The Production Methods And Environmental Of Manganese
Metal manganese for ferroalloy use is a manganese single quality-based
, and a variety of other ingredients are as pure manganese metal impurities to be strictly limited. Manganese metal is mainly used in the production of high-temperature alloys, stainless steel, non-ferrous metal alloys and high strength low carbon steel additives deoxidizer and desulfurizer. Most of them are used for producing aluminum-manganese alloy, stainless steel and stainless steel electrode. Al-Mn alloys have good corrosion resistance and high strength, mainly used in the aviation industry and modern architecture with decorative materials. According to metal powder supplier, the manganese production methods have the thermite method, the silicon thermal power and electrolysis.
Aluminum thermal method is using aluminum as the reducing agent, use manganese redox chemicals released heat to a method for smelting and refining manganese than 90% of the low grade manganese metal. Charge of thermite smelting manganese metal is manganese oxide, aluminum particles and heating agent (usually with saltpeter, or potassium chlorate). The thermite method is very strict requirements for raw materials, the production process can not remove the impurities, which is characterized by a large amount of aluminum consumed, high production costs, has few manufacturers to adopt this method of producing manganese metal. Occupational hazards that may exist: manganese smoke and dust of manganese, aluminum smoke, alumina dust, high temperature, thermal radiation, noise, etc.
The silicon thermal power production of manganese metal was more widely applied. The principle is similar with the silicon thermal power production of low-carbon ferromanganese. It is refining furnace with high the silicomanganese silicon alloy of silicon manganese oxide reduction in manganese-rich slag to produce. The main advantage of this method is that the production cost is relatively low. Occupational hazards that may exist: manganese dust, smoke of manganese, silica dust, high temperature, thermal radiation, noise, etc.
Now the most widely used method of manganese metal production is electrolysis, the method using the DC electrolytic manganese sulfate solution, get high manganese, metal manganese ore types and grades can be used, and can even use some poor manganese ore, but the cost is higher. The required raw materials of the electrolytic production are mainly including manganese powder, sulfuric acid, ammonium sulfate, an oxidizing agent, a reducing agent, additives, etc.. Occupational hazards that may exist: manganese ore dust, manganese dust, sulfuric acid mist, ammonia, noise the electrolyzer generated electromagnetic radiation.
Manganese powder production, environmental protection and solve the dust generated in the production process of governance, and a small amount of noise and wastewater treatment. Manganese dust flammable or explosive dust control, and human long-term excessive inhalation can cause manganism to manganese dust must take effective measures to be kept in strict governance. Dust removal measures generally set where dust the hood dust extraction via cyclone dust collector, electrostatic precipitators or water film precipitator dust collection or governance. Dust and explosion proof should be considered, the dedusting equipment shall consider explosion-proof. Noise control, electrolytic manganese powder production equipment will produce some noise, but generally within the control standards, do not need to do special handling to prevent resonance devices, resonance, soft connection between the general equipment. Wastewater treatment, the EMM powder production process consumes a small amount of water, are a nitrogen production process the cooling water, dust with water and formulated anti-manganese oxide powder the passivation solution washed with water, washed with water of these aspects is the small amount and can be recycled for use without efflux.
Source:http://www.mhcmp.com
by: anelwew
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