38 results about "Hydrogen arsenide" patented technology

The invention relates to a passivating treatment process of a super-high-purity arsenic hydride, hydrogen phosphide and mixture gas steel cylinder. The process comprises the following steps that a first steel cylinder to be subjected to passivating treatment is heated and baked at a high temperature of 100 to 200 DEG C; the first steel cylinder is subjected to vacuum pumping treatment through an exhaust fan; the first steel cylinder is continuously subjected to heating and baking treatment at a high temperature of 100 to 200 DEG C; when the first steel cylinder is pumped into a vacuum state, scavenging and replacement are performed; the first steel cylinder is subjected to vacuum pumping treatment through the exhaust fan, and the first steel cylinder is continuously subjected to heating and baking treatment at a high temperature of 100 to 200 DEG C; when the first steel cylinder is pumped into a vacuum state, the inner wall is passivated; the first steel cylinder is subjected to vacuum pumping treatment through a gas pumping-back device; extracted arsenic hydride and hydrogen phosphide gas is recovered to a gas recovery steel cylinder.

The invention relates to a technology for removing organic sulfur at a low or normal temperature to prepare high-purity carbonic oxide gas. The method consists of gasifying the coke with carbon monoxide or carbon dioxide to prepare the raw gases including 10 % -99 % CO, 0.1 %-90 % CO2, 0.001 %-2 % O2, 50-9000ppm COS, 10-10000ppm H2S, through gas storage holder, after pressurization and pyrogenation, entering purification tower filled with puripreservatives of A and B to remove hazardous materials including nitrogen oxide, hydrogen arsenide, hydrogen phosphide, hydrogen chloride, hydrogen nitrile, oxides of sulfur and sulfureted hydrogen, entering tower for removing organic sulfur filled with sulfur carbonyl hydrolyst, hydrolyzing 85%-95% of sulfur carbonyl for conversion into sulfureted hydrogen, at 20-150 DEG C, with a pressure of 0.1-10 MP, in which the refined raw gases can be used by productions of fine chemical industry including downstream acetate, dimethyl formamide,dimethyl ether, toluene diisocyanate or methyl diphenylene diisocyanate. The technology converts 85 %-95 % of sulfur carbonyl into sulfureted hydrogen, can adopt routine wet desulfurization to replace polyethylene glycol dimethyl ether desulfuration,can carry out cycle utilization of carbon dioxide and sulfur carbonyl of decarburized desorption gases of polyethylene glycol dimethyl ether, and can carry out zero discharge of poison material of sulfur carbonyl, which is good for environmental conservation.

The invention provides a purification method of indium back extraction solution, comprising the following steps: A, adding soluble ferrite in indium back extraction solution, and stirring for dissolving; B, under the condition of stirring, adding hydrogen peroxide, respectively oxidizing Fe2+ and Sn2+ in the solution into Fe3+ and Sn4+; C, adding sodium hydroxide till the pH value of the system is 2.0-2.5 so as to obtain neutralizer; and D, filtering so as to obtain scavenging solution and purifying residue. According to the purification method of indium back extraction solution provided by the invention, impurities in the indium back extraction solution such as ferrum, arsenium, stibium, bismuth, stannum and the like can be removed, the generation of poisonous gas hydrogen arsenide when indium back extraction solution displacement can be prevented, the consumption of zinc slabs in the displacement process is reduced, and conditions for obtaining high-grade crude indium in the next step are provided, and simultaneously valuable metals such as bismuth, stannum and the like are enriched so as to be beneficial for recycle. Simultaneously, the purification method provided by the invention is simple in technology, convenient to operate and low in production cost.

The invention discloses a method for recovering cadmium from soot containing cadmium and high arsenic. leaching residue of valence metals; (2) extraction: the leaching solution containing cadmium and arsenic elements is adjusted to pH 2.5-3.0 and then extracted to obtain cadmium-containing organic phase and arsenic-containing raffinate; (3) back extraction: cadmium-containing organic phase (4) Precipitation of cadmium: the cadmium sulfate solution is subjected to precipitation reaction with sodium sulfide to obtain cadmium sulfide; (5) arsenic solidification: soluble ferrous salt is added to the arsenic-containing raffinate, and the Enter the gaseous oxidant to react to obtain scorodite crystals. The invention first effectively extracts cadmium in the cadmium-containing high-arsenic soot through the extraction method, so that cadmium is separated from lead, iron, bismuth, etc., and at the same time, the safe disposal of arsenic is realized, and the highly toxic arsenic hydrogen gas is avoided in the process. production, economical and environmental protection.

The invention relates to a normal-temperature purifier for adsorbing arsenic hydride and hydrogen phosphide in an olefin tail gas, belonging to the atmospheric pollution purification field. The purifier comprises following components in percentages by mass: 0.5-5% of potassium permanganate, 1-10% of soluble copper salt, 1-10% of soluble zinc salt and 75-97.5% of active carbon; the active carbon is a carrier; the potassium permanganate, and the soluble copper salt and the soluble zinc salt are active components. The preparation method of the purifier comprises following steps: (1), preparing a mixed water solution of the potassium permanganate, the soluble copper salt and the soluble zinc salt; (2), loading the potassium permanganate, the soluble copper salt and the soluble zinc salt on the active carbon carrier by a dipping method to obtain a carrier loaded with active metals; and (3), drying the carrier loaded with active metals in a drying medium to obtain the finished product purifier. The purifier disclosed by the invention has the advantages of simple component, low cost and low usage cost; after the purification, the content of arsenic hydride and hydrogen phosphide is less than 10ppb (volume percentage).