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Method for preparing molten steel purifying agent

A purification agent and liquid steel technology, applied in the direction of reducing gas emissions, can solve the problems of high production cost of aluminum-calcium alloy, limit promotion and use, increase alloy price, etc., to facilitate application and promotion, reduce production cost, and improve quality Effect

Inactive Publication Date: 2020-05-15
谢应凯
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One ton of alloy liquid needs to be cast in a small mold of 80-90 pieces, and the casting time is 40-50 minutes, which affects the alloy output
[0005] 2. Blocking is difficult
[0007] Due to the above reasons, the production cost of aluminum-calcium alloy is high, the output is low, the price of the alloy is increased, and the promotion and use in large-scale production are limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Aluminum calcium alloy blocks. Ingredients ratio of raw materials: 80 kg of metal aluminum, 20 kg of calcium. Put it into the melting furnace according to its proportion and melt it into alloy liquid. Cast the alloy liquid into a bar mold, and cast an alloy bar with a length of 3m, a width of 20mm, and a thickness (height) of 20mm. After cooling, cut into cubes with a length, width and height of 20 mm. The fire consumption of the alloy is 1.2%, and the furnace time is about 10 minutes. Alloy composition: Al 79.4%, Ca 18.1%, and the balance is impurities. A manual cutting of more than 10 tons.

Embodiment 2

[0019] Aluminum calcium magnesium alloy block. Ratio of ingredients: 82 kg of aluminum, 10 kg of calcium, and 8 kg of magnesium. Put it into the electric furnace according to its proportion and melt it into alloy liquid. The alloy liquid is cast into a mold for casting an alloy ingot to form an alloy ingot. Then the alloy ingot is extruded into a 2m, 30mm wide, and 20mm high alloy bar, and the alloy bar is cut into a 40mm cuboid alloy block. It takes about 5 minutes for the alloy liquid to come out of the furnace and cast the mold. The alloy composition: Al81.4%, Ca9.3%, Mg7.6%, and the balance is impurities. According to the flammability of calcium and magnesium, when melting and casting alloys containing calcium and magnesium in the furnace, the equipment should be modified to prevent the burning of calcium and magnesium. Calcium and magnesium burnout < 2% is produced with this.

Embodiment 3

[0021] Aluminum calcium magnesium alloy block. Ingredients ratio: aluminum 80%, reduced calcium 15%, magnesium 5%. Calcium and magnesium blocks are added to the vacuum bag for the production of electrolytic aluminum, and the particle size is less than 10mm 3 , Use the temperature of purifying molten aluminum at 950-970°C to melt calcium and magnesium at 840°C to make aluminum-calcium-magnesium alloy liquid. Then put the liquid into the electrolytic cell, and use the wire puller to produce alloy bars with a diameter of 20mm and a length of 6m, and then cut into 20mm alloy blocks. The alloy is 79% aluminum, 14.7% calcium, 4.9% magnesium, and the balance is unavoidable impurities. More than 11 tons of mechanical cutting and manual cutting. Fire consumption is less than 1%.

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Abstract

The invention provides a method for preparing a molten steel purifying agent. The method aims to solve the problems that an aluminum-calcium-magnesium alloy molten steel purifying agent produced by hot melt casting has the defects of high production cost, low yield, irregular shape and the like, and is limited to popularization and application in large-scale production. The method is characterizedby comprising the steps of firstly melting an aluminum-based alkaline earth metal alloy liquid by adopting a remelting method or an impact melting method, then preparing the aluminum-based alkaline earth metal alloy liquid into alloy strips, and finally cutting the alloy strips into alloy blocks. The method has the positive effects that the tapping time is short, cutting forming is easy, the fireconsumption is low, the production cost of the alloy is obviously reduced, and the method is convenient to apply and popularize in large-scale steelmaking production.

Description

technical field [0001] The invention belongs to a molten steel purifying agent for steelmaking. The molten steel purifying agent refers to a molten steel purifying agent with the functions of aluminum deoxidation and calcium modification treatment. Specifically, the molten steel purifying agent is prepared by hot smelting and cold forming. Background technique [0002] Steelmaking deoxidation uses aluminum deoxidation. Aluminum ingots are made into aluminum wires, aluminum blocks, aluminum segments, aluminum iron, etc. When aluminum is deoxidized, AI with a high melting point (2100°C) will be generated in molten steel 2 o 3 , forming solid inclusions. To change the AI 2 o 3 Properties, purification of molten steel, and then use calcium (cored wire) to treat AI in molten steel 2 o 3 Carry out modification treatment (generally called calcium modification), so that the AI ​​in molten steel 2 o 3 Calcium aluminate with a low melting point (1400°C) is generated, which fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D3/00C22C1/02C22C21/00C21C7/06C21C7/00
CPCB22D3/00C21C7/00C21C7/06C22C1/026C22C21/00Y02P10/134
Inventor 谢应凯
Owner 谢应凯
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