Variation of acid-extractable fluoride content in a lot of steelmaking slag

Abstract

In order to manage safe utilization of steelmaking slag, samples of slag are examined to assess the levels of acid-extractable fluoride. From a conveyor of the slag products, 50 increments were obtained every 6 min for 5 h from one lot of a steel making slag to determine the analytical repeatability error of fluoride analysis and the acid-extractable fluoride content variation in an increment and in the entire lot. The analytical error of repeatability was 1.3%, which is a negligible. The coefficient of variance was 5.5% in an increment and 8.9% in the lot, therefore the variation in the lot is 1.6 times larger than that in an increment.