Abstract: A method for recovering active metals of a lithium secondary battery comprises collecting a cathode active material mixture from the cathode of the lithium secondary battery; subjecting the cathode active material mixture to a reducing reaction to prepare a preliminary precursor mixture; forming an aqueous lithium precursor solution from the preliminary precursor mixture; and collecting an aluminum-containing material from the aqueous lithium precursor solution with an aluminum removing resin.

Abstract: A method for preparing a pretreated product for recovering valuable metals of a lithium secondary battery includes: preparing a cathode active material mixture from a cathode of the lithium secondary battery; drying or pulverizing the cathode active material mixture; and classifying the dried or pulverized cathode active material mixture to have an average particle diameter (D50) of 400 ?m or less. Flowability may be increased by reducing the average particle diameter before reduction treatment.

Abstract: In a method for recycling a lithium precursor of the present invention, cathode active material powders including lithium composite oxide particles and having different particle sizes are prepared. A preliminary precursor mixture is prepared by reducing the cathode active material powders in a fluidized bed reactor including a reactor body whose cross-sectional diameter is decreased stepwise or gradually from an upper portion to a lower portion. Subsequently, a lithium precursor is recovered from the preliminary precursor mixture.

Abstract: In a method for recovering an active metal of a lithium secondary battery, a preliminary cathode active material mixture is prepared from a cathode of a waste lithium secondary battery, the preliminary cathode active material mixture is fluidized through oxygen-containing gas within a fluidized bed reactor to form a cathode active material mixture, reductive gas is injected into the fluidized bed reactor to form a preliminary precursor mixture from the cathode active material mixture, and a lithium precursor is recovered from the preliminary precursor mixture.

Abstract: In a method for recovering an active metal of a lithium secondary battery, a sulfuric acid solution is added to a lithium metal composite oxide so as to prepare a sulfated active material solution. A transition metal is extracted from the sulfated active material solution. A lithium precursor is recovered by adding a lithium extracting agent to the solution remaining after the transition metal has been extracted from the sulfated active material solution. In the method, the amount of impurities is reduced, and sulfuric acid and the neutralizing agent can be recycled so that a high-yield lithium precursor recovery is enabled.

Abstract: In a method for recovering active metals from a lithium secondary battery according to exemplary embodiments, a cathode active material mixture including a lithium composite oxide may be reacted with a reducing reaction gas under a pressurized condition and washed with water. In this case, a large amount of the cathode active material mixture may be treated within a shortened process time, and the active metal may be recovered with high yield and high efficiency.

Abstract: A method for recovering an active metal of a lithium secondary battery according to exemplary embodiments comprises preparing a preliminary cathode active material mixture including a lithium composite oxide and a binder, forming a cathode active material mixture by removing the binder from the preliminary cathode active material mixture through a heat treatment in a fluidized bed reactor, and recovering a lithium precursor from the cathode active material mixture. Accordingly, the active metal of the lithium secondary battery can be recovered with high purity and high efficiency.

Abstract: In a method for recovering an active metal of a lithium secondary battery, a cathode active material mixture is prepared from a cathode of a lithium secondary battery. A first reductive process using a first reductive reaction gas and a second reductive process using a second reductive reaction gas that has a higher reaction source concentration than that of the first reductive reaction gas are performed sequentially and continuously to convert the cathode active material mixture into a preliminary precursor mixture. A lithium precursor is recovered from the preliminary precursor mixture. A lithium recovery ratio may be increased by a stepwise reduction while preventing an increase of heating value.

Abstract: In a method of recovering an active metal of a lithium secondary battery, a cathode active material mixture is prepared from a waste cathode of a lithium secondary. The cathode active material mixture is reacted with a reductive reaction gas to form a preliminary precursor mixture having a reduction degree of transition metal defined by Equation 1 in a range from 0.24 to 1.6. A lithium precursor is recovered from the preliminary precursor mixture. A lithium recovery rationis improved by adjusting the reduction degree of transition metal.

Abstract: In a method for recovering an active metal of a lithium secondary battery according to an embodiment, a waste cathode active material mixture is prepared from a waste cathode of a lithium secondary battery. A preliminary precursor mixture is formed by reacting the waste cathode active material mixture with a reactive gas in a fluidized bed reactor. The preliminary precursor mixture is cooled by spraying different first and second refrigerants to the preliminary precursor mixture. A lithium precursor is recovered from the cooled preliminary precursor mixture.

Abstract: A fluidized bed reactor according to an embodiment of the present disclosure includes a reactor body, and a dispersion plate coupled to a bottom portion of the reactor body. The dispersion plate may include a base plate and injection columns protruding from a top surface of the base plate. The injection columns include first injection columns arranged at a central portion of the dispersion plate, and second injection columns arranged at a peripheral portion of the dispersion plate. The second injection column has a greater height than a height of the first injection column. A reactive gas is uniformly injected to a wall surface of the reactor through the dispersion plate, thereby increasing a recovery ratio for an active metal of a lithium secondary battery.

Abstract: A method of recovering an active metal of a lithium secondary battery according to an embodiment of the present invention includes preparing a waste cathode active material mixture obtained from a waste cathode of a lithium secondary battery, forming a preliminary precursor mixture by reacting the waste cathode active material mixture with a reactive gas in a fluidized bed reactor, and selectively recovering a lithium precursor from the preliminary precursor mixture. The fluidized bed reactor includes a reactor body and a horizontal expansion bed, and a ratio of a diameter of the horizontal expansion bed relative to a diameter of the reactor body is 3 or more to improve a recovery efficiency of a lithium secondary battery.

Abstract: In a recovery method for a lithium precursor according to embodiments of the present invention, a cathode active material mixture including a lithium composite oxide is prepared. The cathode active material mixture is reacted with a carbon-based solid material in an atmosphere of an inert gas to form a preliminary precursor mixture containing lithium oxide. A washing treatment of the preliminary precursor mixture is performed to separate a lithium precursor. The lithium precursor can be recovered with high yield and high efficiency.

Abstract: A method for isolating a lithium precursor according to an embodiment of the present disclosure includes preparing a preliminary precursor mixture including a preliminary lithium precursor and a preliminary transition metal precursor, mixing the preliminary precursor mixture and a precipitation liquid in a reactor to form a precursor mixture, and injecting a non-reactive gas into the precursor mixture. Accordingly, the lithium precursor can be isolated with high yield and high efficiency.

Abstract: A method of producing carbon nanotubes in a fluidized bed reactor includes preparing a carbon nanotube by supplying a catalyst and a carbon source to an interior of the fluidized bed reactor having an internal pressure of 0.5 barg to 1.2 barg (gauge pressure), thereby improving the yield and purity of carbon nanotubes.

Abstract: Provided is a method of producing carbon nanotubes by supplying a catalyst and a carbon source to a fluidized bed reactor. The fluidized bed reactor has an expanded zone. A flow velocity (linear velocity) of a raw material supplied to the fluidized bed reactor is equal to or higher than a terminal velocity of an internal material in the fluidized bed reactor.

Abstract: A method for recovering an active metal of a lithium secondary battery according to an embodiment of the present application whereby a cathode active material mixture obtained from a used cathode of a lithium secondary battery is prepared, and the cathode active material mixture is reacted in a fluidized bed reactor to form a preliminary precursor mixture. A lithium precursor is recovered from the preliminary precursor mixture. Yield and selectivity of a lithium precursor can be improved using the fluidized bed reactor.

Abstract: A method for recovering an active metal of a lithium secondary battery according to an embodiment of the present application whereby a used lithium-containing mixture is prepared, and the used lithium-containing mixture is treated with a hydrogen reduction to prepare a preliminary precursor mixture. The preliminary precursor mixture is washed with water to generate a lithium precursor including lithium hydroxide. Lithium hydroxide can be obtained by the washing treatment with high purity.

Abstract: The present invention provides a method for preparing anhydrosugar alcohol, in which the reaction temperature in a vacuum reaction that converts sugar alcohol into anhydrosugar alcohol is controlled to two steps of temperature that is, a first-step low reaction temperature of 100 to 150° C. and a second-step high reaction temperature of 151 to 240° C., so that the selectivity for the intermediate product 1,4-sorbitan can be increased, thereby increasing the yield of anhydrosugar alcohol.

Abstract: The present invention relates to a method of producing anhydrosugar alcohol by dehydrating sugar alcohol at high pressure in the presence of a catalyst which is less acidic than a conventional sulfuric acid catalyst and which can suppress side reactions at high temperature. According to the present invention, anhydrosugar alcohol can be produced in a yield similar to that in a vacuum reaction.