Abstract : aimed at solving the problem that high content of unburned carbon is unfavourable for the comprehensive ultilization in scale of fly ash , the fundamental principle that separation of unburned carbon from fly ash is theoretically analyzed by wet flotation and dry electro - separation , three factors and two levels orthogonal test for flotation and two factors and three levels test for electro - separation were conducted , furthermore , the primary factors and law affecting separating efficiency in flotation and electro - separation were obtained . the results show that wet flotation can give 7 . 34 % of the cleaned coal yield rate , which contains 44 . 53 % of ash content and 56 . 02 % of separating efficiency , while dry electro - separation can reduce the content of carbon in separated fly ash to 3 . 16 % and remove 53 . 12 % of carbon from fly ash 文摘:针未燃炭含量过高不利对粉煤灰大规模综合利用的问题，从理论上分析了粉煤灰湿法浮选和干法电选分选未燃炭的基本原理，进行了三因素二水平正交浮选试验和二因素三水平的正交电选试验研究，得到了影响浮选和电选分选效果的主要因素及其规律.试验表明:采用湿法浮选法可获得精煤产率为7 . 34 % ，灰分为44 . 53 % ，分选效率为56 . 02 %的分选效果；采用干法电选，选后粉煤灰的含碳量可降到3 . 16 % ，脱碳率达53 . 12 %
