thyssenkrupp to build Cameroon cement plant

(Posted on 31/03/20)

thyssenkrupp is to fit the first cement plant with a system for the production of calcined clay

for the Dutch-based company Cimpor Global Holdings. The technology developed by

thyssenkrupp lowers CO2 emissions in cement production by up to 40 percent. It involves

replacing part of the cement clinker with calcined, i.e. thermally activated, clay. Cimpor

Global Holdings will use the technology, known as “polysius activated clay”, on an

industrial scale at a new plant being built near the Cameroon sea port of Kribi. On

completion in fall 2021, the plant will save more than 120,000 tons of CO2 emissions every

An important building material, cement is produced by an energy-intensive process in

which large quantities of carbon dioxide are emitted. “At thyssenkrupp we are convinced

that CO2-neutral cement production is fundamentally possible and can be achieved in

several steps,” says Pablo Hofelich, CEO of the Cement Technologies business unit. “We

are already very advanced in many areas on the technology side. We offer our customers

products that reduce environmental impact and at the same time reduce costs, making it

possible for example to significantly cut CO2 and nitrogen oxide emissions and reduce the

use of raw materials, water, or fossil fuels such as coal and gas.”

Under the order, thyssenkrupp is carrying out engineering, procurement, construction and

commissioning of the new plant, which will produce 720 tons of activated clay per day. It is

the second calcined clay project of Cimpor Global Holdings.

CO2 is a natural constituent of limestone, the main component of cement. For each ton of

cement clinker produced, around 790 kilograms of process-related CO2 is emitted. Around

two thirds of this results from the limestone used, which releases CO2 in a chemical reaction

in the production process. At the same time the process requires large amounts of energy,

because for the production of cement clinker, limestone has to be heated with other

aggregates to temperatures of more than 1,400 degrees Celsius.

With polysius activated clay, thyssenkrupp has developed a technology that allows around

one third of the cement clinker to be replaced with activated clay. The clay is heated to

around 800 degrees Celsius – significantly less heat than is needed to produce clinker.

Thanks to the significant energy saving in the production of thermally activated clays and

the changed chemical composition, CO2 emissions per ton of cement can be cut by up to 40

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