Premelted slag for unpolluted deoxidization with externally applied voltage between metal and slag and preparation method thereof

Abstract

The invention provides premelted slag for unpolluted deoxidization with externally applied voltage between metal and slag and a preparation method thereof. The premelted slag comprises 30-40% of CaO, 30-40% of Al2O3, 10-12% of MgO, less than 3% of SiO2, 1-15% of FeO, 1-10% of Fe2O3 and less than 1% of inevitable impurities. The method comprises the following steps of: (1) proportioning materials: weighing and proportioning the following raw materials according to slag components: small lime particles, aluminum powder, ferric oxide scales and MgO powder; (2) mixing materials: crushing the materials, and mixing the materials for 30 min in a material mixer; (3) heating to melt: loading the mixed materials into a heating furnace, heating to 1200-1550 DEG C, maintaining the temperature for 15-30 min, air-cooling the slag in hot state to room temperature to obtain melted blocks; and (4) crushing: crushing the melted blocks into premelted slag blocks with 2-40 mm particle size. The premelted slag provided by the invention has the advantages of simple production method, convenience for use and operation, low cost, no pollution and high utilization rate and yield and is especially suitable for application and dissemination on 30-350 ton steel ladle refining facilities.

Description

technical field [0001] The invention belongs to the technical field of steelmaking and refining technology, and in particular relates to a pre-melted slag suitable for pollution-free deoxidation treatment with an external electric field between slag and gold and a preparation method thereof. Background technique [0002] The cleanliness of steel seriously affects the performance and quality of steel, and there are many factors that determine the cleanliness of steel, and the deoxidation operation in the smelting process is the key link. In order to remove the oxygen in the steel, the traditional deoxidation method is mainly based on the direct deoxidation of the deoxidizer. create pollution. As people's requirements for the cleanliness of steel are getting higher and higher, the traditional deoxidation method can no longer meet people's requirements. Reducing or even avoiding the pollution of deoxidation products to molten steel is an important way to reduce the total oxyg...

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Problems solved by technology

Although the slag introduced in its invention has the characteristics of low melting point, fast melting speed, good fluidity, and high oxygen ion conductivity, its slag has strict requirements on the content of FeO, and it is difficult to control during experiment and production. Poor; at the same time, the synthetic slag is in the form of powder, which is seriously lost in the smelting process and will cause dust pollution; in addition, the synthetic slag powder has a large surface tension, and it takes a long melting time to contact with molten steel, so the utilization rate is low. Difficult to promote and apply

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