4 edition of Deinking wastepaper in an open and packed flotation column found in the catalog.
Deinking wastepaper in an open and packed flotation column
Brian Michael Petri
Thesis (M.A.Sc.) -- University of Toronto, 1994.
|Series||Canadian theses = -- Thèses canadiennes|
|The Physical Object|
|Pagination||3 microfiches : negative. --|
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Flotation deinking additive(s) combination with a polymeric material having a glass transition temperature in the range of from 20° C. to 70° C. for deinking wastepaper. This patent describes deinking as an agglomeration of ink particles into ink globules from 2 to 5 millimeters or more in diameter which are subsequently removed by. Moreover, column flotation was also evaluated for its ability to clean recycled pulps for newsprint, fine paper, and board production, respectively. In all pulp streams, column flotation was very effective in removing ink and hydrophobic contaminants, while froth washing resulted in material losses in .
This three-part book includes Fundamentals of Deinking and Bleaching, Recent Developments and an Anthology Price: $ ISBN X Paper Recycling Challenge, Vol. III, Process Technology This comprehensive, information-packed book covers all stock preparation operations of paper recycling. First Flotation Column in a Paperboard. Use of surfactants having an HLB less than 10 in the deinking of dry toner electrostatic printed wastepaper: Richmann et al. /5: Apparatus and process for the separation of hydrophobic and hydrophilic particles using microbubble column flotation together with a process and apparatus for generation of microbubbles:
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The pulping consisted of disintegration of the wastepaper structure and dispersion of the fibers. The disintegration was accomplished by conditioning grams of wastepaper, under moderate agitation, with hot steam (84 to 90 °C), de-ionized water and reagent as desired.
After disintegration the pulp was further dispersed in a high speed blender. All pulping experiments were done at a. In the recent past, the use of column flotation as an effective technology for the deinking of wastepaper has been suggested.
Column flotation is a novel technology being introduced into the mineral processing industry since it offers significant cost and process advantages over conventional flotation by: protein-based surfactants) for use in ink removal from recycled paper via flotation deinking.
By applying green chemistry approaches we aim to minimize the environmental impact of deinking agents and also to open an avenue for a number of products that are to be generated from the utilization of biomass. Foamability and foam stability byFile Size: KB.
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 carried to the top of the flotation vessel and are Cited by: 5.
Deinking is a separation process to remove inks and other non-fibrous contaminants, which is necessary to recycle paper fibers.
In the past few years, based on a better understanding of deinking processes, wastepaper bio-refinery has been enhanced at laboratory and pilot plant : Csilla Farkas, Judit M.
Rezessy-Szabó, Vijai Kumar Gupta, Erika Bujna, Olivia Csernus, Vuong D. Nguy. A project to establish the relative merits of these two forms of column flotation (open and packed) in the deinking of recycled paper, as well as whether they outperform mechanical flotation.
Chaiarrekij et al. () investigated the applicability of a new flotation cell based on a column without an agitator present to accomplish the deinking of typical wastepaper feedstocks. The flotation column volume was 10 l, operated with pulp consistency of % at temperature of 40 °C.
Air flow rate was variable between 6 and 8 l min −1. 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.
Petri, B.M., " Deinking of Wastepaper in an Open and Packed Flotation Column ", Masters Thesis, University of Toronto, Toronto, ON (). Flotation Column Deinking of MOW Jan Flotation deinking is one of the steps in deinking, which usually consists of dislodging ink from the fibers during repulping, followed by ink separation from the suspension by flotation and washing.
A schematic of a flotation deinking cell is shown in Fig. It consists of a chamber in which the pulp suspension is introduced, together with air. A laboratory exercise for the flotation de-inking of wastepaper was described.
The exercise consists of disintegrating printed wastepaper in a blender and then removing the ink or toner. The deinking of wastepaper includes several operations. These include pulping, screening, centrifugal cleaning, washing, flotation, bleaching and kneading.
In the flotation process, air bubbles are passed through a low consistency pulp stock. A foaming agent is added to create foam on the surface of the pulp stock. Hydrophobic particles (hopefully.
Column Flotation Deinking: State-of-the-art and opportunities Article in Resources Conservation and Recycling 55(12) October with 56 Reads How we measure 'reads'. More than half of the wastepaper collected for recycling is printed; therefore, most of it requires deinking.
The deinking process is classified into two main categories: (1) chemical deinking and (2) ultrasonic deinking. Both deinking processes, in turn, are subdivided into two systems: (a) deinking by washing and (b) deinking by flotation.
study to increase flotation deinking selectivity and collection kinetics using packed columns. In this study, we present an innovative concept and technology for flotation of toner-printed papers.
chemical deinking with double stage flotation with the usage of non ionic surfactant. The efficiency of the process has been increased by double stage flotation. Freedonia Group () studied the different chemicals used in paper manufacturing. This paper stresses on fillers, binders, coating pigments, bleaching and deinking.
A flotation process for the de-inking of printed waste-paper by treating the paper pulp in the pulper at alkaline pH-values by means of alkali silicate, oxidative bleaches and separating the loosened printing-ink particles from the fibrous material suspension by flotation, in which protein fatty acid condensates are added finely distributed, possibly together with dispersing agents, in a.
Flotation Deinking The most widely used deinking technology is flotation deinking. During this process ink is removed from the pulp by re-soaking it in a vat of water and applying certain chemicals called surfactants.
Air is then introduced into the recovered pulp, and ink particles (along with other chemicals) will float and mix with the foam. of column flotation technology as a mean to decontaminate the paper machine whitewater circuits.
Column Flotation Flotation deinking is a key unit operation in most paper recycling plants for the removal of hydrophobic contaminants from pulp .
There is a wide variety of flotation cells available for deinking but the dominant. Specialty Grades (as per US Scrap Specification Circular ) The grades listed below are produced and traded in carload and truckload quantities throughout the United States, and because of certain characteristics (i.e., the presence of wet strength, polycoatings, plastic, foil, carbon paper, hot melt glue), are not included in the regular grades of paper stock.
studied. Deinking results are compared to INGEDE 11p procedure, using oleic acid. It is discovered that fatty acids “C” and “B” have better deinking performance than oleic acid. Lower acid number acids perform better.
Acid “C” and bentonite clay is used in one loop - flotation deinking .Deinking (say dee-in-kin): This involves ‘washing’ the pulp with chemicals to remove printing ink and glue residue. Sometimes, a process called floatation is applied to further remove stubborn stains and stickies.
Floatation involves the use of chemicals and air to create bubbles which absorb the stickies in the pulp.Purchase Recycling and Deinking of Recovered Paper - 1st Edition. Print Book & E-Book. ISBN