WO2008015596A2 - Method and plant for rendering inert a loose mixture consisting of a hardenable resin and aggregates - Google Patents

Method and plant for rendering inert a loose mixture consisting of a hardenable resin and aggregates Download PDF

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Publication number
WO2008015596A2
WO2008015596A2 PCT/IB2007/052750 IB2007052750W WO2008015596A2 WO 2008015596 A2 WO2008015596 A2 WO 2008015596A2 IB 2007052750 W IB2007052750 W IB 2007052750W WO 2008015596 A2 WO2008015596 A2 WO 2008015596A2
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WO
WIPO (PCT)
Prior art keywords
mix
station
resin
heating
plant
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.)
Ceased
Application number
PCT/IB2007/052750
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French (fr)
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WO2008015596A3 (en
WO2008015596A8 (en
Inventor
Dario Toncelli
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Individual
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Individual
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 Individual filed Critical Individual
Priority to US12/376,239 priority Critical patent/US8030441B2/en
Priority to EP07825915A priority patent/EP2046563B1/en
Priority to KR1020097004574A priority patent/KR101395998B1/en
Priority to AT07825915T priority patent/ATE524302T1/en
Priority to CA2659810A priority patent/CA2659810C/en
Publication of WO2008015596A2 publication Critical patent/WO2008015596A2/en
Publication of WO2008015596A3 publication Critical patent/WO2008015596A3/en
Priority to IL196862A priority patent/IL196862A/en
Anticipated expiration legal-status Critical
Publication of WO2008015596A8 publication Critical patent/WO2008015596A8/en
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
    • B29C67/242—Moulding mineral aggregates bonded with resin, e.g. resin concrete
    • B29C67/243—Moulding mineral aggregates bonded with resin, e.g. resin concrete for making articles of definite length
    • B29C67/244—Moulding mineral aggregates bonded with resin, e.g. resin concrete for making articles of definite length by vibrating the composition before or during moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/20—Agglomeration, binding or encapsulation of solid waste
    • B09B3/21—Agglomeration, binding or encapsulation of solid waste using organic binders or matrix
    • B09B3/24—Binders with plastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material

Definitions

  • the present invention relates to a method and the related plant for rendering inert a loose mixture containing a hardenable resin with an organic solvent and solid inert materials.
  • One industrial application which envisages the use of hardenable resins relates to the manufacture of conglomerate stone articles.
  • An example consists in the articles which are produced using the so-called "Bretonstone technology" where an initial mix, formed of particles of stone, ceramic or stone-like aggregate with a controlled particle size, a fine filler and a binder, is deposited on a temporary support, subjected to a compaction step by means of vacuum vibrocompression and then transferred for the hardening step which is performed in the presence of a catalyst when the binder consists of a resin.
  • the binder products used are preferably polyester resins, diluted with a reactive monomer such as styrene, which participates actively in the catalytic hardening step. For this reason the initial mix usually also contains the catalyst and, where necessary, a catalysis accelerator/initiator.
  • polyester resin is a synthesis product derived from petroleum, the problems of which as regards its impact on the environment are well-known.
  • polyester resin dissolved in the styrene within the mix is in the active state and therefore it is of a potentially polluting nature.
  • the main object of the invention is therefore to eliminate the risks of pollution by resins which are still active since they are dissolved in a solvent, for example contained in a mix which cannot be used, by rendering them inactive or inert.
  • the inert material obtained with the method according to the invention may be disposed of also in ordinary waste tips without the need for special measures or treatment in external plants.
  • the plant according to the present invention which is suitable for implementing the method defined above, is characterized in that it comprises an oven in which the mixture to be rendered inert, in particular the initial mix indicated above, preferably in the form of small heaps or mounds, undergoes heating using as a heat source a generator of radio frequency waves, namely waves which have a frequency not greater than 300 MHz.
  • FIG. 1 is a cross-sectional side view of the plant for rendering material inert according to the invention
  • Fig. 2 is a top plan view of the plant according to Fig. 1.
  • the method according to the present invention is advantageously applied to the residual mix and to the cleaning waste following a relatively prolonged stoppage of the production plant.
  • the uncompacted waste is thus introduced inside an oven which uses as a heat source a generator of radiofrequency waves, i.e. at a frequency of less than 300 MHz, and is heated to temperatures of 100-120 0 C and kept at this temperature for a period of 15-20 minutes.
  • a generator of radiofrequency waves i.e. at a frequency of less than 300 MHz
  • the polyester resin contained in the mix is thus catalysed, bonding all the styrene contained inside it.
  • the radiofrequency waves allow rapid heating internally of the soft mass of uncompacted mix, causing catalysis of the resin and combination of the monomer contained inside it.
  • the same result would not be obtained with other heat sources generally used in the industry; heating with hot air or with infrared rays would in fact result only in superficial heating of the granular mass and moreover cause rapid evaporation of the styrene, the absence of which would then make catalysis of the resin impossible.
  • the radiofrequency waves used have a frequency of less than 300 MHz (maximum limit) and preferably between 25 and 35 MHz.
  • the frequency is chosen so as to guarantee an optimum heating efficiency depending on the type of resin and aggregate with which the material of the mix is formed.
  • the polyester resin By means of heating with radiofrequency waves, the polyester resin is also rendered inert and therefore no longer polluting and the reactive styrene is also bonded to the resin and therefore loses its toxicity.
  • the plant for rendering material inert comprises, as shown in Figures 1 and 2, a station 11 for charging the mix to be rendered inert, a station 13 for heating said mix by means of a dielectric heating oven 18, and a station 14 for discharging the inert mix.
  • the charging station 11 has a hopper 16 containing the mix to be rendered inert, i.e. the residual mix and the cleaning waste.
  • This mix is broken up into small fragments by means of a lump-breaking device 15 of the known type with blades having two counter-rotating shafts and then conveyed by an extractor belt 17 onto conveying means 12, preferably of the belt type, of the heating station 13. In this way the mix is present in the form of a soft and loose mass.
  • the material to be treated in the form of lumps or mounds or in a fairly small-size mass, is charged onto the conveyor means 12, forming for example a layer with a thickness of - A -
  • the soft mass is charged onto the belt 12 in the form of small piles 19 which are about 10-20 cm high and spaced from each other by a few centimetres; in this way the catalysed mix leaving the oven 18 is in the form of hard and porous agglomerations having dimensions of a few tens of centimetres, which may be easily conveyed to the discharging station 14 or into a storage container.
  • said plant therefore comprises in succession: - a first station for preparing the mix by mixing a granulated material of predetermined particle size and a fine filler with an organic binder;
  • a fourth catalysis station comprising heating ovens for catalysis of the organic binder so as to obtain the final sheet
  • the inert material thus obtained may be transported to a normal waste tip without the need for special authorisation or, alternatively, may be used for different purposes.
  • the inert material may be used as a filling aggregate or foundation material in building work or, after being crushed to a suitable particle size, may be used as a filling aggregate for the preparation of concrete or other cement mortars.

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Fertilizers (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)
  • Sealing Material Composition (AREA)
  • Breeding Of Plants And Reproduction By Means Of Culturing (AREA)

Abstract

A loose mixture formed of one or more solid inert materials and a hardenable resin dissolved in an organic solvent, in particular the remainder of the initial mix used for the manufacture of conglomerate stone sheets, is rendered inert by means of dielectric heating at a frequency of less than 300 MHz. The invention also relates to the plant for implementing this method.

Description

"Method and plant for rendering inert a loose mixture consisting of a hardenable resin and aggregates"
Description
The present invention relates to a method and the related plant for rendering inert a loose mixture containing a hardenable resin with an organic solvent and solid inert materials.
There are numerous industrial applications which make use of mixtures containing hardenable resins dissolved in organic solvents.
One industrial application which envisages the use of hardenable resins relates to the manufacture of conglomerate stone articles. An example consists in the articles which are produced using the so-called "Bretonstone technology" where an initial mix, formed of particles of stone, ceramic or stone-like aggregate with a controlled particle size, a fine filler and a binder, is deposited on a temporary support, subjected to a compaction step by means of vacuum vibrocompression and then transferred for the hardening step which is performed in the presence of a catalyst when the binder consists of a resin. For a description of the aforementioned Bretonstone technology reference may be made, for example, to the following patents: IT-A-1, 181,570 relating to preparation of the initial mix, EP-A-0,786,325 and 1,027,205 relating to the use of organic binders.
The binder products used are preferably polyester resins, diluted with a reactive monomer such as styrene, which participates actively in the catalytic hardening step. For this reason the initial mix usually also contains the catalyst and, where necessary, a catalysis accelerator/initiator.
It must be pointed out firstly that polyester resin is a synthesis product derived from petroleum, the problems of which as regards its impact on the environment are well-known.
Moreover, the presence in the mix of the styrene monomer as a reactive solvent of the polyester resin gives rise to various environmental problems associated with its toxic nature and the danger of explosion because of its high volatility: sophisticated and costly plants for capturing and eliminating the styrene vapours are in fact necessary in order to comply with increasingly stringent regulations.
Even though individually the resin and solvent are problematic from an environmental point of view because of the risk of pollution, in the case of Bretonstone technology, the final product - in other words the conglomerate stone sheets or blocks - is totally inert since the resin is catalysed and hardened in a solid non-reactive state.
Management of the initial mix, however, is problematic: in fact, when plants which perform all the stages of production of the articles are used, during relatively long stoppages of the machines (for example from a previous evening to the following morning), the disadvantage is that a certain quantity of initial mix remains unused and, since it cannot be compacted and converted into the final product, must be disposed of. The uncompacted mix is a loose and soft granular mass.
In this latter case, however, the polyester resin dissolved in the styrene within the mix is in the active state and therefore it is of a potentially polluting nature.
A similar problem arises with the remainder of mix resulting from cleaning of the production line and in particular the equipment for preparing and distributing the mix onto the forming moulds; it may also be in the form of a granular and loose mass.
Is therefore required to dispose of the unused mix in special waste tips which are equipped to deal with the so-called toxic waste, with obvious management and disposal costs.
The main object of the invention is therefore to eliminate the risks of pollution by resins which are still active since they are dissolved in a solvent, for example contained in a mix which cannot be used, by rendering them inactive or inert.
These object is achieved by means of a method for rendering inert a loose and porous mix comprising a solid aggregate, a filler and said hardenable resin dissolved in an organic solvent, characterized in that said mix is subjected to a dielectric heating step.
With the method it is therefore possible to obtain a material which is totally inert and which, although it can no longer be used for the production of conglomerate articles, has the considerable advantage that it is not toxic and harmful from an environmental point of view. Since it no longer has toxic properties due to the resin in the active state and the styrene, the inert material obtained with the method according to the invention may be disposed of also in ordinary waste tips without the need for special measures or treatment in external plants.
In turn the plant according to the present invention, which is suitable for implementing the method defined above, is characterized in that it comprises an oven in which the mixture to be rendered inert, in particular the initial mix indicated above, preferably in the form of small heaps or mounds, undergoes heating using as a heat source a generator of radio frequency waves, namely waves which have a frequency not greater than 300 MHz.
The aspects and advantages of the present invention will emerge more clearly from the following detailed description, relating to the Bretonstone technology and provided purely by way of a non-limiting example, with reference to the accompanying drawings in which:
- Fig. 1 is a cross-sectional side view of the plant for rendering material inert according to the invention;
- Fig. 2 is a top plan view of the plant according to Fig. 1. In the case of resins used to obtain composite sheets or blocks of conglomerate material using Bretonstone technology, the method according to the present invention is advantageously applied to the residual mix and to the cleaning waste following a relatively prolonged stoppage of the production plant.
According to the invention, the uncompacted waste is thus introduced inside an oven which uses as a heat source a generator of radiofrequency waves, i.e. at a frequency of less than 300 MHz, and is heated to temperatures of 100-1200C and kept at this temperature for a period of 15-20 minutes.
Owing to the action of the catalyst and the additives present in the initial mix, the polyester resin contained in the mix is thus catalysed, bonding all the styrene contained inside it.
The radiofrequency waves allow rapid heating internally of the soft mass of uncompacted mix, causing catalysis of the resin and combination of the monomer contained inside it. The same result would not be obtained with other heat sources generally used in the industry; heating with hot air or with infrared rays would in fact result only in superficial heating of the granular mass and moreover cause rapid evaporation of the styrene, the absence of which would then make catalysis of the resin impossible.
The radiofrequency waves used have a frequency of less than 300 MHz (maximum limit) and preferably between 25 and 35 MHz. The frequency is chosen so as to guarantee an optimum heating efficiency depending on the type of resin and aggregate with which the material of the mix is formed.
By means of heating with radiofrequency waves, the polyester resin is also rendered inert and therefore no longer polluting and the reactive styrene is also bonded to the resin and therefore loses its toxicity.
According to one constructional solution of the invention, the plant for rendering material inert comprises, as shown in Figures 1 and 2, a station 11 for charging the mix to be rendered inert, a station 13 for heating said mix by means of a dielectric heating oven 18, and a station 14 for discharging the inert mix.
In particular, the charging station 11 has a hopper 16 containing the mix to be rendered inert, i.e. the residual mix and the cleaning waste. This mix is broken up into small fragments by means of a lump-breaking device 15 of the known type with blades having two counter-rotating shafts and then conveyed by an extractor belt 17 onto conveying means 12, preferably of the belt type, of the heating station 13. In this way the mix is present in the form of a soft and loose mass.
The material to be treated, in the form of lumps or mounds or in a fairly small-size mass, is charged onto the conveyor means 12, forming for example a layer with a thickness of - A -
5-20 cm, and together with the conveyor means 12 passes through the antennae of a tunnel oven 18 where it undergoes radiofrequency heating. Preferably, the soft mass is charged onto the belt 12 in the form of small piles 19 which are about 10-20 cm high and spaced from each other by a few centimetres; in this way the catalysed mix leaving the oven 18 is in the form of hard and porous agglomerations having dimensions of a few tens of centimetres, which may be easily conveyed to the discharging station 14 or into a storage container.
In the case of a plant functioning using the Bretonstone technology for the production of sheets of agglomerated material and implementing the method according to the invention, said plant therefore comprises in succession: - a first station for preparing the mix by mixing a granulated material of predetermined particle size and a fine filler with an organic binder;
- a second station for distributing said mix inside a tray mould so as to form a layer of mix;
- a third station for performing vacuum vibrocompression so as to obtain a compacted sheet;
- a fourth catalysis station comprising heating ovens for catalysis of the organic binder so as to obtain the final sheet; and
- a station with an oven where dielectric heating is performed at radiofrequency so as to render inert the residual mix and the cleaning waste, operating as a plant for rendering material inert as described above.
The inert material thus obtained may be transported to a normal waste tip without the need for special authorisation or, alternatively, may be used for different purposes.
For example, the inert material may be used as a filling aggregate or foundation material in building work or, after being crushed to a suitable particle size, may be used as a filling aggregate for the preparation of concrete or other cement mortars.
Obviously the method according to the invention which envisages the use of radiofrequency waves for rendering inert polyester resin present in a mixture may also be used for industrial applications for the neutralisation or reclamation of products other than the residual mix arising in the Bretonstone technology. Functionally or conceptually equivalent modifications and variations are possible and may be envisaged while remaining within the scope of the invention as defined by the following claims.

Claims

Claims
1. Method for rendering inert a loose mixture comprising a hardenable resin which is dissolved in an organic solvent and to which a catalyst is added, said resin being mixed with aggregates, characterized in that said mixture is subjected to a dielectric heating step.
2. Method according to Claim 1, characterized in that said resin is a polyester resin dissolved in styrene and said mixture comprises a thin filler and if necessary a catalysis accelerator/initiator.
3. Method according to Claim 1 or 2, characterized in that said heating step is performed with the use of radiofrequency electromagnetic waves having a frequency of less than 300 MHz.
4. Method according to Claim 3, characterized in that said radiofrequency waves have a frequency of between 25 and 35 MHz.
5. Method according to Claim 1 or 2, characterized in that said heating step raises the temperature of the mix to about 100-2000C.
6. Method according to Claim 5, characterized in that the mix is kept at a high temperature for about 15-20 minutes.
7. Plant for rendering inert a loose mixture comprising a hardenable resin which is dissolved in an organic solvent and to which a catalyst is added, said resin being mixed with aggregates, characterized in that it comprises a station (11) for charging the mix to be rendered inert, a heating station (13) for heating said mix by means of a dielectric heating oven (18) and a discharging station (14) for discharging the mix rendered inert by means of this oven (18).
8. Plant according to Claim 7, characterized in that said heating station (13) uses electromagnetic waves with a frequency of less than 300 MHz.
9. Plant according to Claim 8, characterized in that electromagnetic waves with a frequency of between 25 and 35 MHz are used in said heating station (13).
10. Plant according to Claim 7, characterized in that said heating station (13) is provided with a conveyor belt (12) on which the mixture is deposited in a layer with a thickness of about 5-20 cm.
11. Plant according to Claim 10, characterized in that said layer is divided into small heaps or mounds with a height of 10-20 cm.
12. Plant for the production of sheets of agglomerated material comprising, in succession: - a first station for preparing a mix by mixing a granulated material of predetermined particle size and a fine filler with a hardenable resin dissolved in a reactive organic solvent to which a catalyst is added;
- a second station for distributing said mix inside a temporary support, preferably a tray mould, so as to form a layer of mix; - a third station for performing vacuum vibrocompression so as to obtain a compacted sheet;
- a fourth catalysis station comprising heating ovens for the catalysis of the resin so as to obtain the final sheet, characterized in that it comprises means for dielectric heating of the resin contained in the residual mix and in the cleaning waste, so as to render said resin inert.
PCT/IB2007/052750 2006-08-04 2007-07-10 Method and plant for rendering inert a loose mixture consisting of a hardenable resin and aggregates Ceased WO2008015596A2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US12/376,239 US8030441B2 (en) 2006-08-04 2007-07-10 Method and plant for rendering inert toxic substances in uncompacted residual material containing hardenable resin and aggregrates
EP07825915A EP2046563B1 (en) 2006-08-04 2007-07-10 Method and plant for rendering inert a loose mixture consisting of a hardenable resin and aggregates
KR1020097004574A KR101395998B1 (en) 2006-08-04 2007-07-10 Method and plant for rendering inert a loose mixture consisting of a hardenable resin and aggregates
AT07825915T ATE524302T1 (en) 2006-08-04 2007-07-10 METHOD AND SYSTEM FOR PREPARING A LOOSE MIXTURE OF A CURED RESIN AND AGGREGATE MATERIALS
CA2659810A CA2659810C (en) 2006-08-04 2007-07-10 Method and plant for rendering inert a loose mixture consisting of a hardenable resin and aggregates
IL196862A IL196862A (en) 2006-08-04 2009-02-02 Method and plant for rendering inert a loose mixture consisting of a hardenable resin and aggregates

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTV2006A000141 2006-08-04
IT000141A ITTV20060141A1 (en) 2006-08-04 2006-08-04 PROCEDURE AND PLANT TO HUE AN INCOERENT MIXTURE OF A HARD RESIN AND INERT

Publications (3)

Publication Number Publication Date
WO2008015596A2 true WO2008015596A2 (en) 2008-02-07
WO2008015596A3 WO2008015596A3 (en) 2008-05-02
WO2008015596A8 WO2008015596A8 (en) 2009-04-23

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PCT/IB2007/052750 Ceased WO2008015596A2 (en) 2006-08-04 2007-07-10 Method and plant for rendering inert a loose mixture consisting of a hardenable resin and aggregates

Country Status (9)

Country Link
US (1) US8030441B2 (en)
EP (1) EP2046563B1 (en)
KR (1) KR101395998B1 (en)
AT (1) ATE524302T1 (en)
CA (1) CA2659810C (en)
ES (1) ES2371115T3 (en)
IL (1) IL196862A (en)
IT (1) ITTV20060141A1 (en)
WO (1) WO2008015596A2 (en)

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US9289923B1 (en) 2015-01-30 2016-03-22 Cambria Company Llc Synthetic molded slabs, and systems and methods related thereto
US9613412B1 (en) 2015-12-21 2017-04-04 Cambria Company Llc Stone slab manufacturing methods and systems
US10467352B2 (en) 2017-04-03 2019-11-05 Cambria Company Llc Stone slab production methods and systems
US12030260B1 (en) 2020-01-02 2024-07-09 Cambria Company Llc Stone slabs, systems, and methods
US12151395B2 (en) 2021-05-13 2024-11-26 Cambria Company Llc Textured stone slabs, systems, and methods
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US12594689B2 (en) 2022-11-16 2026-04-07 Cambria Company Llc Metallic stone slabs, systems, and methods

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KR101395998B1 (en) 2014-05-16
WO2008015596A3 (en) 2008-05-02
US8030441B2 (en) 2011-10-04
CA2659810C (en) 2014-12-09
ITTV20060141A1 (en) 2008-02-05
EP2046563B1 (en) 2011-09-14
CA2659810A1 (en) 2008-02-07
WO2008015596A8 (en) 2009-04-23
EP2046563A2 (en) 2009-04-15
KR20090049058A (en) 2009-05-15
IL196862A (en) 2014-07-31
US20100160708A1 (en) 2010-06-24
ATE524302T1 (en) 2011-09-15
ES2371115T3 (en) 2011-12-27
IL196862A0 (en) 2009-11-18

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