Of very high purity electrolytic manganese, its role is to increase the hardness of the metal bonding material, the most widely used manganese-copper alloy, aluminum-manganese alloys, manganese alloys in which the alloy can improve the strength, toughness, wear resistance and Corrosive, electrolytic manganese is mainly supplied in the production of stainless steel.
There are two methods for producing manganese metal. One is electrolytic method, the obtained product is electrolytic manganese metal; the other is made of manganese-rich ore and high-silicon-manganese silicon alloy, and is produced by electric furnace desiliconization refining method, and the product is called manganese metal. The latter slightly manganese (Mn93% ~ 97%), containing a higher iron (Fe≈2.0%). Metal manganese is generally used as an alloying additive for smelting low-carbon high-quality steel or as an alloying agent for non-ferrous metal alloys. The product plan must be optimized based on the product requirements and through program comparison. The design scale is mainly determined based on ore resources, power supply and market demand. Most of the current stainless steel is electrolytic manganese.
Process: often use manganese carbonate ore with low manganese content (Mn 20%~23%) as raw material, crushed and ground mineral powder, added to the leaching tank which has returned anolyte, added sulfuric acid, steamed Heating near boiling, so that the manganese in the ore powder is leached into the solution, adding appropriate amount of buffer ammonium sulfate, adding manganese dioxide powder to the acid slurry to remove iron, then introducing liquid ammonia or adding lime milk to make the slurry neutral (pH ≈7), solid-liquid separation to remove the residue, adding vulcanizing agent (sodium dimethylamine, (CH3)2NCS2Na, SDD for short) or ethyl sulphide to the filtrate to purify nickel , cobalt and iron. The precipitate is precipitated, and the sulfide residue is removed by a second solid-liquid separation, and an additive (SeO2 or SO2:) is added to obtain a qualified electrolyte. During electrolysis, the qualified electrolyte is continuously added to the electrolysis cell, electrolyzed by electricity for a certain period of time (usually 24h), and the cathode plate with electrodeposited manganese is taken out (while putting a clean cathode plate to make electrolysis continuously), After passivation, washing and drying, the metal manganese is peeled off, which is the finished product. During electrolysis, the electrolyte passes through the diaphragm cloth and enters the anode chamber. The electrolyte flows out of the electrolyzer through a false bottom. This liquid is called the anolyte and is collected and returned to the leaching tank for leaching of manganese ore.
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