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Tapping hole filler and filling method

A taphole and raw material technology, applied in the field of taphole filler, can solve the problems of low self-opening rate and difficult sintering, and achieve the effects of high refractoriness, low cost, and improved lubricity and thermal conductivity

Inactive Publication Date: 2020-09-25
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Based on the above deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a tap hole filler and a filling method with a good treatment effect, which overcomes the poor fluidity of the existing tap hole filler, The limitations of low self-opening rate and difficult sintering meet the requirements of tapping process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The tap hole filler and its filling method are as follows:

[0022] Filling of the upper taphole: by mass percentage: 26% of quartz sand, 48% of sintered magnesia, 24.25% of waste magnesia bricks, 0.45% of recarburizer graphite powder, and 1.3% of sintering aid; The parts count includes: 0.2 part of boric acid, 0.1 part of bentonite, and 1 part of iron ore powder.

[0023] The particle size distribution of each raw material is calculated by mass percentage: quartz sand 1~3mm 70%, 0~0.5mm 2%, 0.5~1mm 28%; sintered magnesia 1~3mm 62%, 0.074~1mm 35%, 0~ 0.074mm 3%; forsterite sand 1~4mm 51%, 0.074~1mm 42%, 0~0.074mm 7%; magnesia silica sand 1~3mm 49%, 0~1mm 51%; waste magnesia brick 1~3mm 71%, 0~1mm 29%.

[0024] The particle size of sintering aid and recarburizer is less than 0.074mm;

[0025] Lower layer tap hole filler: dolomite sand.

[0026] The particle size distribution is calculated by mass percentage: 1~3mm 53%, 0.5~1mm 47%;

[0027] When filling, from the bo...

Embodiment 2

[0030] The tap hole filler and its filling method are as follows:

[0031] Filling for the upper taphole: by mass percentage: 8% of quartz sand, 37% of sintered magnesia, 23.35% of waste magnesia brick, 0.5% of recarburizer graphite powder, and 1.15% of sintering aid; The parts meter includes: 0.08 part of boric acid, 0.07 part of silicon micropowder, and 1 part of iron ore powder.

[0032] The particle size distribution of each raw material is calculated by mass percentage: quartz sand 1~3mm 60%, 0~0.5mm 5%, 0.5~1mm 35%; sintered magnesia 1~3mm 55%, 0.074~1mm 40%, 0~ 0.074mm 5%; forsterite sand 1-4mm 63%, 0.074-1mm 27%, 0-0.074mm 10%. Magnesia silica sand 1~3mm 68%, 0~1mm 32%. Waste magnesia brick 1-3mm 62%, 0-1mm 37%.

[0033] The particle size of sintering aid and recarburizer is less than 0.074mm;

[0034] Lower layer tap hole filler: dolomite sand.

[0035] The particle size distribution is calculated by mass percentage: 1~3mm 68%, 0.5~1mm 32%;

[0036] When filling...

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Abstract

The invention discloses a tapping hole filler and a filling method. The tapping hole filler is composed of an upper layer and a lower layer. The upper layer is prepared from the following raw materials: quartz sand, sintered magnesia, forsterite sand, dead burned high-silica magnesite, waste magnesia bricks and is prepared from the auxiliary materials: a recarburizer and a sintering aid; the lowerlayer is prepared from dolomite sand; during using, the upper layer raw materials are weighted according to the ratio and particle size gradation, first the main raw materials are mixed in a blendermixer for 15-30 minutes, then auxiliary materials are added to the blender mixer, mixing is carried out for 20-30 minutes, and then packing or construction use are carried out. The tapping hole fillerand the filling method overcome the limitations of an existing tapping hole filler such as poor fluidity, low self-opening rate and difficult sintering, and meet the requirements of the steel tappingprocess.

Description

technical field [0001] The invention relates to a tap hole filler, which belongs to the field of refractory materials for industrial kilns. Background technique [0002] Taphole filling is one of the key varieties of refractory materials used in molten steel smelting in metallurgical furnaces, and its self-opening rate is crucial to ensuring a normal smelting cycle. On the one hand, it must have suitable sintering performance in order to form a sintered layer, so that it can prevent high-temperature molten steel from leaking to the lower part of the tap hole and prevent fillers from floating up to cause accidents; on the other hand, the sintered layer formed by it is required to be moderately thick So that when the lower baffle plate of the tapping hole is opened, the filler will fall under the action of gravity, and the sintered layer will be broken and shell broken under the action of hydrostatic pressure of steel and thermal stress after sucking in cold air, forming self-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/46C04B35/66
CPCC04B35/66C04B2235/3206C04B2235/321C04B2235/3409C04B2235/3418C04B2235/3445C04B2235/349C04B2235/422C04B2235/425C21C5/4653
Inventor 周旺枝张洪雷刘黎刘孟邹龙徐国涛刘婳
Owner 武汉钢铁有限公司
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