Interesting facts about zinc
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Technical specifications
Zn is an element of the second group of the secondary subgroup, the IV period… Atomic weight is 30. Under normal conditions, it is a metal of a white-bluish color, (in the air dims, covered with a very thin layer of ZnO oxide). Specific gravity is 7.133 g / cm 3. The melting point is 419.6 ° C, the boiling point is 906.2 ° C.
History
Alloy copper and zinc — brass was known even in ancient Egypt, China and India. Over the years, it was not possible to separate pure zinc. In 1746, he developed a method for the preparation of this metal by calcination of a mixture of ZnO oxide with coal in refractory clay retorts without air, with the condensation of zinc vapor in special refrigerators. Supplier Avlob offers to buy non-ferrous metals at a bargain price. The price is the best in this segment of rental.
Geology
In nature, zinc in its native form is not found. This element is extracted from polymetallic ores such as sphalerite, zincite, willemite, smithsonite, calamine, franklinite, etc. The most common mineral among them is zinc blende or sphalerite, the main component of which is ZnS sulfide. Different impurities are able to give this mineral all kinds of colors. It is called a deceit because of the complexity of its definition. Zinc blende is considered to be the primary mineral, from which the others are formed: ZnO — zincite, ZnCO3 — smithsonite, 2ZnO • SiO2 • H2O — calamine.
Production
Polymetallic ores are enriched with selective flotation to obtain concentrates containing from 50 to 60% Zn plus copper, lead and other elements. Zinc concentrates in the fluidized bed are fired in ovens, converting the sulfide to zinc oxide. Sulfur dioxide, formed as a result of roasting, is used in the production of sulfuric acid. Of the ZnO oxide, the purified metal is obtained by two methods. 1) Pyrometallurgical (distillation) method — has been used for a long time. 2) Hydrometallurgical (electrolytic) method — was introduced relatively recently.
Delivery, price
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