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A kind of non-burning al 2 o 3 ‑cr 7 c 3 Brick and its preparation method

A technology of al2o3-cr7c3 and molten iron ladle, which is applied in the field of non-fired Al2O3-Cr7C3 bricks for ladle walls and its preparation, can solve the problem of increasing the production cost of alumina-silicon carbide-carbon bricks and damaging alumina-silicon carbide - The service life of carbon bricks, reducing the density of alumina-silicon carbide-carbon bricks, etc., to achieve the effect of improving slag erosion resistance and thermal shock stability, preventing erosion and penetration, and good thermal shock stability

Active Publication Date: 2017-05-03
锦州集信高温材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But inevitably, both SiC and graphite in alumina-silicon carbide-carbon bricks are prone to oxidation to form CO 2 Gas escapes, leaving pores in the brick body, which greatly reduces the density of alumina-silicon carbide-carbon bricks, thereby reducing the ability of bricks to resist slag-hot metal erosion, and damages the alumina-silicon carbide-carbon Brick life
In addition, there are many varieties of raw materials, antioxidants, additives, and binders for preparing alumina-silicon carbide-carbon bricks, which increase the production cost of alumina-silicon carbide-carbon bricks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of hot metal ladle wall without burning Al 2 o 3 -Cr 7 C 3 Bricks and methods of making them. The non-burning Al 2 o 3 -Cr 7 C 3 The raw materials and content of bricks are 55~57wt% ferrochrome slag particles as aggregate, 7~8wt% ferrochrome slag fine powder, 1~2wt% ρ-Al 2 o 3 Fine powder and 35~37wt% Cr 7 C 3 Fine powder is the base material.

[0036] According to the raw materials and their content, first mix the base material for 3-5 minutes, add the mixed base material into the aggregate, and mix for 5-8 minutes; then add thermosetting phenolic resin and 2~4wt% silica sol, mixed for 10~15 minutes, machine-pressed, then cured at 30~35°C for 10~12 hours, and kept at 200~220°C for 12~24 hours to obtain ladles Unburned Al for wall use 2 o 3 -Cr 7 C 3 brick.

[0037] The molten iron cladding wall prepared by this embodiment uses unburned Al 2 o 3 -Cr 7 C 3 Brick, measured: bulk density is 3.15~3.17g / cm 3 , 1550 ℃ static crucible method slag r...

Embodiment 2

[0039] A kind of hot metal ladle wall without burning Al 2 o 3 -Cr 7 C 3 Bricks and methods of making them. The non-burning Al 2 o 3 -Cr 7 C 3 The raw materials and content of bricks are 56~58wt% ferrochrome slag particles as aggregate, 7~8wt% ferrochrome slag fine powder, 1~2wt% ρ-Al 2 o 3 Fine powder and 34~36wt% Cr 7 C 3 Fine powder is the base material.

[0040] According to the raw materials and their content, first mix the base material for 3-5 minutes, add the mixed base material into the aggregate, and mix for 5-8 minutes; then add thermosetting phenolic resin and 2~4wt% silica sol, mixed for 10~15 minutes, machine-pressed, then cured at 30~35°C for 10~12 hours, and kept at 200~220°C for 12~24 hours to obtain ladles Unburned Al for wall use 2 o 3 -Cr 7 C 3 brick.

[0041] The molten iron cladding wall prepared by this embodiment uses unburned Al 2 o 3 -Cr 7 C 3 Brick, after measurement: bulk density is 3.16~3.18g / cm 3 , 1550 ℃ static crucible meth...

Embodiment 3

[0043] A kind of hot metal ladle wall without burning Al 2 o 3 -Cr 7 C 3 Bricks and methods of making them. The non-burning Al 2 o 3 -Cr 7 C 3 The raw materials and content of bricks are 57~59wt% ferrochrome slag particles as aggregate, 6~7wt% ferrochrome slag fine powder, 2~3wt% ρ-Al 2 o 3 Fine powder and 33~35wt% Cr 7 C 3 Fine powder is the base material.

[0044] According to the raw materials and their contents, first mix the base material for 3 to 5 minutes, add the mixed base material into the aggregate, and mix for 5 to 8 minutes; then add thermosetting phenolic resin and 1~3wt% silica sol, mixed for 10~15 minutes, machine-pressed, then cured at 30~35°C for 10~12 hours, kept at 200~220°C for 12~24 hours to make molten iron ladle Unburned Al for wall use 2 o 3 -Cr 7 C 3 brick.

[0045] The molten iron cladding wall prepared by this embodiment uses unburned Al 2 o 3 -Cr 7 C 3 Brick, after measurement: bulk density is 3.17~3.19g / cm 3 , 1550 ℃ static c...

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PUM

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Abstract

The invention discloses an unfired Al2O3-Cr7C3 brick for a hot metal ladle wall and a preparation method thereof. The unfired Al2O3-Cr7C3 brick comprises aggregate and substrate materials, wherein the aggregate is prepared from, by weight, 55%-60% of ferrochrome slag particles, and the substrate materials are prepared from, by weight, 6%-8% of ferrochrome slag fine powder, 1%-3% of rho-Al2O3 fine powder and 32%-37% of Cr7C3 fine powder. The preparation method comprises the steps that according to the raw materials and the contents thereof, the substrate materials are mixed firstly, and the mixed substrate materials are added to the aggregate to be mixed for 5-8 min; thermosetting phenolic resin accounting for 4%-6% by weight of the raw materials and silica sol accounting for 1%-4% by weight of the raw materials are additionally added, mixing is conducted for 10-15 min, and mechanical pressing is conducted; maintenance is conducted for 10-12 h on the condition that the temperature ranges from 30 DEG C to 35 DEG C, heat preservation is conducted for 12-24 h on the condition that the temperature ranges from 200 DEG C to 220 DEG C, and the unfired Al2O3-Cr7C3 brick for the hot metal ladle wall is prepared. The unfired Al2O3-Cr7C3 brick for the hot metal ladle wall and the preparation method thereof have the advantages of being low in production cost and simple in technology, and the prepared unfired Al2O3-Cr7C3 brick for the hot metal ladle wall is high in density, strong in slag erosion resistance and good in heat-shock stability.

Description

technical field [0001] The invention belongs to the technical field of unfired bricks used for ladle walls of molten iron. Be specifically related to a kind of molten iron ladle wall and use non-burning Al 2 o 3 -Cr 7 C 3 Bricks and methods of making them. Background technique [0002] Ladle is an open equipment for transporting and smelting molten iron. When the molten iron is shipped, the molten iron ladle wall is subject to high temperature, thermal shock and slag-hot metal chemical erosion; when the molten iron is poured out, the temperature of the molten iron ladle wall decreases rapidly. Generally speaking, the service conditions of refractory materials for ladle walls are harsh. With the development of iron and steel smelting level (such as "three removal" process), the service life of refractory materials for ladle walls is further reduced. Therefore, "low cost, high performance" has become the development direction of refractory materials for ladle walls. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C04B35/66
Inventor 张寒高红军赵惠忠宋建义曹锟曹杨曹志明寇志远
Owner 锦州集信高温材料有限公司