ABSTRACT

There is literature inadequacy for the application of high internal phase water-in-oil (HIP W/O) emulsion on agglomeration and flotation of weathered discards from coal discard dumps. In this study, two oxidized coal discards were beneficiated using W/O HIP emulsion technique. The performance of the W/O emulsion technique with an internal dispersed water phase of 95 vol% was compared with that of pure 100% kerosene. Response surface methodology was applied in the optimization of the two low-grade discard coals to generate mathematical regression equations to predict the response of the ash content and calorific value of clean coal products. The feed calorific value of 8.48 MJ/kg and 16.29 MJ/kg increased to 19.45 MJ/kg and 28.12 MJ/kg for discard coal 1 and 2, respectively. This was achieved with 5 kg/ton of emulsion binder, which is 0.25 kg/ton of organic dosage and at an agitation speed of 1800 rpm. A clean coal product with 19.05 MJ/kg and 27.20 MJ/kg was achieved under 5 kg/ton of pure 100% organic kerosene dosage. Statistical tools: Pred. R² and Adj. R² were established and confirmed the accuracy of the developed models. Overall, this study shows that the emulsion binder could upgrade weathered discard coal dumped for over three decades and achieved better quality product compared to kerosene.

摘要

将高内相油包水 (HIP W/O) 乳液应用于煤废弃物堆放风化废弃物的团聚和浮选方面的文献不足。在这项研究中，使用 W/O HIP 乳化技术对两种氧化煤废弃物进行了选矿。将具有 95 vol% 内部分散水相的 W/O 乳液技术的性能与纯 100% 煤油的性能进行了比较。将响应面法应用于两种低品位废煤的优化，生成数学回归方程来预测精煤产品灰分和热值的响应。弃煤1和2的饲料热值分别从8.48 MJ/kg和16.29 MJ/kg增加到19.45 MJ/kg和28.12 MJ/kg。这是通过 5 千克/吨乳液粘合剂实现的，即 0。25 公斤/吨有机物用量，搅拌速度为 1800 rpm。在5公斤/吨纯100%有机煤油用量下，得到19.05 MJ/kg和27.20 MJ/kg的精煤产品。统计工具：Pred。R²和调整。R ²成立并证实了所开发模型的准确性。总的来说，这项研究表明，与煤油相比，乳液粘合剂可以升级被倾倒了 30 多年的风化废弃煤，并获得了质量更好的产品。