FOCUS INDUSTRY

Mobile plant replaces stationary plant

Patersons Quarries Ltd. in the Scottish county of Lanarkshire has operated the Dunduff Quarry in Kirkmuirhill since the beginning of the 1980s. The hard rock found in the quarry is dolerite originating from the Devonian period with inclusions of sandstone that has hardened under the influence of pressure and heat. The feldspar is of a reddish colour and is used as a decorative and high-quality product on roads, car parks, driveways and in gardens. In addition, aggregate for concrete blocks as well as coarse-grained material for concrete and frost protection are also mined in Dunduff Quarry.
When the time had come to replace the outdated stationary plant, the choice was soon made for a mobile plant from Kleemann. A mobile solution was preferred, since it would allow more flexibility in terms of location and also involved reasonable investment costs. Based on previously built mobile plant combinations and know-how from stationary plant construction, the engineers at Kleemann devised a coherent concept and made sure that it was implemented with maximum efficiency. Today, the mobile plant combination from Kleemann successfully produces the six specified high-quality end products. The new process design even requires no more than two cone crushers – unlike the old stationary plant which had required three – while producing an end-product of higher quality at the same time.

The feed material, which ranges from 0 to 600 mm in size, is pre-crushed to 0 to 260 mm in size by a MOBICAT MC 120 Z mobile jaw crusher directly at the quarry face. It is particularly important at this stage to effectively screen the fines contained in the feed material as, in the next crushing stage, the material is fed to a MOBICONE MCO 11 mobile cone crusher by means of wheel loaders. The MCO 11 crushes around 220 t/h of material to approximately 0 to 75 mm in size, and then transfers it immediately to the second cone crusher, a MOBICONE MCO 11 S, where the material is reduced to grain sizes ranging from 0 to 31.75 mm. Upstream of the crushing unit, the MCO 11 S is equipped with a triple-deck screen that immediately transfers the 0 to 6 mm grain sizes to the next plant, a MOBISCREEN MS 17 Z double-deck screen. The MOBICONE’s 2 000 x 6 000-mm screen decks ensure that the crushing chamber in the cone crusher is filled steadily and effectively. The MS 17 Z screens two end-products of 20 to 31.5 mm and 14 to 20 mm in size, passing the remaining material smaller than 14 mm to the MOBISCREEN MS 20 D mobile triple-deck screen. This extremely powerful plant separates and stockpiles a total quantity of more than 150 t/h of material into high-quality final aggregate fractions of grain sizes 10 to 14 mm, 6 to 10 mm, 3 to 6 mm and 0 to 3 mm.

Kleemann GmbH, Göppingen (D), Tel.: +49 7161 206-0, www.kleemann.info , www.patersonsquarries.co.uk

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