An object of the present invention is to provide a method for producing an alloy recycled material by effectively removing carbon from a carbon-containing alloy, which is produced as scrap or sludge of an RFeB based permanent magnet, a used magnet, or the like. The method of the present invention as a means for resolution is characterized in that a carbon-containing RFeB based permanent magnet alloy is subjected to an HDDR treatment to remove carbon. An alloy recycled material produced by the method of the present invention contains a reduced amount of carbon. Therefore, in the case where it is recycled for the production of a magnet, even when an increased amount is subjected to high-frequency heating in a vacuum melting furnace, a non-negligible increase in the amount of carbon contained in the produced magnet can be avoided.

An object of the present invention is to provide a method for recovering a rare earth element, including subjecting a workpiece containing at least a rare earth element and an iron group element to an oxidation treatment, then turning the treatment environment into an environment where carbon is present, and subjecting an oxidation-treated workpiece to a heat treatment, thereby separating a rare earth element in the form of an oxide from an iron group element, according to which an oxide of a rare earth element can be efficiently separated from an iron group element at low treatment cost, and also wear and damage to the treatment container can be suppressed to allow the container to be used repeatedly for a long period of time. The method of the present invention as a means for resolution is characterized in that the oxidation-treated workpiece is mixed with petroleum coke as a carbon supply source, placed in a treatment container, and then subjected to the heat treatment in an inert gas atmosphere or in vacuum at a temperature of 950 C. to 1150 C. (excluding 1150 C.).

The present invention relates to a method of treating lead anode slime having high fluorine and arsenic content, in particular to a method comprising smelting of the lead anode slime and cleaning the produced off gases in a one or more wet gas cleaning stages.

A method for recovering lead from lead-containing discarded electronic waste cathode ray tube glass includes the steps of taking a sample of cathode ray tube lead-containing funnel glass, crushing to obtain CRT glass powder, then uniformly mixing zero-valent iron powder with the CRT glass powder according to the mass ratio of 0.1-1.5:1, performing heat preservation at a temperature of 610-960 C. for 3-180 min, and further cooling to extract the metallic lead from a SiO.sub.2 reticular glass structure of the CRT glass. This can be applied to pretreatment of the lead-containing waste CRT glass, and the metallic lead is extracted from the reticular silicate structure of the lead-containing waste CRT glass by adding the zero-valent iron in the thermal treatment process so that disposal rate of electronic wastes is improved and ecological safety is ensured. This method has important environmental, social and economic significance and broad application prospects.

A method and a device for recovering hydrogen pulverized powder of a raw-material alloy for rare-earth magnets capable of lowering the possibility that hydrogen pulverized powder remains in a recovery chamber; therefore, enhancing magnetic properties by reducing an oxygen content of an obtained rare-earth magnet. A processing container 50 is carried into a recovery chamber 40 from a processing chamber after inert gas is introduced into the recovery chamber 40. The raw-material alloy for rare-earth magnets in the processing container 50 is discharged into the recovery chamber 40 after the pressure in the recovery chamber 40 is reduced Thereafter, inert gas is introduced into the recovery chamber 40, and the raw-material alloy for rare-earth magnets is recovered into the recovery container 50 after a pressure in the recovery chamber 40 is set to a predetermined pressure by inert gas.

The present invention relates to a technique for recovering and recycling a platinum paste. The present invention provides a method for recovering a metal powder from a platinum paste formed by mixing a solid component composed of a metal powder including at least a platinum powder or a platinum alloy powder and an organic component including at least an organic solvent, the method including removing the organic component by heating the platinum paste at a recovery temperature set in a temperature range of 300 C. or higher and 500 C. or lower. The recovered metal powder can be recycled into a platinum paste equivalent to a new product by mixing the metal powder with a solvent etc.

A method for plasma treatment of wet metal-containing wastes in which a plasma treatment unit comprises an electrically conductive hearth for holding a layer of slag and optionally a layer of metal produced by the plasma treatment. A graphite electrode is arranged above the hearth, so that, in use, a plasma arc is formed between the electrode and the hearth. One or more inlets for the particulate metal-containing waste are arranged adjacent to the electrode and sufficiently close to the electrode so that, in use, the particulate metal-containing waste fed into the plasma treatment unit falls close to the arc formed between the electrode and the hearth and is heated by the plasma arc before contacting the slag layer such that moisture present in the particulate metal-containing waste is completely volatilized in a head space of the furnace.

Extracting gallium and/or arsenic from materials comprising gallium arsenide is generally disclosed. In some example embodiments, a material comprising gallium arsenide may be exposed to a first heating condition to form a first exhaust. The first exhaust may be directed to an arsenic collection bed including aluminum, which may form aluminum arsenide. The material including gallium arsenide may be exposed to a second heating condition and/or a vacuum may be applied, which may form a second exhaust. The second exhaust may be directed to a gallium collection bed including aluminum, which may form gallium alloys of aluminum.

A method for separating an amount of osmium from a mixture containing the osmium and at least one other additional metal is provided. In particular, method for forming and trapping OsO.sub.4 to separate the osmium from a mixture containing the osmium and at least one other additional metal is provided.

A system for and a method of processing a waste lithium-ion battery make it possible to improve heat treatment efficiency and to heat-treat a large-sized waste lithium-ion battery without disassembling the battery. One example of the system for processing a waste lithium-ion battery includes a heater that heat-treats a waste lithium-ion battery at a heating temperature of lower than 400 C. to decompose and remove an electrolyte solution from the waste lithium-ion battery.