Preparation method for refining slag for smelting bearing steel

A technology for refining slag and bearing steel, applied in the field of iron and steel metallurgy

Inactive Publication Date: 2015-12-16
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for bearing steel and other steels that have strict requirements on steel quality, the existing refining slag still needs to be greatly improved in terms of deoxidation, desulfurization, and control of the number, particle size, shape, and distribution of inclusions.

Method used

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  • Preparation method for refining slag for smelting bearing steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The slag components are: CaO38%, SiO 2 10%,Al 2 o 3 39%, MgO8%, CaF 2 5%, Ca / Al=1.0.

[0014] Taking the production of 1 ton of refining slag as an example, according to the composition of the slag system and the percentage by weight, use a weighing device to accurately weigh the mineral raw materials of each component. The weights are: lime 391.75kg, river sand 125.00kg, grade Bauxite 433.33kg, magnesite 160.00kg, fluorite 58.82kg. Use a crusher to crush the weighed raw materials and process them accordingly. Use a ball mill to fully mix the weighed components for 1.3 hours. Put the mixed slag material into the slag melting furnace, the initial temperature is 1330°C, and the slag material is completely melted. After the slag is completely melted, it is taken out and poured into the granulation tank for water quenching. After cooling, it is taken out, dried and stored in bags.

Embodiment 2

[0016] The slag system components are: CaO56%, SiO 2 5%,Al 2 o 3 28%,MgO5%,CaF 2 6%, Ca / Al=2.0.

[0017] Taking the production of 1 ton of pre-melted slag as an example, according to the composition of the slag system and the percentage by weight, the mineral raw materials of each component are accurately weighed with a weighing device. The weights are respectively: lime 577.32kg, river sand 62.50kg, a Grade bauxite 311.11kg, magnesite 100.00kg, fluorspar 70.59kg. Use a crusher to crush the weighed raw materials and process them accordingly. Use a ball mill to fully mix the weighed components for 1.2 hours. Put the mixed slag material into the slag melting furnace, the initial temperature is 1360°C, and the slag material is completely melted. After the slag is completely melted, it is taken out and poured into the granulation tank for water quenching. After cooling, it is taken out, dried and stored in bags.

Embodiment 3

[0019] The slag system components are: CaO40%, SiO 2 6%,Al 2 o 3 48%,MgO2%,CaF 2 4%, Ca / Al=0.8.

[0020] Taking the production of 1 ton of pre-melted slag as an example, according to the composition of the slag system and the percentage by weight, the mineral raw materials of each component are accurately weighed with a weighing device. The weights are respectively: lime 412.37kg, river sand 75.00kg, Grade bauxite 533.33kg, magnesite 40.00kg, fluorite 47.06kg. Use a crusher to crush the weighed raw materials and process them accordingly. Use a ball mill to fully mix the weighed components for 1.4 hours. Put the mixed slag material into the slag melting furnace, the initial temperature is 1350°C, and the slag material is completely melted. After the slag is completely melted, it is taken out and poured into the granulation tank for water quenching. After cooling, it is taken out, dried and stored in bags.

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Abstract

The invention relates to a preparation method for refining slag for smelting bearing steel. The slag system comprises components of, by mass, 38%-56% of CaO, 5%-12% of SiO2, 28%-48% of Al2O3, 2%-8% of MgO and 2%-6% of CaF2. The preparation method for the refining slag comprises the steps that, weighed fluorite, lime, bauxite, river sand and magnesite are treated and subjected to ball milling and mixed uniformly; then the mixture is put in a slag melting furnace to be heated, and slag materials are poured into a pelletization pond to be subjected to water quenching after being molten completely; and the slag materials are taken out to be dried, stored and packaged after being cooled. According to the preparation method for the refining slag for smelting the bearing steel, the refining slag prepared through the method is in an amorphous state and has the characteristics of being low in melting point, high in melting speed and the like; desulfuration can be performed efficiently and rapidly, inclusions in the steel are effectively adsorbed, and the problems of the high content, thick and big particles and the like of nonmetal inclusions in the traditional production process for the bearing steel are solved; the bearing steel has outstanding abrasion resistance and high fatigue strength, brittle fractures are reduced, the steel plasticity is improved, and the steel quality is guaranteed.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, in particular to a preparation method of refining slag for smelting bearing steel. Background technique [0002] With the continuous development of the national economy, bearing steel has penetrated into various sectors of the national economy and extended to many high-tech fields. The development of modern industry urgently needs high-quality bearing steel, which is required to have excellent wear resistance, fatigue strength, and reduce brittle fracture. This puts high demands on the cleanliness of the steel. It is required that the content of oxygen, sulfur and other trace harmful elements and non-metallic inclusions in the steel should be reduced to a very low level, and at the same time, the composition, size and shape of the inclusions can be controlled to ensure their plastic deformation ability. On the other hand, the modern steelmaking process is compact. In order to ensure the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076C21C7/064
CPCY02P10/20
Inventor 战东平邱国兴范坤牛奔张洋鹏郑瑶周永欣张慧书姜周华
Owner NORTHEASTERN UNIV
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