East African cement works earn money from waste.

Tipping the contaminated limestone was the only option for this site since it was built around 30 years ago. The waste stockpiles amassed over this time is some 3 million tonnes. Without the necessary equipment to process the mix of limestone and clay – which was often heavily waterlogged in the rainy season – the quarry was forced stockpile the material.

The feed material is 60% limestone, 40% red clay/soil with moisture content during the rainy season of up to 25%. Lump sizes of up to one cubic metre are in the feed. While the recovery of the limestone was important there is also a need for the red clay/soil elsewhere in the plant.

The successful project was achieved with the supply of a 500 TPH rated HT182 heavy duty Trommel mounted on concrete walls with an under screen collecting feeder running the length of the barrel and 50M centres stockpile conveyor. Based on the feed material, a barrel design was recommended by Stelex and agreed by the customer.

The customer is continuing to work his tip along with further contamination at the quarry face.