About the crystallization of stibnite from the aqueous solutions of hydrogen sulphide and about the composition of these solutions

Abstract

The aqueous solutions of the amorphous Sb2S3 is not the hydrophobic sols. The amorphous Sb2S3 reacts with H2O and/or H2S (in aqueous solutions); result: — hydrophilic thioacids, same as the As2O3 reacts with H2O (As2O3 + 3H2O ⇄ 2H3AsO3); this is a reversible reaction. The arsenous acid decomposes to give crystals of the As2O3 (this is a recrystallization process). The solution of the amorphous Sb2S3 in the H2O with H2S give the crystals of the stibnite, and this process can proceed at room conditions. H2CO3 does not decompose this solutions. H2CO3 + insoluble carbonates — this is a buffering system, which stabilizes the solutions of antimonous thioacids and, consequently, stabilizes the process of crystallization of stibnite. Therefore, the insoluble carbonates — this is a common associates of stibnite.