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Save to read list Published by David Bizley , Editor World Cement, Friday, 17 December 2021 10:30
John Hodson, Cardox, describes the company’s silo clean out strategy for Hanson’s cement plant in Purfleet, UK.
For several years, the Hanson Cement Plant at Purfleet persevered with a gradually reduced throughput in its GGBS (ground granulated blast-furnace slag), caused by moisture ingress which had resulted in an ever decreasing ‘rat hole’ that was becoming smaller and smaller, until it became totally blocked with approximately 80% dead stock product. Hanson then called in Cardox International and requested a total silo clean out.
The silo in question is a steel construction measuring 30 m in height and 10 m in diameter, with the bottom 15 m forming a cone section. At the base of the cone, a discharge valve releases material onto the conveyor belt. An inspection of the silo revealed that the cement slag material was bridged approximately 2 m above the discharge valve and over the years, a thick hardened crust had formed, above which the material had been subjected to moisture and weight that had transformed the product into a solid dense mass.
From a manhole at the top of the silo, it was determined that the top of the cement slag material was approximately 5 m from the roof of the silo, so the total depth of product was around 23 m thick and amounted to over 2000 t.
The silo clean out strategy devised by Cardox engineers involved three phases:
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Read the article online at: https://www.worldcement.com/special-reports/17122021/the-light-at-the-end-of-the-silo/
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