Optimization of processes for production of cement and lime

Purpose and goal

The aim was to decrease the energy consumption and CO2 emissions by 10% cement and lime production, to understand combustion and energy distribution in shaft kilns, and to control quality through optimization of alternative raw materials and fuels. Studies were done on how MgO affects the clinkering reactions, and how MgO contributes to the clinker structure at different temperatures. The aim is to propose process concepts with alternative fuels, new oxidation techniques and dust formation, as well as to develop a new model that simulates a shaft kiln for lime-burning.

Expected results and effects

Experiments with slag as raw material for clinker gives 10% lower emissions. Calculations show that oxygen in the lime kiln gives 10% lower energy need. Studies have increased the understanding of how clinker is afected by MgO, and on energy distribution in quicklime shaft kilns. Theoretical calculations show that increased MgO reduces clinkering temperatures by 50°C . A model for the shaft kiln was developed. Work is still needed to improve and validate the model. New fuel definitions were developed, as well as new data for solid solutions for clinker phases. This work is not yet ready.

Planned approach and implementation

A collaboration was previously established between TEC-Lab at Department of Applied Physics and Electronics, Umeå University and the cement and lime industry. Two industrial PhD students from each industry have worked within the project. The research group, which has extensive experience in the field, got in cooperation with industrial partners, the task to develop the project idea. The work was performed at Umeå University and at industrial sites. The results were compiled, reported and analysed at regular project meetings.

External links

www.minfo.se/?page_id=1230