Manganese, chemical element symbol is Mn; atomic number 25; located in the periodic table the fourth cycle f B family; atomic weight is 54.94; oxidation state +2, +3, +4, +6, +7.
In 1771, the Swedish chemist first discovered in the identification of pyrolusite manganese, in 1774 chemist the first time isolated in pyrolusite, in 1856 the UK for the first time use in steelmaking and prepared manganese steel, in 1851 be translated as "manganese" and introduced into China by Chinese chemist. Manganese is a higher abundances of element, the content in the Earth's crust is up to 0.1%, naturally form has soft manganese (MnO2), hard manganese [(BaH2O) 2MnO10], Manganese Carbonate (MnCO3), silicate, manganese (MnO • SiO2), manganese sulfide (MnS, MnS2), and other a variety of categories. In recent years, large amounts of manganese, manganese nodules found in the deep ocean seabed will become the main future manganese resources for human.
The major methods of manganese metal refining has thermal method (fire assay) and electrolysis (wet), the purity of the thermal production (metal manganese) is no more than 95% to 98%, pure manganese metal by Electrolytic preparation (EMM), its purity is 99.7 to 99.9%. Electrolytic production has become the main form of manganese metal production.
Use electrolytic process to produce manganese metal production – the appearance of manganese metal is like iron, irregular flaky, hard and brittle side shiny and other side rough, silver-white to brown, after processed into powder is silver gray; easily oxidized in the air, in the case of dilute acid can dissolved and the replace of hydrogen, slightly above room temperature, can degrade into water and release hydrogen.
The direct use of the manganese powder itself is rare, but its alloys and compounds are very important. Manganese and manganese alloy is one of the indispensable important raw materials for iron and steel industry, aluminum industry, magnetic materials industry, chemical industry. With the continuous development of science and technology and the continuous improvement of the level of productivity, Electrolytic manganese metal, due to its high purity, low impurity characteristics, is now successful and widely used in iron and steel smelting, non-ferrous metallurgy, electronics, chemical industry, environmental protection, food hygiene, welding industry and other fields, especially in recent years, the production of stainless steel use manganese to instead of nickel technology greatly increased, the demand for electrolytic manganese metal is increasing every year, at the same time, also stimulate the production has gradually increased, manganese and manganese alloy industry proportionally also developing with the industrial developing.
Electrolytic manganese metal production has the characteristics of complex process, many processes, process technology indicators is not easy to control, belonging to high pollution, high energy consumption, labor-intensive resource industries. Electrolytic manganese metal is extremely versatile used in iron and steel, alloy, chemical industry and so on. Products have including electrolytic manganese piece, electrolytic manganese ingot and electrolytic manganese powder, the manganese piece is white flaky solid silver, manganese is a silver-gray powder. Manganese content above 99.7%, particle size is according to customers’ requirements. The manganese powder in the metallurgical industry is one of the most important metal powders. Manganese in powder metallurgy production has large amount, its consumption accounts for about 40% of the total consumption of the metal powder.
Source:http://www.mhcmp.com
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