The present invention concerns a process for the separation of a gas mixture containing CO.sub.2 and at least one inert gaseous species, comprising (a) feeding the gas mixture into an adsorption column via a first inlet located at a first side of the column, wherein the adsorption column contains a solid CO.sub.2 sorbent loaded with H.sub.2O molecules and thereby desorbing H.sub.2O molecules and adsorbing CO.sub.2 molecules, to obtain a sorbent loaded with CO.sub.2 and an inert product stream; and then (b) feeding a stripping gas comprising H.sub.2O into the adsorption column via a second inlet located at a second side which is opposite to the first inlet, thereby stripping the sorbent and desorbing CO.sub.2 molecules and adsorbing H.sub.2O molecules, to obtain a sorbent loaded with H.sub.2O and the CO.sub.2 product stream, wherein the adsorption column is re-used in step (a) after being stripped in step (b). The invention also concerns an apparatus for performing the process according to the invention.

The present invention provides a method, and device for the separation and recovery of heavy metal ions by membrane-forming mineralization fixation, which belongs to the field of acid wastewater treatment technology containing heavy metal ions, comprises the following steps: mixing the composite mineral particles with the heavy metal acidic wastewater, performing a first hydration reaction under a standing condition, and performing adsorption-precipitation-crystallization on the heavy metal ions in the heavy metal acidic wastewater by the obtained colloidal liquid membrane to obtain particles with an outer layer having a mineralized membrane; the particles having a mineralized membrane in the outer layer have a spacing between the mineralized membrane and the particles; separating the particles having a mineralized membrane in the outer layer, and then respectively recovering the same; the process for the preparation method of the composite mineral particles comprises the following steps: mixing sodium carbonate/sodium silicate, bentonite, carbide slag and water, performing a second hydration reaction, and then successively performing granulation, aging, and dehydration condensation to obtain composite mineral particles; the particle size of the bentonite and carbide slag are independently 74 m. The present invention can realize the separation and recovery of heavy metal ions by membrane-forming mineralization fixation and waste control by waste.

A method for producing a hydrogen fluoride adsorbent having a high adsorption capacity of hydrogen fluoride including: an adsorption step of bringing hydrogen fluoride-containing gas that contains hydrogen fluoride and dilution gas for diluting the hydrogen fluoride where a concentration of the hydrogen fluoride is 0.5% by volume or more and 60% by volume or less into contact with a metal fluoride such that the hydrogen fluoride in the hydrogen fluoride-containing gas is adsorbed on the metal fluoride in a proportion of 2% by mass or more and 25% by mass or less; and a desorption step of heating the metal fluoride on which the hydrogen fluoride is adsorbed in the adsorption step in heat treatment atmosphere gas at a temperature of 240 C. or lower such that the adsorbed hydrogen fluoride is desorbed from the metal fluoride.

A lithium adsorbent includes an aluminum-based adsorbing material, a binder, and a wetting and dispersing agent. The binder includes at least one of a vinylidene fluoride-chlorotrifluoroethylene (VDF-CTFE) copolymer and a fluoroolefin-vinyl ether copolymer. The wetting and dispersing agent includes one or more of polyethylene glycol, sodium polyacrylate, polyvinyl alcohol, and formaldehyde condensate.

A monolithic substrate includes a dried and/or cured product of an extruded extrudable paste. The extrudable paste includes a hollow and/or porous material. The extrudable paste also includes a binder. The monolithic substrate has a bulk density of 60 g/L to 170 g/L.