NPC South Africa tillite crushed rock washing plant,. - CDE GlobalCrushed rock washing plant from CDE in South Africa for Natal Portland Cement. . While thickener systems are in use throughout the mining sector in South Africa it is believed that the CDE Aquacycle now in operation in the first of its kind in a crushed rock or sand and gravel application. NPC are a subsidiary of global.cement crushing system in south africa,HAZEMAG -Cement & AggregatesAs a global supplier of machines and systems, HAZEMAG ranks among the world's pioneers in proven raw material crushing and processing solutions. Since its founding in 1946 with the invention of the world's first unmatched impact crusher, the HAZEMAG name has been synonymous with engineering excellence,.