ABSTRACT

In this paper, the enhanced gravity separation of maceral components was studied based on the characteristics of maceral components for low-rank coal from Shendong. Vitrinite and ash content were only 48.42 and 8.77%, respectively. Rod mill grinding showed that the optimal grinding time was 10 min based on the vitrinite content and vitrinite recovery which reached maximum 81.34 and 80.85%, respectively. Maceral separation test conducted with the Falcon concentrator showed that using optimal conditions of rotary frequency 30 Hz, feed dosage 15 ml/s and recoil water pressure 0.03 Mpa, the best vitrinite content, benefication ratio and vitrinite recovery were 67.25%, 1.16, and 72.48%, respectively. With the increase of rotary frequency or decrease of recoil water pressure, the finer particles in each particle fraction became more underflow products, and these finer particles in underflow products were all high-density products with density higher than 1.35 g/cm³. Because the content of vitrinite was higher in the coarser particles, the average particle size of the original overflow product was directly reduced by these fine particles entering the overflow product, which caused the decrease of vitrinite content and the increase of vitrinite recovery.

摘要

本文针对神东低阶煤矿物成分的特点，研究了矿物成分的强化重选。镜质体和灰分含量分别仅为 48.42% 和 8.77%。棒磨机研磨表明，最佳研磨时间为10 min，根据镜质体含量和镜质体回收率分别达到最大值81.34和80.85%。用Falcon选矿机进行的微晶分离试验表明，在旋转频率30 Hz、进料量15 ml/s、反冲水压力0.03 Mpa的最佳条件下，最佳镜质体含量、选矿率和镜质体回收率分别为67.25%、1.16和72.48。 ％， 分别。随着旋转频率的增加或反冲水压力的降低，每个颗粒级分中较细的颗粒成为更多的底流产物，³ . 由于较粗颗粒中镜质体含量较高，这些细颗粒进入溢流产物直接降低了原溢流产物的平均粒径，导致镜质体含量降低，镜质体回收率增加。