EP0461356A1 - Procédé et dispositif de traitement de sable humide en sable sec - Google Patents

Procédé et dispositif de traitement de sable humide en sable sec Download PDF

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Publication number
EP0461356A1
EP0461356A1 EP91105212A EP91105212A EP0461356A1 EP 0461356 A1 EP0461356 A1 EP 0461356A1 EP 91105212 A EP91105212 A EP 91105212A EP 91105212 A EP91105212 A EP 91105212A EP 0461356 A1 EP0461356 A1 EP 0461356A1
Authority
EP
European Patent Office
Prior art keywords
sand
cooling
dryer
drying drum
dry sand
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.)
Withdrawn
Application number
EP91105212A
Other languages
German (de)
English (en)
Inventor
Hans Joachim Dipl.-Ing. Siech
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.)
Quick-Mix Gruppe & Co KG GmbH
Original Assignee
Quick-Mix Gruppe & Co KG GmbH
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 Quick-Mix Gruppe & Co KG GmbH filed Critical Quick-Mix Gruppe & Co KG GmbH
Publication of EP0461356A1 publication Critical patent/EP0461356A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/18—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact
    • F26B3/20—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact the heat source being a heated surface, e.g. a moving belt or conveyor
    • F26B3/205—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact the heat source being a heated surface, e.g. a moving belt or conveyor the materials to be dried covering or being mixed with heated inert particles which may be recycled

Definitions

  • the invention relates to a method for processing moist sand to dry sand according to the preamble of claim 1 and a device for carrying out the method according to the preamble of claim 7.
  • sand is used in many areas of application, such as plaster beds, drainage or concrete mixes, as it results from deposit mining or from an interim storage facility, unprepared sand is not suitable for special applications, especially one with a high, unknown or fluctuating moisture content usable.
  • a common drying method is, for example carried out in a drying drum in continuous operation, the damp sand passing through the drying drum in countercurrent to hot gas (air) while the drum is rotating.
  • the hot dry sand leaves the dryer and is passed on for further processing, for example in a screening plant or mixing plant.
  • the sand cools down again.
  • the cooling achieved for example, until a ready-made mortar is assembled or even delivered to a construction site and also processed, may be insufficient.
  • temperatures above 50 ° C not only is the handling impaired, but often the specified quality of the mortar. This is also unacceptable if the temperature-related influences are only temporary - as is usually the case.
  • the drying process requires thermal energy that is subsequently not used and is even harmful.
  • the invention has for its object to provide a method and a device for processing wet sand to dry sand that achieve an effective, controlled and not dependent on long-term storage cooling of the sand with a limited amount of equipment and costs and thereby better the heating energy applied use.
  • the invention creates in a particularly simple way the possibility of increasing the efficiency of the treatment from wet sand to dry sand with a limited expenditure on equipment, an insignificantly expanded space requirement and low cost, and of making better use of the heating energy applied.
  • the dry sand is immediately after a portion of wet sand is added to the exit of a hot dryer during cooling, so that there is an overlaid cooling and drying process by the wet sand added and the hot dry sand being in close contact, finely distributed, aerated, and thus the dry sand temperature to less than 50 ° C drops.
  • the low complexity and the speed of carrying out the process represent particular advantages.
  • there is the advantage that the process can be carried out in a limited space. This means that dry sand is available as a process product, which both falls below the specified maximum moisture content and also complies with the specified limit values with regard to the temperature and thus the quality characteristics in mortar mixtures and the like. Similar products guaranteed.
  • the device according to the invention comprises one or more cooling driers which can be fed continuously via a distributor, in which the hot dry sand and the damp sand are mixed with one another in a second drying stage.
  • this cooling dryer uses the energy of the hot sand to dry the damp sand by increasing the surface area by distributing the sand mixture over the entire horizontal cross-section of the cooling dryer and by increasing the evaporation area and the resulting vapors by means of advantageous forced ventilation above the Cooling dryer is sucked a dry sand passing through a dwell time.
  • the entire device can advantageously be installed in a space-saving manner in the drying cycle for processing wet sand.
  • FIG. 1 The basic diagram shown in FIG. 1 for carrying out the process assumes that moist sand 2 is conveyed from a storage 1 via a first conveyor 3 into a hot dryer designed as a drying drum 4.
  • the amount of damp sand 2 is metered via a slide 5, which reacts with a moisture meter 6 to fluctuating moisture values.
  • a drive 8 sets the drying drum 4 in rotary motion and thus circulates the damp sand 2.
  • the moisture of the sand in the form of water vapor is sucked off as vapors 18 via a trigger 17.
  • dry sand 9 leaves the drying drum 4 via an outlet 10.
  • a temperature sensor 11 detects the temperature of the dry sand 9, which is, for example, in a range from approximately 100 ° to 120 ° C.
  • a defined amount of moist sand 2 is continuously added to the dry sand 9 via a controller 12 with a second conveyor 13.
  • this proportion can be approximately 10% to 50% of the amount of dry sand 9.
  • a sand mixture 14, in the example shown in an advantageous embodiment under the action of gravity, thus reaches a distribution box 15 into a cooling dryer 16.
  • This cooling dryer 16 has a cylindrical basic shape and is designed in a vertical arrangement for a fill level 19 which is registered by means of a fill level indicator 20.
  • a control mechanism (not shown) switches the distribution box 15 or opens the outlet 21 as a function of this measured variable.
  • the sand mixture 14 is finely distributed by means of an agitator 22 with a height-adjustable or at a certain height remaining stirring element 23 over the circular area of the cross section of the cooling dryer 16, in which the stirring element 23 has a higher distribution Speed revolves.
  • the hot grain constituents of the dry sand 9 and the proportions of the moist sand 2 are brought into close contact with one another, the adhering water evaporates and is also extracted as vapors 24 via the trigger 17.
  • a greater yield of dry sand 27 is achieved with simple means, which advantageously has simultaneously cooled to a low temperature required for subsequent processing stages.
  • the dry sand 27 is given a dwell time in the cooling dryer 16.
  • an outlet 21 on the cooling dryer 16 is closed and there is a feed to the fill level 19. Then the distribution box 15 is switched over and a further cooling dryer 16 is loaded.
  • the physico-chemical separation process of the moisture from the sand mixture 14 can be intensified or accelerated by blowing air into the lower region 25 of the cooling dryer 16 via a blower 26.
  • a detection of the temperature of the dry sand 27 in the cooling dryer the possibility is created to maintain certain controllable limit values for the dwell time in the cooling dryer 16 and then the removal of the dry sand 27 takes place via the outlet 21 and a discharge belt 28 for further transport to a screening plant.
  • the vertical arrangement of the cooling driers 16 also enables a simple expansion of this drying system, in that two further cooling driers 36 can be assigned to the cooling driers 16 according to FIGS Dry sand 27 in the cooling dryers 16, 36 or a smaller size of the cooling dryer 16, 36 can be realized.
  • FIG. 4 and 5 show two cooling dryers 29 with a horizontal axis of rotation and with a distribution box 15 located above them, the same reference numerals being used wherever there is agreement with FIG. 1.
  • the sand mixture 14 is moved horizontally through the cooling dryer 29 with an agitator 30 and with stirring elements 31 and at the same time is traversed by an air flow between the fan inlet opening 32 and the vapor outlet 33. A continuous throughput of dry sand 27 is thus present at the outlet 34.
  • the regulation of the loading of the horizontal cooling dryer 29 in this horizontal embodiment is also carried out analogously to FIG. 1 (not shown).

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
EP91105212A 1990-06-09 1991-04-02 Procédé et dispositif de traitement de sable humide en sable sec Withdrawn EP0461356A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4018521 1990-06-09
DE19904018521 DE4018521C2 (de) 1990-06-09 1990-06-09 Verfahren und Einrichtung zur Aufbereitung von Feuchtsand zu Trockensand

Publications (1)

Publication Number Publication Date
EP0461356A1 true EP0461356A1 (fr) 1991-12-18

Family

ID=6408115

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91105212A Withdrawn EP0461356A1 (fr) 1990-06-09 1991-04-02 Procédé et dispositif de traitement de sable humide en sable sec

Country Status (2)

Country Link
EP (1) EP0461356A1 (fr)
DE (1) DE4018521C2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4436840C1 (de) * 1994-10-14 1995-12-07 Ladwein Rosemarie Verfahren und Vorrichtung zum Aufbereiten von feinkörnigem Schüttgut

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE177798C (fr) *
FR1022676A (fr) * 1950-07-31 1953-03-09 Procédé et installation de conditionnement ou de séchage applicable aux céréales et aux matières analogues
DE1028095B (de) * 1952-09-13 1958-04-17 Metallgesellschaft Ag Verfahren zum Erhitzen von feinkoernigen, insbesondere wasserhaltigen Stoffen mittels fester Waermetraeger
CH364456A (de) * 1959-01-20 1962-09-15 Inwag Ind Waerme Ag Trocknungsanlage für Sand- und Kiesmaterial
GB1387742A (en) * 1972-01-17 1975-03-19 Avril A C Apparatus for and method of drying and blending materials
US4750913A (en) * 1986-12-19 1988-06-14 Shell Mining Company Cooling of dried coal

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE177798C (fr) *
FR1022676A (fr) * 1950-07-31 1953-03-09 Procédé et installation de conditionnement ou de séchage applicable aux céréales et aux matières analogues
DE1028095B (de) * 1952-09-13 1958-04-17 Metallgesellschaft Ag Verfahren zum Erhitzen von feinkoernigen, insbesondere wasserhaltigen Stoffen mittels fester Waermetraeger
CH364456A (de) * 1959-01-20 1962-09-15 Inwag Ind Waerme Ag Trocknungsanlage für Sand- und Kiesmaterial
GB1387742A (en) * 1972-01-17 1975-03-19 Avril A C Apparatus for and method of drying and blending materials
US4750913A (en) * 1986-12-19 1988-06-14 Shell Mining Company Cooling of dried coal

Also Published As

Publication number Publication date
DE4018521A1 (de) 1991-12-12
DE4018521C2 (de) 1995-07-20

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