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Tap-hole filling material and filling method thereof

A technology of tapping hole and main raw material, applied in the field of tapping hole filler and its filling, can solve problems such as poor fluidity, low self-opening rate, influence of molten steel smelting, etc., achieve corrosion resistance of molten steel, improve lubricity and thermal conductivity , low cost effect

Active Publication Date: 2016-12-21
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

However, the taphole fillers currently on the market have problems such as poor fluidity and low self-opening rate, which have an impact on molten steel smelting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The tap hole filler and its filling method are as follows:

[0025] The first layer of taphole filler: in terms of mass percentage, it includes: 40% of quartz sand, 35% of sintered magnesia, 25% of waste magnesia-chrome bricks, 0% of carburizer, and 0% of sintering aid;

[0026] The particle size distribution of each raw material is calculated by mass percentage: quartz sand 1~3mm 65%, 0~0.5mm 2%, 0.5~1mm 33%; sintered magnesia 1~3mm 70%, 0.074~1mm 26%, 0~ 0.074mm 4%; waste magnesia-chrome brick 1-3mm 60%, 0-1mm 40%;

[0027] The second layer of taphole filler: in terms of mass percentage, it includes: 38% of quartz sand, 37% of sintered magnesia, 23.35% of waste magnesia-chrome bricks, 0.5% of recarburizer graphite powder, and 1.15% of sintering aid; The agent includes by mass parts: 0.08 parts of boric acid, 0.07 parts of silicon micropowder, and 1 part of iron ore powder.

[0028] The particle size distribution of each raw material is calculated by mass percentage:...

Embodiment 2

[0034] The tap hole filler and its filling method are as follows:

[0035] The first layer of tap hole filler: in terms of mass percentage, it includes: 44% of quartz sand, 45% of sintered magnesia, 11% of waste magnesia-chrome bricks, 0.2% of recarburizer, and 0.8% of sintering aid; In terms of parts by mass, it includes: 0.03 parts of boric acid, 0.03 parts of silicon micropowder, and 0.74 parts of iron ore powder.

[0036] 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 58%, 0.074~1mm 29%, 0~ 0.074mm 13%; waste magnesia-chrome brick 1-3mm 72%, 0-1mm 28%; the particle size of sintering aid and recarburizer is less than 0.074mm;

[0037] The second layer of tap hole filler: in terms of mass percentage, it includes: 28% of quartz sand, 58% of sintered magnesia, 10.8% of waste magnesia-chrome brick, 0.9% of recarburizer graphite powder, and 2.3% of sintering aid; The ...

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Abstract

The invention discloses a tap-hole filling material, main raw materials of which are quartz sand, sintered magnesia clinker and waste and old magnesia-chromite bricks and auxiliary materials of which are a carburant and a sintering aid. The raw materials contain, by weight, 25-45% of quartz sand, 30-60% of sintered magnesia clinker, 10-35% of waste and old magnesia-chromite bricks, 0-2% of the carburant and 0-11% of the sintering aid. A filling method of the tap-hole filling material comprises the following step: more than one tap-hole filling material with different ratios undergoes layered filling according to contents of the carburant and the sintering aid from low gradient to high gradient, and the contents of the carburant and the sintering aid at the bottom layer are the lowest. Through compounding of the main raw materials and the auxiliary materials and layered gradient filling, fluidity, sintering property and pouring rate of the filling materials are raised, limitations such as poor fluidity, low free-opening rate and the like of existing tap-hole filling materials are overcome, and technological requirements of converter tapping are met. In addition, cost is low.

Description

technical field [0001] The invention relates to a tap hole filler and a filling method thereof, belonging to the field of refractory materials for industrial kilns. Background technique [0002] Electric furnace tapping hole filler is one of the key varieties of refractory materials for electric furnace, and its self-opening rate is very important to ensure the 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/047
Inventor 周旺枝徐国涛刘黎张洪雷刘孟
Owner 武汉钢铁有限公司
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