Caustic soda in metallurgy: iron
Iron and caustic soda
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Sodium hydroxide is a strong alkali that has the ability to break down organic deposits. Iron is a heavy metal that is the main constituent of steel and cast iron products. Caustic soda and iron do not react with each other, and at the same time, caustic alkali in high concentration has a destructive effect on iron, therefore, iron containers cannot be used for the manufacture and storage of caustic. |
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Industrial applications
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In ferrous metallurgy, sodium hydroxide is used to remove sulfur from steel. This is an important physicochemical process that allows you to obtain pure iron without impurities. |
Because the increased sulfur content leads to the instability of the metal and the tendency to cracking. Iron is used to produce solid sodium hydroxide. |
This method is called ferritic and takes place in several stages: |

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As a result of the interaction of ferrous sulfate 3 and caustic soda, ferrous hydroxide and sodium sulfate are formed, which are widely used in the glass and oil refining industries.
There are many alloys, the main of which are cast iron and steel, which are widely used in the metallurgical industry, and one of the ways to obtain the purest product is the use of caustic soda. |
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