ABSTRACT

This study carried out component sulfur composition analysis, electron probe microscopic analysis, and particle size and density composition analysis of coal samples from a coal preparation plant in Liupanshui. The influence of various factors on the indexes of clean coal products under different separation medium conditions by enhanced gravity separation technology, including water medium (WM), magnet powder suspension (MPS), and zinc chloride solution (ZCS), is discussed. The results show that the addition of MPS or ZCS has an obvious improvement on coal deashing and desulfurization compared with the WM separation, especially the separation effect of ZCS, which is better than that of MPS because of better uniformity and stability of ZCS. The addition of MPS or ZCS can help the materials stratify strictly according to the density to enhance the sorting function. The clean coal ash and sulfur content are reduced to 13.24% and 2.51%, while the combustible recovery and desulfurization efficiency are up to 71.46% and 49.27%, respectively, under the optimal condition.

摘要

本研究对六盘水某选煤厂的煤样进行了组分硫组成分析、电子探针显微分析以及粒度和密度组成分析。探讨了水介质(WM)、磁粉悬浮液(MPS)、氯化锌溶液(ZCS)等强化重选技术在不同分离介质条件下各因素对精煤产品指标的影响。结果表明，添加MPS或ZCS与WM分离相比，对煤的脱灰脱硫有明显改善，尤其是ZCS的分离效果优于MPS，ZCS的均匀性和稳定性更好。加入MPS或ZCS可使物料严格按密度分层，增强分选功能。在优化条件下，精煤灰分和硫分分别降低到13.24%和2.51%，可燃物回收率和脱硫效率分别达到71.46%和49.27%。