摘要:
The present invention relates to a process for separating at least one metal compound and/or a component thereof from a mixture, said process comprising contacting the said mixture with a heteropoly acid or heteropoly acid anion, thereby producing a precipitate comprising the heteropoly acid or heteropoly acid anion and the metal compound and/or a component thereof. The present invention further relates to a process for the purification of a mixture containing at least one metal compound, said process comprising contacting the said mixture with a heteropoly acid or heteropoly acid anion, thereby producing a precipitate that is substantially insoluble in the said reaction mixture and recovering the reaction mixture.
摘要:
A method for reducing the toxicity of onium compounds, such as ammonium compounds and phosphonium compounds, by the use of certain additives is described. Suitable additives include, but are not necessarily limited to, carboxylic acids (e.g. naphthenic acids), sulfonic acids, organophosphonic acids, phenolic compounds, ether sulfates, phosphoric acid esters, sulfonated fatty acids, sulfated fatty acids, oligocarboxylic acids, and mixtures thereof, and alkali metal salts of these compounds and amine salts of these compounds.
摘要:
The invention provides a process for removing polyamine chelating agents from aqueous solutions comprising oxidising the chelating agents with oxygen in the presence of an equivalent amount of a transition metal such as iron, followed by biologically reducing the chelates in the presence of an electron donor, and optionally by membrane filtration. The biological reduction is carried out with denitrifying and/or sulphate-reducing bacteria.
摘要:
Decribed are a process for the treatment of liquid residues from photographic processes, in which the residues are oxidized in stages and precipitated solids are then separated out, and in which the residues to be treated are subjected to:
(a) oxygen oxidization and (b) oxygen-supported mild anodic oxidization and then (c) ozone oxidization and (d) are freed of precipitated solids by filtration after pH value setting and loading of auxiliary substances and a device for performing this process.
摘要:
L'invention concerne un procédé pour éliminer des substances organiques en solution ou en suspension dans une solution aqueuse telle qu'un effluent radioactif. Selon l'invention, ces substances organiques qui sont par exemple des agents complexants tels que l'acide citrique, l'acide éthylène diamine tétracétique et l'acide tartrique sont détruites par oxydation au moyen d'ions Co³⁺. Dans ce but, on ajoute de préférence à la solution aqueuse un sel de cobalt(II) et on génère en continu par électrolyse les ions Co³⁺ nécessaires à l'oxydation. Le sel de cobalt(II) est de préférence le nitrate de cobalt.
摘要:
A process is provided for the waste treatment of metal plating solutions. One embodiment of the process comprises removal of the metal values contained in solution and inactivation or destruction of the complexing agent's ability to complex heavy metals. A second embodiment comprises inactivation or destruction of the complexing agent as a first step, formation of a sludge if not formed by inactivation of the complexing agent and sludge removal. Either embodiment permits direct discharge of spent plating solutions into the environment without violation of federal or municipal regulation.
摘要:
The present invention refers to a method to remove organic chemicals and organometallic complexes (organic heavy metal complexes) using zeolite from process water or tailings streams of a mineral processing plant where diethylenetriamine (DETA) or triethylenetetramine (TETA) is used as a flotation reagent and DETA-metal complexes are found in process water or tailings streams. In a preferred embodiment, the process water or slurry tailings streams of a mineral processing plant containing DETA, DETA-metal complexes and residual heavy metals are contacted with natural zeolite. This can be carried out by adding the natural zeolite to the process streams (slurries) while mixing with a mechanical mixer to efficiently adsorb DETA, DETA-metal complexes and heavy metals from the process streams (slurries) on the zeolite. The loaded zeolite is then discarded with the flotation tailings.