强化重力场下-0.5mm细粒煤重力分选基础研究

High efficiency and low cost separation for -0.5mm fine coal are always focused in coal preparation technology, the quantity of this fraction size become increase more and more, in addition separation technology challenges for fine coal produced by liberation from gravity separation middlings for the scarce coal in recent years, high efficient separation theory and technology for the purpose of desulfurization and de-ash of the fine coal are the key point of future research in the field of clean coal. From the angle of separation mechanism, stratified regularity and separation dynamics in enhanced gravity field of -0.5mm fine coal will be studied in the subject, rheological property of rotating flow membrane in enhanced gravity field will also be studied. And though high-speed dynamic analysis and rotating flow field simulation analysis, influence of flow state, velocity field and concentration field on separation effect will be studied, the motion trackes of different density particles in the film in enhanced gravity field conditions will also be studied, nonlinear dynamic equations of -0.5mm fine particles in different tiers will be established, separation rules and mechanism of -0.5mm fine coal in enhanced gravity field will be revealed, then change rule between separation efficiency and the main operating parameters will be gotten, to control it by mathematical model, Finally, -0.5mm fine coal will be separation in low-cost, low-pollution and high efficient separation.

-0.5mm级细粒煤的高效、低成本分选一直以来是国内外选煤技术研究的重点和热点，而这一粒级的数量在逐渐增多，加之近年来所针对的稀缺煤种重选中煤破碎解离再选所带来的细粒级分选技术挑战，使得以脱硫、降灰为宗旨的细粒煤的高效分选理论和技术是当前洁净煤领域研究的重点。 该课题将从分选机理的角度研究-0.5mm细粒煤在强化重力场中分层规律和分离动力学，研究强化重力场中旋转流膜的流变性，并借助于高速动态分析和旋转流场的模拟分析，研究流体在分选机转筒内的流动状态、速度场和矿浆浓度场对分选效果的影响，研究强化力场条件下流膜内不同密度颗粒的运动轨迹，建立-0.5mm细颗粒在不同分层区域的非线性动力学方程，揭示-0.5mm细粒煤在强化重力场中的分选规律和机理；得到分选效率与主要操作参数之间的变化规律，并通过数学模型进行控制，最终实现对-0.5mm细粒煤低成本、低污染、高效分选。

-0.5mm级细粒高硫煤、难浮煤的高效、低成本分选一直以来是国内外选煤技术研究的重点和热点，而这一粒级的数量在逐渐增多，加之近年来所针对的稀缺煤种重选中煤破碎解离再选所带来的细粒级分选技术挑战，也使细粒煤的高效分选理论和技术是当前洁净煤领域研究的重点。.本课题以强化重力分选技术为切入点，从基础分选机理的角度研究了细粒颗粒群在单离心力场、强化重力场中的松散分层规律，建立了分层区、分选区流膜厚度及分选粒度下限的数学模型，提出了强化重力场中全粒级分选自生介质理论，建立了强化重力场中矿物质脱除动力学模型；借助试验研究了颗粒群在强化重力场中的分层、迁移规律，通过高速动态观测及数值模拟方法研究了强化重力场流场特性，从微观层次深入分析了关键操作参数对分选过程的影响机制，完善了旋流梯度强化力场中分选理论。基于基础理论研究成果，开展了工艺参数组合分选试验，实现了对细粒煤强化力场中的高效脱硫、降灰，实现其中可解离的无机硫综合脱硫效率达到80%以上；在实验室试验的基础上，通过分选参数优化，探索出了适合我国细粒高硫煤洁净化的最佳工艺配置和最佳流程结构，为细粒煤高效重力分选装备的开发提供理论支持。