Cadmium plate

GOOLEE can provideCadmium, heavy non-ferrous metal element, chemical symbol CD, atomic number 481817. The simple substance is silver white metal, which is an excellent metal for absorbing neutrons. Making rods can slow down the chain fission reaction rate in nuclear reactors, and is very useful in zinc cadmium batteries. Its sulfide is bright in color and is used to make cadmium yellow pigment.

The ratio of material to cadmium in the earth's crust is 1000000:0.1 ~ 1000000:0.5. It is extracted from zinc ore or sulfur cadmium ore as a by-product. It is mostly used to protect other metals from corrosion and rust, such as electroplated steel, iron products, copper, brass and other alloys. Another use is to make a bright yellow pigment called cadmium yellow, which can be used as high-grade paint and painting pigment.

Cadmium is a silvery white and shiny metal with a melting point of 320.9℃, a boiling point of 765℃and a density of 8650 kg / m3. Toughness and ductility. Cadmium oxidizes slowly in humid air and loses metallic luster. When heated, a brown oxide layer is formed on the surface. If heated above the boiling point, cadmium oxide smoke will be generated. Under high temperature, cadmium reacts violently with halogen to form cadmium halide. It can also be combined with sulfur directly to form cadmium sulfide. Cadmium is soluble in acid but insoluble in alkali. The oxidation states of cadmium are + 1 and + 2. The solubility of cadmium oxide and cadmium hydroxide is very small. They are soluble in acid but insoluble in alkali. Cadmium can form a variety of coordination ions, such as CD (NH3), CD (CN), CdCl, etc.

Cadmium is highly toxic. The air and food polluted by cadmium do serious harm to human body, and the metabolism in human body is slow. Japan once had "pain disease" due to cadmium poisoning.

Metal cadmium can be obtained from dust or cadmium residue containing cadmium (such as coal or carbon reduction or sulfuric acid leaching and zinc powder replacement). Electrolytic refining and vacuum distillation can be used for further purification. Cadmium is mainly used for electroplating of steel, iron, copper, brass and other metals. It has strong anti-corrosion ability to alkaline substances. Cadmium can be used to make batteries with small volume and large capacitance. Cadmium compounds are also widely used in the production of pigments and phosphors. Cadmium sulfide, cadmium selenide and cadmium telluride are used in the manufacture of photocells.

Copper and Steel Clad Plate