Molten steel electrochemical desulphurization method and apparatus

Abstract

The invention provides a molten steel electrochemical desulphurization method and an apparatus thereof. The method comprises the following steps: filling molten steel into a furnace body, adding a slag material with thickness of 30-150mm; inserting anode and contacting with slag; applying an electrical field with direct current voltage of 0.1-20V and electric current of 0.1-50A through anode and cathode by an additional direct current power supply. The apparatus is composed of a furnace body with bottom-blowing permeable brick, anode, an external direct current power supply and cathode. The anode and the cathode are connected with direct current power supply through leads, the anode is fixed on a crane of the anode and is contacted with slag, the cathode is arranged at the bottom part of the furnace body and contacted with molten steel. The desulphurization is performed on molten steel without a desulfurizer, generation of deoxidation impurities and generation of resulphurization. The molten steel electrochemical desulphurization method and the apparatus of the invention have the advantages of simple equipment, convenient operation, high desulphurization efficiency and low cost, especially are adapted to popularization and application on refining equipments of 30-350 tons steel ladle.

Description

technical field [0001] The invention belongs to the technical field of steelmaking and refining, and in particular relates to a method and device suitable for desulfurization by an external electric field between molten steel and slag. Background technique [0002] Sulfur is one of the harmful elements in steel. Its main hazards are: hot embrittlement of steel and anisotropy of steel after rolling. Therefore, the sulfur content in steel must be strictly limited. Especially for high value-added steel such as electrical silicon steel, the requirements for sulfur content are more stringent. Therefore, the removal of sulfur in molten steel is one of the main objectives of the refining process. The traditional desulfurization refining process is carried out through the slag-gold reaction. The slag has a certain absorption capacity for sulfur. After the contact and reaction of the slag-gold, the sulfur in the metal partly enters the slag phase to achieve the purpose of removal. ...

AI Technical Summary

Problems solved by technology

At the same time, since the raw materials used in the refining process generally contain sulfur, the molten steel will return to sulfur during the smelting process.

In addition, these desulfurization methods rely on the addition of a large amount of desulfurizers for desulfurization, which increases the cost of smelting accordingly, and can no longer meet the national requirements for low-carbon, environmental protection, and sustainable development of iron and steel production enterprises.

With the development of science and technology, the requirements for the variety and quality of metal products are getting higher and higher, and the traditional smelting process alone cannot meet the requirements for the purification of molten steel

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