Toyota Jidosha Kabushiki Kaisha

Aichi Steel Works, Ltd.

Toyokin Co., Ltd.

Toyokin Kabushiki Kaisha

Hirohiko Sasamoto

Kazuhiro Suzuki

Yuji Okada

Toshikatsu Hara

Masamichi Okada

Hirokazu Shirakawa

Toshikatu Hara

Process of treating waste containing zinc oxide

A method of treating dust exhausted from a melting furnace in melting an iron-contained material, comprising the steps of: melting the iron-contained material, with air inside the melting furnace shut out from outside air and collecting the dust from the melting furnace into which a gas exhausted from the melting furnace and containing the dust is introduced; performing a lead-collecting process of collecting water, chloride, fluorine, and lead by heating the exhausted dust in vacuum; and performing a zinc-collecting process of collecting metallic zinc contained in the dust by heating a residue of the exhausted dust in vacuum.

Method of treating dust exhausted from melting furnace

Dusts containing zinc and/or lead in the form of oxides and one or more reducing agents are mixed with each other before or after being introduced into a heat treatment furnace. The mixture is heated to a given temperature range under a substantial vacuum so that the zinc and/or lead in the form of oxides are reduced to zinc and/or lead in the state of pure metals and evaporated in the furnace. The evaporated zinc and/or lead are introduced into a retrieving container also under a substantial vacuum and at a given temperature where the evaporated zinc and/or lead pure metals are condensed and retrieved.

Method of treating dusts containing oxides

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Aichi-ken, Japan

Hirohiko Sasamoto