Processing of clayey aggregates

Terex Washing Sytems (TWS) hosted their second open day in the medieval region of Chambellay/France. The Open Day was organized and hosted in conjunction with one of TWS’s French distributors, Catecom and their customer, Santrac (Fig. 1). Santrac were celebrating 40 years in business, which provided the perfect opportunity to celebrate the occasion in the form of an Open Day. The event attracted more than 80 guests including TWS dealers, their customers and Santrac’s customers, who had the opportunity to see the Terex® AggwashTM 60-1 wash plant operating at first hand. The Terex® AggwashTM is a mobile washplant that brings together rinsing, screening, scrubbing and sand washing capabilities on a transportable single chassis. Primarily designed for the processing of construction and demolition waste but equally suited to virgin material applications. The AggwashTM is capable of producing 4 grades of aggregate and one or two grades of sand with a capacity in excess of 70 t/h.

The plant was installed on the Santrac site early in 2014 and is processing natural sand and gravel (Fig. 2). Santrac required a solution to process natural sand and gravel that was particularly clay bound, with a high level of silt. The Terex® AggwashTM wash plant was selected for this application based on the attributes of the plant and its ability to process this type of application. The plant offers fast installation, with a pre-wired and pre-plumbed design. The logwasher component of the plant breaks up the clay bound material, liberating the clay and sand from the stone producing 3 aggregates, 4-8 mm, 8-20 mm and 20-40 mm, one oversize, 40 mm+ and one concrete sand. The AggwashTM wash plant also has the ability to remove the organics from the feed material and any floating material that comes from the rear of the trash screen washer and is dewatered on the logwasher. All water used in the process is collected in a centrally located slurry collection tank which is then in turn pumped to the hydrocyclone where the sand is captured and not allowing any loss. Santrac is recycling the water via a standard tailing pond system; settling silts out and pumping clarified water back through the plant again, making the process very efficient.

Fergal McPhillips, TWS Sales Manager, commented “Catecom has grown over the last two years, clearly demonstrating an acute understanding of the washing demands in France. They have greatly increased market share and have expanded their business line for greater future growth within all washing segments such as concrete and building sands and in wash recycling.”

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