School of Chemical & Environmental Engineering,China University of Mining and Technology-Beijing
State Key Laboratory of Mineral Processing
CCTEG Goal Mining Research Institute
School of Minerals Processing and Bioengineering,Central South University
Yibin Tianyuan Kechuang Design Co. ,LTD

为了提高重介质旋流器对高含量重密度组分难选原煤的分选效率,设计了新型重介质旋流器模型装置,建立了颗粒在离心旋转流场中沉降分离数学模型,采用试验与理论分析相结合的方法研究新型重介质旋流器的分选特性,揭示高含量重密度组分难选煤分选特性随工艺参数的变化规律,探索影响新型重介质旋流器流场工作悬浮液动态稳定性的因素及重产物排料输运机制。研究结果表明,新型重介质旋流器分选高含量重密度组分煤时,底流重产物排料能力强、处理量大;离心旋流场中的悬浮液密度梯度分布小、密度相对均匀,底流与溢流密度差值较低,流场中悬浮液稳定性更强;入料的压力与悬浮液动态稳定性、分选精度及重产物排料效率直接相关,随着入料的压力增大,底流、溢流口排出悬浮液密度差值增大,可能偏差E值降低,分选精度提高,重产物排出量升高;当入料的压力为25kPa时,实际分选密度为1.666g/cm3,可能偏差E值为0.09g/cm3,重产物产率为75.23%。本研究为高含量重密度组分煤的分选提供了新的思路。

This study attempts to enhance the separation efficiency of dense media cyclone for raw coalfeed with difficult-to-cleaning and large high-density component content. Specifically,this paper 1) designed a novel heavy media cyclone model device, 2 )established a mathematical model ofsedimentation separation of particles in the centrifugal rotating flow field,3) investigated the separationcharacteristics of the new dense media cyclone by combining experimental research and theoretical analysis,which revealed the separation variation patterns of raw coal difficult to select with high contentheavy density components under different process parameters,4) explored the factors affecting the dynamic stability of the working suspension in the flow field of the new heavy media cyclone and the discharge and transportation mechanism of heavy products. Results show that when the new dense mediacyclone separates raw coal with high content of heavy density components,underflow heavy products exhibit stronger discharge capacity and higher processing capacity,while the centrifugal swirl field showssmaller density gradient distribution of suspension,more uniform density distribution,lower value of thedifference between the underflow and the overflow density,as well as stronger stability of the suspensionin the flow field. The feeding pressure is directly correlated with the dynamic stability of the suspension,separation accuracy and the discharge efficiency of heavy products. With increasing feeding pressure,the suspension discharged from the underflow and overflow port shows increased density difference,reduced possible deviation E value,improved separation accuracy and elevated amount of heavy productdischarged. When the feeding pressure is 25 kPa,the actual separation density is 1. 666 g / cm3,the possible deviation E value is 0. 09 g / cm3,and the yield of heavy products is 75. 23% ,which provides newinsights into the separation of raw coal with high content,heavy density components.

矿物加工科学与技术国家重点实验室开放基金(BGRIMM-KJSKL-2023-14);北京市自然科学基金面上项目(2232067);宜宾市引进高层次人才项目(2022YJ04)

赵龙,朱学帅,韦鲁滨,等.高含量重密度组分煤重介质旋流器分选特性研究[J].矿业科学学报,2024,9(1):098-105.

ZHAO Long,ZHU Xueshuai,WEI Lubin,et al. Study on separation characteristics of dense medium cyclone for raw coal with high density fraction con-tents[J]. Journal of Mining Science and Technology,2024,9(1):098-105.