Roles of Surfactants in Flotation Deinking Yulin Zhao, Yulin Deng, and J.Y. Zhu INTRODUCTION Flotation deinking is a common practice for removing ink from wastepaper, and it is becoming a key process in many recycling paper mills. Flotation deinking was successfully introduced to the paper recycling industry in the 1980s, and
in deinking flotation of old newspapers. The mecha-nism by which calcium improves the flotation effi-ciency of ink particles has been a subject of con sid-erable research …
After chemical or enzymatic treatment of pulp, flotation was performed using Voith Delta 25™ laboratory flotation cell with a cell capacity of 23.6 L. Pulp slurries diluted at 1.0% consistency were subjected to pre-mixing for 5 s without air flow ensuring the mixing of surfactant throughout the pulp suspension.
DOI: 10.1016/J.RNREC.2011.06.013 Corpus ID: 108968548; Column Flotation Deinking: State-of-the-art and opportunities @article{Vashisth2011ColumnFD, title={Column Flotation Deinking: State-of-the-art and opportunities}, author={Subhashini Vashisth and Chad P. J. Bennington and John R. Grace and Richard J. Kerekes}, …
In flotation deinking, air bubbles rise through agitated liquids in tanks containing suspended cellulose pulp and contaminant particles.The rising bubbles collect …
In addition to hydrodynamics, surface chemistry plays a vital role in determining the deinking efficiency. Various properties and sub-processes occurring …
Over decades, original WEMCO flotation cells built their reputation on delivering the highest recovery. WEMCO II builds on the success of its predecessor by offering more …
Modern deinking surfactants are intended to not just improve the repulping process but carry through to the flotation cells where they contribute to more efficient collection of ink by the air and a froth that breaks down more easily. The effect is the ability to get higher brightness at lower equivalent yield loss as shown in the Figure 4.
process designs and flotation cells. A study comparing the results of each plant's deinking system performance identified differences in flotation cell operating conditions [1], the effects of which were not well understood. In many plants studied, the operating consistency of flotation cells had been elevated above design levels to increase
wem deinking flotation cell; WEMCO 1+1 Flotation Machines. WEMCO 1+1 Flotation cells are commonly used in coarse float applications such as phosphate and potash with feeds of up to 85% plus 65 mesh an maximum particle sizes as large as 10 12 mesh Flexible, Modular Tank and Box Design The basic module of the WEMCO 1+1 Flotation …
By using the optimized flotation conditions, the deinked pulp brightness can reach 83.15%ISO, 10.96%ISO higher than that of the control, the effective residual ink concentration reduction is 207.39 mg/kg, actual deinking efficiency is up to 59.4%. The deinking experiments confirmed its superior performance of the laboratory cell.
A comprehensive review of the history of flotation deinking and modern flotation deinking cells was published by Finch and Hardie (1999). Another review on the design of modern deinking plant and new technologies (such as sticky-flotation, flotation de-ashing, froth washing, and flotation in a centrifugal field) was provided by Kemper …
The development of deinking flotation cells has been an evolutionary one starting with a transfer of the Denver cell from the mineral processing industry in the 1950s. It can be seen that the pace of major developments has increased since the end of the 1970s. TABLE 1 History of flotation deinking cells (modified from McCool, [3]) ~en,er …
The Jameson Flotation Cell Technology is owned by GlenCore. The heart of the technology is the machine's ability to create small uniform air bubbles.
Commercial flotation deinking cells cover a great range of air flow rates (from 20% up to 1000%) but most units operate at a rate below . However, in flotation, not only the volume of air but ...
deinking systems The SelectaFlot deinking cell is the result of decades of system and component experience and is based on the sound knowledge of technology and operating experience. Multi-injector and flotation cells The pulp suspension is pumped through the multi-injectors into the flotation cells. Benefits Inside the patented injector, the ...
The use of flotation in large scale to remove ink from wastepaper followed the development of deinking flotation cells. This started with the employment of the Denver Cell from the mineral processing industry in the 1950s and has increased steadily (Finch and Hardie, 1999). Over the last two decades, the removal of ink from …
By using the optimized flotation conditions, the deinked pulp brightness can reach 83.15~ISO, I0.96~01SO higher than that of the control, the effective residual ink concentration reduction is 207.39 mg/kg, actual deinking efficiency is up to 59.4%. The deinking experiments confirmed its superior performance of the laboratory cell. …
Flotation deinking is the most widely used deinking technology, and the other methods used for deinking are bleaching deinking, enzymatic deinking, and washing deinking, etc. [8, 9]. The ...
In general, surfactants play three roles in flotation deinking (1, 4): as a dispersant to separate the ink particles from the fiber surface and prevent the redeposition of …
Flotation deinking is a common practice for removing ink from wastepaper, and it is becoming a key process in many recycling paper mills. Flotation deinking was successfully introduced to the paper recycling industry in the 1980s, and its applications in wax removal, sticky control, and fiber fractionation have attracted great research …
Flotation deinking is a separation process in which swarms the size range of approximately 20 to 300 gm in diameter. of air bubbles …
Column flotation deinking is a critical sub-system in paper recycling to produce the highest quality product at low cost. Among the benefits of column flotation are higher selectivity, …
Flotation de-inking technology is used in the paper recycling process to preferentially remove hydrophobic contaminants, such as inks and toners from a slurry of fibers in water. In the process fine air bubbles are introduced into the suspension and the hydrophobic contaminants, preferentially attached to the bubble–water interface, are …
Column flotation deinking is a critical sub-system in paper recycling to produce the highest quality product at low cost. Among the benefits of column flotation are higher selectivity, smaller floor space requirement, lower capital cost and reduced operating and maintenance costs (Finch and Dobby, 1990).Vertical columns result in considerable floor space …
Flotation deinking is a complete process. A better understanding of its fundamentals would help in developing models that can predict whether a given process change would help flotation performance before attempting an expensive mill trial. Knowledge of flotation fundamentals can also be used to improve equipment design …
and the flotation cell tank. While the aeration element injects air and allows through mixing of air bubbles into the stock, the tank provides sufficient space to remove ink-laden bubbles from the suspension. ECO CELL FLOTATION CELL (Fig. 1 & 2) The ECO Cell Flotation machine comprises of mixing cell followed by 3 to 6 primary flotation cell in ...
Between different flotation systems, cells and injectors can vary considerably eg. in size, shape and internal design and this can give rise to variation in deinking efficiency …
This study investigates techno-economic aspects of wastepaper recycling to optimize process efficiency and operating cost. The deinking was carried out using pulping followed by froth flotation. The development of a waste management process was achieved employing refinery wastewater to provide chemical reagents in pulping. Ozone …