Industrial furnaces
Industrial furnaces ONEJOON Rotary Kilns Kiln technology for every challenge
Powders & Advanced Materials ONEJOON Pyrolysis Processes

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Robust & versatile – the ONEJOON rotary kiln

A powerful all-rounder

The rotary kiln made by ONEJOON is the optimal solution for processes and applications where high mass throughputs are to be homogeneously heat-treated under high temperatures. This industrial furnace is the tool of choice for the recycling of different materials through pyrolysis. The robust design of the rotary kiln allows for the processing of diverse raw materials at a variety of atmospheres. Thus, powdery and lumpy materials as well as suspensions can be treated equally.

Top features of the ONEJOON rotary kiln

  • versatile applications
  • simple operation
  • continuous and discontinuous (batch) operation – depending on design also in the same plant
  • air and protective gas atmospheres selectable
  • ONEJOON's patented gas- and dust-tight sealing system allows processing of harmful substances
  • modularized furnace concept

More than 125 years of experience in heat treatment make ONEJOON your reliable partner for the development of innovative processes. In our in-house Test Center, we develop new ways of process control on request, always in close cooperation with our customers. In order to quickly implement total solutions, we supply products for the entire process chain, from the rotary kiln, to the filling and cooling systems, to the discharge technology.

Your ONEJOON expert

I am Christian Eckart, your expert for rotary kilns here at ONEJOON.
If you have any questions or need further information, please do not hesitate to get in touch.

I'm looking forward to your message!

Contact your ONEJOON expert
Eckart Christian
Christian Eckart Key Account Manager Recycling & Powder Chemicals +49 551 820 830 - 715 Connect with me on LinkedIn

Processes in the ONEJOON rotary kiln

A wide variety of processes can be realized with an ONEJOON rotary kiln. These processes can be run continuously or discontinuously (batch-operation). For example:

Reifen 640x560 Added value thanks to the rotary kiln: used tires can be recycled into recovered Carbon Black (rCB) and oil by pyrolysis.

Technical data & function of the rotary kiln

Industrial furnace for treating powders and granules

  • Furnace head with modular ports for integrating various types of product feeding equipment.

    Here: Filling of the furnace via water-cooled charging conveyor screw. Frequently used alternatives are vibratory conveyors or simple conveyor chutes.

  • The inlet area represents the first system boundary to the process chamber and is usually designed with a furnace head and seal. In order to meet the increasingly high demands for tightness, we rely on ONEJOON'S specially developed, patented, technical gas- and dust-tight sealing system.

    For convenient maintenance work, the components in this area can be designed in a mobile way to better access the drum and some of the wearing parts. Furthermore, connections for process control and monitoring are installed here. The required measuring devices, instruments, and other "peripherals" are selected according to customer requirements.

  • Temperature: Standard solutions for T ≤ 1200 °C and customized solutions for T > 1200 °C

    Material: stainless steel, Inconel, centrifugal casting, advanced materials (quartz glass, carbon-based)

    The rotary tube is the heart of the kiln. Since it integrates the function of heat and mass transfer, it is often the only moving element of the kiln. Its robust design enables the thermal treatment of various products with differing mechanical and chemical properties. Thus, rotary kilns are used for powdery educts, solids, and viscous suspensions.

    In many industries, the rotary kiln's simple operating principle is confronted with high demands on material properties and behavior. Thus, a wide variety of phase transformations, chemical reactions, and heat and mass transfer processes have to be carried out reliably, without exceeding the tube's critical material values or causing unwanted reactions between the tube and the material bed.

    To ensure product quality at maximum plant safety, ONEJOON focuses on application-specific and customer-specific tube materials, geometries, and process parameters. Thus, inclination angle, speed, tube internals, and filling degrees are designed according to customer specifications.

  • ONEJOON rotary kilns can be designed for temperatures up to 1,200 °C. For special applications, temperatures up to 2,000 °C are also possible. Heating is realized either by electric heaters, gas burners, or an upstream combustion chamber.

    We deploy an integrative system to optimize the entire plant's energy efficiency, thus considering increasingly strict limits, regulations, and growing environmental awareness. This is done by improving the design - based on mechanical and fluidic simulations - as well as operating more efficiently - by using heat exchangers, insulation, and secondary fuels.

  • The rotary drum furnace's heated area is enclosed by the kiln body, an outer housing, and a refractory lining. The furnace body and housing are made of steel or heat-resistant sheets. The refractory lining often consists of heat-resistant fiber insulation that allows surface temperatures below 60 °C. Alternative insulation materials such as vacuum molded parts or stones can be used in a complementary way.

  • Depending on the value-added chain, the product must be cooled before being transferred to the next process step or stored. In principle, various types of media can be used for cooling. In industrial practice, however, an air or water-cooled system is the rule. A combination of both concepts is also possible. ONEJOON uses a cooled drum or other indirectly cooled conveying systems, such as a vibratory conveyor, depending on the application.

  • The furnace is mounted on a base frame to reduce external shocks and achieve maximum stability. By utilizing discrete or continuous mechanisms, the frame can be adjusted in height and inclination. On customer request, this can be automized using a spindle lifting system.

  • Continuous and trouble-free drum rotation is safety-critical due to the high temperatures and the resulting drum tensions. For particularly critical processes, ONEJOON relies on diversified redundancy, using secondary engines. An electric motor with a chain hoist generally functions as the main drive.

  • The outlet area is the last system boundary between the process and heating room and the environment. The product discharge channel is an additional component that discharges the heat-treated product from the process area. Depending on the process, this can be done via simple conveyor systems or highly complex systems, including atmosphere exchange and emergency discharge for products with deviating product quality.

Technical data of the rotary kiln

Learn more about the possible specifications here. We will also be happy to advise you on other possibilities.

Rotary drum materialStainless steel, Inconel, centrifugal casting, carbon-based, quartz glass
Rotary drum diameter300 - 1,800 mm
Heated rotary drum length2,000 - 16,000 mm
Operating temperatureup to approx. 2000°C
Potential furnace atmospheresnitrogen, hydrogen, air, other gas mixtures, e. g. pyrolysis gas
Throughput ratesup to 3,000 kg/h
Heating typeindirectly, gas or electrically heated, alternatively also via heat recovery
Process managementcontinuous, discontinuous (batch operation) or combination possible
Othergas and dust tight, direct downstream cooling

Technical highlights – that's why the ONEJOON rotary kiln is your best choice

Benefit from these advantages:

  • single-chamber or multi-chamber sealing system
  • technically gas- and dust-tight
  • heating electrically, burner heated or via hot gas (combustion chamber)
  • time optimized maintenance and cleaning concept
  • temperature measurement directly on the product possible
  • variable process gas discharge and supply inside the furnace possible
  • operation with flammable and non-flammable gases
  • direct or downstream product cooling
  • on request metal-free product handling in the furnace and the periphery
  • modular design for flexible adaptation to a wide range of requirements and materials
  • higher plant availability for pyrolysis processes through individually designed process optimization / process control
  • Heat recovery by using exhaust gases from a combustion chamber and thus reduced CO2 emissions (green footprint)
  • ONEJOON is your partner for the design of complete solutions that go beyond the furnace and the directly adjacent periphery (Turn-Key Solution)

Satisfied customers and references

These rotary kiln systems give you an insight into our broad portfolio. Your individual process requirements are always in focus.

Furnace plants for the calcination of different products

Data & Facts

  • Customer: German company from the chemical industry
  • Product: powder for chemical application
  • Plant: calciner with downstream cooling
  • Scope of supply: 3 Rotary Drum Furnaces including filling, emptying and downstream cooling
Onejoon Drehrohrofen Teaser Quadrat 640x560
Calcination of chemical powders hazardous to health

Data & Facts

  • Customer: internationally operating company
  • Product: powders hazardous to health
  • Plant: 4.5 m heated with directly flanged cooling pipe
  • Filling: screw conveyor
  • Temperature: 1100 °C
Drehrohrofen Vorne Unscharf

Test your process in the rotary kiln

The ONEJOON experts from our in-house Test Center support you with a variety of test options

Our Test Center has a gas-tight test rotary kiln with a heated length of 3,000 mm, a diameter of 300 mm, and a maximum kiln temperature of 1,100 °C, thus offering a wide range of experimentation opportunities and short and long-term tests under production-like conditions. Even an upscaling from laboratory scale to production scale is possible.

In addition, a test rotary kiln is available for cold tests, which can be used to determine dwell times or analyse product behaviour (mixing, caking).

Technical details:

  • Vibratory feeder for material feed
  • Tube dimensions 1500 x 200 mm

Special features:

  • Use of different pipe materials possible
  • Use of internal fittings possible
Test Rotary Kiln
Test Rotary Kiln for Cold Tests
Test Rotary Kiln and Test Rotary Kiln for Cold Tests

Our services

Consulting, service, furnace construction and much more.
Just because every customer has special requirements.

Together with our customers, we develop new furnace concepts and then reproduce them in an initial engineering contract. Especially for new developments, this approach in connection with further tests and simulations offers the possibility of risk minimization and time savings in longer-term decision phases.

Our engineers and process technicians are able to develop solutions for pure furnace concepts as well as for turnkey projects. We are also happy to take over the modification and optimization of existing plants for you. The respective scope and degree of detail are to be agreed on a project-specific basis.

Together with you, we will work out the optimal solution for your request.

  • definition of the scope of delivery
  • design of the system based on your specifications
  • configuration of the system from standardised components, customer-specific adaptations
  • presentation of the plant concept
  • preparation of the offer
  • design, production and testing of the system in our factory
  • shipping, assembly, commissioning and acceptance of the plant at your location around the globe
  • preparation of the plant documentation and the CE declaration of conformity
  • poduction support
  • services: plant maintenance, spare parts, repairs, measurements
  • network to adjacent processes
Porträt Christian 2

Do you have further questions?

I will be happy to answer them personally. Just give me a call or send me an e-mail. If you are interested, we can also arrange a visit to our production facility so that you can experience next-generation industrial furnace technology made by ONEJOON up close.

Contact me now
Eckart Christian
Christian Eckart Key Account Manager Recycling & Powder Chemicals +49 551 820 830 - 715 Connect with me on LinkedIn
ONEJOON Service Technischer Support Grafik 840x560


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Test Center

Development and optimisation of heat treatment processes read more
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125 years of expertise in industrial furnace construction

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Christian Eckart Key Account Manager +49 551 820 830 - 715
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