The possibility of determining alunite by the derivatographic method according to the area of desulphurization endoeffect  on the DTA curve and corresponding to this effect the weight loss on the TG curve has been investigated. It has been proposed to carry out the  determination by the calibration curve constructed for standard samples and their area of endoeffect  and by the  weight loss depending on the content of alunite in the samples, since the  dissociation of  sulfur bound from 450⁰C accompanies the whole process. The analysis of samples should be carried out at an intensity of temperature increase of 10⁰C/min, since at an intensity of 30⁰C/min. the peak area increases significantly, and the indicators are not stable. It has been shown that the analyses in an inert medium lead to a twofold loss of sulphur bound, in contrast to the air medium, before desulphurization till the formation of the endoeffect.

doi.org/10.32737/0005-2531-2024-2-60-67