Case Study

CASE STUDY: OPTIMIZATION OF CLINKER CONTENT IN LIMESTONE-BASED CEMENTS – BALL MILL PROCESS

26 July 22

OBJECTIVE

This case study is based on a real field trial to produce cement with lower carbon footprint optimazing clinker factor and SCM content.

The 2 main objectives of the field trial were:

From product side: to substitute Type 1 cement (CEM I) by Type 1L cement (CEM II/A-L) maintaining strength profile equal or better than Type 1 at all ages
From Production side: to maintain production with a mill output around ~150 mTph

DESCRIPTION

During this field trial, we have compared CHRYSO^®ICARE technology to a conventional product in terms of mill output and we have adjusted limestone addition and fineness/blaine targets.
The Type 1 cement (reference) and the Type 1L cement were sampled for lab testing.

Details and targets :

Cement type: ASTM C595 Type 1L (CEM II/A-L)
Process type: Roller press + Ball Mill
Mill output: 150 mTph
CHRYSO tested product: CHRYSO^®ICARE RP2199-5

MANAGEMENT & OBSERVATIONS

During this first field trial, CHRYSO^®ICARE technology has shown its benefits:

Lower dosage
Limestone content: +4pt
Mill output: +5pt
Carbon footprint*: -32kg eqCO₂ /T of cement
Mechanical strengths:
- 7d : +4MPa
- 28d : +7MPa

* Assumptions:
Limestone: 10kg eqCO2 /T
Clinker: 800kg eqCO2 /T

TECHNICAL
TARGETS
SUCCESSFULLY
ACHIEVED

As late strengths are high, the next step is to perform a long-term trial to increase limestone content. There are different levers to reach this target, for example: