Spark Technology: Mill Trials

摘要

Discharging a high-energy spark underwater creates a shock wave which dissipates through an acoustic field. Thernhydroxyl radicals created by the field are able to mildly oxidize the surfaces of ink and toner particles, thereby decreasingrntheir zeta potential. This decrease inhibits the tendency of these particles to attach to fiber, which is negativelyrncharged. Pilot studies showed that sparking a mixture of ONP and OMG increased both brightness and yieldrnby 1% when the treated furnish was subsequently subjected to flotation deinking. The hydroxyl radicals are alsornable to oxidize the surface of microstickies and promote their agglomeration. The agglomerated particles are morerneasily rejected by reverse cleaners as shown in a full-scale trial. A mill trial also showed that the sparker improvedrnclarification efficiency in a DAF.