Slagging agent for iron and steel metallurgy

Abstract

The invention provides a slagging agent for iron and steel metallurgy, and relates to the technical field of iron and steel smelting. The slagging agent comprises the following components, by weight, 48% of F6, 12% of A12, 4-29% of Na4, S < 0.05%, P < 0.05%, H2O <= 1% and Fe 2O3 <= 1%. Products are mechanically pressed and formed and are granulated, granularity ranges from 5mm to 40mm, the pulverulent ratio is low, and the products are convenient to transport and store; the melting point of lime can be effectively reduced, and therefore the effects of slagging and fluxing are achieved; the fluorine content of the slagging agent is lower than the fluorine content of fluorite, therefore, environmental pollution is small, and the operating environment of workers is improved; the slagging agent is better in slagging effect compared with fluorite, molten steel temperature drop is small in the slagging process, and the slagging agent has the obvious effects for improving the quality of molten steel, shortening refining time, and reducing steel-making cost.

Description

technical field

[0001] The invention relates to the technical field of iron and steel smelting, in particular to a slagging agent for iron and steel metallurgy. Background technique

[0002] A certain amount of fluorspar should be added as a slag flux in the early stage of slagging in the LF furnace refining process, which is a conventional operation process of domestic and foreign steel mills. However, fluorite seriously erodes the refractory lining of the refining furnace, which leads to a reduction in the service life of the refining furnace, environmental pollution, and increased consumption of steel materials. In addition, due to the shortage of fluorite resources in recent years, the price of fluorite has increased to a certain extent, which has increased steelmaking enterprises. production cost. Contents of the invention

[0003] The object of the present invention is to provide a slagging agent for iron and steel metallurgy, which has a low melting point and a fas...

Examples

Embodiment 1

[0009] Embodiment 1: Prepare 1 ton of slag reducing agent.

[0010] Preparation method: Add 500Kg of various fluoride salts, and the rest are various aluminates, alumina, etc., mix the raw materials evenly, and press them into spherical shapes with a particle size of 5-40mm.

[0011] The slag-removing agent and fluorite balls used for LF refining are finely ground into powders with a particle size of 200 meshes, and the two powders are mixed with lime at a ratio of 1:4, 1:8, and 1:10, and the properties of various mixtures are measured. Melting temperature (hemispherical point method). The results show that the melting temperature of the slag-removing agent mixed with lime is lower than that of the mixture of fluorite and lime (in the same proportion as lime), about 20-50°C lower.

Embodiment 2

[0012] Embodiment 2: Industrial test of 120 tons of slagging agent.

[0013] When refining the LF furnace, lime and the slag agent of Example 1 are added together at a ratio of 4:0.8 (lime: fluorite = 4:1). The furnaces using the slag agent do not use fluorite, and the slag is reduced for 3 minutes. . Through industrial tests, it is observed that the slag-removing agent still has a good slag-removing effect when the added amount is only 80% of fluorite, and the slag-forming agent is fast in the refining process, and the molten steel has no temperature drop.

technical field

[0001] The invention relates to the technical field of iron and steel smelting, in particular to a slagging agent for iron and steel metallurgy. Background technique

[0002] A certain amount of fluorspar should be added as a slag flux in the early stage of slagging in the LF furnace refining process, which is a conventional operation process of domestic and foreign steel mills. However, fluorite seriously erodes the refractory lining of the refining furnace, which leads to a reduction in the service life of the refining furnace, environmental pollution, and increased consumption of steel materials. In addition, due to the shortage of fluorite resources in recent years, the price of fluorite has increased to a certain extent, which has increased steelmaking enterprises. production cost. Contents of the invention

[0003] The object of the present invention is to provide a slagging agent for iron and steel metallurgy, which has a low melting point and a fas...

Examples

Embodiment 1

[0009] Embodiment 1: Prepare 1 ton of slag reducing agent.

[0010] Preparation method: Add 500Kg of various fluoride salts, and the rest are various aluminates, alumina, etc., mix the raw materials evenly, and press them into spherical shapes with a particle size of 5-40mm.

[0011] The slag-removing agent and fluorite balls used for LF refining are finely ground into powders with a particle size of 200 meshes, and the two powders are mixed with lime at a ratio of 1:4, 1:8, and 1:10, and the properties of various mixtures are measured. Melting temperature (hemispherical point method). The results show that the melting temperature of the slag-removing agent mixed with lime is lower than that of the mixture of fluorite and lime (in the same proportion as lime), about 20-50°C lower.

Embodiment 2

[0012] Embodiment 2: Industrial test of 120 tons of slagging agent.

[0013] When refining the LF furnace, lime and the slag agent of Example 1 are added together at a ratio of 4:0.8 (lime: fluorite = 4:1). The furnaces using the slag agent do not use fluorite, and the slag is reduced for 3 minutes. . Through industrial tests, it is observed that the slag-removing agent still has a good slag-removing effect when the added amount is only 80% of fluorite, and the slag-forming agent is fast in the refining process, and the molten steel has no temperature drop.