This is not a miracle!
Best STICHWEH practice – Bucket wheels for the US market
Real challenges at CalPortland’s Santosh Aggregates preparation plant
A truly major project in the country of unlimited possibilities. The cement producer CalPortland (CPC) had implemented a completely new hydraulic suction dredging system with a cutter-head (from DSC Dredge LLC) and had, thus, doubled the production rate at its preparation plant, Santosh Aggregates, in Scappoose, Oregon.
Now the big question was – is there a dewatering method that could handle the separation of enormous volumes of solid-water slurry so that the solids could be transported via a conveyor belt system to the processing plant up to two miles away?
Who could make the nearly impossible possible?
The dewatering system had to be implemented in such a way that approx. 15,000 gpm? 18,000 gpm? of slurry volume with 1,500 t/h? of solids content and rock size of up to approx. 12-in could be safely processed.
Furthermore, the system would have to recover the fine sand that had previously been lost during the production process using a dragline excavator.
No miracles – it was all down to experience
Who was able to deliver such a system? Competitors were called upon and their solutions compared. And the best one was chosen, namely, bucket wheels made by the German company STICHWEH. This was because bucket wheels are able to process high flow rates, high volumes of solids as well as gravel and, in doing so, simultaneously recover fine sand down to 200 mesh – all with minimum power consumption and maintenance.
Last but by no means least, a site visit to a gravel plant in Arkansas left a strong impression. A STICHWEH double bucket wheel went into operation there in 2007 and, since then, more than 10 million tons of sand have been dewatered – trouble-free and with no replacement parts requirement.
They wanted a STICHWEH. They got a STICHWEH.
STICHWEH was invited to offer a dewatering concept for the recovery of raw materials.
The STICHWEH recommendation was to have four bucket wheels with a double arrangement in each case to process the underflow of a scalping screen.
The double set of bucket wheels consisted of two bucket wheels from STICHWEH’s “E“ model series positioned in such a way that enabled them to receive the underflow of the scalping screen. For every “E“ bucket wheel another one from the “ES“ model series was connected in parallel to carry out the fine sand recovery.
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