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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Large-scale design and testing of an improved fine coal dewatering system
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Large-scale design and testing of an improved fine coal dewatering system

机译：改进的细煤脱水系统的大规模设计和测试

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Fine coal (-500 μm) is notoriously difficult to dewater. It is not uncommon for a dewatered product to have a moisture content as high as 30 per cent after vacuum filtration. This poses several handling and financial problems to such an extent that a lot of fine coal is discarded onto slurry waste ponds. A novel way of dewatering fine coal was developed at North-West University. It entails deliberately damaging the filter cake during dewatering to allow for an increased flow of air through the cake at the expense of the applied pressure differential. This method resulted in an average improvement in final cake moisture of between 3 per cent and 5 per cent when executed in the laboratory under controlled conditions. A device was designed that could be fitted onto existing belt filters that would damage the filter cake as it passes by. This device was tested on a vacuum belt filter installation at a coal beneficiation operation in the Waterberg coal field in South Africa. The results showed a 3 per cent reduction in final moisture of the cake, proving the validity of the method at full industrial scale.
机译：众所周知，细煤（-500μm）难以脱水。在真空过滤后，脱水​​产品的水分含量高达30％并不少见。这带来了一些处理和财务问题，以致于将许多细煤丢弃到浆料废物池中。西北大学开发了一种新型的细煤脱水方法。这需要在脱水期间故意损坏滤饼，以允许增加的空气通过滤饼的流量，但以所施加的压差为代价。当在受控条件下在实验室中执行此方法时，最终的蛋糕含水量平均提高了3％至5％。设计了一种可以安装在现有带式过滤器上的装置，该装置会在滤饼通过时损坏滤饼。该设备已在南非Waterberg煤田的选煤厂的真空带式过滤机上进行了测试。结果表明，蛋糕的最终水分减少了3％，证明了该方法在整个工业规模上的有效性。

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