Premelting type desulfurizing agent suitable for high-aluminum silicon steel and preparation method thereof

Abstract

The invention provides a premelting type desulfurizing agent suitable for high-aluminum silicon steel and a preparation method thereof. The desulfurizing agent comprises the following components by weight percent: 80-85 percent of calcium oxide (CaO), 13-18 percent of aluminum oxide (Al2O3), not greater than 1.5 percent of magnesium oxide (MgO), 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 87-90 percent of limestone of which the granularity is not greater than 10mm and 10-13 percent of Al2O3 of which the granularity is not greater than 10mm by weight percent; (2) putting the raw materials in a mixer and evenly mixing; (3) adding a mixture to a smelting furnace, then, blowing fuel oil for heating, and smelting; and (4) discharging, cooling and crushing for later use. The desulfurizing agent provided by the invention is easy to store, has high desulfurizing rate and has low erosion on the refractory of a vacuum slot body; and in the desulfurizing process, molten steel carburetion and titanizing can be controlled to be under 5 parts per million (ppm), and the desulfurizing rate can reach at least 60 percent on the premise of not increasing the refining time.

Description

technical field

[0001] The invention belongs to the technical field of steel-making vacuum refining, and in particular relates to a RH vacuum-treated pre-melting desulfurizer for high-alumina 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. Amon...

Examples

Embodiment Construction

[0013] The present invention will be further described below by way of examples.

[0014] The embodiment of the present invention carries out material selection, preparation and smelting according to the following methods:

[0015] (1) The raw material is high-quality limestone with a particle size of ≤10mm (including CaCO 3 more than 98%) and high-quality Al 2 o 3 (including Al 2 o 3 more than 98%).

[0016] (2) Add the raw materials into the mixer for mechanical mixing according to the following percentage by weight: limestone: 87% to 90%, Al 2 o 3 : 10% to 13%, the mixing time is 2 to 4 hours, ensure full mixing.

[0017] (3) Put the mixture into the smelting furnace and inject fuel oil for heating and smelting. The fuel oil used is low-sulfur heavy oil with a calorific value greater than 41840 kJ and a weight percentage of sulfur content less than 1.5%. The temperature of the furnace is raised to 1500-1600 ℃.

[0018] (4) Take it out of the oven, cool it down, and...

technical field

[0001] The invention belongs to the technical field of steel-making vacuum refining, and in particular relates to a RH vacuum-treated pre-melting desulfurizer for high-alumina 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. Amon...

Examples

Embodiment Construction

[0013] The present invention will be further described below by way of examples.

[0014] The embodiment of the present invention carries out material selection, preparation and smelting according to the following methods:

[0015] (1) The raw material is high-quality limestone with a particle size of ≤10mm (including CaCO 3 more than 98%) and high-quality Al 2 o 3 (including Al 2 o 3 more than 98%).

[0016] (2) Add the raw materials into the mixer for mechanical mixing according to the following percentage by weight: limestone: 87% to 90%, Al 2 o 3 : 10% to 13%, the mixing time is 2 to 4 hours, ensure full mixing.

[0017] (3) Put the mixture into the smelting furnace and inject fuel oil for heating and smelting. The fuel oil used is low-sulfur heavy oil with a calorific value greater than 41840 kJ and a weight percentage of sulfur content less than 1.5%. The temperature of the furnace is raised to 1500-1600 ℃.

[0018] (4) Take it out of the oven, cool it down, and...

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