Desulfurizing agent suitable for high-aluminum silicon steel and preparation method thereof

Abstract

The invention provides a desulfurizing agent suitable for high-aluminum silicon steel and a preparation method thereof. The desulfurizing agent comprises the following components: 75-80 percent of calcium oxide (CaO), 10-15 percent of aluminum oxide (Al2O3), 3-6 percent of magnesium oxide (MgO), 3-6 percent of magnesium chloride (MgCl2), not greater than 1.5 percent of silicon dioxide (SiO2), not greater than 0.02 percent of all titanium (Ti) and not greater than 0.02 percent of all carbon (C). The preparation method comprises the following steps: (1) weighing the raw materials: 72-77 percent of CaO, 8-13 percent of Al2O3 and 10-20 percent of binder; (2) respectively crushing the CaO and the Al2O3 into particles of which the particle sizes are less than 0.1mm; (3) heating the CaO to 120-150 DEG C, and carrying out spray treatment on the CaO particles by using silicone oil so as to form a protective film; (4) mixing the CaO and the Al2O3 with the binder; and (5) pressing into balls by using a ball press, and drying and packaging. The desulfurizing agent provided by the invention is easy to store, has high desulfurizing rate and low environmental pollution and has low corrosion on the refractory of a vacuum slot body; in the desulfurizing process, the molten steel carburetion and titanizing can be controlled to be under 5ppm; and the desulfurizing rate can reach at least 50 percent on the premise of not increasing the refining time.

Description

technical field [0001] The invention belongs to the technical field of steelmaking vacuum refining, and in particular relates to a RH vacuum treatment desulfurizer for high-aluminum silicon steel and a preparation method thereof. Background technique [0002] Silicon steel is a kind of steel for electrical engineering. Using silicon steel sheets with good performance to make iron cores of transformers and motors can not only save energy, reduce iron loss, but also reduce noise pollution. The core technology of its steelmaking process is the full removal of harmful elements and the reasonable control of its inclusions. Sulfur is a harmful element for most steel types, and desulfurization of molten steel during the RH refining process is a common method to control the sulfur content in steel. [0003] In the 1960s and 1970s, RH devices developed rapidly. Its main functions are degassing, alloying, chemical heating, removal of inclusions, desulfurization, etc. Among them, po...

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Problems solved by technology

[0007] As mentioned above, the existing desulfurizers cannot meet the desulfurization requirements of aluminum-containing silicon steel, and will cause carburization and titanium increase in molten steel during use. At the same time, the Al generated during the refining process of aluminum-containing silicon steel is not considered 2 o 3 and SiO 2 Influence on the properties of slag

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