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 kiln, MULTIPOL multiple hearth furnace or POLCAL gas suspension calciner –the state-of-the-art equipment we supply will offer you key operational benefits.
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.
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.