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Magnesia-alumina-ferroalloy preparation method

A ferroalloy, magnesium-aluminum technology, applied in the direction of improving process efficiency, can solve the problem of low metal yield, achieve the effect of large melting point, low cost, and convenient use

Inactive Publication Date: 2010-08-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only is the metal yield low in smelting, but it also contains other elements except magnesium, aluminum, and iron

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Alloy composition (the following are all mass fractions): Magnesium: 3%; Aluminum: 35%; Iron: 62% Cloth order: put about a quarter of the aluminum in the furnace first, then add all the magnesium, and then add the rest aluminum, and finally add all the metallic iron or scrap.

[0013] Smelting method: first heat rapidly at 30-50°C / min, add to about 700°C, reduce the heating rate by 10-30°C / min and increase the heating rate to 900°C, and measure the temperature of the watch case with an infrared thermometer to measure approximately higher than that in the furnace The lowest temperature is about 50 degrees to 100 degrees, and it changes with the heating rate. After the surface temperature reaches 900 degrees, the heating rate is reduced again, and the heating rate is 1-10 °C / min. This stage is basically in the process of heat preservation, so that all the solid substances in the furnace are melted. Pouring is performed after all of them become liquid and intermelted.

Embodiment 2

[0015] Alloy composition: Magnesium: 5%; Aluminum: 35%; Iron: 60%

[0016] The fabric order and smelting method are the same as Example 1.

Embodiment 3

[0018] Alloy composition: Magnesium: 8%; Aluminum: 37%; Iron 55% The distribution sequence and smelting method are the same as Example 1.

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PUM

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Abstract

The invention relates to magnesium-aluminum-iron alloy and a preparation method thereof, which belongs to the field of steelmaking and is suitable for industrialized production of a desulfurating and deoxidizing agent of the magnesium-aluminum-iron alloy. The chemical compositions of the alloy in percentage by mass are: 3 to 15 percent of magnesium, 30 to 60 percent of aluminum and the balance being iron. An induction furnace is adopted for smelting, and the charging sequence is particularly important, wherein firstly, aluminum blocks which account for 25 to 35 percent of the total aluminum amount are added into the bottom of the induction furnace; secondly, all the magnesium ingots are placed into the induction furnace; thirdly, the residual aluminum blocks which account for 65 to 75 percent of the total aluminum amount are added into the induction furnace; and fourthly, all the metallic irons or waste steels are added into the induction furnace finally. The preparation method placesthe magnesium, the aluminum and the iron into the induction furnace for once, does not require smelting of intermediate alloy, shortens the process, directly produces the magnesium-aluminum-iron alloy, does not add any casting powder, realizes alloy smelting by reasonable charging and severe control of a temperature rise system, and is convenient to produce. The iron alloy is directly added into molten steel when used; and after the iron alloy is added, the content of oxygen and the content of sulfur in the molten steel are obviously reduced, and the prior chain deoxidizing products are converted into granulated deoxidizing products, so that the desulfurating and deoxidizing efficiency is higher and the cost is lower.

Description

technical field [0001] The invention belongs to the field of steelmaking, and relates to a preparation method of a magnesium-aluminum-iron alloy, which is suitable for industrial production of a magnesium-aluminum-iron alloy desulfurization and deoxidizer. Background technique [0002] With the rapid development of China's iron and steel industry in the past 20 to 30 years, the requirements for the purity, uniformity, and fine grain size of the steel used have become higher and higher. At the same time, it is required to reduce production costs, and the comprehensive performance of steel has also increased. . Pure aluminum acts as a stabilizer in the deoxidation process. Aluminum has a strong affinity for oxygen and high deoxidation efficiency, so it is widely used. However, whether pure aluminum or aluminum-iron alloy deoxidation is used, there are some disadvantages. From the physical point of view, aluminum has a low melting point, and its density is lower than that of m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C22C1/02
CPCY02P10/20
Inventor 张建良祁成林张雪松孔德文郭豪刘文文陈永星
Owner UNIV OF SCI & TECH BEIJING