Ferromanganese,smelting,Used,d business, insurance Ferromanganese smelting
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Used as a deoxidizer and alloy additives insteelmaking, is the largest amount of ferroalloys. The manganese use for meltingferromanganese, general require ferromanganese content manganese from 30 to40%, manganese and iron ratio is greater than 7, and phosphorus and Mn ratio isless than 0.003. Smelting manganese carbonate before the first block to be made by sintering after roasting. High phosphorus and iron ore isgenerally only used proper proportions or through the selective reduction ofrefining low iron phosphorus manganese-rich slag.Carbon ferromanganese in internationalstandard is content 75 to 80% of manganese, to adapt to the low grade manganeseore raw materials, china provisions manganese lower grades (electric furnaceferromanganese more than 65% of manganese, blast furnace ferromanganesemanganese more than 50%). Carbon ferromanganese smelting blast furnace in thepast, with the development of the electric power industry, electric furnace wasgradually increased.According to metal powder supplier, blastfurnace smelting generally use less than 1000 m 3 blast furnace, equipment and production process isgenerally the same as the blast furnace. In the process of falling from theroof, the high prices of manganese oxide (MnO2, Mn2O3, Mn3O4) with increasingtemperature, gradually restored to MnO by CO, but MnO only direct reduction intoa metal by carbon at high temperatures, so smelting ferromanganese requires ahigher temperature of the furnace hearth, this refining ferromanganese blastfurnace using a high coke ratio (1600 kg / ton) and air temperature (1000 above). To reduce the manganese loss, the slag should be maintained highbasicity (CaO/SiO2 greater than 1.3). Due to the coke rate high and lowindirect reduction, yield refined ferromanganese blast furnace gas containing COthan the blast furnace, roof higher temperature (350 ).Oxygen enriched blast can increase the temperature of the hearth, lower cokerate, increase production, and due to the decrease in gas volume can reduce theroof temperature, a significant role in the improvement of ferromanganesesmelting.The reduction smelting of ferromanganese haveflux method (also known as low the manganese slag law) and no flux method (highmanganese slag) two kinds. Flux method principle is the same as blast-furnaceprocess, just electricity instead of heating coke in blast furnace. Through addlime to form a high basicity slag (CaO/SiO2 1.3 to 1.6) to reduce the loss ofmanganese. Flux method smelting lime to form alkalinity is lower (CaO/SiO2 lessthan 1.0), with high manganeses low iron low phosphorus manganese-rich slag.This method is less slag, reduce power consumption, and because of the lowerslag temperature can reduce manganese evaporationloss, and the byproductsmanganese-rich slag (25 to 40% manganese) can be used as raw material forsmelting manganese silicon alloy to achieve a higher manganese recovery (90%).Manganese silicon alloy use a closed orsemi-closed reduction smelting furnace. Generally use containing silica,phosphorus, manganese or another with addition of silica as raw materials.Manganese-rich slag containing high silica is a good raw material for smeltingmanganese silicon alloy containing phosphorus. Smelting consumption generallyabout 3500 to 5000 kW / ton. The furnace raw material first for pre-treatment,including whole, warm-up, pre-reduction and powder sintering, significantimproved the electric furnace operation and technical economic indicators.The high basicity slag can make themanganese reduced in the slag, reduce the manganese loss caused by the spoil.Charge preheating or loaded liquid manganese silicon alloy helps shorten therefining time and reduce power consumption. Medium and low carbonferromanganese also through liquid silicon manganese alloy, manganese ore and limemelt mixing each other to produce.Source:http://www.mhcmp.com
Ferromanganese,smelting,Used,d