CV-jet treatment for process water and flotation rejects in deinking, 2010 TAPPI PEERS Conference

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A new technology using a fluid-jet cavitation (CV-jet) has been developed in order to improving the quality of secondary fibers. The effects of CV-jet treatments for both the process water and flotation rejects in the deinking processes were investigated in terms of the number of dirt speckles, the effective residual ink concentration (ERIC), the brightness, and the number of stickies in the treated samples. The results showed that CV-jet treatments decreased the number and size of dirt speckles in the process water, and the treatments also facilitated ink detachment from the fines in the water. The brightness of the fines after CV-jet treatments was also improved by the subsequent flotation. In addition, the number of macrostickies in the process water was decreased by the CV-jet treatment. The amount of hydrophobic materials adsorbed on the quartz crystal microbalance (QCM) sensor, which serving as an index of microstickies, was also decreased when the sample was treated with the CV-jet. Similar results were obtained from the treatments of flotation rejects or froth in the deinking process. These indicated that CV-jet treatments improved the quality of the fines in the process water and flotation rejects, which were difficult to improve by conventional deinking devices. Therefore, the CV-jet technology has the potential to improve deinking process.