Iscor slag de-watering plant

Iscor Vanderbijlpark has contracted Bateman Post-Taphole Services and Paul Wurth to design, supply and erect a Paul Wurth INBA slag de-watering plant at Blast Furnace D. Paul Wurth is the world leader in the design of blast furnace slag de-watering plants.

At Vanderbijlpark, molten slag granulated at a rate of 5 to 8 tonne/min will be pumped in slurry form to the INBA plant, where it will be de-watered and moved to stockpile by conveyor.

The installation of an INBA de-watering system on Blast Furnace D is part of upgrading of the granulation plant and will enable Iscor to improve its protection of the environment. The INBA system has a completely closed water circuit and all emergency overflows are collected in a sump and recirculated. Water consumption will be reduced.

The INBA system to be supplied to Iscor has several attractive features. Optimal filtering conditions are established in the drum by adjusting the rotational velocity to ensure that a bed of granules remains in the drum to serve as a sand filter. Water leaving the drum thus has a low suspended solids content which is not likely to plug downstream equipment. These conditions also limit the relative movement between the granulated slag and drum lining, minimising wear and ensuring long life.

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