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Continuous, External Heating Type Rotary Kiln [KURIMOTO, LTD.]

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Continuous, External Heating Type Rotary Kiln

Division for this product Plant Engineering and Machinery Division

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Gas Furnace System Electric Furnace System


This machine is an indirect heating type of rotary kiln using electricity, heavy oil, or gas as the heat source. The shell, due to its equilateral hexagonal cross section, minimizes the "shear" of the material layer to provide a sharp distribution of residence time, enabling you to get stable and high quality products of uneven firing.


  • Equilateral hexagonal shell employed (Refer to Figure-1.)
    Compared to cylindrical shell, this shall provides less "shear" of the material layer, a sharp distribution of residence time, and less uneven calcining, increasing the material holding ratio to make the equipment compact in size.

(Figure-1 Comparison of kiln action)

  • Introduction of superb air sealing performance and special sealing construction enables sealing up to a maximum of pressure of kiln internal pressure±500Pa.
  • Besides oxidized (i.e., in the air) or neutral (i.e., nitrogen gas or carbon dioxide gas) gas, reducing gas can be used.
    Carrier gas or reaction gas can be charged thanks to the improved sealing performance.
  • Severe calcining temperature control enabled
    The calcining temperature is directly measured with sheathed thermocouples inserted in the material layer.
    Introducing the multi-chamber type of electric furnace enables independent temperature control of each chamber.
    The material temperature is selectable up to a maximum of 1000ºC. Furthermore, if you use gas or heavy oil as the heat source, please introduce the hot air circulation system for energy savings.
  • Easy settings of residence time
    The shell speed varies with the use of the variable speed motor (10:1). Furthermore, variable inclination system is also available for the shell.
  • Easy installation
    The retort, heating oven, and feeder are set up on the common platform, facilitating the installation work. Small-sized kilns come with casters (wheels) for relocation use.

Scope of Application

  • Operation
    Drying, pre-calcining, high temperature reaction, and heat treatment
    Superb air-tightness enables application to the high temperature reaction process of various kinds of powders in an acid, neutral, or reducing atmosphere.
  • Heating temperature and material of shell (retort)
    300ºC to 1200ºC
    Various kinds of stainless steel, Inconel, hastelloy, or heat resisting cast iron (Kurimoto Thermalloy) is used for the shell with consideration given to resistance to heat and corrosion.
  • Heat source
    Electricity (standard), gas, or heavy oil
  • Objects
    The rotary kiln is available for the processing of fine chemical materials up to micron order in size including pigments, ferrite, active carbon, carbon black, various kinds of ceramic materials, powder and particles such as industrial chemicals, and pellets.
  • We can support your calcining operation with batch type of rotary kilns.


TypeCapacity (kg/h)D(mm)L0(mm)L1(mm)L2(mm)H(mm)Drive motor
IRK-02 7 250 3700 3200 1800 1450 1.5kW
IRK-03 15 350 4200 3700 2200 1500 2.2kW
IRK-04 30 450 4800 4200 2600 1700 2.2kW
IRK-05 60 550 5700 5000 3300 1900 3.7kW
IRK-06 100 650 6700 5900 4000 2100 3.7kW
IRK-07 150 750 7400 6500 4500 2300 5.5kW

Typical Flow Sheet


Division for this page Plant Engineering and Machinery Division