CA2101225A1 - Wastepaper treatment method - Google Patents
Wastepaper treatment methodInfo
- Publication number
- CA2101225A1 CA2101225A1 CA 2101225 CA2101225A CA2101225A1 CA 2101225 A1 CA2101225 A1 CA 2101225A1 CA 2101225 CA2101225 CA 2101225 CA 2101225 A CA2101225 A CA 2101225A CA 2101225 A1 CA2101225 A1 CA 2101225A1
- Authority
- CA
- Canada
- Prior art keywords
- flotation
- hydrocyclone
- fraction
- core
- cells
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
- D21B1/325—Defibrating by other means of waste paper de-inking devices
- D21B1/327—Defibrating by other means of waste paper de-inking devices using flotation devices
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
- D21F1/70—Pulp catching, de-watering, or recovering; Re-use of pulp-water by flotation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Materials For Medical Uses (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Steroid Compounds (AREA)
- Cyclones (AREA)
- Treating Waste Gases (AREA)
- Enzymes And Modification Thereof (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The invention is directed to a method and apparatus for treating wastepaper, wherein a selective flotation of suspension in a selective flotation system is carried out in multiple calls.
Flotation froth is fed to hydrocyclone which produces two fractions, with a core fraction including lightweight particles and gas being drawn from the core and discarded, preferably at the upper end, and with a heavy fraction recycled to the selective flotation system.
The invention is directed to a method and apparatus for treating wastepaper, wherein a selective flotation of suspension in a selective flotation system is carried out in multiple calls.
Flotation froth is fed to hydrocyclone which produces two fractions, with a core fraction including lightweight particles and gas being drawn from the core and discarded, preferably at the upper end, and with a heavy fraction recycled to the selective flotation system.
Description
- 21~12~
E~an~--Di~t~r DorPl l~g~r S~erh~r~l Veh 'rhe preuaent inv~nt~ on ~o~ a m~hod A~ld 2Ipparatu~ ~or ~a~tepaper l:~e~ent.
I~h~ pr~bl~r~ underly~ g th~3 pr~3snt in~nt:Lon 1-~ to provid~a a ~y~t~m R* ~mpl~ d~lgn an~l having rala~lvely low ~7ast6l ac:or~al.
It 1~ ~own in th~ ~rt tc? r~3mo~lre ~roth ~m ~el~ot~ve ~lots~ion ~y6~e3n. ~rh6l frot:h i nc:lud~e 6~a~e~, d~ rt palrticleF: asld ~ibe!r~ . A ~3scondary ~lota~i :?n oy~t~m m~y bla aor~ne{:t~d tn ~ pximary ~lota~ ys~ or ror~3ving the ~ib~r~3 ~ro~ ~he:
~rot~
Wh~t 18 n~de~d in th~ art 1~ a ~33thod ~nd ~p~ratu~ :tor trnatln~ W~st~pAp~r whl~h ~oe~ not utiliz~ a sosondars~ ~lotation ~yst~
In on~ or~ tnar~o~ 5 I;h~l pr~nt lnv~ntion compr~eo~ a me~hod ~ p~aratu~ ~or tr~ ng ~2ls~ep~psrt wh~r~ln a ~elçct~ve :~lot~tion o~
E~u~p~ lon ln a e~lective :elo~tion ~;y~st2m ~
carried~ ou~: ln ~ultip~o cell~ . Flo~atio2~ ~roth 1;
~d to a hy~ro~yelt)ne whl~h pro~uc-3~ twc~
i~rac~ion6;, w~ kh a c:ore frElctl~n in~::luding 1~ ght~igh~ pa~tic~le~ arld g~ b~ing drawn ~xorn ~h~
aore~ . n~l t~i~cs~rde~ pr~r~bly at th~ Upper ~nd, ~n~l With a h~vy i~raction re~ycled ~o thla 8el~4ti~e Plo~at~ on ~y~t2m.
Ar~ ~dv~n~as~e o~ the pre~ent invont$on l~ l:hat th~ 0n~1ar~ ~lolc~t~n 13y~tem 1~ ~limi~ate~d, therQby pro~riding ~a~ 3r c~ trol and operatiorl o~
th~ o~t~r~ll sy~tem .
.
.: ' . . .
. . : , :
. . ~ : -. :
:' , , ' ' ' .... . :' . . : . ' ~ ' ' ' .. . . .. .
21~22~
~h~ v~-~ntior~d and othor ~t~
~nd e.d~r~ntage6 o~ t~is $nv~ntion, ~nd ~h~ ~anner ~ att~lning~ thesll, w~ll beco~e ~ors~ appa~nt ænd t~o ln~tsntlon wlll ~a bet~:c und~r~'coocl }~y r~r~nca to th~ ~ollowlng d~ ription 4~ an ~odim~n~ o~ in~r~nt~ on t~X~n in oorlj~nct~on with tl~ ompa~l:ying d~win~, ~dhs~ra~n:
Flg. 1 i~3 a ~ Aatic illu~ation o~ an ~sodlall~nt Or ~ r~n~ ~n~n~ioa~.
Corr~ponding ~ r~nc~ ch~racts~s in~lic~at~
corr~ponding pZl~ oughout tha ~svsral vlew~.
. . q~ ~xs~pllSlcat~on ~at out: h~ in llluE~træltQ~ ona e~d ~odlm~nt o~ th~ vention, in one ~o~ d s~ æx~pll~lcatlon 1~ not to b~
con~ d a~ tirlg th~ ~COp@ of ~he inv~ntlon in ~ny mann~
01ecti~e i~lo~;~l;ioA ~ t~ 1 ( i o J~ ma~y ~0 ~lo~tion ~y~tem) inGlud~ inaivldu~ rially ~ang~d flo~a'clon ~all~ 10 rrom wni~ o~h ls~
r~mov~d ~n~o a Goll~ tion c:h~lt~ I ~hieh is d.l~rlde~
~nto ~ at p~ 12 ar~d a ~ ond pArl 121. ~h4 ~ot~ o~ l~ir~ pa~t 12 s:~ khs ~:oL~tion. OhUt~, ~5 a~d P~ rab~Y On1Y 0~ th~ g~r~t ~lot7.ti~n C~ll 10, i~ di8~a~d~a. ~ ~m~nin9~ ~rO~ B1 ~:ha~ COn~ Part 12' 0~ 1Q~1Q
~2aUt~ d V1a PU~P ~0 ~0 ~ hY~OCY~1On~ 3 ha~ a~ it~ top a~ ~ u~t 4 wit;h ~ d~ç~2l~slrlg ~i~ad 7~ ~o~ ~ dsl~c~ lahl~3 ~a~q~ous ~o~o frao~ n, e.n~ at 1:h8 ~o~:~a~ a dxain pi~ o~ a h~avy c1:ion Go~a~niDg r~la~ ely i~we~ dlrl:
nd, thu~, i8 p~rl ~i~ad l~y th~ ee~2ara~:Lorl pxoca~3., 'rh~s 9a8Roug 60XQ ~r~Ction a~.so ::on~aln~e a c~rtain ~ounl: o~ $. ~ r~inder o~ th~
ar~ drain thsoug~ dr~ln plp- 5, alon~ ~th .- . -A . . , , ~ , ' . ~
. ' ,' "., ~, . , " ", , " ' ' ,.' ' ~ . ~, .
. ' , ,,,: ' ' . , ,' ' :
' ' . ' ' '. ', '', ' ' . ' ~ ' :
E~an~--Di~t~r DorPl l~g~r S~erh~r~l Veh 'rhe preuaent inv~nt~ on ~o~ a m~hod A~ld 2Ipparatu~ ~or ~a~tepaper l:~e~ent.
I~h~ pr~bl~r~ underly~ g th~3 pr~3snt in~nt:Lon 1-~ to provid~a a ~y~t~m R* ~mpl~ d~lgn an~l having rala~lvely low ~7ast6l ac:or~al.
It 1~ ~own in th~ ~rt tc? r~3mo~lre ~roth ~m ~el~ot~ve ~lots~ion ~y6~e3n. ~rh6l frot:h i nc:lud~e 6~a~e~, d~ rt palrticleF: asld ~ibe!r~ . A ~3scondary ~lota~i :?n oy~t~m m~y bla aor~ne{:t~d tn ~ pximary ~lota~ ys~ or ror~3ving the ~ib~r~3 ~ro~ ~he:
~rot~
Wh~t 18 n~de~d in th~ art 1~ a ~33thod ~nd ~p~ratu~ :tor trnatln~ W~st~pAp~r whl~h ~oe~ not utiliz~ a sosondars~ ~lotation ~yst~
In on~ or~ tnar~o~ 5 I;h~l pr~nt lnv~ntion compr~eo~ a me~hod ~ p~aratu~ ~or tr~ ng ~2ls~ep~psrt wh~r~ln a ~elçct~ve :~lot~tion o~
E~u~p~ lon ln a e~lective :elo~tion ~;y~st2m ~
carried~ ou~: ln ~ultip~o cell~ . Flo~atio2~ ~roth 1;
~d to a hy~ro~yelt)ne whl~h pro~uc-3~ twc~
i~rac~ion6;, w~ kh a c:ore frElctl~n in~::luding 1~ ght~igh~ pa~tic~le~ arld g~ b~ing drawn ~xorn ~h~
aore~ . n~l t~i~cs~rde~ pr~r~bly at th~ Upper ~nd, ~n~l With a h~vy i~raction re~ycled ~o thla 8el~4ti~e Plo~at~ on ~y~t2m.
Ar~ ~dv~n~as~e o~ the pre~ent invont$on l~ l:hat th~ 0n~1ar~ ~lolc~t~n 13y~tem 1~ ~limi~ate~d, therQby pro~riding ~a~ 3r c~ trol and operatiorl o~
th~ o~t~r~ll sy~tem .
.
.: ' . . .
. . : , :
. . ~ : -. :
:' , , ' ' ' .... . :' . . : . ' ~ ' ' ' .. . . .. .
21~22~
~h~ v~-~ntior~d and othor ~t~
~nd e.d~r~ntage6 o~ t~is $nv~ntion, ~nd ~h~ ~anner ~ att~lning~ thesll, w~ll beco~e ~ors~ appa~nt ænd t~o ln~tsntlon wlll ~a bet~:c und~r~'coocl }~y r~r~nca to th~ ~ollowlng d~ ription 4~ an ~odim~n~ o~ in~r~nt~ on t~X~n in oorlj~nct~on with tl~ ompa~l:ying d~win~, ~dhs~ra~n:
Flg. 1 i~3 a ~ Aatic illu~ation o~ an ~sodlall~nt Or ~ r~n~ ~n~n~ioa~.
Corr~ponding ~ r~nc~ ch~racts~s in~lic~at~
corr~ponding pZl~ oughout tha ~svsral vlew~.
. . q~ ~xs~pllSlcat~on ~at out: h~ in llluE~træltQ~ ona e~d ~odlm~nt o~ th~ vention, in one ~o~ d s~ æx~pll~lcatlon 1~ not to b~
con~ d a~ tirlg th~ ~COp@ of ~he inv~ntlon in ~ny mann~
01ecti~e i~lo~;~l;ioA ~ t~ 1 ( i o J~ ma~y ~0 ~lo~tion ~y~tem) inGlud~ inaivldu~ rially ~ang~d flo~a'clon ~all~ 10 rrom wni~ o~h ls~
r~mov~d ~n~o a Goll~ tion c:h~lt~ I ~hieh is d.l~rlde~
~nto ~ at p~ 12 ar~d a ~ ond pArl 121. ~h4 ~ot~ o~ l~ir~ pa~t 12 s:~ khs ~:oL~tion. OhUt~, ~5 a~d P~ rab~Y On1Y 0~ th~ g~r~t ~lot7.ti~n C~ll 10, i~ di8~a~d~a. ~ ~m~nin9~ ~rO~ B1 ~:ha~ COn~ Part 12' 0~ 1Q~1Q
~2aUt~ d V1a PU~P ~0 ~0 ~ hY~OCY~1On~ 3 ha~ a~ it~ top a~ ~ u~t 4 wit;h ~ d~ç~2l~slrlg ~i~ad 7~ ~o~ ~ dsl~c~ lahl~3 ~a~q~ous ~o~o frao~ n, e.n~ at 1:h8 ~o~:~a~ a dxain pi~ o~ a h~avy c1:ion Go~a~niDg r~la~ ely i~we~ dlrl:
nd, thu~, i8 p~rl ~i~ad l~y th~ ee~2ara~:Lorl pxoca~3., 'rh~s 9a8Roug 60XQ ~r~Ction a~.so ::on~aln~e a c~rtain ~ounl: o~ $. ~ r~inder o~ th~
ar~ drain thsoug~ dr~ln plp- 5, alon~ ~th .- . -A . . , , ~ , ' . ~
. ' ,' "., ~, . , " ", , " ' ' ,.' ' ~ . ~, .
. ' , ,,,: ' ' . , ,' ' :
' ' . ' ' '. ', '', ' ' . ' ~ ' :
2~01?,2~
~eï~tlvely s~n~ll amoun~ o~ dir~ p~r~icl~, anà ~re r~cyc~ to the t~on~ og ~21~ctiv~ ~lotation ~y~t~ 1 , i . e ., to 4 rst ~lota~lo~ a411 ~0 oP
~lr~ p~rl: la. ~ydrocyclon~a 3 pr~or~bly ha~
S con~2a~ tap~ ard ~h~ d~ain ~o~ n~aYior ~ra~ion.
~h~ pre~nt ~nYar tlo~ ~o~ n~ inc:lude a ~c:~n~ry ~lota~on ~ys~m wh~ conn~ o a~y ~lo~at~on ~y~ m 1.
0 ~ al50 pO~;oi~lo to ~4p~rate ri}~ro ~om ~a ~elu1 d ~u pen~lon o~ ths ~ and/or s~cond flo~tlon 6all lG ~o:~, oxlly ~l~st c~ thQ
seleon~ hydrocyc:lo~. 3 rq!C~ Y08 thç~ ~ro~ sa~ all r~ai~ing c~ by a i3~con~1 hy~ro~yclon~ 3~ oi~ a lS ~r~c:or~d hyarocyGloI~ sy~t~a 4 ~ (With s~e re~ nc~ a~ oth~r hydro~y~lorle 6y~ m, ~u~
ea~:h ~ vld~d wlt~ el prl~ ysalaol ) ~ Tha co~a ~aeq~ s~ hydrocyclon~ 3', po~ 3ly ~
~a~ou~ pr~rably a~lso d~ ca~:d~d (r~ er to ao ~h-do~ t~atton ln 1:he ~lgu~
Roc:y::lin5~ o~ r~s~n~ lnvE3ntic~n ~rsvid2~ a g~t~ loa~ llpon ~ ~3t ~ew ~l~t~ti~rl c:ells 10, bu~ o pr~vid~ ~ hlgha~ d~gr~30 o~ ~p~ra-~ion o~ ~u~bn~lon pa~tl61~s in ~ o~h.
Sub~ o~ 10 a~s n~ c~ ~o a ar.ti~ly ~i~h~r load~ ~o~ h~ nuD~er o~
C~211~11 10 ~l~o ~ b~ ar~a~d by 1 ~ he-p~ vonlt~ P~ d~ n~a~ pl~x n an~ 60n~o~, ~ec~ua~ a 6~0~
3Q fl~t~ o~ ~;y~t~ ~no~ ~ho~n~, ~whl~ if3 ~:ot~n~on~lly u~qld, ~ ~ ~llml~t~d v Dr~n ~ in9 ~5 ot~ hydrocy~lon~ 3 ~m~ e~ the hoavy ~aation ir~to a ~oll~tion ~to~38~1 17, ~Ild 1 tr~ns~ort~d ~f~a ~mp ~g lto 2ll~xing eha~2~ ~a o~
~a~y ~lot~ion ~y~c~ 1.
.
2~2~
~h~ le thi8 lnvMntion ha~ b~en do~crl~ed ~
h~in~ a pr~err~d desi~, th~ ~res~nt ~nv~tLon c~n bo ~ r modi~l~d w~thln ~h~ ~p~rl~ and t~C:2pe oi~ ~liO ~l~closur~ ~hi~ application L~
S ~he~e~o~e lnl:~n~ to eov~r ~ny v~ri~t1on~ a, o~ adap~a~io~s ot tA~ ~m~n~ion u~1ng it~ gQn~:al H1~ B 2p~ a~n i8 iRt:enc~le)d to COV6~ suclh d~apa~urcl% ~ro~ ~a p~ 3nt:
di~isclos~ s; co~n~ wlt:~in known or ~u~omary SO pxac~:~c~a i~ ~a zlrt to wh1ch th1~ ~:nv~ntlon p~ wh~ ll wi1;h1n th6a lim; t~
~p~nd~d ¢l~o ~.
- - .
.
: . -, , -.
, ~'. , , . ~ ' .
... ; ~ ' ' ~- ' ' '' :
- . , , ~ -.
~eï~tlvely s~n~ll amoun~ o~ dir~ p~r~icl~, anà ~re r~cyc~ to the t~on~ og ~21~ctiv~ ~lotation ~y~t~ 1 , i . e ., to 4 rst ~lota~lo~ a411 ~0 oP
~lr~ p~rl: la. ~ydrocyclon~a 3 pr~or~bly ha~
S con~2a~ tap~ ard ~h~ d~ain ~o~ n~aYior ~ra~ion.
~h~ pre~nt ~nYar tlo~ ~o~ n~ inc:lude a ~c:~n~ry ~lota~on ~ys~m wh~ conn~ o a~y ~lo~at~on ~y~ m 1.
0 ~ al50 pO~;oi~lo to ~4p~rate ri}~ro ~om ~a ~elu1 d ~u pen~lon o~ ths ~ and/or s~cond flo~tlon 6all lG ~o:~, oxlly ~l~st c~ thQ
seleon~ hydrocyc:lo~. 3 rq!C~ Y08 thç~ ~ro~ sa~ all r~ai~ing c~ by a i3~con~1 hy~ro~yclon~ 3~ oi~ a lS ~r~c:or~d hyarocyGloI~ sy~t~a 4 ~ (With s~e re~ nc~ a~ oth~r hydro~y~lorle 6y~ m, ~u~
ea~:h ~ vld~d wlt~ el prl~ ysalaol ) ~ Tha co~a ~aeq~ s~ hydrocyclon~ 3', po~ 3ly ~
~a~ou~ pr~rably a~lso d~ ca~:d~d (r~ er to ao ~h-do~ t~atton ln 1:he ~lgu~
Roc:y::lin5~ o~ r~s~n~ lnvE3ntic~n ~rsvid2~ a g~t~ loa~ llpon ~ ~3t ~ew ~l~t~ti~rl c:ells 10, bu~ o pr~vid~ ~ hlgha~ d~gr~30 o~ ~p~ra-~ion o~ ~u~bn~lon pa~tl61~s in ~ o~h.
Sub~ o~ 10 a~s n~ c~ ~o a ar.ti~ly ~i~h~r load~ ~o~ h~ nuD~er o~
C~211~11 10 ~l~o ~ b~ ar~a~d by 1 ~ he-p~ vonlt~ P~ d~ n~a~ pl~x n an~ 60n~o~, ~ec~ua~ a 6~0~
3Q fl~t~ o~ ~;y~t~ ~no~ ~ho~n~, ~whl~ if3 ~:ot~n~on~lly u~qld, ~ ~ ~llml~t~d v Dr~n ~ in9 ~5 ot~ hydrocy~lon~ 3 ~m~ e~ the hoavy ~aation ir~to a ~oll~tion ~to~38~1 17, ~Ild 1 tr~ns~ort~d ~f~a ~mp ~g lto 2ll~xing eha~2~ ~a o~
~a~y ~lot~ion ~y~c~ 1.
.
2~2~
~h~ le thi8 lnvMntion ha~ b~en do~crl~ed ~
h~in~ a pr~err~d desi~, th~ ~res~nt ~nv~tLon c~n bo ~ r modi~l~d w~thln ~h~ ~p~rl~ and t~C:2pe oi~ ~liO ~l~closur~ ~hi~ application L~
S ~he~e~o~e lnl:~n~ to eov~r ~ny v~ri~t1on~ a, o~ adap~a~io~s ot tA~ ~m~n~ion u~1ng it~ gQn~:al H1~ B 2p~ a~n i8 iRt:enc~le)d to COV6~ suclh d~apa~urcl% ~ro~ ~a p~ 3nt:
di~isclos~ s; co~n~ wlt:~in known or ~u~omary SO pxac~:~c~a i~ ~a zlrt to wh1ch th1~ ~:nv~ntlon p~ wh~ ll wi1;h1n th6a lim; t~
~p~nd~d ¢l~o ~.
- - .
.
: . -, , -.
, ~'. , , . ~ ' .
... ; ~ ' ' ~- ' ' '' :
- . , , ~ -.
Claims (7)
1. A method of treating wastepaper, comprising the steps of:
providing a selective flotation system having a plurality of flotation cells;
removing flotation froth from at least one of a first and second flotation cell of said plurality of flotation cells;
separating or purifying flotation froth from the remainder of said plurality of flotation cells with a hydrocyclone, said hydrocyclone providing a core fraction and a heavy fraction, said core fraction comprising lightweight particles and gas, said heavy fraction comprising relatively fewer contaminants than said core fraction;
drawing said core fraction from an upper end of said hydrocyclone; and recycling said heavy fraction from a bottom end of said hydrocyclone to said first flotation cell of said selective flotation system.
providing a selective flotation system having a plurality of flotation cells;
removing flotation froth from at least one of a first and second flotation cell of said plurality of flotation cells;
separating or purifying flotation froth from the remainder of said plurality of flotation cells with a hydrocyclone, said hydrocyclone providing a core fraction and a heavy fraction, said core fraction comprising lightweight particles and gas, said heavy fraction comprising relatively fewer contaminants than said core fraction;
drawing said core fraction from an upper end of said hydrocyclone; and recycling said heavy fraction from a bottom end of said hydrocyclone to said first flotation cell of said selective flotation system.
2. The method of Claim 1, wherein said removing step comprises discarding said flotation froth removed from said first and second flotation cells.
3. The method of Claim 1, comprising the further step of separating or purifying said flotation froth removed from said first and second flotation cells with a second hydrocyclone, said second hydrocyclone providing a core fraction and a heavy fraction, said core fraction comprising lightweight particles and gas, said heavy fraction comprising relatively heavier particles and fewer contaminants than said core fraction;
drawing said core fraction from an upper end of said second hydrocyclone; and recycling said heavy fraction from a bottom end of said second hydrocyclone to said first flotation cell of said selective flotation system.
drawing said core fraction from an upper end of said second hydrocyclone; and recycling said heavy fraction from a bottom end of said second hydrocyclone to said first flotation cell of said selective flotation system.
4. The method of Claim 1, wherein said recycling step comprises recycling said heavy fraction from a bottom end of said hydrocyclones to said first flotation cell of said selective flotation system, via a mixing chamber.
5. An apparatus for treating wastepaper, comprising:
a primary flotation system having a plurality of flotation cells;
means for removing flotation froth from at least one of a first and second flotation cell of said plurality of flotation cells;
a hydrocyclone connected to a remainder of said plurality of flotation cells for separating or purifying flotation froth from said remainder of said flotation cells, said hydrocyclone providing a core fraction and a heavy fraction, said core fraction comprising lightweight particles and gas, said heavy fraction comprising relatively fewer contaminants than said core fraction, said hydrocyclone including a drain pipe connected to said first flotation cell for recycling said heavy fraction to said primary flotation system.
a primary flotation system having a plurality of flotation cells;
means for removing flotation froth from at least one of a first and second flotation cell of said plurality of flotation cells;
a hydrocyclone connected to a remainder of said plurality of flotation cells for separating or purifying flotation froth from said remainder of said flotation cells, said hydrocyclone providing a core fraction and a heavy fraction, said core fraction comprising lightweight particles and gas, said heavy fraction comprising relatively fewer contaminants than said core fraction, said hydrocyclone including a drain pipe connected to said first flotation cell for recycling said heavy fraction to said primary flotation system.
6. The apparatus of Claim 5, wherein said drain pipe is connected to said first flotation cell via a collection vessel and a mixing chamber.
7. The apparatus of Claim 5, further comprising a second hydrocyclone for separating or purifying said flotation froth removed from said first and second flotation cells, said second hydrocyclone providing a core fraction and a heavy
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4224329.7 | 1992-07-23 | ||
| DE19924224329 DE4224329C1 (en) | 1992-07-23 | 1992-07-23 | Processing methods for waste paper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2101225A1 true CA2101225A1 (en) | 1994-01-24 |
Family
ID=6463922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2101225 Abandoned CA2101225A1 (en) | 1992-07-23 | 1993-07-23 | Wastepaper treatment method |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP0580087B1 (en) |
| JP (1) | JPH06166975A (en) |
| KR (1) | KR940005854A (en) |
| AT (1) | ATE138430T1 (en) |
| BR (1) | BR9302517A (en) |
| CA (1) | CA2101225A1 (en) |
| DE (1) | DE4224329C1 (en) |
| ES (1) | ES2089648T3 (en) |
| FI (1) | FI933299A (en) |
| NO (1) | NO302041B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7267231B2 (en) * | 2003-02-25 | 2007-09-11 | Andritz Ag | Process and device for aerating suspensions |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19611864C1 (en) * | 1996-03-26 | 1997-12-11 | Voith Sulzer Stoffaufbereitung | Flotation process and device for separating solids from a suspension containing paper fibers |
| DE19728393C2 (en) * | 1997-07-03 | 1999-08-05 | Voith Sulzer Stoffaufbereitung | Process and plant for removing contaminants from an aqueous fiber suspension |
| DE19920480A1 (en) * | 1999-05-04 | 2000-11-09 | Voith Sulzer Papiertech Patent | Process for removing impurities from an aqueous paper fiber suspension |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3005815C2 (en) * | 1980-02-16 | 1982-09-23 | J.M. Voith Gmbh, 7920 Heidenheim | Device for deinking waste paper |
| JPH0660473B2 (en) * | 1985-04-18 | 1994-08-10 | 新王子製紙株式会社 | Waste paper deinking method |
| ATE151131T1 (en) * | 1992-03-04 | 1997-04-15 | Voith Gmbh J M | PROCESSING AND PROCESS OF WASTE PAPER |
-
1992
- 1992-07-23 DE DE19924224329 patent/DE4224329C1/en not_active Expired - Fee Related
-
1993
- 1993-07-16 AT AT93111428T patent/ATE138430T1/en not_active IP Right Cessation
- 1993-07-16 ES ES93111428T patent/ES2089648T3/en not_active Expired - Lifetime
- 1993-07-16 EP EP19930111428 patent/EP0580087B1/en not_active Expired - Lifetime
- 1993-07-20 KR KR1019930013646A patent/KR940005854A/en not_active Application Discontinuation
- 1993-07-22 NO NO932651A patent/NO302041B1/en not_active IP Right Cessation
- 1993-07-22 BR BR9302517A patent/BR9302517A/en not_active IP Right Cessation
- 1993-07-22 FI FI933299A patent/FI933299A/en unknown
- 1993-07-23 JP JP20265493A patent/JPH06166975A/en active Pending
- 1993-07-23 CA CA 2101225 patent/CA2101225A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7267231B2 (en) * | 2003-02-25 | 2007-09-11 | Andritz Ag | Process and device for aerating suspensions |
Also Published As
| Publication number | Publication date |
|---|---|
| FI933299A (en) | 1994-01-24 |
| JPH06166975A (en) | 1994-06-14 |
| NO302041B1 (en) | 1998-01-12 |
| EP0580087B1 (en) | 1996-05-22 |
| ES2089648T3 (en) | 1996-10-01 |
| FI933299A0 (en) | 1993-07-22 |
| ATE138430T1 (en) | 1996-06-15 |
| KR940005854A (en) | 1994-03-22 |
| BR9302517A (en) | 1994-02-01 |
| NO932651D0 (en) | 1993-07-22 |
| DE4224329C1 (en) | 1993-11-11 |
| NO932651L (en) | 1994-01-24 |
| EP0580087A1 (en) | 1994-01-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |