as deoxidation and desulfurization. The state exists, and the slag is nearly completely pulverized during cooling to room temperature. After the refining slag is used in the steelmaking process, one disposal method is to pour the slag into the slag basin through the ladle, and transport it to the slag storage workshop by car to become waste slag. This method is a conventional disposal method and basically cannot be recycled; Another solution is to pour the hot slag into the new ladle by using the crane after the molten refining slag is used up, so as to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C7/076
CPCC21C5/28C21C7/076Y02P10/20
Inventor 崔猛阚永海邓志勇任茂勇王飞宇张文政马桂芬
Owner TIANJIN TIANGANG UNITED SPECIAL STEEL CO LTD
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