What is the background and overview of calcium carbide?
Calcium carbide is also known as "calcium carbide", commonly known as "calcium carbide", "stinky stone", "stinky coal stone". The molecular formula is CaC2. It is a primary combustible material when it comes into contact with water. Industrial products are gray, yellowish brown or black, and the crystal section with a higher content of calcium carbide is purple. The relative density is 2.22 (18℃). The melting point is 2300℃. It can absorb moisture in the air and conduct electricity. The higher the purity, the easier it is to conduct electricity. When it comes into contact with water or water vapor, it can produce flammable and explosive acetylene gas (commonly known as calcium carbide gas). This gas can catch fire when it encounters sparks and can also be ignited by the heat of the reaction. Acetylene gas and certain heavy metal salts can form a high-grade explosive mixture. This product often contains impurities such as phosphorus and sulfur, and it will also release toxic gases such as phosphine and hydrogen sulfide when it reacts with water. When the phosphine content exceeds 0.08% and the hydrogen sulfide content exceeds 0.15%, it is easy to cause spontaneous combustion and explosion. Its powder is irritating to the eyes and respiratory organs and can cause skin burns.
Calcium carbide is one of the basic raw materials for the organic synthesis industry. It can generate acetylene gas for welding and cutting metals, and is also a raw material for making polyvinyl chloride. It should be stored in a cool, ventilated and dry place. Water leakage is not allowed in this place. It should be handled with care during loading and unloading. The transportation vehicle must have rainproof and waterproof equipment and stay away from steel, copper alloys and salts. During transportation, it should be loaded last and unloaded first. It is strictly forbidden to load it on the deck and avoid sunlight exposure. It is forbidden to use water and foam during firefighting. Dry powder and dry sand can be used, and carbon dioxide is ineffective. After poisoning, people should be moved to fresh air immediately and given oxygen containing 5% carbon dioxide to help breathing. This product is made by co-heating quicklime such as anthracite or coke to high temperature in an electric furnace.
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