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Crushing and Screening Crushing and Screening at Kenyan Dam Project

Autor / Redakteur: R. Murrow / Marcel Dröttboom

Two millions tonnes of material will be required for a road building and drinking water dam project in one of the driest regions of Kenya. The large volume and the remoteness of the location place high requirements on the necessary crushing and screening equipment, especially in terms of throughput and reliability.

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Water is the world’s most precious resource, and in many parts of Africa the ability to provide clean drinking water is literally the difference between life or death for many people. In order to facilitate the provision of water for drinking and agricultural use, the 17th October saw the official opening of the Chemususu Dam project located 80 kilometres North West of the town Nakuru in the Rift Valley. The dam stores almost eleven billion litres of water when in full operation, in order to service one of the driest regions in Kenya. The rains for Rift valley have often proved to be unreliable, and thus the Kenyan government has taken this step to ensure drinking and associated requirements will be met for years to come, even in the driest seasons.

The official opening coincided with the commissioning of a mobile screening and crushing train supplied by Sandvik Mining and Construction Tanzania. This has been supplied in conjunction with the VAS Group, a Nairobi based supplier of specialist construction equipment. The screening and crushing train is initially being utilised to produce road base for the haul roads on site, and will then be required to provide all necessary aggregates for the fill and associated construction requirements.

The screening and crushing train consists of a jaw crusher, a cone crusher and a screener. The productivity, mobility, manufacturing quality and the inherent versatility of the individual units have been proved to be perfectly suited to working in what is initially a confined space. As the site expands, the high output of these machines will be crucial in meeting the two million plus tonnes of material required for completion of the project. The double-deck of type QA240 has been designed for operation where high volume throughput is required, but also there still exists a requirement for precision screening, which is also met by this machine. The patented double screen box enables greater accuracy, productivity and a more efficient screening system. Each box is hydraulically adjustable, incorporates a separate drive motor to enable a reverse throw of materials and separate variable speed motors for each screen box. The system produces a huge screening area, at least equivalent to a traditional 4.8 metres times 1.5 metres screening system, but with two independently adjustable screen boxes for precision screening and high volume production.

The QJ240 is a highly productive tracked jaw crusher, and this compact self-propelled machine brings the features of manufacturer’s tracked jaw crushers, but in a format designed for operation where operating space is limited, yet high performance required. The Sandvik cone crushers units marry the manufacture’s cone crushers, with their proven design and manufacturing capabilities, with a track-mounted mobile machine that sets new standards in crusher throughput, and finished product shape. To this end the QH340 makes excellent use of the powerful QH340 cone unit. Designed specifically for crushing and sizing minerals, this cone unit is able to work as an independent unit, or as part of an integrated aggregate production line in harmony with the other members of the screening and crushing family.

In such a remote region as the Rift Valley, the ability of Vas Group, and SMC Tanzania, to support the aftermarket requirements of the units was crucial in the decision to opt for Sandvik. The high production required from the screening and crushing train means that downtime must be kept to an absolute minimum. SMC and the Vas’s groups ability to provide on-site servicing, and Sandvik branded parts at very short notice, was an important factor in choosing the machinery.

The Kenyan government is committed to reversing years of under investment in its water infrastructure, and Booker Mbugua, Managing Director of VAS Group, stated, that the Chemususu Dam project is the first of many that will require similar equipment.

Sandvik Mining and Construction Ltd.