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Contractors World 2011 Volume 2 Issue 1
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QUARRYING & PROCESSING

 

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The loss of quality fines during the sand processing phase of production has been eliminated following the introduction of the CDE Evowash plant to replace a bucket wheel de-waterer previously employed at the Sterkspuit site.South Africa
Natal Portland Cement invest in washing plant

Natal Portland Cement have announced major productivity and efficiency improvements at their Sterkspuit quarry in KwaZulu-Natal, South Africa following the introduction of a new washing plant from CDE Global.

The loss of quality fines during the sand processing phase of production has been eliminated following the introduction of the CDE Evowash plant to replace a bucket wheel de-waterer previously employed at the Sterkspuit site.

NPC also report an industry first with the introduction of an Aquacycle high rate thickener allowing for the recycling of 90% of the water used in the washing of their crushed material. While thickener systems are in use throughout the mining sector in South Africa it is believed that the CDE Aquacycle now operating in what is the first of its kind in a crushed rock or sand and gravel application.

NPC are a subsidiary of global construction materials producer, Cimpor of Portugal and operate eleven facilities in South Africa with total production of 1.7 million tons. These include seven ready mix concrete plants, three aggregate production plants of which Sterkspuit is one, two grinding plants and one cement plant.

Washing process at quarry

Sterkspuit quarry is located in the Cliffdale area some 30 km from Durban on the eastern coast of South Africa. The CDE washing plant is processing Tillite from the existing blasting and crushing operations and the washed material is being sold by NPC for use in the production of various asphalt mixes and as a replacement for river sand in their own concrete plants.

From the crushing plant the minus 9.5 mm material is first sent to a CDE Prograde P2-75 double deck rinsing screen fitted with modular Isenmann polyurethane panels on both decks     From the crushing plant the minus 9.5 mm material is first sent to a CDE Prograde P2-75 double deck rinsing screen fitted with modular Isenmann polyurethane panels on both decks. The Prograde produces a 6.7-9.5 mm and a 5-6.7 mm aggregate with the minus 5 mm material being delivered to the sand washing phase.

The Prograde is specifically designed for washing which is a major advantage when compared to many other screens on offer according to CDE. “In the majority of cases rinsing screens are simply dry screens with the crude addition of a few spray bars” explains CDE Sales Manager in South Africa, Des Crawford. “The spray bars are only a small part of the overall design which we believe makes the Prograde screen the most effective aggregate washing screen on the market.”

The design and construction of the spray bar assembly which is a fully independent structure is one of the key features of the ProGrade range.

“The spray bar assembly is not rigidly connected to the screen box as is the case on many other rinsing screens” explains Des. “This eliminates vibration and the associated risk of plant failure.”

There is also a major focus on reducing the loss of both material and water during screening through the use of splash prevention over decks and specialist spray bar seals. “These features are key to a safer, cleaner and more productive site” says Des.     . . . CONT > > >

 

 

BROCHURES


CDE M2500 mobile washing plant
CDE M2500 mobile washing plant


CDE Aqua Cycle A200
CDE Aqua Cycle A200

 

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