South Uzbekistan Research Articles

Effect of sulfide and petroleum aromatic concentrates on gold ore processing by flotation

The authors have analyzed applicability of butyl potassium xanthate coupled with sulfuraromatic concentrate, recovered from high sulfur diesel fraction of South Uzbekistan oil in two-stage extraction in the zinc chloride solution in N,N-dimethyl formamide, in flotation of gravity circuit tailings. The best performance has been reached at the ratio of the said concentrates as 2/1, which results in 12.2% reduction of gold loss in tailings, and, for another thing, the quality of the rougher sulfide flotation concentrate grows by 6 g/t.

1996年度ダルベルジンテペ (南ウズベキスタン) の発掘

1996年度ダルベルジンテペ (南ウズベキスタン) の発掘

Essential oil of the leaves ofHyssopus seravschanicus from south Uzbekistan

Essential oil of the leaves ofHyssopus seravschanicus from south Uzbekistan

Composition of nitrogen bases of Dzharkurgan crude oil (South Uzbekistan)

While continuing investigations into the nature of hetero-organic oil compounds of South Uzbekistan, the authors examined the individual composition of some aromatic compounds of this series, contained in concentrates of nitrogen bases of commercial Dzharkurgan petroleum. A study was made of the composition of nitrogen bases of Dzharkurgan crude oil (South Uzbekistan) by high-speed liquid chromatography and microhydrogenolysis under gas-chromatographic conditions. Mass-spectra were obtained for hetero-organic compounds and their picrates. The structure of the following individual compounds was established: 4-methylquinoline, quinoline, isoquinoline, 3-ethylquinoline, 2,4-dimethylthiazole, 2-phenyl-4-methylthiazole and 2-phenyl-4,5-dimethylthiazole. It was shown that alkylpyridines (methyl- and dimethyl-substituted) and 2(8)-methyl(ethyl)quinolines are present in the concentrate of nitrogen bases. 7 references.