The present invention provides a method for selective recovery of a valuable metal from a waste denitrification catalyst through alkali fusion, the method comprising the steps of: (a) adding an alkali metal to a waste denitrification catalyst, followed by mixing and alkali fusion, to generate a calcination product; (b) subjecting the calcination product to water-leaching to recover an alkali leachate and a residue; (c) adding a precipitator to the alkali leachate, followed by stirring, to recover calcium metavanadate (Ca(VO.sub.3).sub.2) or calcium tungstate (CaWO.sub.4) through precipitation; and (d) subjecting the recovered calcium tungstate to acid decomposition to prepare tungstic acid. Therefore, vanadium and tungsten can be recovered at high efficiency by a method in which a precipitator is added to a leachate, which is obtained by adding an excess amount of an alkali metal to a waste denitrification catalyst and carrying out calcination and water-leaching, and then a reaction rate is controlled.

A purification process for recycled graphite for use as anode material in Li-ion batteries includes a sequence of leaching and heat treatment followed by washing with deionized (DI) water and an acid wash. A graphite source results from a suitable process such as acid leaching of black mass from a battery recycling stream, where the leach removes a substantial portion of metal salts used for cathode materials. Impurities, most notably aluminum oxide and residual cathode materials, are often present in trace amounts in the graphite source. A sequence of heating (sintering) and pH adjusted washing further purifies the graphite into a modified, recycled graphite exceeding 99.5% purity for use in a recycled battery.

A purification process for recycled graphite for use as anode material in Li-ion batteries includes a sequence of leaching and heat treatment followed by washing with deionized (DI) water and an acid wash. A graphite source results from a suitable process such as acid leaching of black mass from a battery recycling stream, where the leach removes a substantial portion of metal salts used for cathode materials. Impurities, most notably aluminum oxide and residual cathode materials, are often present in trace amounts in the graphite source. A sequence of heating (sintering) and pH adjusted washing further purifies the graphite into a modified, recycled graphite exceeding 99.5% purity for use in a recycled battery.

Provided is a method for producing coarse particles of high purity nickel powder from a nickel ammine sulfate complex solution using industrially-inexpensive hydrogen gas and fine nickel powder. The method for producing nickel powder, including performing the following processes (1) to (5), wherein a sulfuric acid solution containing nickel and cobalt is subjected to (1) a pH adjusting step, (2) a solvent extraction step, (3) a complexing step for obtaining a nickel ammine sulfate complex solution, (4) a reduction step for obtaining a reduced slurry containing nickel powder, and (5) a solid-liquid separation step of performing solid-liquid separation to obtain nickel powder and a solution after reduction, and solution after reduction repeatedly using the solution after reduction in either or both of (2) the solvent extraction step and (3) the complexing step.

Provided is a method for producing coarse particles of high purity nickel powder from a nickel ammine sulfate complex solution using industrially-inexpensive hydrogen gas and fine nickel powder. The method for producing nickel powder, including performing the following processes (1) to (5), wherein a sulfuric acid solution containing nickel and cobalt is subjected to (1) a pH adjusting step, (2) a solvent extraction step, (3) a complexing step for obtaining a nickel ammine sulfate complex solution, (4) a reduction step for obtaining a reduced slurry containing nickel powder, and (5) a solid-liquid separation step of performing solid-liquid separation to obtain nickel powder and a solution after reduction, and solution after reduction repeatedly using the solution after reduction in either or both of (2) the solvent extraction step and (3) the complexing step.

A method for charging pallet cars of a traveling grate for the thermal treatment of bulk material includes in a first step a first layer is applied as a hearth layer on a grate surface of the pallet car. In at least one second step a second layer at the same time or successively is applied as a side layer on two opposed side walls of the pallet car and a third layer is applied as green pellet layer between the side layers and on the hearth layer. The pellets used for the grate and the side layer differ in terms of their diameter and size distribution.

A metal agglomerate production configuration including an induration apparatus configured to provide a metal oxide material manufacturing thermal process (MTE) including indurating a metal ore material into a metal oxide material and a method of production of metal agglomerates. A cooler device is configured for cooling the metal oxide material discharged from the induration apparatus and includes a first heat transferring arrangement configured for transferring a first heat energy content (HE) to the induration apparatus, which first heat energy content (HE) is recovered from the metal oxide material holding the thermal energy (TE). The configuration includes a second heat transferring arrangement configured for transferring a second heat energy content (HE) from the induration apparatus to the cooler device for cooling of the metal oxide material, which second heat energy content (HE) is recovered from the metal oxide material manufacturing thermal process (MTE).

A metal agglomerate production configuration including an induration apparatus configured to provide a metal oxide material manufacturing thermal process (MTE) including indurating a metal ore material into a metal oxide material and a method of production of metal agglomerates. A cooler device is configured for cooling the metal oxide material discharged from the induration apparatus and includes a first heat transferring arrangement configured for transferring a first heat energy content (HE) to the induration apparatus, which first heat energy content (HE) is recovered from the metal oxide material holding the thermal energy (TE). The configuration includes a second heat transferring arrangement configured for transferring a second heat energy content (HE) from the induration apparatus to the cooler device for cooling of the metal oxide material, which second heat energy content (HE) is recovered from the metal oxide material manufacturing thermal process (MTE).

To provide a method for producing agglomerated ore, with which reduced iron can be efficiently produced by hydrogen reduction, without the need for preheating raw material and raising the temperature of reducing gas. A method for producing agglomerated ore, the method including sintering a sintering raw material containing an iron-containing raw material and a condensation material in a sintering machine to form a sinter cake, and obtaining agglomerated ore by crushing the sinter cake, in which iron oxide contained in the sinter cake is reduced by distributing a reducing gas through the sinter cake on the sintering machine, to make a degree of reduction of iron oxide contained in the agglomerated ore after crushing 50% or more.

To provide a method for producing agglomerated ore, with which reduced iron can be efficiently produced by hydrogen reduction, without the need for preheating raw material and raising the temperature of reducing gas. A method for producing agglomerated ore, the method including sintering a sintering raw material containing an iron-containing raw material and a condensation material in a sintering machine to form a sinter cake, and obtaining agglomerated ore by crushing the sinter cake, in which iron oxide contained in the sinter cake is reduced by distributing a reducing gas through the sinter cake on the sintering machine, to make a degree of reduction of iron oxide contained in the agglomerated ore after crushing 50% or more.