EP0040519A1 - Bac à pistonnage pour la séparation de matériaux et procédé pour séparer le charbon du schiste - Google Patents

Bac à pistonnage pour la séparation de matériaux et procédé pour séparer le charbon du schiste Download PDF

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Publication number
EP0040519A1
EP0040519A1 EP81302159A EP81302159A EP0040519A1 EP 0040519 A1 EP0040519 A1 EP 0040519A1 EP 81302159 A EP81302159 A EP 81302159A EP 81302159 A EP81302159 A EP 81302159A EP 0040519 A1 EP0040519 A1 EP 0040519A1
Authority
EP
European Patent Office
Prior art keywords
wash
water
box
compression chamber
pressure
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.)
Granted
Application number
EP81302159A
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German (de)
English (en)
Other versions
EP0040519B1 (fr
Inventor
Geoffrey Francis Craven
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MITCHELL COTTS MINING EQUIPMENT LIMITED
Original Assignee
Mitchell Cotts Mining Equipment Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitchell Cotts Mining Equipment Ltd filed Critical Mitchell Cotts Mining Equipment Ltd
Priority to AT81302159T priority Critical patent/ATE19209T1/de
Publication of EP0040519A1 publication Critical patent/EP0040519A1/fr
Application granted granted Critical
Publication of EP0040519B1 publication Critical patent/EP0040519B1/fr
Expired legal-status Critical Current

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    • 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
    • B03B5/10—Washing granular, powdered or lumpy materials; Wet separating using shaken, pulsated or stirred beds as the principal means of separation on jigs
    • B03B5/24—Constructional details of jigs, e.g. pulse control devices

Definitions

  • This invention is concerned with improvements relating to the separation of materials, produced for example by a mining operation, into fractions of differing densities.
  • a wash-box essentially in the form of a vessel which affords one or more stratification compartments.
  • a sloping, perforate grid plate extends across an upper part of each stratification compartment, and the vessel is filled to a level above.the grid plate with a liquid such as water, the water flowing through the vessel from one end (the inlet end) to an outlet end.
  • Raw material is deposited on the grid plate at the inlet end, and means is provided to cause rising and falling movement of the water level in the stratification compartments.
  • the raw material As water flows through the grid plate, the raw material is lifted from the grid plate. Since the heavier (i.e. more dense) particles will tend to fall through the water at a greater rate than the lighter (i.e. less dense) particles, as the material falls back onto the grid plate, the heavier particles (shale) will tend to form the bottom layer, and the lighter particles (coal) will tend to overlie the heavier layer.
  • the water level in the stratification compartment is allowed to fall, and the operation is repeated, the raw material to be stratified into layers of different densities.
  • a convenient method of causing rising and falling movement of the water in the stratification compartment is to provide under water communication of the stratification compartment with a compression chamber, which is alternately pressurised and depressurised.
  • a conventional wash-box is of generally U-shape in cross-section, and is divided longitudinally by a vertical wall which terminates short of the base of the wash-box, the region of the wash-box on one side of the wall being open to atmosphere,and affording the stratification compartment, and the region of the wash-box on the other side of the wall being enclosed, and affording the compression chamber.
  • An inlet opening extends into the compression chamber whereby the chamber is alternately connected to a supply of air under pressure, and opened to atmosphere, conveniently by use of rotary valve.
  • a separating device Positioned above the grid plate and extending transversely to the direction of movement of the raw material is a separating device. Material passing above the Separating device (predominantly coal) passes into a primary outlet of the wash-box, and material passing beneath the separating device (predominantly shale) falls from the grid plate into a reject extraction chamber of the wash-box.
  • a wash-box comprising at least one stratification compartment, a perforate grid plate extending across an upper part of the stratification compartment, means by which water is admitted to the wash-box, and means to cause rising and falling movement of water in the stratification compartment and which comprises a compression chamber in underwater communication with the stratification compartment and pressure applying means operative alternately to pressurise and depressurise the compression chamber, wherein the wash-box comprises a control device adapted to generate a control signal which is functional of the pressure in the compression chamber, and which may be used to control the admission of water to the-w ash-box in accordance with said control signal.
  • the control signal may be displayed visually, to be utilised by an operative to manually adjust the admission of water to the wash-box in accordance with the control signal: such a facility is most advantageous in the initial setting up of the wash-box, to enable the wash- box to handle most conveniently a specific grade of raw material, and may be optionally utilised as a safety feature.
  • an alarm may be activated to call to the attention of the operative the need for the admission of water to the wash-box to be adjusted.
  • the wash-box comprises means responsive to the control signal automatically to control the admission of water to the wash-box in dependence upon said control signal.
  • the control device will generate a control signal which will cause, or which will indicate the desirability of, an increase in the rate of flow of water to the wash-box,to ensure,or to tend to ensure, that the water level in the compression chamber returns to a level not significantly lower than a desired level.
  • the effectiveness of the application of air under pressure to the compression chamber will be retained or restored, retaining or restoring the amplitude of the pulsion stroke to an optimum desired level.
  • tendency for the creation of negative pressure beneath the grid plate, as would tend to draw fine coal deeply into the bed is reduced.
  • the control device may be operative to measure the mean level of water in the compression chamber and to cause, or to indicate the desirability of, an increase the rate at which water is admitted to the wash-box, in the event of detecting a fall in said mean level. In this manner,the level of water in the compression chamber after each suction stroke may be maintained at an optimum level, avoiding any significant reduction in amplitude of the pulsion stroke.
  • control device is operative to measure the pressure pertaining in the wash-box, and to cause, or to indicate the desirability of, an increase the rate at which water is admitted to the wash-box, in the event of detecting a reduction in said pressure, as would happen in the event of a pulsion stroke being applied whilst some water is retained trapped above the grid plate.
  • restoration action is not effected until a pulsion stroke of reduced amplitude has been applied to the stratification compartment, it does remove the problems of measuring the mean water level in the compression chamber, since in practice water will continue to flow through the grid plate, notwithstanding the presence of an excessive quantity of fine coal, although at a greatly reduced rate.
  • the pressure measured by the control device may be the maximum pressure pertaining in the wash-box on each pulsion stroke, or may be an average pressure over one complete cycle of pulsion and suction strokes.
  • the control signal generated by the control device is proportional to the root-mean-square value of the pressure, conveniently that pertaining in the compression chamber, over one-or more cycles of pulsion and suction strokes, and the control device controls the admission of water to the wash-box in a manner such that the quantity of water additionally admitted is generally proportional to the difference between said root-mean-square value and a predetermined, desired value.
  • a method of separating coal from shale involving the use of a wash-box comprising a stratification compartment, a perforate grid plate extending across an upper part of the stratification compartment, means by which water is admitted to the wash-box, and means to cause cyclic vertical movement of the water in the stratification compartment, wherein a measurement is taken during some at least of successive cycles of movement of the water in the stratification compartment, and such measurement is utilised to determine the rate at which water is admitted to the wash-box.
  • FIGURE 1 is a schematic longitudinal sectional view of the preferred embodiment
  • FIGURE 2 is a schematic view of a control device of said wash-box.
  • the wash-box which is the preferred embodiment of this invention is basically similar to the wash-box described in detail in the specification of our afore- mentoned U.K. and U.S. Patent specifications, to which reference may be made for details of construction not included in the following description.
  • the wash-box is thus in the form of an elongate vessel,generally U-shaped in cross-section, divided by lateral walls (not shown) into adjacent sections.
  • the vessel is also divided by a longitudinally-extending vertical wall 6 ( Figure 1) which terminates at a point spaced from the base of the vessel, to divide each section into a stratification compartment 8 and a compression chamber 10.
  • Extending across an upper part of the stratification compartment is a perforate grid plate 12, and the vessel is initially filled to a level indicated L1, above the level of the grid plate, the compression chamber 10 being in underwater communication with the stratification compartment 8.
  • the stratification compartment 8 is open at the top to atmosphere, but the compression chamber 10 is enclosed. However, extending into the compression chamber is an inlet 14,whereby the compression chamber may be placed alternately in communication with an airline 18,or an exhaust port 19,open to atmosphere, by means of a three-way valve 16.
  • a quantity of raw material which includes heavier and lighter fractions (e.g. shale and coal), is deposited on the grid plate 12.
  • the valve 16 is driven by a rotary drive-shaft (not shown) which at a first stage in a cycle of operation of the wash-box causes the compression chamber 10 to be placed in communication with the source 18 of air under pressure. Pressurisation of the chamber 10 depresses the water level from the level L1 to a level L2, forcing the water displaced into the stratification compartment, water flowing upwardly through the perforations in the grid plate 12, initiating a stratification of the material on the grid plate. Under normal operating circumstances, the water in the stratification compartment may rise to a level shown L3, with excess water flowing in a direction forwardly of the washbox, towards the outlet.
  • the rotary valve 16 places the inlet port 14 in communication with the outlet 19, opening the compression chamber 10 to atmosphere.
  • Water from the stratification compartment now flows downwardly through the raw material on the grid plate and through the perforations in the grid plate, returning to the compression chamber 10.
  • a supply of water enters the washbox through an underwater inlet 20, the rate of which is controlled by a valve 22.
  • the quantity of water which flows through the inlet in each cycle of pulsion and suction strokes is sufficient to ensure that the level of water in both the stratification compartment and the compression chamber is restored to the original level L 1 .
  • the level of water in the stratification compartment 8 falls from the level L3
  • the fine material is drawn into the interstices between the larger particles of material on the grid plate, to an extent such as may significantly reduce, or stop entirely, the downward flow of water from the stratification compartment.
  • the level of water in the stratification compartment may fall only to a level between the levels L3 and L1, and this quantity of water, together with the water admitted through the inlet 20, causes the level in the compression chamber 10 to rise only to the level L5 (between the levels L2 and L1).
  • the wash-box which is the preferred embodiment of this invention comprises a control device 24 adapted to take a measurement during some at least of successive cycles of movement of the water in the stratification compartment of conditions pertaining within the wash-box, such measurement being utilised to determine the rate at which water is admitted to the wash-box.
  • the control device 24 is adapted to generate a control signal which is functional of the water level attained in the compression chamber subsequent to depressurising of the chamber, and which is operative to control the valve 22.
  • the control device comprises an electrical pressure-to-voltage transducer 26, which may either be located within the compression chamber 10, or mounted external to the compression chamber, but in communication therewith via a pipe fitting sealed through the roof of the chamber 10.
  • the transducer 26 Over one complete cycle of pulsion and suction strokes (i.e. one complete rotation of the valve 16) the transducer 26 will generate a cyclically varying voltage wave-form whose peak to peak amplitude corresponds with the maximum and minimum air pressure in the chamber 10.
  • the wave form is not sinusoidal, and its shape will be dependant upon the characteristics of the valve 16, and in particular on the timing of the pressurising and depressurising of the chamber 10.
  • the output of the transducer 26 is fed to a control unit 24, and in particular to an electronic processor P thereof, which extracts the root-mean-square (RMS) value of the wave form generated by the transducer 26, according to the transfer function: where Ep RMS is the root-mean-square value of , Ep 2 , the square of instantaneous pressure.
  • the equation shows that the RMS value is independent of wave form and frequency.
  • the output of the processor P is fed as an input to an integrator I, which derives a control signal.
  • the integrator has a time base which extends over a number of pulsation cycles of the washbox; in this manner, the effects on the control signal of any short term variables (which may be an untypical variable occurring in a single cycle, or residual ripple) are reduced.
  • the control signal is displayed on a suitably calibrated meter M, to assist in adjusting the wash-box for optimum performance.
  • the control signal is applied to the input terminal 1 of a comparitor C, a comparative input,derived from an adjustable set point variable voltage divider D,being applied to the input terminal 2. Any difference between the inputs to the comparitor C will result in an output voltage whose EMF is proportional to the difference between the control signal and the comparative signal, and whose polarity is indicative of whether the measured value is greater or less than the comparative value.
  • the output voltage of the comparitor C is applied to a two term (proportional plus integral) process controller X, and thence to an actuator A, mechanically coupled to the regulating valve 22.
  • control valve 22 when a quantity of water is retained trapped above the grid plate, the control valve 22 will be operated to increase the rate of admission of water to the compression chamber 10, to restore the water level to its desired level, L1.
  • the peak value of pressure detected in the chamber 10 by the transducer 26, during the pulsion stroke may be utilised generally as follows:
  • the regulating valve 22 may be altered to compensate for variations in the conditions pertaining in the washbox more quickly than the method first described, in which the root-mean-square value is utilised.
  • a control system would comprise means to prevent adjustment of the regulating valve for a single, perhaps untypical value, and until a trend has been established by comparing two or more successive control signals.
  • control over the regulating valve may be achieved jointly by both the establishment of a root-mean-square value over a number of pulsation cycles, and by the measurement of the peak-to-peak amplitude of the pressure in the chamber 10.
  • the wash-box which is the preferred embodiment of this invention comprises a plurality of adjacent sections, each section comprising a stratification compartment 8 and communicating compression chamber 10.
  • Each compression chamber 10 comprises an individual inlet, through which air under pressure may be admitted, and each section comprises an under water .inlet 20, having an adjustable valve 22 to control the flow of water into the section in accordance with the average pressure pertaining in the compression chamber over a complete cycle of pulsion and suction strokes of the wash-box.
  • control' signal generated by the control device is operative automatically to vary the rate at which water is admitted to the wash-box by direct control of the regulating valves 22, the invention may be utilised to advantage in a part-manual operation, particularly in which the control device displays the control signal in a manner such as to indicate to an operative the desirability of varying the rate at which water is admitted to the wash-box, which the operative may then carry out manually by manual adjustment of the valve 22.
  • Such an operation is particularly useful in enabling the wash-box to be "set up” for an operation to separate the constituents of a particular grade of raw materials, enabling the operative to be provided with information pertaining to the conditions in the wash-box, so that the operative may make compensatory adjustments to the rate at which water is admitted to the wash-box.
  • the control device additionally comprises an alarm, which is activated in the event of the control signal subsequently varying by more than a predetermined amount, from a desirable value. In this manner after setting up of the wash-box, the attention of the operative may be called to the need for the admission of water to the wash-box to be adjusted, if the way in which the wash-box is operating begins to depart significantly from its optimum performance.

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  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Saccharide Compounds (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
EP81302159A 1980-05-15 1981-05-15 Bac à pistonnage pour la séparation de matériaux et procédé pour séparer le charbon du schiste Expired EP0040519B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81302159T ATE19209T1 (de) 1980-05-15 1981-05-15 Setzmaschine zum trennen von material und verfahren zum trennen von kohle und schiefer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8016117 1980-05-15
GB8016117 1980-05-15

Publications (2)

Publication Number Publication Date
EP0040519A1 true EP0040519A1 (fr) 1981-11-25
EP0040519B1 EP0040519B1 (fr) 1986-04-16

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ID=10513448

Family Applications (1)

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EP81302159A Expired EP0040519B1 (fr) 1980-05-15 1981-05-15 Bac à pistonnage pour la séparation de matériaux et procédé pour séparer le charbon du schiste

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EP (1) EP0040519B1 (fr)
AT (1) ATE19209T1 (fr)
DE (1) DE3174384D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3237248A1 (de) * 1982-10-07 1984-04-12 Vorošilovgradskij filial gosudarstvennogo proektno-konstruktorskogo i naučno-issledovatel'skogo instituta po avtomatizacii ugol'noj promyšlennosti "Giprougleavtomatizacija", Vorošilovgrad Verfahren und einrichtung zur steuerung des pulsierenden trennfluessigkeitsstromes in nasssetzmaschinen
AU573442B2 (en) * 1986-04-29 1988-06-09 Zabrzanskie Gwarectwo Weglowe Kopalnia Wegla Kamiennego "Zabrze-Bielszowice" Pulsator
FR2617972A1 (fr) * 1987-07-09 1989-01-13 Fives Cail Babcock Procede et systeme de regulation de la frequence des pulsations d'un appareil de classement densimetrique a pistonnage pneumatique
WO2016078633A1 (fr) * 2014-11-19 2016-05-26 Akai Gmbh & Co. Kg Procédé et dispositif de séparation de substances en fonction de leur densité

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010018976B4 (de) * 2010-04-27 2011-11-17 Mbe Coal & Minerals Technology Gmbh Verfahren zum Betrieb einer Setzmaschine

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB453784A (en) * 1935-03-21 1936-09-18 Int Comb Ltd Improvements in or relating to plant for cleaning coal and other like granular material
GB811460A (en) * 1956-04-26 1959-04-08 Automatic Coal Cleaning Compan Apparatus for controlling and recording the operation of washer boxes
GB991535A (en) * 1963-12-24 1965-05-12 Westfalia Dinnendahl Jig with jig compartments symmetrically arranged on both sides of a central compressed air chamber
FR1408196A (fr) * 1964-03-06 1965-08-13 Stamicarbon Procédé et dispositif pour la séparation de particules de densité différente
GB1084581A (en) * 1964-11-12 1967-09-27 Schuchtermann & Kremer Baum Ag Apparatus for controlling the intensity of the jigging pulses in jigging machines in which the pulstation chambers are disposed below the jig screen
DE2539374A1 (de) * 1975-09-04 1977-03-10 Kloeckner Humboldt Deutz Ag Verfahren und vorrichtung zur aufbereitung von mineralgemischen, insbesondere von rohwaschkohle auf einer druckluftgesteuerten nassetzmaschine
US4019981A (en) * 1973-10-20 1977-04-26 Klockner-Humboldt-Deutz Aktiengesellschaft Method and apparatus for the preparation of mineral mixtures on a jig controlled by compressed air
FR2392720A1 (fr) * 1977-01-15 1978-12-29 Norton Harty Colliery Eng Ltd Caisson de lavage pour la separation de materiaux

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB453784A (en) * 1935-03-21 1936-09-18 Int Comb Ltd Improvements in or relating to plant for cleaning coal and other like granular material
GB811460A (en) * 1956-04-26 1959-04-08 Automatic Coal Cleaning Compan Apparatus for controlling and recording the operation of washer boxes
GB991535A (en) * 1963-12-24 1965-05-12 Westfalia Dinnendahl Jig with jig compartments symmetrically arranged on both sides of a central compressed air chamber
FR1408196A (fr) * 1964-03-06 1965-08-13 Stamicarbon Procédé et dispositif pour la séparation de particules de densité différente
GB1084581A (en) * 1964-11-12 1967-09-27 Schuchtermann & Kremer Baum Ag Apparatus for controlling the intensity of the jigging pulses in jigging machines in which the pulstation chambers are disposed below the jig screen
US4019981A (en) * 1973-10-20 1977-04-26 Klockner-Humboldt-Deutz Aktiengesellschaft Method and apparatus for the preparation of mineral mixtures on a jig controlled by compressed air
DE2539374A1 (de) * 1975-09-04 1977-03-10 Kloeckner Humboldt Deutz Ag Verfahren und vorrichtung zur aufbereitung von mineralgemischen, insbesondere von rohwaschkohle auf einer druckluftgesteuerten nassetzmaschine
FR2392720A1 (fr) * 1977-01-15 1978-12-29 Norton Harty Colliery Eng Ltd Caisson de lavage pour la separation de materiaux
US4176749A (en) * 1977-01-15 1979-12-04 Nortn-Harty Colliery Engineering Limited Materials separation

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3237248A1 (de) * 1982-10-07 1984-04-12 Vorošilovgradskij filial gosudarstvennogo proektno-konstruktorskogo i naučno-issledovatel'skogo instituta po avtomatizacii ugol'noj promyšlennosti "Giprougleavtomatizacija", Vorošilovgrad Verfahren und einrichtung zur steuerung des pulsierenden trennfluessigkeitsstromes in nasssetzmaschinen
AU573442B2 (en) * 1986-04-29 1988-06-09 Zabrzanskie Gwarectwo Weglowe Kopalnia Wegla Kamiennego "Zabrze-Bielszowice" Pulsator
FR2617972A1 (fr) * 1987-07-09 1989-01-13 Fives Cail Babcock Procede et systeme de regulation de la frequence des pulsations d'un appareil de classement densimetrique a pistonnage pneumatique
WO2016078633A1 (fr) * 2014-11-19 2016-05-26 Akai Gmbh & Co. Kg Procédé et dispositif de séparation de substances en fonction de leur densité

Also Published As

Publication number Publication date
EP0040519B1 (fr) 1986-04-16
DE3174384D1 (en) 1986-05-22
ATE19209T1 (de) 1986-05-15

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