Bismuth (Bi) in the form of free metal and mineral nature. Minerals are bismuthinite, bismuth China. Bismuth into bismuth oxide minerals calcined, and then with carbon thermal reduction obtained, the available fire refining and electrolytic refining high-purity bismuth.
Bismuth (Bi) , the natural radioactive elements, silver-white lustrous metal, brittle and easily crushed; melting point 271.3 ° C, boiling point 1560 ° C, density 9.8 g / cm 3; poor thermal conductivity; from liquid to solid volume increases. Bismuth in the red hot air role; bismuth and sulfur, halogen compounds; not soluble in non-oxidizing acid, soluble in nitric acid, hot concentrated sulfuric acid. Low melting point alloy of bismuth can be prepared and used to automatically shut down or type alloy; carbonate oxygen bismuth and oxygen bismuth nitrate is used as drugs; bismuth oxide used for glass, ceramic industry.
Previously bismuth is considered to be the heaviest stable elements, but in 2003, found that bismuth weak radioactive α decay into thallium -205. The half-life of about 1.9 * 10 ^ 19 years to life in the universe is 10 billion times. Since then, lead elements of the quality for maximum stability.
CAS No. :7440 -69-9
Bismuth (Bi) is mainly used in the manufacture of fusible alloy, the melting point range is 47 ~ 262 ° C, the most common alloy of bismuth with lead, tin, antimony, indium and other metal, for fire-fighting devices, automatic sprinkler, boiler safety plug the event of fire, some of the pipes of the piston will “automatically” melt, spewing water. Fire and electrical industry, for the automatic fire extinguishing systems and electrical fuses, solder. Bismuth alloy solidification shrinkage characteristics for casting printing type and precision casting. Oxygen bismuth carbonate and nitric acid oxygen and bismuth for the treatment of skin damage and gastrointestinal problems.
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