Preparation method of composite phase combined magnesium-base unshaped refractory material applied to bottom of electric furnace

Abstract

The invention relates to a preparation method of a composite phase combined magnesium-base unshaped refractory material applied to the bottom of an electric furnace. The material is prepared from the following raw materials in parts by weight: 95-99 parts of a synthetic ball prepared from dolomite dust and iron oxide powder and 1-5 parts of desilicated zirconia, wherein the percentage of the dolomite dust MgO+CaO is larger than or equal to 80%; the percentage of the iron oxide powder Fe2O3 is larger than 98%; the percentage of the desilicated zirconia ZrO2 is larger than 98.5%; the preparation method comprises the following concrete steps: (1) preparing a dolomite dust-iron oxide powder synthetic ball by using the dolomite dust and the iron oxide powder; (2) processing the dolomite dust-iron oxide powder synthetic ball into fine powder with different particle sizes and mixing in proportion; (3) uniformly mixing and stirring the dolomite dust-iron oxide powder synthetic ball mixed powder and desilicated zirconia micro-powder of which the size is 325 meshes, and packaging a finished product in a bag. The preparation method disclosed by the invention has the advantages of improving the stability of material volume and preventing the problems of cracking, peeling and blocking of a steel discharging opening at the furnace body. By adding a special modifying agent desilicated zirconia and adopting a dolomite dust and iron oxide powder compounding technology, crystal type transformation, generated during material cooling, of the raw materials, is inhibited; surface pulverization of the furnace bottom is solved when the furnace is shut down; the service life of the material is further obviously prolonged.

Description

technical field

[0001] The invention relates to a refractory material, in particular to a method for preparing a complex-phase combined magnesium-based amorphous refractory material for the bottom of an electric furnace. Background technique

[0002] With the improvement of users' requirements for steel quality, especially the improvement of comprehensive economic indicators such as steel / ton cost in recent years, and the continuous adoption of new technologies, the original magnesia-calcium-iron refractories for the bottom of the electric furnace can no longer be used well. To meet the needs of the current metallurgical process, problems such as cracking of the furnace bottom, spalling, and even blockage of the tapping hole occur from time to time, and the performance is more serious during oxygen blowing intensified smelting, which has become a bottleneck restricting electrometallurgical production. This phenomenon has been going on for several years without resolution. ...

Examples

Embodiment 1

[0024] The preparation method of composite-phase combined magnesium-based amorphous refractories for the bottom of an electric furnace, the raw materials are proportioned by weight, 95 parts of synthetic balls made of dolomite powder and iron oxide powder, plus 5 parts of desiliconized zirconium; the dolomite powder MgO+ CaO≥80%, iron oxide powder Fe 2 o 3 >98%, desiliconized zirconium ZrO 2 >98.5%; specific steps are as follows:

[0025] 1) Process and grind the dolomite powder and iron oxide powder into a fine powder with a particle size of 325 mesh, proportion by weight, 105 parts of dolomite powder, 2 parts of iron oxide powder, knead the above particle size materials, press balls, dry, and fire, Make dolomite powder-iron oxide powder synthetic ball;

[0026] 2) Process and grind dolomite powder-iron oxide powder synthetic balls into fine powders with a particle size of 6-3mm, 3-1mm, and 1-0㎜, and extract 1-0㎜ fine powder from dolomite powder-iron oxide powder synthetic...

Embodiment 2

[0029] The preparation method of composite-phase combined magnesium-based amorphous refractories for the bottom of an electric furnace, the raw materials are proportioned by weight, 97 parts of synthetic balls made of dolomite powder and iron oxide powder, plus 3 parts of desiliconized zirconium; the dolomite powder MgO+ CaO≥80%, iron oxide powder Fe 2 o 3 >98%, desiliconized zirconium ZrO 2 >98.5%; specific steps are as follows:

[0030] 1) Process and grind the dolomite powder and iron oxide powder into a fine powder with a particle size of 325 mesh, proportion by weight, 110 parts of dolomite powder, 3 parts of iron oxide powder, knead the above-mentioned particle size materials, press balls, dry, and fire, Make dolomite powder-iron oxide powder synthetic ball;

[0031] 2) Process and grind dolomite powder-iron oxide powder synthetic balls into fine powders with a particle size of 6-3mm, 3-1mm, and 1-0㎜, and extract 1-0㎜ fine powder from dolomite powder-iron oxide powder...

Embodiment 3

[0034] The preparation method of complex-phase combined magnesium-based amorphous refractories for the bottom of an electric furnace, the raw materials are proportioned by weight, 99 parts of synthetic balls made of dolomite powder and iron oxide powder, plus 1 part of desiliconized zirconium; the dolomite powder MgO+ CaO≥80%, iron oxide powder Fe 2 o 3 >98%, desiliconized zirconium ZrO 2 >98.5%; specific steps are as follows:

[0035] 1) Process and grind the dolomite powder and iron oxide powder into a fine powder with a particle size of 325 mesh, proportion by weight, 115 parts of dolomite powder, 4 parts of iron oxide powder, knead the above-mentioned particle size materials, press balls, dry, and fire, Made dolomite powder-iron oxide powder synthetic ball;

[0036] 2) Process and grind dolomite powder-iron oxide powder synthetic balls into fine powders with a particle size of 6-3mm, 3-1mm, and 1-0㎜, and extract 1-0㎜ fine powder from dolomite powder-iron oxide powder sy...

technical field

[0001] The invention relates to a refractory material, in particular to a method for preparing a complex-phase combined magnesium-based amorphous refractory material for the bottom of an electric furnace. Background technique

[0002] With the improvement of users' requirements for steel quality, especially the improvement of comprehensive economic indicators such as steel / ton cost in recent years, and the continuous adoption of new technologies, the original magnesia-calcium-iron refractories for the bottom of the electric furnace can no longer be used well. To meet the needs of the current metallurgical process, problems such as cracking of the furnace bottom, spalling, and even blockage of the tapping hole occur from time to time, and the performance is more serious during oxygen blowing intensified smelting, which has become a bottleneck restricting electrometallurgical production. This phenomenon has been going on for several years without resolution. ...

Examples

Embodiment 1

[0024] The preparation method of composite-phase combined magnesium-based amorphous refractories for the bottom of an electric furnace, the raw materials are proportioned by weight, 95 parts of synthetic balls made of dolomite powder and iron oxide powder, plus 5 parts of desiliconized zirconium; the dolomite powder MgO+ CaO≥80%, iron oxide powder Fe 2 o 3 >98%, desiliconized zirconium ZrO 2 >98.5%; specific steps are as follows:

[0025] 1) Process and grind the dolomite powder and iron oxide powder into a fine powder with a particle size of 325 mesh, proportion by weight, 105 parts of dolomite powder, 2 parts of iron oxide powder, knead the above particle size materials, press balls, dry, and fire, Make dolomite powder-iron oxide powder synthetic ball;

[0026] 2) Process and grind dolomite powder-iron oxide powder synthetic balls into fine powders with a particle size of 6-3mm, 3-1mm, and 1-0㎜, and extract 1-0㎜ fine powder from dolomite powder-iron oxide powder synthetic...

Embodiment 2

[0029] The preparation method of composite-phase combined magnesium-based amorphous refractories for the bottom of an electric furnace, the raw materials are proportioned by weight, 97 parts of synthetic balls made of dolomite powder and iron oxide powder, plus 3 parts of desiliconized zirconium; the dolomite powder MgO+ CaO≥80%, iron oxide powder Fe 2 o 3 >98%, desiliconized zirconium ZrO 2 >98.5%; specific steps are as follows:

[0030] 1) Process and grind the dolomite powder and iron oxide powder into a fine powder with a particle size of 325 mesh, proportion by weight, 110 parts of dolomite powder, 3 parts of iron oxide powder, knead the above-mentioned particle size materials, press balls, dry, and fire, Make dolomite powder-iron oxide powder synthetic ball;

[0031] 2) Process and grind dolomite powder-iron oxide powder synthetic balls into fine powders with a particle size of 6-3mm, 3-1mm, and 1-0㎜, and extract 1-0㎜ fine powder from dolomite powder-iron oxide powder...

Embodiment 3

[0034] The preparation method of complex-phase combined magnesium-based amorphous refractories for the bottom of an electric furnace, the raw materials are proportioned by weight, 99 parts of synthetic balls made of dolomite powder and iron oxide powder, plus 1 part of desiliconized zirconium; the dolomite powder MgO+ CaO≥80%, iron oxide powder Fe 2 o 3 >98%, desiliconized zirconium ZrO 2 >98.5%; specific steps are as follows:

[0035] 1) Process and grind the dolomite powder and iron oxide powder into a fine powder with a particle size of 325 mesh, proportion by weight, 115 parts of dolomite powder, 4 parts of iron oxide powder, knead the above-mentioned particle size materials, press balls, dry, and fire, Made dolomite powder-iron oxide powder synthetic ball;

[0036] 2) Process and grind dolomite powder-iron oxide powder synthetic balls into fine powders with a particle size of 6-3mm, 3-1mm, and 1-0㎜, and extract 1-0㎜ fine powder from dolomite powder-iron oxide powder sy...

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