Using marble offcuts from Northern Italy, these exceptionally white, pure calcium carbonate fillers and extenders are used in a range of applications, where the purest white colour is of paramount importance. However, the recycled marble must be processed to achieve this quality, and a key factor in guaranteeing a consistent particle size is sieving powdered minerals to remove oversize contamination and ensure accurate sizing. Francis Flower utilizes Russell Finex separation equipment for this part of its process (Fig. 2).
The marble by-product is imported from Italy via Avonmouth Docks, near Bristol/UK. It is then transported to Francis Flower’s Gurney Slade site, Somerset/UK, where the marble is pulverized and processed before being shipped for use in a range of applications. Having already applied a Russell Compact Sieve® to check-screen powders during big-bag filling in another production line, Francis Flower decided a further mineral powder sieving system would be needed to quality-check the marble powders during tanker loading.
Lee Dursley, Plant Manager at Francis Flower said, “Following the successful application of Russell Finex equipment in our bag-filling line, we decided to employ a Russell sieving machine to screen selected silos of powder during tanker loading. It was important to find a solution that would be compact and mobile due to the nature of lifting into position above the tanker. The sieve also needed to meet the high capacity demands of tanker loading.”
Francis Flower required a sieve capable of meeting the desired 30-minute loading time for a 28-tonne tanker. With its considerable screening capacity, the company was confident that the Russell Compact Sieve® was the smart choice for this application. The 1200 mm-diameter Russell Compact Sieve® is applied between the loading silos and delivery tankers to screen the marble powder before it is shipped. However, to allow for easier connection and loading to each tanker, the sieve unit is transported and elevated into position above the tanker using a telescopic handler (Fig. 3).
The Russell Compact Sieve® range is used in various industries to remove oversized contamination from bulk powders and granulates. These vibratory screeners are ideal for high-capacity screening where space is limited, or in instances where a mobile solution is necessary (Fig. 4). The units fit neatly into production and filling lines to check-screen incoming or outgoing materials. An innovative design means these screeners are less than half the height of a traditional sieving machine, and a wide range of sizes and customizations are available to meet specific requirements.