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Rapid beneficiation of fine coal tailings using a novel agglomeration technology
Fuel Processing Technology ( IF 7.5 ) Pub Date : 2018-07-01 , DOI: 10.1016/j.fuproc.2018.03.033
K. van Netten , K.P. Galvin

Abstract Froth flotation has been used successfully over the last century for the beneficiation of coal and mineral particles. However, the process has been affected by certain restrictions relating to the rate at which the bubble/particle concentrate segregates from the aqueous tailings and to the recovery of ultrafine particles. An alternative separation technique, which appears to have the potential to remove these limitations, is selective agglomeration using a high internal phase emulsion binder. Presented in this paper are the findings from an investigation into the continuous steady state processing of fine coal tailings using the emulsion binder. This coal was sourced from a hydrocyclone overflow and had an ash% of 42%. The results from the experiments are compared to the results obtained from a batch system. It was found that both systems achieved a high combustible recovery of 70–80% and low product ash of 15–17%, however, the continuous process needed at least 15% less organic liquid to achieve agglomeration. Moreover, filtration of the agglomerated product material subjected to further high shear demonstrated low moistures of approximately 16 wt%. Therefore, it appears that agglomeration using the emulsion binder offers a method for producing valuable products from fine coal tailings.

中文翻译:

使用新型团聚技术快速选矿粉煤尾矿

摘要 泡沫浮选在上个世纪已成功用于选矿煤和矿物颗粒。然而,该工艺受到与气泡/颗粒浓缩物从含水尾矿分离的速率和超细颗粒回收率相关的某些限制的影响。另一种分离技术似乎有可能消除这些限制,它是使用高内相乳液粘合剂的选择性附聚。本文介绍了使用乳液粘合剂对细煤尾矿进行连续稳态处理的调查结果。这种煤来自水力旋流器溢流,灰分百分比为 42%。将实验结果与从批处理系统获得的结果进行比较。结果表明,两种系统都实现了 70-80% 的高可燃物回收率和 15-17% 的低产品灰分,然而,连续工艺需要至少 15% 的有机液体才能实现团聚。此外,经过进一步高剪切的附聚产品材料的过滤显示约16重量%的低水分。因此,使用乳液粘合剂的附聚似乎提供了一种从细煤尾矿生产有价值产品的方法。
更新日期:2018-07-01
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