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An environmentally friendly molten steel refining flux slag

A technology for assisting slag and shaped steel, which is applied in the field of iron and steel smelting, can solve the problems of reducing the service life of ladles, increasing processing costs, and corrosion of ladle linings, and achieves the effects of avoiding pollution, shortening the time of slag change, and slowing down erosion

Active Publication Date: 2015-10-28
营口联众冶金技术有限公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this slagging method are: the slagging time is long, generally more than 20 minutes, resulting in an increase in processing costs; at the same time, fluorite has an erosive effect on the ladle lining, reducing the service life of the ladle; the use of fluorite slagging is also harmful to the environment. create pollution
[0004] In addition, enterprises producing magnesia refractory materials produce a large amount of magnesium tailings, which also pollute the environment and cause a waste of magnesium resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Environment-friendly molten steel refining flux slag, which is made of the following raw materials in proportion by weight,

[0021] 0.5 parts of boron slag, 0.5 parts of magnesium tailings powder,

[0022] 0.5 parts of dolomite powder, 0.5 parts of bauxite powder,

[0023] Sodium silicate 0.02 parts.

[0024] Technical indicators of boron slag: B 2 o 3 The content is 2.5%.

[0025] Technical indicators of magnesium tailings: MgO 42.5%, SiO 2 3.54%, P 0.018%, S 0.025%.

[0026] Technical index of dolomite powder: CaCO 3 52%, MgCO3 41%, SiO 2 1.5%, P 0.005%, S 0.023%.

[0027] Technical indicators of bauxite powder: Al 2 o 3 79%, Fe 2 o 3 1.8%.

[0028] The particle size of boron slag, dolomite powder and bauxite powder is less than 5mm.

[0029] (2) The preparation method of the environment-friendly molten steel refining flux slag is as follows:

[0030] 1) Dry the boron slag at 150-300°C for 3 hours to drain the moisture and control the moistu...

Embodiment 2

[0037] (1) Environment-friendly molten steel refining flux slag, which is made of the following raw materials in proportion by weight,

[0038] 0.3 parts of boron slag, 1.0 parts of magnesium tailings,

[0039] 0.6 parts of dolomite powder, 0.3 parts of bauxite powder,

[0040] Sodium silicate 0.01 part.

[0041] Technical indicators of boron slag: B 2 o 3 The content is 2.0%.

[0042] Technical indicators of magnesium tailings: MgO 43.5%, SiO 2 3.44%, P 0.015%, S 0.020%.

[0043] Technical index of dolomite powder: CaCO 3 52.5%, MgCO 3 43%, SiO 2 1.3%, P 0.004%, S 0.023%.

[0044] Technical indicators of bauxite powder: Al 2 o 3 78.5%, Fe 2 o 3 1.5%.

[0045] The particle size of boron slag, dolomite powder and bauxite powder is less than 5mm.

[0046] (2) The preparation method of the environment-friendly molten steel refining flux slag is as follows:

[0047] 1) Dry the boron slag at 150-300°C for 3 hours to drain the moisture and control the moistur...

Embodiment 3

[0054] (1) The environmentally friendly molten steel refining flux slag is made of the following raw materials in proportion by weight,

[0055] 1.0 parts of boron slag, 0.3 parts of magnesium tailings,

[0056] 0.3 parts of dolomite powder, 0.8 parts of bauxite powder,

[0057] Sodium silicate 0.1 parts.

[0058] Technical indicators of boron slag: B 2 o 3 The content is 2.7%.

[0059] Technical indicators of magnesium tailings: MgO 43%, SiO 2 3.5%, P 0.016%, S 0.025%.

[0060]Technical index of dolomite powder CaCO 3 53%, MgCO3 42.5%, SiO 2 1.55%, P 0.006%, S 0.020%.

[0061] Technical indicators of bauxite powder: Al 2 o 3 80%, Fe 2 o 3 2.0%.

[0062] The particle size of boron slag, dolomite powder and bauxite powder is less than 5mm.

[0063] (2) The preparation method of the environment-friendly molten steel refining flux slag is as follows:

[0064] 1) Dry the boron slag at 150-300°C for 3 hours to drain the moisture and control the moisture to le...

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Abstract

The invention relates to environment-friendly molten steel refining fluxing slag. The technical scheme is that the environment-friendly molten steel refining fluxing slag is prepared from the following raw materials in parts by weight: 0.3-1.0 part of boron rock slags, 0.3-1.0 part of magnesium tailings, 0.3-0.6 part of dolomite dust, 0.3-0.8 part of bauxite powder and 0.01-0.1 part of sodium silicate. The preparation method of the environment-friendly molten steel refining fluxing slag comprises the following steps: drying the boron rock slags and removing moisture; uniformly mixing the dried boron rock slags, magnesium tailings, dolomite dust and bauxite powder in parts by weight; and adding water glass into the uniformly mixed material to press balls and dry. According to the invention, the waste boron rock slags and the magnesium industrial waste magnesium tailings are fully utilized, so that not only is the production cost lowered, but also the environment is protected and the slag-converting time is shortened.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a new material added to molten steel to improve the refining effect when the molten steel in a steelmaking plant is processed in an out-of-furnace refining device. Background technique [0002] Before the molten steel in the steel plant is cast, it generally needs to be refined. The commonly used method is: the molten steel is pretreated in the refining device outside the furnace (LF furnace), adding slagging materials such as fluorite to the LF furnace, and the fluorite is used to speed up the melting of the refining flux to complete the task of molten steel refining. The disadvantages of this slagging method are: the slagging time is long, generally more than 20 minutes, resulting in an increase in processing costs; at the same time, fluorite has an erosive effect on the ladle lining, reducing the service life of the ladle; the use of fluorite slaggi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/076
CPCY02P10/20
Inventor 谢磊王志英
Owner 营口联众冶金技术有限公司
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