Tailored solution meets requirement for supply of concrete aggregate for complex dam project
A JOINT-venture comprising Italy’s Cooperativa Muratori e Cementisti (CMC) di Ravenna, Thai company Ital Thai and Vietnam’s Song Da Corporation is using a 1,500 tonnes/h ICM–Terex MPS plant to produce aggregates for 4 million cubic metres of roller compacted concrete (RCC) and 500,000 cubic metres of conventional concrete for the construction of a 105m high x 700m long dam on the Nam Theun river in the Bolikhamsay Province of Laos.
The processing solution comprises two Simplicity 5220 vibrating grizzly feeders, two Cedarapids JS4552 jaw crushers, two Cedarapids MVP550X cone crushers, two Cedarapids MVP450X cone crushers, three ICM T-MAV 21 vertical-shaft impactors, two Cedarapids TSV6202 horizontal screens and six Cedarapids TSV8203 horizontal screens. In addition, the setup includes 45 conveyors with a total length of 1,400m, and the installation of 5,000kW of power.
The plant is being fed with highly abrasive blasted sandstone to produce 0/5mm, 5/12mm, 12/25mm and 25/50mm, as dictated by the mix design of the RCC, with any excess being recycled. A reclaiming plant transports aggregates from stock to a cooling plant via two downhill conveyors (one for coarse aggregates with a capacity of 1,800 tonnes/h and one for sand with a capacity of 700 tonnes/h). The supply is completed by a set of conveyors with a capacity of 1,000 cubic metres per hour, to pour RCC into the dam.
Owing to the abrasiveness of the sandstone, ICM srl designed the plant to use jaw crushers and cone crushers in the first instance, to reduce the rock to the required size for the RCC – at this stage the shape of the aggregate is not of concern. Once sized, the shape is improved using the vertical-shaft impactors.
Icilio Guicciardi of ICM explained: ‘This is a philosophy that always gives good results in terms of the quality of the aggregates and the reduction of wear costs. Having a solution that satisfies our customer’s strict requirements was of utmost importance to us and we knew that this plant setup would produce the output required.’
Commissioned in 2018, the plant is now being operated by Sinohydro, with works expected to be completed in 2023.
Mr Guicciardi continued: ‘This type of project is significant for ICM because it gives us prominence in the market and, at the same time, allows us to supply an interesting line-up of equipment in one shot. This is the third plant in less than 10 years that ICM have supplied for the production of aggregates for the construction of a major project – having supplied Panama with a plant to produce 3,300 tonnes/h of basalt, and Ethiopia with a plant to produce 2,000 tonnes/h of granite.
‘Through these projects, ICM have shown the added value that we provide to ensure the performance of our Terex MPS equipment, in particular our cones and screens, and in the speed of delivery and assembly of the plant – Panama was delivered in four months and started production in 10 months, whilst Ethiopia and Laos were delivered in three months and started production in six months.’
Terex MPS sales director Paul Lilley added: ‘The plant installation at Laos Dam demonstrates how our equipment can be seamlessly combined to provide a tailored solution that consistently delivers aggregates that meet customer requirements – even in complex, extensive projects such as this. We have no doubt this plant designed by ICM will continue achieving ultimate efficiency and production output through to project completion.’