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Low density fire resistant pouring material for KR stirring paddle

A refractory castable, low-density technology, applied in the field of low-density refractory castables for KR stirring paddles, can solve the problems of low service life, high manufacturing cost, increased economical cost of molten iron desulfurization, etc., to reduce production costs and production costs. , Excellent thermal shock stability

Active Publication Date: 2009-01-07
SHANGHAI BAOMING REFRACTORIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to literature reports, at present, the refractory material for KR stirring paddle is mainly made of corundum-mullite castable, and its raw material is mainly composed of fused or sintered mullite, and then alumina micropowder, silica micropowder and high alumina cement are added. The service life is low, generally around 200 furnaces, and the manufacturing cost is relatively high, which increases the economic cost of molten iron desulfurization and desiliconization production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Coke gem 25-0mm: 450kg, silica: 1.5-0mm: 50kg, silicon carbide 3-0mm: 200kg as aggregate, 200 mesh silicon carbide fine powder 50kg, silica fine powder 20kg, alumina fine powder 75kg, alumina fine powder 80kg, 75kg of alumina cement, 3kg of sodium tripolyphosphate, and 2kg of aluminum powder. After mixing the above raw materials, add water to stir and cast them into shapes.

[0024] A batch of KR stirring paddles were prepared by using low-density refractory castables for the KR stirring paddles of the present invention. They were used on a 150-ton ladle in a steel factory. The molten iron treatment temperature was 1250-1350°C, and the treatment time was 7-15min / furnace. The average service life is 380 furnaces / piece, which is 160 furnaces / piece higher than the average service life of the original KR stirring paddle used in the same period of 220 furnaces / piece, and the castable cost is reduced by 10%-15%.

Embodiment 2

[0026] Coke gem 25-0mm: 500kg, silica: 1.5-0mm: 70kg, silicon carbide 3-0mm: 100kg as aggregate, 200 mesh silicon carbide fine powder 100kg, silica fine powder 40kg, alumina fine powder 80kg, alumina fine powder 60kg, 50kg of alumina cement, 2kg of sodium tripolyphosphate, 1kg of sodium hexametaphosphate, and 5kg of aluminum lactate. After mixing the above raw materials, add water to stir and cast them into shapes. Low density refractory castable.

[0027] A batch of KR stirring paddles were prepared by using low-density refractory castables for the KR stirring paddles of the present invention. They were used on a 180-ton ladle in a steel factory. The molten iron treatment temperature was 1250-1350°C, and the treatment time was 7-15min / furnace. The average service life is 350 furnaces / piece, which is 170 furnaces / piece higher than the average service life of the original KR stirring paddle used in the same period of 180 furnaces / piece, and the castable cost is reduced by 15%-2...

Embodiment 3

[0029] Coke gem 25-0mm: 550kg, silica: 1.5-0mm: 50kg, silicon carbide 3-0mm: 50kg as aggregate, 200 mesh silicon carbide fine powder 150kg, silica fine powder 30kg, alumina fine powder 30kg, alumina fine powder 40kg, 100kg of alumina cement, 2kg of sodium tripolyphosphate, 1kg of sodium hexametaphosphate, 1kg of aluminum powder, and 1kg of organic fiber. After mixing the above raw materials, add water, stir and cast them, and bake at medium temperature after curing to obtain the Low density refractory castable for KR stirring paddle.

[0030] A batch of KR stirring paddles were prepared by using low-density refractory castables for the KR stirring paddles of the present invention. They were used on a 120-ton ladle in a steel factory. The molten iron treatment temperature was 1250-1350°C, and the treatment time was 7-15min / furnace. The average service life is 320 furnaces / piece, which is 160 furnaces / piece higher than the average service life of the original KR stirring paddle ...

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PUM

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Abstract

The invention provides a KR stirring paddle desulfuration used low density fireproof casting material, which belongs to the field of a fireproof material used for pretreatment of ladle desulfuration and desilication before pneumatic steelmaking. The volume density of the fireproof casting material is 2.3 to 2.7g / cm<3>; the granule is primarily prepared with superfine flint clay, silica and carborundum. The casting material further comprises alumina powder, carborundum, silica micropowder and alundum cement of less than 0.074mm. The components and the mass percentages of the KR stirring paddle desulfuration used low density fireproof casting material are as follows: 60 to 80 percent of aggregate; 20 to 40 percent of fine powder; an additive of 0.03 to 0.35 percent of the total weight of the aggregate and the fine powder; a detonation inhibitor of 0.02 to 0.5 percent of the total weight of the aggregate and the fine powder; and stainless steel fiber of 0 to 7 percent of the total weight of the aggregate and the fine powder. After the raw materials are mixed, water is added, the mixture is beaten, cast and moulded. After the moulded mixture is cured, and molded mixture is baked at moderate temperature, thus getting the KR stirring paddle desulfuration used low-density fireproof casting material. The KR stirring paddle desulfuration used low density fireproof casting material has the advantages of low cost, high wear resistance at high temperature, high service life and so on.

Description

technical field [0001] The invention relates to a low-density refractory castable for a KR stirring paddle, belonging to the field of refractory materials for desulfurization and desiliconization pretreatment of molten iron by using a KR paddle in a ladle before steelmaking in a converter. Background technique [0002] So far, the pretreatment of molten iron before converter steelmaking mainly adopts desulfurization spray gun and KR stirring paddle for desulfurization and desiliconization. Spray gun desulfurization and desiliconization are mainly carried out in torpedo tanks. The principle is to use the carrier to spray the desulfurizer into the molten iron through the spray gun at high pressure for reactive desulfurization and desiliconization. The production cost is high, the desulfurization efficiency is low, and the service life is short. There are related documents It is reported that the highest desulfurization rate is 50-60%, and the service life is generally about 50...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 黄先德黄玉田
Owner SHANGHAI BAOMING REFRACTORIES CO LTD
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