The present invention relates to a plant and to a process for producing a solid-state alkali metal cyanide product. In order to obtain a solid-state alkali metal cyanide product that has a good proportion by weight of alkali metal hydroxide, and in order to ensure that it remains as calm as possible in the plant during operation, it is proposed that the proportion by weight of alkali metal hydroxide in a suspension withdrawn from the crystallization vessel and sent to a solid-liquid separation device be increased before it enters the solid-liquid separation device.
The invention relates to a water-soluble receptacle which is suitable for accommodating an additive or an additive composition and is filled with an additive or an additive composition comprising at least one dye or at least one dye composition, wherein the water-soluble receptacle has a wall thickness in the range from 5 to 50 µm, and wherein the water-soluble receptacle comprises a water-soluble polymer composition or consists of a water-soluble polymer composition, wherein the polymer composition comprises:
a) at least one polyvinyl alcohol copolymer P1 having a degree of hydrolysis in the range from 75 to 95 mol%,
wherein the polyvinyl alcohol copolymer P1 is a copolymer which comprises
vinyl alcohol repeating units,
vinyl ester repeating units and
repeating units of at least one comonomer,
wherein the at least one comonomer is selected from pentaerythritol acrylate and pentaerythritol acrylate derivatives and also optionally acrylic acid; and/or
b) at least one polyvinyl alcohol P2 having a degree of hydrolysis in the range from 87 to 95 mol%;
wherein, in addition to the at least one polyvinyl alcohol copolymer P1 and/or the at least one polyvinyl alcohol P2, the polymer composition can additionally optionally contain additive substances;
wherein the polymer composition, in the case in which it comprises at least one polyvinyl alcohol copolymer P1 and no polyvinyl alcohol P2, has a content of repeating units of the at least one comonomer in a range from in total 10% to 20% by weight, based on the total weight of polyvinyl alcohol copolymer P1; and
wherein the polymer composition, in the case in which it comprises at least one polyvinyl alcohol copolymer P1 and at least one polyvinyl alcohol P2, has a content of repeating units of the at least one comonomer in a range from in total 10% to 20% by weight, based on the total weight of polyvinyl alcohol copolymer P1 and polyvinyl alcohol P2. The water-soluble receptacle can advantageously be used in a method for producing a coloured aqueous alkali metal cyanide solution. To this end, the water-soluble receptacle can be provided together with an alkali metal cyanide compound in the form of a composition Z1. The invention also relates to a method for producing said composition Z1 and to the use of said composition for producing a coloured aqueous alkali metal cyanide solution (composition Z2).
The invention relates to a water soluble container which is suitable for receiving an additive substance or a additive substance composition and is filled with an additive substance or an additive substance composition comprising at least one dye or at least one dye composition, wherein the water soluble container has a wall thickness in the range from 5 to 50 pm, and wherein the water soluble container comprises a water soluble polymer composition or consists of a water soluble polymer composition, which comprises: ? a) at least one polyvinyl alcohol copolymer Pl having a degree of hydrolysis in the range from 75 to 95 Mol%, and/or ? b) at least one polyvinyl alcohol P2 having a degree of hydrolysis in the range from 87 to 95 Mol%.
The invention relates to a water soluble container which is suitable for receiving an additive substance or a additive substance composition and is filled with an additive substance or an additive substance composition comprising at least one dye or at least one dye composition, wherein the water soluble container has a wall thickness in the range from 5 to 50 pm, and wherein the water soluble container comprises a water soluble polymer composition or consists of a water soluble polymer composition, which comprises: • a) at least one polyvinyl alcohol copolymer Pl having a degree of hydrolysis in the range from 75 to 95 Mol%, and/or • b) at least one polyvinyl alcohol P2 having a degree of hydrolysis in the range from 87 to 95 Mol%.
The invention relates to a process for the preparation of alkali metal cyanides as a solid substance, comprising the steps of: i) an absorption step in the form of an absorption of hydrogen cyanide from a hydrogen cyanide-containing synthesis gas in an aqueous alkali metal hydroxide solution; ii) a crystallization step in the form of introducing said alkali metal cyanide solution into an evaporative crystallizer; iii) a separation step; iv) a recycle step; v) a drying step.
B01D 21/26 - Séparation du sédiment avec emploi de la force centrifuge
B01D 53/14 - Séparation de gaz ou de vapeursRécupération de vapeurs de solvants volatils dans les gazÉpuration chimique ou biologique des gaz résiduaires, p. ex. gaz d'échappement des moteurs à combustion, fumées, vapeurs, gaz de combustion ou aérosols par absorption
B01D 53/96 - Régénération, réactivation ou recyclage des réactifs
The invention relates to a method for producing alkali metal cyanides as solids, comprising the steps: i) an absorption step in the form of the absorption of hydrogen cyanide from a syngas containing hydrogen cyanide in an aqueous alkali metal hydroxide solution; ii) a preparation step for the waste gases containing cyanide that have accumulated in step i); iii) a crystallization step in the form of the introduction of the alkali metal cyanide solution into an evaporative crystallizer; iv) a condensation step for the vapour containing cyanide that has accumulated in step iii) to obtain a vapour condensate containing cyanide; v) a recirculation step, in which the vapour condensate containing cyanide that has been obtained in step iv) is used as an aqueous liquid in step ii).
F23G 7/06 - Procédés ou appareils, p. ex. incinérateurs, spécialement adaptés à la combustion de déchets particuliers ou de combustibles pauvres, p. ex. des produits chimiques de gaz d'évacuation ou de gaz nocifs, p. ex. de gaz d'échappement
7.
Biological ore processing for the isolation of heavy metals
The invention provides an assay for identifying a bacterium capable of binding elemental heavy metal, comprising the following steps: cultivating a test bacterium in a suitable first culture medium; immersing at least a surface portion of a test tool into the first culture medium for a second predetermined period of time, said surface portion being coated by elemental heavy metal, respectively; removing said test tool from said first culture medium and optionally rinsing the test tool; contacting a second culture medium with the surface portion coated by elemental heavy metal of said test tool removed in the previous step; and identifying the test bacterium as being capable of binding elemental heavy metal from growth of the test bacterium in said second culture medium.
C22B 3/24 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation par des procédés physiques, p. ex. par filtration, par des moyens magnétiques par adsorption sur des substances solides, p. ex. par extraction avec des résines solides
C12N 1/22 - Procédés utilisant de la cellulose ou ses hydrolysats ou milieux de culture en contenant
C12N 1/34 - Procédés utilisant la culture en mousse
C22B 3/18 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés à l'aide de micro-organismes ou d'enzymes, p. ex. de bactéries ou d'algues
8.
Biological ore processing for the isolation of heavy metals
The invention provides a process of isolating or enriching a heavy metal present in a suspension containing a particulate mineral ore containing a heavy metal, comprising the following steps: incubating a suspension containing (i) a particulate mineral ore containing a heavy metal and (ii) biomass comprising a bacterium capable of binding the heavy metal; separating the biomass having bound heavy metal from the suspension of the previous step; and isolating the heavy metal from the biomass separated in the previous step.
C22B 3/18 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés à l'aide de micro-organismes ou d'enzymes, p. ex. de bactéries ou d'algues
C22B 3/24 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation par des procédés physiques, p. ex. par filtration, par des moyens magnétiques par adsorption sur des substances solides, p. ex. par extraction avec des résines solides
There is provided a process of isolating or enriching a heavy metal present in a suspension containing a particulate mineral ore containing the heavy metal, the process comprising: incubating a suspension containing (i) the particulate mineral ore containing the heavy metal, and (ii) biomass comprising a bacterium capable of binding the heavy metal; separating the biomass bound with the heavy metal from the suspension of the previous step; and isolating the heavy metal from the separated biomass. In the process, the heavy metal is gold and/or silver, the bacterium is selected from the following genera and species: Pseudochrobactrum, Bacillus subtilis, Bacillus pumilus, Stenotrophomonas, Bacillus cereus, Pseudomonas aeruginosa, and combinations thereof, and the biomass comprises at least 70% (w/w) of dead bacterial cells.
C22B 3/18 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés à l'aide de micro-organismes ou d'enzymes, p. ex. de bactéries ou d'algues
C22B 3/20 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation
There is provided an assay for identifying a bacterium capable of binding elemental heavy metal, comprising: cultivating test population of bacteria in a suitable first culture medium, said first culture medium contained in a container; immersing at least a surface portion of a test tuul ir itu LFii lust uulLui i i i iFUiuii i lui i SeuinIU pi et.luteilliiriuU pei iuU ul Liiiie,sdiU ui ldte pui Liu! hr4ing coated by the elemental heavy metal, respectively: removing said test tool from said first culture medium and optionally rinsing the test tool; contacting a second culture medium with the auricle. portion coated by the elemental heavy metal of oaid teat tool removed in the previouo step: and identifying a test bacterium from the test population of bacteria as being capable of binding fle elemernai neavy melai from growm or Ine lest oacIenurn in said second cutture medium.
C22B 3/18 - Extraction de composés métalliques par voie humide à partir de minerais ou de concentrés à l'aide de micro-organismes ou d'enzymes, p. ex. de bactéries ou d'algues
C22B 3/20 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation
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