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This metal is not just in the marble. Look around you: the lime of the wall, the chalk of the wall, the concrete at the foot, the white plaster, ... all live with calcium. Of course, this calcium is in the form of a compound.
Calcium,Soluble in acid, liquid ammonia, slightly soluble in alcohol, insoluble in benzene. The higher its purity, the slower the surface darkens in the air. In case of intense heat in the air, the combustion generates calcium oxide and calcium nitride. Hydrogenated calcium is slowly formed at 400 ° C and above. Reaction with water at room temperature to ease, generating a protective film of calcium hydroxide, heated with water to react violently release hydrogen. Chemical properties are very lively, has a strong reduction ability, easy and halogen, sulfur, nitrogen and other compounds. When heated to restore almost all of the metal oxide. Flammable.
The main use of metallic calcium (calcium-containing master alloy) in the steel industry is processed into metallic calcium particles, and then made into calcium or pure calcium wire, which is finally used for the refining of steel outside the furnace, the role of desulfurization, deoxygenation, Increase the liquidity of molten steel and promote the rapid floating of inclusions in molten steel, generally used for the production of high quality steel; used as a dehydrating agent to make anhydrous alcohol ; in the petroleum industry, as a desulfurizer, in the metallurgical industry , Use it to oxygen or sulfur.
Do not dissolve in benzene, kerosene, slightly soluble in ethanol, soluble in acid, liquid ammonia.
11 to 12 (1% solution)
Saturated vapor pressure (kPa)
1.33 (983 ° C)
Critical pressure (MPa)
First, the leak emergency response Isolate leaking pollution area and restrict access. Cut off the fire. Recommended emergency personnel to wear self-contained breathing apparatus, wear fire protective clothing. Do not touch the spill directly. A small amount of leakage: rinse with plenty of water, diluted with water into the waste water system. Large leaks: water wetting, and then collected for recycling or shipped to the disposal of waste disposal sites. Second, protective measures Respiratory protection: Wear a hood-type, electrically-powered, filtered respirator when possible exposure to dust. 1 Eye protection: Respiratory protection has been protected. 2 body protection: wear plastic protective clothing. 3 hand protection: wear rubber gloves. 4 other: the work site is strictly prohibited smoking. Third, first aid measures 1 Skin contact: Immediately remove contaminated clothing, rinse with plenty of water for at least 15 minutes. Get medical attention. 2 Eye contact: Lift the eyelid immediately, rinse thoroughly with plenty of running water or saline for at least 15 minutes. Get medical attention. 3 Inhalation: Remove quickly from the scene to fresh air. Keep the airway clear. If breathing is difficult, give oxygen. If breathing stopped, resuscitate immediately. Get medical attention. 5 Ingestion: Gargle with water, to drink milk or egg white. Get medical attention. 6 fire fighting methods: No water, halogenated hydrocarbon agent rescue, it is not appropriate to use carbon dioxide fire extinguishing. In the fire, such as improper use of fire extinguishing agents, but also violent reactions can occur, causing an explosion, we must pay special attention to fire safety and rescue. Extinguishing agents: dry graphite, soda ash, sodium chloride powder.
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