Page 15 - Hub-4 Magazine Issue 65

News
Thomas McKiver, Molson Green Head of Sales, takes up the story, “As the material is fed into the GT 130A, heavier items will drop down straight through to a bottom stone auger; past that there is a mesh which sits below the top auger. Basically, this means it stops all the light material being agitated through the water and pushed down amongst all the stone. This mesh also allows free water flow, which also cleans the stone as it flows through.
“The bottom auger is located in a long tube structure, which can be operated in either direction at variable speeds at a variable torque rate. In comparison the top auger is significantly bigger in terms of the width of the screw and has fewer spirals to efficiently lift up the light materials. There is a small gap in between the mesh and the top auger, which is designed to allow a little slippage, so you don’t have an issue with for instance a large stick, consequently alleviating the possibility of any jamming. Machine set-up is dependent on feedstock, which obviously dictates on how long you want it in the water to avoid over scrubbing.”
Looking at the operation it is obvious that water usage plays a very-large part of the process and the Doppstadt GT 130A De- Stoner is a leading exponent in its field proving that it is extremely efficient in this respect.
Being very efficient on water usage means significantly less water, subsequently eliminating any issues processing dirty
water. With low consumption it is therefore from an environmental point of view a clear winner.
Thomas, added, “The wetter the material, the heavier compost (wood) becomes denser, increasing the probability of sinking, therefore the element of organic in the stone pile is significantly increased more than you ever achieve in the light pile; but the light pile in this application is the saleable product.”
Doppstadt GT 130A De-Stoner:
The Doppstadt De-Stoner is easy to transport and offers low operating cost per tonne of finished product. Featuring an 8 cu/m capacity it uses approximately 0.75 -1 cubic metre/hr of water which is primarily due to absorption in the material.
Essentially fed by a screening machine the De-Stoner’s task is to separate material mixtures from floating and non-floating materials (wood, stones, glass) which it achieves by a separation process with water (floating/sinking technique); separated material is then stockpiled through side (heavies: gravel/stones) and end (lights: wood) on-board conveyors. Separated material also does not require long drying periods therefore allowing a quicker turnaround.
Offering a 15-20tph throughput it can be supplied with one of three drive types, diesel, hydraulic or electric.
This launch of the Doppstadt GT 130A De-Stoner certainly compliments the Molson line-up of equipment, again reinforcing their stance of being a sole source of supply which allows clients to maximise on their buying power and simplify their supply chain. With 75 engineers on the road and 13 service locations Molson offer a high level of service back-up that is virtually incomparable in the UK.
www.hub-4.com Nov/Dec 20 - Issue 65
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