LC3 stands for Limestone Calcined Clay cement. It is a ternary blend of clinker, calcined clay, crushed limestone and gypsum. A nominal blend uses 50% clinker, 15% non-cement grade limestone (high silica or high MgO content), 30% calcined clay (non-ceramic grade) and 5% gypsum.

Calcined clay is calcined between 700-800°C and ground with clinker, gypsum and raw limestone. The LC3 technology promises a sustainable growth of economics around the world by reducing up to 40% CO2 emissions compared to Ordinary Portland Cement (OPC) at lower investment and production costs.

China clay calcination generally uses a rotary calciner and can be easily integrated into the existing production system of a cement plant. Redundant kilns can also be revived to produce LC3.

In certain cases depending on the raw material quality and the desired cement properties, the clinker factor can be further reduced to 0.4 with a proportionate increase in calcined clay and limestone.

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