Zinc
انجمن علمی زبان انگلیسی مدرسه راهنمایی تیزهوشان شهید بهشتی بروجرد

 

Discovery of Zinc

Zinc ores have been used to make brass (a mixture of copper and zinc) and other alloys since ancient times.

A zinc alloy comprising 87.5% zinc was discovered in an ancient site in Transylvania.

Zinc smelting began in the 12th century in India by reducing calamine (zinc carbonate, ZnCO3) with wool and other organic materials.

The element name is reported to come from the old German word ‘zinke’ meaning pointed; a reference to the sharp pointed crystals formed after smelting.

Credit for isolating the metal is usually given to Andreas Marggraf in 1746, in Berlin. He heated a mixture of calamine ore and carbon in a closed vessel without copper to produce the metal.



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تاريخ : پنج شنبه 16 آذر 1391برچسب:,
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