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Sale/Auction: Shinhama Model HI-Flo 20 Flotation Cells - SOLD!

Send an email to sales@papermillsurplus.com to inquire about this item.

Make/Model:

 Shinhama HI Flo-20

Description:

- (4) Shinhama Model HIF20.
- Shinhama Model HIF16.

 Process Improvement - Minimized Flotation
After the first stage of ozone bleaching, stock is brought down to a consistency of one percent prior to its
introduction into the flotation system. We have two parallel lines of three cells with a single secondary flotation cell
in NH and a single line and secondary in WA.
While the overall deinking system was designed to effectively remove particles of up to 150 microns with the new
washer design and particles over that size with the .004 inch slotted pressure screens, it was still found advantageous
for printing and writing quality specifications to have flotation to remove ink in the size range of fifty to two hundred
and fifty microns.
Flotation also has a low removal efficiency (PO observed this efficiency in the range of thirty to forty
percent) for stickies and micro stickies. The design utilized is less dependent on flotation and flotation chemistry for
both ink and stickies removal when compared to most other deink plant designs.
Many other deink plant designs have flotation prior to kneading (or dispersion), after kneading (or dispersion) and/or
flotation systems after a secondary kneading stage. Considerable capital dollars are tied up in flotation equipment for
ink removal with poor results for overall stickies removal.
Shinhama Flotation Cells are utilized in NH and WA. After flotation the stock is then sent to the second
stage of washers prior to a Krima Dispersing System. These flotation cells actually function much like a very large
reverse cleaner with air injection.
It is our opinion the pulp quality required for tissue and toweling applications today can be achieved from mixed
office waste without flotation in the system if small compromises on small dirt levels between printing and writing
and tissue quality are made. We also believe that in the future flotation may become unnecessary for printing and
writing quality with further improvements in washing and fiber recovery.
The washing stage after the flotation system is also an aggressive stage but to help yield the aggressiveness of that
washing stage can be decreased to achieve higher yields through the choice of which nozzles are used, nozzle
pressure and the mesh of the fabric installed at that stage.

A flotation ceU is essentially comprised of three major zones: aeration, mixing
and separation. The amount of air and bubble size distribution is adjusted within the
aeration zone. In the mixing stage, microturbulance is created to increase collision
fiequency between air bubbles and ink particles. Air bubbles nse to fom a fioth in the
separation zone which is subsequently removed £tom the cell. Due to the increasing
importance of flotation deinking, ce11 manufachirers continually update the design of their
cells to reduce energy, Save space, irnprove deinking efficiency and reduce the loss of
valuable fibres.
The ink removal efficiency has been show to improve if a combination of
dissolved and dispersed air is used [32]. Flotation is usually operated using a number of
cells comected in senes through which the suspension passes in a steady flow [16]. In
addition, there are typically two stages to the fiotation process. The primary stage is used
for deinking, while in die secondary stage the fibres fiom the fioth of the primary stage
are retrieved.
Numerous reviews of modem flotation deinking ce11 technology exist in the
literature detailing their principles of operation, configuration and performance
[11,16,18,33-351.
The major developments in flotation deinking ce11 technology have occurred since
the end of the 1970's. This evolution is well documented in the literature [Il].
Flotation deinking cells are currently being manufactured and distributed
worldwide by the following nine companies: Beloit, Corner, Karnyr, Kvaemer Hymac,
Lamort Fiberprep, Shinarna, Themo Black Clawson, Voith Sulzer, and Wemco.
Table 1 summarizes the primary features of some of the mainstrearn flotation
cells. Please note that since the production of Table 1, Black Clawson has corne to be
known as Thermo Black Clawson; and Voith and Escher Wyss have merged to become
known as Voith Sulzer.

 Shin hama Hi-Flo
Another flotation ce11 in use is the Shinama Hi-Flo flotation ce11 [37]. This
Iapanese cell is a hydrocyclone similar to the Kamyr GSC, however, the Hi-Flo is larger
and does not have a porous media. A Hi-Flo unit is shown in Figure 10.

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