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Sandvik offers advice on crushing technology

World Cement,

Low production rates and maintenance downtime were the main issues causing Wheales problems in allowing them to meet their production contract with Lafarge Aggregates at their Toton Sidings distribution yard in Nottingham. The Toton site deals exclusively with rail ballast and had contracted Wheales to process rail ballast into a range of manufactured sand and aggregates.

After a visit to the site, Sandvik was able quickly to suggest a solution. The fitting of a Sandvik 85 HP patented second generation rotor and wear parts was discussed and, within days, the retrofit on the current VSI crusher was made. The actual conversion took no more than a couple of hours of work on-site, without any modifications to the crusher. Results were immediate: production increased while maintenance downtime decreased and very troublesome vibration levels were completely eliminated.

Previously, an eight hour day of production was averaging between 280 - 325 t of 0 - 5/5 – 20 mm and 500 tpd of type 1 sub-base. Wheales Environmental immediately saw an increase with the Sandvik rotor of up to 745 tpd of 0 - 5/5 – 20 mm and 1100 tpd of type 1. Also, with the Sandvik rotor, Wheales was able to operate the crusher for 150 hours before any rotor parts required changing.

Figure 1. Feed material to the VSI crusher.

Specific application details are as follows:

  • Nominal feed size to the mobile VSI crusher (pre-screened): 20 – 63 mm.
  • Required products: 0 – 5 mm manufactured sand, plus 5 – 20 mm aggregate and also type 1 aggregate.
  • Material: granite (very competent Leicestershire granite from the Mountsorrell Quarry).
  • Post screened with Sandvik QA330 double deck screen unit (25 mm top deck and 5 mm bottom deck).

Figure 2. The Sandvik 85 HP rotor, fitted with no modifications to the crusher.

Les Cassell and Ged Laggan, both Wheales Environmental site operatives, were delighted and commented, “the Sandvik rotor has saved us a lot of downtime and work inspecting and constantly changing parts. Also, the ease of maintenance with the Sandvik rotor means it will continue to make everything less problematic in the future. We are also now continuously meeting Lafarge’s production schedules.”

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