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Cleaning high ash coal waste from coking coal via froth flotation method
Particulate Science and Technology ( IF 2.5 ) Pub Date : 2021-11-30 , DOI: 10.1080/02726351.2021.2006382
Shiwei Wang 1, 2, 3 , Qian Xia 1 , Ruyou Gao 1
Affiliation  

Abstract

In this work, scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and laser particle size methods were employed. The surface of the particle obtained from the cyclonic-static microbubble flotation column (FCSMC) concentrate was coated with numerous small particles when compared to the clean coal collected from the Denver flotation cell. Even though the mass recovery of FCMSC concentrate (51.13%) was approximately twice the mass yield of Denver flotation cell concentrate (26.66%), the ash content in FCSMC concentrate (33.07%) was higher than that of the Denver flotation cell concentrate (14.88%). This result can be attributed to the advantages of FCSMC in small coal particle flotation, and this resulted in the misplacement of coarser particles with lower ash content in the tailing. The highest mass recovery of 0.250–0.500 mm in magnesium ion solution was 95.39%, which was slightly high than that (92.84%) in calcium ion solution. However, the concentrate ash content with 0.250–0.500 mm coarse size fraction in magnesium ion solution was 11.41%, which was higher than that (11.14%) in calcium ion solution. Flotation performances of different size fractions in rougher-cleaner flowsheet indicated that flotation responses in calcium ion solution were better than that in magnesium solution.



中文翻译:

泡沫浮选法清选炼焦煤中高灰分煤矸石

摘要

在这项工作中,采用扫描电子显微镜 (SEM)、X 射线光电子能谱 (XPS)、X 射线衍射 (XRD) 和激光粒度测量方法。与从丹佛浮选槽收集的精煤相比,从旋流静态微泡浮选柱 (FCSMC) 精矿获得的颗粒表面覆盖有许多小颗粒。尽管 FCMSC 精矿的质量回收率 (51.13%) 约为丹佛浮选槽精矿质量收率 (26.66%) 的两倍,但 FCSMC 精矿中的灰分含量 (33.07%) 高于丹佛浮选槽精矿的灰分含量 (14.88) %)。这一结果可归因于 FCSMC 在小煤颗粒浮选中的优势,这导致尾矿中灰分含量较低的粗颗粒错位。镁离子溶液中0.250~0.500 mm的最高质量回收率为95.39%,略高于钙离子溶液的质量回收率(92.84%)。而镁离子溶液中粗粒度分数为0.250~0.500 mm的精矿灰分含量为11.41%,高于钙离子溶液中的灰分含量(11.14%)。粗滤流程中不同粒度级分的浮选性能表明,钙离子溶液中的浮选响应优于镁溶液中的浮选响应。

更新日期:2021-11-30
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