EP0445085B1 - Procedure for the washing and composition control of abrasive pulps used in the cutting of granite and similar stones and relative apparatus - Google Patents

Procedure for the washing and composition control of abrasive pulps used in the cutting of granite and similar stones and relative apparatus Download PDF

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Publication number
EP0445085B1
EP0445085B1 EP91830061A EP91830061A EP0445085B1 EP 0445085 B1 EP0445085 B1 EP 0445085B1 EP 91830061 A EP91830061 A EP 91830061A EP 91830061 A EP91830061 A EP 91830061A EP 0445085 B1 EP0445085 B1 EP 0445085B1
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EP
European Patent Office
Prior art keywords
grit
pulp
granulometry
fraction
abrasive
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 - Lifetime
Application number
EP91830061A
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German (de)
English (en)
French (fr)
Other versions
EP0445085A2 (en
EP0445085A3 (en
Inventor
Giorgio Dinelli
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.)
GIORGINI MAGGI Srl
Original Assignee
GIORGINI MAGGI Srl
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Publication date
Application filed by GIORGINI MAGGI Srl filed Critical GIORGINI MAGGI Srl
Publication of EP0445085A2 publication Critical patent/EP0445085A2/en
Publication of EP0445085A3 publication Critical patent/EP0445085A3/en
Application granted granted Critical
Publication of EP0445085B1 publication Critical patent/EP0445085B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/025—Use, recovery or regeneration of abrasive mediums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material

Definitions

  • the present invention relates to a process for the washing and composition control of abrasive pulps used in the cutting of granite and similar stones.
  • the invention also relates to an apparatus for the practical execution of this process.
  • abrasive mixtures of essentially an iron grit base are used which, in the form of a water suspension, are continuously recirculated in the grooves made in the block by the alternative movement of the blades.
  • the abrasive action of these mixtures substained by the movement of the blades progressively cuts the block (cf. US-A-4 762 422).
  • the abrasive pulp in circulation becomes progressively enriched with dust from cut material and consumed iron, thus of a granulometry too fine to be effective in the cutting operation.
  • the granulometry of the fresh metallic grit is usually about 1 mm, while the metallic dust of finer granulometry than about 0.3 mm can be considered exhausted.
  • the object of this invention is to provide a process for the washing and composition control of abrasive pulps used in the cutting of granite and similar stones which prevents the inconveniences related to similar known processes.
  • a particular object of this invention is to provide a process of the above mentioned type which allows for the measurement of the specific weight of the abrasive pulp, the quantities of metallic grit with granulometry larger or finer than a predetermined value present per litre of pulp, as well as the automatic control of pulp washing operations and restoration of fresh metallic grit for obtaining optimum abrasive mixtures for any type of granite on the basis of real grit consumption rather than assumed values.
  • the process for the washing and composition control of abrasive pulps is characterized by the fact that first a predetermined volume of said pulp is weighed and then submitted to sedimentation in a liquid phase in order to collect the solid fraction of larger granulometry. Said fraction is then weighed and returned to the collection tank of the pulp in circulation. From the weight and volume data on the pulp and from the weight of said fraction of grit of larger granulometry, the specific weight of the pulp and actual concentration of said grit in the circulated pulp are determined. From comparison to corresponding values of specific weight and to concentrations considered optimum, the quantity of grit to restore and the frequency of washings are established.
  • the calculation of the specific weight, the concentration and the quantity to restore are conducted by a computer processor which also controls the correct succession of the various operative phases and the operation of the metering equipment of the metallic grit which is restored from time to time, as well as the frequency of the washings.
  • the fraction of finer granulometry is also collected, and weighed in order to calculate the concentration of the circulating pulp thus providing for the disposal of the entire volume collected or of a portion of it while recirculating the remaining portion.
  • fractionated sedimentation of the volume of pulp derived from the pulp circulation system can be accomplished in a vertical tubular water-containing container.
  • a predetermined volume containing either one or the other said fractions is weighed.
  • the reliability of the process is guaranteed by the fact that, in order to separate the different components of the mixture (in particular large grit from fine grit), recourse is made only to the force of gravity and to the different resistances to motion in a fluid opposed by particles of different granulometry. For this reason, at first approximation, with regard to the metallic grit, the speed of sedimentation is proportional to the diameter of the particles, while with regard to the granite dusts, having a specific weight 3.54 times lower than that of iron, they behave, with respect to _sedimentation, approximately like iron particles of a diameter as many times smaller. This guarantees that even the granite dust of larger granulometry (for example 1 mm in diameter) can be effectively separated from the metallic grit.
  • Another object of this invention is to provide an apparatus for the washing and composition control of abrasive pulps used in cutting granite and similar stones functioning according to the process referred to above.
  • Such apparatus comprises a tubular settler for the separation of the fraction of metallic grit with a granulometry larger than a predetermined value from that of finer granulometry than said value and from granite dusts, fit to be filled with washing liquid and having inlet and discharge sections communicating interceptably respectively with a first container for the collection of a predetermined volume of abrasive circulating pulp and a second container for the collection of the sediment deposited on the bottom of said settler.
  • the invention also provides for weighing means associated with the first and second containers for weighing respectively the volume of pulp removed and the sediment collected, and computer processor means for providing the specific weight of the pulp and the concentration of the fraction of larger granulometry in said pulp providing from weight data and for the control of the operative sequence, the control of restoration of fresh metallic grit and the frequency of the washings.
  • Intermediate tank 6 communicates by way of a motorized interception valve 7, with a second collection container 8 of the hopper type, the bottom of which, intercepted by a motorized valve 9, can be alternatively put in communication with a duct 10 confluent in the collection well of the abrasive pulp of the circulation circuit, or with a duct 11 connected to disposal facilities or mud treatment plant.
  • First container 2, second container 8 and intermediate tank 6 are aligned along the vertical axis of tubular settler 4.
  • First collection container 2 is supplied by a collector 12 intercepted by a motorized valve 13, derived from the abrasive pulp circulation circuit. Also, first container 2 as well as second container 8, are mounted on respective loading cells 14 and 15 for the weighing of a predetermined volume of abrasive pulp collected in container 2 and of sediment collected in container 8.
  • the apparatus is connected to a line 16 for the supply of washing liquid, in particular water, and connections to first container 2, settler 4, intermediate tank 6 and second container 8 intercepted respectively by motorized valves 17, 18, 19 and 20 are provided for.
  • a duct 21 is provided on which a motorized valve 22 is mounted to make the liquid containing the finer particles flow to disposal facilities or to the mud treatment plant.
  • Computer processor 23 controls the operating cycle of the apparatus according to this invention sending command signals to the various motorized valves and receiving weight data from loading cells 14 and 15.
  • the opening of valve 13 commands the influx of the abrasive pulp from collector 12 into first collection tank 2, the level of which is controlled by controller 24.
  • controller 24 When a predetermined level is reached in container 2, the value of which is read and sent to processor 23, valve 13 is closed and, through loading cell 14, the weight of the content of container 2 is taken and sent to processor 23 for the calculation of the specific weight of the abrasive pulp collected. Water is then allowed to flow into settler 4 by opening valve 18 to a level predetermined and checked by level controller 25 while valves 5 and 7 are respectively open and closed.
  • valve 3 The opening of valve 3 is then commanded which causes the pulp contained in container 2 to precipitate in the water contained in settler 4, where the large metallic grit separates rapidly from the finer particles collecting in intermediate tank 6.
  • valve 5 A predetermined time after the opening of valve 3, valve 5 is closed in order to prevent the finer and lighter particles from ending up in intermediate tank 6.
  • valve 7 makes the grit fall from tank 6 to second collection container 8 where water is also sent by opening of valve 20 until a predetermined volume is reached, under the level control of controller 26. This volume is weighed by loading cell 15 and the datum is sent to processor 23 for calculation of the concentration (g/l) of the large size grit in the abrasive pulp.
  • the opening of valve 9 is operated to return the weighed grit to the circulating pulp collection basin through duct 10.
  • valve 22 is also opened to make the water suspension present in settler 4 flow through duct 21, while the fine metallic grit is collected on the bottom of settler 4.
  • Newly opening valve 5, the fine size grit is transferred to intermediate tank 6 and from here, opening valve 7, in second container 8, which is submitted to weighing in the same way used for large size grit, by loading cell 15, and the measured weight is sent to to processor 23 for calculation of the concentration in the pulp.
  • valves 17, 18, 19 and 20 provide for the quick washing of the containers and the ducts.
  • the washing water is sent to the disposal facilities through duct 11.
  • the actual concentration values of large size grit and fine size grit thus measured are compared with respective,previously memorized values considered optimum and, as a function of the results of that comparison carried out by computer processor 23, said processor controls the fresh metallic grit metering equipment D (not shown) for the restoration to the circulating pulp, while, as for the fine grit, it controls its return to the circulating pulp collection basin by way of duct 10 or rather its removal from the cycle by way of duct 11.
  • FIG 2 a simplified possible variation of the apparatus according to this invention in which neither the possibility of measuring directly the concentration of the fine metallic grit, nor its possible recirculation is provided for.
  • the large metallic grit which collects on the bottom of settler 4 is discharged directly into second container 8 by opening valve 5 and is weighed according to the already defined modalities, after having emptied from settler 4 through drainage duct 21 the suspension containing fine grit and granite dusts.
  • the desirable separation of the large grit is obtained by regulating the time between the inlet of the mixture into settler 4 and the opening of valve 22.
  • a practical example of the execution of the process according to this invention provided for the use of a tubular settler of a diameter 0,3 m and height 2,5 m. From the circuit of the abrasive pulp a fraction of 40 l. was drawn the specific weight of which, following weighing in the first container 2 with loading cell 14, resulted 1.650 g/l. Following weighing in second container 8, the presence of 2.400 g of large metallic grit, of nominal granulometry larger than 0,3 mm, and 4.000 g of fine metallic grit, that is of nominal granulometry of less than 0,3 mm, were revealed in the pulp fraction.
  • the concentration of large size grit therefore resulted 60 g/l in the circulating pulp, a value considered acceptable for the cutting of granite, while that of fine grit resulted 100 g/l.
  • concentration of large size grit resulted 60 g/l in the circulating pulp, a value considered acceptable for the cutting of granite, while that of fine grit resulted 100 g/l.
  • a loss of about 10% of large grit in the fine grit and about an equal presence of fine grit in the large grit were revealed.
  • a yield of 90% separation is considered good, a yield which can further be improved optimizing the operative parameters of the process.
  • the weight of both fine and large size grit fractions may also be obtained, instead of by loading cells, in an indirect way by reading the level of the grit in the container 8 or by measuring the variation of the intensity of a magnetic field that is proportional to the mass of the metallic grit.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Paper (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
EP91830061A 1990-02-28 1991-02-20 Procedure for the washing and composition control of abrasive pulps used in the cutting of granite and similar stones and relative apparatus Expired - Lifetime EP0445085B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT9326A IT1238882B (it) 1990-02-28 1990-02-28 Procedimento per il lavaggio ed il controllo della composizione di torbide abrasive usate nel taglio di graniti e pietre similari e relativa apparecchiatura.
IT932690 1990-02-28

Publications (3)

Publication Number Publication Date
EP0445085A2 EP0445085A2 (en) 1991-09-04
EP0445085A3 EP0445085A3 (en) 1992-10-07
EP0445085B1 true EP0445085B1 (en) 1996-04-10

Family

ID=11128487

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91830061A Expired - Lifetime EP0445085B1 (en) 1990-02-28 1991-02-20 Procedure for the washing and composition control of abrasive pulps used in the cutting of granite and similar stones and relative apparatus

Country Status (7)

Country Link
EP (1) EP0445085B1 (pt)
JP (1) JPH05412A (pt)
BR (1) BR9100797A (pt)
DE (1) DE69118571T2 (pt)
ES (1) ES2088478T3 (pt)
IT (1) IT1238882B (pt)
PT (1) PT96906B (pt)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2140353B1 (es) * 1998-07-23 2000-08-16 Gomez Luis Castro Metodo de aserrar granitos.
ES2199064B1 (es) * 2002-07-01 2005-06-01 Luis Castro Gomez Aserrado de piedras sin ruido agudo.
ITVI20030113A1 (it) * 2003-06-10 2004-12-11 Marmi Zenatelli Sas Procedimento per il trattamento di correzione della
ES2246168B1 (es) * 2004-07-27 2007-03-16 Luis Castro Gomez Aserrado de granito mejorado.
IT1394117B1 (it) * 2009-05-14 2012-05-25 Valentinotti Impianto di pallinatura/sabbiatura controllata in continuo e relativo metodo
IT1397126B1 (it) * 2009-10-13 2013-01-04 Fil Tec S R L Sistema e metodo per filtrare l'acqua reflua derivante dal taglio dei blocchi e della lucidatura dei marmi, graniti e similari.
WO2012126883A1 (en) * 2011-03-18 2012-09-27 Meyer Burger Ag Cutting fluid cleaning arrangement for a wire saw, wire saw arrangements and use of the wire saw arrangement
DE102016223190B3 (de) * 2016-10-04 2017-10-19 Eisenwerk Würth GmbH Verfahren und Vorrichtung zur Ermittlung eines Betriebszustands einer Strahlanlage

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2994314A (en) * 1958-08-22 1961-08-01 Ty Sa Man Machine Company Stone cutting apparatus
FR1263257A (fr) * 1960-04-21 1961-06-09 Saint Gobain Perfectionnement au polissage du verre
IT1191597B (it) * 1986-03-14 1988-03-23 Luca Toncelli Dispositivo per il controllo automatico della densita' e della viscosita' della miscela abrasiva e della quantita' di granaglia metallica usata nella segagione dei graniti o pietre dure
DE8910186U1 (de) * 1989-08-12 1989-12-07 Scheible Versorgungsanlagen GmbH, 7340 Geislingen Vorrichtung zum Entsorgen von flüssigen Medien mit Produktionsrückständen

Also Published As

Publication number Publication date
IT1238882B (it) 1993-09-04
ES2088478T3 (es) 1996-08-16
IT9009326A1 (it) 1991-08-28
IT9009326A0 (it) 1990-02-28
JPH05412A (ja) 1993-01-08
EP0445085A2 (en) 1991-09-04
DE69118571D1 (de) 1996-05-15
PT96906A (pt) 1993-01-29
DE69118571T2 (de) 1996-11-28
PT96906B (pt) 1998-09-30
EP0445085A3 (en) 1992-10-07
BR9100797A (pt) 1991-11-05

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