TECHNICAL FIELD

The machine is intended for use in the chemical industry for the processing of highly contaminated polymeric materials when it is necessary to wash polymers with a porous structure and especially when soaking and multistage chemical treatments is required.

BACKGROUND OF THE ART

Various machines are known in the in the field of polymers washing, each of which is intended for processing-washing of specific materials or for taking place of specific chemical processes. Furthermore, the known machines are mnning on an uninterrupted mode of operation, the washable material being continuously fed into a washing chamber is washed and comes out continuously from the machine after the washing process has been completed.

From the known state-of-the-art to the moment, there is no machine known for the chemical treatment of polymer waste to allows industrial’ ^’ “batch” - type of processing depending on the particular type of material to be treated.

SUMMARY OF THE INVENTION

The problem to be solved by the invention is to create a machine for chemical processing of polymer waste, which allows to carry out an industrial multistage process and its complete automation. The problem is solved by a machine for chemical processing of polymer waste, which includes washing chamber. According to the invention, the washing chamber is formed by a main body comprising an upper cylindrical portion with a cover lid and a lower part with a truncated cone shape, the small base of which is located below. To the small base is mounted a filter housing in which is inserted a filter grid. The filter housing is cylindrical with an upper and a lower flange, and its fitting to the small base of the main body is done by its upper flange with bolt connections. Directly above the lower flange of the filter hqusing is located recirculation oudet connected to a pump, followed by a feeding pipeline of a recirculation circuit; A knife gate valve is fitted to the lower flange of the filter housing. Both the housing - the main body and the filter housing - are covered by the relevant wrapping heat-insulations. Moreover, in the washing - chamber is located a mechanical stirrer made up of opposing tubular elements, to which are fixed inclined blades. The tubular elements have a shape corresponding to the inner shape of the main body and are fitted to a central tubular element. The upper end of the central tubular element is connected to a motor-gear, and its lower end, ending with two radial asymmetrically inclined blades, is located in the filter housing. In the cover lid there is a supply opening for the material processed as well as a water inlet. To the cover lid are mounted at least two pipes which are inclined to the central tubular element and are closed at their lower end and with an upper end located above the cover lid. The lower ends of the inclined pipes are located at a height up to the middle of the lower conical part of the main body and at a distance from one another of at least 1/3 of the diameter of washing chamber at the same level. The pipes have a perforation along the length, the perforation being on the part located in the washing chamber. At least one of the inclined pipes is recirculating and at least another one - solution-feeding.

The recirculation circuit is formed by the recirculation outlet· connected to the pump to which outlet is connected a feeding pipeline, which has a draining deviation to a water preparation and wastewater treatment station and through corresponding valves is connected to the recirculating pipe alternatively - directly and also through a heat exchanger.

It is preferable that the machine also has an automatic control system.

Mechanical stirrer, preferably should have a reverse mode of operation..

It is good to have a ."high level" sensor mounted in the washing chamber to the cover lid.

The advantages of the machine for chemital processing of polymer waste, according to the invention lies ^' in the opportunity that several consecutive chemical treatments in the“batch” process mode could be carried out in the same machine, achieving the highest possible cleansing degree of the polymers, especially those with a porous structure. The machine allows complete automation of industrial processing, draining and replacement or refreshing of the used solutions during processing.

BRIEF DESCRIPTION OF THE FIGURES ·.

Figure 1 is a vertical sectional view of the machine according to the invention; ^· Figure 2 is a view of A-A of Figure 1;

Figure 3 is a schematic diagram of the machine in the operating mode.

EXAMPLES OF EMBODIMENTS OF THE INVENTION ^' .

The machine for chemical processing of polymer waste includes a washing chamber 1. According to. the invention, washing chamber 1 is formed by a main body 2 comprising an upper cylindrical portion 3 with a cover lid 4 and a lower part 5 with a truncated cone shape, the small base 6 of which is located below. To the small base 6 is mounted a filter housing 7 in which a filter grid 8 is inserted, as shown in figure 1. In the example shown, the filter housing 7 is cylindrical with an upper flange 71 and a lower flange 72. The fitting of the filter housing 7 to the small base 6 of the main body 2 is done by the upper flange ^“ 72 with bolt connections. Directly above the lower flange 72 of the filter housing 7 is located a recirculation outlet.9 connected to pump 10 followed by a feeding pipeline 11 of a recirculation circuit 12. To the lower flange 72 of the filter housing.7 is. fitted a knife gate valve 13. It may be a. pneumatic one driven by a pneumatic cylinder or electrically operated. Figure 1 shows an example using a pneumatic knife gate valve. Both housings - main body one 2 and filter one 7 - are covered by a relevant wrapping heat-insulations 14, 15. To fix the machine in the designated place, fitting heels 16 are provided, welded to the main body 2, as shown in figure 2 und figure 3. The fitting heels 16 have the shape, selected by the experienced and accredited specialist in this field and is subject to custom design, and their configuration is not a subject of the invention and will therefore not be considered in detail in the present description. ·

In the washing chamber 1 is situated a mechanical stirrer 17, composed of opposite tubular elements 18; to which are fixed inclined blades 19. In the example shown, the blades have a slope of 45°, but depending on the particular application of the machine and the type of construction, another suitable slope can be selected. In some variants of embodiment and depending on the particular materials being processed the top blades are provided to have a inclination which is reversed compared to the others. The tubular elements 18 have a shape corresponding to the inner shape of the main body 2.and are mounted to central tubular element 20, the upper end of which is connected to a motor-gear 21 for driving the mechanical stirrer 17. The preferred option is the mechanical stirrer 17 to · operate with reversing mode one. Preferably, the rotation speed of its movement is in the range of 2-4 revolutions per minute. The central tubular element 20 has -.a lower end located in the filter housing 7 and ends with two radial asymmetrically inclined blades 22. · ·

In the cover lid 4 of the main body 2 is formed a supply opening 23 for the material processed, as well as a water inlet 24. To the cover lid 4 are mounted at least two inclined relative to the central tubular element 20, tubes 25, 26 with an upper end located above the coyer lid 4. The inclined tubes 25, 26 are closed at their lower ends. Their inclination relative to the central tubular member 20 is 15°, as it is provided in the embodiment, shown in Figure 1. The lower ends of the inclined pipes 25, 26 are located at a height up to the middle of the lower conical part 5 of the main body 2 and at a distance from one another of at least 1/3 of the diameter D of the washing chamber 1 at the same level - middle . of the lower conical part 5. In the specific example, this distance is about 645-655 mm. Tubes 25, 26 have a perforation 27 along the length, the perforation 27 being located in the washing chamber 1. The inclined pipes 25, 26 are designed for feeding of solution and recirculation. Further were used the names - solution-feeding pipe 26 and recirculating pipe 25. Depending on the specific implementation, the perforated inclined tubes can be 2 or 3, wherein at least one of them is a recirculating pipe 25 and at least another one is a solution-feeding pipe 26.

The recirculation circuit 12 is formed by the recirculation outlet 9 connected to the pump 10 to which outlet is connected a feeding pipeline llwhich has a drainage deviation 28 to a water preparation and wastewater treatment station 29. _. Further, the feeding pipeline 11, through corresponding pneumatic (or electromagnetic) valves 30 and manual valves 31, shown with their technical indications in Figure 3, is connected to the recirculating pipe 25 alternatively - or directly through GV1, GV2, GV3 and GV9; or through valves with a technical designation GV1, GV2, GV3, GV5, GV6, GV7, GV8 through a heat exchanger 32 to maintain the temperature in the machine. The heat exchanger 32 is connected to a power station 33. ^'

It is good on the cover lid 4 to be mounted a sensor (not shown) for "high level" in the washing chamber 1. The sensor can be of any type offered, such as wave sensor. As a preferred embodiment, an automatic control system is also included. APPLICATION OF THE INVENTION

The machine works with external heating of the solutions. It is suitable for working with solutions having a hydrogen index pH from 3 to 12 and a temperature from 5°C to 90°C (atmospheric mode of operation). It is recommended that the treated materials have a size from 5mm to 40mm, which provides high-quality chemical treatment.

Typically, the parameters such as a ratio of material to solution; concentration of the solutions to be used for processing; required temperature of the solution; duration of the process are entered in the automatic control system data base.

In the washing chamber 1 of the machine is fed the required quantity of water, and after 30 seconds the mechanical stirrer 17 is switched on and it starts simultaneous feeding of material through the supply opening 23 and a corresponding solution through the solution-feeding pipe 26. Typically, the filling of the washing chamber

1 with material and solution lasts up to 5 minutes. The quantity of material, water one and the solution one fed in ttie chamber are controlled outside the machine.

8

Figure 3 shows an exemplary schematic diagram for machine operating mode.

The material stay in the machine washing chamber 1 and a chemical treatment cycle is executed with the intended first solution. After the required time has elapsed the solution ^' is drained through the recirculation outlet 9, the pump 10 and the drainage deviation 28 of the feeding pipeline 11 to the water preparation and wastewater treatment station 29. In draining mode are open GV1, GV2, GV4 and all other mechanized valves are closed. The second solution, which is usually different from the first one,· then is feeding while the material is Still in the washing chamber 1. In the same order, cleaning with different solutions is carried out in a corresponding number of cycles and the treated material does not leave the washing chamber 1. After the last treatment cycle, the solution is drained and washing chamber 1 is discharged by opening the pneumatically (or electrically) driven knife-valve 13, and the material is removed therefrom. By reversing the direction of rotation of the mechanical stirrer 17, the discharging process is makes easier.

Next, the machine for chemical processing of polymeric waste is charged with a new portion of material to be processed in the order as described above.

When it is necessary to heat the material and solutions contained in the washing chamber 1, the recirculation circuit 12 is switched on via the heat .exchanger 32. In this mode are open: .

- shut-off valves GV1, GV2, GV3, GV5, GV6, GV7, GV8, GVlO, GV11, CV2 and GV12;

- by the CV 1 valve is adjusted the .operating mode of the pump.

- GV4 and GV9 are closed.

The machine according to .the invention makes it possible to carry out a multistage regime with a different duration of the individual treatments, and their total duration determines the hourly capacity of the machine.