Calcination furncaces

Calcination furnaces

Whatever calcination equipment you choose from thyssenkrupp, e.g. rotary kiln, multiple hearth furnace or gas suspension preheater, you will profit from key operational benefits.

In the mining industry calcining or calcination is the term commonly used to describe a thermal treatment process applied to ores such as kaolin, lithium and magnesite to achieve thermal decomposition, e.g. crystal water removal, CO2 removal, or phase transformation of minerals.

A calciner furnace is a directly or indirectly heated furnace where processing is carried out in a controlled atmosphere at the required temperatures of 550–1,150 °C.
The product of calcination is generally known as calcine, regardless of which thermal treatment process is used.

Industrial calcination furnaces vary in design, e.g. rotary kilns, shaft furnaces, multiple heart furnaces or gas suspension calciners. With decades of experience in manufacturing calcination furnaces, thyssenkrupp can supply you with a reliable, high-performance solution to meet your needs.

How you benefit from calcination furnace

Whatever calcination furnace you choose from thyssenkrupp – a rotary kilnMULTIPOL multiple hearth furnace or POLCAL gas suspension calciner –the state-of-the-art equipment we supply will offer you key operational benefits.

Low resource consumption, high operational reliability

Low investment, operating and maintenance costs

Excellent energy efficiency and productivity

High flexibility and availability, particularly in high-throughput processes

Rotary kilns

Rotary kilns from thyssenkrupp are used for burning, calcining, reducing, roasting, or sintering a very broad range of materials. In the mineral industry they are deployed to process kaolin, lithium, magnesite, nickel, iron, and much more. Read more about our rotary kilns.

Multiple hearth furnaces

MULTIPOL multiple hearth furnaces from thyssenkrupp are used for processing very fine-grained materials at ultra-precise temperature settings. Read mor about Multiple hearth furnaces.

Gas suspension calciners

POLCAL gas suspension calciners from thyssenkrupp consist of up to six cyclone stages arranged one above the other and a calciner riser duct for drying, preheating and (pre)-calcination of the material. For very moist materials a flash dryer can be installed upstream, which is good for your overall energy balance. Read mor about Gas suspension calciners.

Examples of calcination processes

Calcination of limestone or magnesite to remove CO2

MgCO3 + heat à → MgO + CO2

When calcinated at temperatures of around 800°C, the material is known as calcined caustic magnesia [CCM]. Sintering temperatures of approx. 1,800°C are deployed to produce sintered magnesite or dead burned magnesite [DBM] as it is often known.

Calcination of ferronickel or gypsum to remove crystal water as water vapor

Calcination of kaolin or lithium (spodumene) to effect phase transformation/conversion

Decomposition of volatile matter contained in ores – loss on ignition (LOI)

Innovative and reliable customized solutions

Our plant designs are based on the customer's requirements. With the help of material analyses, laboratory test procedures, computer simulations, and calculations, we individually and accurately configure the optimal furnace plant for each user.

Leading R&D

Our R&D Center is one of the world's leading technology development sites for the mineral, mining, refractory and chemical industries. It is also an indispensable factor for design safety. With laboratories for chemical, physical, geological and mineralogical investigations and departments for technical calculations, measurements, process and design development our R&D Center makes innovative developments possible – for the customer’s benefit. At pilot plants for small-format production lines for the different kiln types we carry out internal tests, test components, and investigate environmental impacts.

Today our furnaces represent the best available technology for thermal applications in the refractory industry. Innovative cutting-edge technologies trusted by customers all over the world.

Boost your efficiency with our Maintenance Assistance System (MAS)

The Maintenance Assistance System is a software framework that can be configured to fit various types of machines for several applications like mining technologies, materials handling and mineral processing.

Find out more about our Maintenance Assistance System (MAS)
POLFLAME rotary kiln burner
POLFLAME rotary kiln burner

The POLFLAME is designed for burning a very broad range of fuels – standard fuels or secondary fuels, as a single fuel input or as a complex fuel mixture.

Flash cooler
Flash cooler

The proven design of the flash cooler is efficient, space-saving and low on maintenance. It can be used for various cooling options and is specially designed for use with fine materials. Its application areas are phosphate, lime, gypsum, sand and other ores with grain sizes of up to 2 mm.

Rotary cooler
Rotary cooler

For many processes this robust rotary cooler is the optimum solution. Benefits such as high throughput rates, easy handling, great flexibility for fluctuations in material properties and quantities, high availability, and a low maintenance requirement speak for themselves.

POLPELL drum pelletizer
POLPELL drum pelletizer

The POLPELL drum pelletizer from thyssenkrupp Industrial Solutions is a highly specialized aggregate for the agglomeration of fine-grain materials that are to be processed to high-grade products in additional equipment (e.g. the POLSHAFT dryer or POLSINT high-temperature shaft kiln).