38 results about "Hydrogen arsenide" patented technology

The invention provides a method for purifying a copper electrolyte through two-stage decoppering and two-stage electrodeposition. The method comprises the following steps that S1, first-stage electrodeposition decoppering is carried out on a to-be-purified copper electrolyte of which the concentration of cooper ions is greater than 42 g / L, so that the concentration of the cooper ions is reduced to29-35 g / L, and A-grade copper and a first-stage decoppered liquid are obtained respectively; S2, first-stage impurity removal is carried out on the first-stage decoppered liquid by adopting an arsenic precipitating agent, the arsenic precipitating agent is an antimony hydroxide hydrate, and first-stage impurity removal slag and a first-stage liquid after impurity removal are obtained respectively; S3, second-stage impurity removal is carried out on the first-stage liquid after impurity removal, so that the concentration of antimony and bismuth is reduced, and a second-stage liquid after impurity removal is obtained; S4, second-stage electrodeposition decoppering is carried out on the second-stage liquid after impurity removal, and a second-stage decoppered liquid of which the concentration of A-grade copper and copper ions is less than 25 g / L is obtained respectively. The method for purifying the copper electrolyte through the two-stage decoppering and two-stage electrodeposition hasthe advantages that it can be ensured that the quality of electro-deposited copper meets an A-class copper standard, the generation of arsenic hydride is avoided, the working environment is better, the impurity removal energy consumption is low, and the running cost is low.

The invention discloses an accurate and reliable method for measuring arsenic by an iodine solution absorption method, which solves the problem that the traditional method produces poisonous waste liquor. In a H2SO4 medium greater than 3.6N, Zn reacts with an acid to produce nascent activated hydrogen; in the presence of KI and acidic SnCl2, As<5+> is reduced into As<3+>, and the trivalent arsenic reacts with the nascent activated hydrogen to produce hydrogen arsenide gas; and the hydrogen arsenide gas is absorbed by an iodine solution and is oxidized into quinquevalent arsenic. In a 0.25 equivalent sulfuric acid medium, the quinquevalent arsenic reacts with ammonium molybdate to produce yellow heteromolybdoarsenic acid. The heteromolybdoarsenic acid is reduced into arsenic molybdenum blue by hydrazine sulfatefor for colorimetric determination. The method for measuring arsenic by iodine solution absorption and the colorimetric determination of the arsenic molybdenum blue is more suitable for the analysis of as in raw materials for copper smelting and semi-finished products of matte anode copper; moreover, the use of poisonous and hazardous reagents is avoided, and environment pollution is reduced.

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 method for purifying copper electrolyte with minimal chemical reacting dose, which belongs to the technical field of wet-process metallurgy. High-purity cathode copper, crude copper sulphate, black copper and nickel are obtained by the following steps of: removing copper by electro-deposition; evaporating and condensing liquid in vacuum after copper removal; crystallizing condensate after the copper removal to obtain copper sulfate; preparing electrolyte from which arsenic is removed; removing arsenic by the electro-deposition; and performing filter pressing on black copper slurry. Due to the adoption of the method of the invention, the electrolyte can be purified during copper electro-deposition and the arsenic is removed in the form of an arsenic-copper alloy, so that the production of hydrogen arsenide is controlled and the technical problem of realizing the purification of the copper electrolyte with the minimal chemical reacting dose is solved. The method has the advantages of capability of preventing invalid removal of the copper and effectively controlling the separation of polluting AsH3, simple operation, low energy consumption and suitability for copper electrolytic purification process.

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).