Clean Coal Production by Column Floatation Process

柱式浮选是低成本新一代选煤技术的发展方向之一。对于柱浮选系统，迄今为止，许多努力都集中在设备的优化和/或浮选效果的改善上。然而，很少有研究试图估计浮选结果与煤的特性之间的关系。对于简单的选煤工艺，我们采用了连续柱浮选系统。将阿达罗、瓦拉拉、埃尔梅洛、大同、泰黑等5个浮选厂的矿样在150μm以下粉碎过筛，考察了浮选柱系统中的脱矿情况，通过测定精煤和尾矿中无机元素的含量来评价浮选效果。此外，我们还考察了浮选过程中煤矿物分布及其平均粒度的变化。各稳态时间为试验开始后5~14min，Wallarah适合于连续浮选。另一方面，不同褐煤(帕西尔、阿达罗、贝劳)的浮选效果有不同的趋势。研究发现，柱浮选工艺是从低阶煤中回收含碳物质的一种较好的方法。这一过程非常简单，因此适合在亚洲国家应用。

Column flotation is one of the promising processes for the low-cost next generation coal cleaning technologies. As for the column flotation system, many efforts have focused on optimization of apparatus and/or improvement of flotation results so far. However there have been few studies that tried to estimate the relation of flotation results and characteristics properties of coal. We employed a continuous column flotation system for the simple coal cleaning process. Samples used in this study were Adaro, Wallarah, Ermelo, Datong, Taiheiyo, and they were crushed and sieved under 150μm. Then we investigated the demineralization in the column flotation system to estimate the flotation behavior by measuring the contents of inorganic elements in the cleaned coal and the tail refuse. Furthermore we investigated the change in the distribution of coal minerals and their average particle size during the flotation. Each steady state was 5〜14 min after starting the experiment.As a result, Wallarah was suitable for continuous column flotation. On the other hand, the flotation result of each brown coal (Pasir, Adaro, Berau) was different tendency. We found that column floatation process was a good way to recover carbonaceous materials from low rank coal. This process is very simple so it is suitable for application in Asian countries.