Page 56 - Hub Magazine Issue 56
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Washing & Screening
Newbold Quarry invest in Siebtechnik Tema Pulsator Jigs
Commissioned in early 2018 a new lignite removal plant has recently come on stream at Newbold Quarry. Forming the nucleus of the plant are four SK16-25 Pulsator Jigs which have been supplied by Siebtechnik Tema of Woodford Halse, Northamptonshire.
in 2006 and from the beginning there was always provision for a separate lignite removal plant to be fitted between the 10mm and 20mm belts.
The overall plant design, build and installation contract was awarded to Wright Engineering who commenced work in December 2017 and commissioned the plant in 2018.
After considerable consultation and some stiff competition and numerous site visits in the UK and Europe, an AI Engineering Manager awarded ST a separate contract to supply 4-SK16 Pulsator Jigs and 2-HRE 12/30/IWS Dewatering Screens for the light material and 2-HRE 15/30/IWS Dewatering Screens for the heavy material.
Siebtechnik Tema (ST) formerly Tema Machinery Ltd dates back to 1922 and has been in the same German family since; the name change was actioned to offer a global synergy where companies operating across many borders would in the future be dealing with one name.
Newbold Quarry is operated by Aggregate Industries (AI) who are part of the Lafarge-Holcim group and has a history going back to the 1960’s when Douglas Concrete had its operation there.
The quarry sits in the heart of Staffordshire, South West of Burton-on-Trent, near Barton under Needwood and like other operations in the area suffers with coal, lignite and other organics in various stages of decomposition in their deposits. The quantity of lignite can also vary considerably as can the sand to gravel ratio independent of each other. This creates a vast array of possible feed conditions, therefore any machine supplied needs to be flexible enough and able to perform acceptably to cope with the wide range of feed scenarios.
Currently the site has reserves of 8 million tonnes. The site sells to both internal and external customers and supplies a 0- 4 concrete sand, 20mm, 10mm, 6mm and a 4-20mm aggregate. Currently the site process in the region of one million tonnes per annum.
The original 530tph sand and gravel plant was commissioned
The process:
The remit was to remove up to 99.9% of lignite from the 530tph in-feed of the 20mm and the 10mm product streams which each discharge onto two identical (for commonality of parts) Siebtechnik-SK16-25 Pulsator Jigs, with the course stream jig incorporating a longer stroke.
The cleaned product then discharges over a rubber lined dynamic weir onto the HRE 15/30/IWS Product Dewatering Screen. The lignite, coal and organics are then lifted through the material bed by pulsating up-flow currents which stratify on the bed of gravel and subsequently discharge over the ‘lights’ flume onto the HRE 12/30/IWS Dewatering Screen. The underflow from both the jigs and dewatering screens then returns to a common tank for re-use.
Periodically, silts and adhering grit are recovered from the tank to maintain acceptable levels of water turbidity.
Simon Parry-Jones, Sales Engineer – ST, commented, “One of
| p56 | May/June 2019 - Issue 56

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