不同粒级煤超声电化学浮选脱硫脱灰的研究

Desulfurization and deashing for various grain sizes of coal by ultrasonic electrochemical flotation

采用超声电化学增强浮选的方法研究了酸性条件下不同粒级煤样中的形态硫及灰分的脱除。结果表明,煤样粒级越小浮选精煤收率越高,脱硫、脱灰效果越显著。小于0.075 mm的煤样脱硫、脱灰效果最好,其浮选收率可达93.05%,总脱硫率为72.97%,黄铁矿硫减少89.12%,硫酸盐硫减少64.23%,有机硫减少59.11%,脱灰率为41.17%。FT-IR、XRD分析结果表明,超声电化学能改善煤样表面性质、增大接触角,从而提高浮选精煤收率及脱除煤中各形态硫和易成灰的亲水性矿物质。

The removal of sulfur and ash in coal samples with different grain sizes is studied by using ultrasonic electrochemical enhanced flotation method under acidic conditions.Results indicate that the smaller the coal sample size,the higher the flotation coal yield,as well as the more significant the desulfurization and deashing effect.As for the coal samples with a grain size less than 0.075 mm,this method delivers the best desulfurization and deashing effect,over which the flotation yield reaches 93.05%,total desulfurization rate is 72.97%,the content of sulfur in the form of pyrite decreases by 89.12%,the content of sulfur in the form of sulfates drops by 64.23%,the content of organic sulfur is reduced by 59.11%,and the removal rate of ash achieves 41.17%.FT-IR and XRD analysis shows that ultrasonic electrochemistry can improve the surface properties of coal samples and increase their contact angle,so as to increase the yield of flotation refined coal and remove various forms of sulfur and hydrophilic minerals that are easy to become ash.