Showing papers on "Sodium sulfide published in 1976"
TL;DR: Neither oxygen, thiosulfate, nor the combination potentiated the protective effects of nitrite against sulfide poisoning, which is clearly superior to that of oxygen, which was the more widely recommended antidote.
Abstract: Oxygen (100% at 1 atmosphere) did not protect mice against death from acute sulfide poisoning as compared with animals maintained under air at 1 atmosphere. Sodium thiosulfate had a small, but statistically significant (P <.05) protective effect against death due to sodium sulfide, whether the mice were maintained under air or oxygen. Pretreatment with sodium nitrite, however, increased the acute intraperitoneal lethal dose for 50% survival of the group (LD50) of sodium sulfide 2.5 times. Neither oxygen, thiosulfate, nor the combination potentiated the protective effects of nitrite against sulfide poisoning. Antidotal effects of nitrite in acute sulfide poisoning were demonstrated in rats. The therapeutic efficacy of nitrite in acute sulfide poisoning is clearly superior to that of oxygen, which is the more widely recommended antidote.
62 citations
Patent•
26 Apr 1976
TL;DR: In this paper, a cyclic process is provided for utilizing sodium values in sulfate cellulose pulping, in which sodium losses normally are less than sodium additions to the process, thus tending to build up a sodium surplus.
Abstract: A cyclic process is provided for utilizing sodium values in sulfate cellulose pulping, in which sodium losses normally are less than sodium additions to the process, thus tending to build up a sodium surplus, and which includes the steps of pulping cellulosic material with a pulping liquor comprising sodium hydroxide and sodium sulfide, separating spent pulping black liquor, evaporating and combusting the black liquor to recover sodium values as sodium sulfide and sodium carbonate, dissolving the sulfide and sodium carbonate in water to form green liquor, causticizing the green liquor with calcium hydroxide to form white liquor, and recycling white liquor to form pulping liquor, the improvement comprising maintaining sodium balance at least in part by removing sodium values as white liquor, oxidizing the white liquor with air at an elevated temperature, and utilizing the oxidized white liquor as a source of alkali in another cellulose pulp treatment process.
31 citations
Patent•
19 Apr 1976
TL;DR: In this article, the authors removed selenium from copper electrolytes by adding a substance selected from the group consisting of metals above copper in the electromotive series, excluding alkali metals, such as nickel powder, cobalt powder and iron powder.
Abstract: Selenium is removed from copper electrolytes by adding a substance selected from the group consisting of metals above copper in the electromotive series, excluding alkali metals, such as nickel powder, cobalt powder and iron powder. Sodium sulfide can also be used along with a subsequent addition of ferric sulfate. The amount of the reactive substance added should be sufficient to reduce the selenium content to below 2 ppm.
28 citations
Patent•
01 Mar 1976
TL;DR: In this article, a process for treating mixed metal sulfides containing trivalent antimony sulfide was described, where the sulfide concentrates were leached with an excess of sodium sulfide in order to isolate copper sulfide and other insolubles in solid form while solubilizing the remaining metal sulfide, separating the insoluble sulfides from the solution, oxidizing the sodium thioantimonite with elemental sulfur to produce sodium thionimonate in solution, crystallizing a portion of the salt, and recirculating the remainder of the solution to
Abstract: A process is disclosed for treating mixed metal sulfides containing trivalent antimony sulfide wherein the sulfide concentrates are leached with an excess of sodium sulfide in order to isolate copper sulfide and other insolubles in solid form while solubilizing the remaining metal sulfides and producing sodium thioantimonite, separating the insoluble sulfides from the solution; oxidizing the sodium thioantimonite with elemental sulfur to produce sodium thioantimonate in solution; crystallizing a portion of the sodium thioantimonate along with other available metal sulfides from solution; and recirculating the remainder of the solution to the sodium sulfide leach stage. The crystallized metal sulfides may be further treated, isolated, and recovered as desired.
19 citations
Patent•
26 Jul 1976
TL;DR: In this article, a process for reducing the requirement of fresh chemicals without increasing emissions in the pulping of cellulosic material with alkaline sodium-and sulfur-containing-sulfate pulping liquor is described.
Abstract: A process is provided for reducing the requirement of fresh chemicals without increasing emissions in the pulping of cellulosic material with alkaline sodium- and sulfur-containing-sulfate pulping liquor, which comprises evaporating and burning spent sulfate pulping liquor to obtain a smelt; dissolving the resulting smelt in water to form a sodium-sulfide-sodium carbonate-containing solution green liquor; regenerating pulping white liquor containing sodium sulfide and sodium hydroxide from said green liquor; and recirculating said regenerated white liquor to the pulping stage; oxidizing at least one of the resulting green and white liquors to form sodium thiosulfate therein; reacting the oxidized liquor with residual acid liquor, from the manufacture of chlorine dioxide by reduction of an alkali metal chlorate solution, to convert thiosulfate to sulfur dioxide and sulfur; removing and recovering formed sulfur dioxide; and returning the residual liquor, freed from sulfur dioxide, to the pulping.
19 citations
TL;DR: Aroylphenylacetylenes reacted with ammonium dithiocarbamate and ammonium hydrogen sulfide in 60% dioxane-waler mixture at 15° to give mainly a mixture of the corresponding β-hydroxy-α-thiobenzoylstyrene derivatives (III) and (E,Z)-β,β'-di(α-aroylstryl) sulfides (IV), whereas with sodium xanthate and sodium sulfide they gave only (III).
16 citations
Patent•
12 May 1976
TL;DR: In this article, the authors present a method to convert a major portion or substantially all of the antimony to a water-soluble sodium compound of antimony and sulfur and to convert at least a portion of the arsenic into the water-insoluble calcium compound of arsenic and oxygen.
Abstract: OF THE DISCLOSURE Tetrahedrite ore concentrate, sodium sulfide added as such or formed in situ, calcium values preferably supplied as lime, and a reducing agent, e.g., coke, are smelted for a period sufficient to convert a major portion or substantially all of the antimony to a water-soluble sodium compound of antimony and sulfur and a major portion or substantially all of the arsenic also con-tained in the concentrate to a water-insoluble calcium compound of arsenic and oxygen. The sodium sulfide is incorporated into the charge for the smelting in an amount sufficient to convert at least a major portion of the antimony into the water-soluble sodium compound of antimony and sulfur; and the lime is incorporat-ed into the smelting charge in amount sufficient to convert at least a major portion of the arsenic into the water-insoluble calcium compound of arsenic and oxygen. A soda matte obtained from the smelting and containing the soluble sodium compound of antimony and sulfur and the insoluble calcium compound of arsenic and oxygen as well as a water-insoluble sulfur compound of copper is leached with an aqueous liquid, ordinarily water, to dissolve substantially only the soluble sodium compound of antimony and sulfur. The aqueous leach solution containing the soluble sodium compound of antimony and sulfur is separated from an insoluble leach residue containing the insoluble calcium compound of arsenic and oxygen and the insoluble sulfur compound of copper.
11 citations
Patent•
10 May 1976
TL;DR: In this paper, a method for separating metallic lead and tin contained in solder drosses was proposed, in which the lead was lifted off the pool by means of a hook positioned in the matte layer while molten and retained in the surface of the pool while the matte was permitted to solidify on the molten lead surface.
Abstract: A B S T R A C T Copper sulfide in the presence or absence of metallic copper contained in a dross obtained from the copper drossing of lead bullion is separated from metal-lic lead entrained or occluded in the dross by introducing the dross into a vessel other than a reverberatory furnace, usually a kettle, also introducing an alkali metal sulfide, preferably sodium sulfide, into the kettle, and heating the dross and alkali metal sulfide together in the kettle at an elevated temperature not in excess of 1200°F. and for a time sufficient to melt together the dross and alkali metal sulfide. The thus-obtained molten dross releases the entrained molten lead which falls to the bottom of the kettle. The molten dross and molten alkali metal sulfide form a low melting copper sulfide-alkali metal sulfide matte on the surface of the resulting pool of the released molten lead, and the matte is separated from the molten lead pool, for instance by being lifted off the pool by means of a hook positioned in the matte layer while molten and retained in the matte layer while the matte layer is permitted to solidify on the molten lead pool surface. Copper sulfide in the presence of metallic copper can also be separated from metallic lead and tin contained in solder drosses, e.g. high tin-bearing solder drosses, or in other drosses in accordance with this invention.
10 citations
6 citations
TL;DR: In this paper, the authors examined the catalysts for sodium sulfide oxidation in aqueous solutions for the systems of hydroquinone, hydroxymethylpolysilicon (HPS), HFRG, and HRS-ammonium peroxydisulfate.
3 citations
01 Jul 1976
TL;DR: In this paper, an analytical technique for the recovery of mercury as HgS from chloride waste is described, which is based on a standard analytical technique, such as this paper.
Abstract: An inexpensive, fast standard analytical technique is reported for the recovery of mercury as HgS from chloride waste. Sodium sulfide and NaOH are employed in the 100 percent effective method. (RFC)
TL;DR: The previously unknown 2-thiabicyclo[2.3.0]hept-3-ene and exo-and endo-6-methyl-2.2.
Abstract: The previously unknown2-thiabicyclo[2.3.0]hept-3-ene and exo- and endo-6-methyl-2-thiabicyclo[3.2.0]hept-3-enes were synthesized in one step from acetylene and sodium sulfide in aqueous dimethyl disulfoxide.