Advantages Of Using Silicon Calcium

The main components of silicon-calcium alloy are silicon (Si) and calcium (Ca), and usually contain different amounts of impurities such as iron (Fe), aluminum (Al), carbon (C), sulfur (S) and phosphorus (P). According to the different calcium and silicon contents, silicon-calcium alloy can be divided into different grades.

The production process of silicon-calcium alloy mainly includes electric furnace smelting method. This method uses quartz (SiO2) as a silicon source, lime (CaO) as a calcium source, and adds a reducing agent (such as coke, anthracite or charcoal) for reduction reaction. The specific steps are as follows: First, according to the target composition ratio of silicon-calcium alloy, the amount of each raw material is accurately calculated, and the quartz, lime and reducing agent are mixed evenly in proportion. The mixed raw materials are loaded into the electric furnace layer by layer, and the current is introduced into the furnace using electrodes to form arc heating, so that the temperature in the furnace reaches about 1500~1800℃. Then, at high temperature, quartz and carbon undergo a reduction reaction to generate gaseous SiO, which is further reduced to metallic silicon; at the same time, the calcium in the lime forms a silicon-calcium alloy with silicon. When the reaction in the furnace is completed, the silicon-calcium alloy forms a liquid deposit at the bottom of the furnace. The liquid silicon-calcium alloy and the slag are separated through the furnace mouth, and the alloy is poured into the mold for cooling and forming.

Silicon calcium alloy has a wide range of applications in the field of metallurgy. Silicon calcium alloy has a strong deoxidation ability, and the deoxidation product is easy to float and discharge, which can improve the performance of steel and improve the plasticity, impact toughness and fluidity of steel. Therefore, it is widely used as a deoxidizer for steel grades such as rail steel, low carbon steel, stainless steel, and special alloys such as nickel-based alloys and titanium-based alloys. Since calcium has a strong affinity with sulfur, silicon calcium alloy is also often used as a desulfurizer, which can significantly reduce the sulfur content in steel. Silicon calcium alloy is also suitable for use as a warming agent in converter steelmaking workshops. Silicon releases a large amount of heat after reacting with oxygen, which has a certain effect on increasing the temperature of molten steel. In the cast iron industry, silicon calcium alloy can be used as an inoculant, which helps to form fine-grained or spherical graphite, make the graphite in gray cast iron evenly distributed, reduce the tendency of white cast iron, and improve the quality of cast iron.

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