Ferro Silicon Aluminium FeSiAl

What is Ferro Silicon Aluminium?

Ferro silicon aluminium is an deoxidizer in steelmaking. Ferro silicon aluminium improves the morphology of inclusions and reduces the content of gas elements in molten steel.

It is an effective new technology to improve steel quality, reduce costs and save aluminum. It is particularly suitable for deoxidation requirements of molten steel. Practice has proved that it not only meets the deoxidation requirements of steelmaking, but also has desulfurization performance and has the advantages of high specific gravity and strong penetration.

Ferro Silicon Aluminium FeAl35Si25
Ferrosiliconaluminium FeAlSi FeAl48Si18

Ferro Silicon Uses

As a deoxidizer and alloying element for steelmaking, the role of aluminum is very large. For many years, the method of aluminum cake or aluminum ingot directly added to the steel furnace or ladle steel is used in steelmaking.

The use of pure aluminum is not only high cost, and aluminum is oxidized by oxygen in the air and slag up to 70-90%, resulting in excessive burning of aluminum and large fluctuations in the amount of residual aluminum in the liquid steel.

A lot of work has been done to improve aluminum yield and accurate residual aluminum control. As a typical representative of this aspect, the wire feeding method has been widely used in the fine-tuning and supplementary deoxidation of aluminum residue in molten steel after the step of steelmaking. Its basic principle is to control the depth of aluminum added to molten steel and avoid the contact between aluminum and unstable components in air and slag.

The use of aluminum iron and other aluminum alloy, deoxygenation has also proved to be a very effective method, not only greatly reduce the amount of aluminum consumption, can more accurately control the amount of aluminum added, non-metallic inclusions content has also been reduced, silicon aluminum iron as a new compound deoxidizer in the past two years, in order to ensure the final oxygen content level and mechanical properties of the same steel with pure aluminum deoxygenation under the premise of Not only has the obvious aluminum saving effect (compared with the pure aluminum season aluminum 40-50%), but also improves the casting performance of part of the molten steel, and the phenomenon of water mouth nodulation is greatly reduced.

In order to make this technology applied as soon as possible, the Ministry of Metallurgy officially wrote in 1989, and proposed that “in 1990, all the key enterprises and local enterprises in the country began to promote the application of silicon aluminum iron as a deoxidizer”, replacing the original primary aluminum, and at the same time promulgated the provisional supply standards, and took a welcome step in the use of silicon aluminum iron for deoxidation and alloying of molten steel.

ferro silicon aluminium

Ferro Silicon Aluminium Production

Smelting equipment

For the production of silicon-aluminum-iron alloys, according to the raw material processing method, there are two types: ore reducing agent is directly put into the furnace after batching and first into the furnace after agglomeration treatment.

Most ferroalloy plants in my country do not have agglomeration processing equipment. Since the electric furnaces used to produce ferrosilicon and aluminum alloys were mostly designed based on the needs of ferrosilicon production, the voltage level is relatively high. When converting to produce ferrosilicon and aluminum alloys, due to the low resistivity of bauxite, it is difficult to insert the electrodes at the original operating voltage level, and the burning is not good, resulting in the furnace condition being difficult to control. In addition, the capacity of the ore-fired furnaces used to produce ferrosilicon and aluminum alloys in my country is generally small. When producing alloys with high aluminum content, the slag and iron are difficult to separate and need to be processed outside the furnace. The small-capacity ore-fired furnace has a small output of iron, making it difficult to effectively implement this process.

Based on the rational use of resources and the production equipment and process conditions in my country, alloys with low aluminum content should be produced, while as users, the aluminum content of the alloy should generally be as high as possible, which constitutes a contradiction.

ent, the slag and iron are difficult to separate and need to be processed outside the furnace. The small-capacity ore-fired furnace has a small output of iron, making it difficult to effectively implement this process.
Based on the rational use of resources and the production equipment and process conditions in my country, alloys with low aluminum content should be produced, while as users, the aluminum content of the alloy should generally be as high as possible, which constitutes a contradiction.

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