Effect of Different Acids on the Scale in Pipelines of Linz-Donawitz (LD) Plant (Steel Making Process)

Abstract

In this report we present the effect of different acids on the scales taken from LD plant. The main aspect of the problem is to find a suitable concentration and type of acid to reduce/remove the deposition of scale in the pipeline. The analysis is carried out using a combination of suggestions dictated by experimental evidence and suitable mathematical techniques. Result reveals that 5% solution of Hydrochloric Acid is most effective to dissolve the scale in a specified time at room temperature. The order of effectiveness to dissolve the scale deposits is HCL > HNO₃ > H₃NSO₃> H₂C₂O₄ > H₂SO₄. But when it comes to the corrosion in the pipe the order of corrosion caused by acids is HCL > H₃NSO₃ > HNO₃. So, when we consider both the results HNO₃ is the most suitable acid with respect to both scale deposition and corrosion of the pipelines. Predictions of the data are compared with experiments finding a remarkable agreement with the available data.