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| Wugang Daye Mine Pellet Production Trends |
| = Keeping on over 1,300 tons / day rate = |
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Since the start up of production on January 29, iron pellet production and quality at Wugang Daye Mine located in Huangshi city, Hubei province, China have both achieved targeted marks consecutively, thereby trending a "two highs" operation: high rate production and high quality product. Daily production of pellets in the first phase shaft furnace has been keeping on a rate of over 1,300 tons with clearing compression strength of over 1,800 N/piece reaching 62% and every technical norm of production being completely satisfied, Wugang Group announced February 9. Impacted by the reduced supply of electric power and raw materials at the outset of start up, operation of pellet production line faced some constraint. But aiming to ensure continuous operation of the production line, the Mine realized operation of "long-standing and full utilization", by taking outstanding measures of control conceived for a continuous operation: carrying out inspection and quality control for 35 key equipment components, such as water-beams in the shaft furnace, raw material feeding discs, butterfly valves in the coal gas pressurizing equipment. The Mine put into practice debugging work during operation following the production start up, and ensured to maintain a "Switch on and Ready to Start" condition. With respect to the roasting temperature of the shaft furnace tending to be instable which also came out following the start up of production, the Mine carried out roasting tests prior to feeding raw materials into the furnace, and determined an optimum roasting temperature for the furnace, which the Mine uniformly brought home to each working section in charge. This led to stabilize furnace conditions and enhance the rate of standing pellet strength test. In parallel, the Mine took up a "Three-way Controlling" method for establishing optimum furnace conditions of coal gas generator: staged and standardized control of furnace operation, quantitative control and control for reducing carbon content in the ash pit, thereby achieving targeted norms, having coal gas generating heat be reduced to within the specified range, and effectively raising the roasting effect of the shaft furnace. Besides, the Mine achieved green pellet dropping test to stand the passing mark of four times or more; having the rate of green pellets of between 10 and 16 mm reach 89% or more; and ensured green pellet quality totally satisfies requirements expected from production in the shaft furnace, by putting into practice the following measures: - strict control of green pellets, - strict control of blending raw materials, - adoption of an "observing discs" operational method, - scientific blending of bentonite, and - reasonable control of water content in raw materials. |
| last modified : Fri 19 Feb, 2010 [10:07] |
