Dielectric properties and microwave heating behaviour of a recycled copper blast furnace ash

Abstract

ABSTRACT Aiming at the problem that persistent organic pollutants (POPs) are difficult to degrade under traditional process conditions, this paper studies the dielectric properties and temperature rise characteristics of regenerated copper ash in microwave field to provide theoretical support for the removal of POPs under microwave conditions. The experimental results show that the dielectric constant (), dielectric loss factor () and the loss tangent () increase with the bulk density. The value of increases with temperature, the values of and first increase and then decrease with the temperature. When ρ = 0.76 g/cm3, increased from 6.5 to 10.136, the maximum values of and were 0.0627 and 0.0983. When ρ = 1.06 g/cm3, increased from 7.5 to 34.472, the maximum values of and were 0.344 and 0.0385. When ρ = 1.36 g/cm3, increased from 9 to 34.146, the maximum values of and were 0.386 and 0.040. In addition, the higher the microwave power, the faster the copper ash temperature rises, and the water content promotes the heating speed.