【摘要】：針對(duì)傳統(tǒng)重選中顆粒粒度降低物料密度分選效果、限制設(shè)備處理能力等問題,結(jié)合流化床流化作用和斜板沉降作用,利用在流化床上添加傾斜板組來研究物料的分離分選。傾斜通道中流體速度分布特點(diǎn)和剪切提升作用為弱化顆粒粒度影響、強(qiáng)化顆粒密度分選提供了條件。論文主要運(yùn)用運(yùn)動(dòng)學(xué)、動(dòng)力學(xué)來分析傾斜通道中固體顆粒運(yùn)動(dòng),分別建立顆粒粒度對(duì)顆粒運(yùn)動(dòng)影響關(guān)系式、顆粒受到的水速與顆粒粒度關(guān)系方程以及顆粒平衡位置與顆粒性質(zhì)的關(guān)系方程。借助于模型顆粒的試驗(yàn)研究,從而對(duì)所建關(guān)系進(jìn)行驗(yàn)證與修正。論文以單一沉降特性顆粒運(yùn)動(dòng)模型為基礎(chǔ),推導(dǎo)出通道內(nèi)密度與粒度對(duì)多顆粒分離的影響關(guān)系:Lpd =k△ρ2.45/d1.14。分別研究玻璃珠顆粒(0.2-0.4mm、0.4-0.6mm)和磁鐵礦粉顆粒(0.2-0.3mm)在不同水速與板間距下的運(yùn)動(dòng)軌跡,試驗(yàn)結(jié)果表明6mm板間距通道內(nèi)顆粒的運(yùn)動(dòng)軌跡發(fā)生明顯變化且物料分離過程中顆粒粒度影響作用弱化。通過對(duì)層流條件下傾斜通道中顆粒的速度平衡和受力平衡分析,推導(dǎo)出水速與顆粒特性間關(guān)系式:U'=0.0479d0.14(ρp-ρf)-0.71g0.71z/ρ0.29fμ0.43,以及顆粒遠(yuǎn)離板面時(shí)速度平衡位置x1與受力平衡位置(?)并提出表征物料分離能力η。分使用0.09m/s和0.15m/s的水速可將0.2-0.8mm玻璃珠和0.125-0.3mm磁鐵礦粉選出,進(jìn)一步驗(yàn)證了傾斜通道弱化粒度影響的研究結(jié)果。并采用干擾沉降理論解釋了小于0.5mm玻璃珠的分選效果。因而,利用平衡關(guān)系可預(yù)測(cè)出不同水速物料的有效分選粒度范圍和預(yù)測(cè)給定粒度物料所需分選水速。運(yùn)用平衡關(guān)系方程預(yù)測(cè)6mm板間距下0.25-2mm煤泥分選水速為0.065m/s。依次采用 0.0315m/s,0.0473m/s,0.0699m/s 以及 0.0896m/s 的上升水速回收 2kg煤泥顆粒,比較煤泥分選試驗(yàn)與浮沉試驗(yàn),確定使用0.07m/s的水速分選煤泥顆粒,將25.68%的原煤灰分降到12%左右,精煤產(chǎn)率為65%。
[Abstract]:Aiming at the problems of reducing the separation effect of material density and limiting the treatment ability of equipment by traditional re-selecting particle size, the separation and separation of materials was studied by adding tilting plate group to the fluidized bed in combination with fluidized bed fluidization and inclined plate settlement. The characteristics of fluid velocity distribution and shear lifting in inclined channels provide conditions for weakening particle size and enhancing particle density separation. In this paper, kinematics and dynamics are used to analyze the motion of solid particles in inclined channels, and the relationship between particle size and particle motion is established. The relation equation between water velocity and particle size and the relationship between particle equilibrium position and particle properties are obtained. By means of the experimental study of the model particles, the relationship is verified and corrected. Based on the model of single settling particle motion, the relationship between particle size and density in channel on multi-particle separation is deduced. The relation between particle size and particle size is: LPD / k 蟻 2.45 / d 1.14. The motion trajectories of glass beads (0.2-0.4mm) and magnetite particles (0.2-0.3mm) at different water velocities and plate spacing were studied. The experimental results show that the movement trajectory of particles in the gap channel of 6mm plate is obviously changed and the effect of particle size is weakened in the process of material separation. Based on the analysis of velocity balance and force balance of particles in inclined channel under laminar flow condition, the relationship between water velocity and particle characteristics is derived. The relationship between water velocity and particle characteristics is derived from the formula: 0. 0479d0.14 (蟻 p- 蟻 f) -0.71g0.71z/ 蟻 0.29f 渭 0.43, and the velocity equilibrium position x1 and the force balance position when particles are far away from the plate surface (?) The material separation ability 畏. The 0.2-0.8mm glass beads and the 0.125-0.3mm magnetite powders can be selected by using 0.09m/s and 0.15m/s separately, which further verifies the results of the study on the effect of the slanting channel on the weakening particle size. The separation effect of glass beads less than 0.5mm is explained by the theory of interference settlement. Therefore, the effective separation granularity range of different water speed materials and the separation speed required for given size materials can be predicted by using the equilibrium relation. The equilibrium equation is used to predict the separation water velocity of 0.25-2mm slime at 6mm plate spacing of 0.065 m / s. 0.0315 m / s / s 0.0473m / s 0.0699m / s and 0.0896m/s 's rising water speed were used to recover 2kg slime particles respectively. Comparing slime separation test with floatation test, it was determined that using 0.07m/s to separate slime particles at water speed, the ash content of raw coal was reduced to about 12%, and the yield of refined coal was 65%.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD94;TD45

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