Roller Hearth Kiln

Roller Hearth Kiln Specification

Fuel: electricity, natural gas

Heating element: upper and lower silicon carbon rods

Transmission mode: helical gear segmented frequency conversion speed regulation

Application: lithium battery cathode and anode materials, rare earth, building ceramics, magnetic material raw materials, etc.

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The roller hearth kiln(RHK) is a continuous sintering industrial kiln that transports materials through ceramic rollers. The products are placed on multiple closely spaced rods, and the products are transported from the kiln inlet to the kiln outlet by relying on the rotation of the rods. The roller hearth kiln is a high-efficiency kiln with high output and low energy consumption. Originally used in architectural ceramics, in recent years, it has been widely employed in industries such as lithium battery cathode and anode materials, rare earths, magnetic materials, electronic powder materials, and electrical porcelain components.

The roller hearth kiln adopts the rolling friction working method, so it will not affect the length of the kiln. In theory, the kiln body can be infinitely long. Moreover, the kiln cavity structure is reasonably designed, and the consistency in the firing product room is better. The large kiln chamber structure is more conducive to the movement of the internal airflow and the drainage and degassing of the products, making it the preferred equipment for large-scale production and a true alternative to pusher kilns.

High-capacity RHK Kiln for Sale with Uniform Heating at 1300℃ Celsius and Rapid Sintering

The high-temperature roller hearth kiln uses silicon carbide rods, spiral helical gear multi-stage transmission, and variable frequency speed regulation. Since the rods are made of recrystallized silicon carbide, the roller hearth furnace temperature can reach a maximum of 1350 degrees Celsius. The upper and lower Rhk kiln parts can heat the materials simultaneously, achieving uniform temperature distribution.

Inside the roller hearth kiln, materials are transported in a high-speed and stable manner, and the heat transfer rate is fast, resulting in uniform cross-sectional temperature distribution, thus ensuring the rapid completion of the sintering process. The roller hearth kiln features highly automated characteristics, effectively reducing the uncertainty associated with manual intervention and enhancing process stability. By combining uniform heating and rapid sintering with automated control, efficient production is achieved, leading to significant economic benefits through energy and space savings.

Roller Hearth Kilns are Widely Used in the Sintering Field of Lithium Battery Cathode and Anode Materials

The application fields of roller hearth kilns are commonly found in architectural ceramics, electronic powders, and electrical porcelain components. In recent years, with the emergence of industries such as electric vehicles, roller hearth kilns are increasingly being used in the sintering process of lithium battery materials. The main lithium battery cathode and anode materials include the following types.

Sintering of lithium battery ternary (NCM and NCA) cathode materials

Sintering of lithium battery lithium cobalt oxide cathode materials

Sintering of lithium battery lithium manganese oxide cathode materials

Sintering of lithium battery lithium iron phosphate cathode materials

Sintering of lithium battery graphite anode materials

Non-airtight Roller Hearth Kilns and Airtight Roller Hearth Kilns are Suitable for Material Production under Various Atmosphere Conditions

The roller hearth kilns produced by AGICO can support the production of materials under various atmosphere conditions, such as air, oxygen, nitrogen, hydrogen, vacuum, or mixed atmospheres. Roller hearth kilns can be divided into non-airtight roller hearth kilns and air-tight roller hearth kilns. Non-airtight roller hearth kiln, also called air roller hearth kiln, is mainly suitable for sintering materials that require an oxidizing atmosphere. Air-tight roller hearth kilns, also known as atmosphere roller hearth kilns, are suitable for sintering materials that require protection from specific gases (such as N2 or O2).

Air roller hearth kiln: Mainly used for sintering lithium manganese oxide materials, lithium cobalt oxide materials, ternary (NCM) materials, etc.

Atmosphere roller hearth kiln: Mainly used for sintering ternary (NCA) materials, lithium iron phosphate (LFP) materials, graphite anode materials, etc.

The Unique Sealing Structure of the Kiln Body Achieves a Tight Atmosphere inside the Kiln

Intake and exhaust system

Gas supply: Through the uniquely designed air inlet structure, the gas can effectively flow around the material. By adjusting the gas supply, the target concentration of gas around the material is achieved.

Gas discharge: There is a scheduled exhaust port designed on the top of the roller hearth kiln, which can discharge steam and other waste gas generated by the materials. In order to prevent the diffusion of steam in the kiln, the space in the kiln is divided into different areas to avoid mutual influence.

Drive Structure

The use of a spring clutch transmission structure ensures smooth operation of the brake bowl, protects the rods, and simplifies maintenance. Customers can also choose to install a mechanical contact-type rod breakage detection device, making production easier and simpler.

Kiln Lining

All kiln linings are made of ceramic, achieving a clean kiln atmosphere and preventing material contamination.