Concrete recycling stacks up

A concrete recycler has found a more efficient alternative to recycling concrete with two Thor stackers from Select Engineering Services.

A concrete recycler has found a more efficient alternative to recycling concrete with two Thor stackers from Select Engineering Services.

Tony Gilbert of Select Engineering Services said The Alex Fraser Group, which took delivery of two ThorStack2 Model T140-8 units, benefited greatly from the new stackers’ scope of capabilities.

“The Group uses conventional methods of building stockpiles using loaders, however, with their unique type of product — recycled and crushed concrete — the residual fines and cement pack down with the operation of the loader which creates serious problems when trying to reclaim,” Gilbert told Australian Mining.

“Also, it’s difficult to control segregation and provide product to specification without mixing using the loaders.”

The new stackers have the facility to slew, telescope and luff — all controlled by an onboard PLC.

The stacker is programmed to generate a series of radial windrow piles combining the slewing and telescopic motions.

As the pile builds, an ultrasonic sensor at the head end detects the proximity of the growing pile and raises the boom for the next series of passes.

Discharge of the material is always close to the pile minimising dust, wind segregation and additional generation of fines due to product impacting on top of product on the pile.

Eliminating the use of loaders for stockpiling and control of segregation were the major issues for Alex Fraser to update their operations with the installation of the Thor Stackers.

“Considering rising fuel, labour and maintenance costs for loaders compared with the low operating and maintenance costs of the stackers (essentially two conveyors and some simple drives) plus the elimination of a dedicated operator, the return on the investment was easily justified,” Gilbert said.

Thor-Global have supplied hundreds of stackers world wide including a variety of installations in Australia for coal, iron ore, zinc, aggregates, road base, sand, recycled concrete and heap leaching.

Tony Gilbert

Technical Sales

Select Engineering Services

tony@selectengineering.com.au

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