NL2001639C2 - Separation of metal-containing fractions from slag or production streams for waste incineration slag, by processing slag into fractions, separating iron-containing fractions and separating non-ferrous metal-containing fractions - Google Patents

Abstract

Separation of metal-containing fractions from slag or production streams comprises supplying and processing the slag into fractions, pre-separating fractions to separate iron-containing fractions, and separating non-ferrous metal-containing fractions using an eddy current separator (26-28). The fractions have a size of not > 5 mm and are kept dry when non-ferrous metal-containing fractions are separated. An independent claim is included for a separation device used for separation of metal-containing fractions from slag or production streams.

Description

P29324N LOO / KHO / -

Brief description: Method for separating metallic fractions from dry slag and using this method for waste incineration lacquer.

The present invention relates to a method for separating metallic fractions from slag comprising the successive steps of: supplying the slag; processing the slag into fractions; pre-separating the fractions, wherein substantially all ferrous fractions are separated with the aid of, for example, Neodymium or Ferrite magnets; and separating non-ferrous metal-containing fractions using an eddy current separator.

Such a method is known from the prior art. This method is applied, for example, to the processing of waste incineration lacquer from a waste incinerator. The waste incineration lacquer that has just come out of the oven is first cooled with water. The wet waste incineration lacquer consisting essentially of lumps with dimensions varying between 0 and 250 mm is then supplied to a separator. In the separation device, the slag is processed into fractions in a first step. This is done, for example, with the aid of a breaking device or grinding device. Parallel to this step, part of the slag is often sorted out manually. Due to the manual sorting, large metal-containing lumps can be separated early in the process, which benefits the efficiency of the process. After processing into fractions, ferrous fractions are separated. This step in the process is called pre-separation. By pre-separating with, for example, a strong magnet, a considerable part of the supplied fractions can already be separated.

Subsequently, the non-ferrous metal-containing fractions are separated with the aid of an eddy current separator.

A major drawback of the known method is that a too small part of the non-ferrous metal present can be separated in the fractions. Within the separation technology for waste incineration varnish, but also for separating other slag, the aim is to separate as many metals as possible from the slag with the highest possible purity of the metals.

The object of the present invention is to provide a method which at least partially overcomes at least one of the abovementioned disadvantages or at least offers a usable alternative. In particular, it is an object of the invention to provide a method with a high degree of separation of metal from slag.

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This object has been achieved with a method as defined in claim 1. A characteristic feature of the method according to the invention is that the slag is dry when the slag is processed into fractions. In practice, cork dry is used. It is further characteristic of the method according to the invention that the fractions have a size of at most 5 mm when pre-separating and separating non-ferrous metal-containing fractions.

It has been found that dry slag must be used in the first place in order to ultimately be able to separate a higher percentage of the metals present. The dry slag has a moisture content of at most 5%. If the moisture percentage in the slag is too high, the metals can diffuse into the slag, making the metals very difficult to mechanically separate later. For waste incineration lacquer, this means that the slag no longer has to be subjected to a cooling process step with water or another cooling medium. This could cause the moisture content of the waste incineration lacquer to become too high. Due to the insight that a dry process according to the invention must be used instead of a wet process, metal can advantageously be removed from the slag with a higher efficiency. By the method according to the invention, such a high percentage of metals can be separated from the slag that residual clean slag fractions can be taken into consideration for use in, for example, the cement industry as a raw material substitute. This is not only advantageous because savings can be achieved with this on raw materials, but also because savings can be achieved with this on depot costs. In any case, considerable savings on deposit costs can be achieved, because considerably fewer metals remain in the deposited slag fractions. In addition, profits can be achieved through the sale of the extracted metals to metal traders.

In the second place, it has been found according to the invention that a higher degree of separation of metals can advantageously be achieved by ultimately processing substantially all slag into fractions with dimensions of at most 5 mm. The fractions of at most 5 mm are fed further in a stream for further processing according to the method according to the invention. An explanation for the improved separation with a stream of fractions with a maximum dimension of at most 5 mm can be that a so-called monocell structure of the fractions has been obtained with this dimension. As a result, the fractions consist essentially of one type of material, so that a higher degree of purity of materials can be obtained with later separation of the fractions. Tests have shown that a degree of separation of metals from the slag of at least 95% can be achievable. Moreover, it has been found that this fraction exhibits a greatly increased copper and brass content in addition to aluminum. In practice, it is assumed that all physically observable metals are separated. It has been found that with a fraction size of at most 5 mm, an optimum operation of the eddy current separator can be achieved. Namely, this eddy current separator tends to spray with larger fractions, so that the accuracy of the separation is reduced.

In a special embodiment of the method according to the invention, a portion of the fractions is separated before the stream of fractions of at most 5 mm from 5 ferrous fractions is stripped. Preferably, the fractions with a size of at most 1 mm, the so-called fine dust fraction, are separated from the stream of fractions with dimensions of at most 5 mm. This can be done, for example, by suction or by using a vibrating screen. Preferably, however, a special screen unit is used for separating the fine dust fraction, the screen unit having a screen cover with a cleaning device. For example, the screen deck can be automatically kept clean with vibrating rubber balls that bump against the bottom of the screen deck. After the removal of the fine dust fraction, a stream of fractions with dimensions of at least 1 mm and at most 5 mm remains for further processing. As a result of the prior separation of the fine dust fraction, the further separation process is thus simplified and more efficient.

According to the invention, the stream of fractions with dimensions of at most 5 mm is first subjected to a pre-separation step, in which ferrous fractions are separated. Preferably, a Neodymium magnet with a roller is used for pre-separation in the separation device, because a powerful magnetic field can be generated with this. With a very strong Neodymium magnet, a magnetic field of 9000-9500 Gauss can be obtained on the surface of the roll.

In a special embodiment, a double Neodymium magnetic roller is used for pre-separation, the magnetic rollers being arranged in a cascade arrangement. Moreover, it is advantageous for the ferrous fractions to be separated already at the beginning of the process, so that the ferrous parts no longer cause any hindrance in later separating the non-ferrous metallic fractions with a special non-ferrous separator. In the case of weak eddy currents, any iron-containing parts still disrupt the operation of this non-Ferro separator.

After pre-separation, according to the invention, other non-ferrous metal-containing fractions are separated from the stream of fractions. An eddy current separator is used to separate the non-ferrous fractions. The eddy current separator is in particular a separator with a non-metal drum with a rapidly rotating magnet rotor therein for generating current variations on the surface of the drum. The non-ferrous fractions are preferably supplied to the eddy current separator drum via a feed conveyor track. The drum is arranged at one end of the feed conveyor track. In an advantageous embodiment, the fast-rotating magnetic rotor rotates against the direction of transport of the current fractions. It has been found that the separation of non-ferrous metal-containing fractions with a stream of fractions with a maximum dimension of up to at most 5 mm with a magnet rotor rotating in the direction of transport is more effective. Advantageously, the non-ferrous metal-containing fractions with a higher purity can be separated from the non-metal-containing fractions.

In a preferred embodiment of the method according to the invention an extra powerful eddy current separator is used. Due to various measures, the eddy current separator can be extra powerful or more effective.

In an advantageous method according to the invention use can be made of an eddy current separator with an increased number of magnetic poles on the magnetic rotor. The increased number of poles can increase the frequency at which the eddy currents fluctuate in the fractions. A more accurate emission of non-ferrous metals can hereby be achieved, which further increases the effectiveness of the separation process. Preferably the magnet rotor used in the eddy current separator has at least 40 magnetic poles, but more preferably the magnet rotor has at least 44 poles. It has been found in practice that an increase in the number of poles on the magnet rotor to 44 poles can produce a particularly favorable result. This makes the eddy current separator eminently suitable for use with fractions with a size of at most 5 mm.

In an advantageous embodiment, the magnet rotor is rotated in the drum of the eddy current separator at a speed of at least 4000 rpm. It appears that the separation can be more effective at these higher speeds. The speed of rotation of the rotating magnet rotor is preferably at least 4500 rpm and more preferably at least 5000 rpm.

In a further preferred embodiment of the method according to the invention, at least two eddy current separators are arranged in a cascade arrangement. Preferably, three eddy current separators are arranged one behind the other to separate the metal-containing fractions from the supplied stream from fractions with a size of at most 5 mm.

The metal-containing fractions are advantageously separated with a higher purity by the arrangement of several eddy current separators.

The above-mentioned measures to optimize the eddy current separator, such as setting the rotational speed, the correct direction of rotation, using a magnetic roller with at least 40 poles and the cascade arrangement can be applied separately, but also in combination. Due to the combination of measures, the eddy current separator is particularly suitable for use in the method according to the invention for separating at the small fraction size.

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In a special embodiment of the invention, glass-containing fractions are separated in a further step of the process. Optical sensors are preferably used for this purpose, whereby the glass-containing fractions can be blown out of the flow of fractions with blow nozzles.

In a further particular embodiment of the invention, fractions containing stainless steel are also separated in a further step of the process.

Sensors and blow nozzles are preferably used for this purpose to blow the stainless steel-containing fractions out of the flow fractions. Fractions with a size of at least 16 mm are well suited for recovery via sensor separation. Alternatively or additionally, coarser stainless steel fractions of, for example, at least 60 mm can also be separated manually.

In a preferred embodiment of the method according to the invention, the step of processing coarse slag into fractions with a size of at most 5 mm comprises a number of intermediate steps. In an intermediate step, the fractions with a size of at least 5 mm are separated into an A-stream of fractions of 5-60 mm and a B-stream of fractions of at least 60 mm to about 200 mm. Subsequently, the fractions of the A-stream are sieved into a first discharge stream of fractions with a size of about 16 to about 60 mm, and a second discharge stream of fractions with a size of about 5 to about 16 mm. The tolerance on these upper limits is plus or minus 5 mm. This can be done using standard screening techniques. The discharge streams are passed over a separation unit with a magnet to separate the ferrous fractions.

For the first discharge current of 16-60 mm, preferably after magnet separation via a standard Neodymium magnet, either in roll form or over-band magnet, an eddy current separator is used with at least 22, in particular at least 33, magnetic poles, the magnetic rotor being in operation with the transport direction rotates at a speed of at least 3000 rpm, but preferably at least 3500 rpm to separate the non-Ferro fractions.

For the second discharge current of 5-16 mm, preferably after magnet separation via a standard Neodymium magnet roller or over-band magnet, an eddy current separator 30 is used with at least 40, in particular at least 44 magnetic poles, the magnet rotor rotating during operation with the transport direction a speed of at least 3000 rpm, but preferably at least 3500 rpm to separate the non-ferrous fractions.

In a further intermediate step stainless steel-containing fractions can be separated from the A-stream in accordance with the method according to the invention via sensor separation before the stream of fractions is further processed. The fractions of the B-stream 60-200 mm can be stripped of non-ferrous metals manually or via sensor separation and can be stripped of the ferrous parts via an over-band magnet. Thereafter, the remaining slag fractions are broken and sieved into fractions with a size of at most 60 mm. These fractions can then be supplied to the A-stream fractions.

Eventually the size of all fractions is reduced via the above-mentioned intermediate steps 5 to a size of at most 5 mm, the fractions having a so-called monocell structure.

The invention furthermore relates to the use of the method according to the invention on refuse incineration lacquer from a refuse incinerator. In the state of the art 10, the waste incineration varnish is cooled with water or another cooling medium. According to the invention, however, this wetting is omitted because dry slag is processed in the process. Keeping the slag dry prevents the diffusion or dissolution of metals in the waste incineration varnish. The dry waste incineration lacquer is then suitable for undergoing the steps described above from the method according to the invention.

A considerably higher yield of non-ferrous metals is advantageously obtained from the incineration slag. It has even proved possible by applying the method according to the invention to generate 3 to 4 times as much yield of non-ferrous metals from the refuse incineration varnish compared to traditional separation methods on wet incineration incineration varnish. It has further been found that the use of the method according to the invention on waste incineration varnish is particularly favorable for the recovery of metals originating from electrical components. Apparently the exclusively dry processing of the incineration varnish results in a very high proportion of non-ferrous (non-ferrous) metal-containing fractions in the fine slag fraction of at most 5 mm. A monocellular structure of the substances to be separated is already present in the fine slag fraction, which considerably improves the recovery of metal-containing fractions. The share of recovered Aluminum, Copper and Brass in particular can be considerably higher. In addition, it is apparently advantageous to reduce all remaining coarser slag after initial separation of metals via breaking and sieving to the same monocell structure in order to ultimately separate again via the same technique as with the original fine fraction on the ferrous and non-ferrous still present metals according to the method of the invention.

Advantageously, a greater profit can be achieved through the sale of the extracted metals and a greater saving can be achieved through lower costs for dumping the remaining cleaner fractions.

An important advantage is furthermore that CO2 rights can be obtained by the extraction of metals from a secondary process, such as the method according to the invention.

-7-

It is furthermore advantageous that the investment costs for setting up a separation device for carrying out the method according to the invention are low, wherein the payback time can remain short.

In the state of the art, the incineration slag is cooled from the oven with water, so that the slag becomes wet. However, the method according to the invention is based on dry slag. Due to the absence of the cooling step with water on the incinerator, small incinerator fractions can whirl after processing the incinerator into a stream of incinerator fractions. In an embodiment according to the invention, a separation device for performing the method is positioned near an exit of the waste incinerator. This advantageously prevents small waste incineration fractions from passing through the entire plant as dust and in particular at transfer points lead to problems. By starting the separation directly at the exit of the incinerator 30% of the total amount of slag can already be separated into fractions with a size of at most 5 mm.

It has been found that in addition to aluminum there is a high content of copper and brass in the original fine slag fraction. According to the method according to the invention, in particular the recovery of metals from the incineration of electronic waste is very successful. By also processing the remaining coarse incineration lacquer into small fractions, the fractions having a monocellular structure, substantially all of the metals present are thus can be recovered in high-purity incinerator.

In addition to the application of the method according to the invention to waste incineration varnish from an incinerator, the method can also be applied to other metal-containing slags from depots or to metal-containing ores from mines, provided that these metals are suitable for separation on the basis of eddy-current technology. Advantageously existing depots can thus be reduced and metals can be recovered in an efficient manner without the use of chemical processes, which can result in a considerable environmental benefit.

The invention will be further elucidated with reference to the annexed drawings which give a practical embodiment of the invention, but cannot be considered in a limiting sense, in which:

FIG. 1 shows a flow chart of steps from the method according to the invention:

FIG. 2 shows an extensive flow chart of steps prior to the steps of the method according to the invention: FIG. 3 shows a flow chart as shown in FIG. 2, further comprising steps for separating stainless steel and glass; and -8-

FIG. 4a, 4b show views of an eddy current separator that is particularly suitable for carrying out the method according to the invention.

Figures 1-3 show various flow diagrams of the method according to the invention. Figure 1 shows a flow chart 20 in which dry dust fraction with a size of at most 5 mm is processed. From the dust fraction of at most 5 mm, ferrous fractions Fe and other metallic fractions N-Fe are separated from the remaining fractions S. The flow chart 20 comprises four different phases I, II, III, IV. In the first phase I, dry slag, which has been processed into fractions with a maximum dimension of 10 mm, is supplied. The fractions with a size of at most 5 mm, the so-called dust fraction 21, are supplied via a supply conveyor.

In the next phase II, part of the dust fraction is separated with the aid of a separation device. This can be done, for example, with the help of separator 22 or with a dust remover 23. The separator 22 is designed as a vibrating screen. By vibrating the vibrating screen 15, a fine dust fraction of 0-1 mm is separated from the coarser dust fraction of 1-5 mm. The vibrating screen has a screen cover that is equipped with a self-cleaning mechanism. The self-cleaning mechanism comprises rubber balls which are in motion due to the vibration of the vibrating screen and thereby clean the screen cover. As an alternative to the dispenser 22 or in combination with the dispenser 22 a dust remover 23 can be used. The dust collector 23 comprises a chamber with a suction installation. The fine dust fraction can be extracted from the fractions with dimensions between 1 and 5 mm using the suction installation. After separating the fine dust fraction, a dust fraction of 1-5 mm remains, which is then further treated in a third phase III.

In the third phase III, a pre-separation is carried out with the aid of a magnetic field. During pre-separation, the fractions in a stream pass through a magnetic field. This allows the ferrous fractions to be separated from the stream of fractions. The ferrous fractions that are removed in the third phase III have a fraction size that varies from 1 to 5 mm. The further course of the process according to the invention is favorably influenced by pre-separating the fractions. A Neodymium magnet roll is used for an optimum separation result. The Neodymium magnet roll has an extra powerful design, with the magnetic strength on the surface of the magnet roll being approximately 9000-9500 Gauss. This makes the magnetic roller eminently suitable for pre-separating the small ferrous fractions. To further improve the separation result, two magnets 24, 25 can be placed one behind the other.

In a fourth phase IV of the method according to the invention the current fractions pass through three eddy current separators, so-called Eddy Current switches 26, 9-27, 28. A changing magnetic field is generated with the aid of the eddy current separator. When an electrically conductive fraction passes this changing magnetic field, an electric voltage, a so-called eddy current, is generated in the fraction. Each eddy current here generates its own magnetic field that is opposite to the magnetic field that prevails in the immediate vicinity of the fraction. This ensures that the electrically conductive fractions are ejected and thrown out of the magnetic field. Due to material differences of the fractions, the fractions are repelled or attracted differently, so that a separation of the fractions results. In the method according to the invention, the electrically conductive fractions are the metal-containing fractions. These are non-ferrous metals, because in an earlier phase of the process substantially all ferrous metals have already been separated.

The eddy current separators used have a magnetic rotor that rotates during operation at a speed of at least 4000rpm. The magnet rotor used is provided with at least 40 magnetic poles for generating a high-frequency magnetic field. During operation, the magnetic rotor rotates against the direction of transport of the stream of supplied fractions.

The three eddy current separators 26, 27, 28 are placed in a cascade arrangement. As a result, the flow of fractions is subjected to an eddy current separator 26, 27, 28 up to three times, which positively influences the separation result. The use of two eddy current separators in a cascade arrangement also considerably improves the separation result, but it has been found that with a third separation device 28 an optimum separation result of a separation of at least 95% of the metal-containing fractions can be achieved. After separating the ferrous fractions in the third phase and the other metallic fractions in the fourth phase, a stream of purified fractions S remains.

Figure 2 shows a flow chart in which the flow chart 20 as shown in Figure 1 is integrated. Figure 2 shows process steps which may precede the steps in the method according to the invention as shown in the flow chart 20.

The flow chart starts with the supply of coarse slag 1 to a magnetic separator 2. The coarse slag 1 is dry slag, the moisture content of the coarse slag 1 being at most 5%. Iron-containing parts are separated from the coarse slag 1 with the aid of the magnetic separator 2. Subsequently, the coarse slag 1 is passed to a screen 3, whereby fractions with a size greater than approximately 200 mm are returned to a waste incineration 4. Fractions with dimensions smaller than approximately 200 mm are passed to a next screen 5, the fractions being separated be at about 60 mm. The fractions that are smaller than approximately 60 mm are fed to a breaker in an A-stream 8. The fractions that are larger than approximately 60 mm are fed in -10- B-stream to a hand sorting or sensor separator 6. Here the nun -ferrous metal-containing fractions separated. Remaining ferrous fractions are then separated in a magnetic separator 7. After the magnetic separator 7, the A-stream and the B-stream of fractions from the screen 5 are combined again and 5 are fed to the crusher 8.

Subsequently, the stream of fractions is supplied to a screen 9, the stream of fractions being separated at approximately 16 mm. The fractions larger than 16 mm are fed to a first circuit with a magnetic separator 10 and an eddy current separator 11. With the magnetic separator 10, the ferrous fractions 10 are separated. The stream of fractions with dimensions larger than 16 mm is then passed on to an eddy current separator 11, the remaining metal-containing fractions being separated. After the magnetic separator 10 and eddy current separator 11, the stream of fractions is returned to the crusher 8.

The stream of fractions with dimensions smaller than 16 mm are passed after sieving in the screen 9 to a second breaker 14. The stream of fractions then leaves the breaker 14 and is fed to a final screen 15 in the flow chart, the stream of fractions is separated at approximately 5 mm. Analogous to the first circuit between the crushers 8 and 14, the flow of fractions with dimensions larger than 5 mm is then separated with the aid of a second circuit with a magnetic separator 16 and an eddy current separator 17. The stream of fractions with dimensions of at most 5 mm is then further processed according to the process steps shown in the flow chart 20 of Figure 1.

Figure 3 then shows an extension of the flow chart, as shown in Figure 2. The flow chart in Figure 3 has been extended with separation units for separating stainless steel and glass. To this end, in the first circuit between the screen 9 and the crusher 8 and the second circuit arranged analogously thereto between the screen 15 and the crusher 14, a stainless steel separator 12, 18 and a glass separator 13, 19. are provided in the circuits between the screen and the breaker passes the flow of fractions first a magnetic separator 10, then an eddy current separator 11, then a stainless steel separator 12 and finally the glass separator 13.

Figure 4a shows a eddy current separator in a side view that is suitable for use in the method according to the invention. The eddy current separator 30 is provided with a supply transport path 31 for supplying the non-ferrous metal-containing fractions. Furthermore, the eddy current separator 30 is provided with a drum with a rotating magnetic roller 33 therein. A separating wall 32 is arranged next to the magnetic roller to effect a separation between fractions ejected from the drum. The drum is positioned at the end of the feed conveyor track 31. During operation, the magnetic roller rotates against the direction of transport of the feed conveyor track. The magnetic roller 33 is made of neodymium and is rotated at a speed of at least 4000 rpm. At such a high rotational speed, the eddy current is furthermore suitable for separating small fractions. The magnetic roller in the eddy current separator's drum is provided with at least 40 poles for energizing the drum. Due to the high rotational speed and the high number of poles, the frequency of the generated alternating magnetic field is very high, so that the eddy current separator is particularly suitable for separating small fractions.

Figure 4b shows a schematic side view of the operation of the eddy current separator of Figure 4a. The direction of the flow of fractions is indicated by an arrow at the supply conveyor. At the end of the feed conveyor, the stream of fractions passes over the drum, in which the magnetic roller 33 rotates. In order to achieve a higher degree of separation, the magnetic roller is preferably rotated counter-clockwise. The fractions passing through the drum will be attracted or repelled by the alternating magnetic field, so that a separation occurs between the fractions.

In addition to the embodiment shown, it is possible to use variants without thereby departing from the scope of protection as defined in the claims. For example, in a variant the method can be applied to finely crushed ore, inter alia originating from gold mines. The method can also be pre-eminently used for separating fine aluminum from aluminum slag (dross).

Claims (18)

A method for separating metallic fractions from slag comprising the successive steps of: - supplying the slag; - processing the slag into fractions; 5. pre-separating the fractions, separating ferrous fractions; - separating non-ferrous metal-containing fractions with the help of an eddy current separator, characterized in that the slag is dry when the slag is processed into fractions, wherein the fractions have a size when pre-separating and separating non-ferrous metal-containing fractions have a maximum of 5 mm. 2. Method as claimed in claim 1, wherein the eddy current separator comprises a supply transport path for supplying the non-ferrous metal-containing fractions and a drum with a magnetic rotor therein, the drum being positioned at the end of the supply transport path, wherein the magnetic rotor during operation the transport direction of the supply transport path is rotated. 3. Method as claimed in claim 1 or 2, wherein a magnetic rotor of the eddy current separator is rotated with a speed of at least 4000 rpm. Method according to one of the preceding claims, wherein an eddy current separator with a magnetic rotor with at least 40 magnetic poles is used. A method according to any one of the preceding claims, wherein at least two eddy current separators are used in a cascade arrangement. 6. Method as claimed in any of the foregoing claims, wherein the fractions with a dimension of at most 1 mm, the so-called fine dust fraction, are separated from the flow of fractions with dimensions of at most 5 mm. Method according to one of the preceding claims, wherein a Neodymium magnet roll of 9000-9500 Gauss is used for pre-separating ferrous fractions. -13- A method according to any one of the preceding claims, wherein the pre-separation of ferrous fractions is performed in a cascade arrangement. 9. Method according to one of the preceding claims, wherein fractions of stainless steel containing steel are separated in a further step. A method according to any one of the preceding claims, wherein glass-containing fractions are separated in a further step. A method according to any one of the preceding claims, wherein fractions with a size of at least 5 mm are further separated into an A stream of fractions of 5-60 mm and a B stream of fractions of at least 60 mm. 12. Method according to claim 11, wherein the B-stream of fractions is broken after a first preliminary separation on metals and sieved to fractions with a size of at most 60 mm. 13. Method as claimed in claim 12, wherein the provisional separation of the B-stream comprises a step in which metals are separated manually and / or a step in which separation with the aid of sensors and nozzles is applied. A method according to any of claims 11-13, wherein the A stream of fractions after a preliminary separation on metals are broken and sieved into a first drain stream of fractions of a size of 16-60 mm and a second drain stream of 25 fractions with a size of up to 16 mm. Method according to claim 14, wherein fractions containing glass and / or stainless steel are separated from the first and second discharge stream. Use of the method according to any of claims 1-15 for use on refuse incineration lacquer from a refuse incinerator. 17. Use as claimed in claim 16, wherein a separation device for carrying out the method is positioned near an outlet of the incinerator for separating fractions from the incinerator with a size of at most 5 mm. -14- 18. Separating device for carrying out the method according to one of claims 1-15.