Sulfide, hydro

Sulfides, Hydro-sulfides and -selenides and Other Small Ligands 1132... 

G.B. Harris, V.I. Lakshmanan, T.J. Magee, and R. Sridhar, Atmospheric Chloride Leaching of Base Metal Sulfides , Hydro-Sulfides (2004), International Colloquium on Hydrometallurgical Processing of Copper Sulfides, Santiago, Chile, (2004), 384-398. 

SODIUM SULFIDE-HYDRO (2.5), SODIUM CARBONATE, SULFUROUS ACID Unknown 176 X ... 

A double end point, acid—base titration can be used to determine both sodium hydrosulfide and sodium sulfide content. Standardized hydrochloric acid is the titrant thymolphthalein and bromophenol blue are the indicators. Other bases having ionization constants in the ranges of the indicators used interfere with the analysis. Sodium thiosulfate and sodium thiocarbonate interfere quantitatively with the accuracy of the results. Detailed procedures to analyze sodium sulfide, sodium hydro sulfide, and sodium tetrasulfide are available (1). 

Barium hydro sulfide [25417-81-6], Ba(HS)2, is formed by absorption of hydrogen sulfide into barium sulfide solution. On addition of alcohol, barium hydrosulfide tetrahydrate [12230-74-9], Ba(HS)2 4H2O, crystallizes as yellow rhombic crystals that decompose at 50 °C. Sohd barium hydro sulfide is very unstable. Its solubility in water is... 

The dissolved hydrogen sulfide is oxidized to form a mixture of elemental sulfur and hydro-quinone. The solution is injected with air or oxygen to oxidize the hydro-quinone back to quinone. The solution is then filtered or centrifuged to remove the sulfur and the quinone is then reused. 

Hydro-peroxyd, n. hydrogen peroxide, -per-sulfid, n. hydrogen persulfide, hydro-phil, n. hydrophile, hydrophil(ie). -phob, a. hydrophobe, hydrophobie. 

Hydro-thionsaure, /. hydrosulfuric acid, hydrogen sulfide. -verbindung, /. hydro eompound (eompound formed by the addition of hydrogen). 

Identifying sulfur compounds in crude oils and their products is of little use to a refiner because all sulfur compounds can easily be hydro-desulfurized to hydrogen sulfide and the corresponding hydrocarbon. 

The copper sulfide formed on the surface of the sphalerite mineral reacts readily with the xanthate, and forms insoluble copper xanthate, which makes the sphalerite surface hydro-phobic. Such a reaction for activating sphalerite occurs whenever the activating ions are present in the solution. It is thus necessary to deactivate sphalerite (to prevent the occurrence of natural activation) in the case of some ores. With lead-zinc ores, for example, natural activation occurs due to Pb2+ in solution... 

It has been mentioned in an earlier chapter that nickel deposits are basically of two types sulfidic and lateritic (oxide). The scenario of nickel extraction from nickel sulfide concentrates and nickeliferrous pyrrho tite (these two are the two products of physical beneficiation of nickel sulfide ores), and from limonitics and gamieritics (these are the common lateritic ores) has been presented in Figure 5.6. It can be seen that nickel is extracted from its various sources by pyro, pyro-hydro and hydroprocessing. The account given here pertains to the latter two processes applied to the various nickel sources. 

With regard to the sulfidic sources of copper, the main emphasis, as far as hydro-based process applications are concerned, has been on the chalcopyrite concentrates. Of the copper-bearing minerals, chalcopyrite (CuFeSJ is by far the most abundant but its reactivity in... 

A salt derived from a hydracid is named according to the nonmetal present in the parent acid, and the salt will end in - ide . The metallic part of the salt is named first. The prefix hydro is dropped and suffix - ic (of the acid) is changed to - ide . HC1 HBr HCN H2S Sodium chloride (NaCl) Magnesium chloride (MgCl2) Potassium bromide (KBr) Zinc bromide (ZnBr2) Sodium cyanide (NaCN) Potassium sulfide (K2S)... 

Hydrometallurgy has frequently been praised for not having any highly adverse impact on the environment. The problems associated with sulfur dioxide emission to the atmosphere from the roasters and the smelters of sulfidic sources have created much interest in treating these resources by hydrometallurgical methods. Moreover, the extreme amount of effort that has gone into the development of hydro-based processes for the sulfidic sources... 

Although these hydro-based processes, when applied to sulfidic sources, do not cause air pollution due to sulfur dioxide emission, they - and many other hydrometallurgical operations that are generally used for a wide variety of raw materials and resources - can create both land and water pollution problems. 

Many hydrogen compounds are acids. Acids require a different system of nomenclature than other compounds. There are two types of acids binary acids and ternary acids. All acids include the word acid in their name. Binary acids contain only two elements one of which is hydrogen and the other a nonmetal. When naming binary acids, the prefix hydro- appears before the root name of the nonmetal, and there will be an -ic suffix. As an acid, H2S would be hydrosulfuric acid. We used H2S to illustrate the fact that there can be two possible names, hydrogen sulfide or hydrosulfuric acid. If your instructor does not specify which name to use, either is correct. Technically, the name hydrosulfuric acid only applies to aqueous solutions of H2S, H2S(aq). 

Selenoxides are protonated by sulfonic acids and the corresponding hydro-xyselenonium sulfonate salts are soluble oxidants for the oxidation of sulfides to sulfoxides.Chlorooxaselenuranes have also been used for the oxidation of sulfides to sulfoxides. ... 

Metalliferous sediments are a common component of modern ocean-floor sedimentary sequences, recording halos of metal dispersion from seafloor hydro-thermal vent systems (Gurvich, 2006). Sulfidic black shales are also commonly present as intercalations in ancient subaqueous volcanic sequences, where each likely represents a significant hiatus in volcanic activity and deposition. These shale horizons form geophysical anomalies (conductors) that are routinely drilled during exploration for volcanogenic massive sulfide (VMS) base metal deposits. 

Simmons, S. F., Brown, P. R. L. 2000. Hydro-thermal minerals and precious metals in the Broad-lands-Ohaaki geothermal system Implications for understanding low-sulfidation epithermal environments. Economic Geology and the Bulletin of the Society of Economic Geologists, 95, 971 -999. 

It also reacts with epoxides forming 2-hydroxyalkyl thiols, eg, 2-mercaptoethanol [60-24-2] and bis (2-hydro xyalkyl) sulfides such as bis (2-hydro xyethyl) sulfide [111-48-8]-, both products are made commercially ... 

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