Manganese is a chemist found in the soft manganese ore in 1774. At that time, this kind of soft manganese ore is known as " Manganese ", so used the name as the element name that " manganese ". Its chemical symbol is Mn, its atomic number is 25, a kind of transition metal.
According to metal powder supplier, the most important use of manganese is made of alloy -- Manganese steel. If add 2.5-3.5% manganese in steel, the low manganese steel is brittle like glass, easy to broken. However, if add more than 13% of the manganese, made of high manganese steel, then become rigid and resilient. If high manganese steel is heated to a pale orange will become very soft, easy to conduct various kinds of processing. In addition, it is not magnetic, will not be attracted by the magnet. Now, people use a lot of manganese steel to manufacture steel mill, ball bearings, bulldozer and excavator bucket and is frequently affected by grinding component, and the rails, bridges etc. The new cultural hall roof in Shanghai of China, use a novel structure, with thousands of manganese steel pipe welded into the root. In 76 meters vertical, horizontal 138 meter fan hall, there are not a pillar. Because of using manganese steel as a structural material is very strong, and the material is saved, the average price per square metre roof only 45 kilograms of manganese steel. In 1973 the construction of Shanghai Stadium ( seats eighteen thousand), also used manganese steel as the structure material of space truss roof. In the military, high manganese steel manufacturing steel helmet, tanks, steel armor penetrator warhead. While refining manganese are mixed together manganese containing up to 60 -70% soft tin and iron ore to create.
Manganese steel is an important manganese alloy, manganese steel contains 30% manganese, has good mechanical strength. Composed by 84% steel, 12% manganese and 4% nickel. Manganese nickel copper alloy, its resistance with the temperature change is very small, used in the manufacture precision electrical equipment.
Another important compound of manganese is potassium permanganate ( commonly known as " potassium permanganate ." ). The potassium permanganate is purple crystal acicular. Just add a little bit of potassium permanganate, is sufficient to make a vat of water turn into purple. The potassium permanganate is a strong oxidant, can used as sterilization. In public places often put a bucket of purple disinfection of water, known as the " gray manganese water ", in fact, this is the potassium permanganate solution, the concentration is 1/1000. However, the water can not drink up, because it had the emetic effect, used in medicine as washing agent and emetic. In analytical chemistry, potassium permanganate used as oxidizing agent, the famous potassium permanganate method is to use it as a titrating solution for chemical analysis. Reduced potassium permanganate is manganese dioxide. " Ash manganese water " used up, often have some black residue under, that is the manganese dioxide.
In addition, manganese carbonate is an important white pigment, commonly known as " manganese white ", while the manganese sulfate in agriculture is used as a seed germination agent or " Mn " -- trace element fertilizer.
Manganese powder with high purity, its role is to increase the hardness of metal materials, the most widely used has Mn-Cu alloy, manganese alloy, manganese in these alloys can improve the strength, toughness, wear resistance and corrosion resistance, electrolytic manganese supply mainly in stainless steel production. Manganese metal production in two ways. One is using electrolysis method, the product is the electrolytic manganese metal; another is use rich manganese and high silicon MnSi alloy as raw material, electric silicon refining production, product called manganese metal. The latter contains manganese slightly lower ( Mn93% ^ 97% ), a high iron content ( Fe H 2% ). Manganese metal commonly used for smelting low carbon quality steel alloy additives, or used as non-ferrous metal alloy agent.
Source:http://www.mhcmp.com
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