摘要:
A sublimation/distillation apparatus including a crucible with an open end, a heating device thermally coupled to the crucible, an actively cooled collection substrate disposed above the open end of the crucible, and a vacuum chamber housing the crucible, the heating device, and the actively cooled collection substrate.
摘要:
Processes for recovering an organic solvent extractant phase from a solid-stabilized emulsion formed in a hydrometallurgical solvent extraction circuit are disclosed. One such process includes mixing a de-emulsifier comprising an effective amount of a polymeric aggregating agent with the solid-stabilized emulsion, thereby separating the emulsion into its aqueous, organic, and solid phase components; and removing the organic solvent extractant phase from the other components, thereby recovering the organic solvent extractant phase from the solid-stabilized emulsion.
摘要:
The invention relates to a process for separating, in an aqueous medium, at least one actinide element from one or more lanthanide elements by using at least one molecule which sequesters the said actinide element to be separated and membrane filtration, the said process successively comprising: a) a step of bringing at least one molecule which sequesters the said actinide element in contact with the aqueous medium, the said molecule not being retained in the non-complexed state by the said membrane and being capable of forming a complex with the actinide element to be separated, comprising the said element and at least two of the said sequestering molecules, which complex is capable of being retained by the membrane; b) a step of passing the aqueous medium over the membrane in order to form a permeate on one side, comprising an aqueous effluent depleted of the said actinide element, and a retentate comprising the said complex.
摘要:
The present invention provides a composition and process using the composition for removing metal ions from aqueous process solutions. These compositions include a non-metallic compound and a suitable carrier. In one embodiment, the non-metallic compound is a thiuram. In another embodiment, the non-metallic compound can further include a dithiocarbamate. These compositions are contacted with the metal ions in the aqueous process solution having a wetting agent to form an organometallic complex precipitate. The precipitate can then be separated from the aqueous solution.
摘要:
The present invention provides a composition and process using the composition for removing metal ions from aqueous process solutions. These compositions include a non-metallic compound entrapped within or supported onto a substrate. In one embodiment, the non-metallic compound is a thiuram. In another embodiment, the compositions further include non-metallic compound that is a dithiocarbamate. These compositions are contacted with the metal ions in the aqueous process solution to form an organometallic complex precipitate.
摘要:
The present invention is directed to a process for reducing the passive layer on a metal. The process includes reacting a treatment composition having a non-metallic compound with metal ions in the passive layer of a metal, thereby forming an organometallic complex precipitate, and removing the organometallic complex precipitate. In one embodiment the non-metallic compound is a thiuram. In another embodiment, the treatment composition further includes a non-metallic compound that is a dithiocarbamate.
摘要:
The present invention provides a composition and process using the composition for removing metal ions from aqueous process solutions. These compositions include a non-metallic compound entrapped within or supported onto a substrate. In one embodiment, the non-metallic compound is a thiuram. In another embodiment, the compositions further include non-metallic compound that is a dithiocarbamate. These compositions are contacted with the metal ions in the aqueous process solution to form an organometallic complex precipitate.
摘要:
Processes for recovering an organic solvent extractant phase from a solid-stabilized emulsion formed in a hydrometallurgical solvent extraction circuit are disclosed. One such process includes mixing a de-emulsifier comprising an effective amount of a polymeric aggregating agent with the solid-stabilized emulsion, thereby separating the emulsion into its aqueous, organic, and solid phase components; and removing the organic solvent extractant phase from the other components, thereby recovering the organic solvent extractant phase from the solid-stabilized emulsion.
摘要:
A method for removing a metal from a metal-containing solution comprising contacting the metal-containing solution with a metal-removing composition comprising a substrate, an organic ion, and a metal binding agent, and recovering a solution having a lowered metal concentration when compared to the metal-containing solution. A composition comprising a substrate, an organic ion, and a metal binding agent, wherein the substrate comprises a natural clay, a synthetic clay, a natural zeolite, a synthetic zeolite, a polymer resin, lignite, kaolinite, serpentine, illite, chlorite, smectite, montmorillonite, saponite, sepiolite, nontronite, beidellite, hectorite, fuller's earth, attapulgite, bentonite, analcime, chabazite, heulandite, natrolite, phillipsite, stilbite, diethyl aminoethyl, quaternary aminoethyl, or combinations thereof, wherein the organic ion comprises quaternary amines, imidazolium salts, phosphonium salts, tetra alkyl ammonium, bis-(hydrogenated tallow)-dimethyl-ammonium chloride, bis-(hydrogenated tallow)-benzyl-methyl-ammonium chloride, 4,5-dihydro-1-methyl-2-nortallow-alkyl-1-(2-tallow-amidoethyl)-imidazolium methyl sulfate, 1-ethyl-4,5-dihydro-3 -(2-hydroxyethyl)-2-(8-heptadecenyl)-imidazolium ethyl sulfate, or combinations thereof, and wherein the metal-binding agent comprises mercaptan, carboxylic acid, chelating agents, amines, esters, carboxylic acids, alcohols, ethers, aldehydes, ketones, alkenes, alkynes, mercaptans, thiols, tert-dodecanethiol, nonanethiol, octanethiol, n-stearic acid, iso-stearic acid, palmitic acid, or combinations thereof.
摘要:
The present invention provides a composition and process using the composition for removing metal ions from aqueous process solutions. These compositions include a non-metallic compound entrapped within or supported onto a substrate. In one embodiment, the non-metallic compound is a thiuram. In another embodiment, the compositions further include non-metallic compound that is a dithiocarbamate. These compositions are contacted with the metal ions in the aqueous process solution to form an organometallic complex precipitate.