Quarry Southern Africa November 2017 - Page 19

WINNING Material is transported across from the quarry to the stockpiles. AfriSam launched its energy efficiency drive in 2000 when it embarked on Project Green Cement, which resulted in the reduction of the clinker content of cement and a subsequent lowering of the total energy required for manufacturing. “By modernising our plants and equipment, and implementing a variety of efficiency and capacity upgrades, we have managed to reduce our specific electrical consumption per tonne of cementitious material by 19% since 2000, which reduces the overall cost per tonne of our cement.” Meyer explains that after electricity, thermal energy is AfriSam’s second-highest cost, with coal for use at the Ulco plant being trucked in from the Witbank area. “Coal is both expensive and energy intensive, but to convert limestone to cement you need a lot of energy. Through our various upgrades, we have managed to reduce our specific thermal energy consumption per tonne of cementitious material by 30% since 2000.” In 2010, in an industry first, AfriSam launched its Eco Building Cement, a move which resulted in the lowering of its carbon footprint to half that defined by the World Resource Institute and the World Business Council for Sustainable Development. It was also the first company globally to introduce a carbon footprint measurement system on each and every cement product relative to the world average. “Our manufacturing process and products are aligned to our environmental philosophy, and our advanced Limestone, iron ore, shale, and coal are stockpiled for use in the cement manufacturing process. composite cements enables us to reduce our CO 2 emissions while also reducing the energy requirements for manufacturing those types of products,” Meyer adds. In recognition of its efforts to produce more environmentally friendly cement, AfriSam received the Nedbank Green Mining Award in 2010, and the Mail & Guardian Greening the Future Award in 2011 for its emissions reduction and energy management programmes. The following year, AfriSam became the first cement company to pledge support for Eskom’s R49-million campaign, to demonstrate its commitment to the global agenda of energy efficiency. In 2013, the company’s Ulco plant received a National QUARRY SA | NOVEMBER 2017 _ 17