ES2435500A1 - Installation and method for the sifting and bagging of carbon black - Google Patents

Abstract

The invention allows the recycling, recovery and valorisation of the industrial waste called suction carbon black, consisting of carbon black mixed with impurities such as particles of scrap iron, plastic, wood, screws, and washers. The installation comprises a receiving hopper (7) via which the suction carbon black is introduced, a vibratory sifter (8) which separates the impurities from the carbon black, and a magnetic grid (12) which allows the collection of the small iron impurities dragged along by the carbon black that passed through the vibratory sifter (8). Said installation also has transport and lifting means (3, 4) for receiving the impurity-free carbon black that falls through the magnetic grid (12), and for transporting and lifting same for the subsequent bagging thereof, free of impurities, preferably in small bags, for reusing in secondary applications of the rubber industry.

Description

OBJECT OF THE INVENTION

The object of the present invention is related to the recycling, recovery and recovery of the industrial waste called "suction carbon black" consisting of carbon black mixed with impurities, such as for example scrap particles, plastic, wood, screws, washers

The object of the invention is the installation and the procedure for screening and separating the carbon black from the rest of impurities that are not usable, to subsequently pack the carbon black free of impurities, for reuse in secondary applications of the rubber industry.

BACKGROUND OF THE INVENTION

Carbon black is a product widely used in the tire industry and in almost all rubber articles used in cars, due to its reinforcing action.

One of the most common treatments applied to out-of-use tires is thermolysis, where tire residues are subjected to high temperatures and lack of oxygen, until the residue is separated into three products: liquid hydrocarbons (diesel) hydrocarbons soda (similar to natural gas) and carbon black.

The carbon black obtained has similar properties to commercial carbon blacks, which are mainly used in the plastic sector as pigments or in the manufacture of tires.

Likewise, recycled carbon black is generally used to reinforce rubber products, as well as paints, inks and toner.

Carbon black is usually present in tire manufacturing processes, and due to its volatility it ends up being deposited in different places of the factory, constituting an element that mixed with other waste materials is annoying, polluting and contributes greatly to dirty the facilities.

The cleaning of these facilities involves the dragging of large amounts of carbon black that is mixed with other waste materials or impurities, such as, for example, chips, plastics, screws, ..., a mixture that is finally discarded, constituting a polluting product.

The possibility of giving a value to this material, initially of waste, and of separating and recovering the carbon black from the rest of impurities for other applications, and supplying it in a manageable format ready for distribution, constitutes the object of the invention that described below.

DESCRIPTION OF THE INVENTION

According to one of the objects of the invention, a carbon black screening and bagging installation is described below, in which suction carbon black formed by carbon black mixed with impurities or waste particles such as scrap is introduced , plastic, wood, screws, washers, and others, installation that allows screening and separation of carbon black from impurities and its subsequent bagging for reuse in secondary applications.

The installation for the recycling of the suction smoke black consists essentially of a silo in which the separation of the suction smoke black is carried out with respect to the impurities, means of transport and elevation that raise the carbon black free of impurities obtained in the silo, directing it for later bagging.

It is preferably provided that the installation incorporates a vertical bagger adapted to work with carbon black, in which the clean carbon black drawn by the transport and lifting means is discharged, in which its bagging is carried out in 8-10 kg bags.

In an alternative or complementary solution to the use of the vertical bagger, it is provided that the lifting and transport means incorporate a discharge sector for the extraction and storage of clean carbon black directly in large containers or sacks called big-bags, of 800 Kg for example.

The installation also preferably incorporates a suction system to facilitate the extraction of the small carbon black particles that remain suspended in the air in the different sections of the installation, a system comprising a general suction line formed by ducts and several points or elements of local extraction destined to aspirate the dust that is aired in the different phases of the process, and a central of aspiration in which the aspiration line converges.

The silo has a receiving hopper through which the suction smoke black is introduced into containers, preferably these containers consist of bags called "big bags" of approx. 600 kg, which are placed inside the hopper, in which a vibrating screen is located inferiorly. The container inside the hopper opens so that the material it contains falls on the screen. Optionally, carbon black can be introduced into the silo in other containers alternative to the big-bag, such as drums, boxes or in another format, in which case the discharge will be carried out manually or by means of an appropriate tool.

In the vibrating screen, the separation of impurities or fragments carried by the black of suction smoke is carried out, separating the black of smoke of very fine particle size with respect to the impurities (larger pieces / pieces). The screen has a sheet metal grid with holes and at least one vibrator that helps move the material and it flows through the holes, leaving the impurities on the grid.

Next to the receiving hopper is a lower hopper, which incorporates a magnetic grill in upper arrangement that allows the small iron impurities that the carbon black that passed through the vibrating screen to be collected. Impurities or unusable particles are extracted from the grid, preferably manually, as well as from the magnetic grid, then these particles are managed as industrial waste.

Once the carbon black leaves the lower hopper completely clean, it is collected by means of transport and elevation located below, which direct it towards its bagging, these means of transport and elevation preferably comprise a first conveyor auger and a second conveyor auger, located next to the first auger, which receives the material from the first auger and transports it for bagging. In the case of having the vertical bagger, it will be located next to the second conveyor auger.

The vertical bagger allows bags of the required size and weight to be made within predetermined machine variables. In this case, a bagger is used to obtain recycled carbon black bags of 8-10 kg, which will facilitate the handling, transport and distribution of this type of material, giving added value to a product traditionally intended for scrap

The vertical bagger has in its rear zone some reels of plastic sheets with which the bags are going to be formed, as well as it shows in its frontal zone a forming tube with a cylindrical shape in its base and body, and in the form of a tie in its upper part, to which the plastic sheet from the coil is directed with the help of rollers, adapting the sheet around the forming tube to configure a laminar shell that will eventually give rise to the bag.

The vertical bagger incorporates an inlet hopper that can incorporate a blender that does not let the material cake or stick on the walls of the hopper. At least one third, endless screw is preferably located under the inlet hopper, which transports the material to a weigher that allows the precise weight of the bags produced to be selected.

Under the weigher is the forming tube around which the bag is formed. When a bag is to be filled, the weigher releases the material, which falls through the forming tube to the bag that is closed next, and is cut and separated from the rest of the wrapping body.

The bagging machine then preferably has an element that perforates the plastic, in such a way that it allows the expulsion of the air through a probe without the material coming out. In this way, vacuum bags are made.

Once the bags are filled, they are evacuated with a conveyor belt for later palletizing.

Another object of the invention is the screening procedure and bagging of carbon black by means of the described installation, a procedure that proceeds according to the following steps:

-

reception and storage of a container of the suction carbon black formed by carbon black and impurities, preferably the container consists of the bag called big bag with a capacity of approx. 600 kg,

-

positioning and loading of the container inside the receiving hopper,

-

opening of the container so that the suction smoke black is deposited in the vibrating screen,

-

actuation of the vibrators, to move the material with impurities, so that the impurities remain in the grid, and removal of the impurities from the grid,

-

separation in the magnetic grid of the small-sized metal elements that have filtered through the grid to obtain clean carbon black,

-

driving of the transport and lifting means to transport the clean carbon black for subsequent bagging, and

-

bagging of clean carbon black.

In the case of using the vertical bagger the bagging of the clean carbon black is carried out in the bagger intended for the bagging of small bags, preferably between 8 and 10 kg, according to the following phases:

-

reception of clean carbon black in the entrance bag of the vertical bagger, from the lifting and transport means,

-

Weighing the clean carbon black in the weigher in the intended amount,

-

conformation of bags, preferably bags of 8-10 kg capacity. in the vertical bagger, and bagging of the clean carbon black that falls from the weigher into the pre-determined weight bags, and

-

evacuation and palletizing of the bags.

DESCRIPTION OF THE DRAWINGS

To complement the description that is being made and in order to help a better understanding of the characteristics of the invention, according to a preferred example of practical implementation thereof, a set of drawings is attached as an integral part of said description. where, for illustrative and non-limiting purposes, the following has been represented:

Figure 1.- Shows a general view of the installation object of this invention in which the constituent elements thereof are represented.

Figure 2.- Shows a detailed view of the silo.

Figure 3.-Shows a side view of the bagging machine.

PREFERRED EMBODIMENT OF THE INVENTION

In view of the figures, a preferred embodiment of the installation and method of screening and bagging of carbon black constituting the object of this invention is described below.

As can be seen in figure 1, the carbon black screening and bagging system comprises: a silo (1), which receives the containers (2), in this case the container consists of a sack (2) called big -bag, containing the suction carbon black comprising a mixture of carbon black with impurities or waste materials, silo (1) in which the separation of the carbon black from the impurities is carried out, screws Conveyor augers (3, 4) that transport and raise the black particles of fumes free of impurities obtained in the silo (1), and a vertical bagger (5), located below, which receives the carbon black free of impurities the augers (3, 4), and carries out its bagging in small bags, preferably with a capacity of between 8-10 Kg.

The silo (1), as seen in Figure 1, or in detail in Figure 2, comprises a receiving hopper (7) through which the suction smoke black is introduced, a sieve

vibrator (8) located inside the receiving hopper (7), consisting of a grid (9) equipped with holes and vibrators (10) applied on the grid (9) that help move the material as it flow through the holes leaving the impurities on the grid (9), as well as the silo (1) then has the receiving hopper (7) of a lower hopper (11), and a magnetic grill (12) in an arrangement superior to the lower hopper (11), which allows the small iron impurities that the carbon black that passed through the vibrating screen (8) to be collected, and drops the carbon black free of impurities, towards one of the conveyor augers, specifically towards the first auger screw (3) located below the lower hopper (11).

As can be seen in figure 1, the receiving hopper (7) incorporates a hoist (23) capable of handling containers (2) of approximately 600kg.

In figure 1 it is observed that the first auger screw (3) has a concrete inclination and leads to a second auger screw (4) located below, the latter feeding sector being located in correspondence with the outlet sector of the first auger screw (3), the output sector of the second auger being

(4) in correspondence with the entrance to the vertical bagger (5). The second auger (4) shows a greater inclination and length than the first auger (3).

The vertical bagger (5), as seen in Figure 1 or in Figure 3, incorporates an inlet hopper (22), which receives the clean carbon black from the second screw (4), a weigher ( 13) weighing the carbon black that is introduced into the vertical bagger (5) by the inlet hopper (22) until reaching the amount by weight to be bagged, as well as incorporating at least a third auger (24) of small size that transports the material of the entrance hopper (22) towards the weigher (13). Next, the vertical bagger (5) has a forming tube (14) around which an enveloping laminar body is formed that receives the clean carbon black in the heavy amount that falls from the weigher (13). Then the enveloping laminar body will close forming a bag that houses the clean carbon black.

In figures 1 or 3 it can be seen that the vertical bagger (5) also consists of a coil (15), which houses a sheet (25) that after passing through a series of rollers and adapting around the forming tube (14 ) is transformed into the aforementioned laminar body that subsequently gives rise to the bag that houses the carbon black.

Figure 1 also shows that the second auger (4) may incorporate an alternative

or in addition to the bagger (5) a discharge sector (26) for the extraction and storage of clean carbon black directly in large containers (27) or so-called bags, of 800 kg for example, located in correspondence.

In Figure 1 it can be seen that the installation additionally has a suction line (6), which converges in a general suction unit (17), in which the suction line (6) has air ducts ( 18), local extraction elements (19) provided with a tubular portion (20) and a filter (21), as can be seen in detail in Figure 2. In this particular case, without ruling out other options, the elements of local extraction (19) are located in correspondence with the lower hopper (11), with the unloading sector (26), with the inlet hopper (22) of the vertical bagger (5), with the weigher (13) and with the forming tube (14).

Claims (13)

 RE I V I N D I C A C I O N E S 1.-Installation of screening and bagging of carbon black, characterized in that it comprises:

-

a silo (1) intended to receive containers (2) containing suction carbon black comprising a mixture of carbon black with impurities or waste materials, silo (1) which in turn comprises:

a receiving hopper (7) where the suction smoke black is introduced, a vibrating screen (8) located inside the receiving hopper (7), consisting of a grid (9) equipped with holes and vibrators (10) applied on the grid (9) that help move the black of suction smoke since the carbon black flows through the holes leaving the impurities on the grid (9), a lower hopper (11) located next to the receiving hopper (7), and a magnetic grill (12), located in an upper arrangement than the lower hopper (11), which allows to collect the small iron impurities that drag the black of smoke that passed through the vibrating screen (8), and

-

means of transport and elevation (3, 4) destined to receive the black of smoke free of impurities, which falls through the magnetic grill (12), and to transport it and raise it for its subsequent bagging.

2.-Installation of screening and bagging of carbon black according to claim 1 characterized in that the transport and lifting means (4) comprises a discharge sector (26) intended for the discharge of the clean carbon black into containers of large size (27), preferably 800kg, that could be placed in correspondence with said discharge sector (26). 3.-Installation of screening and bagging of carbon black according to any one of claims 1 or 2 characterized in that it additionally comprises a vertical bagger (5) intended for bagging particles in small bags, preferably between 8 and 10 Kg , located next to the means of transport and elevation (3, 4) to receive the black of clean smoke transported by said means of transport and elevation (3, 4). 4.-Installation of screening and bagging of carbon black according to claim 3 characterized in that the means of transport and elevation (3, 4) comprise a first screw (3) that has an inclination and flows into a second screw (4) located next, the latter's feeding sector being located in correspondence with the output of the first auger (3), the outlet sector of the second auger (4) being in correspondence with the entrance to the vertical bagger (5), in which the second auger (4) shows a greater inclination and length than the first auger (3). 5. Installation of screening and bagging of carbon black according to any one of claims 3 or 4 characterized in that the vertical bagger (5) comprises:

-

an inlet hopper (22), which receives the clean carbon black from the transport and lifting means (3, 4),

-

a weigher (13) weighing the carbon black that is introduced into the vertical bagger (5) by the inlet hopper (22) until reaching the amount by weight to be bagged,

-

a forming tube (14) around which an enveloping laminar body is formed that receives the black of clean smoke in the heavy amount that falls from the weigher (13), and closes forming a bag that houses the black of clean smoke,

-

a coil (15) that houses a sheet (25) that is transformed into the enveloping laminar body that subsequently gives rise to the bag.

6. Installation of screening and bagging of carbon black according to any one of claims 1 to 3 characterized in that it additionally comprises a suction line (6) and a general suction center (17) that facilitate the extraction of particles of carbon black of small size that remain suspended in the air in different sections of the installation, in which the suction line (6) has air ducts (18) that converge in the general central of aspiration (17) , and local extraction elements (19) in correspondence with different sections of the installation provided with a tubular portion (20) and a filter (21). 7. Installation of screening and bagging of carbon black according to claim 1 characterized in that the receiving hopper (7) incorporates a hoist (23) capable of handling containers (2) of approximately 600kg. 8. Method of screening and bagging of carbon black which is carried out in the installation described in any one of claims 1-7, characterized in that it comprises the following steps:

-

reception and storage of a container (2) of suction carbon black formed by carbon black and impurities,

-

positioning and loading of the containers (2) inside the receiving hopper (7),

-

opening of the container (2) so that the suction carbon black is deposited in the vibrating screen (8),

-

actuation of the vibrators (10), to move the material with impurities, so that the impurities remain in the grid (9) and removal of the impurities from the grid (9),

-

separation in the magnetic grill (12) of the small-sized metal elements that have filtered through the grid (9) to obtain clean carbon black,

-

actuation of the transport and lifting means (3, 4) to transport the clean carbon black for subsequent bagging,

-

bagging of clean carbon black.

9. Screening and bagging process for carbon black according to claim 8, characterized in that the bagging of the clean carbon black is carried out in the bagging machine (5) intended for bagging small bags, preferably between 8 and 10 kg, according to the following phases:

-

reception of clean carbon black in the inlet hopper (22) of the vertical bagger (5) from the lifting and transport means (3, 4),

-

Weighing the clean carbon black in the weigher (13),

-

conformation of the bags in the vertical bagger (5) and bagging of the clean carbon black that falls from the weigher (13) into the bags in pre-determined weight,

-

evacuation and palletizing of the bags.

10. Screening and bagging process of carbon black according to claim 8, characterized in that the containers (2) are bags (2) called big bags with a capacity of approx. 600 kg. 11.-Screening and bagging process of carbon black according to claim 9 characterized in that the bags are bags with a capacity of 8-10 kg. 12. Screening procedure and bagging of carbon black according to claim 8 characterized in that the bagging of the clean carbon black is carried out in sacks (27) called big-bags, preferably 800kg, located in correspondence with a discharge sector (26) of the means of transport and lifting (4). SPANISH OFFICE OF THE PATENTS AND BRAND Application no .: 201330784 SPAIN Date of submission of the application: 05.29.2013 Priority Date: REPORT ON THE STATE OF THE TECHNIQUE 51 Int. Cl.: See Additional Sheet RELEVANT DOCUMENTS

Category

56 Documents cited Claims Affected

TO

GB 938304 A (CONTINENTAL CARBON CO) 02/10/1963, GB 938304 A (CONTINENTAL CARBON CO) 02.10.1963 & Summary of the EPODOC database. Recovered from EPOQUE; AN GB-2793661-A; Figure 1. 1-12

TO

GB 768558 A (PHILLIPS PETROLEUM CO) 20.02.1957 & EPODOC database summary. Recovered from EPOQUE; AN GB-377154-A; Figure 1. 1-12

TO

GB 475847 A (HUBER CORP J M) 11/26/1937, GB 475847 A (HUBER CORP J M) 26.11.1937 & EPODOC database summary. Recovered from EPOQUE; AN GB-401037-A; Figure 1 1-12

TO

CN 201880692U U (JIANGXI BLACK CAT CARBON BLACK CO LTD) 06/29/2011, CN 201880692 U (JIANGXI BLACK CAT CARBON BLACK CO LTD) 29.06.2011 & Summary of the EPODOC database. Recovered from EPOQUE; AN CN-201020620163-U; Figure 1. 1-12

TO

WO 0144405 A1 (TIRENERGY CORP) 06/21/2001, page 16, line 31 -page 18, line 23; Figure 1, 1-12

Category of the documents cited X: of particular relevance Y: of particular relevance combined with other / s of the same category A: reflects the state of the art O: refers to unwritten disclosure P: published between the priority date and the date of priority submission of the application E: previous document, but published after the date of submission of the application

This report has been prepared • for all claims • for claims no:

Date of realization of the report 09.12.2013

Examiner S. De Miguel De Santos Page 1/7

SPANISH OFFICE OF THE PATENTS AND BRAND Application no .: 201330784 SPAIN Date of submission of the application: 05.29.2013 Priority Date: REPORT ON THE STATE OF THE TECHNIQUE 51 Int. Cl.: See Additional Sheet RELEVANT DOCUMENTS

Category

56 Documents cited Claims Affected

TO

CN 101298522 A (LIN OUYANG) 05.11.2008 & Summary of the EPODOC database. Recovered from EPOQUE; AN CN-200810140441-A; Figure 1 1-12

TO

WO 0226914 A2 (FED RECYCLING TECHNOLOGIES INC ET AL.) 04/04/2002, page 14, lines 9-24; figure 3, 1-12

 TO

US 5894012 A (DENISON GILBERT W) 04/13/1999, column 5, line 1 - column 6, line 26; Figures 2-3. 1-12

TO

CN 201713106 U (SHANGHAI YAMATO SCALE CO LTD) 19.01.2011 & Summary of the EPODOC database. Recovered from EPOQUE; AN CN-201020239445-U; Figure 1. 5

TO

CN 202403781 U (XIAMEN MAIFENG SEAL PRODUCTS CO LTD) 29.08.2012 & Summary of the EPODOC database. Recovered from EPOQUE; AN CN-201120571950-U; Figure 1. 5

Category of the documents cited X: of particular relevance Y: of particular relevance combined with other / s of the same category A: reflects the state of the art O: refers to unwritten disclosure P: published between the priority date and the date of priority submission of the application E: previous document, but published after the date of submission of the application

This report has been prepared • for all claims • for claims no:

Date of realization of the report 09.12.2013

Examiner S. De Miguel De Santos Page 2/7

SPANISH OFFICE OF THE PATENTS AND BRAND Application no .: 201330784 SPAIN Date of submission of the application: 05.29.2013 Priority Date: REPORT ON THE STATE OF THE TECHNIQUE 51 Int. Cl.: See Additional Sheet RELEVANT DOCUMENTS

Category

56 Documents cited Claims Affected

TO

EN 2139166T T3 (ALSACIENNE D APP DE MAUTENTIO) 01/02/2000, ES 2139166 T3 (ALSACIENNE D APP DE MAUTENTIO) 01.02.2000 & Summary of the EPODOC database. Recovered from EPOQUE; AN ES-95440034-T 4

Category of the documents cited X: of particular relevance Y: of particular relevance combined with other / s of the same category A: reflects the state of the art O: refers to unwritten disclosure P: published between the priority date and the date of priority submission of the application E: previous document, but published after the date of submission of the application

This report has been prepared • for all claims • for claims no:

Date of realization of the report 09.12.2013

Examiner S. De Miguel De Santos Page 3/7

REPORT OF THE STATE OF THE TECHNIQUE Application number: 201330784 CLASSIFICATION OBJECT OF THE APPLICATION B65B1 / 02 (2006.01) B07B1 / 00 (2006.01) C09C1 / 48 (2006.01) Minimum documentation sought (classification system followed by classification symbols) B65B, B07B, C09C Electronic databases consulted during the search (name of the database and, if possible, terms of search used) INVENTIONS, EPODOC State of the Art Report Page 4/7  WRITTEN OPINION Application number: 201330784 Date of Written Opinion: 09.12.2013 Statement

Novelty (Art. 6.1 LP 11/1986)

Claims 1-12 YES

Claims

NO

Inventive activity (Art. 8.1 LP11 / 1986)

Claims 1-12 YES

Claims

NO

The application is considered to comply with the industrial application requirement. This requirement was evaluated during the formal and technical examination phase of the application (Article 31.2 Law 11/1986).  Opinion Base.- This opinion has been made on the basis of the patent application as published. State of the Art Report Page 5/7  WRITTEN OPINION Application number: 201330784  1. Documents considered.- The documents belonging to the state of the art taken into consideration for the realization of this opinion are listed below.

Document

Publication or Identification Number publication date

D01

GB 938304 A (CONTINENTAL CARBON CO) 02.10.1963

D02

GB 768558 A (PHILLIPS PETROLEUM CO) 02/20/1957

D03

GB 475847 A (HUBER CORP J M) 11/26/1937

D04

CN 201880692U U (JIANGXI BLACK CAT CARBON BLACK CO LTD) 06.29.2011

D05

WO 0144405 A1 (TIRENERGY CORP) 06.21.2001

D06

CN 101298522 A (LIN OUYANG LIN OUYANG) 05.11.2008

D07

WO 0226914 A2 (FED RECYCLING TECHNOLOGIES INC et al.) 04.04.2002

D08

US 5894012 A (DENISON GILBERT W) 13.04.1999

D09

CN 201713106U U (SHANGHAI YAMATO SCALE CO LTD) 01.19.2011

D10

CN 202403781U U (XIAMEN MAIFENG SEAL PRODUCTS CO LTD) 29.08.2012

D11

ES 2139166T T3 (MAINTENANCE APP D ALSACIENNE) 01.02.2000

2. Statement motivated according to articles 29.6 and 29.7 of the Regulation of execution of Law 11/1986, of March 20, on Patents on novelty and inventive activity; quotes and explanations in support of this statement The invention, in the first place, seeks to protect a smoke black screening and bagging facility to revalue the industrial waste generated in the rubber industry that incorporates a silo

(one)

 to which the suction smoke black containers (2) arrive in which there is a receiving hopper

(7)

 inside which there is a vibrating screen (8) consisting of a grid with holes and vibrators (10), a lower hopper (11) following the receiving hopper (7) and a magnetic grill

(12)

 located above the lower hopper (11) and means of transport and lifting of the black of smoke free of impurities.

The device is defined in claims 1 to 7. But the method of screening and bagging of carbon black carried out in the installation described in claims 1 to 7 is also described in claims 8 to 12. No device has been found in the state of the art that is specifically used to treat suction carbon black, mixture of carbon black and waste materials. But if a carbon black recovery device such as documents D01 and D02 have been found in which carbon black mixed with impurities is suspended in a gas stream. We also have document D03 in which carbon black passes through different compartments with drums to conveyor 75 for packaging. It is also worth noting document D04 which discloses a carbon black filtering device in which there is a screening plate, a vibrating screening machine, magnetic media and a packaging machine at the bottom. On the other hand, within the rubber industry, in particular, in the recycling of tires, numerous patent documents, D05, d06, D07 and D08 have been found in which the treatment of revaluation of carbon black obtained by pyrolysis of the recycling of rubber waste. In these cases, the carbon black obtained is not of high quality and is subjected to a recovery procedure. This procedure takes place in a device in which the carbon black is transported through a conveyor / chiller belt State of the Art Report Page 6/7  WRITTEN OPINION Application number: 201330784 obtained by pyrolysis to a sieve (69) to remove larger impurities and then to a magnetic grill (69) to remove the iron or metal impurities that still remain. On the other hand, patent documents, D09 and D10, have also been found, in which carbon black past devices are disclosed. And in relation to claim 4, the use of two inclined conveyor belts is observed in document D11. But, despite the above, no document has been found that by itself or in combination with others affects the novelty or inventive activity of the invention according to articles 6.1 and 8.1 of Patent Law 11/1986. State of the Art Report Page 7/7