Rate of coprecipitation of cations with sulfides
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A study of the kinetics of the coprecipitation of Ga3+ with HgS and the purification of this sulfide from gallium indicated that the process of coprecipitation is caused by the transition of HgS from the cubic to the hexagonal modification, differing from Ga2S3.
The presence of gallium in HgS accelerates its conversion from one modification to another.
Recrystallization of HgS is observed in nitric acid and is absent in hydrochloric acid medium as a result of the formation of the complex ion [HgCl3]−.
In the aging of CdS, its purification from coprecipitated gallium in the presence of HCl or H2SO4 is not observed as a result of the absence of polymorphic transformations for this sulfide.
KeywordsPurification Sulfide Hexagonal Recrystallization H2SO4
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