16.10.2009 | Editor: Marcel Dröttboom
The acid content of ferrous sulphate, a replacement for the allergenic Chrome (V1), means that it needs to be handled with extreme caution. After assessing Quinn Cement’s requirements and carrying out a full site survey, Portasilo devised a ferrous sulphate storage and dosing system for the plant. It includes a silo with a working capacity of 84 cubic meter to store 100 tonnes of ferrous sulphate.
The silo roof is fitted with a pressure-relief valve for ATEX-compliant explosion protection, a high-level probe, access hatch and a filter unit with pressure switch and humidity transmitter to monitor essential humidity levels in the silo.
The silo itself is constructed from mild steel, with a stainless steel lower cone. The shell and upper cone of the silo are insulated and clad to prevent large temperature fluctuations, minimising moisture formation within the vessel. Filling is done directly from bulk road tankers via an inlet pipe. A dehumidifier is connected to the inlet pipe to ensure that the humidity within the silo is constantly maintained at the optimum level for this sensitive material.
The silo is built on an independent support structure close to the cement mill. The ferrous sulphate is transported from the silo into the milling process via two stainless steel screw conveyors configured in tandem. These conveyors are used to top up a gravimetric feeder, which discharges the material into the cement mix. Quinn Cement is able to carefully control the rate at which the ferrous sulphate is added, ensuring that the correct proportions are maintained within the cement.
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