EP0921860A1 - Verfahren zur steuerung einer sortier- und klassiervorrichtung für sand und kies - Google Patents
Verfahren zur steuerung einer sortier- und klassiervorrichtung für sand und kiesInfo
- Publication number
- EP0921860A1 EP0921860A1 EP97935480A EP97935480A EP0921860A1 EP 0921860 A1 EP0921860 A1 EP 0921860A1 EP 97935480 A EP97935480 A EP 97935480A EP 97935480 A EP97935480 A EP 97935480A EP 0921860 A1 EP0921860 A1 EP 0921860A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sand
- fine sand
- fluidized bed
- fraction
- raw material
- 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
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
- B03B5/62—Washing granular, powdered or lumpy materials; Wet separating by hydraulic classifiers, e.g. of launder, tank, spiral or helical chute concentrator type
-
- 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
- B03B13/00—Control arrangements specially adapted for wet-separating apparatus or for dressing plant, using physical effects
-
- 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
- B03B5/62—Washing granular, powdered or lumpy materials; Wet separating by hydraulic classifiers, e.g. of launder, tank, spiral or helical chute concentrator type
- B03B5/623—Upward current classifiers
Definitions
- the invention relates to a method for controlling the product composition in a device for classifying and sorting mineral raw materials, in particular sand and gravel, which consists of a feed arrangement for the raw material feed and at least one chamber for removing the light materials from the sand product fraction with a sand product discharge and an overflow for the light materials, the chamber being designed as a sorting area working according to the fluidized bed method for sorting the raw material feed.
- a device for the separation of light materials from sand and gravel corresponding to the aforementioned features is in the brochure "MAB fluidized bed sorter - Hydrosort I" the Schauenburg Maschinen- und Anlagen-Bau GmbH described; In this device, the raw material feed consisting of sand of different grain sizes is introduced into the cylindrical single-chamber container with an essentially flat bottom and discharges for the cleaned sand arranged therein.
- the single-chamber tank is charged with upstream water, so that a fluidized bed with a very high turbidity density is built up in the single-chamber tank using the fine fractions of sand contained in the raw material feed, which can float organic contaminants contained in the raw material feed, especially heavily carbonized wood , so that the impurities as well as mud-like fines are washed out with the overflow water.
- the invention is therefore based on the object of specifying a method for controlling the product composition in a device with the aforementioned features, by means of which a predetermined concentration of fine sand in the amount of sand product can be achieved.
- the basic idea of the invention provides that in addition to the layer height of the fluidized bed in the chamber, there is also a classifying separation of the sand fraction into a quantity of sand product and into a fine sand fraction to be discharged via the overflow, and that to set a predetermined concentration of fine sand in the Sand product quantity, the height of the fluidized bed is regulated in such a way that the proportion of fine sand in the raw material feed quantity can be rushed by means of the fluidized bed depending on the predetermined permissible concentration into a proportion of fine sand to be applied in the quantity of sand product and into a proportion of fine sand to be discharged via the overflow, whereby For all geometrically similar structural designs of the device, a fixed spreading rate, defined by the ratio of the amount of fine sand to be discharged to the amount of fine sand in the raw material feed amount, is specified as a function of the fluidized bed height in the form of a calibration curve as a machine-specific parameter, and from the calibration
- a first process step is first of all to use this fluidized bed for classification in addition to the sorting effect of the fluidized bed set in the container, and to set a grain size between a fine sand fraction and a fine sand fraction to be discharged via the overflow; While the fine sand fraction is to remain completely in the product discharge, a certain part of the fine sand fraction present in the raw material feed should be introduced as a proportion corresponding to the predetermined concentration into the sand product quantity to be discharged over the bottom of the container, depending on the sand product quantity, the proportion exceeding that Fine sand is to be removed via the overflow.
- the method according to the invention takes advantage of the surprisingly recognized effect that the fluidized bed not only adjusts a particle size per se is possible, but that depending on the other structural conditions of the chamber design, a quantitative distribution of the entire fine sand fraction over the layer height of the fluidized bed in the container can be adjusted.
- the spreading of fine sand can be specified as a machine-specific parameter in the form of a calibration, so that after determining the total proportion of fine sand in the raw material feed, the fluidized bed height to be adjusted with regard to the amount of fine sand to be applied together with the fine sand can be derived.
- this container results in only a single amount of sand product as a measurement variable and as the basis for the concentration required with regard to the fine sand fraction.
- the amount of sand product is made up of the partial amount withdrawn in the coarse sand area and the partial amount withdrawn from the fine sand area, the amount in the sand product amount fine sand fraction to be introduced is spread over the fine sand area; to this extent the sand product quantity is to be summarized from two part sizes.
- the invention provides that the proportion of fine sand in the raw material feed is determined as a starting value by sampling and carrying out a grain size analysis on the sample taken.
- knowing the proportion of fine sand in the raw material feed can then either directly determine the fluidized bed height as the setpoint and, in comparison with a measured actual value for the fluidized bed height, the measure of the required readjustment can be determined, or a set amount of readjustment for the fluidized bed height can be used The measured actual value of the fluidized bed height is approximated to the desired value corresponding to the required spreading distribution.
- the spreading distribution as a function of the measured quantities for the raw material feed and / or the sand product quantity and / or the fine sand quantity applied via the overflow and the fluidized bed height as the desired value is derived as a function of the spreading distribution, it being possible for the mass flows to be measured preferably by means of switched-on belt scales.
- the size of the separating grain between the fine sand fraction and the fine sand fraction is 0.25 mm.
- FIG. 3 shows the sequence diagram according to FIG. 2 for an alternative setting of the fluidized bed height
- FIG. 5 shows a schematic representation of the assignment of the mass balance in a device designed with a single-chamber container
- FIG. 6 shows the sequence diagram according to FIG. 2 when applied to the device shown in FIG. 5.
- FIG. 1 partially shows the device described in detail in EP 0 508 335 A2; in this respect reference is made to EP 0 508 335 A2 with regard to the operation of the device.
- a mass flow m A flows through a feed arrangement 10 and into a coarse sand space 11, from which a coarse sand quantity VO QQ is removed via a discharge 12.
- the fine sand and ultra-fine components pass through the overflow 13 into the fine sand space 14, in which the fluidized bed 15 is present with a fluidized bed height h PS .
- the fine sand flow m FS is withdrawn via the discharge 16, while the fine sand constituents separated, for example, with a cut of 0.25 mm are discharged as a flow m F gg over the overflow 17.
- the corresponding solid mass balance is thus in the device
- a fine sand concentration in the amount of sand product is specified by the user of the device required, which results from the ratio of Fine sand proportion m ⁇ p r in the product to the total sand product quantity results in:
- the total fine sand fraction m ⁇ A contained in the raw material feed is to be divided into the fine sand amount m.-p j contained in the sand product amount mp r - and the fine sand amount ⁇ n F to be removed via the overflow 17 (FIG. 1).
- This fine grain fraction m F g S can also be defined as a loss of fine grain in the amount of sand product, and there is a dimensionless loss factor with
- V m FSS TM ⁇ A
- the method includes, as a method specification, the knowledge that the aforementioned loss factor V, that is to say corresponding to the fine sand quantity m F gg discharged via the overflow 17, can be determined as a machine parameter as a function of the bed height h FS of the fluidized bed 15 and then in the form of a calibration curve for machines can be specified with a comparable configuration.
- This dependency of the loss factor V on the fluidized bed height h FS can be represented in the form of a curve which is identified in the flow diagrams according to FIGS. 2 to 4 with the reference symbol 18.
- This calibration curve can be used for all machines with geometric similarity and therefore does not have to be for every machine individual machines can be determined in which the geometry and dimensions of the respective chambers are enlarged or reduced by a scaling factor.
- the flow rate is determined in the Rohmaterialaufgäbe m A over a belt scale 19, further be drawn through the sampler 20 samples, in a suitable device 21, the grain size distribution of Rohmaterialaufgäbe in a cut of 0, 25 mm is determined so that the total amount of fine sand in the raw material feed m ⁇ A with a grain size smaller than 0.25 mm is known.
- An actual value for the loss factor V can be determined with the measured actual value for the layer height h F g, the target value for the loss factor being calculable on the basis of the predetermined target concentration.
- the setpoint for the loss factor is to determine the target value for the layer height h FS , so that there is a ⁇ h FS between the actual value and the target value.
- the actual value for the layer height can then be adjusted accordingly with this ⁇ h FS .
- the procedure shown in FIG. 3 is based in the same way on setpoints or actual values for the concentration C, a fixed ⁇ h FS being specified in steps, which means that the setpoint for the fluidized bed height h FS is approximated in a corresponding multiple comparison Fine sand room 14 can be determined.
- FIG. 4 shows an alternative for the method according to the invention, in which it is possible to dispense with sampling and grain size determination;
- the bed height control of the fluidized bed is possible solely via the quantity detection, two influencing variables of the available flow rates being measured via belt scales 19;
- the flow chart according to FIG. 4 contains three possible exemplary embodiments with different combinations of two of the three possible influencing variables.
- FIG. 5 shows the mass ratios in a device with a cylindrical single-chamber container in which the coarse sand space 11 and the fine sand space 14 are combined in one chamber, in the lower region of which the fluidized bed 15 is present with a fluidized bed height h F g.
- the amount of sand product mp r containing the coarse sand fraction and the fine sand fraction is drawn off via the hood 12 formed at the bottom of the container.
- FIG. 6 shows a representation corresponding to FIG. 2 for the situation that arises in a single-chamber container according to FIG. 5, the relationships given in FIG. 2 not changing between the individual influencing variables, because only the sand product quantity m Pr is included as a single variable, and this amount of sand product is immediately available in a single-chamber container as a single product stream from the trigger 12.
Landscapes
- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19630085A DE19630085C2 (de) | 1996-07-26 | 1996-07-26 | Verfahren zur Steuerung einer Sortier- und Klassiervorrichtung für Sand und Kies |
DE19630085 | 1996-07-26 | ||
PCT/DE1997/001568 WO1998004353A1 (de) | 1996-07-26 | 1997-07-19 | Verfahren zur steuerung einer sortier- und klassiervorrichtung für sand und kies |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0921860A1 true EP0921860A1 (de) | 1999-06-16 |
EP0921860B1 EP0921860B1 (de) | 2001-09-19 |
Family
ID=7800851
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97935480A Expired - Lifetime EP0921860B1 (de) | 1996-07-26 | 1997-07-19 | Verfahren zur steuerung einer sortier- und klassiervorrichtung für sand und kies |
Country Status (7)
Country | Link |
---|---|
US (1) | US6142311A (de) |
EP (1) | EP0921860B1 (de) |
AU (1) | AU3846897A (de) |
DE (2) | DE19630085C2 (de) |
PL (1) | PL185287B1 (de) |
WO (1) | WO1998004353A1 (de) |
ZA (1) | ZA976636B (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6889842B2 (en) | 2002-03-26 | 2005-05-10 | Lewis M. Carter Manufacturing Co. | Apparatus and method for dry beneficiation of coal |
US20140262968A1 (en) | 2013-03-15 | 2014-09-18 | Fritz Enterprises, Inc. | System and method for recovery of valuable constituents from steel-making slag fines |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2755681A1 (de) * | 1977-12-14 | 1979-06-28 | Kloeckner Humboldt Deutz Ag | Verfahren zur regelung einer anlage zur gewinnung von wertstoffen aus erzen oder anderen mineralen |
US4533464A (en) * | 1983-05-25 | 1985-08-06 | Linatex Corporation Of America | Teeter bed zone density control device and method |
DE59209400D1 (de) * | 1991-04-09 | 1998-08-13 | Allmineral Aufbereitungstech | Vorrichtung zum Abscheiden von Leichtstoffen aus Sand und Kies |
DE4118020A1 (de) * | 1991-06-01 | 1992-12-03 | Schauenburg Masch | Verfahren zum abscheiden spezifisch leichter bestandteile aus einer truebe durch aufstromsortierung und messvorrichtung dazu |
-
1996
- 1996-07-26 DE DE19630085A patent/DE19630085C2/de not_active Expired - Fee Related
-
1997
- 1997-07-19 WO PCT/DE1997/001568 patent/WO1998004353A1/de active IP Right Grant
- 1997-07-19 EP EP97935480A patent/EP0921860B1/de not_active Expired - Lifetime
- 1997-07-19 DE DE59704686T patent/DE59704686D1/de not_active Expired - Fee Related
- 1997-07-19 US US09/230,596 patent/US6142311A/en not_active Expired - Lifetime
- 1997-07-19 AU AU38468/97A patent/AU3846897A/en not_active Abandoned
- 1997-07-19 PL PL97331485A patent/PL185287B1/pl not_active IP Right Cessation
- 1997-07-25 ZA ZA976636A patent/ZA976636B/xx unknown
Non-Patent Citations (1)
Title |
---|
See references of WO9804353A1 * |
Also Published As
Publication number | Publication date |
---|---|
ZA976636B (en) | 1998-09-01 |
PL331485A1 (en) | 1999-07-19 |
US6142311A (en) | 2000-11-07 |
DE59704686D1 (de) | 2001-10-25 |
DE19630085C2 (de) | 2001-03-08 |
EP0921860B1 (de) | 2001-09-19 |
WO1998004353A1 (de) | 1998-02-05 |
DE19630085A1 (de) | 1998-01-29 |
PL185287B1 (pl) | 2003-04-30 |
AU3846897A (en) | 1998-02-20 |
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