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Study on maceral characteristics and separation of low-rank coal
International Journal of Coal Preparation and Utilization ( IF 2.1 ) Pub Date : 2022-05-23 , DOI: 10.1080/19392699.2022.2078811
Fangyuan Ma 1 , Youjun Tao 2
Affiliation  

ABSTRACT

This paper studies the characteristics of Shenhua low-rank coal, including industrial analysis, element analysis, density composition, particle-size composition, maceral characteristics and enhanced gravity. The separation characteristics of Shenhua low-rank coal maceral were examined by manual enrichment, screening enrichment and centrifugal heavy-liquid separation. After manual enrichment, vitrinite content was 31.06% higher than vitrinite content in raw coal, and inertinite content was increased by 13.50% compared with raw coal. The screening results show that vitrinite is easily broken into small pieces to be enriched in coarser particle size (0.125–0.074 mm), and inertinite is easily enriched in fine particle size (−0.045 mm); Centrifugal heavy-liquid separation showed that product in range of −1.30 g/cm3 was taken as pure vitrinite and product in range of 1.36–1.40 g/cm3 was regarded as purer inertinite. Finally, using rod mill products as feed material of enhanced gravity separation to study effect of feed speed, rotation frequency and recoil water on vitrinite recovery, vitrinite recovery of 71.81% and vitrinite content of 68.72% are obtained respectively under the optimal conditions of 30 Hz rotation frequency, 0.03 MPa recoil water pressure and 15 ml/s feed speed.



中文翻译:

低阶煤的显微特征及分选研究

摘要

本文研究了神华低阶煤的工业分析、元素分析、密度组成、粒度组成、显微特征和增强重力等特征。采用人工富集、筛分富集和离心重液分离等方法对神华低阶煤显微分的分离特性进行了考察。人工富集后镜质体含量比原煤镜质体含量高31.06%,惰质体含量比原煤高13.50%。筛分结果表明,镜质体易破碎成小块富集于粗粒度(0.125~0.074 mm),惰质体易富集于细粒度(-0.045 mm);离心重液分离表明产物在-1.30 g/cm 3范围内被视为纯镜质体,1.36–1.40 g/cm 3范围内的产品被视为更纯的惰性体。最后,以棒磨机产品为强化重选给料,研究进料速度、转速和反冲水对镜质体回收率的影响,在30 Hz的最佳条件下分别获得71.81%的镜质体回收率和68.72%的镜质体含量。旋转频率、0.03 MPa 反冲水压和 15 ml/s 进料速度。

更新日期:2022-05-23
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