Density Of Cadmium Powder The Field Of Welding And Plating

Attributes  --------------------------------------------------------------------------------------------------------------------  Chemical Names: CADMIUM OXIDE  Molecular Formula: CdO  Molecular Weight: 128.4104 g/mol Application  --------------------------------------------------------------------------------------------------------------------About three quarters of cadmium is used in Ni-Cd batteries, is used mainly for pigments, coatings and plating, and as stabilizers for plastics, most of the remaining quarters. Cadmium was used in particular for electroplating steel where a film of cadmium only 0.05 mm thick provide complete protection against the sea. Cadmium has the ability to absorb neutrons, so that it is used as a barrier to control nuclear fission.Description  --------------------------------------------------------------------------------------------------------------------Cadmium is a silvery white, shiny ductile, very malleable metal. Its surface has a bluish tinge and the metal is soft enough to be cut with a knife, but it tarnishes in air. It is soluble in acids, but not in alkalis. It is similar in many respects, it tozincbut form more complex compounds.Cadmium is found mainly in the crust. Always occurs in combination with zinc. Cadmium also consists in the industries as an inevitable by-product of zinc, lead and copper extraction. After applying it enters the environment mainly through the ground, because it is in fertilizers and pesticides.Of course, a very large amount of cadmium in the environment are released, about 25,000 tons per year. About half of this cadmium is in rivers through weathering of rocks and some cadmium in the air, released by forest fires and volcanoes. The rest of the cadmium is released through human activities, such as manufacturing.No cadmium ore to metal is extracted, because more than enough for a byproduct of zinc smelting from its ore, sphelerite (ZnS), in which CdS is a significant impurity as much as 3% account . Therefore, the main mining areas are associated with zinc. World production is about 14 000 tonnes per year, the main producing country is Canada, to be the main supplier to the United States, Australia, Mexico, Japan and Peru.