Chemical name : Calcium silicide
Molecular formula: CaSi2
Appearance and properties: white powder or glassy solid
Solubility: insoluble in water, soluble in acids and alkalis.
Stability: unstable at room temperature and pressure
Decomposition products: silicon oxide, calcium oxide.
Storage conditions:
Store in a cool, dry, and well ventilated warehouse. Keep away from sparks and heat sources. Prevent direct sunlight. The packaging must be sealed and protected from moisture. It should be stored separately from acids, fluorine, etc., and avoid mixing storage. Equip corresponding types and quantities of firefighting equipment. The storage area should be equipped with suitable materials to contain leaks.
Hazard characteristics:
Strong reaction with water, releasing hydrogen gas that is prone to explosion and ignition. When encountering acid, it emits
hydrogen silicon gas that is prone to spontaneous combustion. React violently with fluorine. Powder and air can form explosive mixtures.
purpose:
Used for deoxidation in steelmaking and special steel additives
Production method
1. High purity calcium silicide can be obtained by direct melting of elemental silicon and calcium. But the operation must be carried out in two steps. Step 1: Mix pure calcium shavings and pure silicon powder evenly and place them in a hard ceramic boat. Quickly place the boat into a quartz reaction tube, introduce CO2 into the tube, and the boat has been heated to 1000 ℃. In just a few seconds, the mixture melts and the reaction proceeds fiercely. Take out the porcelain boat, immediately coagulate the product CaSi, and crush the Chemicalbook. CaSi is a porous block like substance, appearing in lead gray with a metallic luster. Step 2: Mix CaSi with the calculated amount of Si powder evenly, place it in a nickel boat, and heat it at 1000 ℃ in an H2 airflow. Because the final stage of the reaction proceeds slowly, it needs to be heated for 15 hours.
2. By mixing pure CaO and silicon with appropriate fluxes CaF2 and CaCl2, CaSi2 can be obtained by melting at 1400 ℃. The resulting CaSi2 is mixed with a large amount of silicon element.
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