The Research Of Electrolytic Manganese Metal
Electrolytic manganese metal is a kind of very important chemical raw material
, widely used in iron and steel, nonferrous metal, chemical industry, medicine, food and scientific research etc.. In 1956, China built the first production line. In 2004 Chinese electrolytic manganese production reached 494000 T, become the world's largest manganese powder production country, exporting and consuming country.
Clean production is through the constant improvement of the design, use advanced technology and equipment, use clean energy and raw materials, improve the management, utilization and other measures, to achieve " energy conservation, pollution reduction, efficiency" objective. Clean production is the route one must take to realize the strategy of environmental protection by "extreme " control to whole process control of the pollution, but also an important way of implement the scientific outlook on development, guide an enterprise to walk along new-style industrialized. Electrolytic manganese as a high pollution, high energy consumption industries, the implementation of cleaner production is particularly important.
Electrolytic manganese is the main raw material of manganese carbonate powder, concentrated sulfuric acid, manganese dioxide powder and liquid ammonia, auxiliary additive is selenium dioxide. Electrolytic tank anode liquid and 98% concentrated sulfuric acid in turn pass into the combining slot, with casts skip adding manganese carbonate powder, while the reaction towards the end, adding a manganese oxide ( composed of manganese dioxide reduction roasting preparation ), when the reaction towards the end of input ( manganese dioxide anode mud ) oxidation of low iron, adding liquid ammonia to adjust the pH value to 3.8 4.2 make the iron to Fe ( OH ) 3 in the form of precipitation, the above steps are in the combined tank. Electrolytic suitable temperature is 38 ~ 42 , need cooling process. Natural cooling in the static pool, electrolytic manganese precipitation is easily to be oxidized, first in the static pool to join selenium dioxide as antioxidants, the static adjustment process is generally 24h, obtain qualified electrolyte. Then the qualified liquid into the electrolytic cell, electrolytic bath cathode plate precipitation at 99.9% purity metal manganese sheet, through passivation, washing, drying, stripping to obtain the product.
Filter slag comprehensive utilization, including initial filter and fine filter press filter press, generally adopt the plate basket filter, according to metal powder supplier, every tons of manganese products produced filter residue about 5 6T, the initial filter residue accounted for more than 90%. If the electrolytic manganese production is 30000 t/a, then the filter residue generating capacity is about 15 180000 t/a. Filter residue stacking occupy a large amount of land, containing large amounts of Mn, Fe and a variety of heavy metal residue, and very fine particle size, easy access to water, soil environment, cause environmental pollution. Many manufacturers have residue problem, serious destruction of the local environment.
Initial filter residue comprehensive utilization had been research before, the main idea is to recover manganese mineral, then the tailing used to make brick or as road landfill, waste water recycling through processing. Use the difference of manganese minerals and others of the magnetic susceptibility to separate, by X ray diffraction and high magnification microscopy revealed, manganese mineral surface by acid leaching process of gypsum cover, must destroy the surface of the gypsum can be obtaining the good effect of magnetic separation. After many trials, found a grinding to head 120 occupies 90% above, and the strong magnetic roughing, finally strong magnetic scavenging effect is good, mineral manganese recovery rate can reach over 60%. Electrolytic manganese as a high material consumption, high energy consumption, high pollution industry, while the enterprise carry out cleaner production, through adopting clean raw auxiliary materials, advanced technology and equipment, waste recycling, water reuse and other measures, improve the electrolytic manganese industry, environmental and economic benefits, with important real significance.
Source:http://www.mhcmp.com
by:anelwew
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