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Refractory castable in use for homogeneous stopper plug of floating plug, and preparation method

A technology of refractory castables and slag stoppers, which is applied in the manufacture of converters, etc., can solve the problems of complex manufacturing process of slag stopper cones, large gaps in raw material density, and difficult utilization of ferrosilicon sieve blanks, so as to avoid processing and metal cores. The production, reduce the density difference, improve the effect of mixing uniformity

Inactive Publication Date: 2007-05-23
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese Patent Publication No. CN1453370A discloses a slag retaining cone for converter tapping, which is composed of a conical frustum with a large upper part and a smaller lower part and an inverted cone with a larger upper part and a smaller lower part. In order to ensure that the slag retaining cone The comprehensive specific gravity is between the molten steel and the molten slag. There is a cast iron core inside the slag retaining cone, and a refractory material layer outside; it can be seen that the slag retaining cone has the disadvantages of complicated manufacturing process and high cost.
However, if ferrosilicon aggregate is used to increase the comprehensive density of the slag stop bolt, due to the large density difference of raw materials, it is easy to cause the segregation of the mixture and the shift of the center of gravity of the slag stop bolt; Waste; in addition, the use of metal aggregate in the guide rod castable and the pouring segregation caused by the high density difference of the aggregate will increase the possibility of fusing during use, causing the slag stopper to drift and lose the slag stopper effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Preparation of 0.5 tons of refractory castable for slag stopper homogeneous plug head, wherein the components of the weight-increasing aggregate are: metal filings 59, the particle size of which is 0.15-5.0 mm, special-grade high-alumina clinker 16, its particle size is 0.15-1.0 mm, super high aluminum clinker 13, its particle size is 180 mesh, brown corundum 12, its particle size is 180 mesh, water glass 8, sodium fluorosilicate 0.5, melamine 0.1; components of refractory mixture Percentage by weight: super high alumina clinker 18, its particle size is 1.0-3.0mm; -Al 2 o 3 Micro powder 10.5, 625 bauxite cement 6.0, sodium hexametaphosphate 0.05, calcium lignosulfonate 0.1, melamine 0.1.

[0021] A method for preparing a refractory castable for a homogeneous plug head of a slag stopper, the steps of which are as follows:

[0022] 1) Preparation of weight-increasing aggregate:

[0023] a. The weight percentage and particle size are: metal scrap 59, the par...

Embodiment 2

[0028] Example 2: Preparation of 0.5 tons of castables, wherein the components of the weight-increasing aggregate are: metal shavings 72 with a particle size of 0.15-5.0 mm, super high-alumina clinker 9 with a particle size of 0.15-1.0 mm , super high alumina clinker 10.5, its particle size is 180 mesh, brown corundum 5, its particle size is 180 mesh, silica powder 1.5, α-Al 2 o 3 Micropowder 2, water glass 9, sodium fluorosilicate 0.6, melamine 0.1; the components of the refractory mixture are: super high alumina clinker 5, whose particle size is 1.0-3.0mm, super high alumina clinker 17, its The particle size is 0.15~1.0mm, brown corundum 15.5, the particle size is 180 mesh, silicon powder 1.5, α-Al 2 o 3 Micro powder 10.5, 925 bauxite cement 5.5, sodium hexametaphosphate 0.05, calcium lignosulfonate 0.1, melamine 0.1.

[0029] A method for preparing a refractory castable for a homogeneous plug head of a slag stopper, the steps of which are as follows:

[0030] 1) Preparati...

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Abstract

A refractory casting material for the uniform slag plug is prepared from the weighting aggregate (25-40 Wt%) and refractory mixture (60-75) through proportionally mixing metallic filings, super-grade high-Al clinker, brown corundum, silicon micropowder, alpha-Al2O3 powder, water glass, sodium fluorosilicate and melamine, mashing to become blocks, baking, pulverizing, sieving, and proportionally mixing it with refractory mixture.

Description

technical field [0001] The invention relates to a material for converter taphole equipment and a preparation method thereof, in particular to a refractory castable for producing slag stoppers for converter outlets and a preparation method thereof. Background technique [0002] At the end of BOF smelting, all the slag floats on the surface of molten steel. During the tapping process of the BOF, especially after most of the molten steel is discharged, the molten steel will form a strong eddy current at the tapping port, and the slag will inevitably follow the Molten steel flows out. Since slag contains a large amount of harmful components to molten steel, and these harmful components will return or dissolve into molten steel at any time, affecting the purity of molten steel and the quality of the final steel product. At the same time, a large amount of slag will also form different The form consumes the alloy, which reduces the alloy yield in the molten steel refining process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B14/34C04B22/08C04B24/24C21C5/46
Inventor 欧阳德刚胡清明罗安智张爱平
Owner 武钢集团有限公司
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