Quarry Southern Africa November 2017 - Page 20

WINNING Association for Clean Air award following the installation of a bag filter: a device that reduces air pollution by removing particulates released from commercial or combustion processes. AfriSam also introduced an energy policy aimed at actively further reducing its consumption of non-renewable energy, and the installation of the Cement Mill 6 (CM6) separator at Ulco forms part of this. This will change the mill to a closed-circuit mill, allowing the company to mill cement more efficiently. The project is anticipated to result in a 10% energy efficiency improvement for the mill. The Ulco operation also utilises the co-processing of tyres in kilns as part of the manufacturing process, reducing the use of traditional fossil fuels. Another project currently in the pipeline at the Ulco operation is a waste heat recovery system. High temperature gas, normally vented through the kiln stack, is utilised to generate electricity that will be recirculated for use in the plant. “AfriSam will continue to research and implement measures that lead to less dependence on non-renewable resources. We encourage other businesses to carefully consider the impact that their manufacturing operations have on both the local and global arena and to adjust methodologies to align with future energy conservation expectations,” says Meyer. n 1 2 Facts and figures AfriSam is the largest aggregates and ready-mix (construction materials) supplier in southern Africa. Construction materials • National footprint: 17 aggregates quarries (Gauteng: 7, Mpumalanga: 1, KwaZulu-Natal: 6, Western Cape: 3) • Annual production capacity: >10 million tonnes of aggregate. Ready-mix • National footprint: 40 ready-mix operations (Gauteng: 18, Mpumalanga: 5, North West Province: 3, KwaZulu- Natal: 8, Western Cape: 6) • Annual production capacity: >4 million cubic metres of ready-mix concrete. 1. Various capacity and efficiency upgrades have been carried out at Ulco since 1984, including installation of a raw mill separator and bag filter, and upgrades of the cascade fan and clinker cooler. 2. Cement is stored in silos until packaged or loaded into bulk tankers for transport via rail or road. 3. Cement can be packaged and palletised, or shipped in bulk via rail or road. 18 _ QUARRY SA | NOVEMBER 2017 3