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Preliminary melting type calcium aluminate for ultra-clean steel and method of manufacturing the same

A calcium aluminate, pre-melting technology, applied in the field of flux for steelmaking, can solve the problems of poor composition stability, inability to continuous production, high cost, and achieve the effects of low product cost, reduced pollution and good fluidity

Active Publication Date: 2008-08-20
上海彭浦冶金辅料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Calcium aluminate can be used as refining slagging agent. At present, it is basically produced by electric furnace and cupola furnace. The production of pre-melted calcium aluminate by electric furnace requires a large investment, and the carbon content in the product is greater than 0.5% by using electrodes to heat up. After melting and cooling, the slag is released, which cannot be continuously produced, and the cost is high
Cupola production uses coke as fuel, and the carbon content in the pre-melted calcium aluminate is greater than 0.5%, and the silicon dioxide is greater than 2.5%, regardless of the Al content in the electric furnace and cupola slag. 2 o 3 Both use bauxite, so TiO in pre-melted calcium aluminate 2 Both are greater than 1.5%, and the composition stability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Select calcium carbonate (calcite) containing 55% CaO, with a particle size of 0-5mm; containing Al 2 O 3 It is industrial alumina of more than 98%, with a particle size of 0-1mm; among which calcium carbonate (calcite) 101.8Kg, industrial alumina 43.12Kg, add 3% of water and mix with a mixer (model S114), each mixing weight is not more than 500Kg , using a 750 molding machine to press into a spherical shape of 30 × 30 × 40 mm. Feeding from both sides of the melting furnace, feeding once every 10 minutes, feeding on both sides at the same time, each feeding amount is 150Kg, the pressure of the melting furnace oil gun is 3-6Kg / cm 3 , fuel consumption 50-150Kg / h, furnace temperature 1580 ℃, continuous feeding, continuous discharging, the obtained calcium aluminate composition CaO is 55.94%, Al 2 O 3 43.5%, MgO 0.3%, Fe 2 O 3 0.4%, TiO 2 is 0.015%, C is 0.019%, S is 0.006%, and P is 0.0015%. The melting point of the product is less than 1350℃, and the bulk density i...

Embodiment 2

[0020] Select calcium carbonate (calcite) containing 55% CaO, with a particle size of 0-5mm; containing Al 2 O 3 It is 98% industrial alumina with a particle size of 0-1mm; wherein calcium carbonate (calcite) 90.9Kg, particle size 0-5mm, industrial alumina 50Kg, particle size 0-1mm, add water 3% and mix with a mixer (model 114) , the weight of each mixing does not exceed 500Kg, and it is pressed into a 30×30×40mm ball by a 750 molding machine. The feed is fed from both sides of the melting furnace at the same time, once every 10 minutes, the amount of each feeding is 150Kg, and the pressure of the oil gun of the melting furnace is 3-6Kg / m 3 , fuel consumption 50-150Kg / h, furnace temperature 1570 ℃, continuous feeding, continuous discharging, the obtained calcium aluminate composition CaO is 49.3%, Al 2 O 3 48.4%, MgO 0.87%, Fe 2 O 3 0.6%, TiO 2 is 0.013%, C is 0.016%, S is 0.015%, and P is 0.016%. Melting point 1335℃, bulk density greater than 2.92Kg / cm 3 .

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Abstract

The invention relates to a premelt calcium aluminate for super clean steels and the preparation method, the weight percentages of the chemical components in the calcium aluminate are as follows: CaO is 48 to 56%, Al2O3 is 40 to 50%, SiO2 is 0.5 to 3%, MgO is 0.5 to 1.5%, Fe2O3 is no more than 0.5%, TiO2 is no more than 0.02%, C is no more than 0.02%, S is no more than 0.02% and P is no more than 0.02%. The preparation method comprises the following steps: pressing calcium carbonate and alumina of certain amount into block, the weight percentage of the components: calcium carbonate 47 to 55.5% and alumina 36 to 50%; adding the calcium carbonate and the alumina in a melting furnace in batches for melting; obtaining the premelt calcium aluminate for super clean steels with the composition. The preparation method has the advantages of continuous feeding and slag tapping, simple process, stable components and low cost of products.

Description

technical field [0001] The invention relates to a pre-melted calcium aluminate for ultra-pure steel and a preparation method thereof. The pre-melted calcium aluminate for ultra-pure steel is a high-grade steel grade RH.LF and a tundish molten steel refining slag adjusting agent, suitable for Steelmaking flux for ultra-low titanium and ultra-low carbon steel grades. Background technique [0002] Calcium aluminate can be used as a refining slag adjusting agent. At present, electric furnaces and cupola furnaces are basically used for production. Electric furnaces are used to produce pre-melted calcium aluminates with large equipment investment, and the carbon content in the electrode heating products is greater than 0.5%, and the electric furnace is once After melting and cooling, the slag is produced, which cannot be continuously produced, and the cost is high. Cupola production uses coke as fuel, the carbon content in the pre-melted calcium aluminate is more than 0.5%, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/16C21C7/076
CPCY02P10/20
Inventor 吴秋华
Owner 上海彭浦冶金辅料有限公司
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