Deinking Flotation Cell Efficiency: How to Achieve ISO Brightness Above 90% | Leizhan

Flotation Deinking Efficiency Determines Final Cultural Paper Brightness

Deinking flotation cells remove ink particles through air bubble attachment. A high-efficiency flotation system achieves 85-92% ink removal in a single pass, lifting pulp brightness from 45-55% ISO to 62-68% ISO. Combined with washing and dispersion, final brightness above 90% ISO is achievable for writing and printing grades.

FAQ

How many flotation stages are needed for cultural paper?

2-stage flotation is standard. Primary removes 80-85% of ink; secondary captures remaining 7-10%. 3rd stage only for tissue-grade requiring >85% ISO without bleaching.

What air bubble size is optimal for deinking?

0.3-0.8 mm diameter. Venturi-type aerators produce the most consistent bubble size distribution for optimal ink attachment.