Preparation method of silicon carbide press balls

Abstract

The invention discloses a preparation method of silicon carbide press balls used in steel-making deoxygenation, which is implemented by smashing bulk silicon carbide into granules with diameter being within 3mm to be as ingredient and sieving; mixing starch weighing 2-3% of silicon carbide ingredient and water weighing 5-7% of silicon carbide ingredient in a container and agitating to made starch slurry to be as adhesive; taking fluorite powder weighing 5-10% of silicon carbide ingredient to be as auxiliary material; adding sieved silicon carbide granules, auxiliary material fluorite powder and adhesive starch slurry into a drum-type agitator for agitating for 15-20 minutes; taking uniformly agitated silicon carbide doped with starch slurry and fluorite powder out of the agitator and directly putting into a ball press for wet pressing; and drying the formed press balls until moisture is within 0.5%. The silicon carbide press balls in the invention has equal size and uniform chemical ingredient content, thus enhancing molten steel quality and easiness of steel-making time control, lowering melting point of silicon carbide, reducing dust and improving operating conditions of workers.

Description

technical field [0001] The invention relates to a method for preparing silicon carbide pressure balls, in particular to a method for preparing silicon carbide pressure balls for steelmaking. Background technique [0002] Usually, the addition of silicon carbide in steelmaking is to crush silicon carbide into particles of a certain size, and then add it directly. This process has the following defects: because the speed of the chemical reaction is related to the size of the particle surface, and the size of the above-mentioned crushed silicon carbide particles is not uniform, resulting in an unbalanced chemical reaction speed in the steelmaking process, and the steelmaking process cannot be well controlled. Time and rhythm, therefore, it is difficult to control the melting point and time of steelmaking according to the reaction time; silicon carbide has a higher melting point, and the melting reaction occurs on the solid-liquid surface in molten steel, the contact area is sma...

AI Technical Summary

Problems solved by technology

This process has the following defects: since the speed of the chemical reaction is related to the size of the particle surface, the size of the above-mentioned crushed silicon carbide particles is not uniform, resulting in an unbalanced chemical reaction speed in the steelmaking process, and the steelmaking process cannot be well controlled. Time and rhythm, therefore, it is difficult to control the melting point and time of steelmaking according to the reaction time; silicon carbide has a higher melting point, and the melting reaction in molten steel occurs on the solid-liquid surface, the contact area is small, and the reaction speed is slow, resulting in carbonization The use effect of silicon is low and the yield rate is low; silicon carbide is directly added after crushing, which is easy to generate dust, which pollutes the environment greatly and affects the health of workers; in addition, the content of silicon carbide in silicon carbide products varies, and the content of silicon carbide with low content is low. Silicon products are easy to reduce the quality of steelmaking, and as a manufacturer, it is difficult to separate the silicon carbide content levels, so it is difficult to control the amount of silicon carbide products added in steelmaking