CA1115663A - Tandem transversely vibrated inclined bed liquid treated stratifiers - Google Patents
Tandem transversely vibrated inclined bed liquid treated stratifiersInfo
- Publication number
- CA1115663A CA1115663A CA299,669A CA299669A CA1115663A CA 1115663 A CA1115663 A CA 1115663A CA 299669 A CA299669 A CA 299669A CA 1115663 A CA1115663 A CA 1115663A
- Authority
- CA
- Canada
- Prior art keywords
- motion
- particles
- slope
- amplitude
- decks
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/02—Washing granular, powdered or lumpy materials; Wet separating using shaken, pulsated or stirred beds as the principal means of separation
- B03B5/26—Washing granular, powdered or lumpy materials; Wet separating using shaken, pulsated or stirred beds as the principal means of separation in sluices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/02—Washing granular, powdered or lumpy materials; Wet separating using shaken, pulsated or stirred beds as the principal means of separation
- B03B5/04—Washing granular, powdered or lumpy materials; Wet separating using shaken, pulsated or stirred beds as the principal means of separation on shaking tables
Landscapes
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A Tandem separating device is provided which has two sloping decks each which receives a sand suspension for separation and both of which are continuously smoothly reciprocated horizontally, transversely to the slope direction. A cyclic operation is provided whereby a sand suspension is fed in turn to each deck, it is separated by the reciprocation and is flushed off to bins thereby collecting separate time-intervals of operation. In this manner most metalliferous particles are collected in a different bin from most of the sand and one is able to effect the separation from for example sand tailings from mineral dressing.
A Tandem separating device is provided which has two sloping decks each which receives a sand suspension for separation and both of which are continuously smoothly reciprocated horizontally, transversely to the slope direction. A cyclic operation is provided whereby a sand suspension is fed in turn to each deck, it is separated by the reciprocation and is flushed off to bins thereby collecting separate time-intervals of operation. In this manner most metalliferous particles are collected in a different bin from most of the sand and one is able to effect the separation from for example sand tailings from mineral dressing.
Description
Thi9 invention relates to a separator for separating particles of different tensities, by treatment o~ suope~s;ons of the particles in a liquid, ant concerns separation of suspensiono containing material di~tributed over a ran8e of density and/or particle sizeq The invention ls especially concerned with the treatment of suspended material of very small particle size such as for example sand tailings from mineral dressing equipmRnt which in current practice are normally discharged to waste even though they contain valuable metallierous componentsO For exampleg sand tailings from a typical 10 mill might range from 20 Briti~h Standard mesh to 400 mesh with small proportions even finerO
In our UoKo Patent Specif;cat;on NoO 1,174~405to Mozley published Dec. 17/6Q there is described a gravity separator which was developed primarily to handle tin bearing slimes to recover residual tin which at that time could not be recovered with existing equipment of conventional type.
Apparatus in accordance with U.K. Patent Specificatlon No.
1,1749405 has been available and extensively used for same years and has given excellent performance ena~ling very considerable oavingo to be mate in the tin min;ng and other industriesO The principle of operation of the apparatus of U~Ko Patent Specification ~l~S6~3 NoO 1~1749405 i8 that of adjustlng shear conditions in a flowing suspension by applying a shak;ng motion of variable amplitude and frequency in order to cause he~vier material to remain on a moving surfaceg and form a close packed deposit or bank, whilst the finer particles remain in suspension and advance along the surface~ The decks are freely suspended and are moved by a vibratory shaking action using an unbalanced~weight drive which~ although simple and reliable~ is such tha~ the path traced out by the decks with a given weight rotatlng at fixed radius will undesirably vary according to the total shaken weightO In cer~ain applications9 it has also become neces~ary to employ lower frequencies and then9 particularly when the frequency employed approaches the natural frequency of the app~ratus, control problems can ariseO Accord;ng to the invent;onD a separator for particles of d;ffering densities ha~ all the following features (a) to (e) 8 (a) Two sloplng surfaces each have a supply to the~r upper regiOns o particle~ to be separateda in the form of a flowing ~u~pension in a liquidO
(b) The two surfaces are mounted side by-s;de with their sloping directions parallel and are arranged to perform a repetitious illS6~3 non-discontinuous horizontal mo~ion generally orthogonal to their slopeO
(c) The lower ends of ~he surfaces drain mto separate collecting arrangementsO
(d) The motion is im~arted to the 6urfaces by a positive drive causing the mot;on to follow a path independent of the weight on the sur~aees 0 (e) The separator i~ arr~nged to follow a cycle of operations, with the mot;on applied to ~he surfaces throughout9 in a first phase of which one surface i~ receiving the guspension while the other surfaee receives a~ a eomparable ra~e the suspending liquid without particlesD followed by a ~hange in shear conditions on that other surface to flush off the partieles still remaining on it, the sècond phase being a reversal of roles of the surfaces~ the two phases alternating~ the collecting arrangement~ separating different time-intervals of particles draining into themO
ThusO in general terms~ the present invention provides a gravity separator designed to apply an o~cillatory motion in a transverse direction rela~ive to ~he progressive movement down a slcpe of a ZO flawing suspension 3nd capable of operating a~ high amplitudes, eOgO
lllS663 at least I cmO and pos~ibly a~ large as 20 cm or more~ and preferably from 4 to 18 cmD for example 5 to 15 cm~ or 6 to 12 cmO Thi8 apparatu~ comprlses ~wo sloping separa~;ng surfaces each receiving material to be treated~ hereinafter termed "decks"~ mounted side by side and arranged to perform a repetitious non~d;scontinuous horizontal motion eOgO linear~ orbital or other oscillatory motion~
preferably simple harmonic motion~ in a generally transverse direction relative to the slope of the deckO Jerky mo~io~ ~ust be avoidedO The decks are driven by a positi~e drive which c~uses the;r motion to follow a path ;ndependent of the we;ght of material deposlted on ~hem fr3m the suspension being treatedO The positive drive also avoids problems of loss of controL a~ lower frequenciesO
In the gravity separator according to the presen~ ;nvention the cycle of operations i~ 80 organised that at any one time one of the decks is functioning as a collect;ng ~urface on which banking of heavy deposits i8 tak;ng pla~e~ whilst on the o~her deck prev;ously banked material ;8 be;ng further separated and is then removed by al~eration of the ~hear conditions thereon to cause banked material to be resuspended in a stream of washing l;quidO Consequently~ the apparatus enrails means for adJusting the shear rondition~ on each of l~lS663 the decks preferably by alteration of 810pe and/or by adjustment of amplitude and/or by ad~usting frequency of oscillation; the last-named for example by interchangeable drive belts or a gearboxO
The simplest arrangement 18 one in which the two decks share a common subframe and thus are driven by a common drive means and shear contitions are altered by adjustment of slopeO However, because the two decks are operated for the most part in sequence, they may be arranged to be driven independently thus giving more flexibility in selecting running conditionsa eOgO amplitude and frequencyO To save floor ~paceS there may be ln place of each deck a stack of (for example 4 or 6) decks fixed on top of each other, each receiving its own supply of material to be treated~ but each discharging into a drain common to that stackO
The slope (when running as a collecting surface) is preferably 15 within the range l03 to 205, more preferably 105 to 202, most preferably I o6 to 2 0 The frequency of oscillation i5 preferably within the range of 008 ~o 3 ~Za more preferably 105 to 2 Hzo If the atep of flushing (removal of banked solids) entails altering the alopes the 810pe then may be 10 to 60a eOgO 30 to 45o The in~ention will now be descr;bed with reference to the :1115~63 accompanging drawings~ in which F;gure I is a plan vlew~ Figure 2 an elevation and F;gure 3 an end elevation of one embodlment of a separator according to the lnvention D
Figure 4 is an elevation of part of a second embodlment, F;gure 5 i8 a perspect;ve schematic view of a third embodiment~
and Figure 6 iB an end elevat;on of the embodiment of Figure 5, in its rest pos;tionO
Turning ~o Figures 1 ~ 3~ the separator comprises two plane decks A and B of wld~h 105m and of length 102m and with upturned ~ide edgesO The deeks A and B are mounted s;de by side on support ~ub-rames 1 su~pended by vert;cal support wires 2 from a support frsme 30 A s;ngle ~ubfrsme I common to both decks is also possibleO
1~ under certa~n operat;ng condlt;ons there appears a tendency for the wire~ 2 to spring or ~lacken cycl;cally~ causing the decks to bvunceD ~he wires can be augmented or replaced by floor-mounted pneuma~;c ~tiffening rocking atruts~ Horizontal longitudinsl restraining wires 4 also connect the sub-frames 1 to the support rame 3 80 that the sub~frames 1~ and hence the decks, cannot move in l~S663 the longitud;nal directionO The w;res 4 may be augmented or replaced by transverse rails welded to the subframes 1, the rails running between floor-mounted roller guides~ The deck~ A and B are mounted on pivots 5 a~d are adJustable in slope by means of tilt p;stons 60 The decks are driven by a common drive comprising pusher rods 7 driven by a cranked drive shaft 8 off a motor 90 At the top end of the sloping decks D shown on the right in Figure 3~ is mcunted a suspens;on feed dev;ce comprising a feed pipe lO supplying a two compartment feedbox 11 leading through flexible ducting 12 to the top end~ of the decks A and Bo At the boet~m end of the decks, receiv;ng material flowing off the bottom of each deckD is a drain ;n the form of a funnel 13 feed;ng through a spli~ter dev;ce 14 into appropriate channels 15 for the further dispos;tion of concen~rate a middl;ngs and tailingsO
In typical operationD a suspen~;on of tin~bearing sand is initially fed into one compartment of the feedbox 11 and hence to the upper end of deck A wh;ch is osc;llated w;th appropr;ate frequency, zmplitude ~nd slope to collect (bank) a deposit of material comprised of the particles of a higher densityO
Suitable condit;onsa as a guide~ have been found t~ be as ~' 1~15663 follow~, subject to the f;nding that the wider the deck9 the larger should be the amplitude ant the slower the frequencyO
Particle ~ize to be collected Frequency Amplitude Slope finer than 300 mesh BS 1.72~z 705cm 13/4 coarser than 50 mesh BS lolOHz 14-l5cm 13/4 In general, the f m er the particles~ the higher the fequency and the lower the amplitudeO
Perhsps IOZ of the solids feed may thus be banked until a rea onable thickness of bank9 perhaps 005 cm - 2 cm thick, is built up. The feed is next diverted through the second compartment of feedbox 11 to ehe upper edge of deck B which then starts operating in the manner just de-cr;bed for the f;rst deckO Meanwhile wash water is ~upplied to deck A (which ~ontinues at the previous frequencyg amplitude ant slope) and the splitter 14 is set first to direct the product of deck A to tails~ then ~hen the grade of the deck A product approaches the feed 8rate it may be directed to middlings~ ant to teck B (po~sibly with thickening by a cyclone)0 Wa~h water flow (and feed flow) may be adjusted for optimum performance9 and are pr-ferably fr~m 1 to 2 litre~ per mi~ute, for example 105l/minO The ~, 20 third phase of the cyclical operat;on is the discharge of the banked, ~ilS663 washed concentrate on deck A into its drainO This i8 achieved by operating the tilt pi~tons for deck A to increase the slope from (say) 13/4 to 40 and adju6t;ng the flow of wash water until the banked material i8 effectively dislodged on the deck (flushed off, in other words) and passes through the splitter device to recoveryO
Other ways of removing the concentrate would be by greatly increasing the frequency or amplitude or bothO A typical repeated cycle may involve an 8 minute period tcould be say 6 to 10 minutes) throughout which frequency and amplitude conveniently remain unchanged, as followsO
Deck A Deck B
O - 3 ~upplied w;th feed irrigated with wash water 3 - 4 suppl;et with feed deck slope increased and concentrate flu~hed off 4 - 7 lrrigated with wash deck restored to slight wster slope and supplied with feed 7 - 8 deck slope increased feed supply continues and concentrate flu~hed offO Deck reatored to slight slopeO
' , ~115~63 Referring now to Figure 4~ the drawing ~hows one arrangement for varying the amplitude of oscillationO The deck 20 is supported by tilt mechanisms 21 on a sub-frame 22 which is suspended by suspension S wires 23 from a support frame 240 Fixed to the sub-frame 22 is a bracket 25 to which there is attachet a connecting rod 26 which actuates the sub-frame 22 to perform a linear reciprocating motion.
The connecting rod 26 is secured at its other end to a block 27 which is slidable along an arm 28 connected at its lswer end to a fixed pivot 29~ At its upper end the arm 28 is hinged to a link 30 which is connected to a crank 3to The crank 31 is dri~en by means of a variable speed 750U motor 32 through a belt drive arrangement indicated generally by reference numberal 330 The motor 32 is secured to the support frame 240 Block 27 i8 movable along the arm 28 by t5 means of a pneumatic ~ylinder and piston assembly 340 In operation the arm 28 performs an oscillatory angular movement about the fixed pivot 29 and therefore the throw of the connecting rod 26 and hence the amplitude sf movement of the de~k 20 is dependent upon the position of the block 27 on the arm 280 The above arrangement can be duplicated for each deck and the other de~k (not shown) can therefore ~ .~
~lîS663 be independently varied a~ regards amplitude and frequency of oscillation through its own independent dr;ve systemO ~ariation of amplitude can be achieved through operat~on of the piston and cylinder aæsembly 34 without stopp;ng operation of the equipmentO
In;tiation of the changeovers every few minutes may be by linked pneumatic timers which may be variable pneumatic timers which may be variable to permit variation of the total cycle time and the individual components o ito Instead of single decks A and BD vertically stacked banks of decks A and B are envisaged to provide increased throughput~ as in Pigures 5 and 60 Each deck has its own materials eed l2l and the clean-water feed (for wash water and al80 for flushing) i8 separately fed through individual flexible tubes 12aO The latter feed 12a need only be to a single point ln the upper region of each deckO The former feed 12 i8 distributed over the width of each deck~ but that it i~ alway~ ~u~pens~onD not alternating with clean water, gives advantage~ in switching and in keeping issu;ng ~ets unblockedO
All the decks in a bank drain via a collecting board 40 common to that one bank into one o two ~unnels l3a9 13b depending on the deck slopeO
Each feature of any one of the embod~ment~ shown may be adapted for use in relat;on to any of the other embodimentsO
In our UoKo Patent Specif;cat;on NoO 1,174~405to Mozley published Dec. 17/6Q there is described a gravity separator which was developed primarily to handle tin bearing slimes to recover residual tin which at that time could not be recovered with existing equipment of conventional type.
Apparatus in accordance with U.K. Patent Specificatlon No.
1,1749405 has been available and extensively used for same years and has given excellent performance ena~ling very considerable oavingo to be mate in the tin min;ng and other industriesO The principle of operation of the apparatus of U~Ko Patent Specification ~l~S6~3 NoO 1~1749405 i8 that of adjustlng shear conditions in a flowing suspension by applying a shak;ng motion of variable amplitude and frequency in order to cause he~vier material to remain on a moving surfaceg and form a close packed deposit or bank, whilst the finer particles remain in suspension and advance along the surface~ The decks are freely suspended and are moved by a vibratory shaking action using an unbalanced~weight drive which~ although simple and reliable~ is such tha~ the path traced out by the decks with a given weight rotatlng at fixed radius will undesirably vary according to the total shaken weightO In cer~ain applications9 it has also become neces~ary to employ lower frequencies and then9 particularly when the frequency employed approaches the natural frequency of the app~ratus, control problems can ariseO Accord;ng to the invent;onD a separator for particles of d;ffering densities ha~ all the following features (a) to (e) 8 (a) Two sloplng surfaces each have a supply to the~r upper regiOns o particle~ to be separateda in the form of a flowing ~u~pension in a liquidO
(b) The two surfaces are mounted side by-s;de with their sloping directions parallel and are arranged to perform a repetitious illS6~3 non-discontinuous horizontal mo~ion generally orthogonal to their slopeO
(c) The lower ends of ~he surfaces drain mto separate collecting arrangementsO
(d) The motion is im~arted to the 6urfaces by a positive drive causing the mot;on to follow a path independent of the weight on the sur~aees 0 (e) The separator i~ arr~nged to follow a cycle of operations, with the mot;on applied to ~he surfaces throughout9 in a first phase of which one surface i~ receiving the guspension while the other surfaee receives a~ a eomparable ra~e the suspending liquid without particlesD followed by a ~hange in shear conditions on that other surface to flush off the partieles still remaining on it, the sècond phase being a reversal of roles of the surfaces~ the two phases alternating~ the collecting arrangement~ separating different time-intervals of particles draining into themO
ThusO in general terms~ the present invention provides a gravity separator designed to apply an o~cillatory motion in a transverse direction rela~ive to ~he progressive movement down a slcpe of a ZO flawing suspension 3nd capable of operating a~ high amplitudes, eOgO
lllS663 at least I cmO and pos~ibly a~ large as 20 cm or more~ and preferably from 4 to 18 cmD for example 5 to 15 cm~ or 6 to 12 cmO Thi8 apparatu~ comprlses ~wo sloping separa~;ng surfaces each receiving material to be treated~ hereinafter termed "decks"~ mounted side by side and arranged to perform a repetitious non~d;scontinuous horizontal motion eOgO linear~ orbital or other oscillatory motion~
preferably simple harmonic motion~ in a generally transverse direction relative to the slope of the deckO Jerky mo~io~ ~ust be avoidedO The decks are driven by a positi~e drive which c~uses the;r motion to follow a path ;ndependent of the we;ght of material deposlted on ~hem fr3m the suspension being treatedO The positive drive also avoids problems of loss of controL a~ lower frequenciesO
In the gravity separator according to the presen~ ;nvention the cycle of operations i~ 80 organised that at any one time one of the decks is functioning as a collect;ng ~urface on which banking of heavy deposits i8 tak;ng pla~e~ whilst on the o~her deck prev;ously banked material ;8 be;ng further separated and is then removed by al~eration of the ~hear conditions thereon to cause banked material to be resuspended in a stream of washing l;quidO Consequently~ the apparatus enrails means for adJusting the shear rondition~ on each of l~lS663 the decks preferably by alteration of 810pe and/or by adjustment of amplitude and/or by ad~usting frequency of oscillation; the last-named for example by interchangeable drive belts or a gearboxO
The simplest arrangement 18 one in which the two decks share a common subframe and thus are driven by a common drive means and shear contitions are altered by adjustment of slopeO However, because the two decks are operated for the most part in sequence, they may be arranged to be driven independently thus giving more flexibility in selecting running conditionsa eOgO amplitude and frequencyO To save floor ~paceS there may be ln place of each deck a stack of (for example 4 or 6) decks fixed on top of each other, each receiving its own supply of material to be treated~ but each discharging into a drain common to that stackO
The slope (when running as a collecting surface) is preferably 15 within the range l03 to 205, more preferably 105 to 202, most preferably I o6 to 2 0 The frequency of oscillation i5 preferably within the range of 008 ~o 3 ~Za more preferably 105 to 2 Hzo If the atep of flushing (removal of banked solids) entails altering the alopes the 810pe then may be 10 to 60a eOgO 30 to 45o The in~ention will now be descr;bed with reference to the :1115~63 accompanging drawings~ in which F;gure I is a plan vlew~ Figure 2 an elevation and F;gure 3 an end elevation of one embodlment of a separator according to the lnvention D
Figure 4 is an elevation of part of a second embodlment, F;gure 5 i8 a perspect;ve schematic view of a third embodiment~
and Figure 6 iB an end elevat;on of the embodiment of Figure 5, in its rest pos;tionO
Turning ~o Figures 1 ~ 3~ the separator comprises two plane decks A and B of wld~h 105m and of length 102m and with upturned ~ide edgesO The deeks A and B are mounted s;de by side on support ~ub-rames 1 su~pended by vert;cal support wires 2 from a support frsme 30 A s;ngle ~ubfrsme I common to both decks is also possibleO
1~ under certa~n operat;ng condlt;ons there appears a tendency for the wire~ 2 to spring or ~lacken cycl;cally~ causing the decks to bvunceD ~he wires can be augmented or replaced by floor-mounted pneuma~;c ~tiffening rocking atruts~ Horizontal longitudinsl restraining wires 4 also connect the sub-frames 1 to the support rame 3 80 that the sub~frames 1~ and hence the decks, cannot move in l~S663 the longitud;nal directionO The w;res 4 may be augmented or replaced by transverse rails welded to the subframes 1, the rails running between floor-mounted roller guides~ The deck~ A and B are mounted on pivots 5 a~d are adJustable in slope by means of tilt p;stons 60 The decks are driven by a common drive comprising pusher rods 7 driven by a cranked drive shaft 8 off a motor 90 At the top end of the sloping decks D shown on the right in Figure 3~ is mcunted a suspens;on feed dev;ce comprising a feed pipe lO supplying a two compartment feedbox 11 leading through flexible ducting 12 to the top end~ of the decks A and Bo At the boet~m end of the decks, receiv;ng material flowing off the bottom of each deckD is a drain ;n the form of a funnel 13 feed;ng through a spli~ter dev;ce 14 into appropriate channels 15 for the further dispos;tion of concen~rate a middl;ngs and tailingsO
In typical operationD a suspen~;on of tin~bearing sand is initially fed into one compartment of the feedbox 11 and hence to the upper end of deck A wh;ch is osc;llated w;th appropr;ate frequency, zmplitude ~nd slope to collect (bank) a deposit of material comprised of the particles of a higher densityO
Suitable condit;onsa as a guide~ have been found t~ be as ~' 1~15663 follow~, subject to the f;nding that the wider the deck9 the larger should be the amplitude ant the slower the frequencyO
Particle ~ize to be collected Frequency Amplitude Slope finer than 300 mesh BS 1.72~z 705cm 13/4 coarser than 50 mesh BS lolOHz 14-l5cm 13/4 In general, the f m er the particles~ the higher the fequency and the lower the amplitudeO
Perhsps IOZ of the solids feed may thus be banked until a rea onable thickness of bank9 perhaps 005 cm - 2 cm thick, is built up. The feed is next diverted through the second compartment of feedbox 11 to ehe upper edge of deck B which then starts operating in the manner just de-cr;bed for the f;rst deckO Meanwhile wash water is ~upplied to deck A (which ~ontinues at the previous frequencyg amplitude ant slope) and the splitter 14 is set first to direct the product of deck A to tails~ then ~hen the grade of the deck A product approaches the feed 8rate it may be directed to middlings~ ant to teck B (po~sibly with thickening by a cyclone)0 Wa~h water flow (and feed flow) may be adjusted for optimum performance9 and are pr-ferably fr~m 1 to 2 litre~ per mi~ute, for example 105l/minO The ~, 20 third phase of the cyclical operat;on is the discharge of the banked, ~ilS663 washed concentrate on deck A into its drainO This i8 achieved by operating the tilt pi~tons for deck A to increase the slope from (say) 13/4 to 40 and adju6t;ng the flow of wash water until the banked material i8 effectively dislodged on the deck (flushed off, in other words) and passes through the splitter device to recoveryO
Other ways of removing the concentrate would be by greatly increasing the frequency or amplitude or bothO A typical repeated cycle may involve an 8 minute period tcould be say 6 to 10 minutes) throughout which frequency and amplitude conveniently remain unchanged, as followsO
Deck A Deck B
O - 3 ~upplied w;th feed irrigated with wash water 3 - 4 suppl;et with feed deck slope increased and concentrate flu~hed off 4 - 7 lrrigated with wash deck restored to slight wster slope and supplied with feed 7 - 8 deck slope increased feed supply continues and concentrate flu~hed offO Deck reatored to slight slopeO
' , ~115~63 Referring now to Figure 4~ the drawing ~hows one arrangement for varying the amplitude of oscillationO The deck 20 is supported by tilt mechanisms 21 on a sub-frame 22 which is suspended by suspension S wires 23 from a support frame 240 Fixed to the sub-frame 22 is a bracket 25 to which there is attachet a connecting rod 26 which actuates the sub-frame 22 to perform a linear reciprocating motion.
The connecting rod 26 is secured at its other end to a block 27 which is slidable along an arm 28 connected at its lswer end to a fixed pivot 29~ At its upper end the arm 28 is hinged to a link 30 which is connected to a crank 3to The crank 31 is dri~en by means of a variable speed 750U motor 32 through a belt drive arrangement indicated generally by reference numberal 330 The motor 32 is secured to the support frame 240 Block 27 i8 movable along the arm 28 by t5 means of a pneumatic ~ylinder and piston assembly 340 In operation the arm 28 performs an oscillatory angular movement about the fixed pivot 29 and therefore the throw of the connecting rod 26 and hence the amplitude sf movement of the de~k 20 is dependent upon the position of the block 27 on the arm 280 The above arrangement can be duplicated for each deck and the other de~k (not shown) can therefore ~ .~
~lîS663 be independently varied a~ regards amplitude and frequency of oscillation through its own independent dr;ve systemO ~ariation of amplitude can be achieved through operat~on of the piston and cylinder aæsembly 34 without stopp;ng operation of the equipmentO
In;tiation of the changeovers every few minutes may be by linked pneumatic timers which may be variable pneumatic timers which may be variable to permit variation of the total cycle time and the individual components o ito Instead of single decks A and BD vertically stacked banks of decks A and B are envisaged to provide increased throughput~ as in Pigures 5 and 60 Each deck has its own materials eed l2l and the clean-water feed (for wash water and al80 for flushing) i8 separately fed through individual flexible tubes 12aO The latter feed 12a need only be to a single point ln the upper region of each deckO The former feed 12 i8 distributed over the width of each deck~ but that it i~ alway~ ~u~pens~onD not alternating with clean water, gives advantage~ in switching and in keeping issu;ng ~ets unblockedO
All the decks in a bank drain via a collecting board 40 common to that one bank into one o two ~unnels l3a9 13b depending on the deck slopeO
Each feature of any one of the embod~ment~ shown may be adapted for use in relat;on to any of the other embodimentsO
Claims (15)
1. An apparatus for separating particles of differing densities in a suspension which comprises:
a) two sloping surfaces mounted in side-by-side relation-ship having their sloping directions parallel;
b) means provided to perform a repetitious non-discontinuous horizontal motion to said surfaces generally orthogonal to their slope;
c) separate collecting arrangement means located at lower ends of said surfaces;
d) positive drive means to impact motion to said surface and causing said motion to follow a path independent of the weight on the surfaces;
e) cyclic operational means to provide in a first phase one surface to receive the suspension while the other surface receives at a comparable rate a suspending liquid without particles, effecting by a change in shear conditions on said other surface to flush off particles remaining thereon and a second phase being a reversal of the roles of the surfaces, the two phases alternating with said collecting arrangement means separating different time-intervals of particles.
a) two sloping surfaces mounted in side-by-side relation-ship having their sloping directions parallel;
b) means provided to perform a repetitious non-discontinuous horizontal motion to said surfaces generally orthogonal to their slope;
c) separate collecting arrangement means located at lower ends of said surfaces;
d) positive drive means to impact motion to said surface and causing said motion to follow a path independent of the weight on the surfaces;
e) cyclic operational means to provide in a first phase one surface to receive the suspension while the other surface receives at a comparable rate a suspending liquid without particles, effecting by a change in shear conditions on said other surface to flush off particles remaining thereon and a second phase being a reversal of the roles of the surfaces, the two phases alternating with said collecting arrangement means separating different time-intervals of particles.
2. The apparatus according to claim 1, wherein the motion has an amplitude of at least 1 cm.
3. The apparatus according to claim 1, wherein the motion has an amplitude of 4 to 18 cm.
4. The apparatus according to claim 1, wherein the motion has an amplitude of 5 to 15 cm.
5. The apparatus according to claim 1, wherein the motion has an amplitude of 6 to 12 cm.
6. The apparatus according to claim 1 wherein the motion has an amplitude of 20 cm or more.
7. The apparatus according to claim 1, wherein the motion is simple harmonic motion.
8. The apparatus according to claim 1, wherein the change in shear conditions is achieved by increasing the slope, and wherein the two surfaces share a common driven subframe.
9. The apparatus according to claim 1, wherein the slope is from 1.3° to 2.5°.
10. The apparatus according to claim 9, wherein the slope is 1.5° to 2.2°.
11. The apparatus according to claim 9, wherein the slope is 1.6° to 2°
12. The apparatus according to claim 1, wherein the fre-quency of the motion is from 0.8 to 3Hz.
13. The apparatus according to claim 12, wherein the frequency of the motion is from 1.5 to 2Hz.
14. The apparatus according to claim 1, wherein in place of each of the two surfaces there is a stack of parallel surfaces fixed above each other, each surface receiving its own supply of particles to be separated, but each discharging into a collecting arrangement common to that stack.
15. A method of separating particles of differing densities, comprising supplying a flowing suspension of the particles in a liquid to the upper regions of the decks of the separator having two sloping surfaces mounted in side-by-side relation with the directions of slope being parallel, causing the decks to perform a repetitious smooth horizontal motion generally orthogonal to their slope, and causing the , 14 separator to follow a cycle of operations, with the motion applied to the surfaces throughout, in a first phase of which one surface is receiving the suspension while the other surface receives at a comparable rate the sus-pending liquid without particles, followed by a change in shear conditions on that other surface to flush off the particles still remaining thereon and a second phase being a reversal of roles of the surfaces, the two phases alternating with collecting arrangements which are arranged to present different compartments to receive different time-intervals of particles draining into them.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB12655/77A GB1576469A (en) | 1977-03-25 | 1977-03-25 | Sand separator |
| GB12655/77 | 1977-03-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1115663A true CA1115663A (en) | 1982-01-05 |
Family
ID=10008707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA299,669A Expired CA1115663A (en) | 1977-03-25 | 1978-03-23 | Tandem transversely vibrated inclined bed liquid treated stratifiers |
Country Status (7)
| Country | Link |
|---|---|
| AU (1) | AU518515B2 (en) |
| CA (1) | CA1115663A (en) |
| GB (1) | GB1576469A (en) |
| HK (1) | HK30184A (en) |
| MY (1) | MY8500219A (en) |
| SG (1) | SG76883G (en) |
| ZA (1) | ZA781616B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8612497D0 (en) * | 1986-05-22 | 1986-07-02 | Mozley R H | Minerals separator |
| GB8612498D0 (en) * | 1986-05-22 | 1986-07-02 | Mozley R H | Minerals separator |
| GB8809834D0 (en) * | 1988-04-26 | 1988-06-02 | Marriott P A | Separator |
| AU2704899A (en) * | 1997-11-18 | 1999-06-07 | Valery Konstantinovich Mamaev | Underwater trap for alluvial minerals and variants |
-
1977
- 1977-03-25 GB GB12655/77A patent/GB1576469A/en not_active Expired
-
1978
- 1978-03-20 ZA ZA00781616A patent/ZA781616B/en unknown
- 1978-03-23 CA CA299,669A patent/CA1115663A/en not_active Expired
- 1978-04-05 AU AU34804/78A patent/AU518515B2/en not_active Expired
-
1983
- 1983-12-02 SG SG768/83A patent/SG76883G/en unknown
-
1984
- 1984-04-05 HK HK301/84A patent/HK30184A/en not_active IP Right Cessation
-
1985
- 1985-12-30 MY MY219/85A patent/MY8500219A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| MY8500219A (en) | 1985-12-31 |
| HK30184A (en) | 1984-04-13 |
| GB1576469A (en) | 1980-10-08 |
| ZA781616B (en) | 1979-02-28 |
| AU3480478A (en) | 1979-10-11 |
| SG76883G (en) | 1984-08-03 |
| AU518515B2 (en) | 1981-10-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |