Refractory castable for molten iron pretreatment spray gun

A pretreatment technology for refractory castables and molten iron, applied in the field of refractory castables, can solve problems such as shortened service life of spray guns, wear of spray guns, thermal stress spalling of spout melting loss, deterioration of structural spalling, and reduced use effect, so as to improve corrosion resistance Effect of properties and high temperature strength

Inactive Publication Date: 2010-09-01
WUHAN IRON & STEEL (GROUP) CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the aforementioned castables prolong the service life of the molten iron pretreatment spray gun to a certain extent, however, with the continuous improvement of the quality requirements of iron and steel products, the purity of molten iron injection pretreatment and the proportion of advanced pretreatment continue to increase. The pretreatment time of molten iron injection continues to prolong, and the spray gun wear, nozzle melting loss, thermal stress spalling and struc

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The refractory castable for molten iron pretreatment spray gun is made by mixing castable base material and appropriate amount of additives. Specifically, taking 100g of castable base material as an example, it consists of the following components: 16g of burnt gemstone, 33g of sintered zircon mullite, 25g of andalusite, 6g of dense corundum fine powder, α-Al 2 o 3 Micropowder 3g, ρ-Al 2 o 3 Micropowder 5g, silicon micropowder 7g, silicon carbide 2g, pure aluminum calcium carbonate 3g; The additive is based on the total weight of the castable base material, i.e. 100g, then it consists of the following components: heat-resistant steel fiber 2.5 g, polypropylene fiber 0.1g, sodium tripolyphosphate 0.15g, melamine 0.5g. The particle size of the burnt gems is 3-20 mm, wherein the weight of the burnt gems with a particle size of 8-20 mm is 5 g, the weight of burnt gems with a particle size of 5-8 mm is 5 g, and the weight of burnt gems with a particle size of 3-5 mm It i...

Embodiment 2

[0019] The refractory castable for molten iron pretreatment spray gun is made by mixing castable base material and appropriate amount of additives. Specifically, taking 100g of the castable base material as an example, it consists of the following components: 10g of burnt gemstone, 38g of sintered zircon mullite, 24g of andalusite, 6g of dense corundum fine powder, α-Al 2 o 3 Micropowder 5g, ρ-Al 2 o 3Micropowder 8g, silicon micropowder 4g, silicon carbide 3.5g, pure aluminum calcium carbonate 1.5g; The additive is based on the total weight of the castable base material, i.e. 100g, then it consists of the following components: heat-resistant steel Fiber 2.5g, metal aluminum powder 0.5g, sodium tripolyphosphate 0.10g, melamine 0.45g. The particle size of the burnt gemstones is 3-20mm, wherein the weight of the burnt gemstones with a particle size of 8-20mm is 3g, the weight of the burnt gemstones with a particle size of 5-8mm is 3g, and the weight of the burnt gemstones with...

Embodiment 3

[0022] The refractory castable for molten iron pretreatment spray gun is made by mixing castable base material and appropriate amount of additives. Specifically, taking 100g of the castable base material as an example, it consists of the following components: 14g of burnt gemstone, 30g of sintered zircon mullite, 30g of andalusite, 10g of dense corundum fine powder, α-Al 2 o 3 Micropowder 2g, ρ-Al 2 o 3 Micropowder 8g, silicon micropowder 3g, silicon carbide 1.5g, pure aluminum calcium carbonate 1.5g; The additive is based on the total weight of the castable base material, i.e. 100g, and then it consists of the following components: heat-resistant steel Fiber 2.5g, aluminum lactate 0.5g, sodium tripolyphosphate 0.10g, melamine 0.45g. The particle size of the burnt gemstones is 3-20 mm, wherein the weight of the burnt gemstones with a particle size of 8-20 mm is 4 g, the weight of burnt gemstones with a particle size of 5-8 mm is 5 g, and the weight of burnt gemstones with a...

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Abstract

The invention discloses refractory castable for a molten iron pretreatment spray gun, which is mixed by castable base stock and a proper amount of additive. The castable base stock is composed of 30-40% of sintering zirconium mullite, 10-20% of flint clay, 20-30% of andalusite, 5-10% of compact corundum fine powder, 2-5% of alpha-Al2O3 micro powder, 5-8% of rho-Al2O3 micro powder, 3-7% of silicon micro powder, 1-4% of carborundum powder and 1.5-3% of pure calcium aluminate cement by weight percent. The additive takes the total weight M of the castable base stock as a metering reference and is composed of 1-5% of heat resistant steel fiber, 0-0.1% of polypropylene fibre, 0-0.5% of aluminium lactate, 0-0.5% of metallic aluminium powder, 0-0.15% of sodium tripolyphosphate and 0-0.5% of melamine in weight percent. The castable has favorable thermal shock stability performance, high-temperature mechanical strength and corrosion resistance. The spray gun bushing manufactured by the refractory castable can effectively prolong the service life of the spray gun.

Description

technical field [0001] The invention relates to the field of refractory materials for molten iron injection pretreatment before converter steelmaking, in particular to a refractory castable for torpedo tanks and molten iron pretreatment spray guns in molten iron tanks. Background technique [0002] Hot metal injection pretreatment is an important process in the modern metallurgical process, widely used in domestic and foreign iron and steel enterprises. The injection desulfurization outside the molten iron furnace is to use the spray gun inserted into the molten iron container about 250mm away from the bottom of the tank, and spray the desulfurizer into the molten iron through high-pressure carrier gas to increase the reaction contact area; through the vigorous stirring and mixing of jet kinetic energy, the reaction mass transfer rate is increased ; and through the frequent insertion and injection of the spray gun into the molten iron container that is constantly being deliv...

Claims

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Application Information

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IPC IPC(8): C04B35/66C21C7/064
Inventor 欧阳德刚胡清明罗安智罗巍朱善合李明晖王海青张爱平
Owner WUHAN IRON & STEEL (GROUP) CORP
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