Ways to recycle wooden sleepers. Disposal of wooden sleepers: an overview of the various methods

For companies and organizations in the field of railway construction, maintenance of transport networks, there are requirements for the disposal of worn out or unclaimed sleepers. Wooden sleepers today pose a huge threat to the environment, they are abandoned, transferring all railway tracks to concrete bases. But the dismantling of old equipment requires a quality approach to disposal. It is worth considering more closely the reasons for the need for such a process.

Why should railroad ties be recycled?

If the concrete elements of the supporting structure are simply broken and then used in construction for backfilling, then the wooden products must be disposed of in an environmentally friendly way. Previously, such railway waste was simply burned. But today this is unacceptable, since the harm from the emitted substances has been proven and confirmed by research. The main aspects of influence are as follows:

• release of creosote during combustion, significant air pollution with toxic substances;
• infection air masses other toxic compounds of the phenolic group, acetone and other materials;
• combustion of coal oil, which was impregnated with wooden parts of the supporting structure;
• incomplete processing of some chemical elements, subsequent pollution of the landfill.

All this leads to the fact that during active processing with the help of simple combustion, the sleepers continue to pollute the environment without forming solid waste. Today there are more adequate approaches to the disposal procedure wooden sleepers, while the price of the process remains affordable, and the company, upon completion, must issue a complete package of documents to the customer.

Sleeper disposal - the main tasks of a complex process

There are several options for chemical treatment of products before destruction. These procedures are carried out to neutralize the main harmful substances. With the help of pyrolysis, for example, some resins are completely neutralized and chemical substances which are not destroyed by combustion. With professional disposal of wooden sleepers, you can get the following results:

• absolute destruction of all unacceptable for nature chemical compounds before processing;
• shredding wood residues that no longer pose a significant risk to environment;
• destruction of all solid residues by incineration in special furnaces without air pollution;
• the use of methods of accelerated decomposition with the addition of reagents for destruction without access to oxygen.

All of these processes are used by professional hazardous waste disposal companies. Sleepers belong to the third class of substances according to the danger of environmental pollution. This is toxic waste from transportation networks that needs to be recycled. The need for such processes is also indicated by law, and there are a number of sanctions and fines for violation of such requirements.

We order high-quality processing of sleepers from railway

In the company "ECOUMWELT" you can order the processing of any waste from the transport or industrial sector. We are ready to accept the most dangerous and toxic materials and completely neutralize their potential risk to the ecosystem. Order the disposal of railway sleepers with a full package of papers and acts for future inspections. We carry out all actions legally, we base our work on the principles of environmental protection. You can ask all questions by phone.

Removal, processing and disposal of waste from 1 to 5 hazard class

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We all know firsthand what railway sleepers are. These are supports for the rails that are used when laying railway. Various materials are used for the production of sleepers. Thus, sleepers can be divided into several categories according to the type of material:

• Wooden.
• Reinforced concrete.
• Steel.
• Plastic.

Wooden railway sleepers

This category is the most subject to wear and tear. Their resource is approximately 7 - 40 years, depending on the wood and loads. The tree has its advantages: it is easy to process, elastic, is a dielectric, that is, does not conduct electricity, almost does not respond to temperature changes. But there are also disadvantages: the tree is prone to decay, especially at the junction with the rails.

Pine, spruce, fir and cedar are used for production. In order for the supports to last longer, they are impregnated with ZhTK antiseptics or oils.

More durable look. They are made using concrete and reinforcement to increase the strength of the supports. In the manufacture, the method of tensioning the reinforcement is used, which in the process transfers stress to the concrete. Thus, reinforced concrete products are produced that have high strength. Thus, their service life is not limited.

But this product also has disadvantages: since this type of sleeper is made from reinforced concrete, they have big weight, which is impractical, there is also the possibility of concrete fatigue cracking.

Steel sleepers

Made from bent profile. The undoubted advantage is the low weight. But, as you know, metal is highly susceptible to corrosion. Therefore, in temperate climate such supports are not used. They are used in countries with arid climates, such as Morocco. They are used in steelmaking, as they are resistant to loads and high temperatures. There, wooden ones can burn out, and reinforced concrete ones can delaminate.

Plastic sleepers are an innovative product rarely used on high speed roads in Japan.

Disposal and recycling of sleepers

Every year on the railways remains a large number of decommissioned railroad pylons. Consider recycling wood.

Since they are saturated with oils, which are toxic substances, such sleepers are classified as hazard class 3. They are disposed of in the following ways:

1. They burn it, but the environment is damaged, as the tree is saturated with toxic substances.
2. subjected to gasification. With this method, the degree of neutralization is increased.
3. Pyrolysis - exposure to high temperatures without air access. Prevents emissions of harmful substances into the atmosphere.
4. Recycling - this refers to the neutralization of toxic substances with which wood is impregnated and its subsequent processing, for example, into charcoal.

As for the disposal of reinforced concrete supports, it all comes down to their processing. Recycling of reinforced concrete provides a large amount of secondary raw materials. Used or substandard reinforced concrete products are subjected to crushing in special installations. In this process, the concrete is processed with the separation of metal reinforcement from it.

Sleepers. The problem of recycling and methods for solving it

The most important conditions of the strategic development of railway transport until 2015 are a fundamental increase in the efficiency of Russian Railways in a market economy, labor productivity should approach the level of this indicator of the world leaders in railway transport, the introduction of high standards of labor organization, the use of resource-saving technologies in the repair of infrastructure, the dissemination of technologies , excluding the participation of people, and improving the quality of track repair through the introduction of innovative solutions, the use of track machines with high productivity and low repair capacity, the creation of monitoring tools for track facilities.
Every year, after the repair of railway tracks, a huge amount of reinforced concrete and wooden sleepers that have served their time are accumulated. For all types of repairs, about 600 thousand reinforced concrete sleepers are removed from the track, unsuitable for re-laying on the road, and 10,000 thousand wooden sleepers, with the current content of 5,000 thousand wooden sleepers.
For the disposal of reinforced concrete and wooden sleepers, complexes KUSh-40 and KUSh-30 have been developed, respectively. Annual productivity when working in one shift KUSH-40 - 80 thousand units, KUSh-30 - 60 thousand units. Until 2015, 15 complexes are required for the processing of unusable reinforced concrete sleepers, and 132 complexes for wooden ones.

Previously, most of the sleepers that had served their time were sold to the population for the construction of houses. Today, at best, sleepers are stored on the territory of track facilities, which requires additional financial costs. The worst option is that old sleepers are scattered along the tracks. They clog the right of way, interfere with the work. And for train passengers, piles of reinforced concrete on the side of the road are not the most pleasant sight.

For the railway industry, the problem of recycling used wooden sleepers is currently the most acute, which is due to the use of various antiseptics against decay as an impregnation, which makes them environmentally hazardous. Due to harmful impurities, namely such a dangerous toxic component as creosote, the utilization of sleepers by direct combustion is impossible. In Europe and the United States, environmental damage from open warehouses of materials containing toxic components is punishable by large fines.

On the territory of the Russian Federation due to the overflow of regional landfills industrial waste a huge number of used wooden sleepers with hazard class 3 are stored unauthorized in open areas not provided for this. Legislation Russian Federation for causing environmental damage to the environment provides for strict administrative liability and huge penalties, which are constantly becoming tougher, to the owner of the waste.

The problem of utilization of sleepers on the road network has not yet been systematically solved. Because of this, one has to deal with sleepers that are already in the right of way and at the bases of the track complex of roads and are annually removed during track repairs (Table 1). At the same time, it is supposed to select sleepers for their subsequent repair and return to the road. The estimated volume is at least 3,500-4,000 thousand sleepers per year, not counting those already accumulated at the bases of the track complex and in the right of way (up to 70 million pieces).

Table 1. The number of wooden sleepers on the road network of Russian Railways

Sleeper disposal methods

At present, common methods and technologies for the disposal of old-year wooden sleepers have been developed and are being used, presented in Table. 2.
On the instructions of the North Caucasus Road, the Department of Life Safety and the Research and Production Ecological Laboratory of the Rostov state university ways of communication carried out an analysis of existing domestic and foreign methods of utilization of sleepers. The data obtained show that the main recycling activities include technologies for thermal neutralization, chemical immobilization, localization of pollution sources, biochemical and biothermal utilization, the use of new antiseptic materials and recycling of materials.

Thermal neutralization technologies are currently the most developed. Among the existing methods, preference is given to pyrolysis, since it allows not only to eliminate and neutralize waste, but to regenerate energy and materials. The removal of sleepers to landfills and dumps, their sale to the population and their use in construction are unsuitable because they are harmful to human health and the environment.

The most well-known foreign technologies for solid waste pyrolysis include the Tarrax method (USA), which consists in carrying out pyrolysis with the supply of air heated to 1100 °C. At a temperature in the combustion zone of 1650 °C, pyrolysis gas contains about 62% nitrogen and has a very low calorific value (3-3.7 MJ/m3). Another method of high-temperature pyrolysis Purox (USA) involves the use of oxygen instead of air for gasification, which makes it possible to obtain gas undiluted with nitrogen with a calorific value of 11-13 MJ/m3. Both methods involve the use of high temperatures for liquid ash removal, which facilitates the processing of solid waste. The system, developed by American companies Conrail and Koppers Industries, uses the steam generated by burning old sleepers to process wood and generate electricity.

The German company Eisenmann offers new rotating drum reactors for drying, gasification, pyrolysis or incineration of various wastes with a capacity of 200 to 2000 kg/h. The reactors are equipped automated systems, allowing to regulate the supply of oxygen to the working space. There are also systems for cleaning exhaust gases in the afterburners.

In 1985, Industrial Quality Recycling (IQR) was established in Sweden, specializing in the disposal of wood waste, including wooden sleepers, unsuitable for laying on the road. A plant with a capacity of 135 thousand tons or 15 t/h for the disposal of wood waste impregnated with creosote was built in the city of Trollhetan. Unusable wooden sleepers coming from Sweden, Norway, Germany, the Netherlands, Switzerland, France and Italy are sorted, metal parts are removed from them, then crushed and burned in special steam boilers. At the same time, up to 12.3 MW of electricity and 10.6 Gcal of heat are received in the form of hot water. Eight such plants have already been built in Sweden. Plant emissions exceed the Russian standard for carbon monoxide by 16-30 times, for sulfur dioxide - by 2000 times, for nitrogen oxide by 3000 times, for mineral dust by 10 times, for benzapyrene by 10-100 times.

From domestic developments, the incinerators of JSC "Turmalin" from St. Petersburg, the installation of NPO "YarEnergoMash" from Yaroslavl and the installation of solid waste disposal "Echuto", manufactured by JSC "Company Slavich" on the basis of the project of JSC "ENIN im. G.M. Krzhizhanovsky. Since 1985, VNIIZhT has been developing installations for the pyrolysis treatment of oil waste (garbage contaminated with oil products, rags, oil sludge from washing machines, used oils and lubricants). The productivity of the pyrolysis plant was 50 kg/h. This technology did not receive recognition, but found its continuation in the developments of JSC "Tourmaline".

JSC "Turmaline" incinerators cover a wide range of recyclable waste, including old wooden sleepers. Combustion capacity - from 50 to 1000 kg/h. In the standard delivery, the incinerators are equipped with dust collectors for sequential flow separation, in which, due to
internal nozzles and a specific central part, the exhaust gases are cleaned of dust up to 90-93% by saturators for wet cleaning. In addition, they are equipped with waste heat boilers. The most suitable for the disposal of old wooden sleepers is the IN-50A incinerator with a capacity of up to 150 kg of waste per hour in combination with a waste heat boiler, dry and wet cleaning of exhaust gases.

NPO YarEnergoMash proposes a project for a plant for the disposal of old sleepers with a capacity of 10 tons / day with thermal decomposition of waste using high-temperature pyrolysis. For thermal destruction solid waste, the technology created by JSC ENIN im. G.M. Krzhizhanovsky. It consists in indirect, two-stage combustion, including preliminary thermal decomposition of the organic part of the feedstock, combustion of gaseous products and afterburning of the coke residue. On the basis of these developments JSC "Company Slavich" manufactures installations for environmentally friendly waste disposal "Echuto 150-02" and "Echuto 150-03". They are designed for local processing of rags, paints, rubber products, plastics, etc. Old wooden sleepers can also be destroyed using this technology.

One of the directions, not related to recycling technologies, but allowing to reduce environmental pollution, is the use of new antiseptic materials. The antiseptic composition protects wood from destruction by microorganisms, increases strength, as well as moisture and chemical resistance, reduces cracking and can replace antiseptics of coal origin. The advantage of oil antiseptic is a low degree of toxic effects on the human body. This direction is being studied at SamGAPS in cooperation with specialists from the Ufa State Technical University.

In countries Western Europe given great attention recycling materials. The European Association for the conversion of plastics suggests making chipboard from sleepers. When processing old chipboard and fiberboard, the boards are crushed, treated with wood-destroying mushrooms and hot alkali, and then pressed with the addition of a binder.

Joint venture "Olnova" together with its partner company "Kriger", a manufacturer of modern boiler equipment, offers to use crushed sleepers for burning in solid fuel, heating and hot water boilers. It is known that the disposal of sleepers by direct combustion is impossible due to the presence of harmful impurities in them and a particularly toxic component of the filler - cresol. Krieger specialists, with the help of a number of reputable laboratories and research institutes working in the field of environmental protection, have obtained preliminary positive results from the use of crushed sleepers as fuel and their compliance with EU Directive 94/67 of December 16, 1994 on the combustion of harmful waste. This became possible due to the optimization of the operating modes of the boiler units. In the future, it will be possible to effectively use the old sleepers for heating industrial and residential premises.

For crushing railway sleepers without preliminary separation of metal plates and crutches, a specialized crushing machine VB-750 DK with a capacity of up to 25 t/h is offered. During crushing, metal products are simultaneously separated from wood using a magnetic separator. To obtain chips, you can use NZS type regrinders or a DP-660 P impact crusher.

Disposal of railway sleepers is one of the most global problems transport industry. Despite the fact that the main material of the sleepers is wood, they cannot be called safe due to various chemical impregnations (most often it is poisonous creosote). If disposed of incorrectly, this substance can harm not only the environment, but also human health. Our company offers high-quality and inexpensive services for the disposal of sleepers throughout Russia.

Recycling process

The simplest and most popular way to dispose of wooden railway sleepers is incineration. At the same time, due to the harmful substances released from the impregnation, it is still not completely safe. Gasification is more acceptable - the process of converting fuel into a pulverized stream. Another equally popular and absolutely safe method– pyrolysis. To date, this is the most promising way to dispose of railway sleepers, in which there are no emissions into the atmosphere. In addition, pyrolysis is very beneficial for enterprises, since in the future it is possible to use products obtained during processing (fuel, gas, coal).

Sleeper disposal: problems and solutions

The problem of disposal of sleepers impregnated with oil antiseptic is growing every year. Due to the overcrowding of regional landfills, railway departments quite often store sleepers in places not intended for this. This in turn can cause global environmental problems. In addition, such unauthorized burial is prohibited by law. Utilization of wooden sleepers used closes life cycle product, and can also serve as an alternative source of energy.

The cost of recycling wooden sleepers

Disposal of impregnated sleepers is more expensive than without a septic tank. This affects the final cost of the service. In general, our company offers a decent level of work at an affordable price. The cost of recycling wooden sleepers depends on several factors:

• Remoteness of the place of sampling of raw materials;
• The chosen disposal method;
• Degrees of processing;
• The volume of raw materials.

In order to clarify the cost - contact our managers in any way convenient for you. We value every client and will be happy to answer all your questions.

Our advantages

The company "Eco Architecture" has been working in the field of industrial waste disposal for many years and has the appropriate license. We employ experienced, highly qualified specialists who quickly and efficiently perform their work. Today, we are actively developing and successfully implementing numerous waste disposal projects throughout Russia. We guarantee our clients flexible pricing and individual solutions to their tasks.

The company "Eco Architecture" is equipped with modern, imported equipment for recycling hazardous waste and has its own car park. That is why, if you are looking for a plant for the disposal of railway sleepers - do not waste time, call us right now. We care about the preservation of the environment and strive to improve the environmental situation in the country.

The invention is intended for the processing of used and obsolete reinforced concrete sleepers. The complex for recycling reinforced concrete sleepers contains a crushing plant, made with a receiving and output trays and installed at an angle of 50° to the horizontal plane on the foundation truss. Under the output tray of the crushing plant, there is an unloading conveyor for transferring the crushed mass to an intermediate conveyor. An iron separator is provided at the end of the discharge conveyor. Under the unloading end of the intermediate conveyor there is a side conveyor, through which the crushed mass enters the screen, where it is divided into three fractions and enters the bunker, made with three compartments, and a dump conveyor is located under each compartment. The complex contains a second crushing plant for the crushed mass, which has not passed through the screens of the screen, which rolls under the influence of the vibration of the screen into the receiving tray of the second crushing plant, then through the output tray of the second crushing plant it enters the return conveyor and returns to the vibrating screen again through the side conveyor. EFFECT: invention makes it possible to increase the efficiency of utilization of reinforced concrete sleepers. 2 ill.

The complex for the utilization of reinforced concrete sleepers in railway transport belongs to the field of railway transport, namely to assistive devices concerning the processing of used and expired reinforced concrete sleepers, and can be applied in places of mass storage of obsolete sleepers.

From the prior art, a stone crusher is known, which allows crushing stone into fractions of various sizes and consisting of a crushing plant, a screen and a hopper located underneath. In this stone crusher, the stone is thrown into the mouth of the crusher, and then the already crushed stone enters the screen and is distributed among the bunkers (see SU 54075, publ. 01/01/1938). This stone crusher is accepted by the applicant as the closest analogue of the proposed technical solution.

The disadvantages of the stone crusher mentioned above are, first of all, the inability to process long products made of stone, concrete, and even more so to dispose of standard reinforced concrete sleepers having a length of 2700 mm, and in which steel wire with a diameter of 3 mm is used as reinforcement, with a nominal number in the sleeper - 44 .

The present invention is aimed at increasing the reliability and ease of use of the complex through the implementation of the complete utilization of sleepers with the production of building rubble and cleaned scrap of reinforcing steel, as well as performing operations in a closed environmentally friendly cycle, which differ low level noise and dust, as well as the absence of harmful emissions into the atmosphere.

The specified technical result is achieved due to the fact that the complex for the recycling of reinforced concrete sleepers in railway transport contains a crushing plant, a screen and a hopper located underneath, and according to the invention, the crushing plant is made with a receiving and output trays and is installed at an angle of 50 ° to the horizontal plane on the support foundation truss, under the crushing plant output tray there is an unloading conveyor for transferring the crushed mass to the intermediate conveyor, at the end of the unloading conveyor there is an iron separator that separates reinforcement and other from the crushed mass metal objects, and under the unloading end of the intermediate conveyor there is a side conveyor, through which the crushed mass enters the screen, where it is divided into three fractions and enters the bunker, made with three compartments, and under each compartment there is a dump conveyor, while the complex contains a second crushing plant for crushed mass that has not passed through the screens, which rolls under the influence of the vibration of the screen into the receiving tray of the second crushing plant, then through the output tray of the second crushing plant enters the return conveyor and returns again to the vibrating screen through the side conveyor.

These features are essential and interconnected with the formation of a stable set of essential features sufficient to obtain the desired technical result.

The analysis of technical solutions showed that none of them contains both the entire set of essential features of the proposed complex for the utilization of reinforced concrete sleepers in railway transport, and distinctive features, which allows us to conclude that the proposed complex for the utilization of reinforced concrete sleepers in railway transport has a "novelty ” and corresponds to the “inventive step”.

The essence of the claimed invention is illustrated by drawings.

Figure 1 shows a general complex recycling concrete sleepers, figure 2 - top view.

The complex for the recycling of reinforced concrete sleepers in railway transport contains a manipulator (1), with the help of which the sleepers are fed into the receiving tray (2) of the crushing plant. The crushing plant (4) is located at an angle of 50° to the horizontal plane at a height of two meters on a foundation truss (3) specially designed and manufactured for this purpose. The crushing plant is made with a receiving (2) and output (5) trays, and under the latter there is an unloading conveyor (7) for transferring the crushed mass to the intermediate conveyor (8). An iron separator (6) is provided at the end of the unloading conveyor, which separates reinforcement and other metal objects from the crushed mass. Under the unloading end of the intermediate conveyor (8) there is a side conveyor (9), through which the crushed mass enters the screen (10), where it is divided into three fractions: 0-5 mm, 5-20 mm, 20-40 mm and enters the bunker (11), made with three compartments, and under each compartment there is a dump conveyor (12). For crushed mass with dimensions of more than 40 mm, which did not pass through the screens, the complex contains a second crushing plant (13). This crushed mass (crushed stone) not screened in the screen rolls under the influence of the vibration of the screen (10) into the receiving tray of the second crushing plant (13), and the output tray of the second crushing plant is located above the return conveyor (14). Thus, a closed cycle of sorting and crushing is formed.

The operation of the complex for the utilization of reinforced concrete sleepers in railway transport is carried out as follows.

Used and obsolete reinforced concrete sleepers are delivered by a loader or platform to the area of ​​the manipulator (1). With the help of a manipulator (1), the sleepers are fed into the receiving tray (2) of the crushing plant, through which, under the action of gravity, they enter the crushing plant (4). In the crushing plant, the crushing process (4) is carried out, for example, with a jaw crusher. Under the action of the complex movement of the corrugated plate in the crushing plant, the concrete mass of the sleeper is destroyed into crushed stone and the metal products (reinforcement) are separated from the concrete. The crushed mass (crushed stone) with the sizes of parts from 0 to 120 mm and the metal (reinforcement) separated from it with a length of 2700 mm enters through the output tray (5) of the crushing plant to the unloading conveyor (7), which supplies the crushed mass (crushed stone) to the intermediate conveyor (eight). An iron separator (6) is installed at the end of the unloading conveyor, which separates reinforcement and other metal objects from the crushed mass (crushed stone). The crushed mass (crushed stone) cleaned from metal objects (reinforcement) along the side conveyor (9) enters the vibrating screen (10), where it is divided into three fractions: 0-5 mm, 5-20 mm, 20-40 mm and enters the bunker ( 11), made with three compartments. A dump conveyor (12) is brought under each compartment. The crushed mass (crushed stone) larger than 40 mm, which has not passed through the screens of the screen (10), rolls down as a result of the vibration of the screen into the receiving tray of the second crushing plant. The mass (crushed stone) crushed in the second crushing plant (13) through the output tray of the second crushing plant (13) and the return conveyor (14) is re-entered for sorting into this vibrating screen (10), where it is divided into three fractions and enters the hopper (11) . Thus, a closed cycle of sorting and crushing of the destroyed concrete sleeper mass is formed.

The main product of reinforced concrete sleepers processing is crushed stone. The crushed stone of three fractions (0-5 mm, 5-20 mm, 20-40 mm) obtained after separation in a vibrating screen complies with the state standards of the Russian Federation (GOST 8367-93), which allows it to be used in the future in road construction, as well as for the preparation of concrete mixtures for various purposes. Crushed stone with a fraction of 0-5 mm contains up to 20% of unbound cement, which significantly increases the strength of concrete mixtures when using this crushed stone as a filler.

Sleepers are accepted for crushing without prior preparation, so this plant allows you to dispose of sleepers as a whole, without first splitting it into parts.

The use of a complex for the recycling of reinforced concrete sleepers in railway transport will make it possible to recycle used and obsolete reinforced concrete sleepers, which vivo practically do not decompose.

The use of the complex for the recycling of reinforced concrete sleepers in railway transport will make it possible to refuse the cost of allocating land for the storage of these sleepers, as well as to return up to 90% of waste in the form of building rubble, scrap, reinforcing steel and building materials obtained using products to the production and economic cycle. recycling of used sleepers.

In addition, the claimed complex for the recycling of reinforced concrete sleepers can be located in close proximity to settlements, because it has a low level of noise and dust, as well as the absence of harmful emissions.

The present invention is industrially applicable and can be manufactured using conventional technologies and materials used in the art.

A complex for the utilization of reinforced concrete sleepers in railway transport, containing a crushing plant, a screen and a hopper located under it, characterized in that the crushing plant is made with a receiving and output trays and is installed at an angle of 50 ° to the horizontal plane on the support-foundation truss, under the output tray of the crushing plant of the plant, there is an unloading conveyor for transferring the crushed mass to the intermediate conveyor, at the end of the unloading conveyor there is an iron separator that separates rebar and other metal objects from the crushed mass, and under the unloading end of the intermediate conveyor there is a side conveyor, through which the crushed mass enters the screen, where it is divided into three fractions and enters the hopper, made with three compartments, and under each compartment there is a dump conveyor, while the complex contains a second crushing plant for crushed mass that has not passed through the screens of the screen, which under the influence of vibration of the screen into the receiving tray of the second crushing plant, and under the output tray of the second crushing plant there is a return conveyor for supplying the crushed mass through the side conveyor to the screen.

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Recycling complex for reinforced concrete sleepers in railway transport