Abstract
In view of the recent scarcity of pure tartaric acid the authors made a study on a rapid method of determining lime in the basic slag without using tartaric acid as with the case of usual method. The principle of our method consists in treating the hydrochloric acid solution of the sample with excessive amount of NH4OH and ammonium oxalate solution in the presence of ammonium chloride, and, after the filtration of Fe(OH)3, Al(OH)3 and calcium oxalate, determining the amount of lime by titrating the excessive amount of ammonium oxalate which is present in the filtrate with 0.1 N permanganate solution. After the application of our method to the rapid analysis of lime in blast furnace slags and open-hearth furnace slags, it was proved that the maximum deviation of the results. is ± 1%, the time required is about 10 minutes, and the quantity of ammonium oxalate used is about half comparing with the case of applying the usual method.
