【摘要】：目前重介設備的分選下限已小于0.25mm,從技術經(jīng)濟角度來衡量,+0.25mm粒級煤已沒有必要進入浮選作業(yè)重復分選。因此,在我國采用重介質旋流器工藝的煉焦煤選煤廠,多數(shù)可將浮選入料粒度上限下調為0.25mm。 在采用無壓給料三產(chǎn)品重介質旋流器工藝的煉焦煤選煤廠中,處理精煤磁選機尾礦的精煤泥弧形篩,實質起到了煤泥浮選生產(chǎn)系統(tǒng)的粒度控制功能。本文通過對浮選入料粒度及其控制設備的分析,進行了氣動式擊打弧形篩在不同擊打間隔時間和擊打壓力時的參數(shù)優(yōu)化試驗研究,以不同的角度出發(fā),得到了針對于林西選煤廠和大多數(shù)選煤廠兩種情況下的氣動式擊打弧形篩的最佳擊打間隔時間和最佳擊打壓力,并與淮南潘一選煤廠的兩段精煤泥弧形篩進行了對比分析。 試驗研究表明：針對于林西選煤廠,考慮到其最終精煤灰分要求,精煤泥弧形篩的指定粒度為0.125mm,最佳擊打間隔時間和最佳擊打壓力分別是l0s和0.1MPa,比原來的篩分效率提高了21.32%。而對于大多數(shù)選煤廠,在指定粒度為0.25mm時,氣動式擊打弧形篩的最佳擊打間隔時間和最佳擊打壓力分別是4s和0.3MPa,其工藝效果要好于傳統(tǒng)的不擊打弧形篩以及兩段弧形篩。氣動式擊打弧形篩有效地控制了浮選入料的粒度上限,為其能在浮選中得到有效分選提供了有利條件。
[Abstract]:At present, the lower limit of separation of heavy medium equipment is less than 0.25 mm. Judging from the point of view of technology and economy, it is no longer necessary for 0.25mm granular coal to enter the flotation operation for repeated separation. Therefore, most coking coal preparation plants using heavy medium cyclone process can lower the upper limit of flotation feed size to 0.25 mm. In the coking coal preparation plant which adopts the three-product heavy medium cyclone process without pressure feed, the fine coal slime arc sieve used to treat the tailings of the concentrate coal magnetic separator plays the function of particle size control of the coal slime flotation production system. Based on the analysis of the particle size of floatation feed and its control equipment, this paper studies the optimization of the parameters of the pneumatic impact arc screen under different beating intervals and pressure, and sets out from different angles. The optimum strike interval time and the optimal impact pressure of the pneumatic impact arc screen for Linxi Coal preparation Plant and most of the coal preparation plants were obtained, and compared with the two sections of fine coal slime arc screen in Huainan Panyi Coal preparation Plant. The experimental results show that the specified particle size of the arc screen is 0.125 mm, and the optimum interval time and pressure are 10 s and 0.1 MPA, respectively, for Linxi Coal preparation Plant. Compared with the original screening efficiency increased 21.32. For most coal preparation plants, when the particle size is 0.25mm, the optimum strike interval time and the optimal strike pressure are 4s and 0.3MPa, respectively. Its technological effect is better than the traditional non-strike arc screen and two-stage arc screen. Pneumatic impact arc screen can effectively control the upper limit of floatation feed size and provide favorable conditions for its effective separation in flotation.
【學位授予單位】：安徽理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD452

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