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Non-coking coal preparation by novel tribo-electrostatic method

机译：新型摩擦静电法制备非焦煤

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A new laboratory fluidised bed tribo-electrostatic separator has been assembled and the beneficiation potential of thermal non-coking coal from Hingula block of Talcher coal field, India, is examined on this separator. The uniqueness of the separator originates from the efficient tribo-electrification of coal material in the cylindrical fluidised bed with internal baffle system. The collecting bins of the material underneath the copper plate electrodes are designed to function as Faraday cups such that the charge polarity and magnitude of particles in each bin can be measured directly. The liberation attributes of coal material is assessed by sink and float analysis of various size fractions. The mineral and maceral composition is determined by XRD and petrographic analysis. The separation tests were conducted at different tribo-charging and applied voltage conditions. The material collected in bins close to positive and negative electrodes show an ash content of 61% and 8% respectively, illustrating differential charge acquisition of mineral rich and coal rich particles during tribo-electrification. The charge results are in good agreement with the ash content of the coal material collected in the bins. The results showed that a clean coal of about 15% ash can be obtained from a coal containing 30% ash with about 70% yield. A better separation results can be achieved by recycling the material. The ash content in the clean coal is however limited by the liberation characteristics of the coal, which is evidenced by the SEM analysis of the particles in different bins. Thus, the tribo-electrostatic method observed to be a promising dry coal preparation technique.
机译：组装了新的实验室流化床摩擦静电分离器，并在此分离器上研究了印度塔尔彻煤田Hingula区块的热非结焦煤的选矿潜力。分离器的独特性源自具有内部挡板系统的圆柱形流化床中煤材料的高效摩擦起电。铜板电极下方的材料收集箱设计为用作法拉第杯，以便可以直接测量每个箱中的电荷极性和颗粒大小。煤的释放属性通过各种尺寸馏分的下沉和漂浮分析进行评估。矿物和宏观组成由XRD和岩石学分析确定。分离测试是在不同的摩擦充电和施加电压条件下进行的。收集在靠近正极和负极的垃圾箱中的物质的灰分分别为61％和8％，这说明在摩擦带电过程中，富矿物质和富煤颗粒的电荷不同。装料结果与收集在垃圾箱中的煤料的灰分非常吻合。结果表明，可以从含30％灰分的煤中以约70％的收率获得约15％灰分的清洁煤。通过回收材料可以实现更好的分离效果。然而，清洁煤中的灰分含量受煤的释放特性限制，这通过不同仓中颗粒的SEM分析得到证明。因此，摩擦静电法被认为是一种有前途的干煤制备技术。

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