Abstract

Provided is a method for efficiently recovering various types of metal, including rare metals, noble metals and other metals, from waste electronic substrates. This method of recovering metal from waste electronic substrates involves: a melting step for melting waste electronic substrates together with glass to form a glass phase, and a metal phase resulting from the metal contained in the waste electronic substrate and/or the glass; a metal recovery step for recovering the metal phase by separation from the glass phase; and an acid extraction step for bringing the glass phase into contact with an acid solution. The glass phase includes a first phase in which silica is the main component, and a second phase which has a higher solubility in the acid solution than the first phase. In the acid extraction step, the second phase is dissolved in the acid solution together with the residual metal contained in said second phase, and the acid solution with the dissolved residual metal is recovered.

IPC Classes  ?

• C22B 1/00 - Preliminary treatment of ores or scrap
• B09B 3/00 - Destroying solid waste or transforming solid waste into something useful or harmless
• B09B 5/00 - Operations not covered by a single other subclass or by a single other group in this subclass
• C22B 7/00 - Working-up raw materials other than ores, e.g. scrap, to produce non-ferrous metals or compounds thereof
• C22B 9/10 - General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor
• C22B 11/00 - Obtaining noble metals

Abstract

Provided is a method for separating heavy metals from glass at a low cost and in an efficient manner. The method for separating heavy metals from glass is provided with a step for vaporizing and separating heavy metals as chlorides by means of baking glass powder containing heavy metals at 900-1400°C in the presence of a chlorinating agent, and the baking is performed in the presence of a hydroxide.

IPC Classes  ?

• B09B 3/00 - Destroying solid waste or transforming solid waste into something useful or harmless
• C01B 33/18 - Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof

Abstract

Provided is a method for separating a heavy metal from a glass with high efficiency and at low cost. The present invention provides a method for separating a heavy metal from a glass containing a heavy metal oxide and a silica, comprising: a reduction/phase separation step of melting the glass together with a reducing agent and a phase separation accelerator to reduce the heavy metal oxide and, at the same time, produce a silica phase and a glass phase comprising a second phase having higher solubility in an acid solution than that of the silica phase; a heavy metal collection step of separating a heavy metal produced by the above-mentioned reduction from the glass phase and collecting the heavy metal; and an acid extraction step of bringing the glass phase into contact with an acid solution to dissolve the second phase together with a remaining portion of the heavy metal in the acid solution.

IPC Classes  ?

• B09B 3/00 - Destroying solid waste or transforming solid waste into something useful or harmless
• C02F 1/58 - Treatment of water, waste water, or sewage by removing specified dissolved compounds
• C02F 1/62 - Heavy metal compounds
• C02F 1/64 - Heavy metal compounds of iron or manganese
• C03C 15/00 - Surface treatment of glass, not in the form of fibres or filaments, by etching
• C22B 3/04 - Extraction of metal compounds from ores or concentrates by wet processes by leaching
• C22B 5/10 - Dry processes by solid carbonaceous reducing agents
• C22B 7/00 - Working-up raw materials other than ores, e.g. scrap, to produce non-ferrous metals or compounds thereof
• C22B 9/10 - General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor
• C22B 13/00 - Obtaining lead
• C22B 13/02 - Obtaining lead by dry processes
• C03C 3/102 - Glass compositions containing silica with 40% to 90% silica by weight containing lead