Abrégé

A method for releasing impurities from a calcium-based mineral is described. The method comprises reacting a calcium-based mineral containing impurities with an aqueous solution of one or more ionic salts at a temperature of approximately 85° C. or above, wherein at least one of the calcium-based mineral and the one or more ionic salts comprises sulphate and at least one of the calcium-based mineral and the one or more ionic salts comprises ammonium, and wherein the concentration of the solution is approximately 25% or higher mass fraction, such that double salt crystals are formed and impurities are released. The method further comprises separating the double salt crystals from the impurities. Various products of the process are also described.

Classes IPC  ?

• C01F 11/02 - Oxydes ou hydroxydes
• C01F 11/18 - Carbonates
• C01F 11/46 - Sulfates
• C01F 11/48 - Sulfites
• C09D 13/00 - Mines de crayonCompositions de pastelsCompositions de craies
• B43K 19/00 - Crayons à mine non réglableStylesPastelsCraies
• B43K 19/16 - Fabrication de crayons à mine non réglable

Abrégé

A method for releasing impurities from a calcium-based mineral is described. The method comprises reacting a calcium-based mineral containing impurities with an aqueous solution of one or more ionic salts at a temperature of approximately 85°C or above, wherein at least one of the calcium-based mineral and the one or more ionic salts comprises sulphate and at least one of the calcium-based mineral and the one or more ionic salts comprises ammonium, and wherein the concentration of the solution is approximately 25% or higher mass fraction, such that double salt crystals are formed and impurities are released. The method further comprises separating the double salt crystals from the impurities. Various products of the process are also described.

Classes IPC  ?

• C01F 11/46 - Sulfates
• C01F 11/18 - Carbonates
• C01C 1/24 - Sulfates d'ammonium

Abrégé

The present invention relates to a process for extracting a gas component from a gas mixture, said process comprising the steps of: providing a gas mixture; passing the gas mixture through a sorbent medium, thereby selectively extracting said component; and recycling the sorbent medium; wherein the sorbent medium includes a concentration gradient.

Classes IPC  ?

• 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
• F28C 3/08 - Autres appareils échangeurs de chaleur à contact direct les sources de potentiel calorifique étant un liquide et un gaz ou une vapeur avec changement d'état, p. ex. absorption, évaporation, condensation

Abrégé

The invention concerns a capture tank for capturing a captive target compound from a gaseous and/or vaporous mixture comprising at least the captive target compound and one other material, or for capturing, concentrating or crystallising a target compound from a liquid mixture or solution comprising the target compound and at least one other material, the capture tank comprising an enclosure having a top region, a bottom region and at least one side defining the enclosure, the enclosure being at least partly open in its top region in order to communicate in use of the capture tank with the gaseous and/or vaporous mixture and for permitting ingress of a gaseous and/or vaporous mixture into the enclosure; the enclosure communicating in its bottom region with a reservoir for receiving the captured captive target compound; having means associated with its at least one side and/or its bottom region for permitting egress from the enclosure of the gaseous and/or vaporous mixture in at least partially captive target compound-depleted form; and having means for sparging at least partially through the enclosure from top to bottom a liquid mixture or solution for entraining the gaseous and/or vaporous mixture in the enclosure and carrying the entrained gaseous and/or vaporous mixture towards the bottom region of the enclosure, and a process for its operation.

Classes IPC  ?

• 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 53/18 - Unités d'absorptionDistributeurs de liquides
• B01D 53/62 - Oxydes de carbone
• B01D 53/78 - Procédés en phase liquide avec un contact gaz-liquide