A joint venture of Italy’s Cooperativa Muratori e Cementisti (CMC) di Ravenna, Thai company Ital Thai and Vietnam’s Song Da Corporation is using a 1,500mtph ICM – Terex MPS plant to produce aggregates for a 4 million m3 RCC (rolled compacted concrete) and 5 hundred thousand m3 CVC (conventional concrete) dam at the Nam Theun River, Bolikhamsay Province, Laos.
The dam, which is 105m high and 700m long at the top, will produce electricity in three groups: two units of 250 MW to be distributed in Thailand, and one group of 150 MW to be distributed for local use in Laos.
The solution consisted of a complete crushing plant to produce 1,500mtph of concrete aggregates. The plant is made up of two Simplicity Vibrating Grizzly Feeder 5220, two Cedarapids Jaw Crushers JS4552, four cone crushers, of which two are Cedarapids MVP550X and the other two are Cedarapids MVP450X, three ICM Vertical Shaft Impactor T-MAV 21, two Cedarapids Horizontal Screens TSV6202, and six Cedarapids Horizontal Screens TSV8203. Additionally, the set up includes an impressive 45 conveyors (total length of 1,400m), and the installation of 5,000kW of power.
The plant is being fed by blasted sandstone rock with a high abrasion index to produce 0/5, 5/12, 12/25 and 25/50 mm, 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 1,800mtph and one for sand with a capacity of 700mtph). The supply is completed by a set of conveyors with a capacity of 1,000cmh to pour RCC into the dam.
Due to the abrasiveness of the sandstone, distributor ICM srl, Italy, designed the plant to use jaw crushers and cone crushers in the first instance to get the rock to the required size for the RCC—at this stage not worrying about the shape of the aggregate. Once sized, the shape is improved using the Vertical Shaft Impactors.
Commissioned in 2018, the plant was supplied by distributor ICM srl, Italy, who also completed all the engineering required (except civil works), equipment, electrical system (power and controls), steel work (hot galvanized), delivery, assistance to assembly and erection up to commissioning (with customer crew). The plant is now being operated by Sinohydro, with works expected to be completed in 2023.